CN101557466B

CN101557466B - Zoom lens and image pickup apparatus with same

Info

Publication number: CN101557466B
Application number: CN2009101299594A
Authority: CN
Inventors: 片仓正弘; 河村一辉
Original assignee: Olympus Imaging Corp
Current assignee: Olympus Corp
Priority date: 2008-04-11
Filing date: 2009-04-10
Publication date: 2013-03-27
Anticipated expiration: 2029-04-10
Also published as: JP2009258174A; CN101557466A; JP5484687B2

Abstract

The invention provides a zoom lens and an image pickup apparatus with same. The apparatus comprises a zoom lens and an image pickup element distributed on an image side of the zoom lens and convertingan optical image formed by the zoom lens into an electric signal. The zoom lens comprises: sequentially from an object side to the image side, a first negative lens unit, a second negative lens unit, a third positive lens unit and a fourth negative lens unit. During the zoom period from a wide angle end to a telephoto end, the distance between the first and second lens units changes, the distance between the second and third lens units changes, and the distance between the third and fourth lens units changes. The distance between the second and third lens units on the telephoto end is smaller than that on the wide angle end. The first lens unit comprises a reflection surface for deflecting light paths, and the zoom lens satisfies the following condition:-100<fg4/ihw<-2.5.

Description

Zoom lens and the image pick-up device that is equipped with these zoom lens

Technical field

The present invention relates to have the zoom lens of the reflecting surface that makes optical path-deflecting.The invention still further relates to the image pick-up device that is equipped with this zoom lens and image pick-up element.

Background technology

The zoom lens that require to be used for image pick-up device (for example digital camera and video camera) have high-performance and high zoom ratios and are made less.One of key factor that realizes the image pick-up device size reduction is the thickness (that is the size of the lens combination of, measuring from the thing side along the direction of principal axis that is incident on the light on the lens combination) of zoom lens.

In the zoom lens of known type, in order to reduce image pick-up device or the video camera thickness when not using, (when device is opened) lens combination is stretched out from the video camera fuselage when using, and (namely when device is closed) included in the video camera fuselage when not in use.

Yet in the type zoom lens, the first lens unit stretches out much from the fuselage of image pick-up device when device is opened from being closed to.In that this is disadvantageous aspect driving time and the power consumption.

On the other hand, there are a kind of known zoom lens, wherein in the first lens unit that the most close thing side is arranged, are provided with reflecting element so that optical path-deflecting, in order to reduce when image pick-up device performed operation and attenuation of implement device during in unlatching.

For example, as disclosed in TOHKEMY 2006-343622 communique, there are a kind of known zoom lens, it comprises first lens unit, the second lens unit with negative refraction power with positive refracting power, the 4th lens unit that has the 3rd lens unit of positive refracting power and have positive refracting power, wherein in the first lens unit, be provided with the reflecting element that makes optical path-deflecting, to realize that image pick-up device in the attenuation of thickness direction, keeps zoom ratio up to being approximately four simultaneously.

For example, as disclosed in TOHKEMY 2006-98962 communique, there are another kind of known zoom lens, it comprises the first lens unit with negative refraction power, the second lens unit with negative refraction power, the 4th lens unit that has the 3rd lens unit of positive refracting power and have negative refraction power, wherein in the first lens unit, be provided with the reflecting element that makes optical path-deflecting, to realize that image pick-up device in the attenuation of thickness direction, keeps zoom ratio up to being approximately three simultaneously.

Yet disclosed zoom lens have long optical path length in the TOHKEMY 2006-343622 communique after the deflection at reflecting element place.Therefore, if light path at the short transverse upper deflecting of image pick-up device, will cause the height of image pick-up device to increase.

In addition, very large to the distance that enters Pupil from the thing side surface of zoom lens if be in the situation of positive lens unit at the lens unit of the most close thing side, especially true in wide-angle side.If the acquisition wide visual field angle, must be so that the thickness of the reflecting element in the first lens unit be very large.

In the disclosed zoom lens, very large in wide-angle side from the incident angle of axle chief ray on the picture plane in TOHKEMY 2006-98962 communique.Therefore, because the shade (perhaps brightness decline) that causes owing to large incident angle may appear in the characteristic of image pick-up element.

In addition, the 4th lens unit has too high negative refraction power.This is so that be difficult in the structure that realizes simplifying when aberration reduces this lens unit.

Summary of the invention

Make in view of the above problems the present invention, and an object of the present invention is to provide a kind of zoom lens, these zoom lens are conducive to so that zoom lens miniaturization and realize needed zoom ratio and optical property.

Another object of the present invention provides the image pick-up device that is equipped with this zoom lens.

Image pick-up device according to first aspect present invention comprises from its thing side in order:

Zoom lens; With

Image pick-up element, it is converted to the signal of telecommunication with the optical image that zoom lens form, wherein

Zoom lens comprise from the thing side in order: have negative refraction power the first lens unit, have the second lens unit of negative refraction power, the 4th lens unit that has the 3rd lens unit of positive refracting power and have negative refraction power,

During from wide-angle side to the zoom of taking the photograph far-end, distance between first lens unit and the second lens unit changes, distance between the second lens unit and the 3rd lens unit changes, and the distance between the 3rd lens unit and the 4th lens unit changes, distance between the second lens unit and the 3rd lens unit is being taken the photograph far-end less than in wide-angle side, and

The first lens unit comprises the reflecting surface that makes optical path-deflecting, and zoom lens meet the following conditions (1):

-100＜fg4/ihw＜-2.5 (1)

Wherein fg4 is the focal length of the 4th lens unit, and ihw is the maximum image height degree in wide-angle side, and wherein, if the effective image picking region of image pick-up element is variable, then ihw is the maximum in its value that can take.

Zoom lens according to second aspect present invention comprise from its thing side in order: have negative refraction power the first lens unit, have the second lens unit of negative refraction power, the 4th lens unit that has the 3rd lens unit of positive refracting power and have negative refraction power, wherein

The first lens unit comprises: make optical path-deflecting reflecting surface, be arranged in the lens element with negative refraction power on the thing side of this reflecting surface and be arranged in this negative lens element as the convex surface with positive refracting power on the side.

Description of drawings

Figure 1A, 1B and 1C be according to the zoom lens of first embodiment of the invention therein zoom lens respectively in wide-angle side (Figure 1A), at middle focal length state (Figure 1B) with taking the photograph profile under the state on the object point that far-end (Fig. 1 C) focuses on infinite point;

Fig. 2 A, 2B and 2C are the profiles according to the zoom lens of second embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 3 A, 3B and 3C are the profiles according to the zoom lens of third embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 4 A, 4B and 4C are the profiles according to the zoom lens of four embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 5 A, 5B and 5C are the profiles according to the zoom lens of fifth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 6 A, 6B and 6C are the profiles according to the zoom lens of sixth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 7 A, 7B and 7C are the profiles according to the zoom lens of seventh embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 8 A, 8B and 8C are the profiles according to the zoom lens of eighth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Fig. 9 A, 9B and 9C are the profiles according to the zoom lens of ninth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 10 A, 10B and 10C are the profiles according to the zoom lens of tenth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 11 A, 11B and 11C are the profiles according to the zoom lens of eleventh embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 12 A, 12B and 12C are the profiles according to the zoom lens of twelveth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 13 A, 13B and 13C are the profiles according to the zoom lens of thirteenth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 14 A, 14B and 14C are the profiles according to the zoom lens of fourteenth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 15 A, 15B and 15C are the profiles according to the zoom lens of fifteenth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 16 A, 16B and 16C are the profiles according to the zoom lens of sixteenth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 17 A, 17B and 17C are the profiles according to the zoom lens of seventeenth embodiment of the invention of illustrating that is similar to Figure 1A, 1B and 1C;

Figure 18 A, 18B and 18C be illustrate according to the zoom lens of the first execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 18 A shows the aberration of wide-angle side, Figure 18 B shows the aberration of middle focal length position, and Figure 18 C shows the aberration of taking the photograph far-end;

Figure 19 A, 19B and 19C be illustrate according to the zoom lens of the second execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 19 A shows the aberration of wide-angle side, Figure 19 B shows the aberration of middle focal length position, and Figure 19 C shows the aberration of taking the photograph far-end;

Figure 20 A, 20B and 20C be illustrate according to the zoom lens of the 3rd execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 20 A shows the aberration of wide-angle side, Figure 20 B shows the aberration of middle focal length position, and Figure 20 C shows the aberration of taking the photograph far-end;

Figure 21 A, 21B and 21C be illustrate according to the zoom lens of the 4th execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 21 A shows the aberration of wide-angle side, Figure 21 B shows the aberration of middle focal length position, and Figure 21 C shows the aberration of taking the photograph far-end;

Figure 22 A, 22B and 22C be illustrate according to the zoom lens of the 5th execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 22 A shows the aberration of wide-angle side, Figure 22 B shows the aberration of middle focal length position, and Figure 22 C shows the aberration of taking the photograph far-end;

Figure 23 A, 23B and 23C be illustrate according to the zoom lens of the 6th execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 23 A shows the aberration of wide-angle side, Figure 23 B shows the aberration of middle focal length position, and Figure 23 C shows the aberration of taking the photograph far-end;

Figure 24 A, 24B and 24C be illustrate according to the zoom lens of the 7th execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 24 A shows the aberration of wide-angle side, Figure 24 B shows the aberration of middle focal length position, and Figure 24 C shows the aberration of taking the photograph far-end;

Figure 25 A, 25B and 25C be illustrate according to the zoom lens of the 8th execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 25 A shows the aberration of wide-angle side, Figure 25 B shows the aberration of middle focal length position, and Figure 25 C shows the aberration of taking the photograph far-end;

Figure 26 A, 26B and 26C be illustrate according to the zoom lens of the 9th execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 26 A shows the aberration of wide-angle side, Figure 26 B shows the aberration of middle focal length position, and Figure 26 C shows the aberration of taking the photograph far-end;

Figure 27 A, 27B and 27C be illustrate according to the zoom lens of the tenth execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 27 A shows the aberration of wide-angle side, Figure 27 B shows the aberration of middle focal length position, and Figure 27 C shows the aberration of taking the photograph far-end;

Figure 28 A, 28B and 28C be illustrate according to the zoom lens of the 11 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 28 A shows the aberration of wide-angle side, Figure 28 B shows the aberration of middle focal length position, and Figure 28 C shows the aberration of taking the photograph far-end;

Figure 29 A, 29B and 29C be illustrate according to the zoom lens of the 12 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 29 A shows the aberration of wide-angle side, Figure 29 B shows the aberration of middle focal length position, and Figure 29 C shows the aberration of taking the photograph far-end;

Figure 30 A, 30B and 30C be illustrate according to the zoom lens of the 13 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 30 A shows the aberration of wide-angle side, Figure 30 B shows the aberration of middle focal length position, and Figure 30 C shows the aberration of taking the photograph far-end;

Figure 31 A, 31B and 31C be illustrate according to the zoom lens of the 14 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 31 A shows the aberration of wide-angle side, Figure 31 B shows the aberration of middle focal length position, and Figure 31 C shows the aberration of taking the photograph far-end;

Figure 32 A, 32B and 32C be illustrate according to the zoom lens of the 15 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 32 A shows the aberration of wide-angle side, Figure 32 B shows the aberration of middle focal length position, and Figure 32 C shows the aberration of taking the photograph far-end;

Figure 33 A, 33B and 33C be illustrate according to the zoom lens of the 16 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 33 A shows the aberration of wide-angle side, Figure 33 B shows the aberration of middle focal length position, and Figure 33 C shows the aberration of taking the photograph far-end;

Figure 34 A, 34B and 34C be illustrate according to the zoom lens of the 17 execution mode therein zoom lens focus on the figure of spherical aberration, astigmatism, distortion and the chromatic aberation of the convergent-divergent multiplying power under the state on the object point of infinite point, wherein Figure 34 A shows the aberration of wide-angle side, Figure 34 B shows the aberration of middle focal length position, and Figure 34 C shows the aberration of taking the photograph far-end;

Figure 35 is the figure that distortion correction is shown;

Figure 36 illustrates the isometric front view that is equipped with according to the outward appearance of the digital camera of the zoom lens with deflection optical path of the present invention;

Figure 37 is the rear isometric view of digital camera;

Figure 38 is the profile of digital camera;

Figure 39 is the block diagram of internal circuit of the major part of digital camera; And

Figure 40 A, 40B and 40C illustrate respectively to be equipped with cellular front view, end view and the profile that has the zoom lens of deflection optical path according to of the present invention.

Embodiment

According to the image pick-up device of first aspect present invention have zoom lens and be arranged in zoom lens as on the side and the optical image that zoom lens form is converted to the image pick-up element of the signal of telecommunication.Zoom lens are from its thing side to comprising in order as side: the first lens unit with negative refraction power, the second lens unit with negative refraction power, the 3rd lens unit with positive refracting power, with the 4th lens unit with negative refraction power, wherein during from wide-angle side to the zoom of taking the photograph far-end, distance between first lens unit and the second lens unit changes, distance between the second lens unit and the 3rd lens unit changes, distance between the 3rd lens unit and the 4th lens unit changes, and the distance between the second lens unit and the 3rd lens unit is being taken the photograph far-end less than in wide-angle side.

In addition, the first lens unit has the reflecting surface that makes optical path-deflecting, and the 4th lens unit meets the following conditions:

-100＜fg4/ihw＜-2.5 (1)

Wherein fg4 is the focal length of the 4th lens unit, and ihw is the maximum image height degree in wide-angle side, if wherein the effective image picking region of image pick-up element is variable, then ihw is the maximum in its value that can take.

By first lens unit and the second lens unit are designed to all have negative refraction power, be provided at that wide-angle side has the first lens unit of enough negative refraction power and the synthesis system of the second lens unit becomes easy.This is conducive to obtain enough angles of visual field, the reduction optical path length of wide-angle side and reduces shade.In addition, be to have negative refraction power to be conducive to prevent that the second lens unit has too high negative refraction power with the first lens Unit Design, this aberration that then is conducive to reduce during the zoom changes.

Changing the distance have the second lens unit of negative refraction power and to have between the 3rd lens unit of positive refracting power is conducive to so that the major part that the 3rd lens unit provides the convergent-divergent multiplying power to change.Each distance that changes between the first, second, third and the 4th lens unit makes it possible to control the variation of pupil location and aberration, and is conducive to regulate the image position.

Provide the 4th lens unit with negative refraction power at the 3rd lens unit with positive refracting power as side.Therefore, all be furnished with the lens unit with negative refraction power in the thing side of the 3rd lens unit with positive refracting power with on as side.This has realized the good symmetry that refracting power is arranged.As a result, can prevent easily that distortion and visual field bending from becoming excessive.

In lens unit according to the present invention, in the first lens unit, has as mentioned above the thickness (that is the size of the lens combination of, measuring from the thing side along the direction of principal axis that incides the light on the lens combination) that reflecting surface is conducive to reduce zoom lens.

In addition, the 4th lens unit satisfies above-mentioned conditional expression (1).

The preferred value of the ratio of the negative focal length of conditional expression (1) appointment the 4th lens unit and the image height degree of wide-angle side.

The 4th lens unit has the function that the Off-axis-light that will send from the 3rd lens unit with positive refracting power reflects along the direction away from optical axis.The size of negative refraction power that therefore, can be by controlling the 4th lens unit is come the size of regulating the second and the 3rd lens unit with respect to the size on picture plane.

Introduce conditional expression (1) and realize the size reduction of lens combination, and the image of good quality is provided.

So that the 4th lens unit has enough negative refraction power, then be not conducive to reduce the second and the 3rd lens unit with respect to the size of image height degree if surpass the lower limit of conditional expression (1).If the 4th lens unit has enough negative refraction power, then can realize the good symmetry that the refracting power in the whole zoom lens is arranged.It is crooked and distortion is excessive that this is conducive to suppress the visual field.

So that the negative refraction power of the 4th lens unit is moderately little, then the angle from axle chief ray and optical axis formation of sending from the 4th lens unit can be reduced to appropriate scope if do not surpass the upper limit of conditional expression (1).Therefore, this is conducive to so that the impact of and minimizing shade less from the incident angle of axle chief ray on image pick-up element.

In addition, be conducive to reduce the aberration that produces in the 4th lens unit, this causes other benefit, for example, even the 4th lens unit is comprised of single lens, also can reduce the variation of off-axis aberration during the zoom.

In order to obtain above-mentioned advantageous effects, more preferably, meet the following conditions:

-40＜fg4/ihw＜-4.5 (1’)，

And more preferably, meet the following conditions:

-15＜fg4/ihw＜-6.0 (1”)。

The upper limit and/or the lower limit that can replace respectively primary condition expression formula (1) by the upper limit and/or the lower limit of more limited conditional expression (1 ') or (1 ").This also is applicable to other conditional expressions that will provide below.

Term " effective image picking region " is illustrated in the zone of the picture that forms on the optical receiving surface of image pick-up element, has wherein provided the image that will be used for demonstration and/or print.

Have with the image transitions in the barrel-shaped zone on the image pick-up element for the image information of expression rectangular image to be used for showing and/or print in order to proofread and correct electronically zoom lens in the situation of the image pick-up device of the function of the barrel-shaped distortion of wide-angle side that in wide-angle side the effective image picking region has barrel-shaped.

Can change when captured image therein in the situation of the image pick-up device (for example having the image pick-up device that changes the function of aspect ratio by user intention) in the effective image picking region of wide-angle side, the effective image picking region will be the image pickup zone with maximum image height degree.

The example of image pick-up device can comprise digital camera, be equipped with the cell phone of video camera and be equipped with video camera with notebook of carrying out video communication etc.

Preferably, in said apparatus according to the present invention, additionally adopt in the following characteristics any one or some.

Preferably, the 4th lens unit is being taken the photograph the far-end ratio in the more close thing side of wide-angle side, and meets the following conditions:

1.01＜βg4(t)/βg4(w)＜2.0 (2)

Wherein, β g4 (w) be the 4th lens unit in the horizontal convergent-divergent multiplying power of wide-angle side, and β g4 (t) is that the 4th lens unit is being taken the photograph the horizontal convergent-divergent multiplying power of far-end.

By moving in the above described manner the 4th lens unit, the 4th lens unit can operate to provide the convergent-divergent multiplying power to change.This makes it possible to reduce the convergent-divergent multiplying power that needs Unit the 3rd to share and changes.This is conducive to obtain good optical property and enough zoom ratios.

Conditional expression (2) has been specified the preferred value of the convergent-divergent multiplying power changing ratio of the 4th lens unit.

Preferably, be no more than the lower limit of conditional expression (2) so that the 4th lens unit provides enough convergent-divergent multiplying powers to change.

Further preferably, be no more than the upper limit of conditional expression (2) so that the convergent-divergent multiplying power that the 4th lens unit provides variation is less, prevent that thus the amount of movement of the 4th lens unit from becoming excessive.So that the size of zoom lens is less and reduce foozle, this is preferred for the variation that reduces off-axis aberration.

1.02＜βg4(t)/βg4(w)＜1.8 (2’)，

And more preferably, meet the following conditions:

1.03＜βg4(t)/βg4(w)＜1.5 (2”)。

Further preferably, the 4th lens unit meets the following conditions:

-0.35＜Dg4/fg4＜-0.0005 (3)

Wherein, Dg4 be the 4th lens unit on optical axis from it the thing side surface to it the picture side surface thickness.

Conditional expression (3) has been specified the preference relation of the 4th lens unit between the length on the optical axis and its focal length.

Design the reduction that the 4th lens unit is conducive to realize the cost of lens element in the mode of the lower limit that is no more than conditional expression (3).If do not surpass the upper limit of conditional expression (3) so that the 4th lens unit has suitable thickness, then be conducive to the refraction of Off-axis-light, and do not have the abnomal loss of durability.

In order to obtain above-mentioned effect, more preferably, meet the following conditions:

-0.3＜Dg4/fg4＜-0.005 (3’)，

And more preferably, meet the following conditions:

-0.2＜Dg4/fg4＜-0.01 (3”)。

Preferably, zoom lens meet the following conditions:

0.5＜enp(W)/fw＜1.8 (4)

Wherein, enp (w) be in wide-angle side from the thing side plane of refraction of first lens unit to entering the distance of Pupil on optical axis, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

In zoom lens according to the present invention, wherein the lens unit of the most close thing side has reflecting surface, and the thickness of zoom lens depends on from the surface of the most close thing side of first lens unit to a great extent to the distance of reflecting surface.

For so that this distance is less, preferably, enter Pupil and be positioned as close to the thing side, and so that the light height in the first lens unit is less.

Yet, in order to make the more close thing side into Pupil, need to increase the negative refraction power of the second lens unit, perhaps make the more close thing side of principal point of the second lens unit.This has affected aberration characteristic widely.Therefore, preferably, suitably control the exit pupil position to obtain well balanced between size reduction and the optical property.

Conditional expression (4) has been described the optimum condition that is used for this point.

If do not surpass the lower limit of conditional expression (4), then can be easily so that aberration balance well.

If do not surpass the upper limit of conditional expression (4), then further be conducive to the attenuation of image pick-up device.

More preferably, meet the following conditions:

0.7＜enp(W)/fw＜1.5 (4’)，

And more preferably, meet the following conditions:

1.0＜enp(W)/fw＜1.3 (4”)。

Further preferably, first lens unit and the 4th lens unit meet the following conditions:

0.001＜fg4/fg1＜30.0 (5)

Wherein fg1 is the focal length of first lens unit.

Conditional expression (5) has been specified the preferred value of ratio of the focal length of the focal length of first lens unit and the 4th lens unit.

If do not surpass lower limit and the upper limit of conditional expression (5), then further increased the symmetrical degree of the refracting power layout of first lens unit and the 4th lens unit.Therefore, can further reduce aberration, for example distortion and visual field are crooked, and can be easily so that aberration and off-axis aberration balance well on the axle.

More preferably, meet the following conditions:

0.01＜fg4/fg1＜5.0 (5’)，

And more preferably, meet the following conditions:

0.3＜fg4/fg1＜1.3 (5”)。

Further preferably, the first lens unit comprise have reflecting surface, the reflecting prism of thing side plane of refraction and picture side plane of refraction, and the reflecting surface that makes optical path-deflecting in the zoom lens add up to one.

If reflecting element add up to one, can prevent that then zoom lens have unnecessary large entire length.Use prism to be conducive to guarantee at lower cost enough optical path lengths as reflecting element.

Further preferably, the first lens unit comprise have reflecting surface, the reflecting prism of thing side plane of refraction and picture side plane of refraction, and reflecting prism meets the following conditions:

0.5＜Dpr/fw＜2.0 (6)

Wherein Dpr be thing side plane of refraction along optical axis from reflecting prism to its optical path length as the side plane of refraction, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

Conditional expression (6) has been described in the situation that the prism that makes optical axis deflection is provided in the first lens unit, arranges the optimum condition of prism in the first lens unit with being used for having no problem.

If do not surpass the lower limit of conditional expression (6), can be to have enough optical path lengths with prism design easily then.

If do not surpass the upper limit of conditional expression (6), then be conducive to reduce the size of prism.

More preferably, meet the following conditions:

0.7＜Dp/fw＜1.5 (6’)，

And more preferably, meet the following conditions:

0.8＜Dp/fw＜1.3 (6”)。

1.70＜nd(pr)＜2.3 (10)

Wherein nd (pr) is that reflecting prism in the first lens unit is to the refractive index of d line.

Conditional expression (10) has been specified the preferred value of the refractive index of the reflecting prism in the first lens unit.Design zoom lens in the such mode of the expression formula that satisfies condition (10) and be conducive to the optical path length that provides enough, and do not have the unnecessary increase of cost.

If do not surpass the lower limit of conditional expression (10) so that reflecting prism has suitable refractive index, then need not to use large reflecting prism can obtain enough optical path lengths.

If do not surpass the upper limit of conditional expression (10), then be conducive to reduce the cost of reflecting prism.

1.80＜nd(pr)＜2.1 (10’)，

And more preferably, meet the following conditions:

1.88＜nd(pr)＜2.0 (10”)。

Further preferably, during from wide-angle side to the zoom of taking the photograph far-end, it is fixing that the first lens unit keeps, and the second lens unit moves, and the 3rd lens unit moves than the mode in the more close thing side of wide-angle side taking the photograph far-end with it.

This is not so that need for the mechanism that drives the first lens unit, and therefore is conducive to make the zoom lens attenuation.This is conducive to so that the image pick-up device dust and water protection in addition.

In addition, the second lens unit that has negative refraction power can be used as compensator.In addition, the 3rd lens unit that has a positive refracting power can be used as variator (variator).This is conducive to obtain sufficiently high zoom ratio and reduces optical path length.

Further preferably, during from wide-angle side to the zoom of taking the photograph far-end, the second lens unit is at first towards the picture side shifting, and its moving direction of reversing thereafter is with towards the thing side shifting.

This is conducive to reduce the optical path length after reflecting surface, provides enough convergent-divergent multiplying powers to change by mobile the 3rd lens unit simultaneously.

Preferably, from the object of distant location during the focusing operation of closely object, the 4th lens unit is towards the picture side shifting.

In the zoom lens that in image pick-up device according to the present invention, use, the second lens unit and the 4th lens unit can be designed to be used as the condenser lens unit.

By being than the more close picture side of reflecting surface with the condenser lens cell layout, eliminated the varied in thickness of zoom lens during focusing on, this is conducive to so that the zoom lens attenuation.

Mobile the 4th lens unit is preferred to focus on than mobile the second lens unit, because can more easily be provided for the space of mobile lens unit during focusing on.

Further preferably, the 3rd lens unit is comprised of two positive element and a negative lens element, and in these lens elements at least two are bonded together.

In the 3rd lens unit, have and have two positive element and negative lens element in the situation of at least one composition surface and make it possible to well chromatic aberation and spherical aberration on the axis calibration, particularly taking the photograph far-end.Use is no more than three lens elements and is conducive to Cost reduction.Use nearly three lens elements is conducive to reduce spherical aberration, is particularly taking the photograph far-end.

Further preferably, the second lens unit is comprised of two lens elements, comprises negative lens element and positive element by the order from the thing side, and negative lens element and positive element are bonded together.

The second lens unit forms by engaging lens, described joint lens are comprised of negative lens element and the positive element of arranged in sequence from the thing side, use the second such lens unit to be conducive to obtain well-corrected to the chromatic aberation of convergent-divergent multiplying power, particularly in wide-angle side.

Further preferably, the 4th lens unit is comprised of two or still less lens element.

This is conducive to Cost reduction.By forming the minimizing that the 4th lens unit further is conducive to cost by a negative lens element.

Further preferably, the negative lens that the 4th lens unit has is the most close picture side in the 4th lens unit, and meets the following conditions:

1.4＜nd(g4i)＜1.7 (7)

55.0＜vd(g4i)＜100 (8)

Wherein nd (g4i) be the lens of the most close picture side in the 4th lens unit to the refractive index of d line, and vd (g4i) is the Abbe number of the lens of the most close picture side in the 4th lens unit.

The refractive index of lens of the most close picture side in the 4th lens unit and the preferred value of Abbe number have been specified respectively in conditional expression (7) and (8).

In the zoom lens that the image pick-up device according to first aspect present invention uses, use the lens with negative refraction power to be conducive to reduce the size of zoom lens as the most close lens as side in the 4th lens unit.Preferably, this negative lens is by low chromatic dispersion material manufacturing.

The satisfy condition negative lens of expression formula (8) of use is particularly conducive to the chromatic aberation that reduces the convergent-divergent multiplying power.

If use low dispersion negative lens so that do not surpass the lower limit of conditional expression (8), then be conducive to reduce the chromatic aberation of convergent-divergent multiplying power.If do not surpass the upper limit of conditional expression (8), then be conducive to reduce the cost of lens material.

If do not surpass the lower limit of conditional expression (7), even then negative lens curvature less also can easily have enough refracting powers.This is conducive to reduce off-axis aberration.If do not surpass the upper limit of conditional expression (7), then be conducive to reduce the cost of the more low dispersion material of the expression formula (8) that satisfies condition.

Further preferably, the zoom lens that in the device according to first aspect present invention, use be the second lens unit as side surface and the 3rd lens unit as side surface between be furnished with four unit zoom lens of aperture diaphragm.

Four unit zoom lens structures are conducive to realize cost, use simultaneously the lens unit of limited quantity so that the size of zoom lens is less.

In this case, be arranged between the picture side surface as side surface and the 3rd lens unit of the second lens unit if determine the aperture diaphragm of the size of light beam on the axle, then can easily control satisfactorily the size of each lens unit and the position of emergent pupil.

Further preferably, the zoom lens that use among the present invention meet the following conditions:

1.8＜ft/fw＜6.5 (9)

Wherein fw be whole zoom-lens system at the focal length of wide-angle side, and ft is that whole zoom-lens system is being taken the photograph the focal length of far-end.

Preferably, do not surpass the lower limit of conditional expression (9) so that zoom lens have enough zoom ratios.

The zoom ratio of restriction zoom lens is conducive to further reduced in size and cost so that do not surpass the upper limit of conditional expression (9), and keeps good optical property, prevents simultaneously the increase of lens numbers.

Further preferably, be equipped with image transitions section according to the image pick-up device of first aspect present invention, this image transitions section processes the signal of telecommunication that expression is comprised the image of the distortion that zoom lens cause by image and is converted to the picture signal of wherein having proofreaied and correct distortion.

In this case, allow in the picture that zoom lens form, to leave distortion.This further is conducive to reduce the size of zoom lens.

More preferably, image pick-up device according to the present invention is equipped with image transitions section, and this image transitions section processes the signal of telecommunication will comprise the convergent-divergent multiplying power chromatic aberation that zoom lens cause by image and is converted to the picture signal of wherein having proofreaied and correct convergent-divergent multiplying power chromatic aberation.

In this case, allow in the picture that zoom lens form, to leave convergent-divergent multiplying power chromatic aberation.This is conducive to reduce the quantity of cost and the lens of lens material.

More preferably, adopt simultaneously in the above-mentioned feature two or more.

Have at zoom lens in the situation of focusing function, the conditional expression that the above provides is used for the state on the object that zoom lens wherein focus on the maximum distance place.

More preferably, satisfy simultaneously some conditions in can optional a plurality of conditions.In the preferred number range restriction of each conditional expression, only can use according to higher limit or only according to the restriction of lower limit.In addition, can adopt above-mentioned various feature by any possible combination.

Zoom lens according to second aspect present invention comprise from the object side to image side in order: the first lens unit with negative refraction power, the second lens unit with negative refraction power, the 3rd lens unit with positive refracting power, with the 4th lens unit with negative refraction power, wherein during from wide-angle side to the zoom of taking the photograph far-end, distance between first lens unit and the second lens unit changes, distance between the second lens unit and the 3rd lens unit changes, distance between the 3rd lens unit and the 4th lens unit changes, and the distance between the second lens unit and the 3rd lens unit is being taken the photograph far-end less than in wide-angle side.

In addition, the first lens unit has the reflecting surface that makes optical path-deflecting, the negative lens element with negative refraction power of the thing side that is arranged in reflecting surface and be arranged in the convex lens with positive refracting power as side of negative lens element.In this context, the lenticular unit that term " lens element " is expressed as follows: it only comprises two surfaces with the surface of contact with air on optical axis, and a surface is that thing side surface and another surface are the picture side surfaces.Lens element can be to be single lens or to engage lens.

By first lens unit and the second lens unit are designed to all have negative refraction power, be provided at that wide-angle side has the first lens unit of enough negative refraction power and the synthesis system of the second lens unit becomes easy.This is conducive to obtain enough angles of visual field, reduce optical path length and reduce shade in wide-angle side.In addition, be to have negative refraction power to be conducive to prevent that the second lens unit has too high negative refraction power with the first lens Unit Design, this aberration that then is conducive to reduce during the zoom changes.

The 4th lens unit that has negative refraction power as the side setting at the 3rd lens unit with positive refracting power.Therefore, all be furnished with the lens unit that has separately negative refraction power in the thing side of the 3rd lens unit with positive refracting power with as side.This has realized the good symmetry that refracting power is arranged.As a result, can prevent easily that distortion and visual field bending from becoming excessive.

In the zoom lens according to second aspect present invention, in the first lens unit, have as mentioned above reflecting surface and be conducive to reduce the thickness (that is the size of the lens combination of, measuring from the thing side along the direction of principal axis that incides the light on the lens combination) of zoom lens.

In addition, the thing side at reflecting surface is provided with negative lens element.This negative lens element provides a plurality of refraction effects.This is conducive to obtain enough large visual angle, suppresses simultaneously aberration.

Provide than the more close convex lens as side of this negative lens element and be conducive to eliminate the aberration that negative lens element can not be proofreaied and correct, for example chromatic aberation and spherical aberration.This is conducive to obtain good optical property.

Preferably, satisfy about between first lens unit and the second lens unit to the following condition of sharing of negative refraction power:

0.5＜Pg2/Pg1＜20 (19)

Wherein Pg1 is the refracting power of first lens unit, and Pg2 is the refracting power of the second lens unit, and refracting power is the inverse of focal length.

Conditional expression (19) has been specified the mode of preferably sharing to negative refraction power between first lens unit and the second lens unit.

If do not surpass the lower limit of conditional expression (19) so that the negative refraction power of first lens unit is moderately little, then be conducive to reduce near the zoom position the wide-angle side and the spherical aberration taking the photograph near the convergent-divergent multiplying power chromatic aberation of the zoom position the far-end and taking the photograph near the zoom position the far-end.

If do not surpass the upper limit of conditional expression (19) so that the negative refraction power of the second lens unit is moderately little, then be conducive to reduce spherical aberration crooked near the visual field of the zoom position the wide-angle side and that taking the photograph near the zoom position the far-end.

1.0＜Pg2/Pg1＜10.0 (19’)，

And more preferably, meet the following conditions:

2.0＜Pg2/Pg1＜7.0 (19”)。

The upper limit of primary condition expression formula (19) and/or lower limit can be respectively replace with the upper limit and/or the lower limit of more limited conditional expression (19 ') or (19 ").Other conditional expressions that this also is applicable to provide below.

Further preferably, the negative lens element in the first lens unit has concave surface towards the shape of picture side.This is conducive to reduce the incident angle of Off-axis-light on this concave surface, and this is conducive to reduce aberration.

In addition, more preferably, the recessed of the negative lens element of first lens unit is aspheric surface as the side.

Except other effects, so that the recessed of the negative lens element in the first lens unit is that aspheric surface especially makes it possible to proofread and correct well off-axis aberration as side surface.

Preferably, above-mentioned negative lens element meets the following conditions:

0.5＜(rlno+rlni)/(rlno-rlni)＜2 (14)

Wherein rlno is the paraxial radius of curvature of the thing side surface of the negative lens element in the first lens unit, and rlni is the paraxial radius of curvature of the picture side surface of the negative lens element in the first lens unit.

If the thing side at reflecting surface arranges a plurality of negative lens elements, then preferably, top condition is applicable to the negative lens element of the most close thing side, and the height of incident ray is larger on this negative lens element.

Conditional expression (14) has been specified the preferable shape of the negative lens element in the first lens unit.

If do not surpass the lower limit of conditional expression (14), then be conducive to reduce the incident angle of light on negative lens element, this is conducive to reduce off-axis aberration, for example distortion.

If do not surpass the upper limit of conditional expression (14), then can be so that the curvature of the thing side surface of negative lens element and picture side surface be less, this is conducive to reduce spherical aberration and coma.

0.7＜(rlno+rlni)/(rlno-rlni)＜1.5 (14’)，

And more preferably, meet the following conditions:

0.9＜(rlno+rlni)/(rlno-rlni)＜1.2 (14”)。

Preferably, in the first lens unit, aforementioned convex lens is than the more close picture side of reflection line position.

Arrange by this, enough optical path lengths can be provided between negative lens element and convex lens, and can be so that the height from the axle rim ray in the first lens unit is lower.Therefore, this is conducive to reduce effective diameter, and this is conducive to so that the zoom lens attenuation.In addition, negative lens element and convex lens can be used as a kind of wide convertible lens, and this is conducive to obtain the enough wide angle of visual field.

In addition, preferably, the first lens unit be included in reflecting surface as the positive element that is furnished with aforementioned convex lens on the side.

This is conducive to reduce by a plurality of planes of refraction of positive element the aberration of first lens unit.

In addition, more preferably, the positive element in the first lens unit meets the following conditions:

-1.0＜(rlpo+rlpi)/(rlpo-rlpi)＜1.0 (15)

Wherein rlpo is the paraxial radius of curvature of the thing side surface of the positive element in the first lens unit, and rlpi is the paraxial radius of curvature of the picture side surface of the positive element in the first lens unit.

If reflecting surface as side a plurality of positive element are set, then preferably, top condition is applicable to the positive element of the most close picture side in the first lens unit, the light height of chief ray is very large on its axis.

Conditional expression (15) has been specified the preferable shape of the positive element in the first lens unit.

Do not surpass its upper limit if both surpass the lower limit of conditional expression (15) yet, then prevented the thing side surface of positive element or become very large as the absolute value of the curvature of side surface.This is conducive to correcting spherical aberration and coma.

0.0＜(rlpo+rlpi)/(rlpo-rlpi)＜0.8 (15’)，

And more preferably, meet the following conditions:

0.2＜(rlpo+rlpi)/(rlpo-rlpi)＜0.5 (15”)。

Further preferably, the positive element in the first lens unit meets the following conditions:

-20.0＜P1p/Pg1＜-0.5 (16)

Wherein P1p is the refracting power of the positive element in the first lens unit, and Pg1 is the refracting power of first lens unit, and refracting power is the inverse of focal length.

If reflecting surface provide a plurality of positive element as side, then preferably, top condition is applicable to the positive element of the most close picture side in the first lens unit, the light height of chief ray is very large on its axis.

Conditional expression (16) is the optimum condition for the aberration of the negative lens element generation of proofreading and correct the first lens unit.

Preferably, so that the refracting power of positive element is moderately little with respect to the negative refraction power of first lens unit, so that do not surpass the lower limit of conditional expression (16).This is conducive to reduce spherical aberration and the visual field bending that positive element produces.

Preferably, positive element has suitable refracting power so that do not surpass the upper limit of conditional expression (16), with chromatic aberation and spherical aberration on the axle of suitably proofreading and correct thus the negative lens element generation.

In order to reduce the aberration that produces in the first lens unit, preferably, meet the following conditions:

-12.0＜P1p/Pg1＜-1.0 (16’)，

And more preferably, meet the following conditions:

-8.0＜P1p/Pg1＜-3.0 (16”)。

-5.0＜P1p/Pg2＜-0.03 (17)

Wherein P1p is the refracting power of the positive element in the first lens unit, and Pg2 is the refracting power of the second lens unit, and refracting power is the inverse of focal length.

Conditional expression (17) has been specified the preferred value of ratio of the refracting power of the refracting power of the positive element in the first lens unit and the second lens unit.

So that the positive refracting power of first lens unit is suitably little and so that the negative refraction power of the second lens unit is suitably large so that not above the lower limit of conditional expression (7), be conducive to so that enter the more close thing side of Pupil.This is conducive to reduce the size of zoom lens and guarantees to provide fully light in the neighboring area of image.

The lower limit that does not surpass conditional expression (7) so that the refracting power of the second lens unit is suitably little is conducive to reduce in coma and the visual field of taking the photograph near the zoom position the far-end crooked.

-3.0＜P1p/Pg2＜-0.2 (17’)，

And more preferably, meet the following conditions:

-1.5＜P1p/Pg2＜-0.5 (17”)。

Further preferably, the first lens unit is comprised of negative lens element, the reflecting element with above-mentioned reflecting surface and positive element from the thing side in order.

Therefore, the first lens unit can be comprised of three optical elements.This is conducive to reduced in size and obtains superperformance.

In addition, the positive element in the first lens unit meets the following conditions:

0.03＜D1p/fw＜2.0 (11)

Wherein D1p is the thickness of positive element on optical axis in the first lens unit, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

Conditional expression (11) has limited the thickness of the positive element in the first lens unit.

In order to be conducive to aberration correction, preferably, do not surpass the lower limit of conditional expression (11), so that positive element has enough thickness and has enough positive refracting powers at optical axis.

If do not surpass the upper limit of conditional expression (11), then be conducive to reduce optical path length and reduce component costs.

More preferably, meet the following conditions:

0.1＜D1p/fw＜1.0 (11’)，

More preferably, meet the following conditions:

0.15＜D1p/fw＜0.4 (11”)。

In addition, preferably, reflecting element is the reflecting prism with thing side plane of refraction and picture side plane of refraction.

This is conducive to reduce the size of zoom lens, because can be easily so that the size of reflecting surface is less when cremasteric reflex face between negative lens element and positive element.

In addition, preferably, the reflecting prism in the first lens unit meets the following conditions:

0.5＜Dpr/fw＜2.0 (13)

Wherein Dpr be thing side plane of refraction along optical axis from reflecting prism to the optical path length of picture side plane of refraction, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

Conditional expression (13) is the optimum condition that is conducive to the prism of cremasteric reflex light.

Preferably, the lower limit that does not surpass conditional expression (13).If do not surpass lower limit, suitable optical path length then is provided in prism, this is conducive to make prism.

In order to realize reducing of size, preferably, do not surpass the upper limit of conditional expression (13) so that the size of prism is less.

0.7＜Dpr/fw＜1.5 (13’)，

And more preferably, meet the following conditions:

0.8＜Dpr/fw＜1.3 (13”)。

Further preferably, the distance on optical axis meets the following conditions between the negative lens element in the first lens unit and the reflecting prism:

0.03＜Dlnpr/fw＜1.0 (12)

Wherein Dlnpr is the distance on optical axis between negative lens element in the first lens unit and the prism, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

Conditional expression (12) has been specified the preferred value of the distance on optical axis between negative lens element in the first lens unit and the prism.

If provide enough distances so that do not surpass the lower limit of conditional expression (12) between negative lens element and prism, then negative lens element can have enough negative refraction power as side surface.This is conducive to prevent that visual field bending and distortion from becoming excessive.

If do not surpass the upper limit of conditional expression (12), then can be easily so that enter the thing side surface of the more close zoom lens of Pupil.This is conducive to so that the first lens unit is less.

More preferably, meet the following conditions:

0.07＜Dlnpr/fw＜0.6 (12’)，

And more preferably, meet the following conditions:

0.10＜Dlnpr/fw＜0.3 (12”)。

Also more preferably, the negative lens element in the first lens unit is the single lens element, and the positive element in the first lens unit is the single lens element, and the reflecting element in the first lens unit is the reflecting prism with a plurality of planes of refraction.This is conducive to Cost reduction and size.

Further preferably, during from wide-angle side to the zoom of taking the photograph far-end, it is fixing that the first lens unit keeps, and the second lens unit moves, and the 3rd lens unit is to move than the mode in the more close thing side of wide-angle side taking the photograph far-end.

This is not so that need for the mechanism that drives the first lens unit, and therefore is conducive to make the zoom lens attenuation.This is conducive to so that the image pick-up device dust and water protection in addition, because can be so that the quantity of driver part is less.

In addition, the second lens unit with negative refraction power can be used as compensator, and the 3rd lens unit with positive refracting power can be used as variator.This is conducive to obtain sufficiently high zoom ratio and reduces optical path length.

In addition, preferably, during from wide-angle side to the zoom of taking the photograph far-end, the second lens unit is at first towards the picture side shifting, and its moving direction of reversing thereafter is with towards the thing side shifting.

Further preferably, during from wide-angle side to the zoom of taking the photograph far-end, the 4th lens unit is so that the mode that the distance between the 4th lens unit and the 3rd lens unit changes moves.This makes it possible to be provided to the 4th lens unit the function of control aberration and exit pupil position during the zoom.

Further preferably, the distance between the 3rd lens unit and the 4th lens unit is being taken the photograph far-end than larger in wide-angle side.This is so that axle top edge light incides the more close optical axis in position of the 4th lens unit with negative refraction power.This is conducive to proofread and correct Petzval as the plane.

Further preferably, the 4th lens unit is being taken the photograph the far-end ratio in the more close thing side of wide-angle side.Have negative refraction power, when the 4th lens unit take the photograph far-end from it in the position of wide-angle side during towards the thing side shifting, it provides the increase of convergent-divergent multiplying power.This is conducive to reduce the convergent-divergent multiplying power variation that needs the 3rd lens unit is shared.

Further preferably, from the object of distant location during the focusing operation of closely object, be moved than more close any one lens unit with negative refraction power as side of reflecting surface.

In the zoom lens according to second aspect present invention, the second lens unit and the 4th lens unit can be designed to as the condenser lens unit.

Further preferably, the 4th lens unit from the object of distant location during the focusing operation of closely object towards the picture side shifting.

Mobile the 4th lens are preferred to focus on than mobile the second lens unit, because can more easily be provided for the space of mobile lens unit during zoom.

More preferably, be four unit zoom lens according to the zoom lens of second aspect present invention, and the second lens unit as side surface and the 3rd lens unit as side surface between aperture diaphragm is provided.

Four unit zoom lens structures are conducive to realize cost, use simultaneously the lens unit of limited quantity so that the size of Zoom lens unit is less.

Further preferably, the second lens unit is comprised of two lens elements that comprise negative lens element and positive element, the 3rd lens unit is comprised of two positive element and a negative lens element, and the 4th lens unit is comprised of two or still less lens element.

This aberration by reducing the 3rd lens unit wherein concentrated positive refracting power and the chromatic aberation of the second lens unit are conducive to good aberration balancing, simultaneously so that the quantity of lens element still less.

Preferably, the zoom lens according to second aspect present invention meet the following conditions:

2.3＜ft/fw＜6 (18)

Preferably, do not surpass the lower limit of conditional expression (18) so that zoom lens have enough zoom ratios.

The zoom ratio of restriction zoom lens prevents the increase of lens numbers simultaneously so that not surpassing the upper limit of conditional expression (18) further is conducive to reduced in size and cost and keep good optical property.

Preferably, zoom lens according to the present invention have the glare stop (flare stop) in the light path of being arranged in.

Except also having glare stop, aperture diaphragm makes it possible to eliminate the undesired light that may cause mirage phantom, lens flare etc.

Image pick-up device according to the present invention is equipped with according to any one zoom lens in the above-mentioned pattern and is arranged in it is converted to the signal of telecommunication as the optical image that zoom lens are formed of side image pick-up element.

Because the above-mentioned zoom lens according to second aspect present invention are conducive to realize size reduction when being used as the image-pickup optical system of image pick-up element, so it is conducive to reduce size and the weight of image pick-up device.

Further preferably, above-mentioned image pick-up device is equipped with image transitions section, and this image transitions section processes the signal of telecommunication that expression is comprised the image of the distortion that zoom lens cause by image and is converted to the picture signal of wherein having proofreaied and correct distortion.

In this case, allow in the picture that zoom lens form, to leave convergent-divergent multiplying power chromatic aberation.The quantity that this for example is conducive to reduce the cost of lens material and reduces lens.

Have at zoom lens in the situation of focusing function, the conditional expression that the above provides is used for the state on the object that zoom lens wherein focus on maximum distance.

[execution mode]

Below, with reference to the execution mode of accompanying drawing detailed description according to zoom lens of the present invention and image pick-up device.Yet, should be appreciated that to the invention is not restricted to these execution modes.

Below, with the first to the 17 execution mode of describing according to zoom lens of the present invention.Figure 1A, 1B and 1C to 17A, 17B and 17C be the first to the 17 execution mode according to the present invention zoom lens therein zoom lens focus under the state on the object point of infinite point, respectively in wide-angle side (Figure 1A is to 17A), at middle focal length state (Figure 1B is to 17B) with at the profile of taking the photograph far-end (Fig. 1 C is to 17C).At Figure 1A in Figure 17 C, the first lens unit is represented by G1, the second lens unit is represented by G2, aperture diaphragm is represented by S, the 3rd lens unit represents by G3, and the 4th lens unit represents by G4, applied the wave-length coverage restriction coating of blocking or reducing infrared light on it and represented by F with the face parallel-plate that consists of low pass filter, the face parallel-plate that is configured for the protective glass of electronic image pickup device is represented by C, and is represented by I as the plane.Protective glass C can be coated with the laminated coating for the wave-length coverage restriction on its surface.Protective glass C can be designed to have the function of low pass filter.

In each execution mode, aperture diaphragm S and the 3rd lens unit G3 are integrally mobile.All numeric datas given below are used for the state on the object that zoom lens wherein focus on infinite point.In numeric data, size is take mm (millimeter) as unit, and angle is take degree as unit.In all execution modes, carry out focusing by the most close mobile lens unit as side.In other words, by with the 4th lens unit towards the picture side shifting, thereby carry out from the object of the distant location focusing operation towards closely object.To and take the photograph far-end (TE) for wide-angle side (WE), middle focal length state (ST) and provide the zoom data.

Shown in Figure 1A, 1B and 1C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the first execution mode by the order from the thing side.

During from wide-angle side to the zoom of taking the photograph far-end, it is fixing that first lens unit G1 keeps, and the second lens unit G2 is along moving towards the track as the side projection, and the 3rd lens unit G3 is towards the thing side shifting, and the 4th lens unit G4 is towards the thing side shifting.

First lens unit G1 is comprised of optical path-deflecting prism and the biconvex positive lens of concave surface towards the thing side.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens (meniscus lens) of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the thing side surface of the optical path-deflecting prism among the first lens unit G1, two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the biconvex positive lens among the 3rd lens unit G3, and the concave surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of thing side.

As shown in Fig. 2 A, 2B and 2C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the second execution mode by the order from the thing side.

First lens unit G1 is comprised of optical path-deflecting prism and the biconvex positive lens of concave surface towards the thing side.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

As shown in Fig. 3 A, 3B and 3C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 3rd execution mode by the order from the thing side.

From wide-angle side during take the photograph the far-end zoom, it is fixing that first lens unit G1 keeps, the second lens unit G2 is along moving towards the track as the side projection, the 3rd lens unit G3 is towards the thing side shifting, and the 4th lens unit G4 is towards the thing side shifting.

First lens unit G1 is comprised of optical path-deflecting prism and the biconvex positive lens of concave surface towards the thing side.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of towards the negative meniscus lens of thing side biconvex positive lens and concave surface.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

As shown in Fig. 4 A, 4B and 4C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 4th execution mode by the order from the thing side.

First lens unit G1 is comprised of optical path-deflecting prism and the biconvex positive lens of concave surface towards the thing side.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of biconvex positive lens and double-concave negative lens.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the thing side surface of the optical path-deflecting prism among the first lens unit G1, two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the biconvex positive lens among the 3rd lens unit G3, and the thing side surface of the double-concave negative lens among the 4th lens unit G4.

As shown in Fig. 5 A, 5B and 5C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 5th execution mode by the order from the thing side.

First lens unit G1 is comprised of towards the positive concave-convex lens of thing side optical path-deflecting prism and the concave surface of concave surface towards the thing side.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of towards the negative meniscus lens of thing side positive concave-convex lens and the concave surface of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the thing side surface of the optical path-deflecting prism among the first lens unit G1, concave surface among the first lens unit G1 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the double-concave negative lens among the second lens unit G2, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the biconvex positive lens among the 3rd lens unit G3, and the concave surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of thing side.

As shown in Fig. 6 A, 6B and 6C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 6th execution mode by the order from the thing side.

During from wide-angle side to the zoom of taking the photograph far-end, it is fixing that first lens unit G1 keeps, the second lens unit G2 is along moving towards the track as the side projection, and the 3rd lens unit G3 is towards the thing side shifting, and the 4th lens unit G4 is at first towards the thing side shifting and thereafter towards the picture side shifting.

First lens unit G1 is comprised of towards plano-concave negative lens, prism and biconvex positive lens as side concave surface.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the concave surface among the first lens unit G1 towards the picture side the plano-concave negative lens the picture side surface, two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the biconvex positive lens among the 3rd lens unit G3, and the concave surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of thing side.

As shown in Fig. 7 A, 7B and 7C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 7th execution mode by the order from the thing side.

First lens unit G1 is comprised of towards plano-concave negative lens, prism and biconvex positive lens as side concave surface.The second lens unit G2 by convex surface towards forming towards the joint lens that the positive concave-convex lens of thing side forms as the negative meniscus lens of side and by double-concave negative lens and convex surface.The 3rd lens unit G3 is comprised of towards the joint lens that the negative meniscus lens as side forms towards the positive concave-convex lens of thing side and by biconvex positive lens and convex surface convex surface.The 4th lens unit G4 is comprised of towards the negative meniscus lens as side convex surface.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the concave surface among the first lens unit G1 towards the picture side the plano-concave negative lens the picture side surface, two surfaces of the biconvex positive lens among the first lens unit G1, convex surface among the second lens unit G2 is towards the picture side surface of the positive concave-convex lens of thing side, convex surface among the 3rd lens unit G3 is towards two surfaces of the positive concave-convex lens of thing side, and the convex surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of picture side.

As shown in Fig. 8 A, 8B and 8C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 8th execution mode by the order from the thing side.

As shown in Fig. 9 A, 9B and 9C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 9th execution mode by the order from the thing side.

First lens unit G1 is comprised of towards plano-concave negative lens, prism and biconvex positive lens as side concave surface.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that the negative meniscus lens as side forms towards the positive concave-convex lens of thing side and by biconvex positive lens and convex surface convex surface.The 4th lens unit G4 is comprised of towards the negative meniscus lens as side convex surface.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the concave surface among the first lens unit G1 towards the picture side the plano-concave negative lens the picture side surface, two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards two surfaces of the positive concave-convex lens of thing side, and the convex surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of picture side.

As shown in Figure 10 A, 10B and 10C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the tenth execution mode by the order from the thing side.

During from wide-angle side to the zoom of taking the photograph far-end, it is fixing that first lens unit G1 keeps, the second lens unit G2 is along moving towards the track as the side projection, and the 3rd lens unit G3 is towards the thing side shifting, and the 4th lens unit G4 moves along the track towards thing side projection.

First lens unit G1 has plane surface by the plano-concave negative lens, in both sides optical path-deflecting prism and biconvex positive lens form.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below six surfaces are aspheric surfaces: two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the biconvex positive lens among the 3rd lens unit G3, and the concave surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of thing side.

Shown in Figure 11 A, 11B and 11C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 11 execution mode by the order from the thing side.

Shown in Figure 12 A, 12B and 12C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 12 execution mode by the order from the thing side.

Shown in Figure 13 A, 13B and 13C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 13 execution mode by the order from the thing side.

First lens unit G1 has plane surface by the plano-concave negative lens, in both sides optical path-deflecting prism and biconvex positive lens form.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that negative meniscus lens and the biconvex positive lens of thing side forms towards the positive concave-convex lens of thing side and by convex surface convex surface.The 4th lens unit G4 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below seven surfaces are aspheric surfaces: the plano-concave negative lens among the first lens unit G1 the picture side surface, two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, the picture side surface of the biconvex positive lens among the 3rd lens unit G3, and the thing side surface of the double-concave negative lens among the 4th lens unit G4.

As shown in Figure 14 A, 14B and 14C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 14 execution mode by the order from the thing side.

Shown in Figure 15 A, 15B and 15C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 15 execution mode by the order from the thing side.

From wide-angle side during take the photograph the far-end zoom, it is fixing that first lens unit G1 keeps, the second lens unit G2 is along moving towards the track as the side projection, and the 3rd lens unit G3 is towards the thing side shifting, and the 4th lens unit G4 moves along the track towards thing side projection.

First lens unit G1 is comprised of towards prism and the biconvex positive lens as side plano-concave negative lens, convex surface.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that the positive concave-convex lens of thing side forms towards the negative meniscus lens of thing side and convex surface towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below six surfaces are aspheric surfaces: two surfaces of the biconvex positive lens among the first lens unit G1, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, convex surface among the 3rd lens unit G3 is towards the picture side surface of the positive concave-convex lens of thing side, and the concave surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of thing side.

Shown in Figure 16 A, 16B and 16C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 16 execution mode by the order from the thing side.

First lens unit G1 has convex surface by the plano-concave negative lens, in both sides prism and biconvex positive lens form.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that the positive concave-convex lens of thing side forms towards the negative meniscus lens of thing side and convex surface towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens of concave surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Shown in Figure 17 A, 17B and 17C, comprise the first lens unit G1 with negative refraction power, the second lens unit G2, aperture diaphragm S with negative refraction power, the 4th lens unit G4 that has the 3rd lens unit G3 of positive refracting power and have negative refraction power according to the zoom lens of the 17 execution mode by the order from the thing side.

First lens unit G1 is comprised of plano-concave negative lens and the prism that has convex surface in both sides.The second lens unit G2 is comprised of the joint lens that double-concave negative lens and biconvex positive lens form.The 3rd lens unit G3 is comprised of towards the joint lens that the positive concave-convex lens of thing side forms towards the negative meniscus lens of thing side and convex surface towards the positive concave-convex lens of thing side, convex surface convex surface.The 4th lens unit G4 is comprised of the negative meniscus lens of convex surface towards the thing side.All lens elements among each lens unit G1, G2, G3, the G4 are arranged by said sequence from the thing side.

Below five surfaces are aspheric surfaces: the prism that has convex surface in both sides among the first lens unit G1 the picture side surface, the picture side surface of the biconvex positive lens among the second lens unit G2, convex surface among the 3rd lens unit G3 is towards the thing side surface of the positive concave-convex lens of thing side, convex surface among the 3rd lens unit G3 is towards the picture side surface of the positive concave-convex lens of thing side, and the convex surface among the 4th lens unit G4 is towards the thing side surface of the negative meniscus lens of thing side.

Example 1

The mm of unit

Surface data

Surface number r d nd vd

1* -9.669 7.20 1.88300 40.76

2 ∞ 0.20

3* 12.688 1.50 1.80610 40.92

4*-462.757 is variable

5 -10.258 0.80 1.88300 40.76

6 14.005 1.54 1.82114 24.06

7*-34.185 is variable

8(S) ∞ -0.50

9* 4.980 2.30 1.58313 59.38

10 22.870 0.58 1.84666 23.78

11 7.514 2.50 1.59201 67.02

12*-75.687 is variable

13* -9.866 1.00 1.52542 55.78

14-18.904 is variable

15 ∞ 0.50 1.53996 59.45

16 ∞ 0.27

17 ∞ 0.50 1.51633 64.14

18 ∞ 0.23

Picture plane (optical receiving surface)

Aspherical surface data

First surface

K＝-6.995，A4＝8.86364e-05，A6＝-1.36794e-06，A8＝9.48088e-08，A10＝-1.27868e-09

The 3rd surface

K＝0.000，A4＝-8.08906e-04，A6＝4.52266e-07，A8＝-1.05791e-06

The 4th surface

K＝13073.884，A4＝-1.96823e-04，A6＝-1.48392e-05，

A8＝-5.72156e-07，A10＝4.81467e-09

The 7th surface

K＝0.000，A4＝-1.20746e-04，A6＝5.92893e-06，A8＝-2.74132e-07，

A10＝1.07999e-08

The 9th surface

K＝0.000，A4＝-2.41925e-04，A6＝4.71805e-06，A8＝3.96700e-08

The 12 surface

K＝0.000，A4＝1.81119e-03，A6＝8.41610e-05，A8＝3.96164e-07，

A10＝7.96156e-07

The 13 surface

K＝-11.682，A4＝-1.68789e-03，A6＝5.61511e-05，A8＝-4.53373e-07，

A10＝-1.35706e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

Fno. 3.31 4.32 6.00

2ω(°) 66.88 37.47 22.04

BF 5.95 10.45 17.51

Total length 41.46 41.46 41.46

d4 0.60 3.37 0.60

d7 12.57 5.68 1.50

d12 5.22 4.84 4.72

d14 4.79 9.29 16.35

The unit focal length

f1＝-487.12 f2＝-15.65 f3＝9.54 f4＝-40.83

Example 2

The mm of unit

Surface data

Surface number r d nd vd

1* -10.060 7.20 1.88300 40.76

2 ∞ 0.20

3* 21.209 1.50 1.80610 40.92

4*-31.550 is variable

5 -11.016 0.80 1.88300 40.76

6 13.255 1.54 1.82114 24.06

7*-39.143 is variable

8(S) ∞ -0.50

9* 4.970 2.30 1.58313 59.38

10 22.888 0.58 1.84666 23.78

11 7.309 2.50 1.59201 67.02

12*-200.331 is variable

13* -7.210 1.00 1.49700 81.54

14-11.462 is variable

15 ∞ 0.40 1.51633 64.14

16 ∞ 0.35

Picture plane (optical receiving surface)

Aspherical surface data

First surface

K＝-5.778，A4＝1.53140e-04，A6＝-1.85187e-06，A8＝8.77509e-08，A10＝-1.31368e-09

The 3rd surface

K＝0.000，A4＝-1.04142e-03，A6＝-2.26093e-05，A8＝-1.10204e-06

The 4th surface

K＝0.000，A4＝-5.76267e-04，A6＝-2.99028e-05，A8＝-4.64492e-07，A10＝9.30735e-09

The 7th surface

K＝0.000，A4＝-9.75685e-05，A6＝5.99005e-06，A8＝-5.52928e-07，A10＝2.30371e-08

The 9th surface

K＝0.000，A4＝-2.12306e-04，A6＝1.61498e-06，A8＝1.84162e-07

The 12 surface

K＝0.000，A4＝1.97988e-03，A6＝3.82461e-05，A8＝1.14127e-05

The 13 surface

K＝-6.478，A4＝-2.11125e-03，A6＝9.00702e-05，A8＝-3.77657e-06，A10＝7.39411e-08

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.22 4.26 6.00

2ω(°) 66.79 37.67 22.10

BF 1.52 6.69 14.32

Total length 40.75 40.75 40.75

d4 0.60 3.29 0.60

d7 12.14 5.60 1.50

d12 9.38 8.05 7.22

d14 0.90 6.08 13.70

The unit focal length

f1＝-1001.62 f2＝-16.19 f3＝9.88 f4＝-42.42

Example 3

The mm of unit

Surface data

Surface number r d nd vd

1* -10.666 7.20 1.88300 40.76

2 ∞ 0.20

3* 42.875 1.50 1.80610 40.92

4*-19.626 is variable

5 -10.516 0.80 1.88300 40.76

6 13.808 1.54 1.82114 24.06

7*-33.671 is variable

8(S) ∞ -0.50

9* 5.114 2.30 1.58313 59.38

10 23.448 0.58 1.84666 23.78

11 7.427 2.50 1.59201 67.02

12*-100.639 is variable

13 59.530 1.00 1.49700 81.54

14 -56.357 0.70

15* -9.457 1.20 1.49700 81.54

16-54.366 is variable

17 ∞ 0.40 1.51633 64.14

18 ∞ 0.32

Picture plane (optical receiving surface)

Aspherical surface data

First surface

K＝-5.642，A4＝1.74468e-04，A6＝-9.25278e-07，A8＝3.88088e-08，A10＝-7.40724e-10

The 3rd surface

K＝0.000，A4＝-1.27036e-03，A6＝-3.11260e-05，A8＝-8.83439e-07

The 4th surface

K＝0.000，A4＝-8.02474e-04，A6＝-3.16970e-05，A8＝-9.15728e-08，A10＝1.44356e-09

The 7th surface

K＝0.000，A4＝-8.79701e-05，A6＝1.93385e-06，A8＝-2.39948e-07，A10＝1.33126e-08

The 9th surface

K＝0.000，A4＝-1.80618e-04，A6＝4.46534e-07，A8＝3.40266e-07

The 12 surface

K＝0.000，A4＝1.77865e-03，A6＝3.53295e-05，A8＝8.80257e-06

The 15 surface

K＝-11.971，A4＝-1.77410e-03，A6＝9.02388e-05，A8＝-4.31984e-06，A10＝9.59109e-08

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.18 4.24 6.00

2ω(°) 66.74 37.66 22.10

BF 1.62 6.90 14.52

Total length 41.08 41.08 41.08

d4 0.60 3.23 0.60

d7 11.82 5.51 1.50

d12 8.02 6.42 5.44

D16 1.03 6.31 13.93

The unit focal length

f1＝-1000.03 f2＝-16.25 f3＝10.01 f4＝-39.56

Example 4

The mm of unit

Surface data

Surface number r d nd vd

1* -11.115 7.40 1.90366 31.32

2 ∞ 0.40

3* 128.034 1.50 1.75520 27.51

4*-17.211 is variable

5 -10.244 0.80 1.88300 40.76

6 18.146 1.54 1.82114 24.06

7*-26.128 is variable

8(S) ∞ -0.50

9* 5.441 2.30 1.58313 59.38

10 35.722 0.58 1.84666 23.78

11 8.821 2.50 1.59201 67.02

12*-84.061 is variable

13 74.330 1.60 1.49700 81.54

14 -9.800 0.70

15* -6.800 0.60 1.53996 59.46

16 1315.793 is variable

17 ∞ 0.86 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

First surface

K＝-6.463，A4＝1.14372e-04，A6＝1.27139e-06，A8＝7.72338e-09，A10＝-5.79803e-10

The 3rd surface

K＝0.000，A4＝-1.56736e-03，A6＝-3.43864e-05，A8＝-1.16280e-06

The 4th surface

K＝0.000，A4＝-1.05374e-03，A6＝-3.06515e-05，A8＝-2.23376e-07，A10＝3.46638e-09

The 7th surface

K＝0.000，A4＝-5.65781e-05，A6＝5.12392e-07，A8＝-1.28807e-07，A10＝9.30988e-09

The 9th surface

K＝0.000，A4＝-1.19217e-04，A6＝9.45301e-07，A8＝3.71159e-07

The 12 surface

K＝0.000，A4＝1.46563e-03，A6＝2.40652e-05，A8＝5.48591e-06

The 15 surface

K＝-7.143，A4＝-2.70642e-03，A6＝1.40791e-04，A8＝-7.41075e-06，A10＝1.86143e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.24 4.32 6.00

2ω(°) 66.83 37.78 22.13

BF 4.42 9.85 17.19

Total length 43.13 43.13 43.13

d4 0.60 3.43 0.60

d7 12.51 5.51 1.50

d12 6.18 4.92 4.41

d16 2.90 8.33 15.67

The unit focal length

f1＝-87.54 f2＝-18.26 f3＝10.55 f4＝-52.58

Example 5

The mm of unit

Surface data

Surface number r d nd vd

1* -11.583 7.40 1.90366 31.32

2 ∞ 0.40

3* -436.681 1.50 1.75520 27.51

4*-14.913 is variable

5 -10.244 0.80 1.88300 40.76

6 20.030 1.54 1.82114 24.06

7*-25.471 is variable

8(S) ∞ -0.50

9* 5.440 2.30 1.58313 59.38

10 36.600 0.58 1.84666 23.78

11 8.535 2.50 1.59201 67.02

12*-34.209 is variable

13 -61.840 1.60 1.49700 81.54

14 -16.411 0.70

15* -7.459 0.60 1.53996 59.46

16-58.332 is variable

17 ∞ 0.40 1.51633 64.14

18 ∞ 0.34

Picture plane (optical receiving surface)

Aspherical surface data

First surface

K＝-7.120，A4＝6.91729e-05，A6＝3.81177e-07，A8＝8.49052e-08，A10＝-1.93952e-09

The 3rd surface

K＝0.000，A4＝-1.64212e-03，A6＝-3.39862e-05，A8＝-1.11973e-06

The 4th surface

K＝0.000，A4＝-1.12011e-03，A6＝-2.95328e-05，A8＝-4.30068e-08，A10＝-3.29865e-09

The 7th surface

K＝0.000，A4＝-5.13040e-05，A6＝-1.65894e-06，A8＝1.31797e-08，A10＝8.57360e-09

The 9th surface

K＝0.000，A4＝-1.71801e-04，A6＝-7.56342e-07，A8＝5.13068e-07

The 12 surface

K＝0.000，A4＝1.37457e-03，A6＝1.95338e-05，A8＝5.13111e-06

The 15 surface

K＝-8.443，A4＝-2.51401e-03，A6＝1.13928e-04，A8＝-4.62845e-06，A10＝5.61581e-09

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.09 4.23 6.00

2ω(°) 66.63 37.64 22.07

BF 2.04 6.99 14.02

Total length 41.13 41.13 41.13

d4 0.60 3.14 0.60

d7 11.48 5.26 1.50

d12 7.60 6.32 5.59

d16 1.43 6.38 13.42

The unit focal length

f1＝-107.88 f2＝-18.68 f3＝9.93 f4＝-25.00

Example 6

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.85135 40.10

2* 8.726 1.27

3 ∞ 6.10 1.88300 40.76

4 ∞ 0.20

5* 39.249 1.50 1.80139 45.45

6*-20.113 is variable

7 -14.379 0.80 1.88300 40.76

8 10.498 1.54 1.82114 24.06

9*-115.856 is variable

10(S) ∞ -0.50

11* 5.585 2.30 1.58313 59.38

12 6.528 0.60 1.84666 23.78

13 4.297 2.50 1.59201 67.02

14*-231.788 is variable

15* -37.172 1.00 1.52542 55.78

16-3936.644 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.24

Picture plane (optical receiving surface)

Aspherical surface data

Second surface

K＝-0.322，A4＝5.65948e-05，A6＝4.01499e-06，A8＝-2.16394e-07，A10＝4.03005e-09

The 5th surface

K＝0.000，A4＝-2.48024e-04，A6＝-7.10601e-06，A8＝-1.45377e-06

The 6th surface

K＝20.718，A4＝-4.65244e-05，A6＝1.26188e-05，A8＝-2.70762e-06，A 10＝1.11238e-07

The 9th surface

K＝0.000，A4＝5.80216e-06，A6＝3.86474e-08，A8＝1.43464e-08，A10＝1.16997e-09

The 11 surface

K=0.000, A4=-6.65874e-05, A6=5.13875e-06, A8=-4.60090e-08 the 14 surface

K＝0.000，A4＝1.23863e-03，A6＝2.47834e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.14790e-04，A6＝3.62905e-05，A8＝-4.29689e-06，A10＝1.89880e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.45 4.46 6.00

2ω(°) 66.94 37.81 22.05

BF 10.16 13.51 12.85

Total length 46.64 46.64 46.64

d6 0.40 3.35 1.58

d9 14.41 6.73 1.80

d14 3.66 5.05 12.41

d16 8.99 12.35 11.69

The unit focal length

f1＝-135.45 f2＝-16.73 f3＝10.78 f4＝-71.43

Example 7

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.90366 31.32

2* 9.474 1.30

3 ∞ 6.10 1.88300 40.80

4 ∞ 0.20

5* 214.997 1.37 1.80139 45.45

6*-15.441 is variable

7 -14.080 0.70 1.89800 34.01

8 -23.787 0.30

9 -46.122 0.70 1.88300 40.76

10 7.919 1.54 1.82114 24.06

11* 730.111 is variable

12(S) ∞ -0.50

13* 6.342 2.34 1.88300 40.80

14* 8.000 1.00

15 16.989 2.66 1.60738 56.81

16 -5.076 0.60 1.92286 20.88

17-10.130 is variable

18* -4.872 2.00 1.49700 81.54

19-7.000 is variable

20 ∞ 0.40 1.51633 64.14

21 ∞ 0.35

Picture plane (optical receiving surface)

Aspherical surface data

Second surface

K＝0.235，A4＝1.93221e-04，A6＝3.57769e-06，A8＝3.77560e-07，A10＝-1.36353e-08

The 5th surface

K＝0.000，A4＝4.74769e-04，A6＝4.43554e-07，A8＝9.55336e-07

The 6th surface

K＝0.000，A4＝3.03478e-04，A6＝-5.80636e-06，A8＝1.15211e-06

The 11 surface

K＝0.000，A4＝-8.91666e-05，A6＝1.03333e-05，A8＝-8.97361e-07，A10＝3.17188e-08

The 13 surface

K＝0.000，A4＝2.27107e-04，A6＝2.64978e-06，A8＝8.96538e-07

The 14 surface

K＝0.000，A4＝9.16289e-04，A6＝2.65625e-06，A8＝3.86325e-06，A10＝3.51954e-09

The 18 surface

K＝0.000，A4＝3.14352e-04，A6＝-1.45033e-05，A8＝4.52807e-06，A10＝-2.48295e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.70

FNO. 3.42 4.4 16.00

2ω(°) 68.46 38.40 22.14

BF 1.76 6.04 12.38

Total length 45.78 45.78 45.78

d6 0.40 3.46 0.50

d11 12.74 4.99 0.60

d17 9.88 10.29 11.30

d19 1.15 5.43 11.76

The unit focal length

f1＝-90.35 f2＝-18.42 f3＝10.67 f4＝-46.86

Example 8

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.90366 31.32

2* 9.319 1.30

3 ∞ 6.10 1.88300 40.80

4 ∞ 0.20

5* 76.833 1.37 1.80139 45.45

6*-19.455 is variable

7 -13.947 0.70 1.89800 34.01

8 -23.872 0.30

9 -61.238 0.70 1.88300 40.76

10 7.884 1.54 1.82114 24.06

11* 1064.449 is variable

12(S) ∞ -0.50

13* 6.337 2.34 1.88300 40.80

14* 8.032 1.00

15 16.358 2.66 1.60738 56.81

16 -5.076 0.60 1.92286 20.88

17-10.232 is variable

18* -4.811 3.00 1.49700 81.54

19-7.000 is variable

20 ∞ 0.50 1.51633 64.14

21 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

Second surface

K＝-0.130，A4＝1.49423e-04，A6＝3.98047e-06，A8＝2.85983e-07，A10＝-1.22151e-08

The 5th surface

K＝0.000，A4＝4.31902e-04，A6＝1.03352e-06，A8＝6.40435e-07

The 6th surface

K＝0.000，A4＝3.01985e-04，A6＝-5.22165e-06，A8＝8.38311e-07

The 11 surface

K＝0.000，A4＝-9.15326e-05，A6＝1.09818e-05，A8＝-8.91733e-07，A10＝3.13179e-08

The 13 surface

K＝0.000，A4＝2.19372e-04，A6＝2.60634e-06，A8＝8.86538e-07

The 14 surface

K＝0.000，A4＝9.02367e-04，A6＝5.48721e-07，A8＝3.95804e-06，A10＝-2.56278e-09

The 18 surface

K＝0.000，A4＝1.39268e-04，A6＝-8.05906e-06，A8＝2.76445e-06，A10＝-1.57684e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.70

FNO. 3.49 4.49 6.00

2ω(°) 67.85 38.22 22.08

BF 1.68 6.42 12.58

Total length 46.71 46.71 46.71

d6 0.40 3.58 0.50

d11 13.39 5.05 0.61

d17 9.24 9.66 11.01

d19 0.99 5.73 11.89

The unit focal length

f1＝-52.45 f2＝-20.08 f3＝10.58 f4＝-56.78

Example 9

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.90366 31.32

2* 9.671 1.30

3 ∞ 6.10 1.88300 40.80

4 ∞ 0.20

5* 49.879 1.50 1.80139 45.45

6*-19.966 is variable

7 -17.951 0.80 1.88300 40.76

8 8.378 1.54 1.82114 24.06

9*-305.609 is variable

10(S) ∞ -0.50

11* 6.506 2.30 1.88300 40.80

12* 8.000 1.00

13 16.763 2.50 1.60738 56.81

14 -5.076 0.60 1.92286 20.88

15-9.625 is variable

16* -4.863 1.00 1.497008 1.54

17-7.000 is variable

18 ∞ 0.50 1.53996 59.45

19 ∞ 0.27

20 ∞ 0.40 1.51633 64.14

21 ∞ 0.31

Picture plane (optical receiving surface)

Aspherical surface data

Second surface

K＝0.024，A4＝1.70072e-04，A6＝5.04323e-06，A8＝1.47597e-07，A10＝-1.76747e-09

The 5th surface

K＝0.000，A4＝3.90268e-04，A6＝-9.13537e-06，A8＝1.67246e-06

The 6th surface

K＝0.000，A4＝2.39852e-04，A6＝-1.57725e-05，A8＝1.97072e-06

The 9th surface

K＝0.000，A4＝-6.51307e-05，A6＝1.28635e-05，A8＝-1.34323e-06，A10＝5.12631e-08

The 11 surface

K＝0.000，A4＝1.41690e-04，A6＝2.43034e-06，A8＝6.60052e-07

The 12 surface

K＝0.000，A4＝7.51383e-04，A6＝-4.90855e-06，A8＝3.96495e-06，A10＝-8.30497e-08

The 16 surface

K＝0.000，A4＝3.49376e-04，A6＝3.80029e-07，A8＝1.98719e-06，A10＝-5.63213e-08

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.70

FNO. 3.37 4.36 6.00

2ω(°) 68.05 38.25 22.11

BF 2.18 5.90 12.14

Total length 44.11 44.11 44.11

d6 0.40 3.66 0.99

d9 12.29 4.78 0.60

d15 10.20 10.73 11.34

d17 1.01 4.73 10.97

The unit focal length

f1＝-100.00 f2＝-18.57 f3＝10.61 f4＝-37.94

Example 10

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 9.353 1.18

3 ∞ 6.50 1.88300 40.76

4 ∞ 0.20

5* 54.585 1.50 1.80610 40.92

6*-21.467 is variable

7 -15.367 0.80 1.88300 40.76

8 11.186 1.54 1.82114 24.06

9*-108.680 is variable

10(S) ∞ -0.50

11* 5.595 2.30 1.58313 59.38

12 8.264 0.60 1.84666 23.78

13 4.944 2.50 1.59201 67.02

14*-285.753 is variable

15* -13.834 1.00 1.52542 55.78

16-18.397 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.24

Picture plane (optical receiving surface)

Aspherical surface data

The 5th surface

K＝0.000，A4＝-1.95494e-04，A6＝-2.35465e-05，A8＝-5.44605e-07

The 6th surface

K＝24.418，A4＝4.24267e-05，A6＝-7.20819e-06，A8＝-1.31597e-06，A10＝9.20504e-08

The 9th surface

K＝0.000，A4＝-3.04196e-05，A6＝8.34662e-06，A8＝-8.84818e-07，A10＝3.58403e-08

The 11 surface

K＝0.000，A4＝-7.59773e-05，A6＝7.56590e-06，A8＝-1.00701e-07

The 14 surface

K＝0.000，A4＝1.28869e-03，A6＝3.25747e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.76067e-04，A6＝6.45703e-05，A8＝-8.47416e-06，A10＝4.24595e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.43 4.45 6.00

2ω(°) 67.05 37.90 22.11

BF 9.06 11.14 10.66

Total length 46.84 46.84 46.84

d6 0.40 3.35 0.50

d9 14.02 6.17 1.80

d14 5.04 7.86 15.56

d16 7.90 9.97 9.50

The unit focal length

f1＝-62.73 f2＝-18.19 f3＝10.97 f4＝-114.82

Example 11

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 9.112 1.21

3 ∞ 6.10 1.88300 40.76

4 ∞ 0.20

5* 43.613 1.50 1.80610 40.92

6*-20.721 is variable

7 -14.328 0.80 1.88300 40.76

8 12.319 1.54 1.82114 24.06

9*-94.067 is variable

10(S) ∞ -0.50

11* 5.609 2.30 1.58313 59.38

12 6.847 0.60 1.84666 23.78

13 4.464 2.50 1.59201 67.02

14*-248.323 is variable

15* -37.147 1.00 1.52542 55.78

16-3936.644 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.24

Picture plane (optical receiving surface)

Aspherical surface data

The 5th surface

K＝0.000，A4＝-2.15101e-04，A6＝-1.73342e-05，A8＝-7.70234e-07

The 6th surface

K＝22.501，A4＝-9.99274e-06，A6＝4.36337e-06，A8＝-2.12295e-06，A10＝1.12329e-07

The 9th surface

K＝0.000，A4＝4.41280e-06，A6＝1.64793e-06，A8＝-1.68116e-07，A10＝8.31726e-09

The 11 surface

K＝0.000，A4＝-6.97115e-05，A6＝5.91045e-06，A8＝-5.27998e-08

The 14 surface

K＝0.000，A4＝1.24098e-03，A6＝2.63151e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.48264e-04，A6＝4.56530e-05，A8＝-5.99304e-06，A10＝2.96418e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.93 18.61

FNO. 3.45 4.48 6.00

2ω(°) 66.99 37.70 22.05

BF 10.16 13.23 12.25

Total length 46.81 46.81 46.81

d6 0.40 3.50 1.68

d9 14.56 6.66 1.80

d14 3.74 5.46 13.13

d16 9.00 12.07 11.08

The unit focal length

f1＝-87.91 f2＝-17.44 f3＝10.83 f4＝-71.38

Example 12

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 9.032 1.22

3 ∞ 6.10 1.88300 40.76

4 ∞ 0.20

5* 41.629 1.50 1.80139 45.45

6*-19.789 is variable

7 -14.224 0.80 1.88300 40.76

8 11.048 1.54 1.82114 24.06

9*-98.307 is variable

10(S) ∞ -0.50

11* 5.593 2.30 1.58313 59.38

12 6.682 0.60 1.84666 23.78

13 4.377 2.50 1.59201 67.02

14*-301.863 is variable

15* -36.896 1.00 1.52542 55.78

16-3936.644 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.23

Picture plane (optical receiving surface)

Aspherical surface data

The 5th surface

K＝0.000，A4＝-2.51545e-04，A6＝-1.39542e-05，A8＝-1.03098e-06

The 6th surface

K＝20.180，A4＝-3.60247e-05，A6＝8.08672e-06，A8＝-2.36692e-06，A10＝1.12404e-07

The 9th surface

K＝0.000，A4＝4.00371e-06，A6＝4.88468e-07，A8＝-7.59255e-08，A10＝5.60939e-09

The 11 surface

K＝0.000，A4＝-6.71385e-05，A6＝5.65756e-06，A8＝-5.44207e-08

The 14 surface

K＝0.000，A4＝1.24426e-03，A6＝2.67466e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.29666e-04，A6＝3.85564e-05，A8＝-4.52432e-06，A10＝1.98277e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.46 4.47 6.00

2ω(°) 66.98 37.78 22.05

BF 10.16 13.24 12.43

Total length 46.84 46.84 46.84

d6 0.40 3.54 1.81

d9 14.62 6.77 1.80

d14 3.70 5.34 12.85

d16 9.01 12.08 11.27

The unit focal length

f1＝-118.68 f2＝-17.02 f3＝10.84 f4＝-70.89

Example 13

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.85135 40.10

2* 7.333 1.52

3 ∞ 6.10 1.88300 40.76

4 ∞ 0.20

5* 39.616 1.50 1.80139 45.45

6*-20.144 is variable

7 -20.151 0.80 1.88300 40.76

8 11.329 1.54 1.82114 24.06

9*-275.016 is variable

10(S) ∞ -0.50

11* 5.454 2.30 1.58313 59.38

12 6.54 10.30

13 6.669 0.60 1.84666 23.78

14 4.423 2.50 1.59201 67.02

15*-125.446 is variable

16* -14.975 1.00 1.56732 42.82

17 264.294 1.50 1.49700 81.54

18-19.957 is variable

19 ∞ 0.50 1.53996 59.45

20 ∞ 0.30

21 ∞ 0.50 1.51633 64.14

22 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

Second surface

K＝-0.043，A4＝1.17983e-04，A6＝6.55920e-06，A8＝-4.98744e-07，A10＝1.30306e-08

The 5th surface

K＝0.000，A4＝-1.66741e-04，A6＝-1.72272e-06，A8＝-1.85162e-06

The 6th surface

K＝17.698，A4＝-1.04265e-04，A6＝9.53257e-06，A8＝-2.47236e-06，A10＝6.91668e-08

The 9th surface

K＝0.000，A4＝4.52346e-05，A6＝4.42125e-07，A8＝1.29363e-07，A10＝-1.01530e-08

The 11 surface

K＝0.000，A4＝-8.78437e-05，A6＝2.23735e-06，A8＝-4.95027e-08

The 15 surface

K＝0.000，A4＝1.32099e-03，A6＝2.73111e-05，A8＝5.00000e-06

The 16 surface

K＝0.000，A4＝9.50164e-05，A6＝4.56970e-06，A8＝1.09110e-06，A10＝-6.15435e-08

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.25 11.10 14.40

FNO. 3.93 5.22 6.00

2ω(°) 69.59 37.34 28.64

BF 9.26 15.72 17.66

Total length 45.92 45.92 45.92

d6 0.40 3.28 2.66

d9 13.07 4.35 1.83

d15 3.13 2.50 3.72

d18 7.95 14.40 16.34

The unit focal length

f1＝-53.35 f2＝-21.64 f3＝10.51 f4＝-85.47

Example 14

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 9.344 1.18

3 ∞ 6.50 1.88300 40.76

4 ∞ 0.20

5* 50.714 1.50 1.80610 40.92

6*-21.604 is variable

7 -15.086 0.80 1.88300 40.76

8 11.246 1.54 1.82114 24.06

9*-107.602 is variable

10(S) ∞ -0.50

11* 5.589 2.30 1.58313 59.38

12 8.235 0.60 1.84666 23.78

13 4.936 2.50 1.59201 67.02

14*-321.369 is variable

15* -15.870 1.00 1.52542 55.78

16-22.081 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.30

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

The 5th surface

K＝0.000，A4＝-1.52267e-04，A6＝-2.41321e-05，A8＝-5.09857e-07

The 6th surface

K＝25.185，A4＝7.80396e-05，A6＝-4.41609e-06，A8＝-1.67386e-06，A10＝1.09764e-07

The 9th surface

K＝0.000，A4＝-2.27094e-05，A6＝4.97956e-06，A8＝-5.13970e-07，A10＝2.18806e-08

The 11 surface

K＝0.000，A4＝-7.48440e-05，A6＝7.22007e-06，A8＝-8.53979e-08

The 14 surface

K＝0.000，A4＝1.29550e-03，A6＝3.33359e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.82701e-04，A6＝6.99789e-05，A8＝-9.58644e-06，A10＝4.94067e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.44 4.45 6.00

2ω(°) 67.06 37.89 22.12

BF 9.22 10.96 10.15

Total length 46.83 46.83 46.83

d6 0.40 3.37 0.50

d9 14.01 6.19 1.80

d14 4.88 7.99 16.06

d16 7.90 9.64 8.84

The unit focal length

f1＝-67.73 f2＝-17.88 f3＝10.97 f4＝-113.70

Example 15

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 9.15 1.21

3 ∞ 6.50 1.88300 40.76

4 -1000.000 0.20

5* 51.283 1.50 1.80610 40.92

6*-21.625 is variable

7 -15.169 0.80 1.88300 40.76

8 11.431 1.54 1.82114 24.06

9*-89.018 is variable

10(S) ∞ -0.50

11* 5.630 2.30 1.58313 59.38

12 7.689 0.60 1.84666 23.78

13 4.717 2.50 1.59201 67.02

14* 562.504 is variable

15* -7.272 1.00 1.52542 55.78

16-7.839 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

The 5th surface

K＝0.000，A4＝-1.77490e-04，A6＝-1.55278e-05，A8＝-6.83985e-07

The 6th surface

K＝23.898，A4＝4.73950e-05，A6＝-1.10132e-06，A8＝-1.38050e-06，A10＝7.82556e-08

The 9th surface

K＝0.000，A4＝-2.27353e-05，A6＝5.04715e-06，A8＝-4.74407e-07，A10＝1.83306e-08

The 11 surface

K＝0.000，A4＝-3.96094e-05，A6＝5.49406e-06，A8＝-1.74382e-08

The 14 surface

K＝0.000，A4＝1.28142e-03，A6＝2.91554e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.21219e-04，A6＝4.28440e-05，A8＝-4.23539e-06，A10＝1.57593e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.43 4.43 6.00

2ω(°) 67.05 37.95 22.19

BF 9.19 11.29 7.14

Total length 47.62 47.62 47.62

d6 0.40 3.40 0.50

d9 14.32 6.23 1.80

d14 5.37 8.35 19.83

d16 7.90 10.01 5.85

The unit focal length

f1＝-66.07 f2＝-18.58 f3＝11.30 f4＝-485.54

Example 16

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 8.928 1.23

3 986.240 6.50 1.88300 40.76

4 -501.230 0.20

5* 45.459 1.50 1.80610 40.92

6*-21.131 is variable

7 -15.577 0.80 1.88300 40.76

8 11.157 1.54 1.82114 24.06

9*-139.139 is variable

10(S) ∞ -0.50

11* 5.644 2.30 1.58313 59.38

12 7.012 0.60 1.84666 23.78

13 4.460 2.50 1.59201 67.02

14* 344.818 is variable

15* -6.264 1.00 1.49700 81.54

16-6.615 is variable

17 ∞ 0.50 1.53996 59.45

18 ∞ 0.27

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

The 5th surface

K＝0.000，A4＝-2.27230e-04，A6＝-9.75416e-06，A8＝-1.01440e-06

The 6th surface

K＝22.009，A4＝-1.79552e-05，A6＝5.75292e-06，A8＝-1.82073e-06，A10＝7.77447e-08

The 9th surface

K＝0.000，A4＝-1.30102e-05，A6＝2.52036e-06，A8＝-2.38120e-07，A10＝1.01733e-08

The 11 surface

K＝0.000，A4＝-2.76435e-05，A6＝4.56133e-06，A8＝2.14489e-09

The 14 surface

K＝0.000，A4＝1.25753e-03，A6＝2.46703e-05，A8＝5.00000e-06

The 15 surface

K＝0.000，A4＝-1.36063e-04，A6＝4.16360e-05，A8＝-4.11322e-06，A10＝1.57461e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.46 10.90 18.61

FNO. 3.42 4.40 6.00

2ω(°) 67.03 37.94 22.22

BF 9.19 11.47 6.78

Total length 47.66 47.66 47.66

d6 0.40 3.39 0.50

d9 14.32 6.28 1.80

d14 5.38 8.15 20.21

d16 7.90 10.18 5.49

The unit focal length

f1＝-95.11 f2＝-17.85 f3＝11.35 f4＝-4387.93

Example 17

The mm of unit

Surface data

Surface number r d nd vd

1 ∞ 0.70 1.88300 40.76

2 10.228 1.05

3 986.240 7.00 1.80610 40.92

4*-17.915 is variable

5 -9.376 0.80 1.88300 40.76

6 20.781 1.54 1.82114 24.06

7*-21.134 is variable

8(S) ∞ -0.50

9* 5.412 2.30 1.58313 59.38

10 5.389 0.60 1.84666 23.78

11 3.756 2.50 1.59201 67.02

12* 87.014 is variable

13* 12.804 1.00 1.49700 81.54

14 9.922 is variable

15 ∞ 0.50 1.53996 59.45

16 ∞ 0.27

17 ∞ 0.50 1.51633 64.14

18 ∞ 0.36

Picture plane (optical receiving surface)

Aspherical surface data

The 4th surface

K＝14.923，A4＝1.86211e-04，A6＝1.49944e-05，A8＝-3.76324e-07，A10＝4.00000e-08

The 7th surface

K＝0.000，A4＝5.37991e-06，A6＝-6.59192e-07，A8＝-1.89552e-07，A10＝1.53746e-08

The 9th surface

K＝0.000，A4＝-7.44715e-05，A6＝2.68948e-06，A8＝-9.27734e-08

The 12 surface

K＝0.000，A4＝1.30124e-03，A6＝2.46588e-05，A8＝5.00000e-06

The 13 surface

K＝0.000，A4＝-2.17005e-04，A6＝4.46579e-05，A8＝-4.36178e-06，A10＝1.65618e-07

The zoom data

WE ST TE

IH 3.60 3.60 3.60

Focal length 6.35 10.89 18.61

FNO. 3.43 4.54 6.00

2ω(°) 67.95 37.35 22.03

BF 9.18 12.06 5.84

Total length 45.10 45.10 45.10

D4 0.40 3.50 0.50

D7 14.55 6.36 1.80

D12 3.98 6.19 19.97

D14 7.90 10.77 4.55

The unit focal length

f1＝-46.58 f2＝-18.63 f3＝11.03 f4＝-100.22

Figure 18 A to 34C be according to the zoom lens of the first to the 17 execution mode therein zoom lens focus on aberration diagram under the state on the object point of infinite point.These aberration diagrams show respectively Figure 18 A to the wide-angle side of 34A, at Figure 18 B to the middle focal length state of 34B and in the spherical aberration of taking the photograph far-end (SA), astigmatism (AS), distortion (DT) and the convergent-divergent multiplying power chromatic aberation (CC) of Figure 18 C to 34C.In these figure, FIY represents maximum image height degree.

The below shows the expression formula (1-1) of each execution mode to the value of (1-10).

Here, the value related with conditional expression (1) is that carries out image is picked up and do not had value under the state of distortion correction therein.

Example 1 example 2 examples 3 examples 4 examples 5

(1)fg4/ihw -11.342 -11.784 -10.989 -14.604 -6.944

(2)βg4(t)/βg4(w) 1.240 1.279 1.310 1.233 1.439

(3)Dg4/fg4 -0.024 -0.024 -0.073 -0.055 -0.116

(4)enp(w)/fw 1.146 1.145 1.146 1.146 1.146

(5)fg4/fg1 0.084 0.042 0.040 0.601 0.232

(6)Dpr/fw 1.115 1.115 1.115 1.146 1.146

(7)nd(g4i) 1.525 1.497 1.497 1.540 1.540

(8)vd(g4i) 55.777 81.540 81.540 59.460 59.460

(9)ft/fw 2.881 2.881 2.881 2.881 2.881

(10)nd(pr) 1.883 1.883 1.883 1.90366 1.90366

Example 6 examples 7 examples 8 examples 9

(1)fg4/ihw -19.841 -13.016 -15.773 -10.540

(2)βg4(t)/βg4(w) 1.033 1.193 1.155 1.233

(3)Dg4/fg4 -0.014 -0.043 -0.053 -0.026

(4)enp(w)/fw 1.161 1.161 1.161 1.161

(5)fg4/fg1 0.527 0.519 1.083 0.379

(6)Dpr/fw 0.944 0.944 0.944 0.944

(7)nd(g4i) 1.525 1.497 1.497 1.497

(8)vd(g4i) 55.777 81.540 81.540 81.540

(9)ft/fw 2.881 2.895 2.895 2.895

(10)nd(pr) 1.883 1.883 1.883 1.883

(here, the value related with conditional expression (1) given below is that the effective image picking region is value in the barrel-shaped situation in wide-angle side therein after distortion correction.)

Example 1 example 2 examples 3 examples 4 examples 5

IH 3.34 3.343 3.347 3.348 3.348

Angle of half field-of view 30.819 30.859 30.891 30.897 30.887

(1)fg4/ihw -12.2251 -12.6903 -11.8201 -15.7036 -7.46714

Example 6 examples 7 examples 8 examples 9

IH 3.345 3.302 3.317 3.315

Angle of half field-of view 30.869 31.06 30.96 30.985

(1)fg4/ihw -21.3538 -14.1907 -17.1188 -11.446

Example 10 examples 11 examples 12 examples 13

(11)D1p/fw 0.23 0.23 0.23 0.24

(12)Dlnpr/fw 0.18 0.19 0.19 0.24

(13)Dpr/fw 1.01 0.94 0.94 0.98

(14)(rlno+rlni)/(rlno-rlni)

1.00 1.00 1.00 1.00

(15)(rlpo+rlpi)/(rlpo-rlpi)

0.44 0.36 0.36 0.33

(16)P1p/Pg1 -3.25 -4.99 7.01 -3.17

(17)P1p/Pg2 -0.94 -0.99 -1.01 -1.28

(18)ft/fw 2.88 2.88 2.88 2.30

(19)Pg2/Pg1 3.45 5.04 6.97 2.47

Image height degree (wide-angle side) after the correcting distortion

3.341 3.344 3.344 3.324

The angle of visual field (wide-angle side) after the correcting distortion

61.69 61.73 61.72 63.74

Example 14 examples 15 examples 16 examples 17

(11)D1p/fw 0.23 0.23 0.23 -

(12)Dlnpr/fw 0.18 0.19 0.19 0.17

(13)Dpr/fw 1.01 1.01 1.01 1.10

(14)(rlno+rlni)/(rlno-rlni)

1.00 1.00 1.00 1.00

(15)(rlpo+rlpi)/(rlpo-rlpi)

0.40 0.41 0.37 -

(16)P1p/Pg1 -3.57 -3.47 -5.26 -

(17)P1p/Pg2 -0.94 -0.98 -0.99 -

(18)ft/fw 2.88 2.88 2.88 2.93

(19)Pg2/Pg1 3.79 3.56 5.33 2.50

Image height degree (wide-angle side) after the correcting distortion

3.341 3.342 3.343 3.343

The angle of visual field (wide-angle side) after the correcting distortion

61.69 61.71 61.72 62.57

Can be on the thing side of first lens unit, between first lens unit and the second lens unit, between the second lens unit and the 3rd lens unit, between the 3rd lens unit and the 4th lens unit, perhaps arrange glare stop at the 4th lens unit with between as the plane.Be arranged in the zoom lens and go for removing dazzle light with the members of frame of supporting lens.Alternatively, can provide independent parts for this purpose.This members of frame or separate part can consist of glare stop.

Alternatively, can be by direct printing, tint with black, the arbitrary lens that perhaps comprise in zoom lens by attaching black foil or bur arrange glare stop.

The aperture of glare stop can have various shapes, and for example circular, oval, rectangle or polygon perhaps can be defined by the curve of mathematical function appointment the shape in aperture.Glare stop not only can be removed harmful light beam, can also remove the light beam that may cause broom dazzle etc. in the outer peripheral areas of picture region.

Further preferably, at least one surface of a plurality of lens that comprise in zoom lens is coated with anti-reflection coating.

In addition, in order to prevent mirage phantom and dazzle, usually, anti-reflection coating is coated to lens surface with contact with air.

On the other hand, at the composition surface that engages lens, the refractive index of adhesive is sufficiently high with respect to the refractive index of air.Therefore, in many cases, reflectivity is the rank of signal layer coating originally, and is perhaps lower, and in situation seldom applying coating.Yet, even when also positively applying anti-reflection coating to composition surface, can further reduce mirage phantom and dazzle, and obtain more gratifying image.

Particularly, recently, the glass material with high index of refraction has been widely used in the optical system of video camera, thereby aberration correction is had obvious effect.Yet when the glass material that will have high index of refraction was used as the joint lens, the reflection at composition surface place became and can not ignore.In this case, it is effective especially applying anti-reflection coating at composition surface.

Effective use of composition surface coating is disclosed in Japanese kokai publication hei 2-27301 communique, 2001-324676 communique, 2005-92115 communique and No. 7116482 communique of United States Patent (USP).In these patent documentations, joint lens surface coating in the first lens unit of positive front zoom-lens system has been described, and can be with joint lens surface coatings applications the joint lens surface with positive refracting power in of the present invention first lens unit in identical with disclosed joint lens surface coating in these patent documentations.

As the coating material that will use, according to the refractive index of jointing material with as the refractive index of the lens on basis, the coating material that can suitably select to have relatively high refractive index, for example Ta ₂O ₅, TiO ₂, Nb ₂O ₅, ZrO ₂, HfO ₂, CeO ₂, SnO ₂, In ₂O ₃, ZnO and Y ₂O ₃, and the coating material with relatively low refractive index, for example MgF ₂, SiO ₂, and Al ₂O ₃, and it is set to satisfy the film thickness of phase condition.

Very natural, be similar to the coating on the lens surface of ingress of air, also can be so that the coating on the composition surface be laminated coating.Be no less than film thickness and the coating material of two-layer film by number of combinations suitably, can further reduce reflectivity, and control spectral characteristic and angle characteristic.

And, self-evident, for the composition surface of the lens the lens in the first lens unit, also be effective based on similar thought applying coating on this composition surface.

(the electronically execution mode of aberration correction)

In the present invention, record and demonstration image when proofreading and correct electronically the barrel-shaped distortion that occurs in the wide-angle side.In the zoom-lens system of these execution modes, in wide-angle side, at rectangle photoelectricity conversion table face barrel-shaped distortion appears.And taking the photograph far-end, and near the middle focal length state, suppressed the appearance of distortion.

For correcting distortion electronically, so that the effective image picking region is barrel-shaped in wide-angle side, and at the middle focal length state with to take the photograph far-end be rectangle.And, by the image processing image transitions is carried out in the effective image picking region that sets in advance, and be converted into the rectangular image information that has reduced distortion.Arrange so that the image height degree IH of wide-angle side _wImage height degree IH less than the middle focal length state _sAnd the image height degree IH that takes the photograph far-end _t

Use image transitions section, it is processed by image, will pick up by the picture that zoom lens are formed the signal of telecommunication that produces and be converted to the picture signal that the image of the color imbalance that convergent-divergent multiplying power chromatic aberation causes has wherein been proofreaied and correct in expression.The image that can be improved by the convergent-divergent multiplying power chromatic aberation that compensates electronically zoom lens.In the electronic still video camera, the image of object is divided into the image of three primary colors (be first, second and three primary colors) usually, and by reproducing coloured image by the output signal of calculating overlapping each color.

Have at zoom lens in the situation of convergent-divergent multiplying power chromatic aberation, if the image that adopts the first primary lights as benchmark, the position that will form with the image of the first primary lights, the position that forms of the image of the second primary lights and three primary colors light is offset to some extent so.For the convergent-divergent multiplying power chromatic aberation of correcting image electronically, information based on the aberration of zoom lens, for each pixel of image pick-up element, obtain in advance the picture position of the second primary lights and three primary colors light with respect to the side-play amount of the picture position of the first primary lights.

Can carry out coordinate transform with respect to the mode of the skew of the picture position of the first primary lights for each pixel of institute's captured image by correction.In the situation that for example image is comprised of red (R), green (G) and blue (B) three primary colors output signal therein, can be in advance each pixel be obtained R and B picture position from the skew of G picture position, and can carry out coordinate transform with the skew of correction with the G picture position to institute's captured image, and can output calibration R and B signal afterwards.

Because convergent-divergent multiplying power chromatic aberation changes according to zoom position, focal position and stop value, so preferably, storage is for second and the tristimulus image position of each lens position (being zoom position, focal position and the stop value) side-play amount with respect to the first primary color image position, as correction data in storage device.Can be according to lens position and with reference to this correction data.Therefore, can export calibrated with respect to second and tristimulus signals of the skew of the first primary colour signal.

(correction of distortion)

In addition, when using zoom-lens system of the present invention, carry out electronically the figure adjustment to image distortion.The below will describe the basic conception for the figure adjustment of image distortion.

For example, as shown in Figure 35, centered by the intersection point on optical axis and image pickup plane, will with the circumference (image height degree) of the radius R that connects in the longer sides of effective image pick-up plane on the convergent-divergent multiplying power fix, and make the benchmark of this circumference for proofreading and correct.Next, press on the circumference (image height degree) of any radius r (ω) except radius R each roughly that radiation direction moves, and (ω) carry out correction by become r ' at the mobile so that radius of concentric circles.

For example, in Figure 35, will be positioned at any radius r of inboard of the circle of radius R ₁Some P on the circumference (ω) ₁Center towards circle moves to the radius r that will proofread and correct ₁Some P on ' (ω) the circumference ₂And, will be positioned at any radius r in the outside of the circle of radius R ₂Some Q on the circumference (ω) ₁Move to the radius r that to proofread and correct towards the direction of leaving from the center of circle ₂Some Q on ' (ω) the circumference ₂

Here, r ' (ω) can be expressed as.

r′(ω)＝α·f·tanω(0≤α≤1)

Wherein, ω is that half image angle and the f of object are the focal lengths of imaging optical system (zoom-lens system among the present invention).

Here, when making the desirable image height degree corresponding with the circle (image height degree) of radius R be Y, so

α＝R/Y＝R/(f·tanω)。

It is desirable to, optical system is with respect to the optical axis Rotational Symmetry.In other words, distortion is also by occurring with respect to the rotational symmetric mode of optical axis.Therefore, as mentioned above, in the situation of electronically calibrating optical distortion, on the angle of data volume and amount of calculation, can think favourable when carrying out timing by following processing, described processing comprises: the convergent-divergent multiplying power on the circumference (image height degree) of the radius R that connects in the longer sides of fixing in the situation centered by the intersection point on the optical axis on reproduced image and image pickup plane and effective image pick-up plane, move each point on the circumference (image height degree) of any radius r (ω) except radius R by radiation direction roughly, and mobile so that radius becomes r ' (ω) at concentric circles.

In addition, optical image no longer is continuous amount (because sampling) at the time point by electronic image pickup device captured image.Therefore, as long as the pixel on the electronic image pickup device is not to arrange radially, the circle of the radius R of accurately describing on optical image is accurate circle no longer just.

In other words, about the shape correction of the view data that represents for the various discrete coordinate points, do not exist can fixedly scaling multiplying power circle.Therefore, for each pixel (Xi, Yj), can use the method for determining mobile destination coordinate (Xi ', Yj ').When two or more points (Xi, Yj) move to coordinate (Xi ', Yj '), get the mean value of the value of each pixel.And when not having mobile point, the value of coordinate that can be by using some surrounding pixels (Xi ', Yj ') is carried out interpolation.

When because foozle of optical system or electronic image pickup device etc. and so that during with respect to the distortion of optical axis very remarkable (especially having in the electronic image pickup apparatus of zoom-lens system), and when the circle of the radius R of describing at optical image was asymmetric, this method was effective for correction.And when geometric distortion occurring when in image pick-up element or various output device signal reproduction being image, it is effective for correction.

In electronic image pickup apparatus of the present invention, for calculation correction amount r ' (ω)-r (ω), can carry out following setting: in the recording medium of relation record in being built in electronic image pickup apparatus between the relation between r (ω) (i.e. half image angle) and the image height degree or true image height degree r and desirable image height degree the r '/α.

For the extreme deficiency of light quantity can not appear in the two ends place of the image after the distortion correction on short side direction, the radius R expression formula that can meet the following conditions.

0≤R≤0.6Ls

Wherein, Ls is the length that effective image picks up the minor face of face.

Preferably, the radius R expression formula that meets the following conditions.

0.3Ls≤R≤0.6Ls

In addition, most advantageously, make radius R and roughly effectively the radius of the inscribed circle of the short side direction on image pickup plane is consistent.In near near the correction situation of (be axle) fixedly scaling multiplying power radius R=0, some is unfavorable from the angle of substantial image quantity, even but can guarantee to add wide angle also so that the less effect of size.

The focal length interval that needs to proofread and correct is divided into a plurality of focus areas.And, can be with carrying out correction with near substantially meet the following conditions the far-end in correction result's the situation of expression formula identical correcting value of taking the photograph in the focus area of cutting apart:

r′(ω)＝α·f·tanω

Yet in this case, the wide-angle side in the focus area of cutting apart has to a certain degree residual in the barrel-shaped distortion of the wide-angle side of the focus area of cutting apart.And, when the quantity in the zone of cutting apart increased, the needs of the necessary particular data of correction appearred keeping in recording medium extraly.Therefore, the quantity of increase institute cut zone is not preferred.Therefore, calculate in advance the one or more coefficients that are associated with each focal length in the focus area of cutting apart.Can be based on determining these coefficients by simulation or by the measurement of physical device.

Can calculate near the correcting value in the basic situation that satisfies the following correction result who the concerns far-end of taking the photograph in the focus area of cutting apart:

r′(ω)＝α·f·tanω

And can make it become final correcting value by the coefficient that multiply by uniformly each focal length for this correcting value.

In addition, when not having distortion in the picture that obtains by the imaging (forming picture) to the object of unlimited distance, below relation establishment:

f＝y/tanω。

Here, y represents that picture point is from the height (image height degree) of optical axis, f represents the focal length of imaging system (zoom-lens system among the present invention), and ω represents to be connected to object point direction corresponding to the picture point of position of y with respect to the angle (object half image angle) of optical axis with center from the image pickup plane.

When having barrel-shaped distortion in imaging system, relation becomes

f＞y/tanω。

In other words, as the focal distance f of imaging system and image height degree y fixedly the time, it is very large that the value of ω becomes.

(digital camera)

The foregoing electronic image pickup apparatus that can receive or pick up for use electronic image pickup device (for example CCD) picture of the object that is formed by zoom lens according to zoom lens of the present invention, for example, particularly digital camera or video camera.The execution mode of this image pick-up device will be described below.

Figure 36 is concept map according to the structure of the digital camera of wherein above-mentioned zoom-lens system being incorporated into photographing optical system 141 of the present invention to Figure 38.Figure 36 is the front view that the outward appearance of digital camera 140 is shown, and Figure 37 is the rearview of digital camera 140, and Figure 38 is the schematic cross sectional view that the structure of digital camera 140 is shown.In the situation of this example, digital camera 140 comprises: have the photographing optical system 141 of taking light path 142, the finder optical system 143 with view finder light path 144, shutter release button 145, photoflash lamp 146, liquid crystal display 147, focal length change button 161 and change switch 162 etc. is set, when pressing the shutter release button 145 on the top that is arranged in digital camera 140, with pressing synchronously of shutter release button 145, photographing optical system 141 (for example optical path-deflecting zoom-lens system in the first execution mode) is taken pictures.The object picture that photographing optical system 141 forms is formed on the image pickup surface of CCD 149 via the optical low-pass filter that has applied wavelength region may restriction coating on it and protective glass C.By processing unit 151, will be presented on the liquid crystal display 147 as electronic image as the object picture of light-receiving by CCD 149, this liquid crystal display 147 is arranged on the back side of digital camera 140.And tape deck 152 is connected to processing unit 151, and it also can record captured electronic image.Tape deck 152 can arrange discretely with processing unit 151, perhaps can record to form tape deck 152 by writing electronically floppy disk, storage card or MO etc.And, video camera can be formed and wherein be furnished with the silver salt video camera that silver salt film replaces CCD 149.

In addition, view finder objective lens optical system 153 is arranged on the view finder light path 144.The object that view finder objective lens optical system 153 forms looks like to be formed on the field frame (frame) 157 as the Porro prism 155 of erect image element.At the dorsal part of Porro prism 155, be furnished with the eyepiece optical system 159 that erect image is directed to beholder's eyeball.Exiting side at eyepiece optical system 159 is furnished with cap member 150.

Because the digital camera 140 that consists of in such a way has according to photographing optical system 141 of the present invention, so have the high zoom ratios of three convergent-divergent multiplying powers.Because zoom lens have high optical property, so can realize the degree of depth cheap digital camera as thin as a wafer.

Although plane-parallel plate is used as the cap member 150 in the video camera shown in Figure 38, also can omit it.

(internal circuit configuration)

Figure 39 is the structured flowchart of internal circuit of the critical piece of digital camera 140.In the following description, above-mentioned processing unit 151 for example comprises CDS/ADC section 124, temporary storage 117 and image processing part 118, and storage device 152 for example is comprised of storage medium section 119.

As shown in Figure 39, digital camera 140 comprises operating portion 112, is connected to the control part 113 of operating portion 112, the temporary storage 117 of control signal output port and the image that are connected to control part 113 via bus 114 and bus 115 form drive circuit 116, image processing part 118, storage medium section 119, display part 120 and configuration information storage part 121.

Temporary storage 117, image processing part 118, storage medium section 119, display part 120 and configuration information storage part 121 are constructed to can be via bus 122 mutual input and output data.And CCD 149 and CDS/ADC section 124 are connected to image and form drive circuit 116.

Operating portion 112 comprises various load buttons and switch, and is to notify the circuit via the event information of these load buttons and switch input from outside (by the user of digital camera) to control part.

Control part 113 is CPU (CPU), and has not shown built-in computer program storage.Control part 113 is computer programs of storing according in this computer program memory, controls the circuit of whole digital camera 140 when receiving the video camera user via the instruction of operating portion 112 inputs and ordering.

CCD 149 receives the object picture via photographing optical system 141 formation according to the present invention as light.CCD 149 is following image pick-up element: it is formed by image, and drive circuit 116 drives and control, and will be converted to the signal of telecommunication and output to CDS/ADC section 124 for the amount of the light of each pixel of object picture.

CDS/ADC section 124 is following circuit: it amplifies the signal of telecommunication from CCD 149 inputs, and execution analog/digital conversion, and will be only output to temporary storage 117 through the original image data (uncorrected data is hereinafter referred to as " initial data ") of amplifying and be converted to numerical data.

Temporary storage 117 is the buffers that for example comprise SDRAM (Synchronous Dynamic Random Access Memory), and is that interim storage is from the storage device of the initial data of CDS/ADC section 124 outputs.Image processing part 118 is following circuit: it reads in the temporary storage 117 initial data of storage in the initial data of storage or the storage medium section 119, and carry out electronically various images based on the image quality parameter of control part 113 appointments and process, comprise distortion correction.

Storage medium section 119 is recording mediums of form by the card that comprises flash memory or rod of for example removably installing.Storage medium section 119 is control circuits of device, wherein record and maintain the initial data of passing on from temporary storage 117 and carried out the view data that image is processed image processing part 118 in cassette flash memory and bar type flash memory.

Display part 120 comprises liquid crystal display, and is the circuit that shows image and actions menu in liquid crystal display.Configuration information storage part 121 comprises the RAM section of the image quality parameter that the ROM section of pre-stored various image quality parameters wherein and storage are selected by the input operation on the operating portion 112 the image quality parameter that reads from ROM section.Configuration information storage part 121 is control to the input of memory with from the circuit of the output of memory.

The digital camera 140 of structure has according to photographing optical system 141 of the present invention by this way, this photographing optical system 141 has the imaging performance of stabilizer pole in whole convergent-divergent multiplying power zone by high convergent-divergent multiplying power in the structure with enough wide-angle zones and miniaturization.Therefore, can realize high-performance, small size and wide visual angle.And, can and take the photograph far-end in wide-angle side and carry out rapidly focusing operation.

Next, in Figure 40 A, Figure 40 B and Figure 40 C, show as wherein being built-in with flexing of the present invention (vending) variable-power optical system with the phone as the example of the information processor of photographic optical system, particularly hold portative portable phone.Figure 40 A is the front view of portable phone 400, and Figure 40 B is the end view of portable phone 400, and Figure 40 C is the profile of photographic optical system 405.To as shown in Figure 40 C, portable phone 400 comprises microphone section 401, loud speaker section 402, input dial section 403, monitor 404, photographic optical system 405, antenna 406 and processing unit such as Figure 40 A.

Here, microphone section 401 is used for input operation person's voice as information.Loud speaker section 402 is used for output communication the other side's voice.Input dial section 403 is used for operator's input message.Monitor 404 is used for the photographs of display operation person and communication counterpart and the information of telephone number for example.Antenna 406 is used for the sending and receiving of executive communication electric wave.The processing unit (not shown) is used for the processing of carries out image information, the communication information and input signal etc.

Here, monitor 404 is liquid crystal indicators.And in the drawings, the position of arranging each structural detail specifically is not limited to the position among the figure.This photographic optical system 405 has the image pick-up element chip 162 of the objective lens optical system 212 that is made of the flexing variable-power optical system according to the present invention that is arranged in the light path of photography 407 (it is in the drawings by simple) and receiver body image.These including components thereins are in portable phone 400.

Here, optical low-pass filter F additionally is installed integrally forming on the image pick-up element chip 162 of image pickup units 160.Image pickup units 160 can be inserted by a contact of the rear end of the lens barrel 213 of object lens 212 with engaging.Therefore, needn't carry out center adjustment or the face of adjustment gap between object lens 212 and image pick-up element 162, assembling is processed very simple thus.In addition, be arranged in the end (it omits in the drawings) of lens barrel 213 for the protection of the protective glass 214 of object lens 212.The driving mechanisms of the zoom lens in the lens frame 213 etc. are not shown in the drawings.

The object picture that receives at electronic image pickup device chip 162 is input to not shown image processing apparatus via terminal.In addition, the object picture finally is presented on the monitor of monitor 404 or communication counterpart as electronic image, perhaps on the two.And, in processing unit, comprise signal processing function.According to this function, sending to communication counterpart in the situation of image, the information of the object picture that will receive at electronic image pickup device chip 162 is converted to the signal that can send.

As previously mentioned, the present invention can provide the miniaturization that has as required enough zoom ratios and optical characteristics zoom lens.Therefore, the present invention goes for the miniaturization image pick-up device.

According to the present invention, a kind of zoom lens can be provided, it is conducive to make its miniaturization and has as required enough zoom ratios and optical characteristics.In addition, the present invention also can provide the image pick-up device that is equipped with this zoom lens.

Claims

1. image pick-up device, this image pick-up device comprises from its thing side in order:

Zoom lens; With

Image pick-up element, it is converted to the signal of telecommunication with the optical image that described zoom lens form, wherein

Described zoom lens comprise from the thing side in order: have negative refraction power the first lens unit, have the second lens unit of negative refraction power, the 4th lens unit that has the 3rd lens unit of positive refracting power and have negative refraction power,

During from wide-angle side to the zoom of taking the photograph far-end, distance between described first lens unit and described the second lens unit changes, distance between described the second lens unit and described the 3rd lens unit changes, and the distance between described the 3rd lens unit and described the 4th lens unit changes, distance between described the second lens unit and described the 3rd lens unit is being taken the photograph far-end less than in wide-angle side, and

Described first lens unit comprises the reflecting surface that makes optical path-deflecting, and, described zoom lens meet the following conditions (1):

-100<fg4/ihw<-2.5 (1)

Wherein fg4 is the focal length of described the 4th lens unit, and ihw is the maximum image height degree in wide-angle side, and wherein, if the effective image picking region of described image pick-up element is variable, then ihw is the maximum in its value that can take.

2. image pick-up device according to claim 1, wherein, described the 4th lens unit is being taken the photograph far-end than in the more close thing side of wide-angle side, and meet the following conditions (2):

1.01<βg4(t)/βg4(w)<2.0 (2)

Wherein β g4 (w) focuses under the state on the object at maximum distance place on the optical axis described the 4th lens unit in the horizontal convergent-divergent multiplying power of wide-angle side at described zoom lens, and β g4 (t) focuses under the state on the object at maximum distance place described the 4th lens unit at described zoom lens to take the photograph the horizontal convergent-divergent multiplying power of far-end.

3. image pick-up device according to claim 1, wherein, described zoom lens meet the following conditions (3):

-0.35<Dg4/fg4<-0.0005 (3)

Wherein Dg4 be described the 4th lens unit on optical axis from its thing side surface to its thickness as side surface.

4. image pick-up device according to claim 1, wherein, described zoom lens meet the following conditions (4):

0.5<enp(w)/fw<1.8 (4)

Wherein enp (w) be wide-angle side on optical axis from the thing side plane of refraction of described first lens unit to the distance that enters Pupil, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

5. image pick-up device according to claim 1, wherein, described zoom lens meet the following conditions (5):

0.001<fg4/fg1<30.0 (5)

Wherein, fg1 is the focal length of described first lens unit.

6. image pick-up device according to claim 1, wherein, described first lens unit comprises reflecting prism, this reflecting prism comprises described reflecting surface, thing side plane of refraction and picture side plane of refraction, and reflecting surface add up to one.

7. image pick-up device according to claim 1, wherein, described first lens unit comprises reflecting prism, this reflecting prism comprises described reflecting surface, thing side plane of refraction and picture side plane of refraction, and described reflecting prism meet the following conditions (6):

0.5<Dpr/fw<2.0 (6)

Wherein, Dpr be thing side plane of refraction along optical axis from described reflecting prism to its optical path length as the side plane of refraction, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

8. image pick-up device according to claim 1, wherein, described first lens unit comprises reflecting prism, this reflecting prism comprises described reflecting surface, thing side plane of refraction and picture side plane of refraction, and described reflecting prism meet the following conditions (10):

1.70<nd(pr)<2.3 (10)

Wherein, nd (pr) is that described reflecting prism in the described first lens unit is to the refractive index of d line.

9. image pick-up device according to claim 1, wherein, during from wide-angle side to the zoom of taking the photograph far-end, it is fixing that described first lens unit keeps, described the second lens unit moves, and described the 3rd lens unit is by taking the photograph far-end than moving in the mode of the more close thing side of wide-angle side.

10. image pick-up device according to claim 1, wherein, during from wide-angle side to the zoom of taking the photograph far-end, described the second lens unit is at first towards the picture side shifting, and its moving direction of reversing thereafter is with towards the thing side shifting.

11. image pick-up device according to claim 1, wherein, during the focusing operation from remote object to in-plant object, described the 4th lens unit is towards the picture side shifting.

12. image pick-up device according to claim 1, wherein, described the 3rd lens unit altogether comprises two positive element and altogether comprises a negative lens element, and in the lens element in described the 3rd lens unit at least two are bonded together.

13. image pick-up device according to claim 1, wherein, described the second lens unit is comprised of negative lens element and positive element from the thing side in order, and described negative lens element and described positive element are bonded together.

14. image pick-up device according to claim 1, wherein, described the 4th lens unit comprises two or lens element still less altogether.

15. image pick-up device according to claim 1, wherein, described the 4th lens unit comprises the negative lens that the most close picture side is arranged, and described the 4th lens unit meet the following conditions (7) and (8):

1.4<nd(g4i)<1.7 (7)

55.0<νd(g4i)<100 (8)

Wherein, nd (g4i) be the lens of the most close picture side in described the 4th lens unit to the refractive index of d line, and ν d (g4i) is the Abbe number of the lens of the most close picture side in described the 4th lens unit.

16. image pick-up device according to claim 1, wherein, described zoom lens comprise the aperture diaphragm between the picture side surface that looks like side surface and described the 3rd lens unit that is arranged in described the second lens unit, and described zoom lens are four unit zoom lens.

17. image pick-up device according to claim 1, wherein, described zoom lens meet the following conditions (9):

1.8<ft/fw<6.5 (9)

Wherein, fw be whole zoom-lens system at the focal length of wide-angle side, and ft is that whole zoom-lens system is being taken the photograph the focal length of far-end.

18. image pick-up device according to claim 1, wherein, described image pick-up device comprises image transitions section, and this image transitions section processes the signal of telecommunication that expression is comprised the image of the distortion that described zoom lens cause by image and is converted to the picture signal of having proofreaied and correct distortion.

19. image pick-up device according to claim 1, wherein, described image pick-up device comprises image transitions section, and this image transitions section processes the signal of telecommunication that expression is comprised the image of the convergent-divergent multiplying power chromatic aberation that described zoom lens cause by image and is converted to the picture signal of having proofreaied and correct convergent-divergent multiplying power chromatic aberation.

20. zoom lens, these zoom lens comprise from its thing side in order: have negative refraction power the first lens unit, have the second lens unit of negative refraction power, the 4th lens unit that has the 3rd lens unit of positive refracting power and have negative refraction power, wherein

Described first lens unit comprises: make optical path-deflecting reflecting surface, be arranged in the negative lens element with negative refraction power on the thing side of described reflecting surface and be arranged in described negative lens element as the convex surface with positive refracting power on the side.

21. zoom lens according to claim 20, wherein, described zoom lens meet the following conditions (19):

0.5<Pg2/Pg1<20 (19)

Wherein, Pg1 is the refracting power of described first lens unit, and Pg2 is the refracting power of described the second lens unit, and refracting power is the inverse of focal length.

22. zoom lens according to claim 20, wherein, the described negative lens element in the described first lens unit has concave surface towards the shape of picture side.

23. zoom lens according to claim 22, wherein, the recessed of the described negative lens element in the described first lens unit is aspheric surface as side surface.

24. zoom lens according to claim 22, wherein, described zoom lens meet the following conditions (14):

0.5<(rlno+rlni)/(rlno-rlni)<2 (14)

Wherein, rlno is the paraxial radius of curvature of the thing side surface of the described negative lens element in the described first lens unit, and rlni is the paraxial radius of curvature of the picture side surface of the described negative lens element in the described first lens unit.

25. zoom lens according to claim 20, wherein,

Described first lens unit has the convex lens surface than the more close picture side of described reflecting surface.

26. zoom lens according to claim 25, wherein,

Described first lens unit comprises a positive element, and this positive element has the described convex lens surface of the picture side that is arranged in described reflecting surface.

27. zoom lens according to claim 26, wherein, described zoom lens meet the following conditions (15):

-1.0<(rlpo+rlpi)/(rlpo-rlpi)<1.0 (15)

Wherein, rlpo is the paraxial radius of curvature of the thing side surface of the described positive element in the described first lens unit, and rlpi is the paraxial radius of curvature of the picture side surface of the described positive element in the described first lens unit.

28. zoom lens according to claim 26, wherein, described zoom lens meet the following conditions (16):

-20.0<P1p/Pgl<-0.5 (16)

Wherein, Plp is the refracting power of the described positive element in the described first lens unit, and Pgl is the refracting power of described first lens unit, and refracting power is the inverse of focal length.

29. zoom lens according to claim 26, wherein, described zoom lens meet the following conditions (17):

-5.0<P1p/Pg2<-0.03 (17)

Wherein, Plp is the refracting power of the described positive element in the described first lens unit, and Pg2 is the refracting power of described the second lens unit, and refracting power is the inverse of focal length.

30. zoom lens according to claim 29, wherein, described first lens unit is comprised of described negative lens element, the reflecting element with described reflecting surface and described positive element from the thing side in order.

31. zoom lens according to claim 30, wherein, described zoom lens meet the following conditions (11):

0.03<D1p/fw<2.0 (11)

Wherein, Dlp is the thickness of described positive element on optical axis in the described first lens unit, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

32. zoom lens according to claim 30, wherein, described reflecting element is the reflecting prism with thing side plane of refraction and picture side plane of refraction.

33. zoom lens according to claim 32, wherein, described zoom lens meet the following conditions (13):

0.5<Dpr/fw<2.0 (13)

Wherein, Dpr be thing side plane of refraction along optical axis from described reflecting prism to the optical path length of picture side plane of refraction, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

34. zoom lens according to claim 32, wherein, described zoom lens meet the following conditions (12):

0.03<D1npr/fw<1.0 (12)

Wherein, Dlnpr is the distance on optical axis between described negative lens element in the described first lens unit and the described prism, and fw is that whole zoom-lens system is at the focal length of wide-angle side.

35. zoom lens according to claim 30, wherein, described negative lens element in the described first lens unit is the single lens element, described positive element in the described first lens unit is the single lens element, and the described reflecting element in the described first lens unit is reflecting prism, and described reflecting prism comprises a plurality of refractive surfaces.

36. zoom lens according to claim 20, wherein, during from wide-angle side to the zoom of taking the photograph far-end, it is fixing that described first lens unit keeps, described the second lens unit moves, and described the 3rd lens unit is by taking the photograph far-end than moving in the mode of the more close thing side of wide-angle side.

37. zoom lens according to claim 36, wherein, from wide-angle side during take the photograph the far-end zoom, described the second lens unit is at first towards the picture side shifting, its moving direction of reversing thereafter is with towards the thing side shifting.

38. zoom lens according to claim 36, wherein, during from wide-angle side to the zoom of taking the photograph far-end, described the 4th lens unit by so that the mode that the distance between described the 4th lens unit and described the 3rd lens unit changes move.

39. zoom lens according to claim 36, wherein, the distance between described the 3rd lens unit and described the 4th lens unit is being taken the photograph far-end greater than in wide-angle side.

40. zoom lens according to claim 36, wherein, described the 4th lens unit is being taken the photograph the far-end ratio in the more close thing side of wide-angle side.

41. zoom lens according to claim 20 wherein, during the focusing operation from remote object to in-plant object, move than more close any one lens unit with negative refraction power as side of described reflecting surface.

42. zoom lens according to claim 20, wherein, during the focusing operation from remote object to in-plant object, described the 4th lens unit is towards the picture side shifting.

43. zoom lens according to claim 20, wherein, described zoom lens comprise the aperture diaphragm between the picture side surface that looks like side surface and described the 3rd lens unit that is arranged on described the second lens unit, and described zoom lens are four unit zoom lens.

44. zoom lens according to claim 20, wherein, described the second lens unit is comprised of negative lens element and positive element, described the 3rd lens unit is comprised of two positive element and a negative lens element, and described the 4th lens unit is by two or still less lens element form altogether.

45. zoom lens according to claim 20, wherein, described zoom lens meet the following conditions (18):

2.3<ft/fw<6 (18)

46. zoom lens according to claim 20, wherein, described zoom lens are provided with glare stop in light path.

47. zoom lens according to claim 20 wherein, are coated with anti-reflection coating at least one in the surface of the lens that comprise in the described zoom lens.

48. image pick-up device, this image pick-up device comprises zoom lens according to claim 20 and is arranged in image pick-up element on the picture side of described zoom lens that this image pick-up element is converted to the signal of telecommunication with the optical image that described zoom lens form.

49. described image pick-up device according to claim 48, wherein, described image pick-up device is equipped with image transitions section, and this image transitions section processes the signal of telecommunication that expression is comprised the image of the distortion that described zoom lens cause by image and is converted to the picture signal of having proofreaied and correct distortion.

50. described image pick-up device according to claim 48, wherein, described image pick-up device is equipped with image transitions section, and this image transitions section processes the signal of telecommunication that expression is comprised the image of the convergent-divergent multiplying power chromatic aberation that described zoom lens cause by image and is converted to the picture signal of having proofreaied and correct convergent-divergent multiplying power chromatic aberation.