JP6429758B2 - Zoom lens and imaging apparatus having the same - Google Patents

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and is suitable for an image pickup optical system used in, for example, a broadcast television camera, a movie camera, a video camera, a digital still camera, a silver salt photograph camera, and the like.

  2. Description of the Related Art Conventionally, there has been a demand for a zoom lens having high optical performance over an entire zoom range and a wide object distance ranging from infinity to a short distance with a compact and lightweight, high zoom ratio, and an imaging optical system used in an imaging apparatus. In addition, an imaging device such as a CCD or CMOS used in an imaging apparatus such as a television / movie camera as a professional moving image imaging system has a high resolution with a substantially uniform imaging range. For this reason, the zoom lens used in this moving image capturing system is required to have a high resolving power and a substantially uniform resolving power over the entire screen from the center of the screen to the periphery of the screen.

  As a zoom lens satisfying these requirements, a positive lead type zoom lens in which a lens group having a positive refractive power is disposed closest to the object side is known (Patent Documents 1 and 2).

  In Patent Document 1, 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 or negative refractive power, and a first lens group having a positive refractive power. A zoom lens composed of four lens groups is disclosed. The second lens unit and the third lens unit move during zooming. The first lens unit includes, in order from the object side to the image side, an eleventh partial group U11 having a negative refractive power, a twelfth group having a positive refractive power, and a thirteenth group having a positive refractive power. The group is moving.

  In Patent Document 2, 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 fourth lens having a positive refractive power. A zoom lens including a lens group and a fifth lens group having a positive refractive power is disclosed. The second lens group and the fourth lens group move during zooming. The fourth lens group is moved during focusing.

  In addition, in Patent Document 2, 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 positive refractive power. A zoom lens composed of a fourth lens group is disclosed. The second lens group and the fourth lens group move during zooming. The fourth lens group is moved during focusing.

JP-A-6-242378 JP 2007-316288 A

  The positive lead type zoom lens described above is relatively easy to achieve a high zoom ratio while reducing the size of the entire system. In a positive lead type zoom lens, it is important to set each element of the zoom lens appropriately in order to obtain high optical performance over the entire object distance while ensuring miniaturization of the entire system and high zoom ratio. It becomes.

  For example, it is important to appropriately set the zoom type (the number of lens groups and the sign of the refractive power of each lens group), the focusing method, and the like. In particular, in order to reduce aberration fluctuations associated with focusing and to obtain high optical performance over the entire object distance, it is important to select the focusing lens group (focus lens group) and to set the lens configuration of the focus lens group appropriately. It becomes.

  If these configurations are not appropriate, the entire system becomes large when a high zoom ratio is achieved, and fluctuations in various aberrations associated with zooming and focusing increase, resulting in high optical performance over the entire zoom range and overall object distance. Becomes very difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens and an image pickup apparatus having the zoom lens in which the entire optical system is small, has a high zoom ratio, and can easily obtain high optical performance over the entire zoom range and the entire object distance.

The zoom lens according to the present invention includes 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 positive refractive power in order from the object side to the image side. A zoom lens including a fourth lens group and a fifth lens group having a positive or negative refractive power, wherein an interval between adjacent lens groups is changed during zooming, the image side of the second lens group or the third lens An aperture stop is provided on the image side of the group, and the first lens group has an eleventh partial group having a negative refractive power that does not move during focusing, a twelfth partial group having a positive refractive power that moves during focusing, and a positive positive lens that does not move during focusing. Consisting of a thirteenth partial group of
The eleventh partial group includes, in order from the object side to the image side, a negative 111th lens, a negative 112th lens, and a positive 113th lens. The radius of curvature of the lens surface on the object side of the 112th lens is G112R1. The radius of curvature of the image side lens surface of the 112th lens is G112R2, the distance on the optical axis from the most object side lens surface to the aperture stop at the wide angle end is Lsp, and from the most object side lens surface at the wide angle end. When the distance on the optical axis to the lens surface closest to the image is L,
-0.5 <(G112R1 + G112R2) / (G112R1-G112R2) <2.0
0.1 <Lsp / L <0.6
It satisfies the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens and an image pickup apparatus having the zoom lens in which the entire optical system is small, has a high zoom ratio, and easily obtains high optical performance over the entire zoom range and the entire object distance.

Cross section of the zoom lens of Example 1 when focusing on an object at infinity at the wide angle end (A), (B), (C) Aberration diagrams when focusing on an object at infinity at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 1. Sectional view of the zoom lens of Example 2 when focusing on an object at infinity at the wide-angle end (A), (B), (C) Aberration diagrams when focusing on an object at infinity at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 2. Cross section of the zoom lens of Example 3 when focusing on an object at infinity at the wide angle end (A), (B), (C) Aberration diagrams when focusing on an object at infinity at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 3 Cross section of the zoom lens of Example 4 when focusing on an object at infinity at the wide-angle end (A), (B), (C) Aberration diagrams when focusing on an object at infinity at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 4. Cross section of the zoom lens of Example 5 when focusing on an object at infinity at the wide angle end (A), (B), (C) Aberration diagrams when focusing on an object at infinity at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 5 Explanatory drawing of the light ray which passes the 1st lens group in each Example Explanatory drawing of the 11th partial group of each embodiment Schematic diagram of main parts of an imaging apparatus of the present invention

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, features of the lens configuration of the zoom lens of the present invention will be described.

  The zoom lens of the present invention includes the following lens groups 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, a fourth lens group having a positive refractive power, and a positive or negative refractive power. It is composed of a fifth lens group. The distance between adjacent lens units changes during zooming.

  An aperture stop is provided on the image side of the second lens group or on the image side of the third lens group. The first lens group includes an eleventh partial group having negative refractive power that does not move during focusing, a twelfth partial group having positive refractive power that moves during focusing, and a thirteenth partial group having positive refractive power that does not move during focusing. Yes.

  FIG. 1 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end (focal length: f = 18.00 mm) of the zoom lens according to Embodiment 1 of the present invention. 2A, 2B, and 2C show the wide angle end (focal length: f = 18.00 mm), the intermediate zoom position (focal length: f = 34.90 mm), and the telephoto end (first embodiment). It is an aberration diagram when focusing on an object at infinity at a focal length: f = 80.00 mm. The first embodiment is a zoom lens having a zoom ratio of 4.44, an F number of 4.00, and an imaging field angle of 81.64 degrees at the wide angle end.

  However, the focal length is a value when numerical data of an example described later is expressed in mm. This is the same in all the following embodiments.

  FIG. 3 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (focal length: f = 16.00 mm) of the zoom lens according to the second embodiment of the present invention. 4A, 4 </ b> B, and 4 </ b> C are the wide-angle end (focal length: f = 16.00 mm), the intermediate zoom position (focal length: f = 25.00 mm), and the telephoto end (of Example 2). It is an aberration diagram when focusing on an object at infinity at a focal length: f = 45.00 mm. Example 2 is a zoom lens having a zoom ratio of 2.81, an F number of 2.80, and an imaging field angle of 88.36 degrees at the wide angle end.

  FIG. 5 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (focal length: f = 20.00 mm) of the zoom lens according to Embodiment 3 of the present invention. FIGS. 6A, 6B, and 6C show the wide-angle end (focal length: f = 20.00 mm), the intermediate zoom position (focal length: f = 38.00 mm), and the telephoto end of Example 3 (focal length: f = 20.00 mm). It is an aberration diagram when focusing on an object at infinity at a focal length: f = 90.00 mm. The third exemplary embodiment is a zoom lens having a zoom ratio of 4.50, an F number of 4.00, and an imaging field angle of 75.74 degrees at the wide angle end.

  FIG. 7 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (focal length: f = 22.00 mm) of the zoom lens according to the fourth embodiment of the present invention. 8A, 8B, and 8C show the wide angle end (focal length: f = 22.00 mm), the intermediate zoom position (focal length: f = 70.00 mm), and the telephoto end (focal length) of Example 4. It is an aberration diagram when focusing on an object at infinity at a focal length: f = 220.00 mm. Example 4 is a zoom lens having a zoom ratio of 10.00, an F number of 4.00 to 6.99, and an imaging field angle of 70.5 degrees at the wide angle end.

  FIG. 9 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (focal length: f = 24.00 mm) of the zoom lens of Example 5 of the present invention. FIGS. 10A, 10B, and 10C show the wide angle end (focal length: f = 24.00 mm), the intermediate zoom position (focal length: f = 53.00 mm), and the telephoto end of Example 5 (focal length: f = 24.00 mm). It is an aberration diagram when focusing on an object at infinity at a focal length: f = 110.00 mm. The fifth exemplary embodiment is a zoom lens having a zoom ratio of 4.58, an F number of 5.60, and an imaging field angle of 65.88 degrees at the wide angle end.

  FIG. 11 is an explanatory diagram of light rays passing through the first lens group and the second lens group of the zoom lens of the present invention. FIG. 12 is an explanatory diagram of an eleventh partial group of the zoom lens according to the present invention. FIG. 13 is a schematic view of the main part of the imaging apparatus of the present invention.

  In the lens cross-sectional views of each example, the left side is the object side and the right side is the image side. In the lens cross-sectional views of Examples 1 to 5, L0 is a zoom lens. U1 is a first lens unit having a positive refractive power that does not move during zooming. The first lens unit U1 includes, in order from the object side to the image side, an eleventh partial group U11 having a negative refractive power that does not move during focusing, a twelfth partial group U12 that has a positive refractive power that moves during focusing, and a positive refractive that does not move during focusing. It is composed of a thirteenth partial group U13 of force. U2 is a second lens unit having a negative refractive power that moves during zooming, and moves to the image side during zooming from the wide-angle end to the telephoto end.

  U3 is a third lens unit having a positive refractive power that moves during zooming. U4 is a fourth lens unit having a positive refractive power that moves during zooming. U5 is a fifth lens unit having positive or negative refractive power that does not move during zooming, and has an imaging function. SP is a stop (aperture stop), and is disposed on the object side of the third lens unit U3 or on the object side of the fourth lens unit U4. I is an image pickup surface, which corresponds to the image pickup surface of a solid-state image pickup device (photoelectric conversion device) that receives an image formed by a zoom lens and performs photoelectric conversion.

  In each embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 move along different paths during zooming. In the zoom lens of the present invention, each aberration diagram uses the e-line (wavelength 546.1 nm) as a reference wavelength. In the aberration diagrams, the solid line, the two-dot chain line, the one-dot chain line, and the dotted line in the spherical aberration are the e-line, g-line, C-line, and F-line, respectively. A dotted line and a solid line in astigmatism are a meridional image plane and a sagittal image plane in the e-line, respectively. The lateral chromatic aberration is represented by a g-line (two-dot chain line), a C-line (one-dot chain line), and an F-line (dotted line).

  ω is an imaging half angle of view (degree), and Fno is an F number. The spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 10%, and the lateral chromatic aberration is drawn on a scale of 0.1 mm. In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the zoom lens unit (second lens unit U2) is located at both ends of the mechanism movable on the optical axis. In a positive lead type zoom lens, the focusing method for focusing with the first lens group or a part thereof is a simple mechanism because the amount of movement during focusing is constant in the entire zoom range from the wide-angle end to the telephoto end. And it has excellent operability.

  FIG. 11 is an explanatory diagram of a light beam passing through the first lens unit U1 in the zoom lens of the present invention. The figure shows that the first lens unit U1 is composed of three subgroups: an eleventh subgroup U11 having a negative refractive power, a twelfth subgroup U12 having a positive refractive power, and a thirteenth subgroup U13 having a positive refractive power. ing. Then, the twelfth partial group U12 is moved for focusing.

  In the figure, a light beam RL1 is an FNO light beam that determines the F number at the telephoto end. A light beam RL2 indicates a chief ray having a maximum field angle at the wide angle end. Here, in order to reduce the size of the first lens unit U1, as is apparent from the lower diagram of FIG. It is necessary to reduce the diameter. For this purpose, it is necessary to reduce the inclination of the principal ray RL2 having the maximum field angle from the thirteenth group U13 to the twelfth group U12.

  Alternatively, the rear principal point of the first lens unit U1 is positioned further rearward, the retro ratio of the first lens unit U1 is increased, the distance from the second lens unit U2 is decreased, and the incident height of the light beam is increased. Need to lower. Here, the retro ratio is an amount obtained by dividing the back focus when the light beam from infinity is incident on the target lens group by the focal length. In order to increase the retro ratio, it is necessary to increase the positive refractive power of the first lens unit U1. Then, the number of lenses in the first lens unit U1 increases for aberration correction, and the size of the first lens unit U1 increases.

  Therefore, in the zoom lens of the present invention, the first lens unit U1 is configured as follows to increase the retro ratio while reducing the number of lenses in the first lens unit U1. An eleventh partial group U11 having a negative refractive power that does not move during focusing from the object side to the image side in order from the object side to the image side, a twelfth partial group U12 having a positive refractive power that moves during focusing, and a positive refraction that does not move during focusing It consists of a thirteenth partial group U13 of force.

  Further, the eleventh partial group U11 includes, in order from the object side to the image side, a negative 111th lens U111, a negative 112th lens U112, and a positive 113th lens U113. The radius of curvature of the object-side lens surface of the 112th lens U112 is G112R1, and the radius of curvature of the image-side lens surface of the 112th lens U112 is G112R2. The distance on the optical axis from the most object side lens surface to the aperture stop SP at the wide angle end is Lsp, and the distance on the optical axis from the most object side lens surface to the most image side lens surface at the wide angle end is L. .

At this time,
-0.5 <(G112R1 + G112R2) / (G112R1-G112R2) <2.0
... (1)
0.1 <Lsp / L <0.6 (2)
The following conditional expression is satisfied.

  Next, the technical meaning of each conditional expression described above will be described. Conditional expressions (1) and (2) are for achieving a good optical performance while widening the angle of view and reducing the effective diameter of the first lens unit U1. Further, a condition for shortening the total lens thickness of the first lens unit U1 (the distance from the most object side lens surface of the first lens unit U1 to the most image side lens surface of the first lens unit U1) is defined. Yes. Conditional expression (1) is a condition for shortening the total lens thickness of the first lens unit U1 while favorably correcting various aberrations.

  Since the 112th lens U112 is a negative lens, the range of the conditional expression (1) defines that the lens surface on the object side is concave on the image side, and the refractive power of the lens surface on the image side is negative. It means big. As a result, as shown in FIG. 12A, the air gap between the 111th lens U111 and the 112th lens U112 is shortened compared to FIG. 12B, and the total lens thickness of the first lens unit U1 is shortened. ing.

  Further, the distance between the principal points of the 111th lens U111 and the 112th lens U112 is increased so that the negative refractive power of the 111th lens U111 can be weakened. Accordingly, aberration correction is facilitated and the peripheral portion of the 111st lens U111 is thinned to facilitate the reduction in size and weight of the first lens unit U1. Conditional expression (1) reduces the retro-ratio of the first lens unit U1 and the effective diameter of the first lens unit U1 becoming large when the negative refractive power of the 111th lens U111 becomes weak. .

  When the upper limit of conditional expression (1) is exceeded, a concave meniscus shape is formed on the image side where the refractive power of the object-side lens surface of the 112th lens U112 and the refractive power of the image-side lens surface are close. At this time, the negative refracting power of the 112th lens U112 becomes too weak, and the negative refracting power of the 111th lens U111 becomes strong, making it difficult to reduce the size while correcting aberrations. Alternatively, the refractive power of each lens surface of the 112th lens U112 becomes too strong, making it difficult to reduce the size while correcting aberrations.

  Conversely, if the lower limit of conditional expression (1) is exceeded, it will be difficult to increase the principal point interval, and the refractive power on the image side of the first lens unit U1 will become strong. It becomes difficult.

  Conditional expression (2) is a condition for reducing the effective diameter of the first lens unit U1 while favorably correcting various aberrations. Conditional expression (2) defines the position of the aperture stop SP with respect to the optical total length (distance from the most object side lens surface to the most image side lens surface). By positioning the aperture stop SP on the object side, the entrance pupil is pushed to the object side, and the incident height of the light beam incident on the first lens unit U1 of the off-axis principal ray RL2 in FIG. 11 is lowered. The effective diameter of the first lens unit U1 is reduced.

  If the upper limit of conditional expression (2) is exceeded, the position of the aperture stop SP will be located closer to the object side, and it will be difficult to secure a large amount of movement of the moving lens group for zooming. Conversely, if the lower limit of conditional expression (2) is exceeded, the entrance pupil position will be located on the image side, and it will be difficult to reduce the size of the first lens unit U1. More preferably, the numerical ranges of the conditional expressions (1) and (2) are set as follows.

0.0 ≦ (G112R1 + G112R2) / (G112R1-G112R2) <1.2
... (1a)
0.50 <Lsp / L <0.60 (2a)
For one or more of the conditional expressions (1a) to (2a), only the upper limit value or the lower limit value may be replaced with the corresponding value of the conditional expressions (1) to (2). .

  In each embodiment, it is preferable to satisfy one or more of the following conditional expressions. The focal length of the 111th lens U111 is f111, and the focal length of the 112th lens U112 is f112. The focal length of the eleventh partial group U11 is f11, the combined focal length of the 111th lens U111 and the 112th lens U112 is f11na, and the focal length of the 113th lens U113 is f113. The average value of the Abbe number of the material of the 111st lens U111 and the Abbe number of the material of the 112th lens U112 is ν11na, and the Abbe number of the material of the 113th lens U113 is ν113.

  The distance on the optical axis from the most object-side lens surface vertex of the first lens unit U1 to the most image-side lens surface vertex of the first lens unit U1 is L1. At this time, it is preferable to satisfy one or more of the following conditional expressions.

0.4 <f111 / f112 <1.0 (3)
−5.0 <f113 / f11 <−1.0 (4)
0.5 <f11na / f11 <0.8 (5)
20.0 <ν11na−ν113 <35.0 (6)
0.25 <L1 / L <0.50 (7)

  Next, the technical meaning of each conditional expression described above will be described. Conditional expression (3) relates to the ratio of the focal lengths of the 111th lens U111 and the 112th lens U112 in the 11th partial group U11, and achieves a reduction in size and weight of the first lens group U1 while mainly performing aberration correction favorably. The conditions for this are stipulated.

  If the lower limit of conditional expression (3) is exceeded, the negative refracting power of the 111th lens U111 becomes too strong (the absolute value of the negative refracting power becomes too large), and the first lens unit U1 necessary for aberration correction is required. It is necessary to increase the number of lenses, and it is difficult to shorten the total lens thickness of the first lens unit U1. Conversely, when the upper limit of conditional expression (3) is exceeded, the negative refractive power of the 111st lens U111 becomes too weak, the retro ratio of the first lens unit U1 becomes small, and it becomes difficult to reduce the effective diameter.

  Conditional expressions (4) and (5) define the focal length of the positive lens and the negative lens included in the eleventh subgroup U11, so that the aberration of the first lens group U1 can be reduced while favorably correcting aberrations. Defines the conditions for achieving weight reduction.

  If the upper limit of conditional expression (4) is exceeded, the radius of curvature of each lens in the eleventh subgroup U11 becomes small in order to obtain a sufficient wide-angle effect, making it difficult to correct high-order aberrations and to reduce size and weight. It becomes. Conversely, when the lower limit of conditional expression (4) is exceeded, the retro ratio of the eleventh subgroup U11 decreases, and the effective diameter of the eleventh subgroup U11 increases. Alternatively, as the retro ratio is decreased, the distance on the optical axis between the eleventh partial group U11 and the twelfth partial group U12 is increased, and the total lens thickness of the first lens group is increased.

  When the upper limit of conditional expression (5) is exceeded, the retro ratio of the eleventh subgroup U11 is reduced, and the effective diameter of the eleventh subgroup U11 is increased. Alternatively, the distance on the optical axis between the eleventh partial group U11 and the twelfth partial group U12 is increased by the reduction of the retro ratio, and the total lens thickness of the first lens group U1 is increased. On the other hand, if the lower limit of conditional expression (5) is exceeded, the negative refractive power of the negative lens of the eleventh subgroup U11 becomes relatively strong, and the higher order due to the decrease in the radius of curvature of the negative refractive lens. Aberrations increase, and it becomes difficult to reduce the size and weight of the first lens unit U1 and to obtain good optical performance.

  Conditional expression (6) defines the range of chromatic aberration correction in the eleventh subgroup U11. When the upper limit of conditional expression (6) is exceeded, achromaticity becomes excessive, the refractive power of each lens of the eleventh subgroup U11 becomes insufficient, and it becomes difficult to provide sufficient retro ratio and aberration correction capability. On the other hand, when the lower limit of conditional expression (6) is exceeded, the radius of curvature of each lens becomes small, and it becomes difficult to obtain a small size and light weight and good optical performance of the first lens unit U1.

  Conditional expression (7) relates to the distance (lens total length) from the most object-side lens surface vertex of the first lens unit U1 to the most image-side lens surface vertex. When the upper limit of conditional expression (7) is exceeded, the total lens thickness of the first lens unit U1 having a large effective diameter becomes longer, so that the lens weight increases and it becomes difficult to reduce the size and weight of the first lens unit U1. . Conversely, if the lower limit of conditional expression (7) is exceeded, it will be difficult to increase the retro ratio of the first lens unit U1, and it will be difficult to increase the angle of view and reduce the size of the first lens unit U1.

More preferably, the numerical ranges of the conditional expressions (3) to (7) are set as follows.
0.55 <f111 / f112 <0.95 (3a)
-4.8 <f113 / f11 <-1.6 (4a)
0.55 <f11na / f11 <0.78 (5a)
23.0 <ν11na−ν113 <31.0 (6a)
0.27 <L1 / L <0.40 (7a)

  For one or more of the conditional expressions (3a) to (7a) described above, only the upper limit value or the lower limit value may be replaced with the corresponding value of the conditional expressions (3) to (7). . Next, the lens configuration of the zoom lens of each embodiment will be described.

[Example 1]
The lens configuration of the zoom lens of Example 1 will be specifically described with reference to FIG. In FIG. 1, U1 is a first lens unit having positive refractive power that does not move during zooming. U2 is a second lens unit having a negative refractive power that moves during zooming. The second lens unit U2 monotonously moves on the optical axis to the image plane side during zooming from the wide-angle end to the telephoto end. SP is an aperture stop.

  U3 is a third lens unit having a positive refractive power, which moves on the optical axis from the object side to the image side from the wide-angle end to the zoom middle, and moves on the optical axis from the image side to the object side from the middle zoom to the telephoto end. To do. That is, the third lens unit U3 moves along a locus convex toward the image side. U4 is a fourth lens unit having a positive refractive power, and moves on the optical axis from the image side to the object side during zooming from the wide-angle end to the telephoto end. U5 is a fifth lens unit having positive refractive power that does not move during zooming. I is an imaging surface.

  The first lens unit U1 includes an eleventh partial group U11 having negative refractive power, a second partial group U12 having positive refractive power for focusing, and a thirteenth partial group U13 having positive refractive power. The twelfth sub-group U12 performs focusing (focusing) from infinity to a short distance by extending from the object side to the image side. Hereinafter, the lens surfaces constituting each lens group are counted in order from the object side to the image side, and the i-th lens surface is referred to as the i-th surface.

  In numerical data to be described later, the first lens unit U1 corresponds to the first surface to the fourteenth surface. The eleventh partial group U11 corresponds to the first surface to the sixth surface, and includes two negative lenses and one positive lens. The twelfth partial group U12 corresponds to the seventh surface and the eighth surface, and is composed of one positive lens. The thirteenth partial group U13 corresponds to the ninth surface to the fifteenth surface, and includes three positive lenses and one negative lens.

  The second lens unit U2 corresponds to the sixteenth to twenty-second surfaces, and is composed of three negative lenses and one positive lens. The third lens unit U3 corresponds to the 24th to 28th surfaces, and is composed of one negative lens and two positive lenses. The fourth lens unit U4 corresponds to the 29th to 32nd surfaces, and is composed of one negative lens and one positive lens. The fifth lens unit U5 corresponds to the 33rd to 42nd surfaces, and is composed of three negative lenses and three positive lenses. The first surface and the 24th surface are aspherical, and mainly correct distortion and astigmatism variations during zooming.

[Example 2]
The lens configuration of the zoom lens of Example 2 will be specifically described with reference to FIG. In the zoom lens of Example 2, the zoom configuration, such as the number of lens groups, the sign of the refractive power of each lens group, and the movement conditions of each lens group during zooming, is the same as that of Example 1. In the zoom lens of the second embodiment, the focus configuration such as the number of partial groups of the first lens unit U1, the sign of the refractive power of each partial group, and the movement conditions of the partial groups during focusing are the same as in the first embodiment.

  In numerical data to be described later, the first lens unit U1 corresponds to the first surface to the twelfth surface. The eleventh partial group U11 corresponds to the first surface to the sixth surface, and includes two negative lenses and one positive lens. The twelfth partial group U12 corresponds to the seventh surface to the eleventh surface, and is composed of one negative lens and two positive lenses. The thirteenth partial group U13 corresponds to the twelfth surface and the thirteenth surface and is composed of one positive lens.

  The second lens unit U2 corresponds to the 14th to 20th surfaces, and is composed of three negative lenses and one positive lens. The third lens unit U3 corresponds to the 22nd to 24th surfaces, and is composed of one negative lens and one positive lens. The fourth lens unit U4 corresponds to the 25th to 27th surfaces, and is composed of one negative lens and one positive lens. The fifth lens unit U5 corresponds to the 28th to 37th surfaces, and is composed of two negative lenses and four positive lenses. The first surface and the 24th surface are aspherical, and mainly correct distortion and astigmatism variations during zooming.

[Example 3]
The lens configuration of the zoom lens of Example 3 will be specifically described with reference to FIG. In FIG. 5, U1 is a first lens unit having positive refractive power that does not move during zooming. U2 is a second lens unit having a negative refractive power for zooming. The second lens unit U2 monotonously moves on the optical axis to the image plane side during zooming from the wide-angle end to the telephoto end.

  U3 is a third lens unit having a positive refractive power, and moves on the optical axis from the object side to the image side during zooming from the wide-angle end to the telephoto end. SP is an aperture stop. U4 is a fourth lens unit having a positive refractive power, and moves on the optical axis from the image side to the object side during zooming from the wide-angle end to the telephoto end. U5 is a fifth lens unit having negative refractive power that does not move during zooming. I is an imaging surface. The focus configuration such as the number of partial groups of the first lens unit U1, the sign of the refractive power of each partial group, and the movement conditions of the partial groups during focusing are the same as in the first embodiment.

  In numerical data to be described later, the first lens unit U1 corresponds to the first to fifteenth surfaces. The eleventh partial group U11 corresponds to the first surface to the sixth surface, and includes two negative lenses and one positive lens. The twelfth partial group U12 corresponds to the seventh surface and the eighth surface, and is composed of one positive lens. The thirteenth partial group U13 corresponds to the ninth to fifteenth surfaces and is composed of one negative lens and three positive lenses.

  The second lens unit U2 corresponds to the sixteenth to nineteenth surfaces and is composed of two negative lenses. The third lens unit U3 corresponds to the 20th to 23rd surfaces, and is composed of one negative lens and one positive lens. The fourth lens unit U4 corresponds to the 25th to 32nd surfaces and is composed of one negative lens and three positive lenses. The fifth lens unit U5 corresponds to the 33rd to 40th surfaces, and includes three negative lenses and two positive lenses. The first surface and the twenty-fifth surface have aspherical shapes, and mainly correct distortion and astigmatism variations during zooming.

[Example 4]
The lens configuration of the zoom lens of Example 4 will be specifically described with reference to FIG. In FIG. 7, U1 is a first lens unit having a positive refractive power that does not move during zooming. U2 is a second lens unit having a negative refractive power that moves during zooming. The second lens unit U2 monotonously moves on the optical axis to the image plane side during zooming from the wide-angle end to the telephoto end. SP is an aperture stop. U3 is a third lens unit having a positive refractive power, which moves on the optical axis from the object side to the image side from the wide-angle end to the zoom middle, and moves on the optical axis from the image side to the object side from the middle zoom to the telephoto end. To do.

  U4 is a fourth lens unit having a positive refractive power, and moves on the optical axis from the image side to the object side during zooming from the wide-angle end to the telephoto end. U5 is a fifth lens unit having negative refractive power that does not move during zooming. I is an imaging surface. In the zoom lens of Embodiment 4, the focus configuration, such as the number of subgroups of the first lens unit U1, the sign of the refractive power of each subgroup, and the movement conditions of the subgroups during focusing, is the same as that of Embodiment 1.

  In numerical data to be described later, the first lens unit U1 corresponds to the first to fifteenth surfaces. The eleventh partial group U11 corresponds to the first surface to the sixth surface, and includes two negative lenses and one positive lens. The twelfth partial group U12 corresponds to the seventh surface and the eighth surface, and is composed of one positive lens. The thirteenth partial group U13 corresponds to the ninth to fifteenth surfaces and is composed of one negative lens and three positive lenses.

  The second lens unit U2 corresponds to the sixteenth to twenty-second surfaces, and is composed of three negative lenses and one positive lens. The third lens unit U3 corresponds to the 24th to 25th surfaces and is composed of one positive lens. The fourth lens unit U4 corresponds to the 26th to 30th surfaces, and is composed of one negative lens and two positive lenses. The fifth lens unit U5 corresponds to the 31st to 36th surfaces, and is composed of two negative lenses and two positive lenses. The sixteenth and twenty-fifth surfaces are aspherical, and mainly correct distortion and astigmatism variations during zooming.

[Example 5]
The lens configuration of the zoom lens of Example 5 will be specifically described with reference to FIG. In the zoom lens of Example 5, the zoom configuration, such as the number of lens groups, the sign of the refractive power of each lens group, and the moving conditions of each lens group during zooming, is the same as that of Example 4. In the zoom lens of Example 5, the focus configuration such as the number of subgroups of the first lens unit U1, the sign of the refractive power of each subgroup, and the movement conditions of the subgroups during focusing are the same as in Example 1.

  In numerical data to be described later, the first lens unit U1 corresponds to the first to thirteenth surfaces. The eleventh partial group U11 corresponds to the first surface to the sixth surface, and includes two negative lenses and one positive lens. The twelfth partial group U12 corresponds to the seventh surface and the eighth surface, and is composed of one positive lens. The thirteenth partial group U13 corresponds to the ninth to thirteenth surfaces and is composed of one negative lens and two positive lenses.

  The second lens unit U2 corresponds to the 14th to 20th surfaces, and is composed of three negative lenses and one positive lens. The third lens unit U3 corresponds to the 22nd surface and the 23rd surface, and is composed of one positive lens. The fourth lens unit U4 corresponds to the 24th to 28th surfaces, and is composed of one negative lens and two positive lenses. The fifth lens unit U5 corresponds to the 29th to 33rd surfaces and includes two negative lenses and one positive lens. The 14th and 23rd surfaces are aspherical, and mainly correct distortion and astigmatism variations during zooming.

  As described above, according to each embodiment, the refractive power arrangement of each lens group, the movement locus of the zoom moving lens group, and the like are appropriately defined. As a result, a zoom lens that achieves high operability, small size and light weight while achieving a high zoom ratio and good optical performance is obtained.

  FIG. 13 is a schematic diagram of a main part of an image pickup apparatus (television camera system) using the zoom lenses of Examples 1 to 5 as an image pickup optical system. In FIG. 13, reference numeral 101 denotes a zoom lens according to any one of Embodiments 1 to 5. Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. An imaging apparatus 125 is configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 includes a first lens group F, a zoom unit LZ, and an Nth lens group R for image formation. The first lens group F includes partial groups U11 to U13 that move a part of the lens groups for focusing.

  The zoom unit LZ includes a second lens unit U2, a third lens unit U3, and a fourth lens unit U4 that move on the optical axis for zooming. SP is an aperture stop. Reference numerals 114 and 115 denote a driving mechanism such as a focusing group and a helicoid or cam that drives the zoom unit LZ in the optical axis direction.

  Reference numerals 116 to 118 denote motors (drive means) that electrically drive the drive mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photo sensor for detecting the position on the optical axis of the focusing group and the zoom unit LZ and the aperture diameter of the aperture stop 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 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.

  Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens 101. Thus, by applying the zoom lens of the present invention to a television camera, an imaging device having high optical performance is realized.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  Numerical data corresponding to the embodiments of the present invention will be shown below. In each 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, ndi, νdi is the refractive index and Abbe number of the material of the i-th optical member. BF is the back focus from the final lens surface to the image plane. The total lens length is a value obtained by adding the back focus BF to the distance from the first lens surface to the final lens surface.

The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, A4, A6, A8, A10, A12, When A14 and A16 are respectively aspherical coefficients, they are expressed by the following equations. “E-Z” means “× 10 ^−Z ”. Table 1 shows the corresponding values between the above-described conditional expressions and numerical data.

<Example 1>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 * 158.655 2.29 1.77250 49.6 57.67
2 32.044 12.47 46.95
3 -224.706 1.70 1.77250 49.6 46.32
4 64.264 4.21 44.71
5 61.905 4.87 1.85478 24.8 45.42
6 257.039 4.00 44.99
7 -208.019 4.49 1.59522 67.7 44.32
8 -71.105 9.84 44.00
9 67.627 1.40 1.85478 24.8 37.96
10 36.154 6.33 1.43875 94.9 36.63
11 698.018 0.20 36.96
12 76.023 3.77 1.49700 81.5 37.72
13 -955.749 0.20 37.77
14 61.772 5.51 1.59522 67.7 37.90
15 -135.544 (variable) 37.65
16 -157.652 0.90 1.81600 46.6 21.40
17 24.443 3.68 20.25
18 -46.063 0.90 1.72916 54.7 20.37
19 -1020.053 0.20 21.16
20 43.510 3.92 1.85478 24.8 22.35
21 -61.198 0.90 1.81600 46.6 22.48
22 74.070 (variable) 22.72
23 (Aperture) ∞ (Variable) 23.69
24 * 59.229 3.48 1.58313 59.4 24.80
25 581.482 0.26 25.09
26 91.871 3.26 1.65 160 58.5 25.31
27 -91.293 1.20 1.74950 35.3 25.35
28 231.082 (variable) 25.43
29 55.690 1.20 2.00069 25.5 25.79
30 37.080 1.00 25.63
31 37.527 5.84 1.48749 70.2 26.53
32 -49.772 (variable) 26.88
33 196.819 1.20 1.85 150 40.8 27.29
34 56.055 0.69 27.21
35 39.053 3.18 1.95906 17.5 27.81
36 124.776 1.20 1.85478 24.8 27.54
37 37.093 4.86 26.98
38 49.198 5.01 1.59522 67.7 28.45
39 -72.271 1.84 28.41
40 55.654 6.17 1.43875 94.9 27.00
41 -33.801 1.20 1.95375 32.3 26.35
42 179.157 47.81 26.26
Image plane ∞

Aspheric data 1st surface
K = -4.72061e + 001 A 4 = 2.52766e-006 A 6 = 5.74589e-010
A 8 = -6.44759e-012 A10 = 1.70955e-014 A12 = -2.42858e-017
A14 = 1.77814e-020 A16 = -5.25165e-024

24th page
K = -2.82949e + 000 A 4 = -2.38192e-006 A 6 = 2.30170e-009
A 8 = -3.19640e-011 A10 = 2.15366e-013 A12 = -5.00417e-016

Various data Zoom ratio 4.44
Wide angle Medium Telephoto focal length 18.00 34.90 80.00
F number 4.00 4.00 4.00
Half angle of view (degrees) 40.82 24.02 11.00
Image height 15.55 15.55 15.55
Total lens length 231.59 231.59 231.59
BF 47.81 47.81 47.81

d15 0.99 19.02 30.29
d22 32.46 14.43 3.16
d23 1.41 7.79 1.41
d28 30.30 15.30 1.30
d32 5.26 13.88 34.27

Entrance pupil position 32.04 42.58 51.09
Exit pupil position -102.00 -79.95 -57.48
Front principal point position 47.87 67.94 70.31
Rear principal point position 29.81 12.91 -32.19

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 40.04 61.28 42.98 31.25
2 16 -21.80 10.49 1.30 -5.90
3 23 ∞ 0.00 0.00 -0.00
4 24 85.03 8.20 -0.52 -5.56
5 29 72.22 8.03 4.25 -1.34
6 33 3014.01 25.36 -303.07 -290.95

<Example 2>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 * 177.482 2.35 1.77250 49.6 64.94
2 31.214 15.22 50.44
3 1290.308 1.90 1.69680 55.5 48.47
4 44.223 7.23 45.02
5 51.011 5.12 1.85478 24.8 46.04
6 79.663 2.11 45.23
7 116.264 7.14 1.61800 63.3 45.26
8 -130.728 3.95 44.96
9 62.046 1.50 1.85478 24.8 41.79
10 30.739 8.18 1.49700 81.5 39.28
11 1128.212 4.72 38.97
12 69.613 5.28 1.69680 55.5 36.40
13 -95.177 (variable) 35.89
14 -95.926 1.00 1.83481 42.7 21.97
15 39.516 2.33 21.59
16 -325.594 1.00 1.58913 61.1 21.77
17 76.034 2.41 22.18
18 -56.822 1.00 1.43875 94.9 22.43
19 53.910 4.31 1.85478 24.8 24.11
20 -254.444 (variable) 24.79
21 (Aperture) ∞ (Variable) 26.18
22 41.524 1.00 1.61772 49.8 27.69
23 31.250 4.42 1.58313 59.4 27.62
24 * 1120.230 (variable) 27.59
25 67.773 1.15 2.00069 25.5 27.80
26 45.347 6.15 1.48749 70.2 27.46
27 -62.911 (variable) 27.37
28 3258.057 3.64 1.95906 17.5 26.58
29 -43.144 1.15 2.00100 29.1 26.69
30 60.877 6.73 27.09
31 -77.691 2.76 1.48749 70.2 29.69
32 -46.344 0.20 30.62
33 43.527 7.84 1.59522 67.7 33.95
34 -60.882 0.20 33.93
35 67.526 8.99 1.49700 81.5 32.19
36 -34.755 1.30 2.00069 25.5 30.74
37 331.094 39.99 30.53
Image plane ∞

Aspheric data 1st surface
K = 3.76090e + 000 A 4 = 2.06896e-006 A 6 = 2.75133e-010
A 8 = -1.74958e-012 A10 = 2.46546e-015 A12 = -1.61429e-018
A14 = 4.30176e-022 A16 = -5.15263e-027

24th page
K = -1.64665e + 004 A 4 = 5.84957e-006 A 6 = -2.47419e-009
A 8 = 4.37099e-012

Various data Zoom ratio 2.81
Wide angle Medium telephoto focal length 16.00 25.00 45.00
F number 2.80 2.80 2.80
Half angle of view (degrees) 44.18 31.88 19.06
Image height 15.55 15.55 15.55
Total lens length 220.02 220.02 220.02
BF 39.99 39.99 39.99

d13 1.01 14.60 25.23
d20 27.45 13.86 3.23
d21 7.05 8.09 1.45
d24 20.36 11.81 3.67
d27 1.87 9.39 24.17

Entrance pupil position 31.03 36.30 40.82
Exit pupil position -145.46 -116.54 -88.84
Front principal point position 45.65 57.31 70.10
Rear principal point position 23.99 14.99 -5.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 42.24 64.69 45.63 39.33
2 14 -28.02 12.05 0.18 -8.98
3 21 ∞ 0.00 0.00 -0.00
4 22 75.00 5.42 -0.19 -3.59
5 25 90.00 7.30 2.72 -2.07
6 28 168.15 32.81 18.41 -1.40

<Example 3>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 * 176.890 2.29 1.77250 49.6 62.57
2 34.297 15.70 51.35
3 -154.893 1.70 1.75500 52.3 50.62
4 145.540 1.94 50.30
5 66.217 5.19 1.80809 22.8 51.27
6 216.955 2.54 50.92
7 429.636 4.59 1.59522 67.7 50.56
8 -134.830 8.19 50.33
9 75.696 1.40 1.85478 24.8 44.71
10 40.148 7.10 1.43875 94.9 42.78
11 927.117 0.20 42.50
12 121.317 3.72 1.49700 81.5 41.95
13 -260.102 0.20 41.62
14 105.642 4.35 1.61800 63.3 39.97
15 -135.913 (variable) 39.49
16 80.065 1.00 2.00 100 29.1 27.20
17 28.542 4.50 24.84
18 -58.030 1.00 1.77250 49.6 24.56
19 177.126 (variable) 23.97
20 48.868 3.36 1.84666 23.8 22.41
21 -96.960 1.30 22.45
22 -36.621 1.00 1.53775 74.7 22.41
23 87.183 (variable) 22.85
24 (Aperture) ∞ (Variable) 23.59
25 * 124.261 4.68 1.59522 67.7 24.16
26 -61.364 7.89 24.82
27 111.142 1.20 1.95375 32.3 25.77
28 41.377 1.00 25.60
29 41.279 3.90 1.49700 81.5 26.19
30 -363.703 0.20 26.36
31 482.971 4.91 1.49700 81.5 26.44
32 -28.838 (variable) 26.53
33 -26.251 2.00 1.91082 35.3 22.09
34 -27.018 8.96 22.80
35 185.086 2.73 1.95906 17.5 21.32
36 -56.140 1.20 1.78470 26.3 21.15
37 27.385 19.00 20.43
38 35.650 7.48 1.43875 94.9 27.14
39 -38.143 1.20 1.95375 32.3 27.08
40 -105.322 34.35 27.58
Image plane ∞

Aspheric data 1st surface
K = -4.26498e + 000 A 4 = 3.69843e-007 A 6 = 9.50114e-010
A 8 = -2.62388e-012 A10 = 5.15834e-015 A12 = -5.81454e-018
A14 = 3.39437e-021 A16 = -7.97543e-025

25th page
K = -5.53776e + 001 A 4 = -7.80282e-006 A 6 = -1.04302e-008
A 8 = -1.47914e-011

Various data Zoom ratio 4.50
Wide angle Medium Telephoto focal length 20.00 38.00 90.00
F number 4.00 4.00 4.00
Half angle of view (degrees) 37.87 22.25 9.80
Image height 15.55 15.55 15.55
Total lens length 235.02 235.02 235.02
BF 34.35 34.35 34.35

d15 1.11 20.71 42.01
d19 6.08 3.01 2.83
d23 39.64 23.11 2.00
d24 13.43 7.66 1.78
d32 2.80 8.56 14.44

Entrance pupil position 37.79 51.27 70.55
Exit pupil position -99.02 -84.77 -76.88
Front principal point position 54.79 77.15 87.73
Rear principal point position 14.35 -3.65 -55.65

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 60.05 59.10 50.08 37.34
2 16 -23.77 6.50 2.63 -2.76
3 20 152.93 5.66 -8.09 -11.25
4 24 ∞ 0.00 0.00 -0.00
5 25 36.07 23.77 12.97 -8.11
6 33 -105.59 42.57 -4.90 -46.52

<Example 4>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 804.683 3.20 1.77250 49.6 74.51
2 63.042 13.88 65.63
3 -216.520 2.70 1.77250 49.6 64.61
4 188.432 0.29 63.71
5 100.018 5.31 1.89286 20.4 63.89
6 465.338 1.23 63.56
7 502.979 7.07 1.59522 67.7 63.09
8 -118.391 10.90 62.51
9 806.714 2.10 1.85478 24.8 51.72
10 58.402 7.97 1.49700 81.5 49.64
11 -328.574 0.20 49.44
12 78.176 7.17 1.48749 70.2 48.06
13 -170.706 0.20 47.37
14 72.857 4.46 1.76385 48.5 43.33
15 572.192 (variable) 42.81
16 * -1998.000 1.40 1.88300 40.8 29.87
17 29.616 4.07 26.23
18 -530.908 1.20 1.59522 67.7 25.66
19 28.272 4.31 1.85478 24.8 24.07
20 -337.191 3.03 23.41
21 -39.634 1.20 1.76385 48.5 22.92
22 417.246 (variable) 23.55
23 (Aperture) ∞ (Variable) 25.86
24 48.973 3.13 1.59522 67.7 31.58
25 * 106.865 (variable) 31.56
26 116.458 4.92 1.49700 81.5 34.16
27 -83.088 0.20 34.27
28 110.352 1.66 2.00069 25.5 33.85
29 57.654 5.34 1.49700 81.5 33.24
30 -101.992 (variable) 33.10
31 78.224 5.04 1.95906 17.5 29.43
32 -86.858 1.66 2.00069 25.5 28.81
33 38.807 4.82 27.52
34 43.234 8.36 1.43875 94.9 28.88
35 -27.466 1.87 1.88300 40.8 28.84
36 -57.347 44.92 29.89
Image plane ∞

Aspheric data 16th surface
K = -4.15372e + 004 A 4 = 1.58106e-006 A 6 = -4.35523e-010
A 8 = -6.81773e-013

25th page
K = 0.00000e + 000 A 4 = 3.55895e-006 A 6 = -1.14035e-010
A 8 = 3.47629e-014

Various data Zoom ratio 10.00
Wide angle Medium Telephoto focal length 22.00 70.00 220.00
F number 4.00 4.00 6.99
Half angle of view (degrees) 35.25 12.52 4.04
Image height 15.55 15.55 15.55
Total lens length 285.13 285.13 285.13
BF 44.92 44.92 44.92

d15 1.27 28.90 40.63
d22 40.96 13.32 1.60
d23 23.97 20.13 1.33
d25 29.42 15.44 1.29
d30 25.72 43.54 76.49

Entrance pupil position 50.53 87.93 111.01
Exit pupil position -274.13 -130.53 -86.82
Front principal point position 71.01 130.00 -36.37
Rear principal point position 22.92 -25.08 -175.08

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 60.55 66.67 50.12 20.27
2 16 -22.51 15.21 4.16 -6.28
3 23 ∞ 0.00 0.00 -0.00
4 24 148.35 3.13 -1.63 -3.55
5 26 65.97 12.12 3.41 -4.60
6 31 -320.34 21.75 -1.82 -17.59

<Example 5>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 97.408 2.85 1.77250 49.6 58.45
2 39.665 12.10 50.80
3 -218.512 2.38 1.77250 49.6 49.94
4 112.120 13.06 48.56
5 84.729 3.53 1.85478 24.8 48.04
6 177.049 1.17 47.56
7 113.091 6.49 1.59522 67.7 46.93
8 -130.872 8.36 46.24
9 60.916 1.90 1.85478 24.8 37.30
10 33.124 7.23 1.49700 81.5 35.02
11 448.865 0.19 33.95
12 49.160 5.32 1.61800 63.3 32.37
13 -3575.679 (variable) 30.73
14 * 167.293 1.33 1.88300 40.8 21.80
15 21.421 2.52 19.21
16 48.411 1.14 1.53775 74.7 18.49
17 18.886 2.96 1.85478 24.8 17.21
18 53.689 3.49 16.41
19 -26.840 1.14 1.53775 74.7 16.34
20 108.060 (variable) 16.86
21 (Aperture) ∞ (Variable) 17.35
22 38.688 2.84 1.58313 59.4 18.22
23 * 2287.345 (variable) 18.32
24 41.124 3.45 1.49700 81.5 18.55
25 -87.088 0.19 18.41
26 58.990 1.57 1.88300 40.8 18.11
27 21.693 3.85 1.49700 81.5 17.40
28 -93.061 (variable) 17.23
29 38.273 1.57 1.48749 70.2 17.67
30 24.395 9.13 17.45
31 -91.096 3.84 1.43875 94.9 19.02
32 -20.195 1.78 1.88300 40.8 19.42
33 -33.690 45.20 20.53
Image plane ∞

Aspheric data 14th surface
K = 1.42417e + 000 A 4 = 2.68815e-006 A 6 = -8.50488e-010
A 8 = 1.11865e-011

23rd page
K = 0.00000e + 000 A 4 = 7.73268e-006 A 6 = 1.71066e-009
A 8 = 5.90421e-012

Various data Zoom ratio 4.58
Wide angle Medium Telephoto focal length 24.00 53.00 110.00
F number 5.60 5.60 5.60
Half angle of view (degrees) 32.94 16.35 8.05
Image height 15.55 15.55 15.55
Total lens length 205.07 205.07 205.07
BF 45.20 45.20 45.20

d13 2.02 18.76 25.46
d20 25.03 8.29 1.59
d21 7.94 9.54 1.16
d23 15.09 6.55 0.95
d28 4.43 11.36 25.34

Entrance pupil position 45.08 61.77 68.99
Exit pupil position -63.33 -54.30 -44.65
Front principal point position 63.77 86.54 44.32
Rear principal point position 21.20 -7.80 -64.80

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 46.66 64.56 46.17 19.20
2 14 -18.89 12.58 4.59 -4.29
3 21 ∞ 0.00 0.00 -0.00
4 22 67.19 2.84 -0.03 -1.82
5 24 49.54 9.06 1.15 -4.83
6 29 -149.99 16.32 -2.66 -17.49

L0 Zoom lens U1 1st lens group U2 2nd lens group U3 3rd lens group U4 4th lens group U5 5th lens group U11 11th partial group U12 12th partial group U13 13th partial group

Claims (9)

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, a fourth lens group having a positive refractive power, A zoom lens including a fifth lens unit having a negative refractive power and having an interval between adjacent lens units that changes during zooming, and having an aperture stop on the image side of the second lens unit or the image side of the third lens unit The first lens group has an eleventh partial group having a negative refractive power that does not move during focusing, a twelfth partial group that has a positive refractive power that moves during focusing, and a thirteenth portion having a positive refractive power that does not move during focusing. Composed of groups,
The eleventh partial group includes, in order from the object side to the image side, a negative 111th lens, a negative 112th lens, and a positive 113th lens. The radius of curvature of the lens surface on the object side of the 112th lens is G112R1. The radius of curvature of the image side lens surface of the 112th lens is G112R2, the distance on the optical axis from the most object side lens surface to the aperture stop at the wide angle end is Lsp, and from the most object side lens surface at the wide angle end. When the distance on the optical axis to the lens surface closest to the image is L,
-0.5 <(G112R1 + G112R2) / (G112R1-G112R2) <2.0
0.1 <Lsp / L <0.6
A zoom lens satisfying the following conditional expression: When the focal length of the 111th lens is f111 and the focal length of the 112th lens is f112,
0.4 <f111 / f112 <1.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the focal length of the eleventh partial group is f11, the combined focal length of the 111th lens and the 112th lens is f11na, and the focal length of the 113th lens is f113,
−5.0 <f113 / f11 <−1.0
0.5 <f11na / f11 <0.8
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the average value of the Abbe number of the material of the 111th lens and the Abbe number of the material of the 112th lens is ν11na, and the Abbe number of the material of the 113th lens is ν113,
20.0 <ν11na−ν113 <35.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the distance on the optical axis from the most object side lens surface vertex of the first lens group to the most image side lens surface vertex of the first lens group is L1,
0.25 <L1 / L <0.50
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   6. The zoom lens according to claim 1, wherein during zooming, the second lens group, the third lens group, and the fourth lens group move along different trajectories.   During zooming from the wide-angle end to the telephoto end, the second lens group moves toward the image side, the third lens group moves along a locus convex toward the image side, and the fourth lens group moves toward the object side. The zoom lens according to claim 1, wherein the zoom lens is a zoom lens.   During zooming from the wide-angle end to the telephoto end, the second lens group moves toward the image side, the third lens group moves toward the image side, and the fourth lens group moves toward the object side. The zoom lens according to claim 1.   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup element that receives an image formed by the zoom lens.