CN106054361A - Optical system and camera device - Google Patents

Abstract

The objective of the invention lies in providing a small-size and light optical system which can achieve height chromatic aberration correction and still can maintain good imaging performance during temperature environment changes, and also providing a camera device. In order to achieve the above purposes, the optical system is characterized in that the the system is provided with at least one group of lenses comprising a diffraction surface, wherein any one group of lenses comprise a first lens which is the same in overall symbol as the lens group and has the maximum refractive power meeting a specified conditional expression, and an i-th lens which is the same in overall symbol as the lens group and has the maximum refractive power meeting a specified conditional expression.

Description

Optical system and camera head

Technical field

The present invention relates to optical system and camera head, more particularly, it relates to use in digital camera or DV etc. The optical system being suitable in the camera head of solid-state imager and the camera head possessing this optical system.

Background technology

At present, digital camera, DV etc. have employed the camera head of solid-state imager and popularized.As The image pickup optical system used in this this camera head, the varifocal optical system that can change focal length is widely applied. In varifocal optical system, change focal length by changing the interval of battery of lens.At this moment, incide each battery of lens ray height or Angle of incidence changes, thus axially each aberration such as chromatic aberration or multiplying power chromatic aberration changes the most therewith.In order to suppress these The variation of each aberration, realizes high imaging performance at whole zooming range, simultaneously in order to suppress varifocal optical system maximization, Re-quantization, the optical design to height proposes requirement.

Therefore, propose the diffraction optical element with having the optical characteristics different from dioptric system in recent years to come in fact The now varifocal optical system of the chromatic aberration correction of height.Such as, in the varifocal optical system that patent documentation 1 is recorded, used in the past On the basis of the low chromatic dispersion material of abnormality of chromatic aberration correction, by using diffraction optical element, it is suppressed that needed for aberration correction The increase of number of lenses, be simultaneously achieved and cope with the solid-state image pickup that can carry out 1,000,000 pixel above high-resolution shootings The high imaging performance of element.

For this varifocal optical system, except slr camera, reflector-free interchangeable lenses camera, digital camera etc. are used Beyond the portable camera head in family, also as vehicle-mounted camera head, monitoring camera head etc. at car body or building etc. The image pickup optical system installing fixed pattern camera head fixing, special-purpose uses is installed be widely applied.And then, Imaging performance height, miniaturization, the brightest varifocal optical system that F value is little are all proposed by any one purposes Requirement.

Prior art literature

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2013-134304 publication

Summary of the invention

The problem that invention is to be solved

But, the refractive power of each optical module constituting image pickup optical system produces change because of variations in temperature.Therefore, ring When border temperature is big with temperature (room temperature) difference when designing, the optical property of this image pickup optical system also can change.Above-mentioned Unusual low chromatic dispersion material is compared with other glass materials, and the change of refractive power has the tendency of the change aggravation along with ambient temperature, For comprising the optical system of unusual low chromatic dispersion material, especially for the zoom light comprising unusual low chromatic dispersion material For system, the probability causing focal position or back focusing amount to change therewith after variation of ambient temperature strengthens.Further, refractive power When the lens that power is strong are made up of unusual low chromatic dispersion material, the variation of spherical aberration etc. has inclining of the change aggravation along with ambient temperature To.In varifocal optical system, especially in zoom lens, focal position or back focusing amount produce change because of the change of ambient temperature During change, imaging performance will be remarkably decreased.

In the above-mentioned camera head installing fixed pattern, it is mostly to use zoom lens as image pickup optical system, and is mostly The environment that variation of ambient temperature is big uses.For the camera head of fixed pattern is installed, when putting, have adjusted shooting Angle, do not possess that the machine of automatic focusing function also more existence.Therefore, it may appear that because ambient temperature causes subject image Profile become the distinctest, it is impossible to realize the situation of purposes that the camera head of monitoring these installation fixed patterns such as grade is undertaken.

While it is an object of the invention to provide miniaturization and lightweight and realizing chromatic aberration correction highly, ambient temperature It also is able to maintain optical system and the camera head of good imaging performance during change.

The method of solution problem

To achieve these goals, the present invention provides a kind of optical system, it is characterised in that has least one set and comprises and spread out Penetrating the battery of lens in face, the most any one group in the battery of lens that will comprise this diffraction surfaces is saturating as specifying of comprising this diffraction surfaces Mirror group, in this battery of lens specified comprising this diffraction surfaces, will have the refractive power shown by the battery of lens entirety specified with this In the lens of the refractive power of power same-sign, the lens of refractive power maximum are as the first lens, and in this battery of lens specified, By the first lens described in the lens of the refractive power of refractive power same-sign having shown by the battery of lens entirety specified with this When any one lens in addition are as lens, described first lens meet following conditional (1), and described lens are full Conditional (2) under being enough to.

dndtP1×10⁶>-5…(1)

Ndi≥-0.014×νdi+2.5…(2)

Wherein, " dndt " be more than 20 DEG C the temperature range of less than 40 DEG C for wavelength 632.8nm light, vacuum The temperature coefficient (absolute dn/dT) of the absolute index of refraction of middle lens, " dndtP1 " is the dndt of described first lens, " Ndi " is the described lens refractive indexs for d line, and " ν di " is the described lens Abbe numbers for d line, and " d line " is 587.56nm the light of wavelength.

Further, the present invention provides a kind of camera head, it is characterised in that possesses the optical system of the invention described above and incites somebody to action The optical imagery that this optical system is formed in the image planes side of this optical system is converted to the imaging apparatus of the signal of telecommunication.

The effect of invention

According to the present invention it is possible to while miniaturization and lightweight being provided and realizing chromatic aberration correction highly, environment temperature It also is able to maintain optical system and the camera head of good imaging performance during degree change.

Accompanying drawing explanation

Fig. 1 is the profile of the lens composition example of the optical system wide-angle side representing embodiments of the invention 1.

Fig. 2 is the profile of the lens composition example of the optical system telescope end representing embodiment 1.

Fig. 3 is spherical aberration diagram, the astigmatism figure during infinity focusing of the optical system telescope end of embodiment 1 and distorts picture Difference figure.

Fig. 4 is spherical aberration diagram, the astigmatism figure during infinity focusing of the optical system wide-angle side of embodiment 1 and distorts picture Difference figure.

Fig. 5 is the profile of the lens composition example of the optical system wide-angle side representing embodiments of the invention 2.

Fig. 6 is the profile of the lens composition example of the optical system telescope end representing embodiment 2.

Fig. 7 is spherical aberration diagram, the astigmatism figure during infinity focusing of the optical system telescope end of embodiment 2 and distorts picture Difference figure.

Fig. 8 is spherical aberration diagram, the astigmatism figure during infinity focusing of the optical system wide-angle side of embodiment 2 and distorts picture Difference figure.

Fig. 9 is the profile of the lens composition example of the optical system wide-angle side representing embodiments of the invention 3.

Figure 10 is the profile of the lens composition example of the optical system telescope end representing embodiment 3.

Figure 11 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system telescope end of embodiment 3 Aberration diagram.

Figure 12 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system wide-angle side of embodiment 3 Aberration diagram.

Figure 13 is the profile of the lens composition example of the optical system wide-angle side representing embodiments of the invention 4.

Figure 14 is the profile of the lens composition example of the optical system telescope end representing embodiment 4.

Figure 15 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system telescope end of embodiment 4 Aberration diagram.

Figure 16 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system wide-angle side of embodiment 4 Aberration diagram.

Figure 17 is the profile of the lens composition example of the optical system wide-angle side representing embodiments of the invention 5.

Figure 18 is the profile of the lens composition example of the optical system telescope end representing embodiment 5.

Figure 19 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system telescope end of embodiment 5 Aberration diagram.

Figure 20 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system wide-angle side of embodiment 5 Aberration diagram.

Figure 21 is the profile of the lens composition example of the optical system wide-angle side representing embodiments of the invention 6.

Figure 22 is the profile of the lens composition example of the optical system telescope end representing embodiment 6.

Figure 23 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system telescope end of embodiment 6 Aberration diagram.

Figure 24 is spherical aberration diagram, astigmatism figure and the distortion during infinity focusing of the optical system wide-angle side of embodiment 6 Aberration diagram.

Figure 25 is the figure of the temperature change of the back focus of the optical system representing embodiment 1.

Figure 26 is the figure of the temperature change of the back focus of the optical system representing comparative example.

The explanation of symbol

1G ... the first battery of lens, 2G ... the second battery of lens, 3G ... the 3rd battery of lens, 4G ... the 4th battery of lens, CG ... guard shield Glass, IMG ... image planes

Detailed description of the invention

Hereinafter, the optical system of the present invention and the embodiment of camera head are illustrated.

1, optical system

1-1, the basic composition of optical system

The optical system of present embodiment is characterised by, has the battery of lens that least one set comprises diffraction surfaces, will comprise In the battery of lens of this diffraction surfaces the most any one group is as the battery of lens specified, in this battery of lens specified, will have with The lens conduct that in the lens of the refractive power of the refractive power same-sign shown by battery of lens entirety that this is specified, refractive power is maximum First lens, and in this battery of lens specified, will have the identical symbol of refractive power shown by the battery of lens entirety specified with this Number refractive power lens described in any one lens beyond the first lens as lens time, after the first lens meet The conditional (1) stated, lens meet conditional described later (2).Hereinafter, the composition of this optical system is illustrated.

1-1-1, comprise the battery of lens of diffraction surfaces

First, the battery of lens comprising diffraction surfaces is illustrated.The battery of lens comprising diffraction surfaces refers to, is constituting these lens In the optical module of group, at least optical surface of any one optical module is diffraction surfaces.

Here, diffraction surfaces has the diffraction grating structure of the phase function defined represented by following formula.For example, it is possible to Cutting method, photoetching process, molding method etc. are utilized to form diffraction light at the optical surface of the optical modules such as glass lens, plastics lens Grid structure, thus obtain diffraction optical element.And, it is also possible to the optical surface (sphere/aspheric surface) at above-mentioned optical module sets Put one or more layers the resin bed with diffraction grating structure, thus utilize this resin bed to be formed at optical surface and there is diffraction light The multilayer diffraction optical element of grid structure.In the present invention, it is referred to as comprising diffraction by the battery of lens comprising this diffraction optical element The battery of lens in face.

$\mathrm{\φ}\left(h\right)=\frac{m}{\mathrm{\λ}}(C1\·h^2+C2\·h^4+C3\·h^6+C4\·h^8)$

In above-mentioned formula,H () is phase function, " m " is diffraction progression, and " λ " is standardized wavelength.Further, " C1 ", " C2 ", " C3 ", " C4 " are each diffraction surfaces coefficients, and " h " is the length in same radial from optical axis.Additionally, standardized wavelength is Wavelength in the use wave-length coverage of this optical system, for example, it is preferable to the wavelength in visible wavelength range.

As diffraction optical element, it is possible to use only there is the monolayer diffraction of above-mentioned diffraction surfaces at the mask contacted with air layer Optical element.Further, in addition to the multilayer diffraction optical element of above-mentioned form, for example, it is also possible to use cemented lens Composition surface is as above-mentioned diffraction surfaces etc., define the stacked of diffraction surfaces a glass material layer with other glass material interlayers Multilayer diffraction optical element.Compared with monolayer diffraction optical element, can be bigger during employing multilayer diffraction optical element Wave-length coverage carries out good correction to chromatic aberration etc..Wherein, in multilayer diffraction optical element, glass material layer be not limited only to by The layer that optical glass material is constituted, it is also possible to be by optical glass such as optical plastics beyond optical element form material and constitute Layer.

Further, this diffraction surfaces can be sphere or aspheric surface.When diffraction surfaces is aspheric surface, it is possible to the optics of lesser number Assembly carries out the best correction to each aberrations such as chromatic aberrations.

The optical system of present embodiment has an above-mentioned battery of lens specified, thus with not there is the common folding of diffraction surfaces Penetrate optical system to compare, it is possible to few optical module, chromatic aberration etc. is carried out good correction.Therefore, this optical system is being sought System miniaturization and light-weighted while, it is possible to achieve height chromatic aberration correction.

Further, when this optical system uses the composition comprising diffraction surfaces, the temperature characterisitic that optical system is overall can be improved. Specifically, when optical system has diffraction surfaces, as mentioned above, it is possible to few optical module, chromatic aberration etc. is carried out good Correction.Therefore, it is possible to what minimizing was made up of effective in the correction of chromatic aberration etc. but temperature characterisitic difference glass material, such as, The number of the optical module being made up of unusual low chromatic dispersion material etc..And then, the above-mentioned battery of lens specified is formed and comprises following description The first lens meeting conditional (1) and during the composition of the lens that meet conditional (2), optical system is overall at environment Good imaging performance can also be maintained during variations in temperature.

Here, the above-mentioned refractive power shown by battery of lens entirety specified can be plus or minus, to the most particularly limit Fixed, but correction based on chromatic aberration etc. becomes the best viewpoint, preferably has positive refractive power.

Further, when this optical system comprises multiple diffraction surfaces, preferably each diffraction surfaces is arranged respectively at different lens In group.Such as, varifocal optical system has multiple battery of lens, changes focal length by changing the interval of each battery of lens.Therefore, root Position according to each battery of lens is different, and maximally efficient configuration when being corrected each aberrations such as chromatic aberration with diffraction surfaces can Different.Therefore, when varifocal optical system comprises multiple diffraction surfaces, for the sight obtaining the higher optical system of imaging performance Point, preferably configures each diffraction surfaces in different battery of lens.

Additionally, in this optical system, at least one group of battery of lens comprising at least one diffraction surfaces, can have one Group or many groups comprise the battery of lens of a diffraction surfaces, it is possible to have one or more groups comprises the battery of lens of multiple diffraction surfaces.Have During the many groups of battery of lens comprising diffraction surfaces, the most any one group of battery of lens is the above-mentioned battery of lens specified, and both can be two Organize above battery of lens and be respectively the above-mentioned battery of lens specified, it is also possible to be that all battery of lens containing diffraction surfaces are the most above-mentioned The battery of lens specified.

1) lens are constituted

Secondly, the lens composition of the above-mentioned battery of lens specified is illustrated.This battery of lens specified is including at least above-mentioned First lens and two lens of above-mentioned lens, as long as comprising diffraction surfaces in the battery of lens that this is specified, just concrete to other Lens are constructed without particularly limiting.The optical surface of the first lens and/or lens can be above-mentioned diffraction surfaces, constitutes this and refers to The optical surface of the lens beyond the first lens of fixed battery of lens and lens can also be above-mentioned diffraction surfaces.For this appointment The concrete lens of battery of lens be constructed without particularly limiting, but for carrying out more preferable chromatic aberration correction, prevent this optics The maximization of system, re-quantization viewpoint, the number of lenses constituting this battery of lens specified is preferably more than 3 less than 6.

Further, the above-mentioned battery of lens specified preferably comprises the refractive power with the battery of lens entirety distinct symbols specified with this Lens.First battery of lens and lens have the folding of the refractive power same-sign shown by battery of lens entirety specified with this Luminous power.Therefore, when employing comprises the composition having with the first lens and the lens of the refractive power of lens distinct symbols, it is possible to The most each aberration such as correcting chromatic aberration, and also be able to utilization when variation of ambient temperature and have and the first lens and The lens of the refractive power of lens distinct symbols are offset aberration and suppress aberration to change.

2) the first lens

Secondly, the first lens are illustrated.First lens are to constitute one of above-mentioned optical module of battery of lens specified, It is the lens that refractive power is maximum in having the lens of refractive power of the battery of lens same-sign specified with this.That is, this is specified Refractive power shown by battery of lens entirety is timing, and the refractive power of the first lens is just, shown by the battery of lens entirety that this is specified Refractive power for time negative, the refractive power of the first lens is negative.First lens are to have the identical symbol of battery of lens entirety specified with this Number and the lens of refractive power of maximum, thus when variation of ambient temperature, if the optical characteristics of the first lens changes, The probability that then optical characteristics of this battery of lens specified changes therewith is big.Its result, the optical characteristics of this optical system Change the most therewith, when especially focal length, focal position, back focusing amount etc. change, it may appear that image planes cannot be accurately Imaging subject image, the significantly reduced problem of imaging performance.Therefore, in the optical system of present embodiment, by by One lens are set to meet the lens of conditional (1), as described later, it is possible to these the first lens that suppression variation of ambient temperature causes The change of optical characteristics, and the change of the focal length of this optical system, focal position, back focusing amount etc. can be suppressed, thus maintain High imaging performance.Additionally, for conditional (1), be described in detail following.

3) lens

Lens and the first lens are identical, are to constitute one of above-mentioned optical module of battery of lens specified, have and refer to this The refractive power of the fixed refractive power same-sign shown by battery of lens entirety.The refractive power of lens is less than the first lens, thus When variation of ambient temperature, even if the optical characteristics of these lens changes, it is also possible to suppress the above-mentioned battery of lens specified The change of optical characteristics.Further, by lens being set to meet the lens of conditional (2), as described later, it is possible to the best Carry out well the correction of chromatic aberration etc., thus obtain the optical system that imaging performance is high.Additionally, for conditional (2), also will be Below it is described in detail.

As long as lens have the refractive power with the refractive power same-sign shown by the above-mentioned battery of lens entirety specified, And be the lens beyond the first lens, to there is no particular limitation.But based on carrying out chromatic aberration etc. the most well Correction, obtains the higher optical system of imaging performance, and suppression simultaneously constitutes the viewpoint of the increase of the number of lenses of this battery of lens, and From the perspective of improving chromatic aberration, these lens are more preferably in having the lens of refractive power of above-mentioned same-sign Refractive power is only second to the lens of the first lens.That is, lens be preferably have with the above-mentioned battery of lens entirety specified shown by Refractive power same-sign refractive power lens in the second largest lens of refractive power (following, referred to as " the second lens ")

Wherein, in present embodiment, focal length and the refractive power of so-called lens refer to, even if these lens constitute cemented lens Time a part of, also assume that and be the simple lens that the two sides of these lens contacts with air layer and the value obtained, and use based on these lens The radius of curvature (R of each₁、R₂), the refractive index (n) of this lens material itself and the center thickness (tc) of these lens obtain Value.Specifically, the value that employing following formula is obtained.Additionally, refractive power is the inverse (1/f) of focal length (f).

$\frac{1}{f}=(n-1)\{\frac{1}{R_1}-\frac{1}{R_2}+\frac{tc(n-1)}{R_1{R}_{2}n}\}$

1-1-2, other lenses group

In this optical system, in addition to the above-mentioned battery of lens specified, it is possible to have do not comprise the battery of lens of diffraction surfaces. For not comprising the symbol of the refractive power of the battery of lens of diffraction surfaces, lens composition etc., there is no particular limitation, based on this optical system Optical characteristics required by system can be to use suitable form.

1-2, battery of lens constitute example

Secondly, the battery of lens composition example of this optical system is illustrated.This optical system both can be that focal length is fixed Single focus optical system, it is also possible to be the variable varifocal optical system of focal length.In the case of two kinds, concrete battery of lens is constituted Deng all, there is no particular limitation, but can enumerate following composition example.Additionally, the varifocal optical system of the present invention comprises change Zoom lens, zoom lens etc..

1-2-1, single focus optical system

When this optical system is single focus optical system, the various battery of lens structures such as two groups of compositions, three groups of compositions can be used Become, for battery of lens number, strong focus configuration, there is no particular limitation for the concrete lens composition etc. of each battery of lens.Such as, may be used From object side, it is followed successively by two groups of the battery of lens with negative refractive power and the battery of lens with positive refractive power is constituted to enumerate, The battery of lens with positive refractive power and two groups of compositions of battery of lens with positive refractive power it are followed successively by, from object from object side Side rises to be followed successively by be had the battery of lens of positive refractive power, has the battery of lens of positive refractive power and have the battery of lens of negative refractive power Three groups of compositions, are followed successively by from object side and have the battery of lens of positive refractive power, have the battery of lens of negative refractive power and having and just roll over Three groups of compositions of the battery of lens of luminous power, are followed successively by from object side and have the battery of lens of negative refractive power, have the saturating of positive refractive power Mirror group and there are three groups of compositions etc. of battery of lens of positive refractive power.

When using any one above-mentioned composition, based on above-mentioned viewpoint, it is preferably to have in the battery of lens of positive refractive power The most any one group is the above-mentioned battery of lens specified.Further, this list focus optical system possesses many groups and has the saturating of positive refractive power Mirror group, and when being set to the above-mentioned battery of lens specified by any one group therein, in this list focus optical system, preferably axially light The battery of lens with positive refractive power that line passes through with maximum beam diameter is the above-mentioned battery of lens specified.By at axial ray Arranging diffraction surfaces with in the battery of lens with positive refractive power that maximum beam diameter passes through, the light for each wave-length coverage divides Can not correct each aberration maximally efficiently.

1-2-2, varifocal optical system

When this optical system is varifocal optical system, as long as configuring multiple battery of lens, and then become to telescope end from wide-angle side Focal length can be changed by changing the interval between each battery of lens, then for the number of battery of lens or strong focus configuration, each time burnt Just there is no particular limitation in the action etc. of each battery of lens when the concrete lens composition of mirror group, zoom.

Further, for this varifocal optical system, based on the viewpoint identical with during single focus optical system, it is also preferred that just have In the battery of lens of refractive power the most any one group is the above-mentioned battery of lens specified.Further, this varifocal optical system possesses many groups There is the battery of lens of positive refractive power, using therein any one group as the above-mentioned battery of lens specified time, in this varifocal optical system In, the battery of lens with positive refractive power that preferably axially light passes through with maximum beam diameter is the above-mentioned battery of lens specified. By arranging diffraction surfaces, for each ripple in the battery of lens with positive refractive power that axial ray passes through with maximum beam diameter The light of long scope can correct each aberration respectively maximally efficiently.But in varifocal optical system, generally, in wide-angle side and prestige The battery of lens that far-end axial ray passes through with maximum beam diameter is different.Therefore, color is made based at whole zooming range The correction of each aberration headed by aberration becomes good viewpoint, more preferably passes through with maximum beam diameter at wide-angle side axial ray The battery of lens with positive refractive power and the far-end axial ray that is visible with what maximum beam diameter passed through, there is positive refractive power Battery of lens comprises diffraction surfaces respectively.During additionally, have the battery of lens that many groups comprise diffraction surfaces, any one group of lens of at least a part of which Group is the above-mentioned battery of lens specified, and comprises above-mentioned first lens and lens.But, at telescope end subject figure As ratio in wide-angle side greatly, thus compared with wide-angle side, imaging performance can be made by the deviation of focal position etc. or the variation of each aberration Become big impact.Therefore, preferably axial ray had the saturating of positive refractive power with what maximum beam diameter passed through at telescope end Mirror group is set to the above-mentioned battery of lens specified.Hereinafter, the concrete composition example of several varifocal optical system is enumerated.

1) two groups of compositions

When this optical system is the varifocal optical system that two groups are constituted, it is preferably provided with least one set and comprises above-mentioned diffraction surfaces There is the battery of lens of positive refractive power, and make each battery of lens relative movement, thus from wide-angle side to telescope end zoom time can change First battery of lens and the interval of the second battery of lens.For example, it is possible to formed to possess to be followed successively by from object side, there is negative refractive power First battery of lens and comprise two groups of compositions of positive negative of second battery of lens with positive refractive power of diffraction surfaces.Now, from wide Angle end, when telescope end zoom, preferably makes the first battery of lens and/or the second battery of lens move, so that the first battery of lens and second The interval of battery of lens diminishes.

2) three groups of compositions

When this optical system is the varifocal optical system that three groups are constituted, it is preferably provided with least one set and comprises above-mentioned diffraction surfaces There is the battery of lens of positive refractive power, and make each battery of lens relative movement, thus from wide-angle side to telescope end zoom time can change The interval of each battery of lens.

Specifically, can be formed to possess to be followed successively by from object side and there is the first battery of lens of negative refractive power, just have Second battery of lens of refractive power, there are three groups of structures of the positive negative/plus or minus of the 3rd battery of lens of the refractive power of plus or minus/positive/negative Become.Now, from wide-angle side to telescope end zoom time, preferably fix the 3rd battery of lens, make the first battery of lens and/or the second battery of lens Mobile.Additionally, the refractive power of the 3rd battery of lens can be infinitely small.In the varifocal optical system of this composition, based on so-called environment Also be able to during variations in temperature suppress the most well the viewpoint of the variation of each aberration, the preferably second battery of lens be above-mentioned specify saturating Mirror group.

And it is possible to formed possess comprise diffraction surfaces first battery of lens with positive refractive power, there is negative refractive power Second battery of lens and have positive refractive power the 3rd battery of lens positive/negative/positive three group constitute.Now, from wide-angle side to looking in the distance During end zoom, preferably fixed first lens group, make the second battery of lens and/or the 3rd battery of lens move.The zoom light of this composition In system, during based on so-called variation of ambient temperature, it also is able to suppress the most well the change of each aberration at whole zooming range Moving, and then maintain the viewpoint of good imaging, the preferably first battery of lens and/or the second battery of lens are the above-mentioned lens specified Group.

3) four groups of compositions

When this optical system is the varifocal optical system that four groups are constituted, it is preferably provided with least one set and comprises above-mentioned diffraction surfaces There is the battery of lens of positive refractive power, and make each battery of lens relative movement, thus from wide-angle side to telescope end zoom time can change The interval of each battery of lens.

Specifically, can be formed possess be followed successively by from object side have positive refractive power the first battery of lens, have negative Second battery of lens of refractive power, have positive refractive power the 3rd battery of lens and have positive refractive power the 4th battery of lens just/ Four groups of compositions of positive negative/positive.Now, from wide-angle side to telescope end zoom time, preferably fixed first lens group so that it is his lens The most any one group of battery of lens in group moves.In the varifocal optical system of this composition, based on what is called from visible wavelength model The big wave-length coverage enclosed near infrared wavelength region corrects the viewpoint of each aberration etc. the most well, the preferably first battery of lens, Any one group of battery of lens in 3rd battery of lens and the 4th battery of lens is the above-mentioned battery of lens specified.

There is the first battery of lens of negative refractive power and it is possible to formed to possess to be followed successively by from object side, there is positive refractive power Second battery of lens of power, have positive refractive power the 3rd battery of lens and have positive refractive power the 4th battery of lens positive negative/just/ Four groups of positive compositions.Now, from wide-angle side to telescope end zoom time, preferably fix the 4th battery of lens so that it is in his battery of lens The most any one group of battery of lens moves.In the varifocal optical system of this composition, it also is able to more during based on so-called variation of ambient temperature For suppressing the variation of each aberration well, and then to maintain the viewpoint of good imaging performance, the preferably second battery of lens be above-mentioned finger Fixed battery of lens.

4) five groups of compositions

When this optical system is the varifocal optical system that five groups are constituted, it is preferably provided with least one set and comprises above-mentioned diffraction surfaces There is the battery of lens of positive refractive power, and make each battery of lens relative movement, thus from wide-angle side to telescope end zoom time can change The interval of each battery of lens.

Specifically, can be formed possess be followed successively by from object side have positive refractive power the first battery of lens, have negative Second battery of lens of refractive power, there is the 3rd battery of lens of positive refractive power, there is the 4th battery of lens of positive refractive power and have negative Positive/negative/just/positive/negative five groups of compositions of the 5th battery of lens of refractive power.Now, from wide-angle side to telescope end zoom time, preferably Fixed first lens group, and make the most any one group of battery of lens in other lenses group move.The varifocal optical system of this composition In, it also is able to suppress the most well the variation of each aberration during based on so-called variation of ambient temperature, and then maintains good imaging The viewpoint of performance, any one group of battery of lens in the preferably first battery of lens, the 3rd battery of lens and the 4th battery of lens is above-mentioned appointment Battery of lens.

There is the first battery of lens of positive refractive power and it is possible to formed to possess to be followed successively by from object side, there is negative refractive power Second battery of lens of power, there is the 3rd battery of lens of positive refractive power, there is the 4th battery of lens of positive refractive power and there is positive refractive power Positive/negative/just/just/positive five groups of compositions of the 5th battery of lens of power.Now, from wide-angle side to telescope end zoom time, preferably make to Few any one group of battery of lens moves.In the varifocal optical system of this composition, based on can be the best during so-called variation of ambient temperature Suppressing well the variation of each aberration, and then maintain the viewpoint of good imaging performance, the preferably the 4th battery of lens is above-mentioned appointment Battery of lens.

Additionally, in this optical system, all it is preferably provided with in the case of two kinds of single focus optical system and varifocal optical system Configuring and having the first battery of lens of positive refractive power near object side, and this first battery of lens is comprising at least one by two The cemented lens that lens are constituted.When this first battery of lens is the composition comprising at least one above-mentioned cemented lens, in this optical system Maximum focal length shown by system can carry out the correction of axial chromatic aberration well.Further, shown by this optical system Little focal length can carry out the correction of multiplying power chromatic aberration well.Now, constituting any one lens in the lens of cemented lens is When being made up of unusual low chromatic dispersion material, it is possible to carry out the correction of above-mentioned chromatic aberration the most well.

Further, the first battery of lens in addition to above-mentioned cemented lens, it is also preferred that comprise that two sides contacts with air layer single thoroughly Mirror.Now, the correction of curvature of the image can be carried out well at the minimum focus shown by this optical system.

1-3, vibration-resistant group

During additionally, the optical system of the present invention is any one in single focus optical system and varifocal optical system, all All or part of of any one group of battery of lens in the battery of lens that this optical system comprised can be made in the side vertical with optical axis Upwards move, thus the vibration-resistant group that the image fog etc. being used as causing the vibration etc. during shooting is corrected.

1-4, conditional

Secondly, in the optical system of the present invention, as it has been described above, the first lens meet following conditional (1), lens Meet following conditional (2).Further, this optical system preferably meets conditional described later (3)～conditional (19).Hereinafter, Successively each conditional is illustrated.

dndtP1×10⁶>-5…(1)

Ndi≥-0.014×νdi+2.5…(2)

Wherein, " dndt " be more than 20 DEG C the temperature range of less than 40 DEG C for 632.8nm wavelength light, vacuum The temperature coefficient (absolute dn/dT) of the absolute index of refraction of middle lens, " dndtP1 " is the dndt of the first lens, and " Ndi " is Lens are for the refractive index of d line, and " ν di " is the described lens Abbe numbers for d line, and " d line " is 587.56nm wavelength Light.

1-4-1, conditional (1)

Conditional (1) is the condition that the first lens need to meet.When meeting conditional (1), often single during variation of ambient temperature The variable quantity of the refractive index of these the first lens of megadyne temperature degree is little.As it has been described above, the first lens are to have the lens specified with this The lens that in the lens of the refractive power of group same-sign, refractive power is maximum.For meeting the lens of conditional (1), ambient temperature The change of refractive index during change is little.Therefore, by the first lens are set to meet the lens of conditional (1), in ambient temperature The change of the optical characteristics of the first lens can be suppressed during change.It is as a result, it is possible to suppress the optical characteristics of this optical system, especially It is the change of focal length, focal position, back focusing amount etc..And it is possible to suppress the variation of spherical aberration well.Thus, ring It also is able to maintain the imaging performance of this optical system during the variations in temperature of border.

When first lens are unsatisfactory for conditional (1), the variable quantity of the refractive index of the first lens during variation of ambient temperature with Change is compared big when meeting conditional (1).First lens are the lens that refractive power is maximum in this battery of lens specified, thus environment When the change of temperature causes the variations in refractive index of these the first lens, the focal length etc. of this battery of lens specified changes, its result, The probability that the focal length of this optical system, focal position, back focusing amount etc. change becomes big.Further, the variation of spherical aberration Also become big.Therefore, according to the difference of ambient temperature, it may appear that image planes cannot accurately imaging subject image, imaging Situation about be remarkably decreased, thus the most preferred.

For the viewpoint of these effects of acquisition, the first lens more preferably meet following conditional (1-a).

dndtP1×10⁶>-4.5…(1-a)

1-4-2, conditional (2)

Conditional (2) is the formula of the optical characteristics about the material (glass material) constituting lens.Comprise by showing Abbe number at glass material is transverse axis, in the glass material performance plot that refractive index is the longitudinal axis of this glass material of d line The glass material of the refractive index on straight line that "-0.014 × ν di+2.5 " represents or the refractive index bigger than this straight line constitute the During lens, it is possible to carry out the correction of chromatic aberration etc. the most well, and obtain the optical system with high imaging performance.This In, the glass material meeting conditional (2) belongs to the low chromatic dispersion material of so-called abnormality more, and during variation of ambient temperature, optical characteristics is sent out The probability of changing is big.But as it has been described above, the refractive power of lens is less than the refractive power of the first lens.Therefore, ambient temperature Even if the optical characteristics of these lens changes during change, it is also possible to suppress the change of the optical characteristics of this optical system, and Maintain high imaging performance.

During in contrast, do not comprise the lens meeting conditional (2), it may appear that the correction of chromatic aberration etc. is insufficient Problem, and then be difficult to obtain the optical system that imaging performance is high.

1-4-3, conditional (3)

In this optical system, the first lens preferably meet following conditional (3).

Nd1<-0.02×νd1+2.95…(3)

Wherein, " Nd1 " is described first lens refractive indexs for d line, and " ν d1 " is that described first lens are for d line Abbe number.

Identical with conditional (2), conditional (3) is also the formula of the glass material about the first lens.First lens are full During foot conditional (3), during variation of ambient temperature, the optical characteristics of the first lens is more difficult to change, it is possible to tie up the most well Hold the imaging performance of this optical system.

When first lens are unsatisfactory for conditional (3), owing to the refractive power of the first lens is big, based on in conditional (1) The reason that alleged cause is identical, according to the difference of ambient temperature, it may appear that cannot accurately imaging subject figure in image planes Picture, the problem that imaging performance reduces, thus the most preferred.

For the viewpoint of these effects of acquisition, the first lens more preferably meet following conditional (3-a).

Nd1<-0.014×νd1+2.5…(3-a)

1-4-4, conditional (4)

In this optical system, the first lens preferably meet following conditional (4).

αP1×10⁷<120…(4)

Wherein, " α P1 " is that described first lens are comprising the temperature range specified of more than 0 DEG C 40 DEG C of temperature below scopes In the value of average coefficient of linear expansion α.Here, as the temperature range specified, such as, for the temperature of more than-30 DEG C less than 70 DEG C Degree scope, is preferably the average coefficient of expansion in this temperature range.Average in the temperature range of more than-30 DEG C less than 70 DEG C When the value of linear expansion coefficient α (-30/70) is indefinite, can use that comprise the temperature range of more than 0 DEG C less than 40 DEG C ,-50 DEG C Average coefficient of expansion α in the arbitrary temperature range of above less than 90 DEG C.

Conditional (4) is also the formula of the glass material about the first lens.When first lens meet conditional (4) ,-30 More than DEG C, the linear expansion coefficient in the temperature range of less than 70 DEG C is little, also is able to when variation of ambient temperature suppress the first lens The change of thickness etc..Therefore, also be able to during variation of ambient temperature to suppress the variation of the refractive power of the first lens, the first lens and its The variation of the lens separation of his lens, and focal position or the deviation of back focusing amount caused by these variations can be suppressed.Its As a result, it also is able to maintain the most well the imaging performance of this optical system during variation of ambient temperature.

For the viewpoint of these effects of acquisition, the first lens more preferably meet following conditional (4-a), further preferably Meet conditional (4-b).

αP1×10⁷<100…(4-a)

αP1×10⁷<90…(4-b)

1-4-5, conditional (5)

In this optical system, the above-mentioned battery of lens specified preferably meets following conditional (5).

-65<dndtP1×Fg×Pw1×10⁷<65…(5)

Wherein, " Fg " is the focal length of the above-mentioned battery of lens specified, and " Pw1 " is the refractive power of the first lens.

Conditional (5) is the variable quantity of the refractive index of the per unit temperature about the first lens, the above-mentioned battery of lens specified Focal length and the formula of refractive power of the first lens.When meeting conditional (5), relative to the focal length of this battery of lens specified, the The variations in refractive index of per unit temperature of one lens and the value of refractive power are in suitable scope, it is possible to suppress ring the most well The focal position of this optical system that border variations in temperature causes or the deviation of back focusing amount, it is also possible to suppress sphere the most well The variation of aberration.Its result, also is able to maintain the most well the imaging performance of this optical system during variation of ambient temperature.

For the viewpoint of these effects of acquisition, the above-mentioned battery of lens specified more preferably meets following conditional (5-a).

-60<dndtP1×Fg×Pw1×10⁷<60…(5-a)

Further, when this optical system is the varifocal optical system that two groups are constituted, based on obtaining the viewpoint of the effect above, above-mentioned The battery of lens specified more preferably meets following conditional (5-b).

-25<dndtP1×Fg×Pw1×10⁷<25…(5-b)

1-4-6, conditional (6)

In this optical system, the above-mentioned battery of lens specified, in addition to the first lens and lens, preferably has at least one Individual lens, and meet following conditional (6).

0<Σdoe{νdx/fx}×ft≤150…(6)

Wherein, " Σ doe{ ν dx/fx} " is { sum of ν d/fi} the value, " ν of each lens constituting the above-mentioned battery of lens specified Dx " it is each lens constituting the above-mentioned battery of lens the specified Abbe numbers for d line, " fx " is to constitute the above-mentioned battery of lens specified The focal length of each lens, " ft " is the maximum focal length that this optical system can show.

The above-mentioned battery of lens specified, in addition to the first lens and lens, has at least one lens, constitutes above-mentioned finger When each lens of fixed battery of lens meet conditional (6) for the Abbe number of d line and focal length etc., each picture during variation of ambient temperature The variation of difference has the tendency becoming less, and can maintain imaging performance the most well.

For the viewpoint of these effects of acquisition, this optical system more preferably meets following conditional (6-a) (wherein, two Except the situation of the varifocal optical system that group is constituted).

20<Σdoe{νdx/fx}×ft≤130…(6-a)

When this optical system is the varifocal optical system that two groups are constituted, for the viewpoint of acquisition the effect above, this optical system System preferably meets following conditional (6-b), more preferably meets following conditional (6-c).

0<Σdoe{νdx/fx}×ft≤130…(6-b)

0<Σdoe{νdx/fx}×ft≤35…(6-c)

1-4-7, conditional (7)

By above-mentioned phase function formulaWhen () represents above-mentioned diffraction surfaces h, this optical system preferably meets following bar Part formula (7).

-25<C01×Fg×1000<5…(7)

Wherein, " C01 " is diffraction surfaces coefficient as above, and " h " is the length in same radial from optical axis, and " Fg " is The focal length of the above-mentioned battery of lens specified.

Conditional (7) is the formula of the focal length of the shape about diffraction surfaces and this battery of lens specified.Meet conditional (7) Time, it is possible to carry out the correction of chromatic aberration etc. the most well, and the higher optical system of imaging performance can be obtained.Additionally, by The focal length (fD) of the paraxial diffraction light that diffraction surfaces produces can use fD=-1/ (2 × C01) to represent.

1-4-8, conditional (8)

Further, by above-mentioned phase function formulaWhen () represents above-mentioned diffraction surfaces h, this optical system preferably meet below Conditional (8).

-1.5<C01×tan(ωw)×fw×1000<0…(8)

Wherein, " C01 " is diffraction surfaces coefficient as above, and " ω w " is the minimum focus that this optical system can show On angle of half field-of view, " fw " is the minimum focus that this optical system can show.Additionally, the minimum that this optical system can show Focal length refers to, this optical system is to be the focal length of this optical system during single focus optical system, and this optical system is Zoom optical It it is the focal length of this optical system of wide-angle side during system.

Conditional (8) is the shape about diffraction surfaces, this optical system can show minimum focus and visual angle at that time Formula.When meeting conditional (8), it is possible to carry out the chromatic aberration of the minimum focus that this optical system can show the most well Correction.

1-4-9, conditional (9)

This optical system preferably meets following conditional (9).

-0.05≤Δ(d-s)/f≤0.05…(9)

Wherein, " f " is the arbitrary focal length that this optical system entirety can show, " Δ (d-s) " is that this optical system is whole The paraxial imagery position of the s line for d line on any focal length that body can show, " s line " is the light of 852.11nm wavelength.

Here, when this optical system is varifocal optical system, more preferably meet following conditional (9-a) and/or condition Formula (9-b).

-0.05≤WΔ(d-s)/fW≤0.05…(9-a)

-0.01≤TΔ(d-s)/fT≤0.01…(9-b)

Wherein, " fW " is the focal length of this optical system entirety of wide-angle side, and " fT " is that this optical system of telescope end is overall Focal length, " W Δ (d-s) " is the paraxial imagery position of the s line relative to d line of wide-angle side, and " T Δ (d-s) " is telescope end Relative to the paraxial imagery position of the s line of d line, " d line " is as it has been described above, " s line " is the light of 852.11nm wavelength.

When meeting conditional (9), the paraxial imagery position as the d line of the light of visible wavelength range is the reddest with conduct The difference (focus offset) of the paraxial imagery position of the s line of the light of outer wave-length coverage is small, thus the light that this optical system uses When the wavelength of line changes between visible wavelength range and near infrared wavelength region, focal position also will not change, it is possible to Suppress the variation of each aberration.Therefore, when forming the optical system meeting conditional (9), when variation of ambient temperature, should The wavelength of the light that optical system uses also is able to suppression when changing between visible wavelength range and near infrared wavelength region Focal position or the deviation etc. of back focusing amount, and maintain high imaging performance.

When this optical system is varifocal optical system, by meeting conditional (9-further on the basis of conditional (9) A) and/or conditional (9-b), at the arbitrary focal length that varifocal optical system shows, the wavelength of the light used is at visible ray It also is able to prevent the change of focal position during change between wave-length coverage and near infrared wavelength region, and suppresses the change of each aberration Dynamic.That is, at the whole zooming range of this varifocal optical system, when variation of ambient temperature, this optical system uses The wavelength of light also be able to when changing between visible wavelength range and near infrared wavelength region suppress focal position or after adjust The deviation etc. of burnt amount, and maintain high imaging performance.

For the viewpoint of these effects of acquisition, when this optical system is varifocal optical system, more preferably meet following bar Part formula (9-a) ' and conditional (9-b) '.

-0.02≤WΔ(d-s)/fW≤0.02…(9-a)’

-0.005≤TΔ(d-s)/fT≤0.005…(9-b)’

Additionally, for conditional (9), during the focal length that " f " is wide-angle side in conditional (9-a), then become and this The formula that part formula (9) is identical.Further, bigger than wide-angle side at telescope end subject image, thus compared with wide-angle side, above-mentioned closely The impact that imaging performance is caused by the difference of imaging shaft position is big.Therefore, at telescope end by meeting conditional (9-b), used Light wave-length coverage change time also be able to prevent the profile of subject image from becoming the distinctest, at whole zooming range energy Enough there is good imaging performance.

1-4-10, conditional (10)

In this optical system, the lens with diffraction surfaces preferably meet following conditional.

-3.0≤Σ{θCs/(fd×νd)}/Σ{1/(fd×νd)}≤3.0…(10)

Wherein, θ Cs=(nC-ns)/(nF-nC), " nC " is to have the saturating of diffraction surfaces for the above-mentioned of C line (656.27nm) The refractive index of mirror, " ns " is the refractive index of the above-mentioned lens with diffraction surfaces for s line, and " nF " is for F line (486.13nm) refractive index of the above-mentioned lens with diffraction surfaces, " fd " is the above-mentioned lens with diffraction surfaces for d line Focal length, " ν d " is the Abbe number of the above-mentioned lens with diffraction surfaces for d line.

Here, " having the lens of diffraction surfaces " refers to above-mentioned diffraction optical element, and this diffraction optical element can be monolayer Any one situation in diffraction optical element and multilayer diffraction optical element.Further, " there is the refraction of the lens of diffraction surfaces Rate " refer to the refractive index of this diffraction optical element, for multilayer diffraction optical element, refer to than diffraction surfaces closer to picture The refractive index of the layer (lens) of side, face configuration.

Conditional (10) is the rate of change about diffraction optical element refractive power in visible wavelength range and at C The formula of the rate of change of the refractive power of line～s line.When meeting conditional (10), in this diffraction optics of wave-length coverage of C line～s line The anomalous dispersion of element is low, in described wave-length coverage, in addition to first-order spectrum, also is able to second order spectrum carry out well Chromatic aberration correction.Accordingly, it is capable to access the optical system in big wave-length coverage with high imaging performance.

During in contrast, be unsatisfactory for conditional (10), this diffraction optical element also exists in the wave-length coverage of C line～s line The scope of display anomalous dispersion, thus in C line～the wave-length coverage of s line, the correction of second order spectrum becomes difficulty, it may appear that Described wave-length coverage is difficult to obtain the situation of good imaging performance.

For the viewpoint of acquisition the effect above, more preferably meet following conditional (10-a).

-1.0≤Σ{θCs/(fd×νd)}/Σ{1/(fd×νd)}≤2.0…(10-a)

During additionally, this optical system comprises multiple diffraction surfaces, preferably at least any one diffraction surfaces meets this conditional (10), the most all diffraction surfaces meet this conditional (10).For conditional (10-a), it also it is identical situation.And And, for the diffraction surfaces in the battery of lens configuration not comprising the first lens and lens but comprise diffraction surfaces, also it is identical Situation.

1-4-1, conditional (11)

In this optical system, the lens with diffraction surfaces preferably meet following conditional.Wherein, this has diffraction surfaces Lens are identical with time conditional (11).

-15≤Σ{1/(fd×νd)}/Σ{θgF/(fd×νd)}≤15…(11)

Wherein, θ gF=(ng-nF)/(nF-nC), " ng " is to have the saturating of diffraction surfaces for the above-mentioned of g line (435.84nm) The refractive index of mirror, " nF " is as it has been described above, " nC " is the refraction of the above-mentioned lens with diffraction surfaces for C line (656.27nm) Rate, " ns ", " fd " and " ν d " are each as described above.

Conditional (11) be about diffraction optical element refractive power rate of change in visible wavelength range with at F line～ The formula of the difference of the refractive power rate of change of g line.When meeting conditional (3), in this diffraction optics unit of wave-length coverage of F line～g line The anomalous dispersion of part is low, in described wave-length coverage, in addition to first-order spectrum, second order spectrum also is able to carry out well color Aberration correction.Accordingly, it is capable to access the optical system in big wave-length coverage with high imaging performance.

During in contrast, be unsatisfactory for conditional (11), this diffraction optical element exists from the wave-length coverage of F line～g line The scope of display anomalous dispersion, thus in F line～the wave-length coverage of g line, the correction of second order spectrum become difficulty, it may appear that It is difficult to obtain the situation of good imaging performance in described wave-length coverage.

For the viewpoint of acquisition the effect above, this optical system more preferably meets following conditional (11-a).

-13≤Σ{1/(fd×νd)}/Σ{θgF/(fd×νd)}≤7.0…(11-a)

During additionally, this optical system comprises multiple diffraction surfaces, preferably at least any one diffraction surfaces meets this conditional (11), the most all diffraction surfaces meet this conditional (11).For conditional (11-a), it also it is identical situation.

1-4-12, conditional (12)

In this optical system, the above-mentioned battery of lens specified preferably meets following conditional (12).

0<νd1/Pw1/fw<1300…(12)

Wherein, " ν d1 " is described first lens Abbe numbers for d line, and " Pw1 " is the refractive power of described first lens, " fw " is the minimum focus that this optical system can show.

When meeting conditional (12), it also is able to during variation of ambient temperature suppress focal position or the deviation etc. of back focusing amount. Further, when meeting this conditional (12), it is possible to carry out the chromatic aberration correction of this optical system the most well.Therefore, it is possible to To the higher optical system of imaging performance, and during variation of ambient temperature, it also is able to maintain high imaging performance.

1-4-13, conditional (13)

In this optical system, preferably meet following conditional (13).

-100<dndtP1×Pw1×fw×10⁷<40…(13)

Wherein, " Pw1 " and " fw " is described above.

Conditional (13) is the variable quantity of refractive index of the per unit temperature about the first lens, the refractive power of the first lens Formula with the minimum focus that this optical system can show.When meeting conditional (13), can show relative to this optical system The minimum focus shown, the variations in refractive index of per unit temperature of the first lens and the value of refractive power are in suitable scope, at this Minimum focus, also is able to maintain the most well the imaging performance of this optical system during variation of ambient temperature.

For the viewpoint of acquisition the effect above, this optical system more preferably meets following conditional (13-a).

-100<dndtP1×Pw1×fw×10⁷<40…(13-a)

When this optical system is the varifocal optical system that two groups are constituted, for the viewpoint of acquisition the effect above, this optical system System more preferably meets following conditional (13-b).

-6<dndtP1×Pw1×fw×10⁷<6…(13-b)

When this optical system is the varifocal optical system that three groups are constituted, for the viewpoint of acquisition the effect above, this optical system System more preferably meets following conditional (13-c).

-50<dndtP1×Pw1×fw×10⁷<50…(13-c)

When this optical system is the varifocal optical system that four groups are constituted, for the viewpoint of acquisition the effect above, this optical system System more preferably meets following conditional (13-d).

-12<dndtP1×Pw1×fw×10⁷<12…(13-d)

1-4-14, conditional (14)

In this optical system, preferably meet following conditional (14).

-130<dndtP1×Pw1×ft×10⁷<260…(14)

Wherein, " Pw1 " and " ft " is described above.

Conditional (14) is the variable quantity of refractive index of the per unit temperature about the first lens, the refractive power of the first lens Formula with the maximum focal length that this optical system can show.When meeting conditional (14), can show relative to this optical system The maximum focal length shown, the variations in refractive index of per unit temperature of the first lens and the value of refractive power are in suitable scope, at this Maximum focal length, also is able to maintain the most well the imaging performance of this optical system during variation of ambient temperature.

For the viewpoint of acquisition the effect above, this optical system more preferably meets following conditional (14-a).

-130<dndtP1×Pw1×ft×10⁷<60…(14-a)

When this optical system is the varifocal optical system that two groups are constituted, for the viewpoint of acquisition the effect above, this optical system System more preferably meets following conditional (14-b).

-12<dndtP1×Pw1×ft×10⁷<13…(14-b)

When this optical system is the varifocal optical system that three groups are constituted, for the viewpoint of acquisition the effect above, this optical system System more preferably meets following conditional (14-c).

-120<dndtP1×Pw1×ft×10⁷<120…(14-c)

When this optical system is the varifocal optical system that four groups are constituted, for the viewpoint of acquisition the effect above, this optical system System more preferably meets following conditional (14-d).

-80<dndtP1×Pw1×ft×10⁷<80…(14-d)

1-4-15, conditional (15)

In this optical system, in the above-mentioned battery of lens specified, have shown by the battery of lens entirety specified with this In the lens of the refractive power of refractive power same-sign, when the lens second largest for refractive power are set to the second lens, the first lens and Described second lens preferably meet following conditional (15).

-130<dndtP1×Pw1×fw+dndtP2×Pw2×fw×10⁷<0…(15)

Wherein, " dndtP2 " is above-mentioned " dndt " of the second lens, and " Pw2 " is the refractive power of the second lens, " dndtP1 ", " Pw1 " and " fw " is described above.

In the above-mentioned battery of lens specified, there is the refractive power same-sign shown by the battery of lens entirety specified with this In the lens of refractive power, the first lens that refractive power is maximum and second largest the second lens of refractive power meet above-mentioned conditional (15) Relation time, the variable quantity of the refractive index of the per unit temperature of the second lens and refractive power be in suitable scope, environment temperature It also is able to maintain the most well imaging performance during degree change.

For the viewpoint of acquisition the effect above, this optical system more preferably meets following conditional (15-a).

-120<dndtP1×Pw1×fw+dndtP2×Pw2×fw<0…(15-a)

1-4-16, conditional (16)

In this optical system, the first lens and above-mentioned second lens preferably meet following conditional (16).

When meeting conditional (16), when this optical system is varifocal optical system, it also is able to during variation of ambient temperature Whole zooming range maintains imaging performance well.

For the viewpoint of acquisition the effect above, the first lens and above-mentioned second lens more preferably meet following conditional (16-a)。

When this optical system is the varifocal optical system that two groups are constituted, for the viewpoint of acquisition the effect above, the first lens And above-mentioned second lens more preferably meet following conditional (16-b).

When this optical system is the varifocal optical system that three groups are constituted, for the viewpoint of acquisition the effect above, the first lens And above-mentioned second lens more preferably meet following conditional (16-c).

When this optical system is the varifocal optical system that four groups are constituted, for the viewpoint of acquisition the effect above, the first lens And above-mentioned second lens more preferably meet following conditional (16-d).

1-4-17, conditional (17)

In this optical system, above-mentioned second lens preferably meet following conditional (17).

Nd2≥-0.014×νd2+2.5…(17)

Wherein, " Nd2 " is second lens refractive indexs for d line, and " ν d2 " is second lens Abbe numbers for d line.

When second lens meet conditional (17), above-mentioned lens can be set to the second lens.Its result, as above institute State, while carrying out the correction of chromatic aberration etc. the most well and obtaining the higher optical system of imaging performance, it is possible to suppression Constitute the increase of the number of lenses of this battery of lens, and this optical system can be constituted compactly.

1-4-18, conditional (18)

In this optical system, it is preferably provided with at the first battery of lens configuring and having positive refractive power near object side, should First battery of lens comprises at least one cemented lens being made up of two lens, in this first battery of lens, near object The cemented lens of side configuration meets following conditional (18).

30<|νa1-νa2|<50…(18)

Wherein, " ν a1 " is the object side lens the constituting described cemented lens Abbe numbers for d line, and " ν a2 " is to constitute institute State the image planes side lens Abbe number for d line of cemented lens.

When this optical system meets conditional (18), in addition to the chromatic aberration correction utilizing diffraction optical element, pass through The Abbe number difference of cemented lens can correcting chromatic aberration the most well, and the optical system that imaging performance is high can be obtained.

When the numerical value of conditional (18) is below lower limit, the Abbe number of positive/negative two lens constituting cemented lens is poor Little, when especially this optical system is zoom rate high varifocal optical system, also exists and cannot be adequately formed side of looking in the distance The axially situation of chromatic aberration, thus the most preferred.On the other hand, when the numerical value of above-mentioned formula (18) is more than higher limit, constitutes and engage The Abbe number difference of the above-mentioned two lens of lens becomes excessive.Now, the above-mentioned lens constituting cemented lens become unusual color Dissipate material, it may appear that the situation of axial chromatic aberration cannot be adequately formed, thus the most preferred.

Chromatic aberration also exists and relies on the linear linear composition of wavelength change and non-linear composition (anomalous dispersion).First Lens be constitute cemented lens lens time, compared with first lens situation presented in simple lens, be more beneficial for into The correction of the chromatic aberration of row non-linear composition.When second lens are the lens constituting cemented lens, utilize in cemented lens with the The other lenses of two lens combinations can correct the chromatic aberration of non-linear composition further.And then, cemented lens comprises diffraction During face, it is possible to guarantee the chromatic aberration of linear composition the most well.

1-4-19, conditional (19)

When this optical system has above-mentioned first battery of lens, this first battery of lens preferably in addition to above-mentioned cemented lens, Also comprise the simple lens that two sides contacts with air layer, and meet following conditional (19).

0.21<|NPa1-NP1|<6…(19)

Wherein, " NPa1 " is formed in the cemented lens configured near object side and just has in being described first battery of lens The lens of refractive power are for the refractive index of d line, and " NP1 " is to configure near object side and just having in described first battery of lens The described simple lens of refractive power is for the refractive index of d line.

When meeting this conditional (19), beam diameter can be converged at the first battery of lens, and can structure compactly Become this optical system.Further, when this optical system is varifocal optical system, by meeting this conditional (19), especially can Correct the curvature of the image of Radix Rumicis side well.

Further, when this optical system is to possess the battery of lens of more than four groups and have the varifocal optical system of high zoom rate, First battery of lens from object side successively by engaging the lens with negative refractive power and there is the joint of lens of positive refractive power Lens and two sides contact with air layer and have the simple lens of positive refractive power and constitute, and the simple lens with positive refractive power meets During above-mentioned conditional (19), it is possible to correct the axial chromatic aberration of side of looking in the distance the most well.

2, camera head

Secondly, the camera head of the present invention is illustrated.The camera head of the present invention is characterised by, possesses above-mentioned The optical system of invention and imaging apparatus, described imaging apparatus is arranged on the image planes side of this optical system, will be by this optical system The optical imagery formed is converted to the signal of telecommunication.Here, for imaging apparatus etc., there is no particular limitation, it is possible to use CCD senses The solid-state imager such as device or cmos sensor etc..The camera head of the present invention is suitable for use as digital camera or digital code camera Etc. the camera head that have employed solid-state imager.Further, this camera head both can be the fixing lens in the housing of lens Fixed camera head, it is also possible to be the shooting dress of the camera lens switch type such as slr camera or reflector-free interchangeable lenses camera Put.

Secondly, it is shown that the present invention is done specific description by embodiment and comparative example.But the present invention is not by following example Restriction.The optical system of each embodiment being exemplified below is to image at digital camera, digital code camera, silver film camera etc. The image pickup optical system used in device (Optical devices).Further, in each lens profile figure, the left side of drawing is object side, right Side is image planes sides.

Embodiment 1

1) composition of optical system

Fig. 1 is the saturating of the lens composition during infinity focusing of the optical system wide-angle side representing embodiments of the invention 1 Mirror profile, Fig. 2 is the lens profile figure that the lens during infinity focusing representing telescope end are constituted.This optical system is focal length Variable varifocal optical system, successively by having the first battery of lens 1G of negative refractive power and having positive refractive power from object side Second battery of lens 2G constitute.

First battery of lens 1G from object side successively by convex surface facing object side, there is the meniscus lens of negative refractive power, tool Have negative refractive power biconcave lens and convex surface facing object side have positive refractive power meniscus lens constitute.Second battery of lens 2G from object side successively by convex surface facing object side the meniscus lens with positive refractive power, there is the lenticular of positive refractive power Mirror, convex surface facing object side the meniscus lens with negative refractive power, engage and there is the biconvex lens of positive refractive power and have The cemented lens bearing the biconcave lens of refractive power and the biconvex lens with positive refractive power are constituted.Here, the second battery of lens 2G is The above-mentioned battery of lens specified mentioned in the present invention, constitute the above-mentioned cemented lens that comprises in the second battery of lens 2G, above-mentioned recessed The face of the object side contacted with air layer of lens is diffraction surfaces DOE.The biconvex lens constituting this cemented lens is in the present invention The first lens mentioned.Further, the biconvex lens of second position configuration from object side at the second battery of lens 2G is this The second lens mentioned in invention.These are respectively provided with and the refractive power of the second battery of lens entirety same-sign.Further, saturating first It is configured with aperture diaphragm between mirror group 1G and the second battery of lens 2G.

In the optical system of this embodiment 1, from wide-angle side to telescope end zoom time, the first battery of lens 1G is to image planes sidesway Dynamic, the second battery of lens 2G moves to object side.

Additionally, " CG " shown in the image planes side of the second battery of lens 2G is protection glass or cover glass, represent that low pass filters Sheet or infrared intercepting filter etc..Further, " IMG " is image planes, and the concrete expression solid such as ccd sensor or cmos sensor is taken the photograph The imaging surface of element or the glue surface etc. of silver film.These symbols etc. cut open at each lens shown in embodiment 2～embodiment 16 It face figure is also same situation.

2) numerical example

Secondly, the numerical example that this optical system introduces concrete numerical value illustrates.Table 1 shows this light The lens data of system.In table 1, " face No. " represents that the order (face numbering) of lens face from object side number, " r " represent The radius of curvature of lens face, " d " represents the interval on the optical axis of lens face, and " Nd " represents for d line (wavelength X=587.6nm) Refractive index, " vd " represents for the Abbe number of d line.Further, when lens face is aspheric surface, after the numbering of face, " * (asterisk) " is marked. Further, when lens face is diffraction surfaces, after the numbering of face, " # (well character) " is marked.When lens face is aspheric surface and/or diffraction surfaces, bent Rate radius " r " one hurdle is illustrated that radius of curvature.

Further, for the aspheric surface shown in table 1, table 2 (2-1) shows and defines aspheric surface during its shape by following formula Coefficient.In table 2 (2-1), " E-a " expression " × 10^-a”。

$X\left(h\right)=\frac{h^2/r}{1+\sqrt{1-\left(1+k\right)h^2/r^2}}+A4\&CenterDot;h^4+A6\&CenterDot;h^6+A8\&CenterDot;h^8+A10\&CenterDot;h^{10}$

In above-mentioned formula, " R " represents curvature, and " h " represents the height from optical axis, and " k " represents circular cone coefficient, " A4 ", " A6 ", " A8 ", " A10 " ... represent the asphericity coefficient of each power.

And then, table 2 (2-2) shows the focal length (F) of this optical system entirety, F value (Fno), angle of half field-of view (ω), table Variable interval shown in 1.In table 2 (2-2), " 6 ", " 7 ", " 19 " refer respectively to the variable interval " d6 " shown in table 1, " d7 ", " d19 ", eliminates the mark of " d " in table 2 (2-2).Table (2-3) has been used Jiao of each battery of lens that this optical system has Away from, wherein, f1 represents the focal length of the first battery of lens 1G, and f2 represents the focal length of the second battery of lens 2G.

For diffraction surfaces, table 3 showing, (face No), diffraction progression (m), standardized wavelength (λ), diffraction surfaces are numbered in its face Coefficient (C01, C02, C03, C04).Wherein, C01, C02, C03, C04 respectively with C1, C2, C3, C4 couple of above-mentioned phase function Should.Further, table 19 shows conditional (1)～the numerical value of conditional (19).Additionally, the long measure in each table is " mm ", is " ° " depending on angular unit.The item that these tables are relevant is also same in each table shown in embodiment 2～embodiment 9 Situation, thus in explanation omitted below.

Further, Fig. 3 shows the longitudinal aberration figure during infinity focusing of this optical system wide-angle side, Fig. 4 shows Longitudinal aberration figure time focusing in the infinity of this optical system telescope end.As each longitudinal aberration figure, represent successively from the left of drawing Be spherical aberration, astigmatism, distortion aberration.Represent that in the figure of spherical aberration, the longitudinal axis is and the ratio of open F value, and transverse axis is scattered Jiao, solid line is the spherical aberration of d line (wavelength X=587.5618nm), and dotted line is the sphere of s line (wavelength X=852.1100nm) Aberration, chain-dotted line is the spherical aberration of g line (wavelength X=435.8343nm).Represent that in the figure of astigmatism, the longitudinal axis is image height, transverse axis For defocusing, solid line is the astigmatism of sagittal surface, and dotted line is the astigmatism of meridian plane.Represent that in the figure distorting aberration, the longitudinal axis is image height, horizontal Axle is %, thus represents distortion aberration.The item that these longitudinal aberration figures are correlated with is at each vertical picture shown in embodiment 2～embodiment 9 Difference figure is also same situation, thus in explanation omitted below.

Table 1

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	41.300	0.900	1.9108	35.25	0.716	0.673	TAFD35	1.911	2.0065
2	9.610	4.992
										3	-34.750	0.700	1.7725	49.60	0.773	0.641	S-LAH66	1.773	1.8056
4	12.900	1.344
										5	16.910	3.000	1.9459	17.98	0.646	0.749	FDS18	1.946	2.2483
6	92.810	d6
										7	INF	d7
8*	16.456	1.500	1.5920	67.02	0.807	0.624	M-PCD51	1.592	1.5617
										9*	35.020	0.100
10	13.210	5.050	1.4970	81.54	0.796	0.626	S-FPL51	1.497	1.3584
										11	-13.972	0.100
12#	65.844	0.700	1.5814	40.89	0.737	0.667	E-FL5	1.581	1.9275
										13	7.118	4.450	1.5168	64.20	0.821	0.623	BSC7	1.517	1.6012
14	-14.676	0.600	1.6034	38.03	0.728	0.674	S-TIM5	1.603	1.9676
										15	8.572	0.444
16	12.916	2.400	1.7725	49.60	0.773	0.641	S-LAH66	1.773	1.8056
										17	-35.345	3.000
18	INF	1.500	1.5168	64.20	0.821	0.623	S-BSL7	1.517
										19	INF	d19

※ formula (2)=-0.014*v di+2.5

Table 2

(2-1)

Face NO.	k	A4	A6	A8	A10
						8	1.06	-6.3963E-05	-1.8163E-06	-1.8715E-07	2.3779E-09
9	0.50	1.9628E-04	-1.3522E-06	-1.7275E-07	2.6750E-09

2-2)

F	2.884	4.783	7.265
				Fno	1.260	9.000	9.000
ω	79.932	42.042	27.017
				6	23.121	10.696	6.958
7	7.200	4.634	0.595
				19	3.872	6.395	9.768

(2-3)

f1	-8.975
		f2	12.133

Table 3

Face No	12
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-3.015E-04
C02	-1.000E-06
		C03	6.338E-08
C04	0.000E+00

Embodiment 2

1) composition of optical system

Fig. 5 is the saturating of the lens composition during infinity focusing of the optical system wide-angle side representing embodiments of the invention 2 Mirror profile, Fig. 6 is the lens profile figure that the lens during infinity focusing representing telescope end are constituted.This optical system is focal length Variable varifocal optical system, successively by having the first battery of lens 1G of positive refractive power, having negative refractive power from object side Second battery of lens 2G and the 3rd battery of lens 3G with positive refractive power is constituted.

First battery of lens 1G is by engaging the bent moon with negative refractive power convex surface facing object side from object side successively Lens and have positive refractive power biconvex lens cemented lens constitute.Second battery of lens 2G from object side successively by convex surface Towards the meniscus lens with negative refractive power of object side with engage and there is the biconcave lens of negative refractive power and convex surface facing thing The cemented lens of the meniscus lens with positive refractive power on side is constituted.3rd battery of lens 3G from object side successively by just having The biconvex lens of refractive power, the joint engaging the biconvex lens with positive refractive power and the biconcave lens with negative refractive power are saturating Mirror and have positive refractive power biconvex lens constitute.Here, the 3rd battery of lens 3G be mention in the present invention above-mentioned specify saturating Mirror group, additionally, the 3rd battery of lens 3G is the first lens mentioned in the present invention at the biconvex lens configured near object side, The biconvex lens of the configuration of second position from object side of the 3rd battery of lens 3G, i.e., the plus lens that constitutes cemented lens be The second lens mentioned in the present invention.

In the optical system of this embodiment 2, from wide-angle side to telescope end zoom time, the first battery of lens 1G fixes, and second is saturating Mirror group 2G moves to object side to image planes side shifting, the 3rd battery of lens.

2) numerical example

Secondly, the numerical example that this optical system introduces concrete numerical value illustrates.Table 4 shows this optics The lens data of system, table 5 (5-1) shows that the aspheric asphericity coefficient shown in table 4, table 5 (5-2) show this optics Respectively may be used on the wide-angle side of system, middle focal length, telescope end respective focal length (F), F value (Fno), angle of half field-of view (ω), optical axis Changing distance.Table 5 (5-3) shows the focal length of each battery of lens that this optical system had, and f1 is the focal length of the first battery of lens 1G, F2 is the focal length of the second battery of lens 2G, and f3 is the focal length of the 3rd battery of lens 3G.About the diffraction surfaces comprised in the 3rd battery of lens 3G, Table 6 shows its face numbering (face No), diffraction progression (m), standardized wavelength (λ), diffraction surfaces coefficient (C01, C02, C03, C04).Further, table 19 shows conditional (1)～the numerical value of conditional (19).

Further, Fig. 7 shows the longitudinal aberration figure during infinity focusing of this optical system wide-angle side, Fig. 8 shows Longitudinal aberration figure time focusing in the infinity of this optical system telescope end.

Table 4

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	21.867	0.982	1.8467	23.78	0.672	0.711	FDS90	1.847	2.1671
2	16.222	2.742	1.5935	67.00	0.809	0.625	PCD51	1.593	1.5620
										3	-240.757	d3
4	68.680	0.700	1.4875	70.44	0.836	0.619	FC5	1.487	1.5138
										5	14.147	1.811
6	-14.388	0.700	1.7433	49.22	0.770	0.638	NBF1	1.743	1.8109
										7	15.847	1.715	1.9459	17.98	0.646	0.749	FDS18	1.946	2.2483
8	47.188	d8
										9*	7.966	4.700	1.6188	63.85	0.788	0.630	M-PCD4	1.619	1.6061
10*	-15.177	0.150
										11	6.873	2.500	1.4970	81.61	0.798	0.627	FCD1	1.497	1.3575
12#	-14.878	0.600	1.7408	27.76	0.690	0.700	E-FD13	1.741	2.1114
										13	4.111	2.112
14*	38.286	2.427	2.0018	19.32	0.650	0.739	M-FDS2	2.002	2.2295
										15*	-28.394	d15
16	INF	1.200	1.5168	64.20	0.821	0.623	S-BSL7	1.517	1.6012
										17	INF	0.500

※ formula (2)=0.014*v di+2.5

Table 5

(5-1)

Face NO.	k	A4	A6	A8	A10
						9	-0.69	-2.5930E-05	1.5126E-06	-3.7540E-08	-3.0122E-10
10	0.00	4.0013E-04	-3.7357E-06	-2.5573E-08	3.4067E-11
						14	0.00	8.6459E-04	-2.6059E-05	3.2865E-07	9.6568E-08
15	0.00	2.5423E-04	-3.2446E-05	-9.6602E-08	3.6215E-08

(5-2)

F	8.968	14.326	22.880
				Fno	2.000	2.000	2.000
ω	20.093	11.993	7.384
				3	1.430	6.414	10.778
8	16.468	10.300	4.777
				15	5.471	6.655	7.814

(5-3)

f1	38.837
		f2	-11.074
g3	10.922

Table 6

Face No	12
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-3.712E-04
C02	2.200E-05
		C03	-2.000E-06
C04	9.701E-08

Embodiment 3

1) composition of optical system

Fig. 9 is the saturating of the lens composition during infinity focusing of the optical system wide-angle side representing embodiments of the invention 3 Mirror profile, Figure 10 is the lens profile figure that the lens during infinity focusing representing telescope end are constituted.This optical system is burnt Away from variable varifocal optical system, successively by there is the first battery of lens 1G of positive refractive power, there is negative refractive power from object side The second battery of lens 2G and have positive refractive power the 3rd battery of lens 3G constitute.

First battery of lens 1G is by engaging the bent moon with negative refractive power convex surface facing object side from object side successively Lens and have positive refractive power biconvex lens cemented lens constitute.Second battery of lens 2G from object side successively by convex surface Towards the meniscus lens with negative refractive power of object side with engage and there is the biconcave lens of negative refractive power and convex surface facing thing The cemented lens of the meniscus lens with positive refractive power on side is constituted.3rd battery of lens 3G from object side successively by just having The biconvex lens of refractive power, the joint engaging the biconvex lens with positive refractive power and the biconcave lens with negative refractive power are saturating Mirror and have positive refractive power biconvex lens constitute.Here, the 3rd battery of lens 3G be mention in the present invention above-mentioned specify saturating Mirror group.Additionally, the biconvex lens near object side configuration of the 3rd battery of lens 3G is the first lens mentioned in the present invention, structure The biconvex lens becoming above-mentioned cemented lens is the second lens mentioned in the present invention.Constitute the cemented lens of the first battery of lens 1G The composition surface of the above-mentioned cemented lens that composition surface and the 3rd battery of lens 3G are comprised is respectively diffraction surfaces DOE.Further, the second lens It is configured with aperture diaphragm between group 2G and the 3rd battery of lens 3G.

In the optical system of this embodiment 3, from wide-angle side to telescope end zoom time, the first battery of lens 1G fixes, and second is saturating Mirror group 2G moves to object side to image planes side shifting, the 3rd battery of lens 3G.

2) numerical example

Secondly, the numerical example that this optical system introduces concrete numerical value illustrates.Table 7 shows this light The lens data of system, shows the aspheric asphericity coefficient shown in table 7, shows in table 8 (8-2) in table 8 (8-1) On the wide-angle side of this optical system, middle focal length, telescope end respective focal length (F), F value (Fno), angle of half field-of view (ω), optical axis Each variable interval.Showing the focal length of each battery of lens that this optical system had in table 8 (8-3), f1 is the first battery of lens The focal length of 1G, f2 is the focal length of the second battery of lens 2G, and f3 is the focal length of the 3rd battery of lens 3G.About the first battery of lens 1G and the 3rd The diffraction surfaces comprised in battery of lens 3G, table 9 shows that (face No), diffraction progression (m), standardized wavelength (λ), diffraction are numbered in its face Face coefficient (C01, C02, C03, C04).Further, table 19 shows conditional (1)～the numerical value of conditional (19).

Further, what Figure 11 represented is the longitudinal aberration figure during infinity focusing of this optical system wide-angle side, and Figure 12 represents It it is the longitudinal aberration figure during infinity focusing of this optical system telescope end.

Table 7

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	18.580	0.982	1.8467	23.78	0.672	0.711	FDS90	1.847	2.1671
2#	13.598	2.742	1.5182	58.96	0.787	0.633	E-C3	1.518	1.6746
										3	-130.565	d3
4	68.680	0.700	1.4875	70.44	0.836	0.619	FC5	1.487	1.5138
										5	14.147	1.811
6	-14.388	0.700	1.7433	49.22	0.770	0.638	NBF1	1.743	1.8109
										7	15.847	1.715	1.9459	17.98	0.646	0.749	FDS18	1.946	2.2483
8	47.188	d8
										9	INF	d9
10*	8.047	4.700	1.6188	63.85	0.788	0.630	M-PCD4	1.619	1.6061
										11*	-14.895	0.150
12	7.402	2.500	1.4875	70.44	0.836	0.619	FC5	1.487	1.5138
										13#	-15.908	0.600	1.7408	27.76	0.690	0.700	E-FD13	1.741	2.1114
14	4.451	2.112
										15*	39.241	2.427	2.0018	19.32	0.650	0.739	M-FDS2	2.002	2.2295
16*	-32.865	d16
										17	INF	1.200	1.5168	64.20	0.821	0.623	S-BSL7	1.517	1.6012
18	INF	d18

※ formula (2)=-0.014*v di+2.5

Table 8

(8-1)

Face NO.	k	A4	A6	A8	A10
						10	-0.69	-5.1513E-05	2.6048E-06	-3.2572E-08	0.0000E+00
11	0.00	4.0036E-04	-2.5713E-06	-4.2274E-09	0.0000E+00
						15	0.00	8.8324E-04	-3.4974E-05	1.5655E-06	0.0000E+00
16	0.00	3.8533E-04	-3.5592E-05	6.8577E-07	0.0000E+00

(8-2)

F	9.168	14.686	23.473
				Fn0	1.714	1.859	2.093
ω	19.556	11.671	7.183
				3	1.430	6.414	10.778
8	12.117	7.133	2.769
				9	4.352	3.167	2.008
16	5.471	6.655	7.814
				18	0.731	-0.731	-0.019

(8-3)

f1	38.683
		f2	-11.074
f3	10.999

Table 9

(9-1)

Face No	2
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-5.900E-05
C02	-6.234E-08
		C03	1.171E-08
C04	-1.352E-10

(9-2)

Face No	13
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-5.309E-04
C02	-9.000E-06
		C03	1.000E-06
C04	-1.445E-08

Embodiment 4

1) composition of optical system

Figure 13 is the saturating of the lens composition during infinity focusing of the optical system wide-angle side representing embodiments of the invention 4 Mirror profile, Figure 14 is the lens profile figure that the lens during infinity focusing representing telescope end are constituted.This optical system is burnt Away from variable varifocal optical system, successively by there is the first battery of lens 1G of negative refractive power, there is positive refractive power from object side The second battery of lens 2G, have negative refractive power the 3rd battery of lens 3G and have positive refractive power the 4th battery of lens 4G constitute.

First battery of lens 1G from object side successively by convex surface facing object side, there is the meniscus lens of negative refractive power, tool The biconcave lens having negative refractive power, the biconvex lens with positive refractive power and have negative refractive power biconcave lens constitute.Second Battery of lens 2G from object side successively by there is the biconvex lens of positive refractive power, aperture diaphragm and engaging convex surface facing object The cemented lens of the meniscus lens with negative refractive power of side and the biconvex lens with positive refractive power is constituted.3rd battery of lens 3G It is made up of the biconcave lens with negative refractive power and the biconvex lens with positive refractive power successively from object side.4th battery of lens 4G is made up of the biconvex lens with positive refractive power.Here, the second battery of lens 2G be mention in the present invention above-mentioned specify saturating Mirror group.The composition surface of the cemented lens constituting the second battery of lens 2G is diffraction surfaces DOE.Additionally, constitute the double of above-mentioned cemented lens Convex lens is the first lens mentioned in the present invention, and the second battery of lens 2G is this at the biconvex lens configured near object side The second lens mentioned in invention.

In the optical system of this embodiment 4, from wide-angle side to telescope end zoom time, the first battery of lens 1G draws convex track To image planes side shifting, the second battery of lens 2G moves to object side, and the 3rd battery of lens 3G draws convex track and moves to object side, the Four battery of lens 4G fix.

2) numerical example

Secondly, the numerical example that this optical system introduces concrete numerical value illustrates.Table 10 shows this light The lens data of system, table 11 (11-1) shows that the aspheric asphericity coefficient shown in table 10, table 11 (11-2) illustrate The wide-angle side of this optical system, middle focal length, the respective focal length of telescope end (F), F value (Fno), angle of half field-of view (ω), optical axis On each variable interval.Table 11 (11-3) shows the focal length of each battery of lens that this optical system had, and f1 is the first lens The focal length of group 1G, f2 is the focal length of the second battery of lens 2G, and f3 is the focal length of the 3rd battery of lens 3G, and f4 is Jiao of the 4th battery of lens 4G Away from.About the diffraction surfaces comprised in the second battery of lens 2G, table 12 showing, (face No), diffraction progression (m), standard are numbered in its face Change wavelength (λ), diffraction surfaces coefficient (C01, C02, C03, C04).Further, table 19 shows conditional (1)～conditional (19) Numerical value.

Further, what Figure 15 represented is the longitudinal aberration figure during infinity focusing of this optical system wide-angle side, and Figure 16 represents It it is the longitudinal aberration figure during infinity focusing of this optical system telescope end.

Table 10

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	20.859	0.500	1.8830	40.80	0.499	0.565	TAFD30	1.883	1.9288
2	9.500	7.875
										3	-73.957	0.500	1.6385	55.45	0.529	0.547	BACD18	1.639	1.7237
4	12.285	1.444
										5*	17.692	5.301	1.9027	31.00	0.478	0.594	L-LAH86	1.903	2.0660
6	-22.700	0.412
										7	-18.438	0.500	1.6188	63.85	0.537	0.542	M-PCD4	1.619	1.6061
8*	18.285	d8
										9*	11.239	4.168	1.5920	67.02	0.551	0.536	M-PCD51	1.592	1.5617
10*	-29.794	0.100
										11	INF	2.768
12	26.460	0.480	1.8000	29.84	0.472	0.602	S-NBH55	1.800	2.0822
										13#	7.247	3.323	1.4875	70.44	0.573	0.530	FC5	1.487	1.5138
14	-26.997	d14
										15	-12.976	0.500	1.6200	36.30	0.492	0.587	E-F2	1.620	1.9918
16	12.988	1.134
										17	19.171	1.586	1.8503	32.27	0.476	0.593	S-LAH71	1.850	2.0482
18	-57.591	d18
										19*	30.968	2.370	1.4971	81.56	0.545	0.538	M-FCD1	1.497	1.3582
20*	-13.411	0.100
										21	INF	1.500	1.5168	64.20	0.821	0.623	BSC7	1.517	1.6012
22	INF	5.400

※ formula (2)=-0.014*v di+2.5

Table 11

(11-1)

Face NO.	k	A4	A6	A8	A10
						5	0.00	-9.6959E-05	1.8072E-06	-2.0709E-08	1.8215E-10
8	0.00	-2.5182E-04	2.5917E-06	-3.2052E-08	2.2086E-10
						9	0.00	-1.0146E-04	3.3365E-07	-9.5110E-09	3.7357E-11
10	0.00	6.6062E-05	2.7714E-07	-6.8887E-09	4.9588E-11
						19	0.00	5.3488E-04	1.7167E-05	3.8292E-07	2.4674E-08
20	0.00	6.5212E-04	4.0285E-05	-1.8054E-06	1.2744E-07

(11-2)

F	3.086	9.525	31.119
				Fno	1.239	2.771	6.258
ω	57.755	18.869	5.823
				8	38.343	9.721	0.162
14	2.625	10.381	32.167
				18	0.100	2.535	10.536

(11-3)

f1	-9.903
		f2	13.957
f3	-34.245
		f4	19.166

Table 12

Face No	13
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-2.343E-04
C02	4.019E-07
		C03	-6.624E-08
C04	5.796E-11

Embodiment 5

1) composition of optical system

Figure 17 is the saturating of the lens composition during infinity focusing of the optical system wide-angle side representing embodiments of the invention 5 Mirror profile, Figure 18 is the lens profile figure that the lens during infinity focusing representing telescope end are constituted.This optical system is burnt Away from variable varifocal optical system, successively by there is the first battery of lens 1G of positive refractive power, there is negative refractive power from object side The second battery of lens 2G, have positive refractive power the 3rd battery of lens 3G and have positive refractive power the 4th battery of lens 4G constitute.

First battery of lens 1G from object side successively by engaging the bent moon with negative refractive power convex surface facing object side Lens and there is the cemented lens of biconvex lens of positive refractive power and saturating convex surface facing the bent moon with positive refractive power of object side Mirror is constituted.Second battery of lens 2G from object side successively by there is the biconcave lens of negative refractive power and engaging there is negative refractive power The biconcave lens of power and the cemented lens composition of the meniscus lens with positive refractive power convex surface facing object side.3rd battery of lens 3G is made up of the meniscus lens with positive refractive power convex surface facing object side.4th battery of lens 4G is by having the double of positive refractive power The cemented lens of biconcave lens that convex lens and engaging has negative refractive power and the biconvex lens with positive refractive power is constituted. Here, the 4th battery of lens 4G is the above-mentioned battery of lens specified mentioned in the present invention.Constitute the cemented lens of the 4th battery of lens 4G Composition surface be diffraction surfaces DOE.Additionally, in the 4th battery of lens 4G, the biconvex lens constituting above-mentioned cemented lens is in the present invention The first lens mentioned, are the second lens mentioned in the present invention at the biconvex lens configured near object side.Further, The object side of three battery of lens 3G is configured with aperture diaphragm.

In the optical system of this embodiment 5, from wide-angle side to telescope end zoom time, the first battery of lens 1G fixes, and second is saturating Mirror group 2G is fixed to image planes side shifting, the 3rd battery of lens 3G, and the 4th battery of lens moves to object side respectively with different tracks, the Four battery of lens 4G draw convex track and move to object side.

2) numerical example

Secondly, the numerical example that this optical system introduces concrete numerical value illustrates.Table 13 shows this light The lens data of system, table 14 (14-1) shows that the aspheric asphericity coefficient shown in table 13, table 14 (14-2) illustrate The wide-angle side of this optical system, middle focal length, the respective focal length of telescope end (F), F value (Fno), angle of half field-of view (ω), optical axis On each variable interval.Showing the focal length of each battery of lens that this optical system had in table 14 (14-3), f1 is first saturating The focal length of mirror group 1G, f2 is the focal length of the second battery of lens 2G, and f3 is the focal length of the 3rd battery of lens 3G, and f4 is the 4th battery of lens 4G's Focal length.About the diffraction surfaces comprised in the 4th battery of lens 4G, table 15 shows its face numbering (face No), diffraction progression (m), mark Standardization wavelength (λ), diffraction surfaces coefficient (C01, C02, C03, C04).Further, table 19 shows conditional (1)～conditional (19) numerical value.

Further, what Figure 19 represented is the longitudinal aberration figure during infinity focusing of this optical system wide-angle side, and Figure 20 represents It it is the longitudinal aberration figure during infinity focusing of this optical system telescope end.

Table 13

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	58.529	1.000	1.8467	23.78	0.455	0.619	FDS90	1.847	2.1671
2	27.640	8.838	1.5928	68.62	0.528	0.544	FCD515	1.593	1.5393
										3	-184.699	0.150
4	23.729	3.757	1.6385	55.45	0.529	0.547	BACD18	1.639	1.7237
										5	92.840	d5
6	-143.393	0.700	1.8830	40.80	0.499	0.565	TAFD30	1.883	1.9288
										7	8.289	2.778
8	-18.129	1.000	1.6968	55.46	0.545	0.543	LAC14	1.697	1.7236
										9	9.418	2.075	1.9212	23.96	0.457	0.620	FDS24	1.921	2.1646
10	285.004	d10
										11	INF	0.827
12*	12.466	2.578	1.5533	71.68	0.536	0.540	M-FCD500	1.553	1.4965
										13*	84.596	d13
14*	12.942	2.592	1.5533	71.68	0.536	0.540	M-FCD500	1.553	1.4965
										15*	-28.489	0.300
16	-28.680	0.700	1.7174	29.50	0.471	0.603	E-FD1	1.717	2.0870
										17#	10.088	2.424	1.6204	60.34	0.546	0.539	BACD16	1.620	1.6552
18	-16.829	d18
										19	INF	1.500	1.5168	64.20	0.821	0.623	S-BSL7	1.517	1.6012
20	INF	2.670

※ formula (2)=-0.014*v di+2.5

Table 14

(14-1)

Face NO.	k	A4	A6	A8	A10
						12	0.00	-1.5336E-04	-1.1094E-06	-1.9116E-08	-1.0995E-09
13	0.00	-1.1849E-04	3.4898E-07	-7.0104E-08	-2.6431E-10
						14	0.00	-1.4108E-04	2.5968E-06	-7.3425E-08	2.0901E-09
15	0.00	6.4100E-05	3.1479E-06	-6.0588E-08	1.6423E-09

(14-2)

F	5.146	15.737	48.922
				Fno	1.431	1.666	1.673
ω	34.342	11.341	3.597
				5	1.200	13.343	21.106
10	21.829	9.686	1.923
				13	9.040	6.710	9.697
18	7.413	9.743	6.755

(14-3)

f1	35.412
		f2	-7.414
f3	26.091
		f4	16.291

Table 15

Face No	17
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-3.005E-04
C02	2.000E-05
		C03	-1.000E-06
C04	1.590E-08

Embodiment 6

1) composition of optical system

Figure 21 is the saturating of the lens composition during infinity focusing of the optical system wide-angle side representing embodiments of the invention 6 Mirror profile, Figure 22 is the lens profile figure that the lens during infinity focusing representing telescope end are constituted.This optical system is burnt Away from variable varifocal optical system, successively by there is the first battery of lens 1G of positive refractive power, there is negative refractive power from object side The second battery of lens 2G, have positive refractive power the 3rd battery of lens 3G and have positive refractive power the 4th battery of lens 4G constitute.

First battery of lens 1G from object side successively by engaging the bent moon with negative refractive power convex surface facing object side Lens and there is the cemented lens of biconvex lens of positive refractive power and saturating convex surface facing the bent moon with positive refractive power of object side Mirror is constituted.Second battery of lens 2G from object side successively by convex surface facing object side the meniscus lens with negative refractive power and The cemented lens engaging the biconcave lens with negative refractive power and the biconvex lens with positive refractive power is constituted.3rd battery of lens 3G is made up of the meniscus lens with positive refractive power convex surface facing object side.4th battery of lens 4G is by having the double of positive refractive power The cemented lens of biconcave lens that convex lens and engaging has negative refractive power and the biconvex lens with positive refractive power is constituted. Here, the first battery of lens 1G is the above-mentioned battery of lens specified mentioned in the present invention.Constitute the cemented lens of the first battery of lens 1G Composition surface and constitute the object side of meniscus lens of the 3rd battery of lens and be respectively diffraction surfaces DOE.Additionally, the first battery of lens 1G In, the biconvex lens constituting above-mentioned cemented lens is the first lens mentioned in the present invention, double configure near object side Convex lens is the second lens mentioned in the present invention.Further, the object side at the 3rd battery of lens 3G is configured with aperture diaphragm.

In the optical system of this embodiment 6, from wide-angle side to telescope end zoom time, the first battery of lens 1G fixes, and second is saturating Mirror group 2G is fixed to image planes side shifting, the 3rd battery of lens 3G, and the 4th battery of lens moves to object side respectively with different tracks, the Four battery of lens 4G draw convex track and move to object side.

2) numerical example

Secondly, the numerical example that this optical system introduces concrete numerical value illustrates.Table 16 shows this light The lens data of system, table 17 (17-1) shows that the aspheric asphericity coefficient shown in table 16, table 17 (17-2) illustrate The wide-angle side of this optical system, middle focal length, the respective focal length of telescope end (F), F value (Fno), angle of half field-of view (ω), optical axis On each variable interval.Table 17 (17-3) shows the focal length of each battery of lens that this optical system had, and f1 is the first lens The focal length of group 1G, f2 is the focal length of the second battery of lens 2G, and f3 is the focal length of the 3rd battery of lens 3G, and f4 is Jiao of the 4th battery of lens 4G Away from.About the diffraction surfaces comprised in the first battery of lens 1G and the 3rd battery of lens 3G, table 18 shows its face numbering (face No), spreads out Penetrate progression (m), standardized wavelength (λ), diffraction surfaces coefficient (C01, C02, C03, C04).Further, table 19 shows conditional ～the numerical value of conditional (19) (1).

Further, what Figure 23 represented is the longitudinal aberration figure during infinity focusing of this optical system wide-angle side, and Figure 24 represents Be this optical system telescope end infinity focusing time longitudinal aberration figure.

Table 16

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	47.632	1.000	1.8467	23.78	0.455	0.619	FDS90	1.847	2.1671
2#	29.296	6.500	1.5935	67.00	0.552	0.537	PCD51	1.593	1.5620
										3	-309.939	0.150
4	27.817	3.945	1.6968	55.46	0.545	0.543	LAC14	1.697	1.7236
										5	81.483	d5
6	496.669	0.700	1.8830	40.80	0.499	0.565	TAFD30	1.883	1.9288
										7	8.853	3.235
8	-12.527	1.000	1.6968	55.46	0.545	0.543	LAC14	1.697	1.7236
										9	12.362	3.143	1.9212	23.96	0.457	0.620	FDS24	1.921	2.1646
10	-125.651	d10
										11	INF	1.905
12*#	12.897	2.485	1.5920	67.02	0.551	0.536	M-PCD51	1.592	1.5617
										13*	54.767	d13
14*	15.218	3.189	1.4971	81.56	0.545	0.538	M-FCD1	1.497	1.3582
										15*	-13.939	0.300
16	-19.701	0.700	1.5927	35.45	0.485	0.593	FF5	1.593	2.0037
										17	13.332	3.383	1.4970	81.61	0.544	0.539	FCD1	1.497	1.3575
18	-14.419	d18
										19	INF	1.500	1.5168	64.20	0.821	0.623	S-BSL7	1.517	1.6012
20	INF	2.670

※ formula (2)=-0.014*v di+2.5

Table 17

(17-1)

Face NO.	k	A4	A6	A8	A10
						12	0.00	-2.3790E-04	-2.5175E-06	-5.2102E-09	-2.7683E-09
13	0.00	-2.4892E-04	8.9631E-08	-1.2327E-07	-2.0564E-10
						14	0.00	-1.8969E-04	1.3487E-06	-1.2750E-07	1.9589E-09
15	0.00	1.4077E-04	1.1812E-06	-1.2462E-07	2.0293E-09

(17-2)

F	5.140	15.721	48.583
				Fno	1.440	1.584	1.649
ω	35.066	11.203	3.598
				5	0.471	12.869	20.785
10	20.978	8.580	0.665
				13	8.012	5.670	8.381
18	7.316	9.659	6.947

(17-3)

f1	36.168
		f2	-7.504
f3	27.269
		f4	16.572

Table 18

(18-1)

Face No	2
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-1.020E-04
C02	5.890E-08
		C03	-3.183E-10
C04	6.091E-13

(18-2)

Face No	12
		Diffraction progression	1
Standardized wavelength	500nm
		C01	-3.359E-04
C02	6.167E-06
		C03	-1.756E-07
C04	1.603E-09

Comparative example

Secondly, comparative example is illustrated.Here, as comparative example, enumerate and there are the lens almost identical with embodiment 1 The varifocal optical system that the positive negative two groups constituted is constituted.The lens of the optical system of comparative example are constituted and embodiment 2 almost phase With, thus in this description will be omitted and diagram.Further, table 20 shows the lens data of this optical system.Further, table 21 (21-1) Show that the aspheric asphericity coefficient shown in table 20, table 21 (21-2) show the wide-angle side of this optical system, middle Jiao Away from, each variable interval on the respective focal length of telescope end (F), F value (Fno), angle of half field-of view (ω), optical axis.Further, table 21 (21- 3) showing the focal length of each battery of lens that this optical system had in, f1 is the focal length of the first battery of lens 1G, and f2 is second saturating The focal length of mirror group 2G.

Table 20

Face NO.	r	d	nd	vd	θCs	θgF	Glass material	Ndi	Formula (2) value
										1	41.3	0.9	1.911	35.25	0.486	0.582	TAFD35_HOYA	1.911	2.0065
2	9.61	4.992
										3	-34.75	0.7	1.773	49.6	0.526	0.552	SLAH66_OHARA	1.773	1.8056
4	12.9	1.344
										5	16.91	3	1.946	17.98	0.438	0.654	FDS18_HOYA	1.946	2.2483
6	92.81	23.49
										7	0	7.2
8*	17.71	1.5	1.592	67.02	0.551	0.536	MPCD51_HOYA	1.592	1.5617
										9*	35.113	0.1
10#	13.65	5.05	1.497	81.54	0.543	0.537	SFPL51_OHARA	0.178	1.3584
										11	-13.65	0.1
12	42.7	0.7	1.581	40.75	0.502	0.577	STIL25_OHARA	-0.554	1.9295
										13*	7.4	4.45	1.497	81.54	0.543	0.537	SFPL51_OHARA	0.178	1.3584
14*	-15.18	0.6	1.603	38.03	0.495	0.583	STIM5_OHARA	-0.586	1.9676
										15	9.81	0.444
16	17.7	2.4	1.773	49.6	0.526	0.552	SLAH66_OHARA	-0.186	1.8056
										17	-26.14	6.35

※ formula (2)=-0.014*v di+2.5

Table 21

(21-1)

Face NO.	k	A4	A6	A8	A10
						8	2.0600E+00	-6.3963E-05	-1.8163E-06	-1.8715E-07	2.3779E-09
9	1.5000E+00	1.9628E-04	-1.3522E-06	-1.7275E-07	2.6750E-09

(21-2)

F	2.92	4.8	7.7
				Fno	1.261	1.535	2.037
ω	78.258	41.815	25.39
				8	23.492	11.149	6.466
9	7.2	4.634	0.595
				16	6.35	8.916	12.955

(21-3)

f1	-8.97472
		f2	12.385

For optical system and the optical system of above-mentioned comparative example of embodiment 2, Figure 25 and Figure 26 respectively illustrates t The temperature change of the back focus of line, s line, d line and F line.Understand embodiment 2 and comparative example optical system back focus all along with The change of ambient temperature and change, but compared with the optical system of comparative example, the amount of change of the optical system of embodiment 2 is little.Real Execute in the optical system of example 2, when back focus when 20 DEG C is set to benchmark, the amount of change of back focus when 60 DEG C be 0.01mm with Under (with reference to Figure 25).In contrast, in the optical system of comparative example, when back focus when 20 DEG C is set to benchmark, when 60 DEG C The amount of change of back focus is more than 0.02mm (with reference to Figure 26).Especially, in the optical system of comparative example, variation of ambient temperature is led The variation of the axial colour residual quantity caused is big, and compared with during room temperature, the difference of F line and d line is 0.5 μm in wide-angle side, is 3 at telescope end μm.In the optical system of embodiment 2, this difference is 0.2 μm in wide-angle side, is 0.6 μm at telescope end, relative to the light of embodiment 2 System, the optical system amplitude of fluctuation of comparative example is more than 1 times.Additionally, for the optical system of comparative example, conditional (1) value is-6.2, it is shown that big negative value.

Further, for the optical system of other embodiments, the change of the back focus that variation of ambient temperature causes is little, also can Enough suppress the variation of each aberrations such as axial chromatic aberration.

Industrial applicibility

According to the present invention it is possible to while miniaturization and lightweight being provided and realizing chromatic aberration correction highly, environment temperature It also is able to maintain optical system and the camera head of good imaging performance during degree change.

Claims (23)

1. an optical system, it is characterised in that

There is the battery of lens that least one set comprises diffraction surfaces,

When in the battery of lens that will comprise this diffraction surfaces the most any one group is as the battery of lens specified,

In this battery of lens specified, the refractive power of refractive power same-sign that will have shown by the battery of lens entirety specified with this In the lens of power, the lens of refractive power maximum are as the first lens,

In this battery of lens specified, the refractive power of refractive power same-sign that will have shown by the battery of lens entirety specified with this Described in the lens of power, any one lens beyond the first lens are as lens,

Described first lens meet following conditional (1),

Described lens meet following conditional (2),

dndtP1×10⁶>-5 …(1)

Ndi≥-0.014×νdi+2.5 …(2)

Wherein, " dndt " be more than 20 DEG C the temperature range of less than 40 DEG C for 632.8nm wavelength light, in vacuum thoroughly The temperature coefficient (absolute dn/dT) of the absolute index of refraction of mirror, " dndtP1 " is the dndt of described first lens, and " Ndi " is Described lens are for the refractive index of d line, and " ν di " is the described lens Abbe numbers for d line, and " d line " is 587.56nm The light of wavelength.

2. optical system as claimed in claim 1, wherein, described first lens meet following conditional (3),

Nd1<-0.02×νd1+2.95 …(3)

Wherein, " Nd1 " is described first lens refractive indexs for d line, and " ν d1 " is described first lens Abbe for d line Number.

3. optical system as claimed in claim 1, wherein, described first lens meet following conditional (4),

αP1×10⁷>120 …(4)

Wherein, " α P1 " is that described first lens are in the temperature range specified comprising more than 0 DEG C 40 DEG C of temperature below scopes The value of average coefficient of linear expansion α (-30/70).

4. optical system as claimed in claim 1, wherein, the described battery of lens specified meets following conditional (5),

-65<dndtP1×Fg×Pw1×10⁷<65 …(5)

Wherein, " Fg " is the focal length of the described battery of lens specified, and " Pw1 " is the refractive power of described first lens.

5. optical system as claimed in claim 1, wherein, the described battery of lens specified is except described first lens and described the The most at least there are beyond lens lens, and meet following conditional (6), 0 < Σ doe{ ν dx/fx} × ft≤150 …(6)

Wherein, " Σ doe{ ν dx/fx} " be constitute the described battery of lens specified each lens { ν d/fi} value sum, " ν dx " is Constituting each lens Abbe number for d line of the described battery of lens specified, " fx " is each of the described battery of lens specified of composition The focal length of mirror, " ft " is the maximum focal length that this optical system can show.

6. optical system as claimed in claim 1, wherein, by following phase function formulaRepresent described diffraction surfaces Time, this optical system meets following conditional (7),

Wherein, " m " is diffraction progression, and " λ " is standardized wavelength, and " C01 ", " C02 ", " C03 ", " C04 " are diffraction surfaces coefficients, " h " is the length in same radial from optical axis, and " Fg " is the focal length of the described battery of lens specified.

7. optical system as claimed in claim 1, wherein, by following phase function formulaRepresent described diffraction surfaces Time, this optical system meets following conditional (8),

Wherein, " m " is diffraction progression, and " λ " is standardized wavelength, and " C01 ", " C02 ", " C03 ", " C04 " are diffraction surfaces coefficients, " h " is the length in same radial from optical axis, and " ω w " is the half field-of-view on the minimum focus that this optical system can show Angle, " fw " is the minimum focus that this optical system can show.

8. optical system as claimed in claim 1, wherein, this optical system meets following conditional (9),

-0.05≤Δ(d-s)/f≤0.05 …(9)

Wherein, " f " is any focal length that this optical system entirety can show, " Δ (d-s) " is this optical system entirety institute energy The paraxial imagery position of the s line for d line on any focal length of display, " s line " is the light of 852.11nm wavelength.

9. optical system as claimed in claim 1, wherein, described in there are the lens of diffraction surfaces meet following conditional (10),

-3.0≤Σ{θCs/(fd×νd)}/Σ{1/(fd×νd)}≤3.0 …(10)

Wherein, θ Cs=(nC-ns)/(nF-nC), " nC " is for having the lens of diffraction surfaces described in C line (656.27nm) Refractive index, " ns ", for having the refractive index of the lens of diffraction surfaces described in s line (852.11nm), " nF " is for F line (486.13nm) having the refractive index of the lens of diffraction surfaces described in, " fd " is the lens this of d line to diffraction surfaces Focal length, " ν d " is the Abbe number of the lens this of d line to diffraction surfaces.

10. optical system as claimed in claim 1, wherein, described in there are the lens of diffraction surfaces meet following conditional (11),

-15≤Σ{1/(fd×νd)}/Σ{θgF/(fd×νd)}≤15 …(11)

Wherein, θ gF=(ng-nF)/(nF-nC), " ng " is for having the lens of diffraction surfaces described in g line (435.84nm) Refractive index, " nF ", for having the refractive index of the lens of diffraction surfaces described in F line (486.13nm), " nC " is for C line (656.27nm) having the refractive index of the lens of diffraction surfaces described in, " ns " spreads out for having described in s line (852.11nm) Penetrating the refractive index of the lens in face, " fd ", for having the focal length of the lens of diffraction surfaces described in d line, " ν d " is for d line The Abbe number of the described lens with diffraction surfaces.

11. optical systems as claimed in claim 1, wherein, the described battery of lens specified meets following conditional (12),

0<νd1/Pw1/fw<1300 …(12)

Wherein, " ν d1 " is described first lens Abbe numbers for d line, and " Pw1 " is the refractive power of described first lens, " fw " It it is the minimum focus that can show of this optical system.

12. optical systems as claimed in claim 1, wherein, this optical system meets following conditional (13),

-100<dndtP1×Pw1×fw×10⁷<40 …(13)

Wherein, " Pw1 " is the refractive power of described first lens, and " fw " is the minimum focus that this optical system can show.

13. optical systems as claimed in claim 1, wherein, this optical system meets following conditional (14),

-130<dndtP1×Pw1×ft×10⁷<260 …(14)

Wherein, " Pw1 " is the refractive power of described first lens, and " ft " is the maximum focal length that this optical system can show.

14. optical systems as claimed in claim 1, wherein, in the described battery of lens specified, saturating with what this was specified having In the lens of the refractive power of the refractive power same-sign shown by mirror group entirety, the lens second largest for refractive power are set to second saturating During mirror, described first lens and described second lens meet following conditional (15),

-130<dndtP1×Pw1×fw+dndtP2×Pw2×fw×10⁷<0 …(15)

Wherein, " dndtP2 " is the described dndt of described second lens, and " Pw1 " is the refractive power of described first lens, and " Pw2 " is The refractive power of described second lens, " fw " is the minimum focus that this optical system can show.

15. optical systems as claimed in claim 1, wherein, in the described battery of lens specified, saturating with what this was specified having In the lens of the refractive power of the refractive power same-sign shown by mirror group entirety, the lens second largest for refractive power are set to second saturating During mirror, described first lens and described second lens meet following conditional (16),

Wherein, " dndtP2 " is the described dndt of described second lens, and " Pw1 " is the refractive power of described first lens, and " Pw2 " is The refractive power of described second lens, " fw " is the minimum focus that this optical system can show, " ft " is this optical system institute energy The maximum focal length of display.

16. optical systems as claimed in claim 1, wherein, described first lens meet following conditional (3-a),

Nd1<-0.014×νd1+2.5 …(3-a)

Wherein, " Nd1 " is described first lens refractive indexs for d line, and " ν d1 " is described first lens Abbe for d line Number.

17. optical systems as claimed in claim 1, wherein, in the described battery of lens specified, saturating with what this was specified having In the lens of the refractive power of the refractive power same-sign shown by mirror group entirety, the lens second largest for refractive power are set to second saturating During mirror, described second lens meet following conditional (17),

Nd2≥-0.014×νd2+2.5 …(17)

Wherein, " Nd2 " is described second lens refractive indexs for d line, and " ν d2 " is described second lens Abbe for d line Number.

18. optical systems as claimed in claim 1, wherein, the number of lenses constituting the described battery of lens specified is more than 3 Less than 6.

19. optical systems as claimed in claim 1, wherein, the described battery of lens specified has positive refractive power.

20. optical systems as claimed in claim 1, wherein, this optical system is to have multiple lens group, this multiple lens group In the battery of lens of the most any one group be the described battery of lens specified, and carry out the change of zoom by changing the interval of each battery of lens Focus optical system.

21. optical systems as claimed in claim 1, wherein, possess and are configuring near object side and having positive refractive power First battery of lens, this first battery of lens comprises at least one cemented lens being made up of two lens, in this first battery of lens, Following conditional (18) is met at the cemented lens configured near object side,

30<|νa1-νa2|<50 …(18)

Wherein, " ν a1 " is the object side lens the constituting described cemented lens Abbe numbers for d line, and " ν a2 " is to connect described in composition Close the image planes side lens Abbe number for d line of lens.

22. optical systems as claimed in claim 1, wherein, possess and are configuring near object side and having positive refractive power First battery of lens, this first battery of lens comprise that the cemented lens being made up of two lens contacts with air layer with two sides single thoroughly Mirror, and meet following conditional (19),

0.21<|NPa1-NP1|<6 …(19)

Wherein, " NPa1 " is formed in the cemented lens configured near object side and has positive refractive power in being described first battery of lens The lens of power are for the refractive index of d line, and " NP1 " is to configure near object side and having positive refractive power in described first battery of lens The described simple lens of power is for the refractive index of d line.

23. 1 kinds of camera heads, it is characterised in that possess in claim 1～22 optical system described in any one and take the photograph Element, described imaging apparatus is arranged on the image planes side of this optical system, the optical imagery conversion that will be formed by this optical system For the signal of telecommunication.