JP2016045310A - Zoom lens and image capturing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens for a large format camera with a built-in extender, which offers a high zoom ratio, compact size and weight, compact extender in particular, and high optical performance over an entire zoom range, and an image capturing device having the same.SOLUTION: A zoom lens comprises, in order from the object side to the image side; a first lens group that does not move when zooming and has positive refractive power; a second lens group that moves when zooming and has negative refractive power; an R1 lens group including one or more lens groups that move when zooming and an aperture stop and has positive refractive power; an EXT lens group that is retractable from a light path; and an R2 lens group that does not move when zooming. A maximum ray height hR1 in the R1 lens group and a maximum ray height hEXT in the EXT lens group are appropriately set, where the maximum ray height in a lens group represents the largest value of ray heights, measured at lens surfaces included in the lens group, of a light ray that passes therethrough.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a zoom lens with a built-in extender suitable for a television camera, a video camera, a photographic camera, a broadcast television camera, and a movie camera, and more particularly, a telephoto zoom lens having a large aperture and a high magnification, and an imaging apparatus having the same. It is about.

  When shooting natural programs on TV etc. (for example, shooting animals and birds from a long distance outdoors), it can be used up to the focal length of the telephoto range with a high zoom ratio (for example, at a high magnification of 7 times or more, In addition, there is a demand for a zoom lens having a high optical performance and a half angle of view at the telephoto end of 3 degrees or less. In such shooting, since the camera is often held on the shoulder, there is a demand for a zoom lens that is smaller, lighter and more portable. In addition, there is a need for a zoom lens that is compatible with a camera having a large sensor (imaging device) that can capture images even in a low illumination environment. Therefore, there is an increasing demand for a high magnification and telephoto zoom lens suitable for moving image shooting, which is excellent in portability and functionality while supporting a large sensor exceeding one type.

  On the other hand, in order to cover a wide focal length range, various converter lenses that change the focal length range of the zoom lens to the long focal length side or the short focal length side have been proposed. In particular, it is known that a zoom lens for a television camera employs a built-in extender that can be inserted into and removed from an afocal optical path in a relay lens and can change the focal length range to the telephoto side. This method has an advantage that even if the focal length range is switched by inserting and removing the extender, the total lens length and the back focus do not change, and switching can be easily performed.

  In Patent Document 1, a zoom lens composed of four groups, a telephoto end angle of view of about 0.2 degrees when a built-in extender is inserted, and a zoom ratio of about 100 times, is a 2/3 type broadcast television camera. A high magnification zoom lens suitable for the above has been proposed.

  In Patent Document 2, a zoom lens composed of four groups, a telephoto end angle of view when a built-in extender is inserted is about 1.0 degree, and a zoom ratio is about 20 times. A high magnification zoom lens suitable for the above has been proposed.

JP 2012-27308 A JP 2012-185272 A

  In order to deal with a larger image pickup device with the zoom lens configuration of Patent Documents 1 and 2, the effective diameter on the image side is larger than the zooming group including the relay lens group and the extender, and the entire lens is reduced in size. Is difficult. In particular, the effective diameter of the built-in extender also increases, leading to an increase in the retracting space, weight and length of the extender.

  The present invention achieves the miniaturization of the extender by appropriately defining the arrangement of the relay lens between the zoom unit and the extender, and provides a small zoom lens that has a high zoom ratio and a telephoto lens corresponding to a large sensor. The purpose is to do.

The zoom lens according to the present invention includes a first lens group having a positive refractive power that does not move for zooming in order from the object side to the image side, a negative second lens group that moves during zooming, and at least one group that moves during zooming. Lens group, a positive refractive power R1 lens group including an aperture stop, an EXT lens group that can be retracted from the optical path, and an R2 lens group that does not move for zooming, and the R1 lens group includes the second lens group. A lens having the largest effective diameter between the lens group on the image side from the lens group and the EXT lens group, and the maximum ray height of the on-axis ray at the R1 lens group at the wide-angle end when focused at infinity When the height is hR1, the maximum ray height hEXT in the EXT lens group,
1.50 <hR1 / hEXT <3.50
And the axial light beam incident on the R1 lens group is a divergent light beam. Here, the maximum light ray height in a lens group refers to the largest value among the light ray heights on the lens surfaces of light rays passing through a plurality of lens surfaces included in the lens group.

  According to the present invention, a large zoom lens with a built-in extender realizes a high zoom ratio, a telephoto size, a small size, and a light weight, particularly a miniaturization of the extender, and has high optical performance over the entire zoom range from the wide-angle end to the telephoto end. A zoom lens and an image pickup apparatus having the same can be obtained.

FIG. 3 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to the first exemplary embodiment of the present invention. FIG. 6 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 484.20 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 1 is retracted. FIG. 7 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 726.30 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 1 is inserted. FIG. 6 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end of a zoom lens according to Example 2 of the present invention. FIG. 6 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 575.00 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 2 is retracted. FIG. 10 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 1035.00 mm, and (C) a telephoto end at an infinite object distance when an extender is inserted in Example 2. FIG. 6 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end of a zoom lens according to Embodiment 3 of the present invention. FIG. 10 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 484.20 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 3 is retracted. FIG. 10 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 726.30 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 3 is inserted. FIG. 9 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end of a zoom lens according to a fourth embodiment of the present invention. FIG. 6A is a longitudinal aberration diagram at the wide-angle end (A), (B) a focal length 482.09 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 4 is retracted. FIG. 10 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 723.14 mm, and (C) a telephoto end at an infinite object distance when the extender is inserted in Example 4. FIG. 10 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end of a zoom lens according to Example 5 of the present invention. FIG. 10 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 480.00 mm, and (C) a telephoto end at an object distance of infinity when the extender of Example 5 is retracted. FIG. 10 is a longitudinal aberration diagram at (A) a wide angle end, (B) a focal length of 719.23 mm, and (C) a telephoto end when an extender is inserted in Example 5; (A) is a schematic diagram of the principle of the present invention. (B) is a schematic diagram of a conventional structure. It is a principal part schematic of the imaging device of this invention.

Hereinafter, features of the zoom lens of the present invention will be described with reference to the accompanying drawings.
The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power that does not move for zooming, a negative second lens group that moves during zooming, and at least one group that moves during zooming. The lens unit includes an R1 lens group having a positive refractive power including an aperture stop, an EXT lens group that can be inserted into and removed from the optical path, and an R2 lens group that does not move for zooming.

  FIG. 1 is a lens cross-sectional view of a zoom lens according to Embodiment 1 of the present invention when focusing on an object at infinity at the wide-angle end and when retracting the extender (when removed from the optical path).

  U1 is a first lens unit having a positive refractive power that does not move for zooming. A part of the lens group of U1 moves to the object side when focusing from an object at infinity to an object at a short distance. U2 is a second lens unit (variator lens unit) having a negative refractive power for zooming that moves to the image side during zooming from the wide-angle end (short focal length end) to the telephoto end (long focal length end). U3 is a third lens group (compensator lens group) having a negative refractive power that moves in conjunction with the second lens group U2 and corrects image plane fluctuations accompanying zooming. UR1 includes an aperture stop SP that does not move during zooming, and is an R1 lens group (front relay lens group) that has a positive refractive power and does not move during zooming. UEXT is an EXT lens group (extender group) that can be inserted into and removed from the optical path and does not move for zooming. UR2 is an R2 lens group (rear relay lens group) that does not move during zooming. IP is an image plane and corresponds to the imaging plane of a solid-state imaging device (photoelectric conversion device). The group configuration described above is the same in Examples 1, 2, and 3 described later.

  Next, the lens configuration of each group in Example 1 will be described. Hereinafter, it is assumed that the lenses are arranged in order from the object side to the image side.

  The first lens unit U1 includes a positive lens, a negative lens, a positive lens, a negative lens, a positive lens, and six positive lenses. During focusing, the two positive lenses closest to the image side move. The second lens unit U2 includes one negative lens, a cemented lens of a negative lens and a positive lens, a negative lens, and a positive lens. The third lens unit U3 includes a cemented lens of a negative lens and a positive lens. The R1 lens unit UR1 includes two positive lenses, an aperture stop SP, a cemented lens of a positive lens and a negative lens, a positive lens, and a cemented lens of a negative lens and a positive lens. The R2 lens group UR2 includes a positive lens and two cemented lenses of a negative lens and a positive lens. The EXT lens group UEXT includes a positive lens, two cemented lenses of a negative lens and a positive lens, and a negative lens.

  In general, in the case of a zoom lens having a first lens group having a positive refractive power that does not move for zooming, a second lens group having a negative refractive power that moves during zooming, and a third lens group having a negative refractive power, The light beams emitted from the three lens groups are diverged. Therefore, when the R1 lens group for sufficiently reducing the increasing light beam diameter is not disposed, the effective axial beam diameter incident on the EXT lens group is increased. As a result, the extender lens diameter is increased, the space for storing the extender is increased, the lens barrel is thickened, and the length of the extender is increased, making it difficult to reduce the size of the lens. In the zoom lens of the present invention, in the R1 lens group, the light beam incident in the divergent state is once converged, and after the beam diameter is sufficiently reduced, the light beam is emitted approximately afocally, thereby reducing the size of the extender. It is possible to achieve both a high zoom ratio and a reduction in size and weight.

  The principle of the present invention will be described with reference to FIGS. FIG. 17A shows a schematic configuration after the second group of the zoom lens of the present invention. FIG. 17B is a schematic diagram showing the configuration of a conventional lens device in order to explain the advantages of the present invention. As shown in FIG. 17B, since the divergent light beam is emitted from the third lens unit U3, in the case of the conventional configuration in which the R1 lens group for reducing the light beam diameter is not disposed, the effective lens diameter of the extender is growing. On the other hand, in the case of the configuration of the present invention shown in FIG. 17A, the divergent light beam is once converged in the R1 group UR1, sufficiently reduced in the light beam diameter, and then converted into an afocal light beam.

  By arranging the extender for a light beam having a small effective beam diameter, it is possible to suppress an increase in the extender diameter, and to achieve both a high zoom ratio and a reduction in size and weight of the zoom lens.

  In the schematic diagram of FIG. 17, a lens unit having a positive refractive power is arranged on the object side of the R1 lens group, and a lens group having a negative refractive power is arranged on the image side, but the diverging incident light beam is substantially afocal. Further, the power arrangement is not limited as long as it is a power arrangement that reduces the light beam diameter than before incidence.

The zoom lens according to the present invention includes a first lens group having a positive refractive power that does not move for zooming in order from the object side to the image side, a negative second lens group that moves during zooming, and at least one group that moves during zooming. Lens group, an R1 lens group having a positive refractive power including an aperture stop, an EXT lens group that can be inserted into and removed from the optical path, and an R2 lens group that does not move for zooming. The R1 lens group includes a lens having the largest effective diameter from the second lens group to the EXT lens group, and the axial ray at the R1 lens group at the wide angle end when focusing on infinity. Is the maximum ray height hEXT, the maximum ray height hEXT in the EXT lens group,
1.50 <hR1 / hEXT <3.50 (1)
And the axial light beam incident on the R1 lens group is a divergent light beam.

  The effective diameter of the present invention refers to the light beam included in the on-axis light beam or the off-axis light beam with the maximum image height from the wide-angle end to the telephoto end, from infinite focus to close focus, It is defined as twice the maximum ray height on the surface. Moreover, the maximum light ray height in a lens group refers to the largest value among the light ray heights on the lens surfaces of light rays that pass through a plurality of lens surfaces included in the lens group.

  Conditional expression (1) defines the ratio of the maximum height of the light beam in the R1 group UR1 and the maximum height of the light beam in the EXT group UEEXT. By satisfying conditional expression (1), it is possible to achieve high optical performance in the entire zoom range, and at the same time, to reduce the lens diameter of the extender and to achieve a high zoom ratio. If the upper limit of conditional expression (1) is exceeded, the refractive power of individual lenses in the R1 group UR1 will increase, making it difficult to correct aberrations. If the lower limit of conditional expression (1) is exceeded, the effect of suppressing the extender diameter will be reduced, leading to an increase in the size of the lens barrel.

More preferably, conditional expression (1) should be set as follows.
1.80 <hR1 / hEXT <3.10 (1a)
By satisfying conditional expression (1), each embodiment of the present invention achieves a high zoom ratio, a small size and light weight of the extender, and a telephoto lens from the wide-angle end while being a zoom lens for a large format camera with a built-in extender. High optical performance can be achieved over the entire zoom range to the end.

As a further embodiment of the present invention, conditional expression (2) defines the ratio of the focal length fR1 of the R1 lens group and the combined focal length fR of the R1 lens group and the R2 lens group when the EXT lens group is retracted. .
0.25 <fR1 / fR <0.90 (2)

By satisfying conditional expression (2), it is possible to achieve high optical performance over the entire zoom range, high optical performance over the entire zoom range, and simultaneously reduce the extender lens diameter and shorten the overall relay length. It becomes. If the upper limit of conditional expression (2) is exceeded, the refractive power of the R1 lens group will be too weak, and it will be difficult to reduce the size of the extender. If the lower limit of conditional expression (2) is exceeded, the refractive power of the R1 lens group becomes too strong, and aberration correction becomes difficult. More preferably, conditional expression (2) should be set as follows.
0.34 <fR1 / fR <0.76 (2a)

As a further embodiment of the present invention, conditional expression (3) defines the ratio of the focal length fR1 of the R1 lens group and the focal length fR2 of the R2 lens group.
0.20 <fR1 / fR2 <0.50 (3)

By satisfying conditional expression (3), high optical performance can be achieved in the entire zoom range, and the lens diameter of the extender can be reduced. If the upper limit of conditional expression (3) is exceeded, the refractive power of the R1 lens group becomes too weak, and it becomes difficult to reduce the size of the extender. When the lower limit of conditional expression (3) is exceeded, the refractive power of the R1 lens unit becomes too strong, and aberration correction becomes difficult. More preferably, conditional expression (3) should be set as follows.
0.27 <fR1 / fR2 <0.40 (3a)

  As a further embodiment of the present invention, it is desirable that the R1 lens group has at least one cemented lens of a lens having a positive refractive power and a lens having a negative refractive power. When the achromaticity is insufficient in the R1 lens group having a large refractive power of each lens, it is difficult to achieve excellent optical performance. Preferably, it is preferable to have two cemented lenses of a lens having a positive refractive power and a lens having a negative refractive power.

  As a further embodiment of the present invention, it is desirable that the EXT lens group has at least one cemented lens of a lens having a positive refractive power and a lens having a negative refractive power. If achromaticity is insufficient in the EXT lens group, chromatic aberration occurs when the extender is inserted, and as a result, it becomes difficult to achieve excellent optical performance. Preferably, it is preferable to have two cemented lenses of a lens having a positive refractive power and a lens having a negative refractive power.

As a further embodiment of the present invention, conditional expression (4) defines the ratio of the diameter φ of the image circle when the EXT lens group is retracted to the largest effective diameter D in the EXT lens group.
0.20 <D / φ <1.20 (4)

However, the diameter φ of the image circle is defined by the following formula when the extender is retracted, the focal length at the wide-angle end and infinite focus is fw, and the half angle of view is ω.
φ = 2 × fw × tan ω

By satisfying conditional expression (4), it is possible to achieve high optical performance in the entire zoom range and to achieve both reduction in the lens diameter of the extender and high zoom ratio. If the upper limit of conditional expression (4) is exceeded, the lens diameter of the EXT lens group becomes too large, and it becomes difficult to reduce the size of the extender. If the lower limit of conditional expression (4) is exceeded, the refractive power of each lens in the R1 lens group UR1 will increase, making it difficult to correct aberrations. More preferably, conditional expression (4) should be set as follows.
0.45 <D / φ <1.00 (4a)

As a further embodiment of the present invention, according to conditional expression (5), the distance LR1 from the most object side surface of the R1 lens unit to the most image side surface, and from the most object side surface of the first lens unit to the image surface The ratio of the distance Ltotal is defined.
0.10 <LR1 / Ltotal <0.30 (5)

By satisfying conditional expression (5), it is possible to achieve high optical performance in the entire zoom range and to achieve both a reduction in the lens diameter of the extender and a high zoom ratio. If the upper limit of conditional expression (5) is exceeded, the total length of the R1 lens group becomes too long, resulting in a reduction in zoom ratio due to an increase in the total length of the zoom lens or a reduction in the total length of the zoom unit. If the lower limit of conditional expression (5) is exceeded, the refractive power of individual lenses in the R1 lens group UR1 will increase, making it difficult to correct aberrations. More preferably, conditional expression (5) should be set as follows.
0.11 <LR1 / Ltotal <0.20 (5a)

  As a further embodiment of the present invention, it is desirable that the R1 lens unit UR1 has at least one aspheric surface. At the wide-angle end, since the incident light beam is most spread when entering the R1 lens unit UR1, spherical aberration correction is most important. Spherical aberration correction is advantageous by disposing an aspheric surface in the R1 lens unit UR1 having a large refractive power of each lens.

As a further embodiment of the present invention, conditional expression (6) defines the combined lateral magnification βR of the R1 lens group and the R2 lens group at the wide-angle end when focusing on infinity.
−3.0 <βR <−1.8 (6)

By satisfying the conditional expression (6), it is possible to suppress the overall length of the zoom lens, correct aberration variation of the zoom lens well, and achieve both high zoom ratio and small size and light weight. If the upper limit of conditional expression (6) is exceeded, the combined lateral magnification of the R1 lens group and the R2 lens group becomes small, and a high zoom ratio cannot be achieved. In addition, if an attempt is made to maintain a high zoom ratio, the entire zoom length becomes long, and it becomes difficult to achieve a reduction in size of the lens. Exceeding the lower limit of conditional expression (6) increases the magnification of aberration of the lens unit disposed on the object side of the R1 lens unit, and makes it difficult to correct the aberration. More preferably, conditional expression (6) should be set as follows.
-2.6 <βR <-2.0 (6a)

As a further embodiment of the present invention, the ratio between the focal length f1 of the first lens group and the focal length f2 of the second lens group is defined by conditional expression (7).
-10.00 <f1 / f2 <-2.50 (7)

Satisfying conditional expression (7) reduces the amount of movement of the second lens unit accompanying zooming while satisfactorily correcting axial chromatic aberration, and shortens the overall lens length while achieving high magnification. If the upper limit of conditional expression (7) is exceeded, the focal length of the second lens group becomes relatively short, which is advantageous for miniaturization, but aberration fluctuations accompanying zooming increase. If the lower limit of conditional expression (7) is exceeded, the focal length of the second lens group becomes relatively long, so the amount of movement of the second lens group due to zooming increases, the entire system becomes larger, and the size and weight are reduced. It becomes difficult. More preferably, conditional expression (7) should be set as follows.
−8.00 <f1 / f2 <−4.50 (7a)

  FIG. 2 shows longitudinal aberration diagrams at the (A) wide-angle end, (B) focal length 484.20 mm, and (C) telephoto end when the extender is retracted at an infinite object distance of Example 1. However, the value of the focal length is a value when a numerical example described later is expressed in mm. FIG. 3 shows longitudinal aberration diagrams at the (A) wide-angle end, (B) focal length 726.30 mm, and (C) telephoto end when the extender is inserted at infinite object distance according to the first embodiment. The aberration diagrams when retracting the extender are drawn on a scale of 0.5 mm for spherical aberration, 0.5 mm for astigmatism, 5% for distortion, and 0.05 mm for lateral chromatic aberration. The aberration diagrams when the extender is inserted are drawn on a scale of 1.00 mm for spherical aberration, 1.00 mm for astigmatism, 5% for distortion, and 0.100 mm for lateral chromatic aberration. Fno is the F number, and ω is the half angle of view. The wide-angle end and the telephoto end are zoom positions when the second lens unit U2 for zooming is positioned at both ends of a range in which the mechanism can move on the optical axis. These are all the same in the following embodiments.

  Example 1 is a zoom lens having a zoom ratio of 18.0 times, a half angle of view at the wide angle end of 18.2 degrees, a half angle of view of 1.05 degrees at the telephoto end, a maximum image height of 14.8 mm, and an extender magnification of 1.5 times. It is.

  Numerical data of Numerical Example 1 corresponding to Example 1 is shown in (Numerical Example 1) below. r is the radius of curvature of each surface from the object side, d is the spacing between the surfaces, and nd and νd are the refractive index and Abbe number of each optical member.

  The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, A4, A6, A8, A10, A12, A14 and A16 are assumed to be aspheric coefficients, respectively, and are expressed by the following equations.

又、例えば「ｅ−Ｚ」は「×１０^-Z」を意味する。＊印は非球面であることを示している。

For example, “e-Z” means “× 10 ^−Z ”. * Indicates an aspherical surface.

Table 1 shows corresponding values of the conditional expressions of Numerical Example 1.
Numerical Example 1 satisfies all of the conditional expressions (1) to (7), and achieves a high zoom ratio, a small size and a light weight, particularly an extender in a small size and a light weight while being a zoom lens for a large format camera. In addition, high optical performance is achieved in the entire zoom range from the wide-angle end to the telephoto end.

  FIG. 4 is a lens cross-sectional view of the zoom lens of Example 2 when focusing on an object at infinity at the wide-angle end and when the extender is retracted.

  In Example 2, the lens configuration of the second lens group U2, the third lens group U3, the R1 lens group UR1, and the R2 lens group UR2 is the same as that of Example 1. The first lens unit U1 is a positive lens that does not move for focusing, a cemented lens of positive and negative lenses, a cemented lens of positive, positive, and negative lenses that moves during focusing, and does not move for focusing. Consists of a positive lens and a negative lens. The extender lens group UEXT includes a positive lens, a cemented lens of a positive lens and a negative lens, a cemented lens of a positive lens and a negative lens, a cemented lens of a negative lens and a positive lens, and a negative lens.

  FIG. 5 shows longitudinal aberration diagrams at the (A) wide angle end, (B) focal length 575.00 mm, and (C) telephoto end when the extender is retracted at an infinite object distance of Example 2. FIG. 6 shows longitudinal aberration diagrams at the (A) wide angle end, (B) focal length 1035.00 mm, and (C) telephoto end when the extender is inserted at an infinite object distance according to the second embodiment.

Example 2 is a zoom lens having a zoom ratio of 19.4 times, a half angle of view of 16.5 degrees at the wide angle end, a half angle of view of 0.87 degrees at the telephoto end, a maximum image height of 14.8 mm, and an extender magnification of 1.8 times. It is.
Numerical data of Numerical Example 2 corresponding to Example 2 is shown in (Numerical Example 2) below.

Table 1 shows the corresponding values of the conditional expressions of Numerical Example 2.
Numerical Example 2 satisfies all of the conditional expressions (1) to (7), and realizes a high zoom ratio, a small size and a light weight, particularly an extender in a small size and a light weight while being a zoom lens for a large format camera. In addition, high optical performance is achieved in the entire zoom range from the wide-angle end to the telephoto end.

  FIG. 7 is a lens cross-sectional view of the zoom lens of Example 3 when focusing on an object at infinity at the wide-angle end and when the extender is retracted.

  In Example 3, the lens configurations of the first lens group U1, the second lens group U2, the third lens group U3, the R2 lens group UR2, and the EXT lens group UEXT are all the same as those in Example 1. The R1 lens unit UR1 includes a positive lens, a positive lens, an aperture stop SP, a cemented lens of a positive lens and a negative lens, a positive lens, and a cemented lens of a positive lens and a negative lens.

  FIG. 8 shows longitudinal aberration diagrams at the (A) wide-angle end, (B) focal length 484.20 mm, and (C) telephoto end when the extender is retracted at an infinite object distance of Example 3. FIG. 9 shows longitudinal aberration diagrams at the (A) wide angle end, (B) focal length 726.30 mm, and (C) telephoto end when the extender is inserted at an infinite object distance according to the third embodiment.

Example 3 is a zoom lens with a zoom ratio of 18.0 times, a half angle of view at the wide angle end of 18.2 degrees, a half angle of view of 1.05 degrees at the telephoto end, a maximum image height of 14.8 mm, and an extender magnification of 1.5 times. It is.
Numerical data of Numerical Example 3 corresponding to Example 3 is shown in (Numerical Example 3) below.

Table 1 shows the corresponding values of the conditional expressions of Numerical Example 3.
Numerical Example 3 satisfies all of the conditional expressions (1) to (7), and realizes a high zoom ratio, a small size and a light weight, particularly an extender in a small size and a light weight while being a zoom lens for a large format camera. In addition, high optical performance is achieved in the entire zoom range from the wide-angle end to the telephoto end.

  FIG. 10 is a lens cross-sectional view of the zoom lens of Example 4 when focusing on an object at infinity at the wide-angle end and when the extender is retracted.

  In Example 4, the lens configurations of the first lens group U1, the second lens group U2, the third lens group U3, the R2 lens group UR2, and the EXT lens group UEXT are all the same as in Example 1, but part of UR1 is It differs from the first to third embodiments in that it is movable during zooming. The R1 lens group UR1 is divided into two groups: an R1A lens group UR1A that moves during zooming, and an R1B lens group UR1B that does not move during zooming. The R1A lens group is composed of two positive lenses UR1A. The R1B lens group UR1B includes an aperture stop SP, a cemented lens of a positive lens and a negative lens, a positive lens, and a cemented lens of a positive lens and a negative lens.

  FIG. 11 shows longitudinal aberration diagrams at the (A) wide angle end, (B) focal length 482.09 mm, and (C) telephoto end when the extender is retracted at an infinite object distance of Example 4. FIG. 12 shows longitudinal aberration diagrams at the (A) wide angle end, (B) focal length 723.14 mm, and (C) telephoto end when the extender is inserted at infinite object distance in Example 4.

Example 4 is a zoom lens having a zoom ratio of 18.0 times, a half angle of view at the wide angle end of 18.2 degrees, a half angle of view of 1.05 degrees at the telephoto end, a maximum image height of 14.8 mm, and an extender magnification of 1.5 times. It is.
Numerical data of numerical example 4 corresponding to the fourth example is shown in (numerical example 4) below.

Table 1 shows corresponding values of the conditional expressions of Numerical Example 4.
Numerical Example 4 satisfies all of the conditional expressions (1) to (7), and realizes a high zoom ratio, a small size and a light weight, particularly an extender that is small and light, while being a zoom lens for a large format camera. In addition, high optical performance is achieved in the entire zoom range from the wide-angle end to the telephoto end.

  FIG. 13 is a lens cross-sectional view of the zoom lens of Example 5 when focusing on an object at infinity at the wide-angle end and when the extender is retracted.

  In Example 5, the lens configurations of the first lens group U1, the R1 lens group UR1, the R2 lens group UR2, and the EXT lens group UEXT are all the same as those in Example 1. In the zooming, in addition to the second lens group U2 and the third lens group U3, three groups including the fourth lens group U4 are driven, which is different from the first to fourth embodiments.

  The second lens unit U2 includes a negative lens and a cemented lens of a negative lens and a positive lens. The third lens unit U3 includes a negative lens and a positive lens. The fourth lens unit U4 includes a cemented lens of a negative lens and a positive lens.

  FIG. 14 shows longitudinal aberration diagrams at the (A) wide-angle end, (B) focal length 480.00 mm, and (C) telephoto end when the extender is retracted at an infinite object distance of Example 5. FIG. 15 shows longitudinal aberration diagrams at the (A) wide-angle end, (B) focal length 719.23 mm, and (C) telephoto end when the extender is inserted at infinite object distance in Example 5.

Example 5 is a zoom lens having a zoom ratio of 18.5 times, a half angle of view of 18.6 degrees at the wide angle end, a half angle of view of 1.04 degrees at the telephoto end, a maximum image height of 14.8 mm, and an extender magnification of 1.5 times. It is.
Numerical data of Numerical Example 5 corresponding to Example 5 is shown in (Numerical Example 5) below.

Table 1 shows corresponding values of the conditional expressions of Numerical Example 5.
Numerical Example 5 satisfies all the conditional expressions (1) to (7), and realizes a high zoom ratio, a small size and a light weight, particularly an extender in a small size and a light weight while being a zoom lens for a large format camera. In addition, high optical performance is achieved in the entire zoom range from the wide-angle end to the telephoto end.

(Imaging device)
FIG. 16 is a schematic diagram of a main part of an image pickup apparatus (television camera system) using the zoom lens according to any one of Embodiments 1 to 5 of the present invention as a photographing optical system. In FIG. 16, reference numeral 101 denotes a zoom lens according to any one of Examples 1 to 5. Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. Reference numeral 125 denotes an image pickup apparatus configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 includes a first lens group F, a zooming unit LZ, and an R lens group R for image formation. The first lens group F includes a lens group that moves during focusing.

  The zoom unit LZ includes at least two or more lens units that move during zooming. An R1 lens unit R1, an aperture stop SP, and an R2 lens unit R2 are disposed on the image side from the zooming unit LZ, and have a lens unit IE that can be inserted and removed from the optical path. By switching the lens unit IE, the focal length range of the entire zoom lens 101 is displaced. Reference numerals 114 and 115 denote drive mechanisms such as helicoids and cams for driving the first lens unit F and the variable magnification portion LZ in the optical axis direction. Reference numerals 116 to 118 denote motors (drive means) for electrically driving the drive mechanisms 114 and 115 and the aperture stop SP.

  Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the position of the first lens group F and the zooming portion LZ on the optical axis and the aperture diameter of the aperture stop SP. In the camera 124, 109 is a glass block corresponding to an optical filter or color separation optical system in the camera 124, and 110 is a solid-state imaging device (photoelectric conversion) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. Element). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens 101.

Thus, by applying the zoom lens of the present invention to a television camera, an imaging device having high optical performance is realized.
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

(Numerical example 1)
<When retracting extender>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 156.943 16.06 1.48749 70.2 124.20
2 -7723.214 1.00 122.81
3 163.335 3.40 1.72916 54.7 115.66
4 103.989 6.28 110.47
5 122.934 20.72 1.43387 95.1 109.95
6 -321.067 1.50 108.69
7 -263.298 3.20 1.72916 54.7 108.30
8 217.243 15.52 104.78
9 156.032 16.10 1.43387 95.1 104.06
10 -326.845 0.20 103.33
11 139.502 6.99 1.43387 95.1 96.83
12 228.876 (variable) 94.95
13 * -7969.421 1.20 1.77250 49.6 32.58
14 29.889 6.85 29.43
15 -111.689 1.00 1.61800 63.3 28.84
16 30.301 7.75 1.72047 34.7 28.43
17 -67.863 3.09 28.06
18 -33.691 1.00 1.61800 63.3 27.07
19 381.196 0.20 27.13
20 90.508 2.66 1.54814 45.8 27.46
21 8908.115 (variable) 27.76
22 -69.142 1.00 1.72916 54.7 38.17
23 168.092 3.44 1.84666 23.8 39.92
24 -968.105 (variable) 40.57
25 124.414 6.23 1.59349 67.0 42.31
26 * -90.292 1.00 42.73
27 47.974 8.90 1.61800 63.3 43.48
28 -142.425 9.03 42.80
29 (Aperture) ∞ 2.00 34.50
30 149.282 7.23 1.43875 94.9 32.26
31 -33.347 1.20 2.00330 28.3 30.70
32 550.266 7.00 30.26
33 95.056 6.82 1.56732 42.8 29.35
34 -41.261 8.41 28.78
35 -59.813 1.20 2.00100 29.1 20.35
36 16.226 6.85 1.84666 23.8 19.31
37 137.335 40.00 18.93
38 54.392 6.91 1.48749 70.2 29.06
39 -37.581 3.00 29.08
40 -131.675 1.00 1.83481 42.7 26.88
41 51.853 5.11 1.72825 28.5 26.44
42 -63.455 2.32 26.23
43 -31.243 1.00 1.88300 40.8 25.76
44 604.843 4.42 1.64769 33.8 26.43
45 -62.626 52.00 27.00
Image plane ∞

Aspherical data 13th surface
K = 2.16213e + 005 A 4 = 2.41572e-006 A 6 = 1.80376e-010 A 8 = -2.94520e-012 A10 = -7.62036e-014 A12 = 7.98769e-016 A14 = -2.83869e-018 A16 = 3.65020e-021

26th page
K = -3.17969e-001 A 4 = 7.05385e-007 A 6 = 3.09137e-010 A 8 = -1.06097e-012 A10 = 3.24166e-015 A12 = -2.22180e-018 A14 = -4.33681e-021 A16 = 6.21800e-024

Various data Zoom ratio 18.00
Wide angle Medium Telephoto focal length 45.00 484.20 810.00
F number 4.50 4.50 6.91
Angle of View 18.21 1.75 1.05
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 52.00 52.00 52.00

d12 10.00 125.38 134.86
d21 138.23 5.71 10.13
d24 1.00 18.14 4.24

Entrance pupil position 161.96 1489.05 2289.81
Exit pupil position -120.99 -120.99 -120.99
Front principal point position 195.25 617.99 -692.85
Rear principal point position 7.00 -432.20 -758.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 216.70 90.96 36.26 -40.64
2 13 -30.00 23.75 3.25 -13.81
3 22 -111.70 4.44 -0.29 -2.73
4 25 35.34 65.87 -34.11 -42.33
5 38 108.91 23.75 -8.06 -23.32

<When the extender is inserted>
Unit mm

Surface data surface number rd nd vd Effective diameter
37 137.335 5.00 18.93
IE38 20.302 3.42 1.43875 94.9 18.50
IE39 49.182 5.00 17.81
IE40 229.622 0.80 2.00100 29.1 16.36
IE41 19.366 4.51 1.67300 38.1 15.88
IE42 -84.222 4.49 15.72
IE43 439.262 0.80 1.59522 67.7 15.85
IE44 13.392 6.58 1.63980 34.5 15.88
IE45 -38.945 3.60 15.77
IE46 -26.363 0.80 1.77250 49.6 14.65
IE47 56.797 5.00 14.81
48 54.392 6.91 1.48749 70.2 29.06
49 -37.581 3.00 29.08
50 -131.675 1.00 1.83481 42.7 26.88
51 51.853 5.11 1.72825 28.5 26.44
52 -63.455 2.32 26.23
53 -31.243 1.00 1.88300 40.8 25.76
54 604.843 4.42 1.64769 33.8 26.43
55 -62.626 52.00 27.00
Image plane ∞


Various data Zoom ratio 18.00
Wide angle Medium telephoto focal length 67.50 726.30 1215.00
F number 6.75 6.75 10.37
Angle of View 12.37 1.17 0.70
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 52.00 52.00 52.00


Entrance pupil position 161.96 1489.05 2289.81
Exit pupil position -48.44 -48.44 -48.44
Front principal point position 184.10 -3036.46 -11192.22
Rear principal point position -15.50 -674.30 -1163.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 216.70 90.96 36.26 -40.64
2 13 -30.00 23.75 3.25 -13.81
3 22 -111.70 4.44 -0.29 -2.73
4 25 35.34 65.87 -34.11 -42.33
5 38 -292.96 30.00 173.53 94.70
6 48 108.91 23.75 -8.06 -23.32

(Numerical example 2)
<When retracting extender>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 429.871 10.91 1.48749 70.2 126.34
2 -617.412 0.20 125.51
3 174.106 19.54 1.43875 94.9 118.28
4 -310.406 4.00 1.72047 34.7 116.27
5 826.022 17.40 113.43
6 417.769 8.72 1.43387 95.1 108.37
7 -868.155 0.20 106.56
8 182.863 10.27 1.43875 94.9 101.49
9 -15342.219 2.50 1.74950 35.3 99.91
10 719.803 3.00 98.09
11 1264.541 9.83 1.85478 24.8 96.59
12 -218.233 2.20 1.74950 35.3 95.20
13 303.152 (variable) 90.46
14 * 246.786 1.20 1.77250 49.6 34.19
15 30.480 6.47 30.97
16 -127.625 1.00 1.59522 67.7 30.54
17 35.867 6.76 1.72047 34.7 29.97
18 -144.731 2.72 29.52
19 -38.152 1.00 1.59522 67.7 29.27
20 165.346 0.20 29.48
21 91.722 2.81 1.72047 34.7 29.62
22 -993.437 (variable) 29.57
23 -71.785 1.00 1.72916 54.7 35.49
24 121.958 2.95 1.85478 24.8 37.01
25 -25895.241 (variable) 37.44
26 126.975 6.22 1.60311 60.6 43.45
27 * -98.810 1.00 43.83
28 55.119 9.10 1.48749 70.2 44.27
29 -114.346 3.00 43.69
30 (Aperture) ∞ 4.00 40.67
31 69.738 8.39 1.43875 94.9 36.85
32 -45.372 1.20 1.88300 40.8 35.53
33 63.388 0.24 34.10
34 34.273 8.85 1.58913 61.1 34.39
35 -120.734 5.00 33.32
36 195.662 1.20 2.00 100 29.1 28.15
37 16.949 6.28 1.80518 25.4 25.32
38 50.791 40.00 24.73
39 42.151 7.50 1.51633 64.1 30.82
40 -58.123 11.18 30.42
41 -39.106 1.00 1.88300 40.8 24.17
42 21.042 10.31 1.72825 28.5 24.41
43 -30.589 2.14 25.05
44 -20.311 1.00 1.95375 32.3 24.82
45 -162.986 11.03 1.51742 52.4 27.36
46 -20.691 52.45 30.57
Image plane ∞

Aspheric data 14th surface
K = -7.58303e + 000 A 4 = 1.12888e-006 A 6 = 6.90844e-010 A 8 = -1.78006e-011 A10 = 1.69108e-013 A12 = -8.74521e-016 A14 = 2.30851e-018 A16 = -2.41264e-021

27th page
K = -1.96840e + 000 A 4 = 3.57012e-007 A 6 = -2.32291e-011 A 8 = 4.17159e-014

Various data Zoom ratio 19.40
Wide angle Medium Telephoto focal length 50.00 575.00 970.00
F number 4.50 4.74 8.00
Angle of View 16.49 1.47 0.87
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 52.45 52.45 52.45

d13 4.00 120.64 129.64
d22 130.67 2.65 12.39
d25 9.36 20.74 2.00

Entrance pupil position 162.15 1642.31 2466.48
Exit pupil position -141.77 -141.77 -141.77
Front principal point position 199.27 514.93 -1408.17
Rear principal point position 2.45 -522.55 -917.55

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 230.00 88.77 4.69 -58.71
2 14 -32.50 22.16 3.59 -12.40
3 23 -110.00 3.95 -0.08 -2.24
4 26 45.99 54.49 -25.25 -38.94
5 39 166.16 44.16 7.50 -36.46

<When the extender is inserted>
Unit mm

Surface data surface number rd nd vd Effective diameter
38 50.791 4.00 24.73
IE39 18.129 6.35 1.43875 94.9 24.03
IE40 182.852 7.80 22.82
IE41 90.785 2.20 1.69895 30.1 16.71
IE42 -56.422 0.80 2.00100 29.1 16.06
IE43 24.759 1.00 15.07
IE44 38.449 4.35 1.59270 35.3 14.99
IE45 -17.509 0.80 2.00100 29.1 14.50
IE46 -28.048 1.00 14.51
IE47 -34.833 0.80 1.59522 67.7 13.78
IE48 9.904 6.59 1.62588 35.7 13.04
IE49 -19.808 1.00 12.36
IE50 -14.822 0.80 1.81600 46.6 11.64
IE51 -617.226 2.50 11.60
52 42.151 7.50 1.51633 64.1 30.82
53 -58.123 11.18 30.42
54 -39.106 1.00 1.88300 40.8 24.17
55 21.042 10.31 1.72825 28.5 24.41
56 -30.589 2.14 25.05
57 -20.311 1.00 1.95375 32.3 24.82
58 -162.986 11.03 1.51742 52.4 27.36
59 -20.691 52.45 30.57
Image plane ∞

Various data Zoom ratio 19.40
Wide angle Medium Telephoto focal length 90.00 1035.00 1746.00
F number 8.10 8.54 14.40
Angle of View 9.34 0.82 0.49
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 52.45 52.45 52.45


Entrance pupil position 162.15 1642.31 2466.48
Exit pupil position -72.39 -72.39 -72.39
Front principal point position 187.26 -5903.61 -20207.28
Rear principal point position -37.55 -982.55 -1693.55

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 230.00 88.77 4.69 -58.71
2 14 -32.50 22.16 3.59 -12.40
3 23 -110.00 3.95 -0.08 -2.24
4 26 45.99 54.49 -25.25 -38.94
5 39 -167.20 33.50 160.40 67.45
6 52 166.16 44.16 7.50 -36.46

(Numerical Example 3)
<When retracting extender>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 140.316 16.95 1.48749 70.2 122.94
2 1669.174 1.00 121.58
3 165.445 3.40 1.72916 54.7 116.41
4 103.648 7.66 111.04
5 134.785 20.83 1.43387 95.1 110.51
6 -258.064 1.94 109.34
7 -230.599 3.20 1.72916 54.7 108.26
8 257.163 17.33 105.17
9 174.177 15.72 1.43387 95.1 104.16
10 -321.193 0.20 103.37
11 155.960 6.99 1.43387 95.1 97.52
12 312.231 (variable) 95.99
13 * -2514.893 1.20 1.77250 49.6 33.28
14 30.849 7.04 30.19
15 -104.691 1.00 1.61800 63.3 29.70
16 34.356 7.62 1.72047 34.7 29.50
17 -69.194 2.80 29.25
18 -38.820 1.00 1.61800 63.3 28.42
19 210.008 0.20 28.49
20 78.653 2.95 1.54814 45.8 28.60
21 -2804.249 (variable) 28.50
22 -74.249 1.00 1.72916 54.7 37.09
23 159.135 3.33 1.84666 23.8 38.57
24 -1624.029 (variable) 39.16
25 228.538 5.69 1.59349 67.0 40.94
26 * -75.363 1.00 41.44
27 41.857 9.94 1.61800 63.3 42.42
28 -192.664 12.00 41.27
29 (Aperture) ∞ 2.00 30.84
30 119.418 6.96 1.43875 94.9 28.57
31 -28.098 1.20 2.00330 28.3 26.93
32 362.697 5.34 26.56
33 73.276 8.32 1.51742 52.4 26.05
34 -33.315 5.81 25.23
35 84.087 7.00 1.80809 22.8 18.17
36 -17.704 1.50 2.00100 29.1 15.70
37 22.123 31.00 14.10
38 99.637 7.26 1.48749 70.2 27.37
39 -26.927 1.00 27.86
40 -77.260 1.00 1.83481 42.7 26.74
41 49.946 5.72 1.72825 28.5 26.74
42 -48.611 3.09 26.81
43 -23.621 1.00 1.91082 35.3 26.46
44 -137.257 7.11 1.64769 33.8 28.37
45 -27.641 44.00 30.02
Image plane ∞

Aspherical data 13th surface
K = 2.04193e + 004 A 4 = 1.81875e-006 A 6 = 6.58814e-010 A 8 = -5.04808e-012 A10 = -4.27883e-014 A12 = 6.70690e-016 A14 = -2.80293e-018 A16 = 4.06863e-021

26th page
K = -1.36919e + 000 A 4 = 3.61976e-007 A 6 = 2.82584e-010 A 8 = -1.25962e-012 A10 = 3.98178e-015 A12 = -8.07183e-019 A14 = -1.35342e-020 A16 = 1.69753e-023

Various data Zoom ratio 18.00
Wide angle Medium Telephoto focal length 45.00 484.20 810.00
F number 4.50 4.50 6.88
Angle of View 18.21 1.75 1.05
Image height 14.80 14.80 14.80
Total lens length 440.00 440.00 440.00
BF 44.00 44.00 44.00

d12 6.44 125.77 135.44
d21 139.92 5.29 11.78
d24 2.35 17.66 1.50

Entrance pupil position 161.90 1505.77 2352.66
Exit pupil position -227.97 -227.97 -227.97
Front principal point position 199.46 1127.93 750.27
Rear principal point position -1.00 -440.20 -766.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 218.91 95.22 41.47 -41.01
2 13 -32.49 23.80 2.54 -14.89
3 22 -116.96 4.33 -0.20 -2.57
4 25 28.70 66.77 -45.98 -34.76
5 38 72.80 26.17 10.46 -9.29

<When the extender is inserted>
Unit mm

Surface data surface number rd nd vd Effective diameter
37 22.102 3.00 14.10
IE38 12.867 2.62 1.43875 94.9 13.91
IE39 28.004 2.44 13.34
IE40 69.954 0.80 1.72916 54.7 12.63
IE41 9.773 4.90 1.48749 70.2 11.89
IE42 -37.602 5.83 11.64
IE43 -21.446 0.80 1.49700 81.5 11.09
IE44 14.320 4.93 1.58144 40.8 11.78
IE45 -15.449 1.51 12.21
IE46 -16.489 0.80 1.72916 54.7 11.84
IE47 78.647 3.36 12.26
48 99.637 7.26 1.48749 70.2 27.37
49 -26.927 1.00 27.86
50 -77.260 1.00 1.83481 42.7 26.74
51 49.946 5.72 1.72825 28.5 26.74
52 -48.611 3.09 26.81
53 -23.621 1.00 1.91082 35.3 26.46
54 -137.257 7.11 1.64769 33.8 28.37
55 -27.641 44.00 30.02
Image plane ∞

Various data Zoom ratio 18.00
Wide angle Medium telephoto focal length 67.50 726.30 1215.00
F number 6.75 6.75 10.32
Angle of View 12.37 1.17 0.70
Image height 14.80 14.80 14.80
Total lens length 440.00 440.00 440.00
BF 44.00 44.00 44.00

d12 6.44 125.77 135.44
d21 139.92 5.29 11.78
d24 2.35 17.66 1.50

Entrance pupil position 161.90 1505.77 2352.66
Exit pupil position -69.12 -69.12 -69.12
Front principal point position 189.12 -2431.17 -9482.28
Rear principal point position -23.50 -682.30 -1171.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 218.91 95.22 41.47 -41.01
2 13 -32.49 23.80 2.54 -14.89
3 22 -116.96 4.33 -0.20 -2.57
4 25 28.69 66.77 -46.02 -34.75
5 38 -264.88 24.64 153.38 84.35
6 48 72.80 26.17 10.46 -9.29

(Numerical example 4)
<When retracting extender>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 137.692 15.77 1.48749 70.2 116.46
2 11176.442 1.00 115.45
3 155.410 3.40 1.72916 54.7 109.94
4 97.082 6.11 104.93
5 114.026 19.15 1.43387 95.1 104.59
6 -398.091 1.50 103.45
7 -290.048 3.20 1.72916 54.7 103.29
8 194.386 16.10 100.24
9 160.018 15.42 1.43387 95.1 100.63
10 -334.258 0.20 99.97
11 143.542 6.69 1.43387 95.1 95.07
12 258.535 (variable) 93.66
13 * -74434.209 1.20 1.77250 49.6 32.93
14 29.645 5.59 29.81
15 -195.795 1.00 1.61800 63.3 29.58
16 32.631 6.90 1.73800 32.3 29.19
17 -140.681 3.61 28.80
18 -37.772 1.00 1.59522 67.7 28.12
19 606.760 0.20 28.34
20 105.203 3.13 1.51742 52.4 28.46
21 -180.867 (variable) 28.45
22 -71.520 1.00 1.69680 55.5 36.46
23 150.080 3.26 1.84666 23.8 37.96
24 -8857.141 (variable) 38.52
25 212.199 5.52 1.59349 67.0 41.28
26 * -79.926 1.00 41.78
27 43.946 9.78 1.59522 67.7 43.12
28 -110.217 (variable) 42.46
29 (Aperture) ∞ 2.77 34.27
30 -490.595 5.12 1.43875 94.9 32.21
31 -42.372 1.20 2.00330 28.3 30.92
32 137.949 6.04 30.30
33 1789.327 4.55 1.56732 42.8 30.16
34 -46.939 16.76 30.11
35 -592.755 6.98 1.84666 23.8 21.49
36 -20.295 1.00 2.00 100 29.1 20.55
37 128.528 40.00 20.09
38 57.880 6.49 1.48749 70.2 29.71
39 -44.479 3.00 29.71
40 -280.422 1.20 1.83481 42.7 27.83
41 148.279 3.57 1.72825 28.5 27.51
42 -102.425 4.48 27.22
43 -35.798 1.20 1.88300 40.8 25.84
44 71.908 6.50 1.62004 36.3 26.48
45 -55.722 53.89 27.26
Image plane ∞

Aspherical data 13th surface
K = 1.98460e + 007 A 4 = 1.97993e-006 A 6 = 9.85625e-011 A 8 = 2.46937e-013 A10 = -8.92775e-014 A12 = 7.32430e-016 A14 = -2.37718e-018 A16 = 2.84765 e-021

26th page
K = -1.46160e + 000 A 4 = 8.55710e-007 A 6 = 6.56336e-010 A 8 = -1.00583e-012 A10 = 3.83979e-015 A12 = -1.98113e-018 A14 = -6.69496e-021 A16 = 9.28272e-024

Various data Zoom ratio 18.00
Wide angle Medium Telephoto focal length 45.00 482.09 810.00
F number 4.50 4.50 7.00
Angle of View 18.21 1.76 1.05
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 53.89 53.89 53.89

d12 4.00 123.01 132.80
d21 137.84 4.44 11.23
d24 4.04 18.22 1.50
d28 7.65 7.86 8.00

Entrance pupil position 150.12 1391.92 2120.10
Exit pupil position -129.42 -129.42 -129.42
Front principal point position 184.08 606.10 -649.21
Rear principal point position 8.89 -428.21 -756.11

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 216.70 88.54 34.46 -41.26
2 13 -33.02 22.63 2.30 -14.44
3 22 -115.67 4.26 -0.10 -2.44
4 25 35.66 16.30 5.01 -5.84
5 29 -33.65 44.41 18.15 -12.21
6 38 115.70 26.44 -9.80 -27.44

<When the extender is inserted>
Unit mm

Surface data surface number rd nd vd Effective diameter
37 128.528 4.66 20.09
IE38 22.151 3.42 1.43875 94.9 19.70
IE39 53.717 4.72 19.04
IE40 -775.637 0.80 2.00100 29.1 17.80
IE41 21.696 4.67 1.80440 39.6 17.41
IE42 -86.841 5.00 17.24
IE43 192.674 0.80 1.59522 67.7 15.60
IE44 12.188 6.42 1.59270 35.3 14.92
IE45 -41.238 3.71 14.23
IE46 -28.580 0.80 1.77250 49.6 12.10
IE47 56.797 5.00 11.89
48 57.880 6.49 1.48749 70.2 29.71
49 -44.479 3.00 29.71
50 -280.422 1.20 1.83481 42.7 27.83
51 148.279 3.57 1.72825 28.5 27.51
52 -102.425 4.48 27.22
53 -35.798 1.20 1.88300 40.8 25.84
54 71.908 6.50 1.62004 36.3 26.48
55 -55.722 53.89 27.26
Image plane ∞

Various data Zoom ratio 18.00
Wide angle Medium telephoto focal length 67.50 723.14 1215.00
F number 6.75 6.75 10.50
Angle of View 12.37 1.17 0.70
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 53.89 53.89 53.89

d12 4.00 123.01 132.80
d21 137.84 4.44 11.23
d24 4.04 18.22 1.50
d28 7.65 7.86 8.00

Entrance pupil position 150.12 1391.92 2120.10
Exit pupil position -52.23 -52.23 -52.23
Front principal point position 174.69 -2812.89 -10576.52
Rear principal point position -13.61 -669.25 -1161.11

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 216.70 88.54 34.46 -41.26
2 13 -33.02 22.63 2.30 -14.44
3 22 -115.67 4.26 -0.10 -2.44
4 25 35.66 16.30 5.01 -5.84
5 29 -33.65 44.41 18.15 -12.21
6 38 -326.12 30.34 190.59 105.89
7 48 115.70 26.44 -9.80 -27.44

(Numerical example 5)
<When retracting extender>
Unit mm

Surface data surface number rd nd vd
1 152.099 17.20 1.48749 70.2
2 -23344.659 1.00
3 151.436 3.40 1.72916 54.7
4 103.587 7.15
5 128.457 20.46 1.43387 95.1
6 -342.625 1.50
7 -269.216 3.20 1.72916 54.7
8 205.789 15.77
9 157.093 16.47 1.43387 95.1
10 -322.888 0.20
11 150.950 6.53 1.43387 95.1
12 259.875 (variable)
13 * -190.766 1.20 2.00100 29.1
14 38.369 5.87
15 -143.495 1.00 1.59522 67.7
16 38.531 8.13 1.80000 29.8
17 -59.406 (variable)
18 -39.596 1.00 1.59522 67.7
19 149.891 0.20
20 71.494 2.28 1.80809 22.8
21 128.832 (variable)
22 -67.735 1.00 1.72916 54.7
23 139.424 3.50 1.84666 23.8
24 -1332.081 (variable)
25 190.705 6.54 1.59349 67.0
26 * -67.697 1.00
27 47.325 8.32 1.61800 63.3
28 -207.805 9.28
29 (Aperture) ∞ 2.29
30 208.522 6.42 1.43875 94.9
31 -38.067 1.20 2.00330 28.3
32 108.280 0.20
33 37.217 8.75 1.56732 42.8
34 -65.490 7.03
35 -15581.828 1.20 2.00100 29.1
36 14.527 6.99 1.84666 23.8
37 43.246 40.00
38 42.466 6.60 1.48749 70.2
39 -39.920 3.00
40 -130.543 1.00 1.83481 42.7
41 38.614 5.03 1.72825 28.5
42 -73.155 2.37
43 -29.818 1.00 1.88300 40.8
44 163.293 4.76 1.64769 33.8
45 -54.853 52.00
Image plane ∞

Aspherical data 13th surface
K = 6.31849e + 001 A 4 = 2.87839e-006 A 6 = 1.56495e-009 A 8 = -1.03333e-011 A10 = 5.39280e-014 A12 = -8.23293e-017 A14 = -6.58690e-020 A16 = 2.75624e-022

26th page
K = -1.80551e-001 A 4 = 5.58008e-007 A 6 = 2.64789e-010 A 8 = -1.39744e-012 A10 = 4.71189e-015 A12 = -6.90531e-018 A14 = 2.89543e-021 A16 = 1.54147e-024

Various data Zoom ratio 18.48
Wide angle Medium Telephoto focal length
F number 4.50 4.50 6.76
Angle of View 18.57 1.77 1.04
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 52.00 52.00 52.00

d12 7.00 122.55 132.32
d17 3.12 10.13 8.75
d21 142.84 5.00 11.89
d24 5.00 20.29 5.00

Zoom lens group data group Start surface Focal length
1 1 216.97
2 13 -85.00
3 18 -71.34
4 22 -107.90
5 25 37.06
6 38 117.26

<When the extender is inserted>
Unit mm

Surface data surface number rd nd vd
37 43.246 5.00
IE38 20.478 3.62 1.43875 94.9
IE39 51.712 5.00
IE40 -218.360 0.80 2.00100 29.1
IE41 26.211 4.59 1.67300 38.1
IE42 -51.006 5.00
IE43 109.812 0.80 1.59349 67.0
IE44 11.622 7.11 1.62588 35.7
IE45 -33.633 2.28
IE46 -22.506 0.80 1.81600 46.6
IE47 56.797 5.00
48 42.466 6.60 1.48749 70.2
49 -39.920 3.00
50 -130.543 1.00 1.83481 42.7
51 38.614 5.03 1.72825 28.5
52 -73.155 2.37
53 -29.818 1.00 1.88300 40.8
54 163.293 4.76 1.64769 33.8
55 -54.853 52.00
Image plane ∞

Aspherical data 13th surface
K = 6.31849e + 001 A 4 = 2.87839e-006 A 6 = 1.56495e-009 A 8 = -1.03333e-011 A10 = 5.39280e-014 A12 = -8.23293e-017 A14 = -6.58690e-020 A16 = 2.75624e-022

26th page
K = -1.80551e-001 A 4 = 5.58008e-007 A 6 = 2.64789e-010 A 8 = -1.39744e-012 A10 = 4.71189e-015 A12 = -6.90531e-018 A14 = 2.89543e-021 A16 = 1.54147e-024

Various data Zoom ratio 18.48
Wide angle Medium telephoto focal length 66.00
F number 6.75 6.75 10.13
Angle of View 12.64 1.18 0.70
Image height 14.80 14.80 14.80
Total lens length 450.00 450.00 450.00
BF 52.00 52.00 52.00

d12 7.00 122.55 132.32
d17 3.12 10.13 8.75
d21 142.84 5.00 11.89
d24 5.00 20.29 5.00

Zoom lens group data group Start surface Focal length
1 1 216.97
2 13 -85.00
3 18 -71.34
4 22 -107.90
5 25 37.06
6 38 -282.18
7 48 117.26

U1: First lens group U2: Second lens group U3: Third lens group U4: Fourth lens group UR1: R1 lens group UR2: R2 lens group SP: Aperture stop UR1A: R1A lens group UR1B: R1B lens group

Claims (13)

A first lens unit having positive refractive power that does not move for zooming in order from the object side to the image side;
A second lens group having a negative refractive power that moves during zooming;
One or more lens groups that move during zooming;
An R1 lens group including an aperture stop and having positive refractive power;
An EXT lens group that can be inserted into and removed from the optical path;
An R2 lens group that does not move for zooming;
Consisting of
The R1 lens group includes a lens having the largest effective diameter between the image side lens group and the EXT lens group than the second lens group,
When focusing on infinity and the maximum ray height of the on-axis ray at the R1 lens group at the wide-angle end is hR1, and when infinity is in focus and the maximum ray height hEXT at the EXT lens group at the wide-angle end ,
1.50 <hR1 / hEXT <3.50
And the axial light beam incident on the R1 lens group is a divergent light beam.
Here, the maximum light ray height in a lens group refers to the largest value among the light ray heights on the lens surfaces of light rays passing through a plurality of lens surfaces included in the lens group. When the focal length of the R1 lens group is fR1, and the combined focal length of the R1 lens group and the R2 lens group when the EXT lens group is retracted is fR,
0.25 <fR1 / fR <0.90
The zoom lens according to claim 1, wherein: When the focal length of the R1 lens group is fR1, and the focal length of the R2 lens group is fR2,
0.20 <fR1 / fR2 <0.50
The zoom lens according to claim 1, wherein:   The zoom lens according to any one of claims 1 to 3, wherein the R1 lens group includes at least one cemented lens of a lens having a positive refractive power and a lens having a negative refractive power.   5. The zoom lens according to claim 1, wherein the EXT lens group includes at least one cemented lens of a lens having a positive refractive power and a lens having a negative refractive power. When the diameter of the image circle when the EXT lens group is retracted is φ, and the largest effective diameter in the EXT lens group is D,
0.20 <D / φ <1.20
The zoom lens according to claim 1, wherein:
However, when the focal length at the time of retracting the extender and at the wide-angle end and focusing at infinity is fw and the half angle of view is ω, the diameter φ of the image circle is obtained by the following equation.
φ = 2 × fw × tan ω When focusing on infinity and at the wide-angle end, the distance from the most object side surface of the R1 lens group to the most image side surface is LR1, and the distance from the most object side surface of the first lens group to the image surface is Ltotal. And when
0.10 <LR1 / Ltotal <0.30
The zoom lens according to claim 1, wherein the zoom lens is a zoom lens.   The zoom lens according to claim 1, wherein the first R1 lens group has an aspheric surface on at least one surface. When the combined lateral magnification at the wide-angle end and βR is in focus at infinity of the R1 lens group and the R2 lens group when the EXT lens group is retracted,
−3.0 <βR <−1.8
The zoom lens according to claim 1, wherein the zoom lens is a zoom lens. When the focal length of the first lens group is f1, and the focal length of the second lens group is f2,
-10.0 <f1 / f2 <-2.5
The zoom lens according to claim 1, wherein the zoom lens is a zoom lens.   The zoom lens according to claim 1, wherein focusing is performed by a lens group closer to the object side than the aperture stop. At least some of the R1 lens groups move during zooming;
The zoom lens according to any one of claims 1 to 11, wherein:   An imaging apparatus comprising: the zoom lens according to claim 1; and a solid-state imaging device that receives an image formed by the zoom lens.

Images