JP2021076708A - Zoom lens and image capturing device - Google Patents

Abstract

To provide a zoom lens which is advantageous in terms of, for example, compactness, a wide view angle, a high zoom ratio, and high optical performance over an entire zoom range.SOLUTION: A zoom lens provided herein consists of a first lens group with positive refractive power configured to be stationary for zooming, two or three movable lens groups, including at least two lens groups with negative refractive power, configured to move for zooming, and a final lens group configured to be stationary for zooming, arranged in order from the object side to the image side, and is configured such that distance between each pair of adjacent lens groups changes for zooming. A focal length at the telephoto end, a focal length of the first lens group, and a composite lateral magnification of all lens groups located on the image side of a lens group with negative refractive power on the most image side in the two or three movable lens groups are each set appropriately.SELECTED DRAWING: Figure 1

Description

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

Imaging devices such as TV cameras, silver-salt film cameras, digital cameras, and video cameras are required to have a zoom lens having a wide angle of view, a high magnification ratio, a small size, and high optical performance. As a zoom lens with a wide angle of view and a high magnification ratio, in order from the object side to the image side, a positive lens group that does not move for magnification, a negative lens group that moves at magnification, and a negative lens group that moves at magnification. A zoom lens in which a positive lens group that does not move due to magnification change is arranged is known. (Patent Document 1)

Further, based on the positive lead type zoom lens consisting of the above-mentioned four groups, the number of lens groups that move at the time of magnification change is increased, and a zoom lens having a high angle of view, a high magnification ratio, a small size, and high performance is known. There is. (Patent Document 2)

Patent Document 1 discloses a zoom lens having a magnification ratio of about 14 times and a shooting angle of view of about 60 ° at a wide-angle end. Patent Document 2 discloses a zoom lens having a magnification ratio of about 22 times and a shooting angle of view of about 70 ° at the wide-angle end.

Japanese Unexamined Patent Publication No. 7-151966 Japanese Unexamined Patent Publication No. 2011-107693

The above-mentioned positive lead type zoom lens is relatively easy to widen the angle of view and increase the magnification, but in order to achieve both high optical performance and miniaturization, the refractive power arrangement of the lens is appropriately set. This is very important. In particular, since the first lens group on the object side is the lens group having the largest weight distribution among the zoom lenses, the refractive power of the first lens group and the lateral magnification of the lens group after the aperture are appropriately set. Is important.

An object of the present invention is, for example, to provide a zoom lens which is advantageous in terms of small size, wide angle of view, high magnification ratio, and high optical performance over the entire zoom range.

The zoom lens of the present invention sequentially includes a first lens group having a positive refractive force that does not move for scaling and a lens group having at least two negative refractive forces in order from the object side to the image side. It consists of two or three moving lens groups that move for magnification and a final lens group that does not move for magnification, and the distance between adjacent lens groups both changes due to magnification and is at the telephoto end. The focal distance in is ft, the focal distance of the first lens group is f1, and it is on the image side of the lens group NN having a negative refractive force on the image side of the two or three moving lens groups. The combined lateral magnification at the wide-angle end of all lens groups is βN.
3.7 <ft / f1 <5.0
0.5 <βN <2.0
It is characterized by satisfying the conditional expression.

According to the present invention, for example, it is possible to provide a zoom lens which is advantageous in terms of small size, wide angle of view, high magnification ratio, and high optical performance over the entire zoom range.

Numerical cross-sectional view of the lens when focusing on an infinite object at the wide-angle end of Example 1. Numerical Aberration diagram when focusing on an infinity object at the wide-angle end (A), middle zoom (B), and telephoto end (C) of Example 1. Numerical value Cross-sectional view of the lens when focusing on an infinite object at the wide-angle end of Example 2. Aberration diagram when focusing on an infinity object at the wide-angle end (A), middle zoom (B), and telephoto end (C) of Numerical Example 2. Numerical value Cross-sectional view of the lens when focusing on an infinite object at the wide-angle end of Example 3 Aberration diagram when focusing at infinity at the wide-angle end (A), middle zoom (B), and telephoto end (C) of Numerical Example 3 Numerical value Cross-sectional view of the lens when focusing on an infinite object at the wide-angle end of Example 4 Aberration diagram when focusing at infinity at the wide-angle end (A), middle zoom (B), and telephoto end (C) of Numerical Example 4 Schematic diagram of the main part of the image pickup apparatus of the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The zoom lenses of the present invention of Examples 1 to 4 have a first lens group having a positive refractive power that does not move for scaling in order from the object side to the image side. It also has two or three moving lens groups that move for scaling, including at least two lens groups with negative power, and a final lens group that does not move for scaling. The distance between adjacent lens groups changes due to scaling.

Here, the fact that each lens group is immobile when scaling is not driven for the purpose of scaling, but if scaling and focusing are performed at the same time, it may move for focusing. Is to get.

FIG. 1 is a cross-sectional view of the lens when the zoom lens of Example 1 (Numerical Example 1) of the present invention is in focus at an infinity object at the wide-angle end (focal length, f = 7.80 mm). FIG. 2 shows (A) wide-angle end (focal length, f = 7.80 mm), (B) middle zoom (focal length, f = 46.38 mm), and (C) telephoto end (focal length, f) of Numerical Example 1. = 202.80 mm) is an aberration diagram when focusing on an object at infinity. However, the focal length is a value when the value of the numerical example is expressed in mm. This is the same in each of the following examples.

FIG. 3 is a cross-sectional view of the lens when the zoom lens of Example 2 (Numerical Example 2) of the present invention is in focus at an infinity object at the wide-angle end (focal length, f = 7.70 mm). FIG. 4 shows (A) wide-angle end (focal length, f = 7.70 mm), (B) middle zoom (focal length, f = 46.78 mm), and (C) telephoto end (focal length, f) of Numerical Example 1. = 200.20 mm) is an aberration diagram when focusing on an object at infinity.

FIG. 5 is a cross-sectional view of the lens when the zoom lens of Example 3 (Numerical Example 3) of the present invention is in focus at an infinity object at the wide-angle end (focal length, f = 7.20 mm). FIG. 6 shows (A) wide-angle end (focal length, f = 7.20 mm), (B) middle zoom (focal length, f = 43.60 mm), and (C) telephoto end (focal length, f) of Numerical Example 1. It is an aberration diagram when focusing on an infinity object at (= 180.00 mm).

FIG. 7 is a cross-sectional view of the zoom lens of Example 4 (Numerical Example 4) of the present invention when the lens is in focus at an infinity object at the wide-angle end (focal length, f = 10.00 mm). FIG. 8 shows (A) wide-angle end (focal length, f = 10.00 mm), (B) middle zoom (focal length, f = 55.54 mm), and (C) telephoto end (focal length, f) of Numerical Example 1. It is an aberration diagram when focusing on an infinity object at (= 370.00 mm).
FIG. 9 is a schematic view of a main part of the image pickup apparatus of the present invention.

In each lens cross-sectional view, the left side is the subject (object) side (front) and the right side is the image side (rear). In the lens cross-sectional view, B1 is a first lens group (front lens group) having a positive refractive power that does not move due to scaling.

In the zoom lens of the first embodiment shown in FIG. 1, a zoom system (variable magnification lens group) is formed by the lens groups of B2 and B3. B4 is a fourth lens group (relay lens group) that performs an imaging action that does not move due to scaling.

In the zoom lenses of Examples 2 to 4 shown in FIGS. 3, 5 and 7, a zoom system (variable magnification lens group) is configured by the lens groups of B2 to B4. B5 is a fifth lens group (relay lens group) that performs an imaging action that does not move due to scaling.

SP is a diaphragm (opening diaphragm). GB corresponds to a spectroscopic prism, a low-pass filter, or the like of a camera.
The IP is an image pickup surface, and corresponds to an image pickup surface such as a solid-state image pickup element (photoelectric conversion element) that receives an image formed by a zoom lens and performs photoelectric conversion.

In the aberration diagram, the solid line and the alternate long and short dash line in spherical aberration are e-line and g-line, respectively. The dashed line and the solid line in the astigmatism are the meridional image plane and the sagittal image plane, respectively, and the alternate long and short dash line in the chromatic aberration of magnification is the g line, respectively. ω is a half angle of view and Fno is an F number.
In each of the following embodiments, the case where the zoom lens group is arranged on the shortest focal point side is referred to as the wide-angle end, and the case where the zoom lens group is arranged on the longest focal point side is referred to as the telephoto end.

The zoom lens of the present invention has a first lens group having a positive refractive power that does not move for scaling in order from the object side to the image side. In addition, it has two or three moving lens groups that move for scaling and a final lens group that does not move for scaling, including at least two lens groups with negative powers.

Let ft be the focal length at the telephoto end. The focal length of the first lens group is f1, and the wide-angle ends of all the lens groups RG on the image side of the lens group NN having the negative refractive power on the image side of the two or three moving lens groups. With βN as the synthetic lateral magnification in
3.7 <ft / f1 <10.0 ... (1)
-2.0 <βN <-0.5 ... (2)
Satisfies the conditional expression.

The conditional expression (1) defines the relationship between the focal length at the telephoto end and the focal length of the first lens group. The first lens group is the lens group on the most object side, and the subsequent groups increase aberrations, manufacturing errors, and the like. Therefore, the allowable value of the aberration and the manufacturing error of the first lens group is determined by the conditional expression (1).

In the zoom lens of each embodiment, by satisfying the conditional expression (1), it is possible to satisfactorily correct various aberrations while suppressing the increase in size of the lens.
If the upper limit of the conditional expression (1) is exceeded, it becomes difficult to suppress various aberrations, particularly chromatic aberration on the telephoto side. If the lower limit of the conditional expression (1) is exceeded, the size of the lens becomes large.

The conditional expression (2) defines the lateral magnification at the wide-angle end of the lens group RG. In the zoom lens of each embodiment, by satisfying the conditional expression (2), it is possible to satisfactorily correct various aberrations while suppressing the increase in size of the lens.

If the upper limit of the conditional expression (2) is exceeded, the aberration of the lens group arranged on the object side of the lens group RG is enlarged, and it becomes difficult to suppress various aberrations. In addition, the diameter of the lens group RG group increases. If the lower limit of the conditional expression (2) is exceeded, the size of the lens becomes large.

More preferably, the numerical range of the conditional expressions (1) and (2) is set as follows.
3.99 <ft / f1 <7.00 ... (1a)
-1.70 <βN <-1.00 ... (2a)

By satisfying each of the above conditional expressions, each embodiment of the present invention obtains a compact and lightweight zoom lens in which aberration correction is satisfactorily corrected over the entire zoom range.

More preferably, the zoom lens of the present invention has L as the distance from the most image-side surface of the first lens group to the most object-side surface of the final lens group, and is negative from the most image-side surface of the negative lens group N1. Let D be the distance to the surface of the lens group NN on the most object side.
0.2 <D / L <0.7 ... (3)
It is good to satisfy the conditional expression.

The conditional expression (3) defines the relationship between the lens spacing in the moving group and the total length of the lens, so that the amount of light is appropriately regulated by the negative lens group NN and various aberrations are suppressed.
If the upper limit of the conditional expression (3) is exceeded, the light amount correction effect by the negative lens group NN cannot be appropriately performed, and it becomes difficult to suppress the aberration. When the lower limit of the conditional expression (3) is exceeded, the diameter of the lens group RG group increases.

More preferably, the zoom lens of the present invention has the maximum effective diameter of the negative lens group N1 as EV and the minimum effective diameter of the negative lens group NN as EC.
1.05 <EV / EC <3.00 ... (4)
It is good to satisfy the conditional expression.

The conditional expression (4) defines the relationship between the effective diameters of the negative lens group N1 and the negative lens group NN. As a result, the amount of light is appropriately regulated by the negative lens group NN, and various aberrations are suppressed.
If the upper limit of the conditional expression (4) is exceeded, the light amount correction effect by the negative lens group NN cannot be appropriately performed, and it becomes difficult to suppress the aberration. When the lower limit of the conditional expression (4) is exceeded, the diameter of the RG group increases.

More preferably, the zoom lens of the present invention includes the most object-side negative lens group N1 among the negative lens groups included in the moving lens group among the moving lens groups at the wide-angle end, and starts from the negative lens group N1. Let f2 be the combined focal distance of all lens groups VG that are closer to the object than the widest air spacing between the negative lens group N1 and the negative lens group NN.
-6.0 <f1 / f2 <-2.5 ... (5)
It is good to satisfy the conditional expression.

The conditional expression (5) defines the relationship between the focal lengths of the first lens group and the lens group VG. This makes it possible to satisfactorily correct various aberrations while suppressing the increase in size of the lens.
If the upper limit of the conditional expression (5) is exceeded, it becomes difficult to suppress various aberrations, particularly chromatic aberration on the telephoto side. If the lower limit of the conditional expression (5) is exceeded, the size of the lens becomes large.

The zoom lens of the present invention more preferably has an aperture diaphragm on the image side of the negative lens group NN. As a result, the aperture diaphragm does not move, or the amount of movement can be reduced, and the mechanical load can be reduced.

The zoom lens of the present invention more preferably has a focal length at the wide-angle end as fw.
10.0 <ft / fw <60.0 ... (6)
It is good to satisfy the conditional expression.

Conditional expression (6) defines the relationship between the focal lengths at the wide-angle end and the telephoto end.
By satisfying the conditional expression (6), it is possible to satisfactorily correct various aberrations while suppressing an increase in the size of the lens.

More preferably, the zoom lens of the present invention has the air conversion interval from the lens surface on the image side of the final lens group to the imaging surface as bf.
0.08 <fw / bf <0.80 ... (7)
It is good to satisfy the conditional expression.

Conditional expression (7) defines the relationship between the focal length at the wide-angle end and the back focus.
By satisfying the conditional expression (7), it is possible to satisfactorily correct various aberrations while suppressing an increase in the size of the lens.

More preferably, the zoom lens of the present invention has at least three positive lenses in the first lens group. This makes it possible to set an appropriate focal length for the first lens group when widening the angle or scaling, and it is possible to satisfactorily correct various aberrations while suppressing the enlargement of the lens. Become.

The zoom lens of the present invention more preferably has a lens group VG having at least four lenses. As a result, it is possible to set an appropriate focal length for the lens group VG when the angle is widened or the magnification ratio is increased, and it is possible to satisfactorily correct various aberrations while suppressing the enlargement of the lens. ..

More preferably, the numerical range of the conditional expressions (3) to (7) is set as follows.
0.30 <D / L <0.60 ... (3a)
1.20 <EV / EC <2.50 ... (4a)
-5.00 <f1 / f2 <-3.20 ... (5a)
15.00 <ft / fw <50.00 ... (6a)
0.10 <fw / bf <0.50 ... (7a)
Next, the features of the lens configuration of each embodiment will be described.

In the first embodiment, the first lens group B1 corresponds to the first to twelfth surfaces. The second lens group B2 corresponds to the 13th to 19th planes. The third lens group B3 corresponds to the 20th to 22nd planes. The 23rd surface is an aperture diaphragm. The fourth lens group B4 corresponds to the 24th to 41st planes. The camera optical system GB corresponds to the 42nd to 44th planes.

In the zoom lens of the first embodiment, the second lens group B2 corresponds to the negative lens group N1, the third lens group B3 corresponds to the negative lens group NN, and the second lens group B2 corresponds to the lens group VG. The fourth lens group B4 corresponds to the lens group RG group.

As shown in Table 1 to be described later, Numerical Example 1 satisfies all of the conditional expressions (1) to (7), and has a high magnification ratio of 26.00 times and a shooting angle of view at the wide-angle end. The angle of view) is 70.38 °, which is a wide angle of view. Moreover, high optical performance is obtained by satisfactorily correcting various aberrations in the entire zoom range.

In the second embodiment, the first lens group B1 corresponds to the first to twelfth surfaces. The second lens group B2 corresponds to the 13th to 19th planes. The third lens group B3 corresponds to the 20th to 22nd planes. The fourth lens group B4 corresponds to the 23rd to 24th planes. The 25th surface is an aperture diaphragm. The fifth lens group B5 corresponds to the 26th to 38th planes. The camera optical system GB corresponds to the 39th to 41st planes.

In the zoom lens of the second embodiment, the second lens group B2 corresponds to the negative lens group N1, the third lens group B3 corresponds to the negative lens group NN, and the second lens group B2 corresponds to the lens group VG. The fourth lens group B4 and the fifth lens group B5 correspond to the lens group RG group.

Compared with Example 1, a part of the fixed fourth lens group B4 at the time of scaling of Example 1 is moved at the time of scaling. As a result, various aberrations are satisfactorily corrected while suppressing the increase in size of the lens.

As shown in Table 1 to be described later, Numerical Example 1 satisfies all of the conditional expressions (1) to (7), and has a high magnification ratio of 26.00 times and a shooting angle of view at the wide-angle end. The angle of view) is 71.08 °, which is a wide angle of view. Moreover, high optical performance is obtained by satisfactorily correcting various aberrations in the entire zoom range.

In the third embodiment, the first lens group B1 corresponds to the first to thirteenth surfaces. The second lens group B2 corresponds to the 14th to 18th planes. The third lens group B3 corresponds to the 19th to 21st planes. The fourth lens group B4 corresponds to the 22nd to 24th planes. The 25th surface is an aperture diaphragm. The fifth lens group B5 corresponds to the 26th to 42nd planes. The camera optical system GB corresponds to the 43rd to 45th planes.

In the zoom lens of Example 3, the second lens group B2 corresponds to the negative lens group N1, the fourth lens group B4 corresponds to the negative lens group NN, and the second lens group B2 and the third lens group B3 correspond to the lens. It corresponds to the group VG, and the fifth lens group B5 corresponds to the lens group RG group.

Compared with Example 1, a part of the second lens group B2 of Example 1 is moved in a trajectory different from that of the second lens group B2 at the time of scaling. As a result, various aberrations are satisfactorily corrected while suppressing the increase in size of the lens.

As shown in Table 1 to be described later, Numerical Example 1 satisfies all of the conditional expressions (1) to (7), and has a high magnification ratio of 25.00 times and a shooting angle of view at the wide-angle end. Angle of view) A wide angle of view of 74.76 ° has been achieved. Moreover, high optical performance is obtained by satisfactorily correcting various aberrations in the entire zoom range.

In the fourth embodiment, the first lens group B1 corresponds to the first to tenth surfaces. The second lens group B2 corresponds to the eleventh surface to the twelfth surface. The third lens group B3 corresponds to the 13th to 17th planes. The fourth lens group B4 corresponds to the 18th to 20th planes. The 21st surface is an aperture diaphragm. The fifth lens group B5 corresponds to the 22nd to 37th planes. The camera optical system GB corresponds to the 38th to 40th planes.

In the zoom lens of Example 4, the second lens group B2 corresponds to the negative lens group N1, the fourth lens group B4 corresponds to the negative lens group NN, and the second lens group B2 and the third lens group B3 correspond to the lens. It corresponds to the group VG, and the fifth lens group B5 corresponds to the lens group RG group.

Compared with Example 1, a part of the second lens group B2 of Example 1 is moved by a trajectory different from that of the second lens group B2 at the time of scaling. As a result, various aberrations are satisfactorily corrected while suppressing the increase in size of the lens.

As shown in Table 1 to be described later, Numerical Example 1 satisfies all of the conditional expressions (1) to (7), and has a high magnification ratio of 37.00 times and a shooting angle of view at the wide-angle end. The angle of view) is 57.62 °, which is a wide angle of view. Moreover, high optical performance is obtained by satisfactorily correcting various aberrations in the entire zoom range.

As described above, according to each embodiment, the arrangement of the refractive power of each lens group, the movement locus of the moving lens group for zooming, and the like are appropriately defined. As a result, a zoom lens in which various aberrations are satisfactorily corrected while achieving both high magnification and a wide angle of view is obtained.

FIG. 9 is a schematic view of a main part of an image pickup apparatus (television camera system) using the zoom lenses of Examples 1 to 4 as a photographing optical system. In FIG. 9, 101 is a zoom lens according to any one of Examples 1 to 4. 124 is a camera. The zoom lens 101 is removable from the camera 124. Reference numeral 125 denotes an imaging device configured by attaching a zoom lens 101 to a camera 124. The zoom lens 101 has a first lens group F, a zoom unit LZ, and a fifth lens group R for imaging.

The zoom unit LZ is a lens group that moves on the optical axis for the scaling of Examples 1 to 4. SP is an aperture stop. Reference numerals 114 and 115 are drive mechanisms such as a helicoid and a cam that drive the focusing group and the zoom unit LZ in the optical axis direction, respectively.

Reference numerals 116 to 118 are motors (driving means) for electrically driving the drive mechanisms 114, 115 and the aperture stop SP. Reference numerals 119 to 121 are detectors such as an encoder, a potentiometer, or a photosensor for detecting the position of the focusing group or the zoom unit LZ on the optical axis and the aperture diameter of the aperture aperture SP. In the camera 124, 109 is a glass block corresponding to an optical filter in the camera 124, and 110 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101.

Further, 111 and 122 are CPUs that control various drives of the camera 124 and the zoom lens 101. By applying the zoom lens of the present invention to a television camera in this way, an image pickup device having high optical performance is realized.

Although the preferred examples of the present invention have been described above, it goes without saying that the present invention is not limited to these examples, and various modifications and modifications can be made within the scope of the gist thereof.

Numerical Examples 1 to 4 with respect to Examples 1 to 4 of the present invention are shown below. In each numerical embodiment, i indicates the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, di is the distance between the i-th surface and the (i + 1) surface from the object side, and ndi. , Νdi is the refractive index and Abbe number of the optical member between the i-th plane and the (i + 1) -th plane. Aspherical surfaces are marked with * next to the surface number. Table 1 shows the correspondence between each embodiment and the above-mentioned conditional expression.

The aspherical shape has an X-axis in the optical axis direction, an H-axis in the direction perpendicular to the optical axis, a positive light traveling direction, R is the paraxial radius of curvature, k is a conical constant, A4, A6, A8, A10, A12, When A14 and A16 are the aspherical coefficients, they are expressed by the following equations. Further, "e-Z" means " ^{x10 -Z} ".

The amount of movement of the lens group that moves during magnification changes according to the following formula when the negative lens group N1 on the most object side that moves during magnification is moved by a straight line connecting the wide-angle end and the telephoto end. Further, the lens group on the image side that moves at the time of magnification change moves for image plane fluctuation correction due to magnification change.

As for the amount of movement, j is the number of the lens group, the amount of movement in the optical axis direction is fj (y), the traveling direction of light is positive, and y is the amount of movement from the wide-angle end to the telephoto end as 1, Bj1 and Bj2. , Bj3, Bj4, Bj5, Bj6, Bj7, and Bj8, respectively, and are expressed by the following equations.

<Numerical Example 1>
Unit mm

Surface data Surface number rd nd vd Effective diameter
1 -92.097 2.70 1.83400 37.2 62.54
2 104.950 1.41 61.33
3 106.289 12.06 1.43387 95.1 61.91
4 -86.563 0.20 62.07
5 156.317 8.07 1.43387 95.1 60.78
6 -119.953 3.08 60.55
7 133.027 5.78 1.43387 95.1 56.49
8-297.197 0.20 55.89
9 79.872 5.13 1.43387 95.1 51.94
10 511.149 0.34 51.01
11 46.354 4.60 1.76385 48.5 47.24
12 98.827 (variable) 46.36
13 * 60.444 1.00 2.00330 28.3 20.59
14 11.057 5.18 16.24
15 -35.951 5.95 1.80810 22.8 15.84
16 -10.278 0.75 1.88300 40.8 15.62
17 99.561 0.18 15.74
18 31.818 2.45 1.80518 25.4 15.90
19 -695.709 (variable) 15.72
20 -24.328 0.90 1.75500 52.3 16.45
21 40.199 2.51 1.84666 23.8 18.01
22 -374.844 (variable) 18.58
23 (Aperture) ∞ 1.00 31.97
24 ∞ 4.39 1.65844 50.9 32.72
25 -47.699 0.15 33.32
26 255.705 4.61 1.53172 48.8 34.20
27 -59.341 0.15 34.36
28 52.381 8.18 1.48749 70.2 33.47
29 -38.908 1.00 1.88300 40.8 32.88
30 330.737 36.60 32.64
31 71.830 7.33 1.51742 52.4 32.50
32 -53.351 0.50 32.01
33 107.384 1.00 1.88300 40.8 29.53
34 22.642 7.61 1.49700 81.5 27.43
35 6822.282 3.00 26.81
36 65.343 8.32 1.51742 52.4 25.49
37 -20.451 1.00 1.88300 40.8 24.47
38 216.200 0.13 24.68
39 62.443 7.20 1.48749 70.2 24.86
40 -27.696 4.50 24.81
41 ∞ 33.00 1.60859 46.4 40.00
42 ∞ 13.20 1.51633 64.1 40.00
43 ∞ 7.05 40.00
Image plane ∞

13th surface of aspherical data
K = -5.17119e + 001 A 4 = 4.37510e-005 A 6 = -1.36242e-007 A 8 = -3.35163e-009 A10 = 1.02869e-010 A12 = -1.21902e-012 A14 = 6.75412e-015 A16 =-1.42700e-017

Zoom movement data
B21 = 35.21982

Various data Zoom ratio 26.00
Wide-angle medium telephoto focal length 7.80 46.38 202.80
F number 1.80 1.80 4.58
Half angle of view 35.19 6.76 1.55
Image height 5.50 5.50 5.50
Lens overall length 247.58 247.58 247.58
BF 40.72 40.72 40.72

d12 0.54 28.72 35.76
d19 33.96 3.16 14.28
d22 17.69 20.32 2.16

Entrance pupil position 38.35 188.21 631.20
Exit pupil position 420.15 420.15 420.15
Front principal point position 46.30 239.80 933.55
Rear principal point position -0.75 -39.34 -195.75

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 46.75 43.57 26.26 1.37
2 13 -11.76 15.51 0.67 -10.68
3 20 -37.98 3.41 -0.21 -2.09
4 23 67.05 92.18 76.05 -112.70
5 41 ∞ 46.20 14.58 -14.58

Single lens Data lens Start surface Focal length
1 1 -58.08
2 3 111.80
3 5 157.43
4 7 212.13
5 9 216.86
6 11 109.56
7 13 -13.51
8 15 15.97
9 16 -10.46
10 18 37.50
11 20 -19.86
12 21 42.58
13 24 72.11
14 26 90.60
15 28 47.03
16 29 -39.15
17 31 60.10
18 33 -32.49
19 34 45.56
20 36 31.00
21 37 -21.00
22 39 40.28
23 41 0.00
24 42 0.00

<Numerical Example 2>
Unit mm

Surface data Surface number rd nd vd Effective diameter
1 -128.650 2.70 1.83400 37.2 67.62
2 97.360 1.29 64.18
3 99.221 11.65 1.43387 95.1 64.35
4 -114.886 0.20 64.21
5 139.344 7.99 1.43387 95.1 61.80
6 -145.554 3.44 61.42
7 129.275 5.63 1.43387 95.1 57.44
8-413.194 0.20 57.08
9 79.576 5.57 1.43387 95.1 54.55
10 535.053 0.34 53.82
11 49.897 4.90 1.76385 48.5 50.58
12 108.006 (variable) 49.77
13 * 469.659 1.00 2.00330 28.3 21.17
14 12.967 4.31 17.00
15 -65.486 6.08 1.80810 22.8 16.68
16 -11.187 0.75 1.88300 40.8 16.17
17 52.168 0.18 15.82
18 29.518 2.33 1.80518 25.4 15.91
19 310.848 (variable) 15.68
20 -23.621 0.90 1.72916 54.7 14.92
21 31.087 2.22 1.84666 23.8 16.34
22 273.558 (variable) 16.81
23 * 80.911 5.64 1.69680 55.5 28.51
24-63.305 (variable) 29.37
25 (Aperture) ∞ 0.74 31.32
26 61.716 7.56 1.48749 70.2 31.87
27 -52.322 1.50 2.00100 29.1 31.73
28 -83.185 36.58 32.04
29 43.554 6.47 1.51742 52.4 26.57
30 -60.615 1.59 25.65
31 -63.851 1.00 1.88300 40.8 24.30
32 20.761 6.99 1.49700 81.5 23.27
33 -167.247 0.35 23.63
34 89.625 7.44 1.51742 52.4 23.81
35 -21.192 1.00 1.88300 40.8 23.75
36 -60.959 0.13 24.57
37 60.109 6.77 1.48749 70.2 24.82
38 -31.806 4.50 24.59
39 ∞ 33.00 1.60859 46.4 40.00
40 ∞ 13.20 1.51633 64.1 40.00
41 ∞ 7.05 40.00
Image plane ∞

13th surface of aspherical data
K = -2.444487e + 003 A 4 = 2.30750e-005 A 6 = -7.26344e-008 A 8 = 5.46544e-010 A10 = -2.84953e-011 A12 = 6.08622e-013 A14 = -5.25344e-015 A16 = 1.61567e-017

Page 23
K = -2.28242e + 000 A 4 = -3.36794e-006 A 6 = 2.31031e-009 A 8 = -1.60557e-012

Zoom movement data
B21 = 36.94734
B31 = -16.66891 B32 = -209.81035 B33 = 2015.15665 B34 = -7417.88501
B35 = 132223.21657 B36 = -11213.07858 B37 = 36376.65965

Various data Zoom ratio 26.00
Wide-angle medium telephoto focal length 7.70 46.78 200.20
F number 1.80 1.85 4.08
Half angle of view 35.54 6.71 1.57
Image height 5.50 5.50 5.50
Lens overall length 238.93 238.93 238.93
BF 40.72 40.72 40.72

d12 0.59 30.15 37.54
d19 30.09 2.73 11.73
d22 13.89 16.61 2.11
d24 8.19 3.28 1.38

Entrance pupil position 40.45 208.65 745.39
Exit pupil position 269.63 269.63 269.63
Front principal point position 48.38 263.76 1098.22
Rear principal point position -0.65 -39.73 -193.15

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 50.08 43.91 26.03 -0.38
2 13 -11.20 14.66 0.92 -9.05
3 20 -33.04 3.12 0.11 -1.60
4 23 51.58 5.64 1.89 -1.48
5 25 58.22 78.12 70.19 -38.19
6 39 ∞ 46.20 14.58 -14.58

Single lens Data lens Start surface Focal length
1 1 -65.67
2 3 124.45
3 5 165.07
4 7 227.10
5 9 214.12
6 11 116.56
7 13 -13.20
8 15 15.73
9 16 -10.31
10 18 39.99
11 20 -18.20
12 21 40.85
13 23 51.58
14 26 59.18
15 27 -143.24
16 29 49.82
17 31 -17.54
18 32 37.52
19 34 33.75
20 35 -37.01
21 37 43.58

<Numerical Example 3>
Unit mm

Surface data Surface number rd nd vd Effective diameter
1 -118.230 2.50 1.89190 37.1 61.47
2 143.847 1.35 59.23
3 207.691 2.50 1.74951 35.3 59.22
4 85.335 12.01 1.43387 95.1 58.56
5 -85.525 0.20 58.63
6 91.912 8.69 1.43387 95.1 56.97
7 -133.181 2.34 56.69
8 119.449 4.40 1.43387 95.1 52.58
9 -1287.038 0.20 52.02
10 76.095 4.73 1.43387 95.1 49.05
11 610.969 0.34 48.31
12 41.949 4.39 1.76385 48.5 44.69
13 98.181 (variable) 44.22
14 * 159.432 1.00 2.00330 28.3 19.25
15 11.736 3.70 15.29
16 -52.410 5.52 1.80518 25.4 15.03
17 -9.746 0.75 1.88300 40.8 14.27
18 27.930 (variable) 13.56
19 27.385 4.08 1.76182 26.5 13.65
20 -12.064 0.75 1.95375 32.3 13.49
21 -51.695 (variable) 13.53
22 -23.145 0.90 1.75500 52.3 18.16
23 49.279 2.44 1.84666 23.8 20.29
24-255.759 (variable) 20.88
25 (Aperture) ∞ 1.00 32.58
26 ∞ 4.65 1.65844 50.9 33.49
27 -43.835 0.15 34.11
28 767.659 4.79 1.53172 48.8 35.28
29 -52.364 0.15 35.55
30 58.440 8.73 1.48749 70.2 34.95
31 -36.828 1.00 1.88300 40.8 34.46
32 -383.470 36.60 34.56
33 61.677 7.69 1.51742 52.4 32.82
34 -53.737 0.48 32.17
35 290.109 1.00 1.88300 40.8 29.75
36 22.695 8.16 1.49700 81.5 27.53
37 -180.850 0.35 27.05
38 43.424 9.07 1.51742 52.4 26.13
39 -21.139 1.00 1.88300 40.8 24.86
40 67.338 0.13 24.70
41 44.253 7.88 1.48749 70.2 24.93
42 -26.933 4.50 24.92
43 ∞ 33.00 1.60859 46.4 40.00
44 ∞ 13.20 1.51633 64.1 40.00
45 ∞ 7.05 40.00
Image plane ∞

14th surface of aspherical data
K = 8.36645e + 001 A 4 = 3.33061e-005 A 6 = -1.33804e-007 A 8 = 2.18990e-010 A10 = 2.83776e-012 A12 = 1.52923e-013 A14 = -3.25037e-015 A16 = 1.68378 e-017

Zoom movement data
B21 = 31.71554
B31 = 33.87002 B32 = 10.09732 B33 = -56.49757 B34 = 107.08374 B35 = -91.52456
B36 = 30.63785

Various data Zoom ratio 25.00
Wide-angle medium telephoto focal length 7.20 43.60 180.00
F number 1.80 1.93 4.32
Half angle of view 37.38 7.19 1.75
Image height 5.50 5.50 5.50
Lens overall length 243.15 243.15 243.15
BF 40.72 40.72 40.72

d13 0.39 25.76 32.11
d18 0.47 1.63 2.42
d21 33.30 3.63 10.18
d24 12.63 15.77 2.09

Entrance pupil position 35.85 170.26 543.22
Exit pupil position 829.44 829.44 829.44
Front principal point position 43.11 216.17 762.62
Rear principal point position -0.15 -36.56 -172.96

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 41.72 43.65 25.82 1.38
2 14 -6.09 10.97 2.63 -3.90
3 19 32.83 4.83 0.44 -2.29
4 22 -36.71 3.34 -0.26 -2.10
5 25 61.72 92.84 65.88 -114.40
6 43 ∞ 46.20 14.58 -14.58

Single lens Data lens Start surface Focal length
1 1 -71.97
2 3 -193.67
3 4 100.34
4 6 126.51
5 8 25 1.54
6 10 199.30
7 12 92.29
8 14 -12.57
9 16 13.93
10 17 -8.06
11 19 11.41
12 20 -16.53
13 22 -20.65
14 23 48.50
15 26 66.26
16 28 91.93
17 30 47.62
18 31 -45.93
19 33 56.54
20 35 -27.77
21 36 41.00
22 38 28.73
23 39 -18.02
24 41 35.52

<Numerical Example 4>
Unit mm

Surface data Surface number rd nd vd Effective diameter
1 -363.765 2.70 1.89190 37.1 78.91
2 133.521 9.05 75.39
3 231.978 11.98 1.43387 95.1 74.91
4-101.283 6.99 74.71
5 123.396 9.35 1.43387 95.1 68.68
6 -196.897 0.20 68.01
7 67.231 8.25 1.43387 95.1 60.32
8 1087.314 0.34 59.19
9 42.557 5.18 1.49700 81.5 48.60
10 84.376 (variable) 47.74
11 * 136.502 1.00 2.00330 28.3 25.11
12 25.201 (variable) 21.91
13 -25.905 0.90 1.88300 40.8 20.77
14 29.021 5.09 1.80810 22.8 20.08
15 -28.040 1.56 19.90
16 -17.531 1.10 1.69680 55.5 19.45
17 -31.429 (variable) 19.68
18 -28.800 0.90 1.75500 52.3 12.45
19 29.535 2.05 1.84666 23.8 13.14
20 169.822 (variable) 13.51
21 (Aperture) ∞ 1.00 35.16
22 ∞ 4.26 1.65844 50.9 35.72
23 -59.636 0.15 36.20
24 400.260 4.69 1.53172 48.8 36.64
25 -62.074 0.15 36.72
26 50.634 8.43 1.48749 70.2 35.17
27 -44.099 1.00 1.88300 40.8 34.43
28 128.966 36.60 33.73
29 51.491 7.88 1.51742 52.4 33.53
30 -66.029 0.50 32.82
31 35.250 3.41 1.49700 81.5 28.95
32 56.418 1.50 1.89190 37.1 27.45
33 18.633 0.47 24.41
34 18.421 10.32 1.51742 52.4 24.48
35 -26.222 1.50 1.88300 40.8 23.00
36 34.418 6.80 1.51742 52.4 21.96
37 -30.910 4.50 21.79
38 ∞ 33.00 1.60859 46.4 40.00
39 ∞ 13.20 1.51633 64.1 40.00
40 ∞ 7.05 40.00
Image plane ∞

Aspherical data surface 11
K = -4.12581e + 001 A 4 = 1.25993e-005 A 6 = -2.03115e-008 A 8 = 1.05572e-009 A10 = -2.08595e-011 A12 = 2.11436e-013 A14 = -1.01279e-015 A16 = 1.92996e-018

Zoom movement data
B21 = 35.93965
B31 = 37.14155 B32 = -16.56594 B33 = 87.35584 B34 = -164.85230 B35 = 157.91133
B36 = -56.54727 B37 = 4.04332

Various data Zoom ratio 37.00
Wide-angle medium telephoto focal length 10.00 55.54 370.00
F number 2.00 2.08 7.67
Half angle of view 28.81 5.66 0.85
Image height 5.50 5.50 5.50
Lens overall length 274.15 274.15 274.15
BF 40.72 40.72 40.72

d10 0.86 29.61 36.80
d12 5.41 9.05 9.87
d17 33.10 1.67 29.30
d20 38.77 37.82 2.18

Entrance pupil position 58.37 255.18 1203.25
Exit pupil position -223.95 -223.95 -223.95
Front principal point position 67.94 297.37 980.60
Rear principal point position -2.95 -48.49 -362.95

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 55.13 54.03 34.52 -0.29
2 11 -30.69 1.00 0.61 0.11
3 13 -42.79 8.64 -1.17 -6.75
4 18 -35.40 2.95 0.23 -1.38
5 21 51.97 88.66 36.50 -67.65
6 38 ∞ 46.20 14.58 -14.58

Single lens Data lens Start surface Focal length
1 1 -108.54
2 3 163.87
3 5 175.96
4 7 164.35
5 9 165.45
6 11 -30.69
7 13 -15.29
8 14 18.20
9 16 -58.56
10 18 -19.10
11 19 41.54
12 22 90.15
13 24 100.93
14 26 49.64
15 27 -36.90
16 29 56.97
17 31 178.89
18 32 -31.59
19 34 22.61
20 35 -16.56
21 36 32.49

B1: 1st lens group B2: 2nd lens group B3: 3rd lens group B4: 4th lens group B5: 5th lens group

Claims (10)

From the object side to the image side, a first lens group with a positive refractive power that does not move for scaling and two that move for scaling, including at least two negative refractive power lens groups. Or a zoom lens consisting of three moving lens groups and a final lens group that does not move due to scaling.
The distance between adjacent lens groups changes due to magnification change,
The focal length at the telephoto end is ft, the focal length of the first lens group is f1, and the image side of the two or three moving lens groups is closer to the image side than the lens group NN having a negative refractive power. Let βN be the combined lateral magnification at the wide-angle end of all the lens groups in
3.7 <ft / f1 <10.0
-2.0 <βN <-0.5
A zoom lens characterized by satisfying the conditional expression. The distance from the most image-side surface of the first lens group to the most object-side surface of the final lens group is L, and the negative refractive power on the object side of the two or three moving lens groups is defined as L. Let D be the distance from the most image-side surface of the lens group N1 to the most object-side surface of the lens group NN.
0.2 <D / L <0.7
The zoom lens according to claim 1, wherein the zoom lens satisfies the conditional expression. The maximum effective diameter of the lens group N1 having the negative refractive power closest to the object side of the two or three moving lens groups is EV, and the minimum effective diameter of the lens group NN is EC.
1.05 <EV / EC <3.00
The zoom lens according to claim 1 or 2, wherein the conditional expression is satisfied. The two of the two or three moving lens groups at the wide-angle end, which are closer to the object than the widest air spacing between the lens group N1 having a negative refractive power on the object side and the lens group NN. Alternatively, the combined focal length of all the lens groups among the three moving lens groups is set to f2.
-6.0 <f1 / f2 <-2.5
The zoom lens according to claim 1 or 3, wherein the conditional expression is satisfied. The zoom lens according to any one of claims 1 to 4, wherein an aperture diaphragm is provided on the image side of the lens group NN. With the focal length at the wide-angle end as fw,
10.0 <ft / fw <60.0
The zoom lens according to any one of claims 1 to 5, which satisfies the conditional expression. The focal length at the wide-angle end is fw, and the air conversion interval from the lens surface on the image side of the final lens group to the imaging surface is bf.
0.08 <fw / bf <0.80
The zoom lens according to any one of claims 1 to 6, wherein the conditional expression is satisfied. The zoom lens according to any one of claims 1 to 7, wherein the first lens group has at least three positive lenses. At the wide-angle end, the two or three moving lens groups on the object side of the widest air spacing between the lens group N1 having a negative refractive power on the object side and the lens group NN. The zoom lens according to any one of claims 1 to 8, wherein all the lens groups among the three moving lens groups have at least four lenses. The zoom lens according to any one of claims 1 to 9.
An image sensor that receives the light of the image formed by the zoom lens and
An imaging device characterized by having.

Images