JP2020085935A - Zoom lens and imaging apparatus - Google Patents

Abstract

To provide a zoom lens which is advantageous in terms of temperature stability of focus, and correction of on-axis chromatic aberration and chromatic aberration of magnification over an entire zoom range, for example.SOLUTION: The zoom lens of the present invention is comprised of, in order from an object side to an image side, a positive first lens group configured to be stationary when zooming, a front movable lens group comprised of one or two negative sub-lens groups configured to move for zooming, a rear movable lens group comprised of two sub-lens groups configured to move for zooming, and a final lens group configured to be stationary when zooming, the final lens group is comprised of, in order from the object side to the image side, a negative lens group with negative refractive power and including a negative lens An, and a positive lens group with positive refractive power and including a positive lens Bp. A lateral magnification of the final lens group, a temperature coefficient of a refractive index and Abbe number of the negative lens An, and a partial dispersion ratio and Abbe number of the positive lens Bp are each set appropriately.SELECTED DRAWING: Figure 1

Description

The present invention relates to a zoom lens and an imaging device.

In recent years, zoom lenses having a wide angle of view, a high zoom ratio, and high optical performance have been demanded for image pickup apparatuses such as television cameras, movie cameras, and photographic cameras. In particular, an image pickup device such as a CCD or a CMOS used in a television or a movie camera as a professional moving image shooting system has a substantially uniform resolution over the entire image pickup range. Therefore, a zoom lens using this is required to have a substantially uniform resolution from the center of the screen to the periphery of the screen, and to have little chromatic aberration.

As a zoom lens having a wide angle of view and a high zoom ratio, a positive lead type five-group zoom lens including five lens groups in which a lens group having a positive refractive power is arranged closest to the object is known. For example, Patent Document 1 discloses a zoom lens having a zoom ratio of about 106 and a half angle of view of about 34.5° at the wide-angle end. Patent Document 2 discloses a zoom lens having a zoom ratio of about 110 and a half angle of view of about 32.0° at the wide-angle end.

In addition, in recent years, the definition of cameras has become higher and higher-performance lenses have been demanded, and the depth of focus has become shallower. Therefore, it is necessary to correct the focus shift when the environmental temperature changes with higher accuracy than before. In particular, in a television camera lens in which focusing is performed by the first lens group, it is important to correct the focus shift on the wide angle side where the focus change due to focusing is small.

International Publication No. 2014-73186 JP, 2014-38238, A

In the positive lead type 5-group zoom lens described above, an optical material having low dispersion and high anomalous dispersion is used for the third lens group and the fourth lens group in order to reduce changes in chromatic aberration in the entire zoom range. There is. Since the temperature coefficient of the refractive index of these materials is a negative value as shown in Table 1, it causes a focus shift when the environmental temperature changes.

In order to suppress focus shift when the ambient temperature changes on the wide-angle side, select a material with a positive temperature coefficient of refractive index for the positive lens of the final lens group that is fixed during zooming, and select a material with a negative refractive index for the negative lens. It is necessary to select a material with a negative temperature coefficient. On the other hand, the material selection becomes important in order to satisfactorily correct the axial chromatic aberration and the magnification aberration.

Therefore, an object of the present invention is to provide a zoom lens that is advantageous in terms of, for example, temperature stability of focus and correction of axial chromatic aberration and lateral chromatic aberration over the entire zoom range.

To achieve the above object, the zoom lens of the present invention comprises, in order from the object side to the image side, a positive first lens group that does not move for zooming, and one or two lenses that move for zooming. A front lens group consisting of two negative sub-lens groups, a rear lens group consisting of two sub-lens groups that move for zooming, and a final lens group that does not move for zooming. And the final lens group comprises, in order from the object side to the image side, a negative lens group having a negative refractive power including a negative lens An and a positive lens group having a positive refractive power including a positive lens Bp, The lateral magnification of the final lens group is βL, the temperature coefficient of the refractive index of the negative lens An and the Abbe number are dNdTAn and νdAn, respectively, and the partial dispersion ratio and the Abbe number of the positive lens Bp are θgFBp and νdBp, respectively. Formula 0.8≦β≦3.0
−3.0≦dn/dTAn≦4.2
30.0≦νdAn≦70.2
0.01≦0.00162×ν dBp−0.6414+θgFBp≦0.05
The temperature coefficient of the refractive index is the temperature coefficient of the relative refractive index in air at 20° C. to 40° C., and the Abbe number ν and the partial dispersion ratio θ are Let ν=(Nd-1)/(NF-NC) and θ=(Ng-NF), where Ng, NF, Nd, and NC are the refractive indices for g-line, F-line, d-line, and C-line, respectively. / (NF-NC)
It is represented by.

According to the present invention, it is possible to provide a zoom lens that is advantageous in terms of, for example, temperature stability of focus and correction of axial chromatic aberration and lateral chromatic aberration over the entire zoom range.

FIG. 6 is a lens cross-sectional view of Numerical Embodiment 1 at the wide-angle end when focused on infinity. FIG. 9 is a longitudinal aberration diagram at the wide-angle end (a) when focused on infinity, f=118.64 mm (b), the telephoto end (c), and the wide-angle end (d) when the extender is inserted in Numerical Example 1. FIG. 7 is a lateral aberration diagram when the vibration-proof lens group is shifted with respect to the optical axis by 0.7 mm at the telephoto end (a) and the telephoto end (b) when focusing on infinity in Numerical Example 1. FIG. 6 is a lens cross-sectional view of Numerical Example 2 at the wide-angle end when focused on infinity. FIG. 10 is a longitudinal aberration diagram at the wide-angle end (a), f=70.52 mm (b), and the telephoto end (c) when focused on infinity in Numerical Example 2. FIG. 9 is a lens cross-sectional view of Numerical Example 3 at the wide-angle end when focused on infinity. FIG. 11 is a longitudinal aberration diagram at the wide-angle end (a), f=99.40 mm (b), and the telephoto end (c) when focused on infinity in Numerical Example 3. 16 is a lens cross-sectional view of Numerical Example 4 at the wide-angle end when focused on infinity. FIG. 11 is a longitudinal aberration diagram at the wide-angle end (a), f=66.57 mm (b), and the telephoto end (c) when focused on infinity in Numerical Example 4. FIG. 16 is a lens cross-sectional view of Numerical Example 5 at the wide-angle end when focused on infinity. FIG. 16 is a longitudinal aberration diagram at the wide-angle end (a), f=118.64 mm (b), and the telephoto end (c) when focused on infinity in Numerical Example 5. FIG. 16 is a lens cross-sectional view of Numerical Example 6 at the wide-angle end when focused on infinity. FIG. 16 is a longitudinal aberration diagram at the wide-angle end (a), f=100.00 mm (b), and the telephoto end (c) when focused on infinity in Numerical Example 6. FIG. 3 is a schematic view of a main part of the image pickup apparatus of the present invention. FIG. 6 is an optical path diagram on-axis and off-axis (ω=30.2°) in the fifth lens unit L5 at the wide-angle end of the zoom lens of Numerical Example 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The zoom lens of the present invention comprises, in order from the object side to the image side, a positive first lens group that does not move for zooming, and one or two negative sub-lens groups that move for zooming. The lens group includes a front moving lens group, a rear moving lens group including two sub-lens groups that move for zooming, and a final lens group that does not move for zooming.

The fact that the lens group does not move for zooming means that the lens group is not driven for the purpose of zooming, but if zooming and focus adjustment are performed at the same time, focus adjustment It is possible to move for.

FIG. 15 is an optical path diagram on-axis and off-axis (ω=30.2°) in the fifth lens unit L5 which is the final lens unit at the wide-angle end of the zoom lens of Numerical Example 1 described later. In the figure, it can be seen that the on-axis ray height is approximately constant, while the off-axis chief ray height passes through a higher position as it approaches the image plane. That is, while the contribution to the axial chromatic aberration is approximately constant in the fifth lens group, the contribution to the lateral chromatic aberration becomes large at a position near the image plane in the fifth lens group. Therefore, in order to satisfactorily correct the axial chromatic aberration and the lateral chromatic aberration, the lateral chromatic aberration is corrected by the rear lens in the fifth group, and the overcorrected axial chromatic aberration is corrected by the front lens in the fifth group. Will correct in the opposite direction. That is, in order to perform chromatic aberration correction including secondary spectrum correction in the fifth group, a material having high anomalous dispersion is used for the rear convex lens in the fifth group, and a material having low anomalous dispersion is used for the concave lens. Need to be used. However, as described above, a material having a high anomalous dispersion has a negative temperature coefficient of refractive index or is close to zero. In addition, as shown in Table 2, the material having low anomalous dispersion is present in the range where the temperature coefficient of refractive index exceeds 4. Therefore, it is difficult to suppress the focus shift due to the temperature change while correcting the axial chromatic aberration and the chromatic aberration of magnification.

Therefore, in the present invention, in order to satisfactorily correct the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range while suppressing the focus shift due to the temperature change on the wide angle side, the paraxial lateral magnification of the fifth lens group and the fifth The glass material in the lens group is set appropriately.

The zoom lens of the present invention comprises, in order from the object side to the image side, a positive first lens group that does not move for zooming, and one or two negative sub-lens groups that move for zooming. The lens group includes a front lens group that is moved, a rear lens group that includes two sub lens groups that move for zooming, and a final lens group that does not move for zooming.

The final lens group includes, in order from the object side to the image side, a negative lens group LA having a negative refractive power including a negative lens An and a positive lens group LB having a positive refractive power including a positive lens Bp. The lateral magnification of the final lens group is βL, the temperature coefficient of the refractive index of the negative lens An and the Abbe number are dNdTAn and νdAn, respectively, and the partial dispersion ratio and the Abbe number of the positive lens Bp are θgFBp and νdbp, respectively. 8≦βL≦3.0 (1)
−3.0≦dn/dTAn≦4.2 (2)
30.0≦νdAn≦70.2 (3)
0.01≦0.00162×ν dBp−0.6414+θgFBp≦0.05
...(4)
Meets The temperature coefficient of the refractive index is the temperature coefficient of the relative refractive index in the air of 20°C to 40°C, and the Abbe number ν and the partial dispersion ratio θ are g-line, F-line and d-line of the Fraunhofer line. , Ν=(Nd-1)/(NF-NC), where Ng, NF, Nd, and NC are the refractive indices for the C-line, respectively.
θ=(Ng-NF)/(NF-NC)
It is represented by.

Conditional expression (1) defines the lateral magnification of the final lens group. This makes it possible to suppress the focus shift due to the temperature change by appropriately contributing to the focus shift due to the temperature change on the object side of the final lens group.

If the upper limit of conditional expression (1) is exceeded, the zoom ratio of the final lens group will become small, making it difficult to achieve both wide-angle and compact zoom lenses. When the value goes below the lower limit of the conditional expression (1), the contribution to the focus shift due to the temperature change on the object side of the final group becomes too large, so that it becomes difficult to suppress the focus shift due to the temperature change. More preferably, conditional expression (1) should be set as follows.
0.83≦βL≦2.8 (1a)

Conditional expressions (2) to (4) define the glass material characteristics in the final lens group. As a result, it becomes possible to suppress the focus shift due to the temperature change while satisfactorily correcting the axial chromatic aberration and the lateral chromatic aberration.

If the upper limit of conditional expression (2) is exceeded, the effect of correcting the focus shift due to the temperature change by the negative lens will be reduced. If the lower limit of conditional expression (2) is exceeded, as described above, a material having high anomalous dispersion will be used, and axial chromatic aberration will be insufficiently corrected. More preferably, conditional expression (2) should be set as follows.
0.1≦dn/dTAn≦2.1 (2a)

If the upper and lower limits of conditional expression (3) are exceeded, it becomes difficult to achieve both axial chromatic aberration and lateral chromatic aberration. More preferably, conditional expression (3) should be set as follows.
35.0≦νdAn≦55.0 (3a)

If the lower limit of conditional expression (4) is exceeded, it becomes difficult to correct lateral chromatic aberration. More preferably, conditional expression (4) should be set as follows.
0.02≦0.00162×ν dBp−0.6414+θgFBp≦0.04
...(4a)

Further, in the present invention, the focal length of the negative lens group LA is fLA and the focal length of the negative lens An is fAn, and the conditional expression 0.3≦fAn/fLA≦1.5 (5)
Is preferably satisfied.

If the upper limit of conditional expression (5) is exceeded, the refractive power of the negative lens An becomes too weak, and it becomes difficult to obtain the focus correction effect due to temperature changes. If the lower limit of conditional expression (5) is exceeded, the refracting power of the negative lens An becomes too strong, making it difficult to correct various aberrations. More preferably, conditional expression (5) should be set as follows.
0.4≦fAn/fLA≦1.0 (5a)

Further, in the present invention, the negative lens group LA includes at least two negative lenses and one positive lens Ap, the Abbe number of the positive lens Ap is νdAp, the partial dispersion ratio is θgFAp, and the conditional expression 0≦0.00162 is satisfied. ×νdAp−0.6414+θgFAp≦0.02
...(6)
22.8<νdAp≦35.0 (7)
Is preferably satisfied.

If the upper and lower limits of conditional expressions (6) and (7) are not satisfied, axial chromatic aberration is overcorrected or undercorrected. Alternatively, the refractive power of each lens at the time of achromatization becomes too strong, which makes it difficult to correct various aberrations. More preferably, conditional expressions (6) and (7) should be set as follows.
0.002≦0.00162×νdAp−0.6414+θgFAp≦0.013
...(6a)
24.0≦νdAp≦31.0 (7a)

Further, in the present invention, the temperature coefficient of the refractive index of the positive lens Ap is dNdTAp, the focal length of the positive lens Ap is fAp, and the conditional expression −1.5≦fAp/fLA≦−0.3 (8)
−1.0≦dn/dndTAp≦6.0 (9)
Is preferably satisfied.

If the upper and lower limits of conditional expressions (8) and (9) are not satisfied, it will be difficult to suppress focus change due to temperature change. More preferably, conditional expressions (8) and (9) should be set as follows.
−1.1≦fAp/fLA≦−0.3 (8a)
3.0≦dn/dndTAp≦5.5 (9a)

Further, in the present invention, the focal length of the positive lens unit LB is fLB, the focal length of the positive lens Bp is fBp, and the Abbe number is νdBp. Conditional expression 17.4≤νdBp≤30.0 (10)
0.2≦fBp/fLB≦1.0 (11)
Is preferably satisfied.

If the upper and lower limits of conditional expressions (10) and (11) are not satisfied, it becomes difficult to correct the magnification aberration. More preferably, the conditional expressions (10) and (11) should be set as follows.
17.4≦νdBp≦25.5 (10a)
0.25≦fBp/fLB≦0.8 (11a)

The features of the lens configuration of the zoom lens of each embodiment of the present invention will be described below.

The zoom lens of Embodiment 1 of the present invention has, in order from the object side, a first lens unit L1 having a positive refractive power that does not move for zooming, and a second lens group having a negative refractive power that moves for zooming. A lens unit L2, a third lens unit L3 having a positive refractive power which moves for zooming, a fourth lens unit L4 having a positive refractive power which moves for zooming, and a lens unit L4 which moves for zooming. And a fifth lens unit L5 having a positive refractive power and having an image forming action. In each lens cross-sectional view, the left side indicates the subject (object) side (front side) and the right side indicates the image side (rear side).

The first lens group L1 includes a focus lens group L12 and a fixed lens group L11 that does not move for focusing. The focus lens unit L12 moves toward the object side when focusing from an infinitely distant object to a short-distance object. The zoom lens of the present embodiment moves on the optical axis while changing the lens spacing of each of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4, so that the zoom and the image plane associated with the zoom are changed. The fluctuation is corrected. These three lens groups (second lens group L2, third lens group L3, and fourth lens group L4) constitute a zoom system (variable magnification system).

FIG. 1 shows a lens cross-sectional view of a zoom lens of Embodiment 1 (Numerical Embodiment 1) of the present invention when an object at infinity is focused at the wide-angle end. In the lens cross-sectional view, on the image side of the fourth lens unit L4, in order from the object side, a stop (aperture stop) SP, a color separation prism shown as a glass block P, an optical filter, and the like, and an image pickup surface I are shown. The image pickup surface I corresponds to an image pickup surface such as a solid-state image pickup element (photoelectric conversion element) that receives and photoelectrically converts an image formed by a zoom lens. Further, by disposing a flare cut diaphragm FC that moves integrally with the third lens group in the third lens group, unnecessary light is cut off from the wide-angle end to the middle of the zoom. This also applies to the other embodiments.

In the zoom lens of Embodiment 1, the first lens unit L1 corresponds to the first lens surface to the twelfth lens surface. The second lens unit L2 corresponds to the thirteenth lens surface to the nineteenth lens surface. The third lens unit L3 corresponds to the 20th lens surface to the 26th lens surface. The fourth lens unit L4 corresponds to the 27th lens surface to the 31st lens surface. The fifth lens unit L5 corresponds to the 32nd lens surface to the 53rd lens surface. The LA group corresponds to the 33rd to 38th surfaces, and the LB group corresponds to the 39th to 53rd surfaces. The negative lens An is composed of the 33rd surface and the 34th surface, the positive lens Ap is composed of the 35th surface and the 36th surface, and the positive lens Bp is composed of the 47th surface and the 48th surface.

Further, the 33rd to 38th surfaces can be moved for stabilizing an image with a moving amount having a component in a direction perpendicular to the optical axis for vibration isolation. Furthermore, the 39th surface to the 43rd surface are retracted outside the optical axis when the extender is inserted, and the 39th Ex surface to the 48th Ex surface are inserted, so that the focal length of the entire system can be displaced to the long focal length side. Is.
The 13th lens surface, the 22nd lens surface, and the 31st lens surface have an aspherical shape.

FIG. 2 is a longitudinal aberration diagram of Numerical Example 1 at the wide-angle end (a) when focused on infinity, f=118.64 mm (b), the telephoto end (c), and the wide-angle end (d) when the extender is inserted. is there. Further, FIG. 3 is a lateral aberration diagram when the image stabilizing lens group shifts with respect to the optical axis by 0.7 mm at the telephoto end (a) and the telephoto end (b) when focusing on infinity in the numerical value example 1. ..

However, the focal length is a value when the value in the numerical example is expressed in mm. This is the same in each of the following examples. In each aberration diagram, the straight line, the two-dot chain line, the one-dot chain line, and the dotted line in the spherical aberration are the e-line, g-line, C-line, and F-line, respectively. The dotted line and the solid line in the astigmatism are the meridional image plane and the sagittal image plane, respectively, and the two-dot chain line, the one-dot chain line and the dotted line in the lateral chromatic aberration are the g-line, the C-line, and the F-line, respectively. ω is a half angle of view, and Fno is an F number. In the longitudinal aberration diagram, spherical aberration is 0.2 mm, astigmatism is 0.2 mm, distortion is 5%, and lateral chromatic aberration is 0.05 mm. In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the second lens unit L2 for zooming is located at both ends of a range in which the second lens unit L2 for zooming can move on the optical axis with respect to the mechanism.

Table 3 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when focusing on infinity in Numerical Example 1. Table 4 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when the extender is in focus at infinity.

Numerical data for Example 1 are shown below as Numerical Example 1. In the numerical example,
i is the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, di is the i-th and (i+1)th distance from the object side, and ndi and νdi are the i-th surfaces. And the Abbe number of the optical member between the (i+1)th surface. Aspherical surfaces are marked with * next to the surface number. The last three faces are glass blocks such as filters.

The aspherical shape has an X axis in the optical axis direction, an H axis in the direction perpendicular to the optical axis, a positive light traveling direction, R is a paraxial radius of curvature, k is a conical constant, A4, A5, A6, A7, A8, When A9, A10, A11, A12, A13, A14, A15, and A16 are aspherical coefficients, they are represented by the following equations. Moreover, "e-Z" means " ^x10 -Z." Note that the same description is made in the following numerical examples.

Table 10 shows the values corresponding to the respective conditional expressions of the present embodiment. The present embodiment satisfies the expressions (1) to (11), and the zoom in which the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range are well corrected while suppressing the focus shift due to the temperature change on the wide angle side. Has achieved the lens. It is essential for the zoom lens of the present invention to satisfy the expressions (1) to (4), but the expressions (5) to (11) may not be satisfied. However, if at least one of the expressions (5) to (11) is satisfied, a better effect can be obtained. This also applies to the other embodiments.

FIG. 14 is a schematic diagram of an image pickup apparatus (television camera system) using the zoom lens of each example as a photographing optical system. In FIG. 14, reference numeral 101 denotes the zoom lens according to any one of Embodiments 1 to 5. Reference numeral 124 is a camera. The zoom lens 101 is attachable to and detachable from the camera 124. Reference numeral 125 denotes an image pickup apparatus configured by mounting the zoom lens 101 on the camera 124. The zoom lens 101 has a first lens group F, a variable power portion LZ, and a rear group R for image formation. The first lens group F includes a focusing lens group. The variable power unit LZ includes a second lens group that moves on the optical axis for zooming, a third lens group, and a fourth lens group that moves on the optical axis to correct image plane variation due to zooming. Has been. SP is an aperture stop. Reference numerals 114 and 115 denote driving mechanisms such as a helicoid and a cam for driving the first lens group F and the variable power portion LZ in the optical axis direction. Reference numerals 116 to 118 denote motors (driving means) that electrically drive the driving mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 are encoders, potentiometers, photosensors, or other detectors for detecting the positions of the first lens group F and the variable power 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, 110 is a solid-state image sensor (photoelectric conversion device) 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 drives of the camera 124 and the zoom lens 101.

Thus, by applying the zoom lens of the present invention to a television camera, an image pickup apparatus having high optical performance is realized.

A zoom lens according to a second exemplary embodiment of the present invention includes, in order from the object side, a first lens unit L1 having a positive refractive power that is immovable for zooming, and a second lens unit L2 having a negative refractive power that moves during zooming. A third lens unit L3 having a positive refractive power that moves during zooming, a fourth lens unit L4 that has a positive refractive power that moves during zooming, and a positive refractive power having an immovable image-forming action for zooming. The fifth lens unit L5. In each lens cross-sectional view, the left side indicates the subject (object) side (front side) and the right side indicates the image side (rear side).

The first lens group L1 includes a focus lens group L12 and a fixed lens group L11 that does not move for focusing. The focus lens unit L12 moves toward the object side when focusing from an infinitely distant object to a short-distance object. The zoom lens of the present embodiment moves on the optical axis while changing the lens spacing of each of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4, so that the zoom and the image plane associated with the zoom are changed. The fluctuation is corrected. These three lens groups (second lens group L2, third lens group L3, and fourth lens group L4) form a zoom system (magnifying power group).

FIG. 4 shows a lens cross-sectional view of a zoom lens of Embodiment 2 (Numerical Embodiment 2) of the present invention when focusing on an object at infinity at the wide-angle end.

In the zoom lens of Example 2, the first lens unit L1 corresponds to the first lens surface to the twelfth lens surface. The second lens unit L2 corresponds to the thirteenth lens surface to the nineteenth lens surface. The third lens unit L3 corresponds to the 20th to 25th lens surfaces. The fourth lens unit L4 corresponds to the 26th lens surface to the 30th lens surface. The fifth lens unit L5 corresponds to the 31st lens surface to the 53rd lens surface. The LA group corresponds to the 32nd to 37th surfaces, and the LB group corresponds to the 38th to 53rd surfaces. The negative lens An is composed of the 32nd surface and the 33rd surface, the positive lens Ap is composed of the 34th surface and the 35th surface, and the positive lens Bp is composed of the 47th surface and the 48th surface.
The thirteenth lens surface, the twenty-first lens surface, and the thirtieth lens surface have an aspherical shape.

FIG. 5 is a longitudinal aberration diagram of Numerical Example 2 at the wide-angle end (a), f=70.52 mm (b), and the telephoto end (c) when focused on infinity.
In the longitudinal aberration diagram, spherical aberration is 0.2 mm, astigmatism is 0.2 mm, distortion is 5%, and lateral chromatic aberration is 0.05 mm.

Table 5 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when focusing on infinity in Numerical Example 2.

Table 10 shows the values corresponding to the respective conditional expressions of the present embodiment. This embodiment satisfies the expressions (1) to (11), and the zoom in which the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range are well corrected while suppressing the focus shift due to the temperature change on the wide angle side. Has achieved the lens.

The zoom lens according to the third exemplary embodiment of the present invention includes, in order from the object side, a first lens unit L1 having a positive refractive power that does not move for zooming, and a second lens unit L2 having a negative refractive power that moves during zooming. A third lens unit L3 having a positive refractive power that moves during zooming, a fourth lens unit L4 that has a positive refractive power that moves during zooming, and a positive refractive power having an immovable image-forming action for zooming. The fifth lens unit L5. In each lens cross-sectional view, the left side indicates the subject (object) side (front side) and the right side indicates the image side (rear side).

The first lens group L1 includes a focus lens group L12 and fixed lens groups L11 and L13 that do not move for focusing. The focus lens unit L12 moves toward the image side when focusing from an object at infinity to a near object. The zoom lens of the present embodiment moves on the optical axis while changing the lens spacing of each of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4, so that the zoom and the image plane associated with the zoom are changed. The fluctuation is corrected. These three lens groups (second lens group L2, third lens group L3, and fourth lens group L4) form a zoom system (magnifying power group).

FIG. 6 is a lens cross-sectional view of the zoom lens of Embodiment 3 (Numerical Embodiment 3) of the present invention when focusing on an object at infinity at the wide-angle end.

In the zoom lens of Example 3, the first lens unit L1 corresponds to the first lens surface to the nineteenth lens surface. The second lens unit L2 corresponds to the 20th lens surface to the 26th lens surface. The third lens unit L3 corresponds to the 27th lens surface to the 34th lens surface. The fourth lens unit L4 corresponds to the 35th lens surface to the 38th lens surface. The fifth lens unit L5 corresponds to the 39th lens surface to the 60th lens surface. The LA group corresponds to the 40th to 44th surfaces, and the LB group corresponds to the 45th to 60th surfaces. The negative lens An is composed of the 40th surface and the 41st surface, the positive lens Ap is composed of the 42nd surface and the 43rd surface, and the positive lens Bp is composed of the 54th surface and the 55th surface.
The 20th lens surface, the 29th lens surface, and the 37th lens surface have an aspherical shape.

FIG. 7 is a longitudinal aberration diagram of Numerical Example 3 at the wide-angle end (a), f=99.40 mm (b), and the telephoto end (c) when focused on infinity.
In the longitudinal aberration diagram, spherical aberration is 0.2 mm, astigmatism is 0.2 mm, distortion is 5%, and lateral chromatic aberration is 0.05 mm.

Table 6 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when focusing on infinity in Numerical Example 3.
Table 10 shows the values corresponding to the respective conditional expressions of the present embodiment. The present embodiment satisfies the expressions (1) to (11), and the zoom in which the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range are well corrected while suppressing the focus shift due to the temperature change on the wide angle side. Has achieved the lens.

The zoom lens according to Example 4 of the present invention includes, in order from the object side, a first lens unit L1 having a positive refractive power that is immovable for zooming, and a second lens unit L2 having a negative refractive power that moves during zooming. A third lens unit L3 having a positive refractive power that moves during zooming, a fourth lens unit L4 that has a positive refractive power that moves during zooming, and a positive refractive power having an immovable image-forming action for zooming. The fifth lens unit L5. In each lens cross-sectional view, the left side indicates the subject (object) side (front side) and the right side indicates the image side (rear side).

The first lens group L1 includes a focus lens group L12 and fixed lens groups L11 and L13 that do not move for focusing. The focus lens unit L12 moves toward the image side when focusing from an object at infinity to a near object. The zoom lens of the present embodiment moves on the optical axis while changing the lens spacing of each of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4, so that the zoom and the image plane associated with the zoom are changed. The fluctuation is corrected. These three lens groups (second lens group L2, third lens group L3, and fourth lens group L4) form a zoom system (magnifying power group).

FIG. 8 is a lens cross-sectional view of the zoom lens of Embodiment 4 (Numerical Embodiment 4) of the present invention when focusing on an object at infinity at the wide-angle end.

In the zoom lens of Example 4, the first lens unit L1 corresponds to the first lens surface to the nineteenth lens surface. The second lens unit L2 corresponds to the 20th lens surface to the 26th lens surface. The third lens unit L3 corresponds to the 27th lens surface to the 33rd lens surface. The fourth lens unit L4 corresponds to the 34th lens surface to the 37th lens surface. The fifth lens unit L5 corresponds to the 38th lens surface to the 59th lens surface. The LA group corresponds to the 39th to 43rd surfaces, and the LB group corresponds to the 44th to 59th surfaces. The negative lens An is composed of the 39th surface and the 40th surface, the positive lens Ap is composed of the 41st surface and the 42nd surface, and the positive lens Bp is composed of the 53rd surface and the 54th surface.
The 20th lens surface, the 28th lens surface, and the 36th lens surface have an aspherical shape.

FIG. 9 is a longitudinal aberration diagram of Numerical Example 4 at the wide-angle end (a), f=66.57 mm (b), and the telephoto end (c) when focused on an object at infinity.
In the longitudinal aberration diagram, spherical aberration is 0.2 mm, astigmatism is 0.2 mm, distortion is 5%, and lateral chromatic aberration is 0.05 mm.

Table 7 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when focusing on infinity in Numerical Example 4.
Table 10 shows the values corresponding to the respective conditional expressions of the present embodiment. The present embodiment satisfies the expressions (1) to (11), and the zoom in which the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range are well corrected while suppressing the focus shift due to the temperature change on the wide angle side. Has achieved the lens.

The zoom lens according to Example 5 of the present invention includes, in order from the object side, a first lens unit L1 having a positive refractive power that is immovable for zooming, and a second lens unit L2 having a negative refractive power that moves during zooming. A third lens unit L3 having a positive refractive power that moves during zooming, a fourth lens unit L4 that has a positive refractive power that moves during zooming, and a positive refractive power having an immovable image-forming action for zooming. The fifth lens unit L5. In each lens cross-sectional view, the left side indicates the subject (object) side (front side) and the right side indicates the image side (rear side).

The first lens group L1 includes a focus lens group L12 and a fixed lens group L11 that does not move for focusing. The focus lens unit L12 moves toward the object side when focusing from an infinitely distant object to a short-distance object. The zoom lens of the present embodiment moves on the optical axis while changing the lens spacing of each of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4, so that the zoom and the image plane associated with the zoom are changed. The fluctuation is corrected. These three lens groups (second lens group L2, third lens group L3, and fourth lens group L4) form a zoom system (magnifying power group).

FIG. 10 is a lens cross-sectional view of the zoom lens of Embodiment 5 (Numerical Embodiment 5) of the present invention when focusing on an object at infinity at the wide-angle end.

In the zoom lens of Embodiment 5, the first lens unit L1 corresponds to the first lens surface to the twelfth lens surface. The second lens unit L2 corresponds to the thirteenth lens surface to the nineteenth lens surface. The third lens unit L3 corresponds to the 20th lens surface to the 26th lens surface. The fourth lens unit L4 corresponds to the 27th lens surface to the 31st lens surface. The fifth lens unit L5 corresponds to the 32nd lens surface to the 53rd lens surface. The LA group corresponds to the 33rd to 38th surfaces, and the LB group corresponds to the 39th to 53rd surfaces. The negative lens An is composed of the 33rd surface and the 34th surface, the positive lens Ap is composed of the 35th surface and the 36th surface, and the positive lens Bp is composed of the 47th surface and the 48th surface.
The 13th lens surface, the 22nd lens surface, and the 31st lens surface have an aspherical shape.

FIG. 11 is a longitudinal aberration diagram of Numerical Example 5 at the wide-angle end (a), f=118.64 mm (b), and the telephoto end (c) when focused on infinity.
In the longitudinal aberration diagram, the spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 5%, and the lateral chromatic aberration is drawn on a scale of 0.1 mm.

Table 8 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when focusing on infinity in Numerical Example 5.
Table 10 shows the values corresponding to the respective conditional expressions of the present embodiment. The present embodiment satisfies the expressions (1) to (11), and the zoom in which the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range are well corrected while suppressing the focus shift due to the temperature change on the wide angle side. Has achieved the lens.

The zoom lens according to Example 6 of the present invention includes, in order from the object side, a first lens unit L1 having a positive refractive power that is immovable for zooming, and a second lens unit L2 having a negative refractive power that moves during zooming. A third lens unit L3 having a negative refractive power which moves during zooming, a fourth lens unit L4 having a positive refractive power which moves during zooming, a fifth lens unit L5 having a positive refractive power which moves during zooming, For the purpose of doubling, it is composed of a sixth lens unit L6 having a positive refractive power and having an immovable image forming action. In each lens cross-sectional view, the left side indicates the subject (object) side (front side) and the right side indicates the image side (rear side).

The first lens group L1 includes a focus lens group L12 and a fixed lens group L11 that does not move for focusing. The focus lens unit L12 moves toward the object side when focusing from an infinitely distant object to a short-distance object. The zoom lens of the present embodiment moves on the optical axis while changing the lens spacing of each of the second lens group L2, the third lens group L3, the fourth lens group L4, and the fifth lens group L5, thereby zooming. And the image plane variation due to zooming is corrected. The four lens groups (second lens group L2, third lens group L3, fourth lens group L4, and fifth lens group L5) constitute a zoom system (magnifying power group).

FIG. 12 shows a lens cross-sectional view of a zoom lens of Embodiment 6 (Numerical Embodiment 6) of the present invention when focusing on an object at infinity at the wide-angle end.

In the zoom lens of Example 6, the first lens unit L1 corresponds to the first lens surface to the tenth lens surface. The second lens unit L2 corresponds to the eleventh lens surface to the fifteenth lens surface. The third lens unit L3 corresponds to the 16th lens surface to the 17th lens surface. The fourth lens unit L4 corresponds to the 18th lens surface to the 23rd lens surface. The fifth lens unit L5 corresponds to the 24th lens surface to the 28th lens surface. The sixth lens unit L6 corresponds to the 30th lens surface to the 51st lens surface. The LA group corresponds to the 30th to 35th surfaces, and the LB group corresponds to the 36th to 51st surfaces. The negative lens An is composed of the 30th surface and the 31st surface, the positive lens Ap is composed of the 32nd surface and the 33rd surface, and the positive lens Bp is composed of the 45th surface and the 46th surface.
The eleventh lens surface, the seventeenth lens surface, the nineteenth lens surface, and the twenty-seventh lens surface have an aspherical shape.

FIG. 13 is a longitudinal aberration diagram for Numerical Example 6 at the wide-angle end (a), f=100.00 mm (b), and the telephoto end (c) when focused on infinity.
In the longitudinal aberration diagram, spherical aberration is 0.2 mm, astigmatism is 0.2 mm, distortion is 5%, and lateral chromatic aberration is 0.05 mm.

Table 9 shows the amount of focus change when the temperature changes by 1° C. at the wide-angle end when focusing on infinity in Numerical Example 6.
Table 10 shows the values corresponding to the respective conditional expressions of the present embodiment. The present embodiment satisfies the expressions (1) to (11), and the zoom in which the axial chromatic aberration and the lateral chromatic aberration in the entire zoom range are well corrected while suppressing the focus shift due to the temperature change on the wide angle side. Has achieved the lens.

As described above, by applying the zoom lens of the present invention to a television camera, an image pickup apparatus having high optical performance and highly accurately corrected focus deviation with respect to a change in environmental temperature is realized.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.

<Numerical Example 1>
Unit mm

Surface number rd nd vd θgF dn/dT
1 -2942.18811 6.00000 1.834810 42.74 0.5648 5.3
2 335.45859 1.80000
3 335.06633 23.70767 1.433870 95.10 0.5373 -10.1
4 -1057.92901 0.20000
5 525.29863 14.68252 1.433870 95.10 0.5373 -10.1
6 -2449.90453 25.25075
7 377.04224 20.53079 1.433870 95.10 0.5373 -10.1
8 -1365.49684 0.25000
9 306.95406 16.15620 1.433870 95.10 0.5373 -10.1
10 1716.23164 1.49946
11 188.24393 16.19337 1.438750 94.66 0.5340 6.2
12 408.07756 (variable)
13* -532.82374 2.20000 2.003300 28.27 0.5980 10.1
14 38.13165 11.72245
15 -44.54614 1.45000 1.743198 49.34 0.5531 6.6
16 72.56546 9.77415 1.892860 20.36 0.6393 1.9
17 -46.48441 1.62858
18 -41.75805 2.00000 1.882997 40.76 0.5667 5.2
19 -152.60813 (variable)
20 (flare cut) 30.00000
21 152.33559 11.49260 1.729157 54.68 0.5444 4.1
22* -265.71450 6.61910
23 139.88768 13.50202 1.438750 94.66 0.5340 -6.2
24 -246.30392 0.49825
25 264.09410 2.60000 1.854780 24.80 0.6122 4.9
26 97.10593 (variable)
27 86.50601 15.38886 1.496999 81.54 0.5375 -6.1
28 -236.96933 0.50000
29 415.87662 2.50000 1.805181 25.42 0.6161 1.8
30 139.36202 7.84908 1.603112 60.64 0.5415 3.2
31* -764.20052 (variable)
32 (aperture) 4.83283
33 -137.48989 1.40000 1.717004 47.92 0.5605 0.1
34 46.21721 0.44374
35 33.66049 4.52269 1.854780 24.80 0.6122 4.9
36 98.88257 3.01799
37 -252.81608 1.40000 1.891900 37.13 0.5780 5.6
38 78.97573 20.12699
39 -19240.92792 4.33387 1.487490 70.23 0.5300 -0.7
40 -38.41948 1.18634
41 -53.79231 1.60000 1.882997 40.76 0.5667 5.2
42 19.83504 9.34390 1.639799 34.46 0.5922 2.8
43 -49.11662 17.12285
44 -127.14477 7.14294 1.516330 64.14 0.5353 2.8
45 -26.14091 1.02057
46 -84.74111 1.80000 2.001000 29.13 0.5997 5.0
47 19.84757 12.37254 1.808095 22.76 0.6307 0.4
48 -78.29937 0.19910
49 804.51016 8.60002 1.548141 45.79 0.5686 2.0
50 -22.37499 1.80000 1.854780 24.80 0.6122 4.9
51 -80.59245 11.61779
52 -58.20663 8.07646 1.487490 70.23 0.5300 -0.7
53 -27.77017 9.49978
54 ∞ 63.04000 1.608590 46.44 0.5664 2.0
55 ∞ 8.70000 1.516330 64.15 0.5352 3.0
56 ∞ 11.00000
Image plane

Aspheric surface data surface 13
K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400 e-022
A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020

Surface 22
K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16= -4.73901e-027
A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025

Surface 31
K = -2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026
A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025

Various data Zoom ratio 56.00
Wide-angle mid-telephoto focal length 14.30 118.64 800.80
F number 2.95 2.95 4.28
Angle of view 32.90 4.46 0.66
Image height 9.25 9.25 9.25
Total lens length 730.20 730.20 730.20
BF 11.00 11.00 11.00

d12 3.47 140.71 188.97
d19 259.33 80.94 9.68
d26 4.21 15.98 6.78
d31 2.99 32.37 64.58
d56 11.00 11.00 11.00

Extender surface number rd nd vd θgF dn/dT
38 78.97573 7.65521
39Ex 22.65484 7.83222 1.438750 94.66 0.5340 -6.2
40Ex -77.99915 0.62769
41Ex 55.95873 5.04320 1.761821 26.52 0.6136 2.4
42Ex -31.40411 0.92000 2.050900 26.94 0.6054 5.4
43Ex 23.19638 2.69003
44Ex 67.41261 0.90000 1.882997 40.76 0.5667 5.2
45Ex 14.96828 6.40169 1.784723 25.68 0.6161 2.1
46Ex -68.68675 3.40456
47Ex -142.00060 0.80000 1.834810 42.74 0.5648 5.3
48Ex 69.66418 17.43936

Various data when the extender is inserted or removed

Wide-angle mid-telephoto focal length 21.45 177.96 1201.20
F number 4.42 4.43 6.42
Angle of view 23.33 2.98 0.44
Image height 9.25 9.25 9.25
Total lens length 730.20 730.20 730.20
BF 11.00 11.00 11.00

<Numerical Example 2>
Unit mm
Surface data Surface number rd nd vd θgF dn/dT
1 -2942.18811 6.00000 1.834810 42.74 0.5648 5.3
2 335.45859 1.80000
3 335.06633 23.70767 1.433870 95.10 0.5373 -10.1
4 -1057.92901 0.20000
5 525.29863 14.68252 1.433870 95.10 0.5373 -10.1
6 -2449.90453 25.25075
7 377.04224 20.53079 1.433870 95.10 0.5373 -10.1
8 -1365.49684 0.25000
9 306.95406 16.15620 1.433870 95.10 0.5373 -10.1
10 1716.23164 1.49946
11 188.24393 16.19337 1.438750 94.66 0.5340 -6.2
12 408.07756 (variable)
13* -532.82374 2.20000 2.003300 28.27 0.5980 10.1
14 38.13165 11.72245
15 -44.54614 1.45000 1.743198 49.34 0.5531 6.6
16 72.56546 9.77415 1.892860 20.36 0.6393 1.9
17 -46.48441 1.62858
18 -41.75805 2.00000 1.882997 40.76 0.5667 5.2
19 -152.60813 (variable)
20 152.33559 11.49260 1.729157 54.68 0.5444 4.1
21* -265.71450 6.61910
22 139.88768 13.50202 1.438750 94.66 0.5340 -6.2
23 -246.30392 0.49825
24 264.09410 2.60000 1.854780 24.80 0.6122 4.9
25 97.10593 (variable)
26 86.50601 15.38886 1.496999 81.54 0.5375 -6.1
27 -236.96933 0.50000
28 415.87662 2.50000 1.805181 25.42 0.6161 1.8
29 139.36202 7.84908 1.603112 60.64 0.5415 3.2
30* -764.20052 (variable)
31 (aperture) 5.24695
32 -117.24536 1.40000 1.762001 40.10 0.5765 4.0
33 41.72602 1.01137
34 36.11425 3.72703 1.854780 24.80 0.6122 4.9
35 81.40337 4.03279
36 -97.33562 1.70000 1.882997 40.76 0.5667 5.2
37 -206.67487 8.29194
38 -439.64699 1.50000 1.870700 40.73 0.5686 4.3
39 22.79520 7.14334 1.846660 23.87 0.6205 2.0
40 -277.85528 4.26902
41 -32.77439 1.50000 1.953750 32.32 0.5898 5.4
42 291.67966 7.83297 1.516330 64.14 0.5353 2.8
43 -26.75093 10.83649
44 2012.14987 4.62756 1.516330 64.14 0.5353 2.8
45 -58.46920 1.39998
46 -144.22960 1.50000 2.001000 29.13 0.5997 5.0
47 30.17606 9.22964 1.805181 25.42 0.6161 1.8
48 -72.85310 0.20000
49 103.12277 7.78391 1.438750 94.66 0.5340 -6.2
50 -35.13592 1.50000 2.001000 29.13 0.5997 5.0
51 -115.24911 0.20000
52 117.72591 7.13857 1.516330 64.14 0.5353 2.8
53 -40.99734 10.00000
54 ∞ 33.00000 1.608590 46.44 0.5664 2.0
55 ∞ 13.20000 1.516330 64.15 0.5352 3.0
56 ∞ 13.29000
Image plane

Aspheric surface data surface 13
K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400 e-022
A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020

Side 21
K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16= -4.73901e-027
A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025

Surface 30
K = -2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026
A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025

Various data Zoom ratio 120.00
Wide-angle mid-telephoto focal length 8.50 70.52 1020.00
F number 1.75 1.75 5.44
Angle of view 32.91 4.46 0.31
Image height 5.50 5.50 5.50
Total lens length 677.56 677.56 677.56
BF 13.29 13.29 13.29

d12 3.47 140.71 194.08
d19 289.33 110.94 2.00
d25 4.21 15.98 4.50
d30 2.99 32.37 99.42
d56 13.29 13.29 13.29

<Numerical value example 3>
Unit mm

Surface number rd nd vd θgF dn/dT
1 378.48165 5.35000 1.772499 49.60 0.5520 4.7
2 104.30474 48.15487
3 -173.47322 4.40000 1.696797 55.53 0.5434 4.2
4 671.08887 0.09299
5 254.55301 10.80583 1.805181 25.42 0.6161 1.8
6 1068.64458 6.57913
7 7885.69945 19.25204 1.433870 95.10 0.5373 -10.1
8 -182.52731 0.09864
9 -3663.98983 4.20000 1.720467 34.71 0.5834 3.9
10 247.17073 18.69132 1.496999 81.54 0.5375 -6.1
11 -364.03637 26.28305
12 690.30071 19.68226 1.433870 95.10 0.5373 -10.1
13 -214.30176 1.59065
14 167.28801 4.30000 1.755199 27.51 0.6103 2.6
15 114.35424 0.83582
16 117.62468 28.01647 1.496999 81.54 0.5375 -6.1
17 -2803.18358 0.08859
18 151.65937 14.73531 1.620411 60.29 0.5427 2.0
19 691.06916 (variable)
20* 556.45781 2.50000 1.772499 49.60 0.5520 4.7
21 43.70280 4.28305
22 64.47126 9.75889 1.808095 22.76 0.6307 0.4
23 -67.72978 1.50000 1.754999 52.32 0.5475 5.1
24 53.76655 7.53861
25 -42.51256 1.50000 1.882997 40.76 0.5667 5.2
26 -142.79643 (variable)
27 (flare cut) 15.00000
28 112.99500 7.64436 1.592400 68.30 0.5456 -9.2
29* -106.42637 0.09674
30 125.97027 8.85939 1.438750 94.93 0.5340 -6.6
31 -77.31383 0.49461
32 -91.08900 1.90000 1.755199 27.51 0.6103 2.6
33 622.86364 5.76098 1.438750 94.93 0.5340 -6.6
34 -94.88868 (variable)
35 1955.31277 2.00000 1.654115 39.68 0.5737 5.0
36 180.45807 0.49332
37* 135.06046 5.25584 1.696797 55.53 0.5434 4.2
38 -217.01028 (variable)
39 (Aperture) 4.24016
40 -73.06197 1.40000 1.717004 47.92 0.5605 0.1
41 27.73501 1.87771
42 31.69846 8.22365 1.854780 24.80 0.6122 4.9
43 -26.99013 1.40000 1.834810 42.74 0.5648 5.3
44 76.19040 9.09715
45 -26.77521 1.40000 1.910820 35.25 0.5824 5.8
46 63.13027 7.05970 1.850250 30.05 0.5979 3.5
47 -29.32982 3.28691
48 -68.62774 1.80000 1.959060 17.47 0.6598 5.0
49 49.21043 7.54051 1.720467 34.71 0.5834 3.9
50 -36.94636 26.22566
51 223.13006 8.41971 1.516330 64.14 0.5353 2.8
52 -37.16995 0.98432
53 -73.44174 1.50000 2.003300 28.27 0.5980 10.1
54 26.5 3783 8.45811 1.922860 18.90 0.6495 2.8
55 1358.45792 8.77341
56 190.00280 9.87280 1.438750 94.66 0.5340 -6.2
57 -25.03765 1.50000 1.882997 40.76 0.5667 5.2
58 -65.78893 0.28000
59 100.00000 7.20000 1.438750 94.66 0.5340 -6.2
60 -44.07496 10.00000
61 ∞ 63.04000 1.608590 46.44 0.5664 2.0
62 ∞ 8.70000 1.516330 64.15 0.5352 3.0
63 ∞ 10.00000
Image plane

Aspheric surface data Surface 20
K =-2.04859e+002 A 4= 6.64887e-007 A 6=-2.22325e-011 A 8=-1.47253e-013

Surface 29
K =-1.67902e+000 A 4= 6.35831e-007 A 6= 1.31051e-011 A 8= 3.96102e-014

Surface 37
K = 8.78418e+000 A 4=-5.94570e-007 A 6=-3.43946e-010 A 8= 7.66112e-014

Various data Zoom ratio 20.00
Wide-angle mid-telephoto focal length 11.40 99.40 228.00
F number 2.70 2.70 2.70
Angle of view 39.06 5.32 2.32
Image height 9.25 9.25 9.25
Total lens length 650.49 650.49 650.49
BF 10.00 10.00 10.00

d19 2.01 90.08 104.66
d26 145.80 35.50 2.65
d34 0.66 0.02 16.55
d38 2.00 24.87 26.61
d63 10.00 10.00 10.00

<Numerical Example 4>
Unit mm
Surface data Surface number rd nd vd θgF dn/dT
1 378.48165 5.35000 1.772499 49.60 0.5520 4.7
2 104.30474 48.15487
3 -173.47322 4.40000 1.696797 55.53 0.5434 4.2
4 671.08887 0.09299
5 254.55301 10.80583 1.805181 25.42 0.6161 1.8
6 1068.64458 6.57913
7 7885.69945 19.25204 1.433870 95.10 0.5373 -10.1
8 -182.52731 0.09864
9 -3663.98983 4.20000 1.720467 34.71 0.5834 3.9
10 247.17073 18.69132 1.496999 81.54 0.5375 -6.1
11 -364.03637 26.28305
12 690.30071 19.68226 1.433870 95.10 0.5373 -10.1
13 -214.30176 1.59065
14 167.28801 4.30000 1.755199 27.51 0.6103 2.6
15 114.35424 0.83582
16 117.62468 28.01647 1.496999 81.54 0.5375 -6.1
17 -2803.18358 0.08859
18 151.65937 14.73531 1.620411 60.29 0.5427 2.0
19 691.06916 (variable)
20* 556.45781 2.50000 1.772499 49.60 0.5520 4.7
21 43.70280 4.28305
22 64.47126 9.75889 1.808095 22.76 0.6307 0.1
23 -67.72978 1.50000 1.754999 52.32 0.5475 5.1
24 53.76655 7.53861
25 -42.51256 1.50000 1.882997 40.76 0.5667 5.2
26 -142.79643 (variable)
27 112.99500 7.64436 1.592400 68.30 0.5456 -9.2
28* -106.42637 0.09674
29 125.97027 8.85939 1.438750 94.93 0.5340 -6.6
30 -77.31383 0.49461
31 -91.08900 1.90000 1.755199 27.51 0.6103 2.6
32 622.86364 5.76098 1.438750 94.93 0.5340 -6.6
33 -94.88868 (variable)
34 1955.31277 2.00000 1.654115 39.68 0.5737 5.0
35 180.45807 0.49332
36* 135.06046 5.25584 1.696797 55.53 0.5434 4.2
37 -217.01028 (variable)
38 (aperture) 4.36998
39 -69.32187 1.40000 1.720000 43.69 0.5699 2.1
40 32.00339 1.36623
41 30.93487 7.67181 1.788800 28.43 0.6013 5.3
42 -31.00980 1.40000 1.729157 54.68 0.5444 4.1
43 55.71959 9.27740
44 -26.77521 1.40000 1.763850 48.49 0.5589 3.5
45 24.36654 9.07813 1.671390 31.32 0.6003 3.4
46 -41.17693 7.65711
47 -154.89411 1.80000 1.959060 17.47 0.6598 5.0
48 113.27398 8.19361 1.487490 70.23 0.5300 -0.7
49 -30.94758 7.98752
50 -2068.80257 7.06052 1.516330 64.14 0.5353 2.8
51 -32.31668 0.97277
52 -40.92605 1.50000 2.050900 26.94 0.6054 5.4
53 169.31954 5.55862 1.959060 17.47 0.6598 5.0
54 -70.41645 0.18568
55 162.66763 7.99349 1.438750 94.66 0.5340 -6.2
56 -34.53590 1.50000 1.854780 24.80 0.6122 4.9
57 -65.78893 0.28000
58 61.10877 7.20000 1.487490 70.23 0.5300 -0.7
59 -110.91719 10.00000
60 ∞ 33.00000 1.608590 46.44 0.5664 2.0
61 ∞ 13.20000 1.516330 64.14 0.5353 3.0
62 ∞ 10.00000
Image plane

Aspheric surface data Surface 20
K =-2.04859e+002 A 4= 6.64887e-007 A 6=-2.22325e-011 A 8=-1.47253e-013

Surface 28
K =-1.67902e+000 A 4= 6.35831e-007 A 6= 1.31051e-011 A 8= 3.96102e-014

Surface 36
K = 8.78418e+000 A 4=-5.94570e-007 A 6=-3.43946e-010 A 8= 7.66112e-014

Various data Zoom ratio 28.00
Wide-angle mid-telephoto focal length 6.75 66.57 189.00
F number 1.60 1.60 2.30
Angle of view 39.17 4.72 1.67
Image height 5.50 5.50 5.50
Total lens length 598.26 598.26 598.26
BF 10.00 10.00 10.00

d19 2.01 93.00 108.06
d26 160.80 46.17 1.24
d33 0.66 0.67 29.79
d37 2.00 25.63 26.38
d62 10.00 10.00 10.00

<Numerical Example 5>
Unit mm

Surface number rd nd vd θgF dn/dT
1 -2942.18811 6.00000 1.834810 42.74 0.5648 5.3
2 335.45859 1.80000
3 335.06633 23.70767 1.433870 95.10 0.5373 -10.1
4 -1057.92901 0.20000
5 525.29863 14.68252 1.433870 95.10 0.5373 -10.1
6 -2449.90453 25.25075
7 377.04224 20.53079 1.433870 95.10 0.5373 -10.1
8 -1365.49684 0.25000
9 306.95406 16.15620 1.433870 95.10 0.5373 -10.1
10 1716.23164 1.49946
11 188.24393 16.19337 1.438750 94.66 0.5340 -6.2
12 408.07756 (variable)
13* -532.82374 2.20000 2.003300 28.27 0.5980 10.1
14 38.13165 11.72245
15 -44.54614 1.45000 1.743198 49.34 0.5531 6.6
16 72.56546 9.77415 1.892860 20.36 0.6393 1.9
17 -46.48441 1.62858
18 -41.75805 2.00000 1.882997 40.76 0.5667 5.2
19 -152.60813 (variable)
20 0.00000 30.00000
21 152.33559 11.49260 1.729157 54.68 0.5444 4.1
22* -265.71450 6.61910
23 139.88768 13.50202 1.438750 94.66 0.5340 -6.2
24 -246.30392 0.49825
25 264.09410 2.60000 1.854780 24.80 0.6122 4.9
26 97.10593 (variable)
27 86.50601 15.38886 1.496999 81.54 0.5375 -6.1
28 -236.96933 0.50000
29 415.87662 2.50000 1.805181 25.42 0.6161 1.8
30 139.36202 7.84908 1.603112 60.64 0.5415 3.2
31* -764.20052 (variable)
32 (aperture) 4.83283
33 -137.48989 1.40000 1.717004 47.92 0.5605 0.1
34 46.21721 0.44374
35 33.66049 4.52269 1.854780 24.80 0.6122 4.9
36 98.88257 3.01799
37 -252.81608 1.40000 1.891900 37.13 0.5780 5.6
38 78.97573 (variable)
39 -19240.92792 4.33387 1.487490 70.23 0.5300 -0.7
40 -38.41948 1.18634
41 -53.79231 1.60000 1.882997 40.76 0.5667 5.2
42 19.83504 9.34390 1.639799 34.46 0.5922 2.8
43 -49.11662 (variable)
44 97.13860 6.39440 1.516330 64.14 0.5353 2.8
45 -29.52196 0.69035
46 -57.34743 1.80000 2.001000 29.13 0.5997 5.0
47 24.44504 7.53183 1.808095 22.76 0.6307 0.4
48 -64.92 800 0.59505
49 1409.95354 5.50212 1.548141 45.79 0.5686 2.0
50 -26.56416 1.80000 1.854780 24.80 0.6122 4.9
51 -123.45471 6.71153
52 -43.73629 4.87990 1.487490 70.23 0.5300 -0.7
53 -28.53682 19.64778
54 ∞ 33.00000 1.608590 46.44 0.5664 2.0
55 ∞ 13.20000 1.516330 64.15 0.5352 3.0
56 ∞ 11.00000
Image plane

Aspheric surface data surface 13
K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400 e-022
A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020

Surface 22
K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16= -4.73901e-027
A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025

Surface 31
K = -2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026
A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025

Various data Zoom ratio 120.00
Wide-angle mid-telephoto focal length 14.30 118.64 1715.99
F number 2.95 2.95 9.17
Angle of view 21.04 2.65 0.18
Image height 5.50 5.50 5.50
Total lens length 696.00 696.00 696.00
BF 11.00 11.00 11.00

d12 3.47 140.71 194.08
d19 259.33 80.94 -28.00
d26 4.21 15.98 4.50
d31 2.99 32.37 99.42
d56 11.00 11.00 11.00

<Numerical Example 6>
Unit mm

Surface number rd nd vd θgF dn/dT
1 8902.10794 5.50000 1.834810 42.74 0.5648 5.3
2 293.03147 1.99995
3 299.65364 31.10908 1.433870 95.10 0.5373 -10.1
4 -514.32273 24.92526
5 303.46268 19.33457 1.433870 95.10 0.5373 -10.1
6 6129.82590 0.11000
7 247.80998 23.99668 1.433870 95.10 0.5373 -10.1
8 -7103.04474 1.49952
9 181.46264 14.73458 1.438750 94.66 0.5340 -6.2
10 337.17717 (variable)

11* -189.28261 2.20000 2.003300 28.27 0.5980 10.1
12 37.39179 11.68058
13 -43.41246 1.45000 1.800000 29.84 0.6017 4.9
14 53.80711 13.13593 1.892860 20.36 0.6393 1.9
15 -37.78691 (variable)

16 -33.14955 2.00000 1.816000 46.62 0.5568 5.9
17* -95.42316 (variable)

18 138.00593 10.59290 1.729157 54.68 0.5444 4.3
19* -541.13392 9.75028
20 147.03615 14.32052 1.496999 81.54 0.5375 -6.1
21 -160.09082 1.72518
22 173.67525 2.60000 1.854780 24.80 0.6122 4.9
23 80.58130 (variable)

24 79.07338 13.01608 1.438750 94.66 0.5340 -6.2
25 -620.46050 2.50000 1.854780 24.80 0.6122 4.9
26 399.95751 2.38502
27* 249.93337 8.85506 1.603112 60.64 0.5415 3.2
28 -170.41073 (variable)

29 0.00000 4.64798
30 -210.17118 1.40000 1.762001 40.10 0.5765 4.0
31 32.51053 1.46838
32 32.25167 4.10760 1.854780 24.80 0.6122 4.9
33 88.14868 3.56708
34 -118.14810 1.70000 1.882997 40.76 0.5667 5.2
35 -886.06913 8.58634
36 -95.94284 1.50000 1.870700 40.73 0.5686 3.9
37 27.24766 7.04925 1.846660 23.87 0.6205 2.0
38 -79.28097 3.14883
39 -35.05 122 1.50000 1.953750 32.32 0.5898 5.3
40 171.78890 7.74533 1.516330 64.14 0.5353 2.8
41 -27.74785 12.13831
42 183.33936 5.22837 1.516330 64.14 0.5353 2.8
43 -57.35707 1.39996
44 -104.46964 1.50000 2.001000 29.13 0.5997 5.0
45 28.33700 8.85815 1.805181 25.42 0.6161 1.8
46 -90.21737 0.20000
47 150.63233 7.39248 1.438750 94.66 0.5340 -6.2
48 -33.52467 1.50000 2.001000 29.13 0.5997 5.0
49 -80.89823 0.20000
50 91.59160 7.30309 1.516330 64.14 0.5353 2.8
51 -42.72106 10.00000
52 ∞ 33.00000 1.608590 46.44 0.5664 2.0
53 ∞ 13.20000 1.516330 64.15 0.5352 3.0
54 ∞ 13.28712
Image plane

Aspheric surface data surface 11
K = 0.00000e+000 A 4= 2.28615e-006 A 6=-1.38289e-009 A 8= 7.22628e-012 A10=-4.35752e-014 A12= 1.34169e-016 A14=-1.96183e-019 A16= 1.10092e-022

Surface 17
K = 0.00000e+000 A 4=-1.76959e-007 A 6=-1.58573e-010 A 8= 2.80712e-013 A10=-2.98755e-017 A12=-3.73787e-018 A14= 9.74883e-021 A16 =-7.35536e-024

Side 19
K = 0.00000e+000 A 4= 2.97276e-007 A 6= 2.55441e-012 A 8=-7.60558e-015 A10= 3.19715e-017 A12=-3.61423e-020 A14= 1.79078e-023 A16=- 3.33963e-027

27th side
K = 0.00000e+000 A 4=-3.10347e-007 A 6= 2.06311e-011 A 8=-2.66872e-013 A10= 9.66509e-016 A12=-3.30933e-018 A14=-2.42884e-021 A16 = 2.13705e-026
A13= 1.43782e-019 A15= 1.37717e-023


Various data Zoom ratio 100.00
Wide-angle mid-telephoto focal length 8.20 100.00 820.00
F number 1.75 1.75 4.30
Angle of view 33.85 3.15 0.38
Image height 5.50 5.50 5.50
Total lens length 681.63 681.63 681.63
BF 13.29 13.29 13.29

d10 4.14 158.05 192.85
d15 1.71 4.89 1.49
d17 287.83 93.94 3.22
d23 3.91 6.06 10.25
d28 2.99 37.63 92.77
d54 13.29 13.29 13.29

Claims (8)

From the object side to the image side, in order, a positive first lens group that does not move for zooming, and a front-moving lens group that is composed of one or two negative sub-lens groups that move for zooming. , A rear moving lens group composed of two sub-lens groups that move for zooming, and a final lens group that does not move for zooming,
The final lens group includes, in order from the object side to the image side, a negative lens group having a negative refractive power including a negative lens An and a positive lens group having a positive refractive power including a positive lens Bp,
The lateral magnification of the final lens group is βL, the temperature coefficient of the refractive index of the negative lens An and the Abbe number are dNdTAn and νdAn, respectively, and the partial dispersion ratio and the Abbe number of the positive lens Bp are θgFBp and νdBp, respectively. Formula 0.8≦β≦3.0
−3.0≦dn/dTAn≦4.2
30.0≦νdAn≦70.2
0.01≦0.00162×ν dBp−0.6414+θgFBp≦0.05
A zoom lens characterized by satisfying.
The temperature coefficient of the refractive index is the temperature coefficient of the relative refractive index in air at 20° C. to 40° C., and the Abbe number ν and the partial dispersion ratio θ are g-line, F-line, and d-line of the Fraunhofer line. , And N are the refractive indices for the C line and ν=(Nd-1)/(NF-NC), and θ=(Ng-NF)/(NF-NC), respectively.
It is represented by. If the focal length of the negative lens group is fLA and the focal length of the negative lens An is fAn, the conditional expression is 0.3≦fAn/fLA≦1.5.
The zoom lens according to claim 1, characterized in that: The negative lens group has at least two negative lenses and one positive lens Ap, and the Abbe number and the partial dispersion ratio of the positive lens Ap are νdAp and θgFAp, respectively, and conditional expression 0≦0.00162× νdAp-0.6414+θgFAp≦0.02
22.8<νdAp≦35.0
The zoom lens according to claim 1 or 2, characterized in that: The conditional expression −1.5≦fAp/fLA≦−0.3, where dNdTAp is the temperature coefficient of the refractive index of the positive lens Ap and fAp is the focal length of the positive lens Ap.
−1.0≦dn/dndTAp≦6.0
The zoom lens according to claim 3, wherein The negative lens group includes, in order from the object side, a negative lens, the positive lens Ap, and a negative lens, and is movable for stabilizing an image with a moving amount having a component in a direction perpendicular to the optical axis. The zoom lens according to any one of claims 1 to 4, wherein The zoom lens according to any one of claims 1 to 5, wherein the negative lens An is arranged closest to the object side in the negative lens group. If the focal length of the positive lens group is fLB and the focal length and Abbe number of the positive lens Bp are fBp and νdBp, respectively, the conditional expression 17.4≦νdBp≦30.0
0.2≦fBp/fLB≦1.0
The zoom lens according to any one of claims 1 to 6, characterized in that: The zoom lens according to any one of claims 1 to 7.
An image pickup device arranged on the image plane of the zoom lens,
An image pickup apparatus comprising:

Images