JP2016173530A - Zoom lens and imaging device mounted with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens which has high aperture and zoom ratios, is small and lightweight as a whole system and achieves high optical performance.SOLUTION: A zoom lens comprises, in an order from an object side to an image side: a first lens group U1 which has positive refractive power; a variable power system having at least two lenses or more which move along an optical axis when zooming; and a rear lens group LR. In the zoom lens, a distance between neighboring lens groups is varied when zooming. The variable power system has, in the order from the object side to the image side: a second lens group U2 having negative refractive power; and a third lens group U3 having the negative refractive power. The second lens group moves to the image side when zooming from a wide angle end to a telephoto end. The variable power system also has an aperture diaphragm at a position closer to the image side than the second lens group. In the zoom lens, a focal length f1 of the first lens group, the focal length f2 of the second lens group, an imaging magnification ratio β2w of the second lens group, a distance L12w between the first lens group and the second lens group on an optical axis, and a length L1Sw along the optical axis from a lens surface closest to the image side in the first lens group to the aperture diaphragm at a wide angle end satisfy a specific conditional equation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and is suitable as an image pickup optical system of an image pickup apparatus such as a broadcast television camera, a movie camera, a video camera, a digital still camera, and a silver salt photographic camera. .

  In recent years, there has been a demand for a zoom lens having a large aperture ratio and a high zoom ratio, a small size and light weight, and high optical performance for an imaging optical system used in an imaging apparatus. As a zoom lens with a high zoom ratio, there is a positive lead type zoom lens in which a lens unit having positive refractive power that does not move during zooming is arranged closest to the object side, and is composed of four lens groups or five lens groups as a whole. (Patent Documents 1 to 6).

  In Patent Documents 1 to 3, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. A fourth group zoom lens configured by the fourth lens group is disclosed. In the zoom lenses disclosed in Patent Documents 1 to 3, the second lens group and the third lens group move during zooming. In Patent Document 4, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a first lens group having a positive refractive power. A four-group zoom lens composed of four lens groups is disclosed. In the zoom lens of Patent Document 4, the second lens group and the third lens group move during zooming.

  Patent Document 1 discloses a zoom lens with a zoom ratio of about 2.6, a shooting field angle (view angle) at the wide-angle end of about 47 °, and a large aperture and a high zoom ratio of about F-number 3.5. Patent Document 2 discloses a zoom lens having a zoom ratio of about 2.9, a shooting field angle (view angle) at the wide-angle end of about 53 °, and a large aperture and a high zoom ratio of about F number 2.0.

  Patent Document 3 discloses a zoom lens having a large aperture and a high zoom ratio with a zoom ratio of about 15.0, a shooting angle of view (view angle) at the wide-angle end of about 20 °, and an F number of about 2.8. Patent Document 4 discloses a zoom lens having a zoom ratio of about 2.7, a shooting angle of view (view angle) at the wide-angle end of about 34 °, and an F number of about 2.8 with a large aperture and a high zoom ratio.

  In Patent Documents 5 and 6, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. A 5-group zoom lens including a fourth lens group and a fifth lens group having a positive refractive power is disclosed. In this five-group zoom lens, the second lens group having a negative refractive power, the third lens group having a negative refractive power, and the fourth lens group having a positive refractive power move during zooming.

Japanese Patent Application Laid-Open No. 07-027978 Japanese Patent Laid-Open No. 06-089442 JP 2007-139858 A JP 2009-086537 A Japanese Patent Laid-Open No. 02-050120 JP 04-147110 A

  The zoom lens used in imaging devices such as TV cameras and video cameras has a compact and lightweight system, a high zoom ratio and high image quality (high resolution) over the entire zoom range, and a large aperture ratio. Something is desired.

  In a positive lead type zoom lens, in order to obtain high optical performance while achieving a large aperture ratio, a high zoom ratio, a reduction in size and weight of the entire system, for example, telephoto at the wide-angle end, change in the lens group that moves during zooming, etc. Ensuring a sufficient ratio is important. Furthermore, it is important to reduce the size and weight of the first lens group. In particular, it is important to appropriately set the imaging magnification (magnification ratio) of the second lens group at the wide-angle end and the refractive power and lens configuration of each lens group constituting the variable magnification system with the first lens group. come.

  The zoom lenses disclosed in Patent Documents 1 and 2 are not necessarily sufficient for telephoto and high zoom ratios at the wide-angle end. The zoom lens of Patent Document 3 achieves telephoto at a wide angle end and a high zoom ratio. However, in order to further increase the telephoto and the zoom ratio at the wide angle end, the image forming magnification of the second lens group at the wide angle end and the refraction of each lens group constituting the variable magnification system with the first lens group. The force and lens configuration are not always sufficient.

  Although Patent Document 4 achieves telephoto at the wide-angle end, the third lens group draws a convex locus on the image side during zooming from the wide-angle end to the telephoto end with positive refractive power. For this reason, since it is a disadvantageous configuration for achieving a high zoom ratio, it is difficult to achieve a high zoom ratio. In the five-group zoom lens of Patent Documents 5 and 6, the entire system is reduced in size and performance, but the zoom ratio of the second lens group during zooming from the wide-angle end to the telephoto end is small. The zoom ratio was not always sufficient.

  An object of the present invention is to provide a zoom lens having a large aperture ratio and a high zoom ratio, the entire system being small and light, and having high optical performance, and an imaging apparatus having the same.

The zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a positive refractive power that does not move during zooming, a zooming system that includes two or more lens units that move during zooming, and a rear lens unit. A zoom lens in which the interval between adjacent lens groups changes during zooming,
The zooming system has, in order from the object side to the image side, a second lens unit having a negative refractive power that moves during zooming, and a third lens group having a negative refractive power that moves during zooming, from the wide-angle end to the telephoto end. The second lens group moves toward the image side during zooming, and has an aperture stop closer to the image side than the second lens group,
The focal lengths of the first lens group and the second lens group are f1 and f2, respectively, the imaging magnification of the second lens group at the wide angle end is β2w, and the light of the first lens group and the second lens group at the wide angle end. When the interval on the axis is L12w, and the length on the optical axis from the lens surface closest to the image side of the first lens group at the wide angle end to the aperture stop is L1Sw,
2.8 <| f1 / f2 | <10.0
β2w <3.50 × 10 ⁻³ × | f1 / f2 | ³ −8.49 × 10 ⁻² × | f1 / f2 | ² + 6.90 × 10 ⁻¹ × | f1 / f2 | −2.22
| L12w / L1Sw | <0.10
It is characterized by satisfying the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens having a large aperture ratio and a high zoom ratio, the entire system being small and light, and having high optical performance, and an image pickup apparatus having the zoom lens.

Sectional view of the lens at the wide-angle end of Embodiment 1 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 1 of the present invention. Sectional view of the lens at the wide-angle end of Embodiment 2 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 2 of the present invention. Sectional view of the lens at the wide-angle end of Embodiment 3 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 3 of the present invention. Cross-sectional view of a lens at a wide angle end according to Embodiment 4 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 4 of the present invention. Lens cross-sectional view at the wide angle end according to Embodiment 5 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 5 of the present invention. Cross-sectional view of a lens at a wide angle end according to Embodiment 6 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 6 of the present invention. Lens cross-sectional view at the wide angle end according to Embodiment 7 of the present invention (A), (B), (C) Aberration diagrams at zoom positions in Example 7 of the present invention. (A), (B), (C) Explanatory drawing of the movement locus | trajectory of each lens group accompanying zooming of Example 1,2,5,6. (A), (B), (C) Explanatory drawing of the movement locus | trajectory of each lens group accompanying the zooming of Example 3, 4. (A), (B), (C) Explanatory drawing of the movement locus | trajectory of each lens group accompanying zooming of Example 7. FIG. (A), (B) Explanatory drawing of optical arrangement | positioning of a 1st lens group and a 2nd lens group (A), (B) Explanatory drawing of optical arrangement | positioning of a 1st lens group and a 2nd lens group Explanatory drawing regarding conditional expressions (1) and (2) Schematic diagram of main parts of an imaging apparatus of the present invention

  Next, the features of the lens configuration of each example will be described. The zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a positive refractive power that does not move during zooming, a zooming system that includes two or more lens units that move during zooming, and a rear lens unit. ing. The distance between adjacent lens units changes during zooming. The zooming system includes, in order from the object side to the image side, a second lens unit having a negative refractive power that moves during zooming, and a third lens group having a negative refractive power that moves during zooming. During zooming from the wide-angle end to the telephoto end, the second lens group moves to the image side, and has an aperture stop closer to the image side than the second lens group.

  FIG. 1 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 1 of the present invention. 2A, 2 </ b> B, and 2 </ b> C show the vertical direction at the wide-angle end, the intermediate zoom position (focal length 200.00 mm), and the telephoto end, respectively, when focusing on the object at infinity according to the first embodiment. It is an aberration diagram. Example 1 is a zoom lens having a zoom ratio of 7.0 times, a half angle of view of 10.65 degrees at the wide angle end, and a 1.54 degree half angle of view at the telephoto end. However, the value of the focal length is a value when a numerical example described later is expressed in mm. This is the same in all of the following numerical examples.

  FIG. 3 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention. 4A, 4 </ b> B, and 4 </ b> C show the vertical direction at the wide-angle end, the intermediate zoom position (focal length 158.11 mm), and the telephoto end, respectively, when focusing on the object at infinity according to the second embodiment. It is an aberration diagram. Example 2 is a zoom lens having a zoom ratio of 4.0 times, a half angle of view of 10.0 degrees at the wide angle end, and a half angle of view of 2.52 degrees at the telephoto end.

  FIG. 5 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention. FIGS. 6A, 6B, and 6C show the vertical position at the wide-angle end, the intermediate zoom position (focal length 150.00 mm), and the telephoto end, respectively, when focusing on the object at infinity according to the third embodiment. It is an aberration diagram. Example 3 is a zoom lens with a zoom ratio of 20.0 times, a half angle of view of 9.46 degrees at the wide angle end, and a 0.48 degree half angle of view at the telephoto end.

  FIG. 7 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 4 of the present invention. FIGS. 8A, 8B, and 8C are longitudinal views at the wide-angle end, the intermediate zoom position (focal length 130.00 mm), and the telephoto end, respectively, when focusing on an object at infinity according to the fourth embodiment. It is an aberration diagram. Example 4 is a zoom lens having a zoom ratio of 6.8 times, a half angle of view of 16.49 degrees at the wide angle end, and a half angle of view of 2.49 degrees at the telephoto end.

  FIG. 9 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 5 of the present invention. FIGS. 10A, 10B, and 10C show the vertical direction at the wide-angle end, the intermediate zoom position (focal length 256.51 mm), and the telephoto end, respectively, when focusing on the object at infinity according to the fifth embodiment. It is an aberration diagram. The fifth embodiment is a zoom lens having a zoom ratio of 7.97 times, a half angle of view of 8.9 degrees at the wide angle end, and a half angle of view of 1.13 degrees at the telephoto end.

  FIG. 11 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 6 of the present invention. FIGS. 12A, 12B, and 12C show the vertical position at the wide-angle end, the intermediate zoom position (focal length 220.24 mm), and the telephoto end, respectively, when focusing on the object at infinity according to the sixth embodiment. It is an aberration diagram. Example 6 is a zoom lens with a zoom ratio of 5.0 times, a half angle of view of 8.03 degrees at the wide angle end, and a 1.62 degree half angle of view at the telephoto end.

  FIG. 13 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 7 of the present invention. FIGS. 14A, 14B, and 14C show the vertical direction at the wide-angle end, the intermediate zoom position (focal length 180.31 mm), and the telephoto end, respectively, when focusing on the object at infinity according to the seventh embodiment. It is an aberration diagram. The zoom lens according to the seventh embodiment has a zoom ratio of 22.0 times, a half angle of view of 7.83 degrees at the wide angle end, and a half angle of view of 0.36 degrees at the telephoto end.

  FIGS. 15A, 15B, and 15C are explanatory views of the paraxial arrangement and the movement trajectory of each lens group during zooming from the wide-angle end to the telephoto end in the zoom lenses of Examples 1, 2, 5, and 6. FIGS. It is. FIGS. 16A, 16 </ b> B, and 16 </ b> C are explanatory views of the paraxial arrangement and the movement trajectory of each lens group during zooming from the wide-angle end to the telephoto end in the zoom lenses of Examples 3 and 4. FIGS. FIGS. 17A, 17B, and 17C are explanatory views of the paraxial arrangement and the movement trajectory of each lens group during zooming from the wide-angle end to the telephoto end in the zoom lens of Example 7. FIGS.

  FIGS. 18A and 18B are schematic views of optical arrangements at the wide-angle end and the telephoto end of the first lens unit U1 and the second lens unit U2 in each embodiment of the present invention. FIGS. 19A and 19B are optical path diagrams of the paraxial arrangement of the first lens group and the second lens group at the wide-angle end of the zoom lens of each embodiment and on-axis paraxial rays. FIG. 20 is a numerical diagram for conditional expressions (1), (2), and (2a) of Examples 1 to 7. FIG. 21 is a schematic diagram of a main part of the imaging apparatus of the present invention.

  15, 16, and 17, arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end. In the lens cross-sectional view, an arrow related to the focus indicates the moving direction of the subgroup F during focusing from an object at infinity to an object at a short distance. In the lens cross-sectional view, U1 is a first lens unit having a positive refractive power that does not move during zooming. The first lens unit U1 includes a partial group F that moves during focusing.

  LZ is a zooming system including two or more lens groups that move during zooming. R is a rear lens unit having a positive refractive power for imaging that does not move during zooming. 5 and 13, P is a color separation prism or an optical filter, and is shown as a glass block. The variable magnification system LZ is a second lens group (variator lens group) having a negative refractive power that moves to the image plane side during zooming from the wide-angle end (short focal length end) to the telephoto end (long focal length end). U2. Further, the third lens unit (having a negative refractive power) moves in conjunction with the zooming of the second lens unit U2 and moves along a locus convex toward the object side in order to correct the image plane variation accompanying the zooming ( Compensation lens group) U3.

  In addition, the zooming system LZ has a fourth lens unit U4 having a positive refractive power that moves during zooming on the image side of the third lens unit U3. Alternatively, the variable magnification system LZ has a fourth lens unit U4 having negative refractive power that moves during zooming on the image side of the third lens unit U3.

  In the lens cross-sectional view, SP is an aperture stop. IP is an image plane, which corresponds to the imaging plane of a solid-state imaging element (photoelectric conversion element). In each embodiment, the lens group or the partial group refers to an aggregate including one or more lenses separated by a lens interval that changes during at least one of focusing and zooming.

  In the aberration diagrams, spherical aberration is represented by e-line (solid line) and g-line (dotted line). Astigmatism is represented by the e-line meridional image plane (M) (dotted line) and the e-line sagittal image plane (S) (solid line). The lateral chromatic aberration is represented by the g-line. Fno is an F number, and ω is a half angle of view (degrees). In all the aberration diagrams, the spherical aberration is drawn on a scale of 0.5 mm, the astigmatism is 0.5 mm, the distortion is 5%, and the lateral chromatic aberration is drawn on a scale of 0.05 mm. The wide-angle end and the telephoto end are zoom positions when the second lens unit U2 for zooming is positioned at both ends of a range in which the mechanism can move on the optical axis.

  In Examples 1, 2, 5, and 6, the zooming system LZ is in order from the object side to the image side, the second lens unit U2 having a negative refractive power, the third lens unit U3 having a negative refractive power, and a positive refractive power. Consists of a fourth lens unit U4. The second lens unit U2, the third lens unit U3, and the fourth lens unit U4 move along a locus as shown in FIG. 15 during zooming. That is, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 moves toward the image side, and the third lens unit U3 and the fourth lens unit U4 move along a locus that is convex toward the object side. The rear lens unit R includes a fifth lens unit U5 having a positive refractive power.

  In Examples 3 and 4, the zooming system LZ includes, in order from the object side to the image side, a second lens unit U2 having a negative refractive power and a third lens unit U3 having a negative refractive power. The second lens unit U2 and the third lens unit U3 move along a locus as shown in FIG. 16 during zooming. That is, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 moves toward the image side, and the third lens unit U3 moves along a locus that is convex toward the object side. The rear lens unit R includes a fourth lens unit U4 having a positive refractive power.

  In the seventh embodiment, the zooming system LZ includes, in order from the object side to the image side, a second lens unit U2 having a negative refractive power, a third lens unit U3 having a negative refractive power, and a fourth lens unit U4 having a negative refractive power. Composed. The second lens unit U2, the third lens unit U3, and the fourth lens unit U4 move along a locus as shown in FIG. 17 during zooming. That is, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 moves toward the image side, and the third lens unit U3 and the fourth lens unit U4 move along a locus that is convex toward the object side. The rear lens unit R includes a fifth lens unit U5 having a positive refractive power.

  In each embodiment of the present invention, the rear lens group R is composed of a lens group having positive refractive power that does not move during zooming, but the present invention is not limited to this. For example, a part of the rear lens group may move during zooming. In Examples 1, 3, 4, and 7, the aperture stop SP is disposed on the image side of the variable magnification system LZ. In Examples 2, 5, and 6, the aperture stop SP is disposed between the lenses of the plurality of lenses constituting the rear lens group R. In each embodiment, the aperture stop SP may be arranged at any position on the image side of the second lens unit U2.

  The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens unit U1 having a positive refractive power that does not move during zooming. Furthermore, it has a second lens unit U2 having negative refractive power that moves during zooming, and a third lens unit U3 having negative refractive power that moves during zooming. During zooming from the wide-angle end to the telephoto end, the second lens unit U2 moves to the image side. Further, an aperture stop SP is provided on the image side of the second lens unit U2.

The focal lengths of the first lens unit U1 and the second lens unit U2 are f1 and f2, respectively. The imaging magnification of the second lens unit U2 at the wide angle end is β2w, the distance on the optical axis between the first lens unit U1 and the second lens unit U2 at the wide angle end is L12w, and the most image side of the first lens unit U1 at the wide angle end. The length from the lens surface to the aperture stop SP on the optical axis is L1Sw. At this time,
2.8 <| f1 / f2 | <10.0 (1)
β2w <3.50 × 10 ⁻³ × | f1 / f2 | ³ −8.49 × 10 ⁻² × | f1 / f2 | ² + 6.90 × 10 ⁻¹ × | f1 / f2 | −2.22 (2)
| L12w / L1Sw | <0.10 (3)
The following conditional expression is satisfied.

  Next, the technical meaning of each conditional expression described above will be described. Here, taking a 5-group zoom lens composed of 5 lens groups as an example, the focal length of the entire system is expressed by the following equation. Now, let fw be the focal length of the entire system at the wide-angle end. Let ft be the focal length of the entire system at the telephoto end. The focal length of the first lens unit U1 when focused on an object at infinity is f1, the imaging magnification of the second lens unit U2 at the wide angle end is β2w, and the third lens unit U3 is imaged at the wide angle end. The magnification is β3w.

  The imaging magnification of the fourth lens unit U4 at the wide-angle end is β4w, the imaging magnification of the second lens unit U2 at the telephoto end is β2t, the imaging magnification of the third lens unit U3 at the telephoto end is β3t, and the telephoto end Let β4t be the imaging magnification of the fourth lens unit U4. An enlargement ratio of the fifth lens unit U5 is β5. Let the zoom ratio be Z.

At this time, the focal length fw of the entire system at the wide angle end, the focal length ft of the entire system at the telephoto end, and the zoom ratio Z are fw = f1 × β2w × β3w × β4w × β5 (X1)
ft = f1 × β2t × β3t × β4t × β5 (X2)
Z = ft / fw = β2t / β2w × β3t / β3w × β4t / β4w (X3)
It becomes.

The imaging magnification of the second lens unit U2 that contributes to zooming is expressed by the following equation. Now, the focal length of the second lens unit U2 is f2, the distance between the principal points of the first lens unit U1 and the second lens unit U2 at the wide-angle end is H12w, and zooming from the wide-angle end to the telephoto end of the second lens unit U2 is performed. The moving amount is m2. At this time, the imaging magnifications β2w and β2t of the second lens unit U2 at the wide-angle end and the telephoto end are respectively
β2w = f2 / (f1−H12w + f2) (X4)
β2t = f2 / (f1−H12w−mv + f2) (X5)
It becomes.

Further, the imaging magnification β5 of the fifth lens unit U5 is expressed by the following equation. The distance from the object point to the fifth lens unit U5 to the front principal point position of the fifth lens unit U5 is S, and the distance from the image point to the fifth lens unit U5 to the rear principal point position of the fifth lens unit U5. Is S ′. At this time, the imaging magnification β5 is
β5 = S ′ / S (X6)
It becomes.

  In the zoom lens of each embodiment, in order to achieve telephoto, a large aperture, a high zoom ratio, a reduction in size and weight of the entire system, and an increase in performance, the parameters f1 in the equations (X1) to (X6) β2w, β3w, β4w, β2t, β3t, β4t, β5, etc. are appropriately set.

  FIGS. 18A and 18B are schematic views of optical arrangements at the wide-angle end and the telephoto end of the first lens unit U1 and the second lens unit U2. 18A and 18B, H12w is the principal point interval between the first lens unit U1 and the second lens unit U2, and N is the object point position with respect to the second lens unit U2 (the image point position of the first lens unit U1). It is. In order to achieve telephoto at the wide-angle end, secure a sufficient zoom ratio in the second lens unit U2, and reduce the size and weight of the first lens unit U1, the relationship between the parameters f1, f2, and β2w is set appropriately. It is important to do.

  Conditional expression (1) defines the ratio between the focal length of the first lens unit U1 and the focal length of the second lens unit U2. If the upper limit of conditional expression (1) is exceeded, the negative refractive power of the second lens unit U2 becomes too strong with respect to the positive refractive power of the first lens unit U1 (the absolute value of refractive power becomes too large). In zooming, fluctuations in various aberrations such as spherical aberration and coma increase. It becomes difficult to correct fluctuations of these various aberrations.

  Further, the positive refractive power of the first lens unit U1 becomes too weak with respect to the negative refractive power of the second lens unit U2 (the absolute value of the refractive power becomes too small), and the lens of the first lens unit U1. The diameter increases and it is difficult to reduce the size and weight of the first lens unit U1.

  If the lower limit of conditional expression (1) is not reached, the negative refractive power of the second lens unit U2 becomes too weak with respect to the positive refractive power of the first lens unit U1, and the amount of movement of the second lens unit U2 during zooming This increases the zoom ratio and makes it difficult to reduce the size of the entire system. In addition, the positive refractive power of the first lens unit U1 is too strong with respect to the negative refractive power of the second lens unit U2, and lateral chromatic aberration and distortion on the wide angle side than the first lens unit U1, and spherical aberration on the telephoto side. Many of them occur, making it difficult to correct these various aberrations. More preferably, conditional expression (1) should be set as follows.

2.90 <| f1 / f2 | <9.00 (1a)
The larger the numerical value of the conditional expression (1), the higher the zoom ratio becomes easier. At the same time, in order to effectively achieve telephoto at the wide angle end, the imaging magnification of the second lens unit U2 at the wide angle end. It is important to set this appropriately.

  FIG. 15 shows the paraxial arrangement and the movement trajectories of the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 in the zoom lens of Example 1 from zooming to the telephoto end. The second lens unit U2 moves from the object side to the image side from the wide-angle end to the telephoto end for zooming. The third lens unit U3 moves along a locus convex toward the object side during zooming from the wide-angle end to the telephoto end.

  The imaging magnification β2 in the second lens unit U2 changes greatly in the negative direction from the wide angle end to the telephoto end. As shown in FIG. 15, as the second lens unit U2 is located closer to the image side at the wide angle end, the value of the imaging magnification β2w ′ at the second lens unit U2 at the wide angle end can be increased in the negative direction. Telephoto at the edge can be effectively performed. On the other hand, when trying to achieve a high zoom ratio, as shown in FIG. 15, the imaging magnification β2w ′ is increased in the negative direction, and the telephoto end of the second lens unit U2, which is the main variable magnification lens unit, is connected. It is necessary to increase the image magnification β2t ′ in the negative direction.

  However, if the imaging magnification β2w ′ is excessively increased in the negative direction, for example, the fourth lens unit U4 and the fifth lens unit U5 tend to interfere with each other at the telephoto end. For this reason, a sufficient zoom ratio cannot be ensured by the second lens unit U2, and it becomes difficult to achieve a high zoom ratio.

  Conditional expression (2) defines the imaging magnification of the second lens unit U2 at the wide angle end with respect to the ratio of the focal length of the first lens unit U1 and the focal length of the second lens unit U2. If the upper limit of conditional expression (2) is exceeded, the imaging magnification β2w of the second lens unit U2 at the wide angle end becomes too small in the negative direction, making it difficult to achieve telephoto at the wide angle end. More preferably, conditional expression (2) should be set as follows.

4.30 × 10 ⁻³ × | f1 / f2 | ³ −1.16 × 10 ⁻¹ × | f1 / f2 | ² + 1.04 × | f1 / f2 | −3.57 <β2w (2a)

  If the lower limit of conditional expression (2a) is not reached, the imaging magnification β2w of the second lens unit U2 at the wide angle end becomes too large in the negative direction, and for example, the fourth lens unit U4 and the fifth lens unit U5 at the telephoto end. Tends to interfere with each other, making it difficult to achieve a high zoom ratio. Furthermore, the principal point interval H12w between the first lens unit U1 and the second lens unit U2 becomes too large at the wide-angle end, and the interval L12w between the first lens unit U1 and the second lens unit U2 becomes too large. For this reason, it becomes difficult to shorten the overall length of the variable magnification LZ and to reduce the size and weight of the first lens unit U1.

  FIG. 20 is a numerical diagram for conditional expressions (1), (2), and (2a) of Examples 1 to 7. Conditional expression (3) is the distance L12w on the optical axis between the first lens unit U1 and the second lens unit U2 at the wide-angle end, and the light from the lens surface closest to the image side of the first lens unit U1 at the wide-angle end to the aperture stop SP. The ratio of the length L1Sw on the axis is specified.

If the upper limit value of conditional expression (3) is exceeded, the distance L12w on the optical axis between the first lens unit U1 and the second lens unit U2 at the wide angle end from the lens surface closest to the image side of the first lens unit U1. The length L1Sw on the optical axis to the aperture stop SP becomes too small. As a result, the distance between the first lens unit U1 and the second lens unit U2 on the optical axis becomes too large at the wide-angle end, making it difficult to shorten the overall length of the zooming system LZ and reducing the size and weight of the first lens unit U1. It becomes difficult. More preferably, conditional expression (3) should be set as follows.
| L12w / L1Sw | <0.06 (3a)

  By satisfying the above configuration, the zoom lens of each embodiment achieves a large aperture ratio, a high zoom ratio, a small size and light weight in the entire system, and high optical performance over the entire zoom range. In each embodiment, it is more preferable to satisfy one or more of the following conditional expressions. The imaging magnification at the telephoto end of the second lens unit U2 is β2t. Let the focal length of the third lens unit U3 be f3. The length (optical total length) on the optical axis from the most object side lens surface to the most image side lens surface at the wide-angle end is defined as DTw. The length on the optical axis from the image side principal point position of the first lens unit U1 to the object side principal point position of the second lens unit U2 at the wide angle end is defined as H12w.

  The thickness of the first lens unit U1 on the optical axis is D1, and the length from the most image side lens surface of the first lens unit U1 to the image side principal point position of the first lens unit U1 is H1k. The thickness of the second lens unit U2 on the optical axis is D2, and the length from the most object side lens surface of the second lens unit U2 to the object side principal point position of the second lens unit U2 is H21. At this time, it is preferable to satisfy one or more of the following conditional expressions.

4.00 <| β2t / β2w | <600.00 (4)
0.70 <| f1 / f3 | <6.00 (5)
1.40 <DTw / f1 <2.20 (6)
0.15 <H12w / f1 <0.75 (7)
−0.95 <H1k / D1 <−0.30 (8)
-0.10 <H21 / D2 <0.70 (9)
1.30 <f1 / D1 <2.20 (10)

Further, when the zoom lens of each embodiment is applied to an image pickup apparatus having an image pickup element that receives an image formed by the zoom lens, it is preferable that at least one of the following conditional expressions is satisfied. The focal length of the entire system at the wide angle end is fw, the zoom ratio of the entire system is Z, and the diagonal length of the image size of the image sensor is φ. At this time, one or more of the following conditional expressions should be satisfied.
1.40 <fw / φ (11)
3.0 <Z (12)
Here, when the zoom ratio Z is ft as the focal length of the entire system at the telephoto end,
Z = ft / fw
It is.

  Next, the technical meaning of each conditional expression described above will be described. Conditional expression (4) defines the ratio of the imaging magnification β2w at the wide-angle end of the second lens unit U2 and the imaging magnification β2t at the telephoto end of the second lens unit U2.

By satisfying conditional expression (4), aberration fluctuations associated with zooming are reduced well, and a high zoom ratio and a reduction in size and weight of the entire system are achieved. If the upper limit of the conditional expression (4) is exceeded and the magnification ratio of the second lens unit U2 becomes too large, the negative refractive power of the second lens unit U2 becomes strong. In particular, at the telephoto end, spherical aberration and axial chromatic aberration are increased. Etc. becomes difficult to correct. If the lower limit of the conditional expression (4) is exceeded and the zoom ratio of the second lens unit U2, which is the main variable lens unit, becomes too small, it is difficult to achieve a high zoom ratio. More preferably, conditional expression (4) should be set as follows.
6.00 <β2t / β2w <400.00 (4a)

  Conditional expression (5) defines the ratio between the focal length of the first lens unit U1 and the focal length of the third lens unit U3. If the upper limit of conditional expression (5) is exceeded and the negative refractive power of the third lens unit U3 becomes too strong with respect to the positive refractive power of the first lens unit U1, various aberrations such as spherical aberration and coma during zooming Fluctuations increase, making it difficult to reduce fluctuations in these aberrations. Further, the positive refractive power of the first lens unit U1 becomes too weak relative to the negative refractive power of the third lens unit U3, the lens diameter of the first lens unit U1 increases, and the small size and light weight of the first lens unit U1. It becomes difficult.

If the negative refractive power of the third lens unit U3 becomes too weak with respect to the positive refractive power of the first lens unit U1 below the lower limit value of the conditional expression (5), the amount of movement of the third lens unit U3 during zooming Therefore, it becomes difficult to achieve a high zoom ratio and a reduction in size and weight of the entire system. Further, the positive refractive power of the first lens unit U1 becomes too strong with respect to the negative refractive power of the third lens unit U3, and lateral chromatic aberration and distortion on the wide angle side than the first lens unit U1, spherical aberration on the telephoto side, and the like. Many aberrations occur, and it becomes difficult to correct these aberrations. More preferably, conditional expression (5) should be set as follows.
0.80 <| f1 / f3 | <4.00 (5a)

  In each embodiment, the third lens unit U3 moves along a locus that is convex toward the object side during zooming from the wide-angle end to the telephoto end. If the zoom stroke of the third lens unit U3 is reduced during zooming from the wide-angle end to the telephoto end, the zoom stroke of the second lens unit U2 can be made sufficiently long, so that a high zoom ratio can be easily achieved.

  Conditional expression (6) defines the ratio of the length (optical total length) DTw on the optical axis from the lens surface closest to the object side to the lens surface closest to the image side at the wide angle end to the focal length of the first lens unit U1. Yes. If the upper limit of conditional expression (6) is exceeded and the optical total length becomes too long with respect to the focal length of the first lens unit U1, it is difficult to reduce the size and weight of the entire lens system. Further, the positive refractive power of the first lens unit U1 becomes too strong with respect to the entire optical length, and various aberrations such as chromatic aberration of magnification and distortion on the wide angle side and spherical aberration on the telephoto side occur more than the first lens unit U1. It becomes difficult to correct various aberrations.

If the optical total length becomes too short with respect to the focal length of the first lens unit U1 below the lower limit value of the conditional expression (6), it is difficult to reduce the size and weight of the first lens unit U1. Furthermore, the weight of the first lens unit U1 is too heavy for the entire lens, and it is difficult for the photographer to balance when carrying the shoulder of the zoom lens. More preferably, conditional expression (6) should be set as follows.
1.55 <DTw / f1 <2.10 (6a)

  FIG. 19 is a paraxial arrangement of the first lens unit U1 and the second lens unit U2 at the wide-angle end of the zoom lens of each embodiment, and an optical path diagram of axial paraxial rays. Here, the axial paraxial ray is a ray defined as follows. An on-axis paraxial ray is a paraxial ray that is normalized with the focal length of the wide-angle end of the entire optical system as 1, and is incident on the optical system with an incident height of 1 parallel to the optical axis. It is assumed that the object is on the left side of the optical system, and light rays incident on the optical system from the object side travel from left to right.

  Compared to FIG. 19A, in FIG. 19B, the image-side principal point position of the first lens unit U1 is arranged closer to the object side, and the object-side principal point position of the second lens unit U2 is arranged closer to the image side. ing. The length H12w on the optical axis from the image-side principal point position of the first lens unit U1 to the object-side principal point position of the second lens unit U2 at the wide-angle end can be increased, and the focal position of the second lens unit U2 can be increased. The object point of the first lens unit U1 can be brought closer. As a result, the imaging magnification β2w at the wide angle end of the second lens unit U2 can be increased in the negative direction, and telephoto at the wide angle end can be achieved.

  Conditional expression (7) indicates that the length H12w on the optical axis from the image side principal point position of the first lens unit U1 to the object side principal point position of the second lens unit U2 and the focal length of the first lens unit U1 at the wide angle end. The ratio is specified.

  If the upper limit of conditional expression (7) is exceeded and the distance between the principal points of the first lens unit U1 and the second lens unit U2 at the wide-angle end becomes too large with respect to the focal length of the first lens unit U1, the telephoto lens is telephoto at the wide-angle end. Therefore, it is difficult to achieve a high zoom ratio. Further, the positive refractive power of the first lens unit U1 is too strong with respect to the principal point interval between the first lens unit U1 and the second lens unit U2 at the wide angle end. Many aberrations such as lateral chromatic aberration and distortion occur on the wide-angle side of the first lens unit U1 and spherical aberration occurs on the telephoto side, making it difficult to correct these aberrations.

If the distance between the principal points of the first lens unit U1 and the second lens unit U2 at the wide-angle end becomes too small with respect to the focal length of the first lens unit U1 below the lower limit value of the conditional expression (7), Telephoto becomes difficult. Further, the lens diameter of the first lens unit U1 increases, and it becomes difficult to reduce the size and weight of the first lens unit U1. More preferably, conditional expression (7) should be set as follows.
0.20 <H12w / f1 <0.65 (7a)

  Conditional expression (8) has a thickness D1 on the optical axis of the first lens unit U1 and a length H1k from the most image side lens surface of the first lens unit U1 to the image side principal point position of the first lens unit U1. The ratio is specified. The upper limit of conditional expression (8) is exceeded, and the thickness of the first lens unit U1 on the optical axis increases with respect to the distance from the most image-side lens surface of the first lens unit U1 to the image-side principal point position. If it is too long, the imaging magnification of the second lens unit U2 at the wide-angle end cannot be increased in the negative direction. As a result, telephoto at the wide angle end becomes difficult. If the distance between the first lens unit U1 and the second lens unit U2 on the optical axis becomes too large, it is difficult to shorten the overall length of the zooming system LZ and it is difficult to reduce the size and weight of the first lens unit U1. It becomes.

If the lower limit of conditional expression (8) is not reached and the image-side principal point position of the first lens unit U1 is placed too far on the object side, it will be too telephoto at the wide-angle end, making it difficult to achieve a high zoom ratio. Further, since the image side principal point position of the first lens unit U1 is excessively arranged on the object side, the refractive power of each lens in the first lens unit U1 becomes too strong. As a result, many aberrations such as lateral chromatic aberration and distortion occur on the wide-angle side from the first lens unit U1 and spherical aberration occurs on the telephoto side, making it difficult to correct these aberrations. More preferably, conditional expression (8) should be set as follows.
−0.90 <H1k / D1 <−0.40 (8a)

  Conditional expression (9) is for the thickness D2 on the optical axis of the second lens unit U2 and the length H21 from the most object side lens surface of the second lens unit U2 to the object side principal point position of the second lens unit U2. The ratio is specified.

  If the upper limit of conditional expression (9) is exceeded and the object side principal point position of the second lens unit U2 is placed too far on the image side, it will become too telephoto at the wide angle end, making it difficult to achieve a high zoom ratio. Further, since the object side principal point position of the second lens unit U2 is excessively arranged on the image side, the refractive power of each lens in the second lens unit U2 becomes too strong. As a result, various aberrations such as lateral chromatic aberration and distortion occur on the wide angle side from the second lens unit U2 and spherical aberration occurs on the telephoto side, making it difficult to correct these various aberrations.

The thickness on the optical axis of the second lens unit U2 is larger than the lower limit value of the conditional expression (9) and the distance from the most object side lens surface of the second lens unit U2 to the object side principal point position is increased. If it is too long, the imaging magnification of the second lens unit U2 cannot be increased in the negative direction at the wide-angle end. As a result, telephoto at the wide angle end becomes difficult. Further, since the distance on the optical axis between the first lens unit U1 and the second lens unit U2 becomes too large, it is difficult to shorten the overall length of the zooming system LZ and it is difficult to reduce the size and weight of the first lens unit U1. It becomes. More preferably, conditional expression (9) should be set as follows.
−0.05 <H21 / D2 <0.60 (9a)

  Conditional expression (10) defines the ratio of the focal length of the first lens unit U1 to the thickness of the first lens unit U1 on the optical axis. When the upper limit of conditional expression (10) is exceeded and the thickness on the optical axis of the first lens unit U1 becomes smaller than the focal length of the first lens unit U1, the first lens unit U1 and the second lens unit U2 The interval on the optical axis increases. For this reason, the overall length of the zooming system LZ increases and it is difficult to reduce the size and weight of the first lens unit U1.

If the thickness on the optical axis of the first lens unit U1 is larger than the lower limit value of the conditional expression (10) and the focal length of the first lens unit U1, the telephoto lens becomes too telephoto at the wide angle end, so that the zoom ratio is increased. It becomes difficult. Further, the positive refractive power of the first lens unit U1 becomes too strong, and various aberrations such as lateral chromatic aberration and distortion occur on the wide-angle side, and spherical aberration occurs on the telephoto side, and correction of these aberrations occurs. It becomes difficult. More preferably, conditional expression (10) should be set as follows.
1.40 <f1 / D1 <2.10 (10a)

Conditional expression (11) defines the focal length of the entire system at the wide-angle end, and conditional expression (12) defines a preferable range of the zoom ratio. If the lower limit of conditional expression (11) is not reached, the angle of view at the wide-angle end becomes excessively wide, the lens diameter of the first lens unit U1 becomes too large, and it is difficult to reduce the size and weight of the first lens unit U1. At the same time, telephoto at the wide-angle end becomes difficult. More preferably, conditional expression (11) should be set as follows.
1.50 <fw / φ <4.00 (11a)

  If the lower limit value of conditional expression (12) is not reached, the telephoto lens becomes too telephoto at the wide-angle end, making it difficult to achieve a high zoom ratio. In each embodiment, the number of lenses constituting the first lens unit U1 is preferably 6 to 9. If the number of lenses is further increased, it is difficult to reduce the size and weight of the first lens unit U1. On the other hand, if the number of lenses is further reduced, the refractive power of each lens constituting the first lens unit U1 becomes too strong. Therefore, various chromatic aberrations and distortions at the wide angle side in the first lens unit U1, spherical aberrations at the telephoto end, etc. Many aberrations occur, and it becomes difficult to correct these aberrations.

  In each embodiment, when focusing from infinity to a short distance, focus adjustment is performed by driving a partial group F of the first lens unit U1 toward the object side. For example, in a 5-group zoom lens, focus adjustment can also be performed in the third and fourth lens groups on the image side of the zoom system and the third lens group on the image side of the zoom system in the 4-group zoom lens. However, it is not preferable because the photographing magnification changes during focus adjustment.

  In each embodiment, the aperture stop SP and the lens group on the image side of the aperture stop SP do not move during zooming. As a result, the F number up to the F drop point (F drop position) at which the F number increases during zooming is kept constant.

  Next, the lens configuration of each example will be described. The lens configuration of each lens group in Example 1 will be described. Hereinafter, it is assumed that the lenses are arranged in order from the object side to the image side. The first lens unit U1 includes three positive lenses, two negative lenses, and two positive lenses. The sixth positive lens and the seventh positive lens counted from the object side constitute a focusing subgroup F.

  The second lens unit U2 includes two negative lenses, a cemented lens in which a positive lens and a negative lens are cemented, and a positive lens. The third lens unit U3 includes a cemented lens in which a negative lens and a positive lens are cemented. The fourth lens unit U4 includes a positive lens. The fifth lens unit U5 includes a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a negative lens, and a cemented lens in which a positive lens and a negative lens are cemented. It consists of

  Next, the lens configuration of each lens group in Example 2 will be described. The lens configurations of the first lens unit U1 and the second lens unit U2 are the same as those in the first embodiment. The third lens unit U3 includes a cemented lens obtained by cementing a negative lens and a positive lens, and a negative lens. The lens configuration of the fourth lens unit U4 is the same as that of the first embodiment. The fifth lens unit U5 includes a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a negative lens, and a cemented lens in which a positive lens and a negative lens are cemented. It is composed of a negative lens.

  Next, the lens configuration of each lens unit of Example 3 will be described. The first lens unit U1 includes a positive lens, a cemented lens in which a negative lens and a positive lens are cemented, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, and a cemented lens in which a positive lens and a negative lens are cemented. The focusing sub-group F is composed of a fourth lens which is counted from the object side, and a cemented lens obtained by cementing the fifth positive lens and the sixth negative lens.

  The second lens unit U2 includes a negative lens, a cemented lens obtained by cementing a positive lens and a negative lens, a positive lens, and a negative lens. The third lens unit U3 includes a cemented lens in which a negative lens and a positive lens are cemented. The fourth lens unit U4 includes two positive lenses, a cemented lens in which a positive lens and a negative lens are cemented, a negative lens, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, and a cemented lens in which a negative lens and a positive lens are cemented. The lens is composed of a cemented lens in which a positive lens and a negative lens are cemented.

  Next, the lens configuration of each lens unit of Example 4 will be described. The first lens unit U1 includes a positive lens, a negative lens, a positive lens, a positive lens, and a cemented lens obtained by cementing a positive lens and a negative lens. The focusing sub-group F is composed of a fourth lens which is counted from the object side, and a cemented lens obtained by cementing the fifth positive lens and the sixth negative lens.

  The second lens unit U2 includes a negative lens, a cemented lens obtained by cementing a positive lens and a negative lens, a negative lens, and a positive lens. The third lens unit U3 includes a cemented lens in which a negative lens and a positive lens are cemented. The fourth lens unit U4 includes two positive lenses, a cemented lens in which a positive lens and a negative lens are cemented, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, and a positive lens. And a negative lens and a positive lens.

  Next, the lens configuration of each lens unit of Example 5 will be described. The first lens unit U1 includes three positive lenses, two negative lenses, a positive lens, a cemented lens in which a negative lens and a positive lens are cemented, and a positive lens. A focusing sub-group F is constituted by the sixth positive lens, the cemented lens obtained by cementing the seventh negative lens and the eighth positive lens, and the ninth positive lens, counting from the object side.

  The second lens unit U2 includes two negative lenses, a cemented lens in which a positive lens and a negative lens are cemented, and a positive lens. The third lens unit U3 includes a cemented lens obtained by cementing a negative lens and a positive lens, and a negative lens. The fourth lens unit U4 includes a positive lens. The fifth lens unit U5 includes a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, two negative lenses, and a cemented lens in which a positive lens and a negative lens are cemented. A positive lens, and a cemented lens in which a positive lens and a negative lens are cemented.

  Next, the lens configuration of each lens unit of Example 6 will be described. The lens configurations of the first lens group U1 and the second lens group U2 are the same as those in the first embodiment. The third lens unit U3 includes a cemented lens obtained by cementing a negative lens and a positive lens, and a negative lens. The fourth lens unit U4 includes a positive lens. The fifth lens unit U5 includes a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, a positive lens, a negative lens, and a cemented lens in which a positive lens and a negative lens are cemented. A positive lens and a negative lens.

  Next, the lens configuration of each lens unit in Example 7 will be described. The lens configurations of the first lens unit U1 and the second lens unit U2 are the same as those in the third embodiment. The third lens unit U3 includes a negative lens. The fourth lens unit U4 includes a cemented lens in which a negative lens and a positive lens are cemented. The lens configuration of the fifth lens unit U5 is the same as that of the fourth lens unit U4 of Example 3.

  As described above, according to each embodiment, it is possible to obtain a zoom lens having a large aperture ratio and a high zoom ratio, the entire system being small and light, and having high optical performance in the entire zoom range.

  Next, an outline of an imaging apparatus (television camera system) using the zoom lens of each embodiment as an imaging optical system will be described with reference to FIG. FIG. 21 is a schematic diagram of a main part of the imaging apparatus of the present invention. In FIG. 21, reference numeral 101 denotes any one zoom lens of Examples 1 to 7. Reference numeral 123 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 123. Reference numeral 124 denotes an image pickup apparatus configured by attaching the zoom lens 101 to the camera 123.

  The zoom lens 101 includes a first lens unit U1, a zooming system LZ, a focal length conversion optical system (extender) FDC, and a rear lens unit R. The first lens unit U1 includes a focusing subgroup F. The zooming system LZ includes a lens group that moves on the optical axis for zooming and a lens group that moves on the optical axis for correcting image plane fluctuations accompanying zooming. An aperture stop SP is provided between the zoom system LZ and the rear lens group R. The rear lens group R includes a front relay group FR, a focal length conversion optical system FDC, and a rear relay group RR that are stationary during zooming.

  Reference numeral 115 denotes a driving mechanism such as a helicoid, a cam, or an actuator that drives the zooming system LZ in the optical axis direction. Reference numerals 116 and 117 denote motors (drive means) for electrically driving the drive mechanism 115 and the aperture stop SP. Reference numerals 118 and 119 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the position on the optical axis of the zooming system LZ and the aperture diameter of the aperture stop SP. In the camera 123, 109 is a glass block corresponding to an optical filter or color separation prism in the camera 123, and 110 is an imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. It is.

  Reference numerals 111 and 120 denote CPUs that control various types of driving of the camera 123 and the zoom lens body 101. Thus, by applying the zoom lens of the present invention to a television camera, an imaging device having high optical performance is realized.

  Numerical data of Examples 1 to 7 according to the present invention are shown below. In numerical data, 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 i-th and i + 1-th interval from the object side, and ndi and νdi are the first The refractive index and the Abbe number of the i-th optical member. The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, and A16 are set as aspheric coefficients, and are expressed by the following equations.

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

  The focal length, the F number, and the angle of view (degree) indicate when the object is focused on infinity. BF is the back focus, and is indicated by the distance from the final lens surface to the image plane. Each lens group data represents the focal length of each lens group, the length on the optical axis (lens configuration length), the front principal point position, and the rear principal point position. Further, the portion where the interval d between the optical surfaces is (variable) changes during zooming, and the surface interval corresponding to the focal length is shown in the separate table. Table 1 shows the parameters based on the numerical data and the calculation results of the conditional expressions.

<Example 1>
Surface number rd nd νd Effective diameter
1 138.223 23.17 1.43875 94.9 150.00
2 962.006 0.50 148.51
3 136.513 18.73 1.43875 94.9 140.32
4 530.784 0.50 137.72
5 129.871 15.48 1.43875 94.9 126.56
6 425.729 6.00 123.19
7 1477.767 3.50 1.72916 54.7 119.55
8 83.035 14.21 104.55
9 220.075 3.50 1.69680 55.5 104.25
10 156.448 16.85 102.56
11 * 102.974 14.29 1.43875 94.9 102.34
12 783.351 2.48 101.50
13 170.812 9.39 1.43875 94.9 98.01
14 -4872.567 (variable) 97.06
15 -1859.011 1.50 1.88300 40.8 36.69
16 48.052 7.60 34.93
17 -59.368 1.50 1.43875 94.9 34.93
18 -215.184 3.93 35.56
19 -78.515 3.46 1.85026 32.3 36.06
20 -48.867 1.50 1.43875 94.9 36.70
21 52.898 2.34 38.31
22 59.028 4.18 1.85026 32.3 39.81
23 158.693 (variable) 39.81
24 -101.388 1.50 1.81600 46.6 40.44
25 145.731 3.51 1.84666 23.8 41.95
26 -959.833 (variable) 42.46
27 192.281 7.33 1.51633 64.1 46.19
28 -67.238 (variable) 46.63
29 (Aperture) ∞ 2.00 46.63
30 100.018 6.62 1.49700 81.5 46.63
31 -315.983 0.20 46.15
32 61.903 11.98 1.49700 81.5 44.52
33 -66.813 1.50 2.00330 28.3 42.51
34 825.245 25.02 41.70
35 -194.686 6.04 1.51633 64.1 35.51
36 -56.942 10.01 35.07
37 -555.514 6.03 1.84666 23.8 28.58
38 -31.643 1.50 1.88300 40.8 28.28
39 40.911 2.93 27.66
40 47.970 5.48 1.51633 64.1 29.09
41 -156.625 36.51 29.34
42 -125.846 1.50 1.80 100 35.0 31.23
43 -180.651 3.31 31.48
44 136.211 5.66 1.80518 25.4 32.04
45 -56.226 1.50 1.95906 17.5 31.93
46 -356.003 51.90 31.95
Image plane ∞

Aspheric data 11th surface
K = 0.00000e + 000 A 4 = -1.97669e-008 A 6 = -5.45415e-014
A 8 = 9.81056e-018 A10 = 6.25284e-020

Various data Zoom ratio 7.00
Wide angle Medium Tele focal length 75.00 200.00 525.00
F number 3.40 3.40 3.50
Half angle of view (degrees) 10.65 4.03 1.54
Image height 14.10 14.10 14.10
Total lens length 441.92 441.92 441.92
BF 51.90 51.90 51.90

d14 2.00 53.47 82.29
d23 83.06 16.92 6.28
d26 10.00 22.18 2.80
d28 0.20 2.69 3.90

Entrance pupil position 284.82 664.86 1315.72
Exit pupil position -167.52 -167.52 -167.52
Front principal point position 334.18 682.56 584.61
Rear principal point position -23.10 -148.10 -473.09

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 215.06 128.61 44.78 -80.51
2 15 -38.83 26.01 1.68 -19.55
3 24 -144.12 5.01 -0.38 -3.10
4 27 97.06 7.33 3.61 -1.26
5 29 149.33 127.79 41.00 -111.00

<Example 2>
Surface data surface number rd nd νd Effective diameter
1 444.996 9.22 1.43875 94.9 123.07
2 -1309.330 0.80 122.77
3 184.946 12.51 1.43875 94.9 120.74
4 1659.959 1.12 119.62
5 114.735 17.90 1.43875 94.9 113.11
6 3430.837 3.71 110.93
7 -4554.605 5.00 1.65160 58.5 108.14
8 89.590 14.46 97.72
9 588.115 4.80 1.69680 55.5 97.60
10 237.357 15.60 96.79
11 103.244 19.54 1.43875 94.9 99.49
12 -379.425 0.20 98.59
13 116.621 8.02 1.43875 94.9 92.23
14 220.938 (variable) 90.32
15 * -278.876 1.60 1.77250 49.6 45.89
16 49.551 8.96 43.57
17 -103.215 1.60 1.43875 94.9 43.88
18 -252.175 0.76 44.68
19 306.111 6.90 1.72047 34.7 45.49
20 -66.169 1.60 1.43875 94.9 45.71
21 87.876 0.18 45.65
22 52.222 3.44 1.65412 39.7 46.25
23 65.904 (variable) 45.71
24 -50.339 1.80 1.71700 47.9 45.75
25 -304.562 5.44 1.80518 25.4 48.60
26 -91.644 2.03 49.89
27 -71.556 1.60 1.71700 47.9 50.20
28 -127.740 (variable) 51.95
29 200.000 7.81 1.51633 64.1 55.92
30 -92.936 (variable) 56.31
31 117.239 9.87 1.51633 64.1 57.02
32 -144.123 1.00 56.59
33 68.062 12.58 1.43875 94.9 52.86
34 -95.438 1.80 2.00100 29.1 50.83
35 -391.263 20.01 49.92
36 (Aperture) ∞ 4.00 38.21
37 33.961 6.58 1.43875 94.9 33.47
38 77.275 3.54 30.77
39 -187.301 6.93 1.95906 17.5 29.53
40 -44.717 1.80 2.00100 29.1 27.77
41 31.973 17.03 25.69
42 123.358 10.48 1.51633 64.1 34.52
43 -32.832 16.70 35.83
44 -45.667 1.80 1.71700 47.9 32.90
45 -76.228 3.98 33.59
46 70.408 7.44 1.68893 31.1 34.18
47 -80.684 1.80 2.00100 29.1 33.61
48 1451.643 2.00 33.37
49 28.598 2.92 1.80518 25.4 32.59
50 26.167 40.00 30.76
Image plane ∞

Aspheric data 15th surface
K = 0.00000e + 000 A 4 = 4.26759e-007 A 6 = 4.46098e-010
A 8 = -2.56120e-012 A10 = 1.52896e-015 A12 = 2.07223e-017
A14 = -5.41349e-020 A16 = 3.95875e-023

Various data Zoom ratio 4.00
Wide angle Medium Telephoto focal length 80.00 158.11 320.00
F number 2.60 2.60 2.60
Half angle of view (degrees) 10.00 5.10 2.52
Image height 14.10 14.10 14.10
Total lens length 417.72 417.72 417.72
BF 40.00 40.00 40.00

d14 4.16 43.84 70.28
d23 53.11 22.70 10.25
d28 22.56 19.33 1.50
d30 9.03 2.99 6.83

Entrance pupil position 253.60 495.25 967.60
Exit pupil position -96.71 -96.71 -96.71
Front principal point position 286.79 470.50 538.62
Rear principal point position -40.01 -118.11 -279.99

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 190.00 112.88 55.15 -50.35
2 15 -62.00 25.05 -0.19 -19.15
3 24 -101.16 10.87 -1.45 -8.54
4 29 123.56 7.81 3.55 -1.65
5 31 121.93 132.25 38.31 -114.79

<Example 3>
Surface data surface number rd nd νd Effective diameter
1 132.557 7.20 1.48749 70.2 101.36
2 268.496 1.00 100.85
3 122.109 4.00 1.72047 34.7 99.41
4 87.345 17.20 1.43875 94.9 95.67
5 27820.602 7.23 94.66
6 123.441 8.92 1.43875 94.9 87.17
7 827.012 0.18 85.98
8 105.527 13.16 1.49700 81.5 80.35
9 -686.925 2.50 1.72047 34.7 77.00
10 311.050 11.40 73.16
11 -192010.000 7.62 1.80809 22.8 63.59
12 -142.469 2.20 1.72047 34.7 61.35
13 145.072 (variable) 56.51
14 31.793 1.00 2.00330 28.3 23.07
15 17.784 6.33 21.05
16 109.426 4.19 1.80809 22.8 19.77
17 -28.825 0.90 1.88300 40.8 19.26
18 34.679 1.39 18.78
19 22.904 4.33 1.84666 23.8 19.38
20 57.551 2.61 18.54
21 -52.389 0.90 1.88300 40.8 18.28
22 123.316 (variable) 18.35
23 -42.870 0.90 1.71700 47.9 18.91
24 49.463 2.20 1.84666 23.8 19.81
25 470.622 (variable) 20.14
26 (Aperture) ∞ 1.31 33.05
27 181.223 4.29 1.61800 63.3 34.15
28 -71.107 0.25 34.48
29 43.919 7.38 1.61800 63.3 34.95
30 -115.487 0.15 34.26
31 44.126 6.78 1.48749 70.2 31.33
32 -69.563 1.00 1.80610 33.3 29.71
33 130.374 4.95 28.11
34 -89.378 1.00 1.88300 40.8 25.85
35 67.668 37.98 25.21
36 45.464 4.99 1.49700 81.5 23.24
37 -46.019 1.13 22.82
38 105.148 3.65 1.48749 70.2 20.93
39 -41.966 0.80 1.88300 40.8 20.03
40 -623.906 2.50 19.54
41 -81.711 0.80 1.83481 42.7 18.74
42 56.762 2.48 1.60342 38.0 18.62
43 -190.205 1.99 18.60
44 98.865 5.32 1.64769 33.8 18.38
45 -22.025 1.00 1.88300 40.8 18.02
46 -96.609 5.00 18.03
47 ∞ 33.00 1.60859 46.4 40.00
48 ∞ 13.20 1.51680 64.2 40.00
49 ∞ 10.01 40.00
Image plane ∞

Various data Zoom ratio 20.00
Wide angle Medium Telephoto focal length 33.00 150.00 660.00
F number 2.80 2.80 6.51
Half angle of view (degrees) 9.46 2.10 0.48
Image height 5.50 5.50 5.50
Total lens length 319.26 319.26 319.26
BF 44.23 44.23 44.23

d13 2.18 40.62 54.52
d22 48.73 4.36 22.26
d25 27.01 32.93 1.14

Entrance pupil position 217.74 860.61 2768.65
Exit pupil position -201.80 -201.80 -201.80
Front principal point position 245.60 904.38 1372.15
Rear principal point position -22.99 -139.99 -649.99

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 146.59 82.62 -17.14 -65.13
2 14 -19.00 21.65 7.81 -6.28
3 23 -62.78 3.10 0.11 -1.60
4 26 56.50 140.94 32.20 -126.95

<Example 4>
Surface data surface number rd nd νd Effective diameter
1 152.851 9.53 1.48749 70.2 99.66
2 1516.506 0.20 98.44
3 95.520 3.50 1.80000 29.8 90.51
4 74.190 1.00 85.89
5 76.506 13.36 1.43387 95.1 85.73
6 245.461 14.13 83.76
7 143.361 8.50 1.49700 81.5 74.86
8 1488.465 0.20 72.63
9 77.437 9.46 1.49700 81.5 67.36
10 253.217 2.40 1.72047 34.7 64.41
11 106.021 (variable) 61.03
12 * 89.643 1.20 1.88300 40.8 32.47
13 27.065 4.06 28.78
14 96.481 5.86 1.85478 24.8 28.13
15 -36.639 0.70 1.77250 49.6 27.00
16 63.630 3.74 24.98
17 -34.966 0.70 1.88300 40.8 24.97
18 1242.106 0.20 25.96
19 81.292 2.44 1.85478 24.8 26.77
20 1888.759 (variable) 27.01
21 -43.531 0.80 1.77250 49.6 27.37
22 149.925 2.11 1.92286 18.9 29.14
23 -731.671 (variable) 29.66
24 (Aperture) ∞ 1.84 35.58
25 1161.697 5.49 1.69680 55.5 37.19
26 -55.832 0.20 38.07
27 2162.444 4.38 1.58913 61.1 38.96
28 -85.157 0.20 39.25
29 151.689 7.86 1.49700 81.5 39.08
30 -43.768 1.20 2.00069 25.5 38.84
31 -180.309 0.20 39.60
32 44.306 8.15 1.51633 64.1 40.25
33 650.765 1.10 1.77250 49.6 39.27
34 102.968 5.72 38.64
35 108.188 4.63 1.48749 70.2 37.89
36 -187.188 24.37 37.48
37 65.420 7.31 1.84666 23.8 33.06
38 -44.483 0.90 1.88300 40.8 32.37
39 40.854 3.00 30.29
40 69.809 10.21 1.48749 70.2 30.51
41 -23.839 1.00 2.00100 29.1 30.32
42 -46.481 8.80 31.64
43 65.984 2.29 1.58913 61.1 31.70
44 77.324 44.00 31.35
Image plane ∞

Aspheric data 12th surface
K = 1.63630e + 001 A 4 = -3.62205e-006 A 6 = -5.20747e-009
A 8 = 2.31397e-011 A10 = -2.80295e-013 A12 = 1.56619e-015
A14 = -4.74613e-018 A16 = 5.54482e-021

Various data Zoom ratio 6.80
Wide angle Medium Telephoto focal length 50.00 130.00 340.00
F number 2.70 2.70 3.80
Half angle of view (degrees) 16.49 6.49 2.49
Image height 14.80 14.80 14.80
Total lens length 282.72 282.72 282.72
BF 44.00 44.00 44.00

d11 5.42 33.65 50.20
d20 43.21 10.84 4.90
d23 7.15 11.29 0.68

Entrance pupil position 147.59 343.69 629.97
Exit pupil position -84.66 -84.66 -84.66
Front principal point position 178.16 342.33 71.46
Rear principal point position -6.00 -86.00 -296.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 121.99 62.28 8.85 -37.26
2 12 -23.08 18.91 5.72 -7.13
3 21 -64.69 2.91 -0.16 -1.70
4 24 37.44 98.84 10.27 -70.51

<Example 5>
Surface data surface number rd nd νd Effective diameter
1 189.976 20.57 1.43875 94.9 149.91
2 -1285.334 0.80 148.64
3 150.353 18.47 1.43875 94.9 139.98
4 1113.563 1.12 137.96
5 124.548 16.49 1.43875 94.9 124.63
6 524.506 7.89 121.51
7 1693.942 5.00 1.65160 58.5 114.37
8 98.360 18.08 100.89
9 -552.055 4.80 1.69680 55.5 99.97
10 588.492 25.79 98.12
11 333.957 8.05 1.43875 94.9 92.01
12 -673.264 0.20 91.20
13 139.981 4.00 1.61340 44.3 87.55
14 88.942 11.04 1.43875 94.9 83.76
15 313.566 0.98 82.31
16 188.186 5.53 1.43875 94.9 80.92
17 364.543 (variable) 79.28
18 * 259.340 1.60 1.77250 49.6 30.62
19 37.129 9.16 28.36
20 -44.922 1.60 1.43875 94.9 27.53
21 -912.658 1.62 28.00
22 128.940 3.96 1.72047 34.7 28.44
23 -100.010 1.60 1.43875 94.9 28.45
24 59.958 1.95 28.24
25 48.658 3.56 1.65412 39.7 28.59
26 64.187 (variable) 28.13
27 -181.386 1.80 1.71700 47.9 28.33
28 33.577 5.90 1.72047 34.7 28.81
29 -166.788 2.13 28.97
30 -58.231 1.60 1.71700 47.9 28.99
31 -509.387 (variable) 29.70
32 134.181 7.56 1.51633 64.1 43.83
33 -79.083 (variable) 44.33
34 96.557 7.31 1.51633 64.1 44.32
35 -157.962 1.00 43.80
36 60.472 9.77 1.43875 94.9 41.33
37 -64.069 1.80 2.00100 29.1 39.86
38 -44566.879 6.05 39.12
39 (Aperture) ∞ 6.88 37.28
40 93.370 5.76 1.43875 94.9 34.70
41 -71.536 3.48 34.02
42 -249.116 4.78 1.95906 17.5 30.22
43 -49.685 1.80 2.00100 29.1 29.32
44 197.112 10.00 28.07
45 -194.325 1.67 1.51633 64.1 24.26
46 -1263.189 15.47 23.81
47 97.859 1.80 1.71700 47.9 23.25
48 28.566 6.74 22.86
49 66.047 7.09 1.68893 31.1 25.49
50 -26.500 1.80 2.00100 29.1 25.75
51 110.836 4.95 27.27
52 99.053 7.28 1.80518 25.4 31.81
53 -39.985 0.18 32.51
54 -58.388 5.56 1.80518 25.4 32.20
55 -27.270 1.80 1.95906 17.5 32.53
56 -59.927 55.01 33.67
Image plane ∞

Aspheric data 18th surface
K = 1.57706e + 002 A 4 = -6.34999e-007 A 6 = 3.05395e-008
A 8 = 1.42060e-010 A10 = -2.95257e-013 A12 = 3.30718e-016
A14 = -2.36679e-018 A16 = 1.31391e-020
A 3 = -2.24224e-009 A 5 = -1.05726e-007 A 7 = -3.64414e-009
A 9 = 3.76050e-012 A11 = -1.54364e-014 A13 = 1.11289e-016
A15 = -3.48986e-019

Various data Zoom ratio 7.97
Wide angle Medium telephoto focal length 90.00 256.51
F number 3.40 3.40 4.80
Half angle of view (degrees) 8.90 3.15 1.13
Image height 14.10 14.10 14.10
Total lens length 453.22 453.22 453.22
BF 55.01 55.01 55.01

d17 4.95 55.97 80.99
d26 47.04 4.72 7.98
d31 30.38 30.28 1.50
d33 10.04 1.44 1.95

Entrance pupil position 446.16 1143.18 2742.97
Exit pupil position -198.61 -198.61 -198.61
Front principal point position 504.22 1140.26 1431.52
Rear principal point position -34.99 -201.50 -662.30

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 246.00 148.81 21.74 -116.36
2 18 -42.85 25.04 3.17 -16.41
3 27 -95.03 11.43 4.83 -2.58
4 32 97.19 7.56 3.17 -1.87
5 34 144.39 112.96 81.98 -102.34

<Example 6>
Surface data surface number rd nd νd Effective diameter
1 202.921 16.06 1.43875 94.9 125.08
2 -728.826 0.80 124.31
3 136.166 17.01 1.43875 94.9 118.16
4 1796.713 1.12 115.75
5 107.263 16.18 1.43875 94.9 105.02
6 962.903 3.57 101.71
7 1895.376 5.00 1.65160 58.5 97.93
8 101.272 13.24 87.45
9 -727.240 4.80 1.69680 55.5 86.24
10 116.881 21.08 82.34
11 119.162 13.45 1.43875 94.9 82.98
12 -345.757 0.20 82.26
13 132.761 8.01 1.43875 94.9 78.74
14 353.602 (variable) 76.79
15 * 61.569 1.60 1.77250 49.6 37.62
16 43.530 8.22 35.74
17 -76.477 1.60 1.43875 94.9 34.61
18 -353.541 2.19 34.20
19 5703.032 3.99 1.72047 34.7 33.60
20 -146.814 1.60 1.43875 94.9 33.19
21 48.963 2.38 32.30
22 47.687 3.44 1.65412 39.7 32.71
23 54.445 (variable) 32.15
24 -98.462 1.80 1.71700 47.9 32.81
25 57.042 5.06 1.80518 25.4 33.92
26 -326.585 3.03 34.23
27 -59.824 1.60 1.71700 47.9 34.41
28 -634.463 (variable) 35.79
29 200.000 7.38 1.51633 64.1 51.63
30 -82.795 (variable) 52.05
31 102.704 8.65 1.51633 64.1 52.93
32 -127.098 1.00 52.63
33 66.477 11.66 1.43875 94.9 49.05
34 -88.499 1.80 2.00100 29.1 47.03
35 -635.490 15.49 46.10
36 (Aperture) ∞ 7.14 38.20
37 33.509 6.23 1.43875 94.9 32.56
38 75.833 6.62 30.18
39 -317.2 6.22 1.95906 17.5 26.32
40 -58.839 1.80 2.00100 29.1 24.56
41 31.492 18.09 22.87
42 152.540 8.02 1.51633 64.1 33.32
43 -30.966 8.47 33.97
44 -38.233 1.80 1.71700 47.9 32.14
45 -84.291 4.00 33.16
46 304.776 7.22 1.68893 31.1 34.33
47 -37.266 1.80 2.00100 29.1 34.49
48 -96.496 2.00 35.44
49 126.179 4.39 1.80518 25.4 35.71
50 -255.138 0.19 35.47
51 47.734 3.00 1.80518 25.4 34.29
52 35.990 40.01 32.45
Image plane ∞

Aspheric data 15th surface
K = 0.00000e + 000 A 4 = 1.40918e-007 A 6 = 8.60141e-010
A 8 = -4.63893e-012 A10 = 6.60125e-015 A12 = 3.66734e-017
A14 = -1.40375e-019 A16 = 1.38895e-022

Various data Zoom ratio 5.00
Wide angle Medium Telephoto focal length 100.00 220.24 500.00
F number 2.60 2.60 4.00
Half angle of view (degrees) 8.03 3.66 1.62
Image height 14.10 14.10 14.10
Total lens length 413.05 413.05 413.05
BF 40.01 40.01 40.01

d14 2.94 43.20 66.55
d23 37.13 11.83 13.02
d28 32.91 25.78 1.50
d30 10.03 2.21 1.95

Entrance pupil position 405.94 845.40 1821.66
Exit pupil position -162.53 -162.53 -162.53
Front principal point position 456.56 826.15 1087.35
Rear principal point position -59.99 -180.23 -459.99

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 219.88 120.53 32.02 -85.65
2 15 -65.26 25.02 10.57 -8.99
3 24 -69.45 11.49 4.32 -3.30
4 29 114.00 7.38 3.47 -1.44
5 31 122.64 125.60 78.92 -119.12

<Example 7>
Surface data surface number rd nd νd Effective diameter
1 133.692 7.07 1.48749 70.2 102.41
2 265.458 0.80 101.64
3 124.241 4.00 1.72047 34.7 100.31
4 86.019 17.53 1.43875 94.9 96.36
5 8094.909 8.73 95.42
6 142.118 7.93 1.43875 94.9 88.11
7 920.220 6.89 87.08
8 109.702 12.11 1.49700 81.5 77.61
9 -884.398 2.50 1.72047 34.7 74.48
10 299.619 15.85 71.14
11 -1576.789 6.67 1.80809 22.8 58.65
12 -120.744 2.20 1.72047 34.7 57.03
13 151.020 (variable) 52.95
14 30.562 1.00 2.00330 28.3 25.30
15 21.577 4.15 23.60
16 52.497 4.85 1.80809 22.8 22.43
17 -38.686 0.90 1.88300 40.8 21.25
18 25.359 1.26 19.13
19 19.804 2.57 1.84666 23.8 18.73
20 35.005 2.85 17.90
21 -62.257 0.90 1.88300 40.8 17.18
22 56.132 (variable) 16.76
23 134.110 0.90 1.71700 47.9 16.45
24 64.384 (variable) 16.48
25 -27.036 0.90 1.71700 47.9 16.81
26 38.087 2.04 1.84666 23.8 18.18
27 596.462 (variable) 18.53
28 (Aperture) ∞ 0.96 32.44
29 175.807 5.65 1.53775 74.7 33.67
30 -40.761 0.25 34.07
31 63.446 5.77 1.61800 63.3 34.52
32 -82.739 0.15 34.24
33 46.379 7.49 1.48749 70.2 31.53
34 -43.944 1.00 1.80610 33.3 30.26
35 -7329.939 3.54 28.98
36 -85.462 1.00 1.88300 40.8 27.38
37 110.533 37.87 26.88
38 52.599 4.45 1.49700 81.5 22.84
39 -50.009 0.88 22.43
40 107.990 2.43 1.48749 70.2 20.85
41 -206.150 0.80 1.88300 40.8 20.09
42 106.179 1.72 19.58
43 78.280 0.80 1.83481 42.7 18.72
44 15.214 3.74 1.60342 38.0 17.61
45 94.979 1.98 17.46
46 122.277 3.91 1.64769 33.8 17.41
47 -45.039 1.00 1.88300 40.8 17.22
48 -133.868 5.00 17.20
49 ∞ 33.00 1.60859 46.4 40.00
50 ∞ 13.20 1.51680 64.2 40.00
51 ∞ 10.01 40.00
Image plane ∞

Various data Zoom ratio 22.00
Wide angle Medium Telephoto focal length 40.00 180.31 880.00
F number 2.80 2.80 8.62
Half angle of view (degrees) 7.83 1.75 0.36
Image height 5.50 5.50 5.50
Total lens length 319.40 319.40 319.40
BF 44.23 44.23 44.23

d13 7.19 43.63 57.80
d22 40.56 3.36 13.19
d24 5.05 5.12 3.36
d27 22.39 23.08 0.83

Entrance pupil position 329.97 1131.69 3486.03
Exit pupil position -154.40 -154.40 -154.40
Front principal point position 360.24 1114.26 -343.94
Rear principal point position -29.99 -170.30 -869.99

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 167.28 92.28 -28.86 -80.60
2 14 -21.03 18.48 10.62 -2.35
3 23 -172.79 0.90 1.01 0.49
4 25 -40.71 2.94 0.02 -1.60
5 28 44.26 136.58 20.45 -116.40

U1 1st lens group U2 2nd lens group U3 3rd lens group U4 4th lens group U5 5th lens group SP Aperture stop LZ Zooming system R Rear lens group F Subgroup

Claims (19)

In order from the object side to the image side, a first lens group having a positive refractive power that does not move during zooming, a zooming system including two or more lens groups that move during zooming, and a rear lens group, and adjacent lens groups during zooming A zoom lens in which the interval of
The zooming system has, in order from the object side to the image side, a second lens unit having a negative refractive power that moves during zooming, and a third lens group having a negative refractive power that moves during zooming, from the wide-angle end to the telephoto end. The second lens group moves toward the image side during zooming, and has an aperture stop closer to the image side than the second lens group,
The focal lengths of the first lens group and the second lens group are f1 and f2, respectively, the imaging magnification of the second lens group at the wide angle end is β2w, and the light of the first lens group and the second lens group at the wide angle end. When the interval on the axis is L12w, and the length on the optical axis from the lens surface closest to the image side of the first lens group at the wide angle end to the aperture stop is L1Sw,
2.8 <| f1 / f2 | <10.0
β2w <3.50 × 10 ⁻³ × | f1 / f2 | ³ −8.49 × 10 ⁻² × | f1 / f2 | ² + 6.90 × 10 ⁻¹ × | f1 / f2 | −2.22
| L12w / L1Sw | <0.10
A zoom lens characterized by satisfying the following conditional expression: When the imaging magnification at the telephoto end of the second lens group is β2t,
4.00 <| β2t / β2w | <600.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the focal length of the third lens group is f3,
0.70 <| f1 / f3 | <6.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   4. The zoom lens according to claim 1, wherein the third lens unit moves along a locus convex toward the object side during zooming from the wide-angle end to the telephoto end. 5. When the length on the optical axis from the most object side lens surface to the most image side lens surface at the wide angle end is DTw,
1.40 <DTw / f1 <2.20
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the length on the optical axis from the image side principal point position of the first lens group to the object side principal point position of the second lens group at the wide angle end is H12w,
0.15 <H12w / f1 <0.75
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the thickness on the optical axis of the first lens group is D1, and the length from the most image-side lens surface of the first lens group to the image-side principal point position of the first lens group is H1k,
−0.95 <H1k / D1 <−0.30
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the thickness on the optical axis of the second lens group is D2, and the length from the most object side lens surface of the second lens group to the object side principal point position of the second lens group is H21,
-0.10 <H21 / D2 <0.70
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the thickness on the optical axis of the first lens group is D1,
1.30 <f1 / D1 <2.20
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   The zoom lens according to any one of claims 1 to 9, wherein the first lens group includes 6 to 9 lenses.   The zoom lens according to any one of claims 1 to 10, wherein a partial group of the first lens group is moved during focusing.   The zoom lens according to any one of claims 1 to 11, wherein the aperture stop and the lens group on the image side of the aperture stop are not moved during zooming.   13. The zoom lens according to claim 1, wherein the zooming system includes a fourth lens unit having a positive refractive power that moves to the image side of the third lens unit during zooming.   The zoom lens according to any one of claims 1 to 12, wherein the zooming system includes a fourth lens unit having a negative refractive power that moves to the image side of the third lens unit during zooming.   The zoom lens according to claim 1, wherein the aperture stop is disposed on an image side of the variable magnification system.   The zoom lens according to claim 1, wherein the aperture stop is disposed between lenses of a plurality of lenses constituting the rear lens group.   The zoom lens according to any one of claims 1 to 16, wherein the rear lens group includes a lens group having a positive refractive power that does not move during zooming.   An image pickup apparatus comprising: the zoom lens according to claim 1; and an image pickup element that receives an image formed by the zoom lens. When the focal length of the entire system at the wide angle end is fw, the zoom ratio of the entire system is Z, and the diagonal length of the image size of the image sensor is φ,
1.40 <fw / φ
3.0 <Z
The zoom lens according to claim 18, wherein the following conditional expression is satisfied.