Zoom lens and imaging device

Abstract

To provide a zoom lens that is advantageous in terms of a wide angle, high zoom ratio, compact size and light weight, and high optical performance.SOLUTION: A zoom lens has, in order from an object side: a positive first lens group that does not move for zooming; two or more intermediate lens groups that move in the zooming; and a positive rear lens group, in which a mutual interval among adjacent lens groups changes in the zooming, and the zoom lens has an aperture stop that is arranged in the rear lens group, in the lens group adjacent to the real lens group, or between the lens group adjacent to the rear lens group and the rear lens group. The first lens group has, in order from the object side: a negative first sub-lens group that stands still for focusing; a positive second sub-lens group that moves for the focusing; and a positive third sub-lens group, in which a focal length of the first lens group, length on an optical axis from a surface closest to an image side of the first lens group to a rear-side principal point of the first lens group, and focal lengths at a wide-angle end and telephoto end are properly set.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a zoom lens and an imaging device. [Background technology]

[0002] Zoom lenses used in imaging devices such as television cameras, movie cameras, digital still cameras, and video cameras are required to be small and lightweight for high operability, as well as to have a wide angle of view, a high zoom ratio, and excellent optical performance. Furthermore, with the use of imaging elements compatible with high resolutions such as 4K and 8K, high resolution from the center to the periphery of the image and little chromatic aberration are required.

[0003] Patent Document 1 discloses a zoom lens that includes, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, multiple movable lens groups that move during zooming, and a rear lens group with positive refractive power that does not move for zooming. The first lens group includes a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power, and a third sub-lens group with positive refractive power, and the second sub-lens group moves for focusing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-203912 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 discloses a zoom lens with a half angle of view of about 35° at the wide-angle end and a zoom ratio of about 6. If an attempt is made to increase the angle of view or the zoom ratio of the zoom lens, the diameter of the first lens group increases, which can result in a larger zoom lens.

[0006] An object of the present invention is to provide a zoom lens that is advantageous in terms of, for example, a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Means for solving the problem]

[0007] In order to achieve the above object, the zoom lens of the present invention has, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming, and a rear lens group with positive refractive power, wherein the spacing between adjacent lens groups changes during zooming, and the spacing between adjacent lens groups is changed within the rear lens group, within a lens group adjacent to the rear lens group, or between the lens group adjacent to the rear lens group and the rear lens group. the first lens group comprises, in order from the object side to the image side, a first sub-lens group with negative refractive power that does not move for focusing, a second sub-lens group with positive refractive power that moves for focusing, and a third sub-lens group with positive refractive power, wherein the focal length of the first lens group is f1, the length on the optical axis from the surface of the first lens group closest to the image side to the rear principal point of the first lens group is bok1, the focal length of the zoom lens at the wide-angle end is fw, and the focal length of the zoom lens at the telephoto end is ft, 1.700≦(f1+bok1) / f1≦2.200 1.50≦f1 / fw≦4.00 7.1≦ft / fw≦10.0 The present invention is characterized in that the following conditional expression is satisfied: [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a zoom lens that is advantageous in terms of, for example, a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of a zoom lens according to Example 1 at the wide-angle end when focused on an object at infinity. [Figure 2]4A and 4B are diagrams illustrating aberrations of the zoom lens according to Example 1 when the zoom lens is focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 3] FIG. 10 is a cross-sectional view of the zoom lens according to Example 2 at the wide-angle end when focused on an object at infinity. [Figure 4] 10A and 10B are diagrams illustrating aberrations of the zoom lens according to Example 2 when focused on an object at infinity and at the wide-angle end and at the telephoto end. [Figure 5] FIG. 10 is a cross-sectional view of the zoom lens according to Example 3 at the wide-angle end when focused on an object at infinity. [Figure 6] 10A and 10B are diagrams illustrating aberrations of the zoom lens according to Example 3 when the zoom lens is focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 7] FIG. 10 is a cross-sectional view of the zoom lens according to Example 4 at the wide-angle end when focused on an object at infinity. [Figure 8] 10A and 10B are diagrams illustrating aberrations of the zoom lens according to Example 4 when the zoom lens is focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 9] FIG. 10 is a cross-sectional view of the zoom lens according to Example 5 at the wide-angle end when focused on an object at infinity. [Figure 10] 10A and 10B are diagrams illustrating aberrations of the zoom lens according to Example 5 when the zoom lens is focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 11] FIG. 13 is a cross-sectional view of the zoom lens according to Example 6 at the wide-angle end when focused on an object at infinity. [Figure 12] 10A and 10B are diagrams illustrating aberrations of the zoom lens according to Example 6 when the zoom lens is focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 13] FIG. 11 is a cross-sectional view of the zoom lens according to Example 7 at the wide-angle end when focused on an object at infinity. [Figure 14] 10A and 10B are diagrams showing aberrations of the zoom lens according to Example 7 when focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 15] FIG. 13 is a cross-sectional view of the zoom lens according to Example 8 at the wide-angle end when focused on an object at infinity. [Figure 16] 13A and 13B are diagrams showing aberrations of the zoom lens according to Example 8 when focused on an object at infinity, and at (a) the wide-angle end and (b) the telephoto end. [Figure 17] FIG. 1 illustrates an example of the configuration of an imaging device. [Figure 18] FIG. 1 is a schematic diagram showing the relationship between the Abbe number and the partial dispersion ratio of an optical material. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In principle (unless otherwise specified) throughout the drawings for describing the embodiments, the same components will be designated by the same reference numerals, and repeated explanations will be omitted.

[0011] The zoom lens of the present invention comprises, from the object side to the image side, a first lens group L1 with positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming, and a rear lens group with positive refractive power. In the zoom lens, the spacing between adjacent lens groups all changes during zooming. The aperture stop SP of the zoom lens is located within the rear lens group, within a lens group adjacent to the rear lens group, or between the rear lens group and a lens group adjacent to the rear lens group. The first lens group L1 comprises, from the object side to the image side, a first sub-lens group L11 with negative refractive power that does not move for focusing, a second sub-lens group L12 with positive refractive power that moves for focusing, and a third sub-lens group L13 with positive refractive power.

[0012] If the focal length of the first lens unit L1 is f1, the length on the optical axis from the final surface of the first lens unit L1 to the rear principal point of the first lens unit L1 is bok1, the focal length of the zoom lens at the wide-angle end is fw, and the focal length of the zoom lens at the telephoto end is ft, then 1.700≦(f1+bok1) / f1≦2.200 ···(1) 1.50≦f1 / fw≦4.00 (2) 7.1≦ft / fw≦10.0 (3) The following condition is satisfied.

[0013] Here, the technical significance of the above conditional expressions will be explained. Conditional expression (1) defines the condition for achieving a wide-angle, compact, and lightweight zoom lens. (f1+bok1) / f1 is the retro ratio of the first lens group L1. Increasing this retro ratio is advantageous for achieving a wide angle of view, but it also increases the diameter of the third sub-lens group L13 and the number of lenses in the first lens group L1. If the upper limit of conditional expression (1) is exceeded, the retro ratio of the first lens group L1 becomes excessively large, which increases the diameter of the third sub-lens group L13 too much, making it disadvantageous for achieving a compact and lightweight zoom lens. Furthermore, if the number of lenses in the first lens group L1 increases too much, it also becomes disadvantageous for achieving a compact and lightweight zoom lens. If the lower limit of conditional expression (1) is exceeded, the retro ratio of the first lens group L1 becomes excessively small, making it difficult to achieve a wide-angle zoom lens. Furthermore, the diameter of the lens closest to the object in the first lens unit L1 increases, which is disadvantageous in achieving a compact and lightweight zoom lens.

[0014] Conditional expression (2) defines the condition for obtaining a zoom lens that has a wide angle of view, is small and lightweight, and has high optical performance. If the upper limit of conditional expression (2) is exceeded, the diameter of the first lens unit L1 becomes large, making it difficult to obtain a compact zoom lens. If the lower limit of conditional expression (2) is not met, it becomes difficult to obtain a zoom lens with a wide angle of view or to keep aberrations (coma, field curvature, etc.) at the wide-angle end within the allowable range.

[0015] Conditional formula (3) defines the condition for obtaining a zoom lens with a high zoom ratio and high optical performance. If the upper limit of conditional formula (3) is exceeded, the focal length at the telephoto end becomes excessively long, making it difficult to obtain a small, lightweight zoom lens with high optical performance. If the lower limit of conditional formula (3) is exceeded, it becomes difficult to obtain a zoom lens with a high zoom ratio. The zoom lens of the present invention, which satisfies conditional formula (3), exhibits particularly high effects by satisfying conditional formulas (1) and (2). Furthermore, the zoom lens according to the embodiment of the present invention has 2.10≦ft / f1≦8.00 (4) It is preferable that the following condition be further satisfied:

[0016] Conditional formula (4) specifies the condition for achieving a zoom lens with a high zoom ratio, small size, light weight, and high optical performance. Increasing ft / f1 is advantageous for achieving a telephoto (high zoom ratio) zoom lens. However, it also makes it difficult to achieve a small, lightweight zoom lens because aberrations caused by the first lens unit L1 are magnified at the telephoto end. Exceeding the upper limit of conditional formula (4) makes it difficult to achieve a small, lightweight zoom lens because the focal length of the first lens unit L1 becomes excessively short. Alternatively, the number of lenses becomes excessively large, which is unfavorable for achieving a small, lightweight zoom lens. Falling below the lower limit of conditional formula (4) makes it difficult to achieve a telephoto (high zoom ratio) zoom lens because the focal length of the first lens unit L1 becomes excessively long. Alternatively, the amount of movement of the intermediate lens unit becomes excessively large, which is unfavorable for achieving a small, lightweight zoom lens.

[0017] In the zoom lens according to the embodiment of the present invention, the first lens group L1 has a lens G1 with negative refractive power closest to the object. In the zoom lens according to the embodiment of the present invention, the focal length of the lens G1 is fG1, and -5.50≦fG1 / fw≦-1.60 (5) It is preferable to further satisfy the following conditional expression. Conditional expression (5) defines the condition for achieving a compact first lens group L1. If the upper limit of conditional expression (5) is exceeded, the focal length of lens G1 becomes excessively short, increasing the diameter of the axial light beam at the telephoto end. As a result, the diameter of the third sub-lens group L13 increases, making it difficult to achieve a compact first lens group L1. If the lower limit of conditional expression (5) is not satisfied, the focal length of lens G1 becomes excessively long, placing the entrance pupil of the zoom lens excessively close to the object side, increasing the diameter of the first sub-lens group L11, making it difficult to achieve a compact first lens group L1.

[0018] In the zoom lens according to the embodiment of the present invention, the first sub-lens group L11 has a focal length of fGp, and 5.80≦fGp / fw≦20.60 (6) The present invention is characterized in that it has a lens Gp having a focal length fGp that satisfies the following condition:

[0019] Conditional expression (6) specifies the condition for obtaining a first lens group L1 in which chromatic aberration is well corrected. If the upper limit of conditional expression (6) is exceeded, the focal length of lens G1p becomes excessively long, which makes it difficult to satisfactorily correct chromatic aberration of the first sub-lens group L11, making it difficult to obtain a first lens group L1 in which chromatic aberration is well corrected. If the lower limit of conditional expression (6) is not exceeded, the focal length of lens G1p becomes excessively short, making it difficult to correct spherical aberration at the telephoto end. As a result, it becomes difficult to obtain a first lens group L1 in which aberrations are well corrected. Furthermore, in the zoom lens according to the embodiment of the present invention, the focal length of the lens G1 is fG1, and -2.10≦fG1 / f1≦-0.80 (7) It is preferable that the following condition be further satisfied: Conditional expression (7) defines the condition for achieving a compact first lens group L1. If the upper limit of conditional expression (7) is exceeded, the focal length of lens G1 becomes excessively short, increasing the diameter of the axial light beam at the telephoto end. As a result, the diameter of the third sub-lens group L13 increases, making it difficult to achieve a compact first lens group L1. If the lower limit of conditional expression (7) is not reached, the focal length of lens G1 becomes excessively long, placing the entrance pupil of the zoom lens too close to the object side, increasing the diameter of the first sub-lens group L11, making it difficult to achieve a compact first lens group L1.

[0020] Furthermore, in the zoom lens according to an embodiment of the present invention, when the focal length of the first sub-lens group L11 is f11, the focal length of the second sub-lens group L12 is f12, and the focal length of the third sub-lens group L13 is f13, it is preferable to further satisfy the following conditional expressions (8) to (10). -1.50≦f11 / f1≦-0.75 (8) 2.00≦f12 / f1≦4.40 (9) 1.30≦f13 / f1≦1.80 (10)

[0021] Conditional expressions (8) to (10) each define the conditions for obtaining a zoom lens with high optical performance. If conditional expression (8) is not satisfied, the focal length f1 of the first lens group L1 or the focal length f11 of the first sub-lens group L11 will be excessively small, making it difficult to keep the aberrations generated by the first lens group L1 or the first sub-lens group L11 within the allowable range.

[0022] If conditional expression (9) is not satisfied, the focal length f1 of the first lens group L1 or the focal length f12 of the second sub-lens group L12 will be excessively small, making it difficult to keep the aberrations generated by the first lens group L1 or the second sub-lens group L12 within the allowable range.

[0023] If conditional expression (10) is not satisfied, the focal length f1 of the first lens group L1 or the focal length f13 of the third sub-lens group L13 will be excessively small, making it difficult to keep the aberrations generated by the first lens group L1 or the third sub-lens group L13 within the allowable range.

[0024] Furthermore, in the zoom lens according to the embodiment of the present invention, the F-number of the zoom lens at the wide-angle end is Fnow, and 2.00≦Fnow≦3.50 (11) It is preferable to further satisfy the following conditional expression. Conditional expression (11) defines the condition for obtaining a bright zoom lens. If the lower limit of conditional expression (11) is not satisfied, it becomes difficult to keep aberrations (spherical aberration, astigmatism, etc.) at the wide-angle end within the allowable range. Alternatively, in order to obtain high optical performance, each lens group becomes excessively large, making it difficult to obtain a small and lightweight zoom lens.

[0025] Furthermore, in the zoom lens according to the embodiment of the present invention, the average value of the refractive indexes of all the negative lenses included in the first lens group L1 with respect to the d-line (wavelength 587.6 nm) is defined as nd1n, and 1.75≦nd1n≦2.00 (12) It is preferable to further satisfy the following conditional expression. Conditional expression (12) specifies the condition for obtaining a zoom lens that is small, lightweight, and has high optical performance. If the upper limit of conditional expression (12) is exceeded, it becomes difficult to obtain a lightweight first lens unit L1 because optical materials (glass materials) with high refractive indexes tend to have high specific gravity. If the lower limit of conditional expression (12) is not satisfied, the refractive index becomes too small, making it difficult to keep aberrations within the allowable range.

[0026] In the zoom lens according to the embodiment of the present invention, the first sub-lens group L11 has an Abbe number for the d-line of νd11p, and the Abbe number for the d-line of the first sub-lens group L11 is expressed as follows: 17.0≦νd11p≦25.0 (13) It is preferable to have a positive lens L11p having an Abbe number νd11p that satisfies the following condition: In the zoom lens according to the embodiment of the present invention, the third sub-lens group L13 has an Abbe number for the d-line of νd13n, where νd13n is the Abbe number for the d-line, and 20.0≦νd13n≦50.0 (14) It is preferable to have a negative lens L13n having an Abbe number νd13n that satisfies the following condition: In the zoom lens according to the embodiment of the present invention, the first sub-lens group L11 and the third sub-lens group L13 have an Abbe number for the d-line of νd11p and another Abbe number for the d-line of νd13n, 3.0≦νd13n−νd11p≦25.0 (15) It is preferable to have a positive lens L11p having an Abbe number νd11p that satisfies the following condition, and a negative lens L13n having an Abbe number νd13n that satisfies the following condition: νd11p<νd13n<νd13n.

[0027] Conditional expressions (13) to (15) define the conditions for keeping the axial chromatic aberration at the telephoto end and the fluctuation of the axial chromatic aberration due to focusing within the permissible range. 18 is a schematic diagram showing the relationship between the Abbe number ν and the partial dispersion ratio θ of an optical material. As can be seen from the figure, the optical material tends to exhibit anomalous dispersion such that the larger the partial dispersion ratio, the more the partial dispersion ratio deviates from the straight line indicated by the dashed line.

[0028] If the upper limit of conditional expression (13) is exceeded, it becomes difficult to keep the fluctuation in the secondary spectrum of axial chromatic aberration due to focusing within an allowable range, whereas if the lower limit of conditional expression (13) is not reached, anomalous dispersion becomes excessively high, making it difficult to keep the secondary spectrum of axial chromatic aberration at the telephoto end within an allowable range.

[0029] If the upper limit of conditional expression (14) is exceeded, it becomes difficult to keep the longitudinal chromatic aberration at the telephoto end within the allowable range, and if the lower limit of conditional expression (14) is not reached, it becomes difficult to keep the secondary spectrum of the longitudinal chromatic aberration at the telephoto end within the allowable range.

[0030] If conditional expression (15) is not satisfied, it becomes difficult to keep the longitudinal chromatic aberration at the telephoto end within the allowable range. In the zoom lens according to the embodiment of the present invention, the thickness of the first lens unit L1 on the optical axis is LD1, and 1.50≦LD1 / f1≦3.30 (16) It is preferable that the following condition be further satisfied:

[0031] Conditional expression (16) specifies the condition for achieving a compact, lightweight zoom lens with high optical performance. If the upper limit of conditional expression (16) is exceeded, the thickness of the first lens unit L1 becomes excessively long, making it difficult to achieve a compact, lightweight zoom lens. Alternatively, the focal length of the first lens unit L1 becomes excessively short, making it difficult to keep the fluctuations in aberrations associated with focusing at the telephoto end within an acceptable range. If the lower limit of conditional expression (16) is exceeded, the thickness of the first lens unit L1 becomes excessively short, making it difficult to include the number of lenses required to keep the fluctuations in aberrations associated with focusing within an acceptable range. Alternatively, the focal length of the first lens unit L1 becomes excessively long, making it difficult to achieve a compact, lightweight zoom lens.

[0032] Here, the zoom lens according to the embodiment of the present invention is for a camera with a diagonal image size (diagonal length) of 2Y, and the half angle of view at the wide-angle end is ωw, 41.2°≦ωw≦50.0° (17) It is preferable to further satisfy the following condition: where the half angle of view ωw is defined as fw, where fw is the focal length of the zoom lens at the wide-angle end. ωw=arctan(Y / fw) Conditional expression (17) defines the condition for obtaining a zoom lens that is wide-angle, compact, and lightweight. By satisfying conditional expression (17), a wide angle can be achieved for various format sizes. If the upper limit of conditional expression (17) is exceeded, it becomes difficult to obtain a compact and lightweight zoom lens.

[0033] Furthermore, the zoom lens according to the embodiment of the present invention is for a camera with a diagonal image size of 2Y, and the half angle of view at the telephoto end is ωt, and 4.30°≦ωt≦8.25° (18) It is preferable to further satisfy the following condition: where the half angle of view ωt is defined as follows, where ft is the focal length of the zoom lens at the telephoto end: ωt=arctan(Y / ft) Conditional expression (18) defines the condition for obtaining a zoom lens that has a narrow angle of view and is small and lightweight. By satisfying conditional expression (18), telephotography becomes possible for a variety of format sizes. If the lower limit of conditional expression (18) is not satisfied, it becomes difficult to obtain a small and lightweight zoom lens.

[0034] Furthermore, in the zoom lens according to the embodiment of the present invention, the length on the optical axis from the image-side surface of the lens closest to the image side, which has a finite focal length in the zoom lens, to the image plane is expressed as BFw, 0.280≦fw / BFw≦0.430 (19) It is preferable that the following condition be further satisfied:

[0035] Conditional expression (19) defines the condition for obtaining a zoom lens that has a wide angle of view and is compact and lightweight. If the upper limit of conditional expression (19) is exceeded, the focal length at the wide-angle end becomes excessively long relative to the back focus, making it difficult to obtain a zoom lens with a wide angle of view. If the lower limit of conditional expression (19) is not reached, the back focus becomes excessively long relative to the focal length at the wide-angle end, making it difficult to obtain a zoom lens that is compact and lightweight.

[0036] In addition, in the zoom lens according to the embodiment of the present invention, the first lens group L1 includes a first sub-lens group L11 with negative refractive power that does not move for focusing, a second sub-lens group L12 with positive refractive power that moves for focusing, and a third sub-lens group L13 with positive refractive power. This configuration allows fluctuations in aberrations associated with focusing to be within an acceptable range. The configuration of the first lens group L1 is not limited to three sub-lens groups L11, L12, and L13. For example, the first lens group L1 may include multiple sub-lens groups that move for focusing, or may include other sub-lens groups.

[0037] In addition, in the zoom lens according to the embodiment of the present invention, the third sub-lens group L13 preferably consists of five or fewer lenses. If the third sub-lens group L13 consists of six or more lenses, the first lens group L1 becomes large, making it difficult to obtain a compact and lightweight zoom lens.

[0038] In addition, in the zoom lens according to the embodiment of the present invention, in the first lens group L1, the third sub-lens group L13 and the sub-lens group closer to the image (rear side) than that preferably consist of a total of five or fewer lenses. If the third sub-lens group L13 and the sub-lens group closer to the image than that consist of a total of six or more lenses, the first lens group L1 will become large, making it difficult to achieve a compact and lightweight zoom lens.

[0039] In addition, in the zoom lens according to the embodiment of the present invention, it is preferable that the third sub-lens group L13 has two or more negative lenses. If the third sub-lens group L13 has only one negative lens, the refractive power of the negative lens in the third sub-lens group L13 will be too strong in order to perform chromatic aberration correction in the first lens group L1, making it difficult to correct various aberrations other than chromatic aberration, such as spherical aberration.

[0040] In the zoom lens according to the embodiment of the present invention, it is preferable that the first lens group L1 and the rear lens group are fixed during zooming, which keeps the overall glass length (the length from the front to the rear surface of the optical system) constant during zooming, thereby minimizing changes in the center of gravity. It is more preferable that the above-described conditional expressions (1) through (19) be replaced by the following conditional expressions (1a) through (19a), respectively. 1.780≦(f1+bok1) / f1≦2.100 (1a) 2.30≦f1 / fw≦3.20 (2a) 7.2≦ft / fw≦10.0 (3a) 2.370≦ft / f1≦4.550 (4a) -4.50≦fG1 / fw≦-2.00 (5a) 6.00≦fGp / fw≦15.00 (6a) -1.80≦fG1 / f1≦-1.00 (7a) -1.30≦f11 / f1≦-0.85 (8a) 2.20≦f12 / f1≦3.40 (9a) 1.435≦f13 / f1≦1.800 (10a) 2.20≦Fnow≦3.00 (11a) 1.76≦nd1n≦1.95 (12a) 17.0≦νd11p≦22.0 (13a) 23.0≦νd13n≦41.0 (14a) 3.0≦νd13n-νd11p≦20.0 (15a) 1.70≦LD1 / f1≦3.10 (16a) 42.90°≦ωw≦50.00° (17a) 4.50°≦ωt≦8.00° (18a) 0.300≦fw / BFw≦0.400 (19a) Hereinafter, Examples 1 to 8 of the zoom lens according to the embodiment of the present invention and corresponding Numerical Examples 1 to 8 will be described in detail. [Example]

[0041] Fig. 1 is a cross-sectional view of a zoom lens according to Example 1 of the present invention at the wide-angle end when focused on an object at infinity. Fig. 2 is a diagram showing aberrations of the zoom lens according to Example 1 when focused on an object at infinity, at (a) the wide-angle end and (b) the telephoto end (for the respective focal lengths, see Numerical Example 1).

[0042] The components of the zoom lens according to the first embodiment will be described with reference to FIG. The zoom lens according to Example 1 includes, in order from the object side to the image side, a first lens group L1 with positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming (a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power), and a fifth lens group L5 as a rear lens group with positive refractive power that does not move for zooming. In the zoom lens, the distances between adjacent lens groups all change during zooming. An aperture stop SP, which does not move for zooming, is located adjacent to the object side of the fifth lens group L5.

[0043] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0044] The first sub-lens group L11 does not move for focusing. The second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object. The third sub-lens group L13 does not move for focusing.

[0045] The second lens group L2 moves monotonically toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves along the optical axis in a locus that is convex toward the object side when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves non-monotonically along the optical axis when zooming from the wide-angle end to the telephoto end, as shown in Figure 1, for example. The fifth lens group L5 does not move when zooming. IP is the image plane (the surface where an image is formed) of the zoom lens, and the image sensor captures the image (takes an image).

[0046] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0047] The second lens group L2, the third lens group L3, and the fourth lens group L4, which are two or more intermediate lens groups, are composed of surfaces Nos. 19 to 33. The second lens group L2 is composed of surfaces Nos. 19 to 25 and consists of three negative lenses and one positive lens. The third lens group L3 is composed of surfaces Nos. 26 to 28 and consists of one negative lens and one positive lens. The fourth lens group L4 is composed of surfaces Nos. 29 to 33 and consists of one negative lens and two positive lenses. The aperture stop SP is composed of surface No. 34. The fifth lens group L5 is composed of surfaces Nos. 35 to 50 and consists of four negative lenses and six positive lenses.

[0048] FIG. 2 is a diagram showing aberrations in Example 1 (Numerical Example 1). In the aberration diagram of Figure 2, the solid, two-dot chain, one-dot chain, and dashed lines for spherical aberration correspond to the d-line (wavelength 587.6 nm), g-line (wavelength 435.8 nm), C-line (wavelength 656.3 nm), and F-line (wavelength 486.1 nm), respectively. The dashed and solid lines for astigmatism correspond to the meridional image plane and sagittal image plane, respectively. Distortion corresponds to the d-line. The solid, two-dot chain, one-dot chain, and dashed lines for lateral chromatic aberration correspond to the d-line, g-line, C-line, and F-line, respectively. Fno represents the F-number, and ω represents the half angle of view. Spherical aberration is plotted on a horizontal axis with a full scale of ±0.200 mm. Astigmatism is plotted on a horizontal axis with a full scale of ±0.200 mm. Distortion is plotted on a horizontal axis with a full scale of ±5.000%. The lateral chromatic aberration is plotted with the horizontal axis at a full scale of ±0.050 mm. The same applies to the aberration diagrams of Examples 2 to 8 described later.

[0049] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0050] 3 is a cross-sectional view of the zoom lens according to Example 2 when it is at the wide-angle end and focused on an object at infinity. The components of the zoom lens according to Example 2 will be described with reference to FIG. The zoom lens according to Example 2 includes, in order from the object side to the image side, a first lens group L1 with positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming (a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power), and a fifth lens group L5 as a rear lens group with positive refractive power that does not move for zooming. In the zoom lens, the distances between adjacent lens groups all change during zooming. An aperture stop SP, which does not move for zooming, is located adjacent to the object side of the fifth lens group.

[0051] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0052] The first sub-lens group L11 does not move for focusing, the second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object, and the third sub-lens group L13 does not move for focusing.

[0053] The second lens group L2 moves monotonically toward the image side on the optical axis for zooming from the wide-angle end to the telephoto end. The third lens group L3 moves first toward the object side and then toward the image side on the optical axis for zooming. The fourth lens group L4 moves non-monotonically along the optical axis for zooming (e.g., as shown in the figure).

[0054] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0055] The two or more intermediate lens groups, the second lens group L2, the third lens group L3, and the fourth lens group L4, are each composed of surfaces Nos. 19 to 33. The second lens group L2 is composed of surfaces Nos. 19 to 25 and consists of three negative lenses and one positive lens. The third lens group L3 is composed of surfaces Nos. 26 to 28 and consists of one negative lens and one positive lens. The fourth lens group L4 is composed of surfaces Nos. 29 to 33 and consists of one negative lens and two positive lenses. The aperture stop SP is composed of surface No. 34. The fifth lens group L5 is composed of surfaces Nos. 35 to 50 and consists of four negative lenses and six positive lenses. 4A and 4B are diagrams illustrating aberrations at (a) the wide-angle end and (b) the telephoto end of the zoom lens according to Example 2 when the zoom lens is focused on an object at infinity (see Numerical Example 2 for the respective focal lengths). The legend is the same as that described with reference to FIG. 2.

[0056] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0057] 5 is a cross-sectional view of the zoom lens according to Example 3 when it is at the wide-angle end and focused on an object at infinity according to Example 3. The components of the zoom lens according to Example 3 will be described with reference to FIG.

[0058] The zoom lens according to Example 3 includes, in order from the object side to the image side, a first lens group L1 with positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming (a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power), and a fifth lens group L5 as a rear lens group with positive refractive power that does not move for zooming. In the zoom lens, the spacing between adjacent lens groups all changes during zooming. An aperture stop SP is disposed adjacent to the image side of the fourth lens group L4 and moves together with the fourth lens group L4 during zooming.

[0059] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0060] The first sub-lens group L11 does not move for focusing. The second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object. The third sub-lens group L13 moves toward the object side for focusing from an object at infinity to a close object. Here, the ratio of the movement amount of the second sub-lens group L12 for focusing from an object at infinity to a close object to the movement amount of the third sub-lens group L13 for focusing from an object at infinity to a close object is 9:1.

[0061] The two or more intermediate lens groups that move during zooming consist, in order from the object side to the image side, of a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power. The second lens group L2 moves monotonically along the optical axis toward the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves first toward the object side and then toward the image side when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves non-monotonically along the optical axis when zooming from the wide-angle end to the telephoto end (for example, non-monotonically as shown in the figure).

[0062] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0063] The second lens group L2, the third lens group L3, and the fourth lens group L4, which are two or more intermediate lens groups, are composed of surfaces 19 to 33. The second lens group L2 is composed of surfaces 19 to 25 and consists of three negative lenses and one positive lens. The third lens group L3 is composed of surfaces 26 to 28 and consists of one negative lens and one positive lens. The fourth lens group L4 is composed of surfaces 29 to 33 and consists of one negative lens and two positive lenses. The aperture stop SP corresponds to surface 34. The fifth lens group L5 is composed of surfaces 35 to 50 and consists of four negative lenses and six positive lenses.

[0064] 6A and 6B are diagrams illustrating aberrations at (a) the wide-angle end and (b) the telephoto end of the zoom lens according to Example 3 when the zoom lens is focused on an object at infinity (see Numerical Example 3 for the respective focal lengths). The legend is the same as that described with reference to FIG. 2. Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0065] 7 is a cross-sectional view of the zoom lens according to Example 4 when it is at the wide-angle end and focused on an object at infinity. The components of the zoom lens according to Example 4 will be described with reference to FIG.

[0066] The zoom lens according to Example 4 includes, in order from the object side to the image side, a first lens unit L1 with positive refractive power that does not move for zooming, two or more intermediate lens units that move during zooming (a second lens unit L2 with negative refractive power, a third lens unit L3 with negative refractive power, a fourth lens unit L4 with negative refractive power, and a fifth lens unit L5 with positive refractive power), and a sixth lens unit L6 as a rear lens unit with positive refractive power that does not move for zooming. In the zoom lens, the spacing between adjacent lens units all changes during zooming. An aperture stop SP is disposed adjacent to the object side of the sixth lens unit L6 and does not move for zooming.

[0067] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0068] The first sub-lens group L11 does not move for focusing. The second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object. The third sub-lens group L13 moves toward the object side for focusing from an object at infinity to a close object. Here, the ratio of the movement amount of the second sub-lens group L12 for focusing from an object at infinity to a close object to the movement amount of the third sub-lens group L13 for focusing from an object at infinity to a close object is 9:1.

[0069] The two or more intermediate lens groups that move during zooming consist, in order from the object side to the image side, of a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with negative refractive power, and a fifth lens group L5 with positive refractive power.

[0070] The second lens group L2 moves monotonically toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves monotonically toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves first toward the object side and then toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The fifth lens group L5 moves (e.g., non-monotonically as shown) on the optical axis when zooming from the wide-angle end to the telephoto end.

[0071] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0072] The second lens group L2, the third lens group L3, the fourth lens group L4, and the fifth lens group L5, which are two or more intermediate lens groups, are composed of surfaces 19 to 35. The second lens group L2 is composed of surfaces 19 to 23 and consists of two negative lenses and one positive lens. The third lens group L3 is composed of surfaces 24 to 25 and consists of one negative lens. The fourth lens group L4 is composed of surfaces 26 to 30 and consists of two negative lenses and one positive lens. The fifth lens group L5 is composed of surfaces 31 to 35 and consists of one negative lens and two positive lenses. The aperture stop SP corresponds to surface 36. The sixth lens group L6 is composed of surfaces 37 to 52 and consists of four negative lenses and six positive lenses.

[0073] 8 is a diagram showing aberrations of the zoom lens according to Example 4 when focused on an object at infinity, at (a) the wide-angle end, and at (b) the telephoto end (for the respective focal lengths, see Numerical Example 4). The legend is the same as that described with reference to FIG. 2.

[0074] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0075] 9 is a cross-sectional view of the zoom lens according to Example 5 when it is at the wide-angle end and focused on an object at infinity. The components of the zoom lens according to Example 5 will be described with reference to FIG.

[0076] The zoom lens according to Example 5 includes, in order from the object side to the image side, a first lens unit L1 with positive refractive power that does not move for zooming, two or more intermediate lens units (a second lens unit L2 with negative refractive power and a third lens unit L3 with negative refractive power) that move during zooming, and a fourth lens unit L4 as a rear lens unit with positive refractive power that does not move for zooming. In the zoom lens, the spacing between adjacent lens units all changes during zooming. An aperture stop SP is disposed adjacent to the object side of the fourth lens unit L4 and does not move for zooming.

[0077] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0078] The first sub-lens group L11 does not move for focusing, the second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object, and the third sub-lens group L13 does not move for focusing.

[0079] The two or more intermediate lens groups that move during zooming are, in order from the object side to the image side, a second lens group L2 with negative refractive power and a third lens group L3 with negative refractive power. The second lens group L2 moves monotonically toward the image side along the optical axis when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves first toward the object side and then toward the image side along the optical axis when zooming from the wide-angle end to the telephoto end.

[0080] The first lens group L1 consists of surfaces 1 to 16. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 to 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 16 and consists of three positive lenses and two negative lenses.

[0081] The second lens group L2 and the third lens group L3, which are two or more intermediate lenses, are composed of surfaces 17 to 26. The second lens group L2 is composed of surfaces 17 to 23, and is composed of three negative lenses and one positive lens. The third lens group L3 is composed of surfaces 24 to 26, and is composed of one negative lens and one positive lens.

[0082] The aperture stop SP corresponds to surface No. 27. The fourth lens unit L4 is made up of surfaces No. 28 to No. 48, and is made up of five negative lenses and eight positive lenses.

[0083] 10 is a diagram showing aberrations of the zoom lens according to Example 5 when focused on an object at infinity and at (a) the wide-angle end and (b) the telephoto end (for the respective focal lengths, see Numerical Example 5). The legend is the same as that described with reference to FIG. 2.

[0084] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0085] 11 is a cross-sectional view of the zoom lens according to Example 6 when it is at the wide-angle end and focused on an object at infinity. The components of the zoom lens according to Example 6 will be described with reference to FIG.

[0086] The zoom lens according to Example 6 includes, in order from the object side to the image side, a first lens unit L1 with positive refractive power that does not move for zooming, two or more intermediate lens units (a second lens unit L2 with negative refractive power, a third lens unit L3 with negative refractive power, and a fourth lens unit L4 with positive refractive power) that move during zooming, and a fifth lens unit L5 as a rear lens unit with positive refractive power that does not move during zooming. In the zoom lens, the spacing between adjacent lens units all changes during zooming. An aperture stop SP is disposed adjacent to the image side of the fourth lens unit L4 and moves integrally with the fourth lens unit L4 during zooming.

[0087] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0088] The first sub-lens group L11 does not move for focusing, the second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object, and the third sub-lens group L13 does not move for focusing.

[0089] The two or more intermediate lens groups that move during zooming consist, in order from the object side to the image side, of a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power. The second lens group L2 moves monotonically along the optical axis toward the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves first toward the object side and then toward the image side when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves non-monotonically along the optical axis when zooming from the wide-angle end to the telephoto end (for example, non-monotonically as shown in the figure).

[0090] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0091] The second, third, and fourth lens groups, which are two or more intermediate lens groups, are composed of surfaces 19 to 34. The second lens group L2 is composed of surfaces 19 to 25 and consists of three negative lenses and one positive lens. The third lens group L3 is composed of surfaces 26 to 28 and consists of one negative lens and one positive lens. The fourth lens group L4 is composed of surfaces 29 to 33 and consists of one negative lens and two positive lenses.

[0092] The aperture stop SP corresponds to surface No. 34. The fifth lens unit L5 is made up of surfaces Nos. 35 to 50, and is made up of four negative lenses and six positive lenses. 12 is a diagram showing aberrations of the zoom lens according to Example 6 when focused on an object at infinity and at (a) the wide-angle end and (b) the telephoto end (for the respective focal lengths, see Numerical Example 6). The legend is the same as that described with reference to FIG. 2.

[0093] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0094] 13 is a cross-sectional view of the zoom lens according to Example 7 when it is at the wide-angle end and focused on an object at infinity. With reference to this figure, the components of the zoom lens will be described in order from the object side to the image side.

[0095] The zoom lens according to Example 7 includes, in order from the object side to the image side, a first lens group L1 with positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming (a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power), and a fifth lens group L5 as a rear lens group with positive refractive power that does not move for zooming. In the zoom lens, the distances between adjacent lens groups all change during zooming. An aperture stop SP is disposed between the fourth lens group L4 and the fifth lens group L5.

[0096] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0097] The first sub-lens group L11 does not move for focusing, the second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object, and the third sub-lens group L13 does not move for focusing.

[0098] The two or more intermediate lens groups that move during zooming are, in order from the object side to the image side, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power.

[0099] The second lens group L2 moves monotonically toward the image side on the optical axis for zooming from the wide-angle end to the telephoto end. The third lens group L3 moves first toward the object side and then toward the image side on the optical axis for zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves (e.g., non-monotonically as shown) on the optical axis for zooming from the wide-angle end to the telephoto end.

[0100] SP is an aperture stop that moves on the optical axis independently of the movement of the lens groups during zooming from the wide-angle end to the telephoto end. That is, the distance between the aperture stop SP and the fourth lens group L4 and the distance between the aperture stop SP and the fifth lens group L5 change during zooming.

[0101] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0102] The second lens group L2, the third lens group L3, and the fourth lens group L4, which are two or more intermediate lens groups, are composed of surfaces Nos. 19 to 34. The second lens group L2 is composed of surfaces Nos. 19 to 25 and consists of three negative lenses and one positive lens. The third lens group L3 is composed of surfaces Nos. 26 to 28 and consists of one negative lens and one positive lens. The fourth lens group L4 is composed of surfaces Nos. 29 to 33 and consists of one negative lens and two positive lenses.

[0103] The aperture stop SP corresponds to surface No. 34. The fifth lens unit L5 is made up of surfaces Nos. 35 to 50, and is made up of four negative lenses and six positive lenses. 14 is a diagram showing aberrations of the zoom lens according to Example 7 when focused on an object at infinity and at (a) the wide-angle end and (b) the telephoto end (for the respective focal lengths, see Numerical Example 7). The legend is the same as that described with reference to FIG. 2.

[0104] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. [Example]

[0105] 15 is a cross-sectional view of the zoom lens according to Example 8 when it is at the wide-angle end and focused on an object at infinity. With reference to this figure, the components of the zoom lens will be described in order from the object side to the image side.

[0106] The zoom lens according to Example 8 includes, in order from the object side to the image side, a first lens unit L1 with positive refractive power that does not move for zooming, two or more intermediate lens units that move during zooming (a second lens unit L2 with negative refractive power, a third lens unit L3 with negative refractive power, a fourth lens unit L4 with negative refractive power, and a fifth lens unit L5 with positive refractive power), and a sixth lens unit L6 as a rear lens unit with positive refractive power that does not move for zooming. In the zoom lens, the spacing between adjacent lens units all changes during zooming. An aperture stop SP is located on the object side of the sixth lens unit L6 and does not move for zooming.

[0107] The first lens group L1 has, in order from the object side to the image side, a first sub-lens group L11 with negative refractive power, a second sub-lens group L12 with positive refractive power, and a third sub-lens group L13 with positive refractive power.

[0108] The first sub-lens group L11 does not move for focusing, the second sub-lens group L12 moves toward the image side for focusing from an object at infinity to a close object, and the third sub-lens group L13 does not move for focusing.

[0109] The two or more intermediate lens groups that move during zooming consist, in order from the object side to the image side, of a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with negative refractive power, and a fifth lens group L5 with positive refractive power.

[0110] The second lens group L2 moves monotonically toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves monotonically toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves first toward the object side and then toward the image side on the optical axis when zooming from the wide-angle end to the telephoto end. The fifth lens group L5 moves (for example, non-monotonically as shown in the figure) on the optical axis when zooming from the wide-angle end to the telephoto end.

[0111] The first lens group L1 consists of surfaces 1 to 18. The first sub-lens group L11 consists of surfaces 1 to 6 and consists of two negative lenses and one positive lens. The second sub-lens group L12 consists of surfaces 7 and 8 and consists of one positive lens whose image-side surface is aspherical. The third sub-lens group L13 consists of surfaces 9 to 18 and consists of four positive lenses and two negative lenses.

[0112] The second lens group L2, the third lens group L3, the fourth lens group L4, and the fifth lens group L5, which are two or more intermediate lens groups, are each composed of surfaces 19 through 34. The second lens group L2 is composed of surfaces 19 through 23 and consists of two negative lenses and one positive lens. The third lens group L3 is composed of surfaces 24 through 25 and consists of one negative lens. The fourth lens group L4 is composed of surfaces 26 through 28 and consists of one negative lens and one positive lens. The fifth lens group L5 is composed of surfaces 29 through 33 and consists of one negative lens and two positive lenses. The aperture stop SP corresponds to surface 34. The sixth lens group L6 is composed of surfaces 35 through 50 and consists of four negative lenses and six positive lenses.

[0113] 16 is a diagram showing aberrations of the zoom lens according to Example 8 when focused on an object at infinity, at (a) the wide-angle end, and at (b) the telephoto end (for the respective focal lengths, see Numerical Example 6). The legend is the same as that described with reference to FIG. 2.

[0114] Values ​​according to conditional expressions (1) to (19) and the values ​​of the variables included in these conditional expressions are shown in Table 1. By satisfying the conditional expressions, the zoom lens according to this embodiment can provide a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance.

[0115] Although the rear lens group is not movable in Examples 1 to 8, it is possible to move the rear lens group or a portion thereof (a sub-lens group) for purposes such as aberration correction and focus adjustment. Even in this case, the above-described effects can be achieved, and such modifications are easily made by those skilled in the art. For example, in Example 1 (Numerical Example 1), the 41st to 50th surfaces of the rear lens group L5 may be movable. Because a substantially afocal light beam is incident on the 41st surface from the object side, even if this portion moves, the optical characteristics other than the back focus remain substantially unchanged. Therefore, this portion can be used as a sub-lens group that moves to compensate for changes in focus. The causes of changes in focus compensated for by the movement of the rear lens group or its sub-lens group may include, for example, at least one of manufacturing errors, temperature changes, and attitude changes of the zoom lens.

[0116] (imaging device) Next, with reference to FIG. 17, an imaging device (broadcast camera) using the zoom lens of each embodiment as an imaging optical system will be described. Fig. 17 is a diagram illustrating the configuration of an imaging device. In Fig. 17, 101 is a zoom lens according to any one of Examples 1 to 8. 124 is a camera body. The zoom lens 101 is detachable from the camera body 124. 125 is an imaging device configured by attaching the zoom lens 101 to the camera body 124. The zoom lens 101 has a first lens group F, a zoom section LZ, and imaging lens groups R1 and R2. The first lens group F includes a second sub-lens group L12 that moves during focusing, a first sub-lens group L11 that does not move during focusing, and a third sub-lens group L13.

[0117] The zoom section LZ includes lens groups that move during zooming. An aperture stop SP, lens group R1, and lens group R2 are arranged closer to the image side than the zoom section LZ. A removable lens unit IE is provided in the optical path between lens group R1 and lens group R2. By inserting the lens unit IE between lens group R1 and lens group R2, the focal length range of the entire zoom lens 101 is changed.

[0118] Reference numerals 114 and 115 denote driving mechanisms such as helicoids or cams that drive the first lens group F and the zoom portion LZ in the optical axis direction, respectively. Reference numerals 116 to 118 denote motors (driving means) that electrically drive the driving mechanisms 114 and 115 and the aperture stop SP.

[0119] Reference numerals 119 to 121 denote detectors such as encoders, potentiometers, or photosensors for detecting the positions of the first lens group F and the zoom portion LZ on the optical axis and the aperture diameter of the aperture diaphragm SP.

[0120] In the camera body 124, reference numeral 109 denotes a glass block corresponding to an optical filter or color separation optical system within the camera body 124, and reference numeral 110 denotes an imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor that receives the subject image formed by the zoom lens 101. Reference numerals 111 and 122 denote control units such as a CPU that control various driving operations of the camera body 124 and the zoom lens 101.

[0121] In this way, by using the zoom lens of each embodiment, it is possible to realize an imaging device with high optical performance.

[0122] The disclosure of this embodiment includes the following configuration. (Configuration 1) A zoom lens having, in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, two or more intermediate lens groups that move during zooming, and a rear lens group having positive refractive power, The spacing between adjacent lens groups changes during zooming. an aperture stop disposed in the rear lens group, in a lens group adjacent to the rear lens group, or between the rear lens group and a lens group adjacent to the rear lens group; the first lens group includes, in order from the object side to the image side, a first sub-lens group having negative refractive power that does not move for focusing, a second sub-lens group having positive refractive power that moves for focusing, and a third sub-lens group having positive refractive power; Let f1 be the focal length of the first lens group, bok1 be the length on the optical axis from the surface of the first lens group closest to the image side to the rear principal point of the first lens group, fw be the focal length of the zoom lens at the wide-angle end, and ft be the focal length of the zoom lens at the telephoto end, 1.700≦(f1+bok1) / f1≦2.200 1.50≦f1 / fw≦4.00 7.1≦ft / fw≦10.0 A zoom lens characterized by satisfying the following conditional expressions: (Configuration 2) 2.10≦ft / f1≦8.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied: (Configuration 3) The first lens group has a lens G1 with negative refractive power closest to the object, and the focal length of the lens G1 is fG1, -5.50≦fG1 / fw≦-1.60 3. The zoom lens according to configuration 1 or 2, wherein the following condition is satisfied: (Configuration 4) The first sub-lens group has a focal length of fGp, 5.80≦fGp / fw≦20.60 4. A zoom lens according to any one of configurations 1 to 3, comprising a lens Gp having a focal length fGp that satisfies the following condition: (Configuration 5) The first lens group has a lens G1 with negative refractive power closest to the object, and the focal length of the lens G1 is fG1, -2.10≦fG1 / f1≦-0.80 5. The zoom lens according to any one of configurations 1 to 4, wherein the following condition is satisfied: (Configuration 6) The focal length of the first sub-lens group is f11, -1.50≦f11 / f1≦-0.75 6. The zoom lens according to any one of configurations 1 to 5, wherein the following condition is satisfied: (Configuration 7) The focal length of the second sub-lens group is f12, 2.00≦f12 / f1≦4.40 7. The zoom lens according to any one of configurations 1 to 6, wherein the following condition is satisfied: (Configuration 8) The focal length of the third sub-lens group is f13, 1.30≦f13 / f1≦1.80 8. The zoom lens according to any one of configurations 1 to 7, wherein the following condition is satisfied: (Configuration 9) Let Fnow be the F-number of the zoom lens at the wide-angle end, 2.00≦Fnow≦3.50 9. A zoom lens according to any one of configurations 1 to 8, characterized in that the following conditional expression is satisfied: (Configuration 10) Let nd1n be the average value of the refractive indexes for the d-line of all the negative lenses included in the first lens group, 1.75≦nd1n≦2.00 10. The zoom lens according to any one of configurations 1 to 9, wherein the following condition is satisfied: (Configuration 11) The first sub-lens group has an Abbe number for the d-line of νd11p, 17.0≦νd11p≦25.0 11. A zoom lens according to any one of configurations 1 to 10, comprising a positive lens L11p having an Abbe number νd11p that satisfies the following condition: (Configuration 12) The third sub-lens group has an Abbe number for the d-line of νd13n, 20.0≦νd13n≦50.0 12. A zoom lens according to any one of configurations 1 to 11, comprising a negative lens L13n having an Abbe number νd13n that satisfies the following condition: (Configuration 13) The first sub-lens group and the third sub-lens group have an Abbe number for the d-line of νd11p and another Abbe number for the d-line of νd13n, 3.0≦νd13n-νd11p≦25.0 13. The zoom lens according to any one of configurations 1 to 12, comprising a positive lens L11p having an Abbe number νd11p that satisfies the following conditional expression, and a negative lens L13n having an Abbe number νd13n that satisfies the same conditional expression: (Configuration 14) The thickness of the first lens group on the optical axis is defined as LD1, 1.50≦LD1 / f1≦3.30 14. A zoom lens according to any one of configurations 1 to 13, characterized in that the following conditional expression is satisfied: (Configuration 15) 15. The zoom lens according to any one of configurations 1 to 14, wherein the third sub-lens group is made up of five or fewer lenses. (Configuration 16) Let BFw be the length on the optical axis from the image-side surface of the lens closest to the image side having a finite focal length in the zoom lens to the image plane, 0.280≦fw / BFw≦0.430 16. A zoom lens according to any one of configurations 1 to 15, characterized in that the following conditional expression is satisfied: (Configuration 17) a zoom lens according to any one of configurations 1 to 16; an image sensor that captures an image formed by the zoom lens; An imaging device comprising: (Configuration 18) The diagonal length of the image sensor is 2Y, and the half angle of view at the wide-angle end is ωw. The half angle of view ωw is expressed as follows: ωw=arctan(Y / fw) is defined by the formula 41.2°≦ωw≦50.0° 18. The imaging device according to configuration 17, wherein the following condition is satisfied: (Configuration 19) The diagonal length of the image sensor is 2Y, and the half angle of view at the telephoto end is ωt. The half angle of view ωt is expressed as follows: ωt=arctan(Y / ft) is defined by the formula 4.30°≦ωt≦8.25° 18. The imaging device according to configuration 17, wherein the following condition is satisfied:

[0123] 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 are possible within the scope of the gist of the present invention. Numerical details for each numerical example are shown below. In each numerical example, r is the radius of curvature of each surface, d is the surface spacing, nd or Nd is the absolute refractive index at 1 atmosphere for the d-line of the Fraunhofer line, and νd is the Abbe number based on the d-line. The "half angle of view" ω is expressed by the formula ω = arctan(Y / fw), where 2Y is the diagonal image size of a camera in which the zoom lens is used, and fw is the focal length of the zoom lens at the wide-angle end. The "maximum image height" corresponds to half Y (e.g., 14.80 mm) of the diagonal image size 2Y (e.g., 29.60 mm). BF is the back focus (air-equivalent length). The last three surfaces are surfaces of a glass block such as a filter. The refractive indices for the F-line, d-line, and C-line of the Fraunhofer line are NF, Nd, and NC, respectively, and the Abbe number νd is expressed by the formula νd=(Nd-1) / (NF-NC) It is expressed as follows. The shape of an aspherical surface is expressed by taking the X axis in the direction of the optical axis, the H axis in the direction perpendicular to the direction of the optical axis, and the direction of light travelling as positive. R is the paraxial radius of curvature, k is the conic constant, and A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, and A16 are the aspherical coefficients. Then, the shape of the aspherical surface (deviation from the reference spherical surface) is expressed by the following formula. Note that "eZ" is "×10 -Z ". Also, an "*" to the right of a surface number indicates that the surface is aspherical.

number

[0124] <Numerical Example 1> Unit: mm Surface Data Surface number rd nd vd θgf 1* 4757.030 2.80 1.80100 35.0 0.5864 2 43.063 27.48 3 -75.597 2.20 1.63854 55.4 0.5484 4 239.886 0.15 5 157.499 7.69 1.95906 17.5 0.6598 6 -383.207 1.13 7 200.472 13.03 1.53775 74.7 0.5392 8* -92.576 5.51 9 270.694 10.71 1.48749 70.2 0.5300 10 -95.188 2.10 1.84666 23.8 0.6205 11 -199.911 0.20 12 145.369 2.10 1.80518 25.4 0.6161 13 56.865 13.53 1.43875 94.7 0.5340 14 -1365.080 0.20 15 206.147 6.00 1.43387 95.1 0.5373 16 -334.432 0.20 17 186.419 8.81 1.76385 48.5 0.5589 18 -138.559 (variable) 19* 113.971 1.25 2.00100 29.1 0.5997 20 24.186 6.46 21 -41.222 0.90 1.59522 67.7 0.5442 22 30.642 6.03 1.85478 24.8 0.6122 23 -62.383 3.17 24 -25.353 0.90 1.83481 42.7 0.5648 25 -44.360 (variable) 26 -37.021 0.90 1.60300 65.4 0.5401 27 98.137 2.03 1.85478 24.8 0.6122 28 728.324 (variable) 29* 70.998 6.13 1.90525 35.0 0.5848 30 -103.934 0.20 31 -315.843 1.20 1.95375 32.3 0.5905 32 166.347 3.47 1.61800 63.3 0.5441 33 -137.368 (variable) 34 (Aperture) ∞ 1.80 35 168.020 1.80 2.00100 29.1 0.5997 36 49.624 8.61 1.49700 81.5 0.5375 37 -58.231 0.20 38 88.195 6.21 1.51633 64.1 0.5353 39 -53.581 2.00 1.83481 42.7 0.5648 40 243.630 41.99 41 64.451 8.16 1.43875 94.7 0.5340 42 -49.102 4.20 43 255.432 7.95 1.80810 22.8 0.6307 44 -35.562 1.10 2.00100 29.1 0.5997 45 -1466.352 1.00 46 161.235 10.33 1.51742 52.4 0.5564 47 -26.752 1.20 1.89190 37.1 0.5780 48 51.269 0.72 49 37.558 10.15 1.48749 70.2 0.5300 50 -58.875 42.54 Image plane ∞ Aspheric data Front page K =-2.00000e+00 A 4= 9.46087e-07 A 6= 1.98046e-09 A 8= 6.52397e-12 A10= 8.28901e-15 A12=-1.35643e-19 A14=-1.86398e-21 A16=-5.54763e-26 A 3=-1.81264e-06 A 5=-2.33898e-08 A 7=-1.25328e-10 A 9=-2.69889e-13 A11=-1.52146e-16 A13= 8.26328e-20 A15= 1.72135e-23 Side 8 K =-1.02997e+00 A 4= 5.48630e-07 A 6= 2.34979e-10 A 8=-1.89359e-15 A10=-6.91188e-16 A12=-7.25113e-20 A 3=-3.10939e-07 A 5=-1.89555e-09 A 7=-1.00407e-11 A 9= 1.71125e-14 A11= 1.12862e-17 Page 19 K =-2.00013e+00 A 4= 4.92053e-06 A 6=-5.35701e-08 A 8=-2.79944e-09 A10=-1.33097e-11 A12=-3.74615e-15 A 3=-1.29064e-06 A 5=-9.34903e-08 A 7= 1.78894e-08 A 9= 2.53904e-10 A11= 3.63938e-13 Page 29 K = 8.99851e-01 A 4=-2.76907e-06 A 6=-1.06240e-07 A 8=-2.88426e-09 A10=-1.28512e-11 A12= 1.83249e-15 A14= 1.77924e-17 A16= 3.66574e-21 A 3=-3.97104e-07 A 5= 2.76818e-07 A 7= 2.21858e-08 A 9= 2.43469e-10 A11= 3.46270e-13 A13=-4.90518e-16 A15=-3.48843e-19 Various data Zoom ratio 7.79 Wide-angle Mid-range Telephoto Focal length 15.40 45.00 120.00 F-number 2.72 2.71 3.65 Half angle of view 43.86 18.21 7.03 Image height 14.80 14.80 14.80 Lens total length 347.55 347.55 347.55 BF 42.54 42.54 42.54 d18 1.15 37.22 55.04 d25 39.95 4.59 3.36 d28 10.52 14.59 0.79 d33 9.50 4.72 1.92 Zoom lens group data Group starting plane focal length 1 1 46.81 2 19 -24.89 3 26 -67.11 4 29 49.01 5 34 96.11

[0125] <Numerical Example 2> Unit: mm Surface Data Surface number rd nd vd θgf 1* -97517.603 2.80 1.79360 37.1 0.5828 2 47.565 28.34 3 -91.172 2.20 1.64000 60.1 0.5370 4 231.205 0.15 5 159.057 8.00 1.95906 17.5 0.6598 6 -563.831 1.13 7 193.066 13.74 1.49700 81.5 0.5375 8* -99.305 7.09 9 492.040 9.42 1.48749 70.2 0.5300 10 -138.765 2.10 1.84666 23.8 0.6205 11 -181.879 0.20 12 311.431 2.10 1.84666 23.8 0.6205 13 61.101 16.86 1.49700 81.5 0.5375 14 -674.762 0.20 15 179.867 8.46 1.43875 94.7 0.5340 16 -264.733 0.20 17 140.768 12.00 1.76385 48.5 0.5589 18 -157.528 (variable) 19* 149.683 1.25 2.00100 29.1 0.5997 20 25.187 8.26 21 -35.252 0.90 1.59522 67.7 0.5442 22 36.531 5.98 1.85478 24.8 0.6122 23 -47.432 2.57 24 -26.833 0.90 1.83481 42.7 0.5648 25 -52.895 (variable) 26 -37.409 0.90 1.60300 65.4 0.5401 27 84.844 2.15 1.85478 24.8 0.6122 28 595.765 (variable) 29* 56.893 7.06 1.90525 35.0 0.5848 30 -126.351 0.20 31 268.076 1.20 1.95375 32.3 0.5905 32 49.468 6.24 1.61800 63.3 0.5441 33 558.749 (variable) 34 (Aperture) ∞ 1.50 35 198.423 1.77 2.00100 29.1 0.5997 36 60.471 7.34 1.49700 81.5 0.5375 37 -60.090 0.95 38 98.790 11.42 1.51633 64.1 0.5353 39 -47.588 1.38 1.83481 42.7 0.5648 40 395.221 39.57 41 58.875 10.70 1.43875 94.7 0.5340 42 -48.447 4.20 43 162.348 9.03 1.80810 22.8 0.6307 44 -31.389 1.10 2.00100 29.1 0.5997 45 377.292 1.00 46 227.074 8.02 1.51742 52.4 0.5564 47 -24.601 1.20 1.89190 37.1 0.5780 48 64.373 0.19 49 37.901 11.05 1.48749 70.2 0.5300 50 -58.875 40.00 Image plane ∞ Aspheric data Front page K = 4.00308e+06 A 4= 7.13698e-07 A 6= 2.27291e-09 A 8= 6.70852e-12 A10= 8.24557e-15 A12=-1.34492e-19 A14=-1.85709e-21 A16=-5.75372e-26 A 3=-1.64166e-06 A 5=-2.79170e-08 A 7=-1.34591e-10 A 9=-2.69292e-13 A11=-1.52847e-16 A13= 8.28073e-20 A15= 1.72194e-23 Side 8 K = 8.02218e-02 A 4= 7.23021e-07 A 6= 2.04129e-10 A 8=-2.81197e-13 A10=-1.36597e-15 A12=-1.36816e-19 A 3=-2.46466e-07 A 5=-1.41861e-09 A 7=-7.93646e-12 A 9= 3.74398e-14 A11= 2.19377e-17 Page 19 K =-6.29688e+01 A 4= 6.50455e-06 A 6=-4.76913e-08 A 8=-2.45525e-09 A10=-1.48055e-11 A12=-4.95311e-15 A 3= 3.12266e-07 A 5= 3.50879e-08 A 7= 1.35743e-08 A 9= 2.55951e-10 A11= 4.36524e-13 Page 29 K = 3.80324e-02 A 4=-2.71715e-06 A 6=-1.13699e-07 A 8=-2.91756e-09 A10=-1.28417e-11 A12= 1.78390e-15 A14= 1.78561e-17 A16= 2.71927e-21 A 3=-4.69498e-07 A 5= 2.97582e-07 A 7= 2.30589e-08 A 9= 2.42840e-10 A11= 3.51459e-13 A13=-5.03975e-16 A15=-3.14802e-19 Various data Zoom ratio 8.63 Wide-angle Mid-range Telephoto Focal length 15.65 46.99 135.01 F-number 2.72 2.71 3.65 Half angle of view 43.40 17.48 6.26 Image height 14.80 14.80 14.80 Lens total length 364.68 364.68 364.68 BF 40.00 40.00 40.00 d18 1.40 35.29 52.03 d25 35.74 1.30 3.63 d28 15.18 18.87 0.80 d33 9.36 6.21 5.20 Zoom lens group data Group starting plane focal length 1 1 44.88 2 19 -24.14 3 26 -68.52 4 29 53.18 5 34 95.74

[0126] <Numerical Example 3> Unit: mm Surface Data Surface number rd nd vd θgf 1* 4757.030 2.80 1.80100 35.0 0.5864 2 43.063 27.48 3 -75.597 2.20 1.63854 55.4 0.5484 4 279.965 0.15 5 163.987 7.69 1.95906 17.5 0.6598 6 -320.772 1.13 7 190.118 13.03 1.53775 74.7 0.5392 8* -98.840 5.51 9 401.642 10.71 1.48749 70.2 0.5300 10 -90.800 2.10 1.84666 23.8 0.6205 11 -171.934 0.20 12 182.750 2.10 1.80518 25.4 0.6161 13 57.726 13.53 1.43875 94.7 0.5340 14 -770.935 0.20 15 159.541 6.00 1.43387 95.1 0.5373 16 -453.397 0.20 17 185.323 8.81 1.76385 48.5 0.5589 18 -132.294 (variable) 19* 113.971 1.25 2.00100 29.1 0.5997 20 24.186 6.46 21 -41.222 0.90 1.59522 67.7 0.5442 22 30.642 6.03 1.85478 24.8 0.6122 23 -62.383 3.17 24 -25.353 0.90 1.83481 42.7 0.5648 25 -44.360 (variable) 26 -38.406 0.90 1.53775 74.7 0.5392 27 127.237 2.68 1.85478 24.8 0.6122 28 667.742 (variable) 29* 66.593 6.13 1.90525 35.0 0.5848 30 -64.439 0.20 31 -78.104 1.20 1.95375 32.3 0.5905 32 1444.439 3.47 1.61800 63.3 0.5441 33 -154.076 1.00 34 (Aperture) ∞ (Variable) 35 168.020 1.80 2.00100 29.1 0.5997 36 49.624 8.61 1.49700 81.5 0.5375 37 -58.231 0.20 38 88.195 6.21 1.51633 64.1 0.5353 39 -53.581 2.00 1.83481 42.7 0.5648 40 243.630 41.99 41 61.033 9.38 1.43875 94.7 0.5340 42 -50.126 4.20 43 255.432 7.95 1.80810 22.8 0.6307 44 -35.562 1.10 2.00100 29.1 0.5997 45 -1466.352 1.00 46 161.235 10.33 1.51742 52.4 0.5564 47 -26.752 1.20 1.89190 37.1 0.5780 48 51.269 0.72 49 37.558 10.15 1.48749 70.2 0.5300 50 -58.875 42.87 Image plane ∞ Aspheric data Front page K = -2.00000e+00 A4 = 9.46087e-07 A6 = 1.98046e-09 A8 = 6.52397e-12 A10 = 8.28901e-15 A12 = -1.35643e-19 A14 = -1.86398e-21 A16 = -5.54763e-26 A3 = -1.81264e-06 A5 = -2.33898e-08 A7 = -1.25328e-10 A9 = -2.69889e-13 A11 = -1.52146e-16 A13 = 8.26328e-20 A15 = 1.72135e-23 The 8th face K = -1.73472e+00 A4 = 1.56357e-07 A6 = -4.81413e-09 A8 = -4.53396e-12 A10 = 2.15972e-15 A12 = -1.64695e-18 A14 = 1.73307e-21 A3 = 7.34189e-07 A5 = 5.71705e-08 A7 = 2.24211e-10 A9 = -3.49507e-14 A11 = 4.18420e-17 A13 = -3.72718e-20 A15 = -1.61616e-23 The 19th face K = -2.00013e+00 A4 = 4.92053e-06 A6 = -5.35701e-08 A8 = -2.79944e-09 A10 = -1.33097e-11 A12 = -3.74615e-15 A3 = -1.29064e-06 A5 = -9.34903e-08 A7 = 1.78894e-08 A9 = 2.53904e-10 A11 = 3.63938e-13 The 29th face K = 6.86656e+00 A4 = -5.52331e-06 A6 = -7.98772e-08 A8 = -2.64295e-09 A10 = -1.35601e-11 A12 = 3.38220e-15 A14 = 1.09085e-17 A16 = 3.66574e-21 A 3= 3.56173e-07 A 5= 2.12892e-07 A 7= 1.78300e-08 A 9= 2.46522e-10 A11= 3.40292e-13 A13=-4.30457e-16 A15=-2.11316e-19 Various data Zoom ratio 7.79 Wide-angle Mid-range Telephoto Focal length 15.40 44.77 120.00 F-number 2.72 2.71 3.65 Half angle of view 43.86 18.29 7.03 Image height 14.80 14.80 14.80 Lens total length 350.30 350.30 350.30 BF 42.87 42.87 42.87 d18 1.15 37.22 55.04 d25 39.95 3.54 5.01 d28 11.07 16.19 -0.30 d34 10.30 5.52 2.72 Zoom lens group data Group starting plane focal length 1 1 46.70 2 19 -24.89 3 26 -78.12 4 29 53.07 5 35 94.48

[0127] <Numerical Example 4> Unit: mm Surface Data Surface number rd nd vd θgf 1* 4757.030 2.80 1.80100 35.0 0.5864 2 43.063 27.48 3 -75.597 2.20 1.63854 55.4 0.5484 4 207.466 0.15 5 142.462 7.69 1.95906 17.5 0.6598 6 -383.425 1.13 7 341.901 13.03 1.53775 74.7 0.5392 8* -82.708 5.51 9 838.984 10.71 1.48749 70.2 0.5300 10 -74.224 2.10 1.84666 23.8 0.6205 11 -179.753 0.20 12 118.820 2.10 1.80518 25.4 0.6161 13 58.210 13.53 1.43875 94.7 0.5340 14 -1777.795 0.20 15 522.808 6.00 1.43387 95.1 0.5373 16 -173.912 0.20 17 176.805 8.81 1.76385 48.5 0.5589 18 -142.630 (variable) 19* 113.971 1.25 2.00100 29.1 0.5997 20 24.186 6.46 21 -41.222 0.90 1.59522 67.7 0.5442 22 30.642 6.03 1.85478 24.8 0.6122 23 -62.383 (variable) 24 -25.353 0.90 1.83481 42.7 0.5648 25 -44.360 (variable) 26 -38.404 0.90 1.49700 81.6 0.5320 27 -125.456 1.75 1.85478 24.8 0.6122 28 -76.241 0.50 29 -62.839 0.60 1.51633 64.1 0.5353 30 -294.929 (variable) 31* 63.384 6.13 1.90525 35.0 0.5848 32 -120.998 0.20 33 122.127 1.20 1.95375 32.3 0.5905 34 55.181 3.47 1.61800 63.3 0.5441 35 117.100 (variable) 36 (Aperture) ∞ 1.80 37 168.020 1.80 2.00100 29.1 0.5997 38 49.624 8.61 1.49700 81.5 0.5375 39 -58.231 0.20 40 88.195 6.21 1.51633 64.1 0.5353 41 -53.581 2.00 1.83481 42.7 0.5648 42 243.630 41.99 43 64.654 12.08 1.43875 94.7 0.5340 44 -49.392 4.20 45 255.432 7.95 1.80810 22.8 0.6307 46 -35.562 1.10 2.00100 29.1 0.5997 47 -1466.352 1.00 48 161.235 10.33 1.51742 52.4 0.5564 49 -26.752 1.20 1.89190 37.1 0.5780 50 51.269 0.72 51 37.558 10.15 1.48749 70.2 0.5300 52 -58.875 42.76 Image plane ∞ Aspheric data Page 1 K =-2.00000e+00 A 4= 9.46087e-07 A 6= 1.98046e-09 A 8= 6.52397e-12 A10= 8.28901e-15 A12=-1.35643e-19 A14=-1.86398e-21 A16=-5.54763e-26 A 3=-1.81264e-06 A 5=-2.33898e-08 A 7=-1.25328e-10 A 9=-2.69889e-13 A11=-1.52146e-16 A13= 8.26328e-20 A15= 1.72135e-23 Page 8 K =-9.93582e-01 A 4= 5.18140e-07 A 6= 2.32819e-09 A 8= 3.16726e-12 A10=-3.24978e-15 A12= 2.63264e-18 A14= 3.54338e-22 A 3=-3.53879e-07 A 5=-2.02687e-08 A 7=-1.31804e-10 A 9= 3.30800e-14 A11= 1.39091e-17 A13=-6.56226e-20 A15= 2.92112e-24 Page 19 K =-2.00013e+00 A 4= 4.92053e-06 A 6=-5.35701e-08 A 8=-2.79944e-09 A10=-1.33097e-11 A12=-3.74615e-15 A 3=-1.29064e-06 A 5=-9.34903e-08 A 7= 1.78894e-08 A 9= 2.53904e-10 A11= 3.63938e-13 Page 31 K =-3.33567e+00 A 4=-4.51545e-06 A 6=-2.93371e-07 A 8=-3.45335e-09 A10=-1.15898e-11 A12=-4.11734e-16 A14= 2.51975e-17 A16= 3.66574e-21 A 3= 5.10612e-06 A 5= 1.44917e-06 A 7= 3.81614e-08 A 9= 2.31795e-10 A11= 3.62158e-13 A13=-5.59857e-16 A15=-4.87822e-19 Various data Zoom ratio 7.62 Wide-angle Mid-range Telephoto Focal length 15.40 44.39 117.40 F-number 2.72 2.71 3.65 Half angle of view 43.86 18.44 7.19 Image height 14.80 14.80 14.80 Lens total length 357.38 357.38 357.38 BF 42.76 42.76 42.76 d18 1.15 38.69 57.23 d23 3.27 4.09 4.50 d25 46.65 5.36 5.00 d30 8.58 16.29 0.50 d35 9.50 4.72 1.92 Zoom lens group data Group starting plane focal length 1 1 47.41 2 19 -48.32 3 24 -72.44 4 26 -91.18 5 31 54.03 6 36 97.26

[0128] <Numerical Example 5> Unit: mm Surface Data Surface number rd nd vd θgf 1* -92919.747 2.80 1.79360 37.1 0.5828 2 46.213 31.28 3 -80.185 2.20 1.64000 60.1 0.5370 4 405.904 0.15 5 173.393 9.60 1.95906 17.5 0.6598 6 -773.241 1.13 7 172.093 19.91 1.49700 81.5 0.5375 8* -78.558 10.00 9 123.276 14.37 1.48749 70.2 0.5300 10 -95.930 2.10 1.84666 23.8 0.6205 11 -619.664 0.20 12 206.684 2.10 1.83400 37.2 0.5776 13 60.426 19.56 1.49700 81.5 0.5375 14 -122.636 0.20 15 104.587 9.94 1.76385 48.5 0.5589 16 -280.164 (variable) 17* 92.902 1.25 2.00100 29.1 0.5997 18 24.609 9.48 19 -31.994 0.90 1.59522 67.7 0.5442 20 36.193 8.16 1.85478 24.8 0.6122 21 -48.866 2.99 22 -24.869 0.90 1.83481 42.7 0.5648 23 -48.330 (variable) 24 -40.414 0.90 1.60300 65.4 0.5401 25 110.404 3.63 1.85478 24.8 0.6122 26 -14128.833 (variable) 27 (Aperture) ∞ 0.50 28* 54.485 9.23 1.90525 35.0 0.5848 29 -154.589 0.20 30 100.561 1.20 1.95375 32.3 0.5905 31 52.020 5.42 1.61800 63.3 0.5441 32 182.937 1.50 33 187.161 1.20 2.00100 29.1 0.5997 34 43.575 8.14 1.49700 81.5 0.5375 35 -67.084 0.20 36 481.309 5.40 1.51633 64.1 0.5353 37 -45.307 1.10 1.83481 42.7 0.5648 38 -493.901 41.51 39 64.427 8.29 1.43875 94.7 0.5340 40 -48.192 4.20 41 114.073 7.27 1.80810 22.8 0.6307 42 -35.273 1.10 2.00100 29.1 0.5997 43 143.661 1.00 44 108.863 8.74 1.51742 52.4 0.5564 45 -24.659 1.20 1.89190 37.1 0.5780 46 57.755 0.20 47 37.405 11.11 1.48749 70.2 0.5300 48 -58.875 42.94 Image plane ∞ Aspheric data Front page K = 3.46751e+06 A 4= 8.62280e-07 A 6= 2.48788e-09 A 8= 6.95151e-12 A10= 8.28791e-15 A12=-1.43312e-19 A14=-1.84997e-21 A16=-5.76677e-26 A 3=-1.85081e-06 A 5=-3.36003e-08 A 7=-1.43335e-10 A 9=-2.72926e-13 A11=-1.53480e-16 A13= 8.29901e-20 A15= 1.71165e-23 Page 8 K = 6.25317e-02 A 4= 6.87046e-07 A 6= 1.43125e-10 A 8=-5.94175e-13 A10=-1.43053e-15 A12=-1.27881e-19 A 3=-3.17271e-07 A 5=-2.26600e-09 A 7=-2.96547e-13 A 9= 4.40694e-14 A11= 2.17723e-17 Page 17 K =-2.05119e+01 A 4= 7.57415e-06 A 6=-5.34569e-08 A 8=-2.44195e-09 A10=-1.54366e-11 A12=-5.17011e-15 A 3=-3.02380e-07 A 5= 1.19870e-07 A 7= 1.34864e-08 A 9= 2.61585e-10 A11= 4.59275e-13 Page 28 K =-5.48566e-01 A 4=-2.15123e-06 A 6=-1.22194e-07 A 8=-2.95187e-09 A10=-1.28067e-11 A12= 1.70021e-15 A14= 1.75859e-17 A16= 2.66443e-21 A 3=-5.74786e-07 A 5= 3.37741e-07 A 7= 2.38781e-08 A 9= 2.43059e-10 A11= 3.50023e-13 A13=-4.93893e-16 A15=-3.12553e-19 Various data Zoom ratio 8.06 Wide-angle Mid-range Telephoto Focal length 15.50 45.43 125.00 F-number 2.72 2.72 3.65 Half angle of view 43.68 18.04 6.75 Image height 14.80 14.80 14.80 Lens total length 368.92 368.92 368.92 BF 42.94 42.94 42.94 d16 1.15 32.05 47.32 d23 36.78 1.30 5.41 d26 15.60 20.18 0.80 Zoom lens group data Group starting plane focal length 1 1 41.79 2 17 -23.55 3 24 -79.63 4 27 52.22

[0129] <Numerical Example 6> Unit: mm Surface Data Surface number rd nd vd θgf 1* -89413.671 2.80 1.79360 37.1 0.5828 2 43.169 29.32 3 -85.464 2.20 1.64000 60.1 0.5370 4 207.517 0.15 5 149.813 8.99 1.92286 18.9 0.6495 6 -350.031 1.13 7 188.369 13.87 1.49700 81.5 0.5375 8* -94.494 10.34 9 328.251 9.69 1.48749 70.2 0.5300 10 -147.291 2.10 1.84666 23.8 0.6205 11 -183.332 0.20 12 359.780 2.10 1.84666 23.8 0.6205 13 59.688 13.61 1.49700 81.5 0.5375 14 -470.525 0.20 15 187.907 9.01 1.43875 94.7 0.5340 16 -183.294 2.00 17 137.951 10.99 1.76385 48.5 0.5589 18 -164.814 (variable) 19* 111.441 1.25 2.00100 29.1 0.5997 20 24.326 6.93 21 -36.958 0.90 1.59522 67.7 0.5442 22 30.033 8.62 1.85478 24.8 0.6122 23 -52.167 3.60 24 -26.178 0.90 1.83481 42.7 0.5648 25 -62.620 (variable) 26 -37.952 0.90 1.60300 65.4 0.5401 27 102.754 2.05 1.85478 24.8 0.6122 28 3587.812 (variable) 29* 57.540 8.76 1.90525 35.0 0.5848 30 -123.886 0.20 31 717.433 1.20 1.95375 32.3 0.5905 32 62.604 5.99 1.61800 63.3 0.5441 33 -441.313 3.00 34 (Aperture) ∞ (Variable) 35 165.568 1.80 2.00100 29.1 0.5997 36 54.607 7.28 1.49700 81.5 0.5375 37 -61.491 0.90 38 102.223 9.26 1.51633 64.1 0.5353 39 -44.173 1.11 1.83481 42.7 0.5648 40 287.865 37.96 41 57.232 10.58 1.43875 94.7 0.5340 42 -48.113 4.16 43 157.256 8.88 1.80810 22.8 0.6307 44 -30.967 1.10 2.00100 29.1 0.5997 45 451.915 1.00 46 176.815 8.41 1.51742 52.4 0.5564 47 -25.166 1.20 1.89190 37.1 0.5780 48 58.270 0.91 49 37.662 11.12 1.48749 70.2 0.5300 50 -58.875 40.24 Image plane ∞ Aspheric data Front page K = 3.46351e+06 A 4= 8.89298e-07 A 6= 2.22014e-09 A 8= 6.64596e-12 A10= 8.25887e-15 A12=-1.29611e-19 A14=-1.86084e-21 A16=-5.65689e-26 A 3=-1.04177e-06 A 5=-2.67053e-08 A 7=-1.32296e-10 A 9=-2.69735e-13 A11=-1.52521e-16 A13= 8.27153e-20 A15= 1.72111e-23 Side 8 K =-4.11347e-01 A 4= 7.73068e-07 A 6= 1.98062e-10 A 8=-3.68208e-13 A10=-1.32661e-15 A12=-1.29935e-19 A 3= 7.84263e-08 A 5=-1.05783e-09 A 7=-7.44048e-12 A 9= 3.86879e-14 A11= 2.08018e-17 Page 19 K =-1.63671e+01 A 4= 5.01302e-06 A 6=-4.33711e-08 A 8=-2.43207e-09 A10=-1.48570e-11 A12=-4.67044e-15 A 3= 3.47434e-07 A 5= 4.42491e-08 A 7= 1.34016e-08 A 9= 2.54880e-10 A11= 4.35183e-13 Page 29 K =-5.68897e-01 A 4=-2.11632e-06 A 6=-1.12321e-07 A 8=-2.93486e-09 A10=-1.28336e-11 A12= 1.89637e-15 A14= 1.73771e-17 A16= 2.45582e-21 A 3=-9.14979e-07 A 5= 2.56470e-07 A 7= 2.32919e-08 A 9= 2.42773e-10 A11= 3.52411e-13 A13=-5.09488e-16 A15=-2.88355e-19 Various data Zoom ratio 7.38 Focal length 15.83 43.95 116.78 F-number 2.72 2.72 3.65 Half angle of view 43.07 18.61 7.22 Image height 14.80 14.80 14.80 Lens total length 360.75 360.75 360.75 BF 40.24 40.24 40.24 d18 1.50 29.82 43.81 d25 32.90 4.07 3.25 d28 13.46 16.48 0.80 d34 4.00 1.49 4.00 Zoom lens group data Group starting plane focal length 1 1 39.01 2 19 -22.42 3 26 -73.20 4 29 49.90 5 35 99.64

[0130] <Numerical Example 7> Unit: mm Surface Data Surface number rd nd vd θgf 1* 802.648 2.80 1.80100 35.0 0.5864 2 42.334 28.82 3 -70.803 2.20 1.63854 55.4 0.5484 4 253.576 0.15 5 162.711 7.81 1.95906 17.5 0.6598 6 -378.441 1.38 7 193.823 15.69 1.53775 74.7 0.5392 8* -92.436 6.03 9 331.302 11.96 1.48749 70.2 0.5300 10 -88.518 2.10 1.84666 23.8 0.6205 11 -167.390 0.20 12 129.429 2.10 1.80518 25.4 0.6161 13 56.391 11.08 1.43875 94.7 0.5340 14 282.158 0.20 15 164.743 7.14 1.43387 95.1 0.5373 16 -264.424 0.20 17 216.988 8.39 1.76385 48.5 0.5589 18 -139.131 (variable) 19* 67.940 1.25 2.00100 29.1 0.5997 20 23.570 7.12 21 -41.938 0.90 1.59522 67.7 0.5442 22 29.876 5.75 1.85478 24.8 0.6122 23 -80.323 2.45 24 -25.598 0.90 1.83481 42.7 0.5648 25 -44.148 (variable) 26 -38.333 0.90 1.60300 65.4 0.5401 27 110.410 3.01 1.85478 24.8 0.6122 28 1191.968 (variable) 29* 72.032 5.30 1.90525 35.0 0.5848 30 -145.830 0.20 31 -314.945 1.20 1.95375 32.3 0.5905 32 447.811 3.56 1.61800 63.3 0.5441 33 -111.378 (variable) 34 (Aperture) ∞ (Variable) 35 167.521 1.10 2.00100 29.1 0.5997 36 47.984 8.31 1.49700 81.5 0.5375 37 -65.103 0.57 38 97.838 6.56 1.51633 64.1 0.5353 39 -51.367 1.10 1.83481 42.7 0.5648 40 520.552 46.29 41 71.881 8.00 1.43875 94.7 0.5340 42 -50.471 4.20 43 109.502 9.45 1.80810 22.8 0.6307 44 -37.460 1.10 2.00100 29.1 0.5997 45 116.922 0.99 46 86.066 11.09 1.51742 52.4 0.5564 47 -25.435 1.20 1.89190 37.1 0.5780 48 52.611 1.94 49 39.946 8.80 1.48749 70.2 0.5300 50 -50.176 40.10 Image plane ∞ Aspheric data Front page K =-1.07693e+03 A 4= 1.12115e-06 A 6= 1.91940e-09 A 8= 6.59131e-12 A10= 8.27377e-15 A12=-1.35783e-19 A14=-1.86448e-21 A16=-5.53455e-26 A 3=-1.50134e-06 A 5=-2.59911e-08 A 7=-1.25281e-10 A 9=-2.69925e-13 A11=-1.52237e-16 A13= 8.26987e-20 A15= 1.72102e-23 Side 8 K =-5.61776e-01 A 4= 6.01042e-07 A 6= 4.01879e-10 A 8= 2.18544e-13 A10=-8.57671e-16 A12=-1.01545e-19 A 3=-2.02504e-07 A 5=-3.58450e-09 A 7=-1.86015e-11 A 9= 1.73697e-14 A11= 1.51797e-17 Page 19 K =-2.92314e+00 A 4= 5.28329e-06 A 6=-5.13287e-08 A 8=-2.68675e-09 A10=-1.33504e-11 A12=-3.61948e-15 A 3=-2.04612e-06 A 5=-8.07752e-08 A 7= 1.71289e-08 A 9= 2.48784e-10 A11= 3.67585e-13 Page 29 K = 1.85043e+00 A 4=-2.62570e-06 A 6=-1.00120e-07 A 8=-2.83515e-09 A10=-1.28862e-11 A12= 1.83187e-15 A14= 1.77472e-17 A16= 3.41386e-21 A 3= 7.03908e-08 A 5= 2.56255e-07 A 7= 2.14014e-08 A 9= 2.42290e-10 A11= 3.48440e-13 A13=-4.91305e-16 A15=-3.42057e-19 Various data Zoom ratio 7.47 Wide-angle Mid-range Telephoto Focal length 15.91 45.76 118.84 F-number 2.72 2.72 3.65 Half angle of view 42.93 17.92 7.10 Image height 14.80 14.80 14.80 Lens total length 356.08 356.08 356.08 d18 1.50 38.75 57.16 d25 44.44 6.63 2.19 d28 11.81 16.16 2.81 d33 4.71 0.59 0.50 d34 2.00 2.34 1.81 Zoom lens group data Group starting plane focal length 1 1 48.43 2 19 -26.49 3 26 -70.58 4 29 49.92 34∞ 5 35 109.30

[0131] <Numerical Example 8> Unit: mm Surface Data Surface number rd nd vd θgf 1* 31009.925 2.80 1.80100 35.0 0.5864 2 43.248 28.09 3 -75.259 2.20 1.65160 58.5 0.5390 4 319.253 0.15 5 168.188 8.84 1.89286 20.4 0.6393 6 -235.321 1.13 7 154.953 13.15 1.53775 74.7 0.5392 8* -104.494 6.03 9 962.112 7.69 1.43875 94.7 0.5340 10 -112.855 2.10 1.85478 24.8 0.6122 11 -195.432 0.20 12 149.662 2.10 1.80518 25.4 0.6161 13 56.047 15.24 1.43875 94.7 0.5340 14 -595.811 0.52 15 189.224 6.89 1.43387 95.1 0.5373 16 -418.849 0.20 17 177.934 8.70 1.76385 48.5 0.5589 18 -146.341 (variable) 19* 118.284 1.25 2.00100 29.1 0.5997 20 24.302 6.57 21 -38.096 0.90 1.59522 67.7 0.5442 22 32.271 5.94 1.85478 24.8 0.6122 23 -59.594 (variable) 24 -24.804 0.90 1.83481 42.7 0.5648 25 -39.952 (variable) 26 -36.316 0.90 1.60300 65.4 0.5401 27 89.118 2.11 1.85478 24.8 0.6122 28 547.801 (variable) 29* 68.309 6.83 1.90525 35.0 0.5848 30 -112.002 0.20 31 -525.814 1.20 1.95375 32.3 0.5905 32 130.251 3.66 1.61800 63.3 0.5441 33 -160.400 (variable) 34 (Aperture) ∞ 1.80 35 177.658 1.80 2.00100 29.1 0.5997 36 51.018 11.07 1.49700 81.5 0.5375 37 -59.460 0.20 38 100.498 9.14 1.51633 64.1 0.5353 39 -50.019 1.10 1.83481 42.7 0.5648 40 674.822 41.24 41 64.337 8.11 1.43875 94.7 0.5340 42 -48.022 2.73 43 273.905 8.80 1.80810 22.8 0.6307 44 -35.243 1.10 2.00100 29.1 0.5997 45 -1291.761 0.71 46 211.047 8.98 1.51742 52.4 0.5564 47 -26.335 1.20 1.89190 37.1 0.5780 48 52.567 0.41 49 37.385 11.11 1.48749 70.2 0.5300 50 -58.875 42.99 Image plane ∞ Aspheric data Front page K = 3.99787e+05 A 4= 1.03414e-06 A 6= 1.93082e-09 A 8= 6.60034e-12 A10= 8.26805e-15 A12=-1.38059e-19 A14=-1.86068e-21 A16=-5.61800e-26 A 3=-1.66838e-06 A 5=-2.38278e-08 A 7=-1.27098e-10 A 9=-2.69268e-13 A11=-1.52572e-16 A13= 8.28003e-20 A15= 1.71920e-23 Side 8 K =-1.20590e+00 A 4= 6.04613e-07 A 6= 1.30338e-10 A 8=-2.17710e-13 A10=-6.40065e-16 A12=-5.65209e-20 A 3=-2.75867e-07 A 5=-1.66535e-09 A 7=-4.31108e-12 A 9= 1.98180e-14 A11= 9.48792e-18 Page 19 K = 7.21080e+00 A 4= 4.55833e-06 A 6=-5.10680e-08 A 8=-2.79624e-09 A10=-1.33211e-11 A12=-3.83738e-15 A 3=-1.52940e-06 A 5=-1.24957e-07 A 7= 1.78561e-08 A 9= 2.53114e-10 A11= 3.67957e-13 Page 29 K =-1.76940e-01 A 4=-2.43116e-06 A 6=-1.07245e-07 A 8=-2.89273e-09 A10=-1.28573e-11 A12= 1.75278e-15 A14= 1.80412e-17 A16= 3.81973e-21 A 3=-3.61691e-07 A 5= 2.85560e-07 A 7= 2.23171e-08 A 9= 2.43693e-10 A11= 3.47248e-13 A13=-4.89533e-16 A15=-3.61594e-19 Various data Zoom ratio 7.78 Wide-angle Mid-range Telephoto Focal length 15.40 45.00 119.76 F-number 2.72 2.71 3.65 Angle of view 43.86 18.21 7.04 Image height 14.80 14.80 14.80 Lens total length 353.98 353.98 353.98 BF 42.99 42.99 42.99 d18 1.15 37.59 55.59 d23 3.28 3.09 3.53 d25 40.18 4.72 2.08 d28 10.59 14.36 1.23 d33 9.78 5.24 2.56 Zoom lens group data Group starting plane focal length 1 1 46.95 2 19 -45.90 3 24 -80.55 4 26 -65.14 5 29 49.31 6 34 96.37

[0132] Table 1 shows the calculation results of each conditional expression based on the lens data of Numerical Examples 1 to 8 above. [Table 1] [Explanation of symbols]

[0133] L1 First lens group L11 1st sub-lens group L12 Second sub-lens group L13 Third sub-lens group L2 Second lens group L3: Third lens group L4 4th lens group L5 Fifth lens group L6 6th lens group SP aperture stop

Claims

1. A zoom lens having, in order from an object side to an image side, a first lens group having positive refractive power that does not move for zooming, three or more intermediate lens groups that move during zooming, and a rear lens group having positive refractive power, The spacing between adjacent lens groups changes during zooming. an aperture stop disposed in the rear lens group, in a lens group adjacent to the rear lens group, or between the rear lens group and a lens group adjacent to the rear lens group; the first lens group includes, in order from the object side to the image side, a first sub-lens group having negative refractive power that does not move for focusing, a second sub-lens group having positive refractive power that moves for focusing, and a third sub-lens group having positive refractive power; The focal length of the first lens group is f1, the length on the optical axis from the surface of the first lens group closest to the image side to the rear principal point of the first lens group is bok1, the focal length of the zoom lens at the wide-angle end is fw, and the focal length of the zoom lens at the telephoto end is ft, 1.700≦(f1+bok1) / f1≦2.200 1.50≦f1 / fw≦4.00 7.1≦ft / fw≦10.0 A zoom lens characterized by satisfying the following conditional expressions:

2. 2.10≦ft / f1≦8.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

3. The first lens group has a lens G1 having a negative refractive power closest to the object side, and the focal length of the lens G1 is fG1, -5.50≦fG1 / fw≦-1.60 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. The first sub-lens group has a focal length of fGp, 5.80≦fGp / fw≦20.60 2. The zoom lens according to claim 1, further comprising a lens Gp having a focal length fGp that satisfies the following condition:

5. The first lens group has a lens G1 having a negative refractive power closest to the object side, and the focal length of the lens G1 is fG1, -2.10≦fG1 / f1≦-0.80 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. The focal length of the first sub-lens group is f11, -1.50≦f11 / f1≦-0.75 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. The focal length of the second sub-lens group is f12, 2.00≦f12 / f1≦4.40 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

8. The focal length of the third sub-lens group is f13, 1.30≦f13 / f1≦1.80 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

9. The F-number of the zoom lens at the wide-angle end is Fnow, 2.00≦Fnow≦3.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

10. The average value of the refractive indexes for the d-line of all the negative lenses included in the first lens group is defined as nd1n, 1.75≦nd1n≦2.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

11. The first sub-lens group has an Abbe number for the d-line of νd11p, 17.0≦νd11p≦25.0 2. The zoom lens according to claim 1, further comprising a positive lens L11p having an Abbe number νd11p that satisfies the following condition:

12. The third sub-lens group has an Abbe number for the d-line of νd13n, 20.0≦νd13n≦50.0 2. The zoom lens according to claim 1, further comprising a negative lens L13n having an Abbe number νd13n that satisfies the following condition:

13. The first sub-lens group and the third sub-lens group have an Abbe number for the d-line of νd11p and another Abbe number for the d-line of νd13n, 3.0≦νd13n−νd11p≦25.0 2. The zoom lens according to claim 1, further comprising a positive lens L11p having an Abbe number νd11p that satisfies the following conditional expression, and a negative lens L13n having an Abbe number νd13n that satisfies the following conditional expression:

14. The thickness of the first lens group on the optical axis is defined as LD1, 1.50≦LD1 / f1≦3.30 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

15. The zoom lens according to claim 1 , wherein the third sub-lens group consists of five lenses or less.

16. Let BFw be the length on the optical axis from the image side surface of the lens closest to the image side having a finite focal length in the zoom lens to the image plane, 0.280≦fw / BFw≦0.430 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

17. A zoom lens according to any one of claims 1 to 16, and an image sensor for capturing an image formed by the zoom lens.

18. The diagonal length of the image sensor is 2Y, and the half angle of view at the wide-angle end is ωw. The half angle of view ωw is expressed as follows: ωw=arctan(Y / fw) It is defined by the formula: 41.2°≦ω≦50.0° 18. The imaging apparatus according to claim 17, wherein the following condition is satisfied:

19. The diagonal length of the image sensor is 2Y, and the half angle of view at the telephoto end is ωt. The half angle of view ωt is expressed as follows: ωt=arctan(Y / ft) It is defined by the formula: 4.30°≦ωt≦8.25° 18. The imaging apparatus according to claim 17, wherein the following condition is satisfied:

Images