JP6702797B2 - Zoom lens and imaging device - Google Patents

Description

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

2. Description of the Related Art In recent years, zoom lenses having a small optical size and a wide angle of view and a high zoom ratio and high optical performance have been demanded for image pickup apparatuses such as television cameras, movie cameras, and photographic cameras. In particular, an image pickup device such as a CCD or a CMOS used in a television/movie camera as a professional moving image shooting system has a substantially uniform resolution over the entire image pickup range. Therefore, a zoom lens using this is required to have a substantially uniform resolution from the center of the screen to the periphery of the screen. Moreover, when a wide-angle lens having a short focal length at the wide-angle end is used, a wide range can be photographed, and the perspective can be emphasized. Users who want to take advantage of the shooting effects are strongly demanding a wide-angle zoom lens with a wide angle, a high zoom ratio, a small size, a light weight, and high performance. On the other hand, in television shooting and movie shooting, there is a demand for highly accurate light amount adjustment, and there is a strong need for a manual diaphragm that mechanically changes the diaphragm diameter when the diaphragm ring is operated.

As a wide-angle zoom lens, there is known a negative lead type zoom lens in which a lens group having a negative refracting power is arranged on the most object side and which is composed of four or more lens groups as a whole. For example, in Patent Document 1, the zoom ratio is about 1.2, the angle of view at the wide-angle end is about 100° to 110°, and the negative first lens group, the positive second lens group, and the positive lens group are arranged in this order from the object side. A zoom lens having a third lens group and a rear group is disclosed. The first lens group does not move for zooming, but at least the second lens group and the third lens group move during zooming. In Patent Document 2, the zoom ratio is about 1.2, the angle of view at the wide-angle end is about 50°, and the negative first lens group, the positive second lens group, and the positive third lens are arranged in order from the object side. A zoom lens including a group, a negative fourth lens group, and a positive fifth lens group is disclosed.

JP 2008-304765 A JP 62-153913 A

However, in the zoom lens disclosed in Patent Document 1, the refracting power of each lens group and the lens configuration are disadvantageous for achieving both a wider angle and higher magnification, and the lens diameter increases with the widening of the angle. It becomes difficult to suppress the increase of the total length due to the increase of the magnification. In particular, when the angle of view at the wide-angle end exceeds 70 degrees and the variable power ratio exceeds 2, the tendency of increasing the lens diameter and increasing the moving amount of the variable power group becomes remarkable.

Further, in the zoom lens disclosed in Patent Document 2, since the aperture stop is formed between the lens groups that move during zooming, in order to obtain a desired F number, the aperture diameter is changed according to zooming. However, the lens configuration is not suitable for manual iris.

The present invention is, for example, a wide field angle, a high zoom ratio, and an object thereof is to provide a compact and lightweight, and high optical performance over the entire zoom range, and the manual aperture point in an advantageous zoom lens.

In order to achieve the above object, a zoom lens and an image pickup apparatus having the same according to the present invention include a negative lens on the most object side in order from the object side to the image side, and include two or more negative lenses and one or more positive lenses. A first lens group including a lens, which does not move for zooming and has a negative refractive power, and a second lens group which moves on the optical axis for zooming and has a positive refractive power. , A plurality of lens groups including two or more lens groups that move on the optical axis for zooming, a positive lens, a negative lens, and an aperture stop, do not move for zooming, and are positive. A final lens group having a refractive power, and the intervals between the adjacent lens groups change due to zooming, and the plurality of lens groups have a third lens group having a positive refractive power closest to the object side. A lens unit, the focal length of the first lens unit is f1, the focal length of the final lens unit is fn, and the difference between the position at the wide-angle end and the position at the telephoto end of the second lens unit. Is m2, and the difference of the lens group having the largest difference between the position at the wide-angle end and the position at the telephoto end among the plurality of lens groups is mn,
0<|f1/fn|<1.5
0.8<|m2/mn|<3.0
It is characterized by satisfying the following conditional expression.

According to the present invention, for example, a wide field angle, a high zoom ratio, size and weight, it is possible to provide a zoom range in over high optical performance, and the manual aperture point in an advantageous zoom lens.

Lens cross-sectional view of Numerical Example 1 when focused on infinity at the wide-angle end. Aberration diagrams at the time of wide-angle end (a), zoom middle (b), and telephoto end (c) of Numerical Example 1 when focused on infinity. Lens cross-sectional view of Numerical Example 2 when focused on infinity at the wide-angle end. Aberration diagrams of Numerical Example 2 when focused at infinity at the wide-angle end (a), the middle zoom (b), and the telephoto end (c). Lens cross-sectional view of Numerical Example 3 when focused on infinity at the wide-angle end. Aberration diagrams at the time of focusing at infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of Numerical Example 3. Lens cross-sectional view of Numerical Example 4 when focused on infinity at the wide-angle end. Aberration diagrams at the time of wide-angle end (a), zoom middle (b), and telephoto end (c) of Numerical Example 4 when focused on infinity. Numerical Example 5 lens cross-sectional view at the wide-angle end at infinity Aberration diagrams of Numerical Example 5 at the wide-angle end (a), the middle zoom (b), and the telephoto end (c) at the time of focusing at infinity. Numerical Example 6 A lens cross-sectional view at the wide-angle end when focused on infinity. Aberration diagrams of Numerical Example 6 when focused at infinity at the wide-angle end (a), the middle zoom (b), and the telephoto end (c). A lens cross-sectional view of Numerical Example 7 at the wide-angle end when focused on infinity. Aberration diagrams of Numerical Example 7 when focused at infinity at the wide-angle end (a), the middle zoom (b), and the telephoto end (c). Optical path diagrams at the wide-angle end (a), zoom middle (b), and telephoto end (c) of the zoom lens of Numerical Embodiment 1. Optical path diagrams at the wide-angle end (a), zoom middle (b), and telephoto end (c) of the zoom lens of Numerical Embodiment 1. Schematic diagram of the main part of the imaging device of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, the characteristics of the zoom lens of the present invention will be described along with each conditional expression. The zoom lens of the present invention has a wide angle of view, a high zoom ratio, a small size and a light weight, and high optical performance over the entire zoom range. It is characterized in that it defines the amount of movement when doubled.

A zoom lens and an image pickup apparatus having the same according to the present invention include, in order from an object side to an image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and two or more lens groups. It has a middle lens group including, and a final lens group having a positive refractive power. The first lens group does not move for zooming, and the second lens group moves for zooming. Of the middle lens groups, at least two or more lens groups move during zooming, and the final lens group does not move for zooming. The final lens group includes an aperture stop that does not move in the optical axis direction during zooming. A negative lens is disposed on the most object side of the first lens group, the first lens group has two or more negative lenses, one or more positive lenses, and the final lens group has one or more positive lenses. It has one or more negative lenses. The focal length of the first lens group is f1, the focal length of the last lens group is fn, the difference in position on the optical axis between the wide-angle end and the telephoto end of the second lens group is m2, and the wide-angle end and the telephoto end of the middle lens group are m2. Assuming that the difference between the positions of the lens group having the largest difference in the position on the optical axis at the end is mn,
0<|f1/fn|<1.5 (1)
0.8<|m2/mn|<3.0 (2)
Meets

In the present invention, an explanation will be given of the optical action by the configuration including the first lens group having a negative refractive power that does not move for zooming and the second lens group having a positive refractive power that moves during zooming. To do.

FIG. 15 shows optical path diagrams at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the first embodiment of the present invention. U1 to U5 represent the first lens group to the fifth lens group, respectively. As can be seen from FIG. 15, in the example of the present invention, the distance between the first lens group and the second lens group is a locus closer to the telephoto end than to the wide angle end. At the wide-angle end, the first lens group having negative refractive power and the second lens group having positive refractive power are arranged apart from each other, so that the entrance pupil position can be arranged on the object side. Therefore, the configuration is advantageous for achieving both wide angle and small size and light weight.

Further, in the present invention, the second lens group having a positive refracting power and the middle lens group including two or more lens groups constitute a variable power system. Upon zooming from the wide-angle end to the telephoto end, the second lens unit moves toward the object side and approaches the image point of the first lens unit for multiplication. Further, at the time of zooming from the wide-angle end to the telephoto end, at least two or more lens groups in the middle lens group move, thereby compensating for image plane movement due to zooming while suppressing aberration fluctuations due to zooming, and It is possible to effectively achieve both a variable power ratio and high optical performance.

Further, in the present invention, the final lens unit that does not move for zooming has an aperture stop located closest to the object side or within the final lens unit. This optical action will be described. FIG. 16 shows optical path diagrams at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) according to the first embodiment of the present invention. U1 to U5 represent the first lens group to the fifth lens group, respectively. In the embodiment of the present invention, since the final lens group does not move for zooming, the object point of the final lens (image point of the middle lens group) does not change regardless of zooming. Therefore, by arranging the aperture stop on the most object side of the final lens group or in the final lens group, it is possible to achieve a desired F number without changing the aperture diameter according to zooming.

Further, a negative lens is arranged on the most object side of the first lens group, the first lens group has two or more negative lenses, one or more positive lenses, and the final lens group has one or more positive lenses, It is characterized by having one or more negative lenses. The first lens group has a negative refracting power, but in order to widen the angle, a negative lens is arranged closest to the object side, and at least two lenses are used to suppress chromatic aberration generated in the first lens group. The above negative lens and one or more positive lenses are provided. Further, in the final lens group, an off-axis ray passes through a position away from the optical axis. Therefore, in order to satisfactorily correct lateral chromatic aberration particularly at the wide-angle end, one or more positive lenses and one or more negative lenses are required. Prepare

Further, by satisfying the above formulas (1) and (2), it is possible to effectively achieve high optical performance over the entire zoom range with a wide angle of view, small size and light weight. Expression (1) defines the ratio of the focal length of the first lens group and the focal length of the final lens group. By satisfying the expression (1), both widening of the zoom lens and correction of aberration variation are achieved. The focal length of the zoom lens is a value obtained by multiplying the focal length of the first lens unit by the lateral magnification from the second lens unit to the final lens unit. Therefore, in order to achieve a wide angle, the focal length of the first lens unit It is necessary to set the focal length appropriately. If the condition of the upper limit of the expression (1) is not satisfied, the refractive power of the first lens group becomes insufficient, and it is difficult to achieve both widening of the angle and reduction in size and weight. If the lower limit condition of the expression (1) is not satisfied, the refractive power of the first lens group becomes strong, and it becomes difficult to correct the aberration variation due to zooming and the aberration variation due to focusing. More preferably, the equation (1) should be set as follows.
0<|f1/fn|<1.0 (1a)

Further, the expression (2) defines the ratio of the amount of movement of the second lens unit and the amount of movement of the lens unit having the largest amount of movement in the middle lens unit during zooming from the wide-angle end to the telephoto end. By satisfying the expression (2), it is possible to achieve both small size and light weight and high optical performance. Here, focusing on the axial marginal ray in the optical path diagrams of FIGS. 15A, 15B, and 15C, the variation of the ray height from the wide-angle end to the telephoto end of the second lens group is large. Therefore, from the viewpoint of favorably correcting aberrations, it is desirable to reduce the amount of movement of the second lens group during zooming. On the other hand, as described above, in order to achieve both wide angle and small size and light weight, it is necessary to dispose the second lens group apart from the first lens group at the wide-angle end, and the second lens group at zooming. It is necessary to secure the amount of movement of the group. If the upper limit of Expression (2) is not satisfied, the amount of movement of the second lens group during zooming becomes large, and it becomes difficult to achieve good optical performance over the entire zoom range for the above reasons. If the lower limit condition of the expression (2) is not satisfied, the moving amount of the second lens group during zooming becomes small, and the first lens group and the second lens group are arranged close to each other at the wide-angle end. It becomes difficult to achieve both small size and light weight. More preferably, equation (2) should be set as follows.
1.0<|m2/mn|<2.5 (2a)

As a further aspect of the zoom lens of the present invention, the first lens group includes a lens group that moves during focusing. By using a configuration in which focusing is performed in a part of the first lens group, it is possible to make the amount of extension of focusing constant regardless of zooming, which is advantageous in simplifying the drive mechanism and downsizing the focus lens group. It becomes a composition.

As a further aspect of the zoom lens of the present invention, provisions regarding the configuration and focusing of the first lens group are provided. The first lens group includes an eleventh lens group having a negative refracting power that does not move for focusing, and a twelfth lens group having a positive or negative refracting power that moves during focusing, and the eleventh lens group When the focal length of is f11 and the focal length of the twelfth lens group is f12,
0<|f11/f12|<0.6 (3)
Meets Formula (3) is defined in order to suppress the amount of movement of the twelfth lens unit during focusing and achieve high optical performance. If the upper limit condition of the expression (3) is not satisfied, the refracting power of the eleventh lens unit becomes weak, and the moving amount of the twelfth lens unit at the time of focusing becomes large, which is disadvantageous in reducing the size and weight of the zoom lens. If the lower limit condition of the expression (3) is not satisfied, the refracting power of the eleventh lens group becomes strong, and it becomes difficult to correct aberration variation due to focusing. Further, if the number of lenses forming the eleventh lens group is increased to achieve good optical performance, it becomes difficult to reduce the size and weight of the zoom lens. More preferably, equation (3) should be set as follows.
0.02<|f11/f12|<0.5 (3a)

As a further aspect of the zoom lens of the present invention, provisions regarding the configuration and focusing of the first lens group are provided. The first lens group includes an eleventh lens group having a negative refractive power that does not move for focusing, a twelfth lens group having a positive or negative refractive power that moves during focusing, and a positive or negative refractive power. When the focal length of the eleventh lens group is f11,
1.0<f11/f1<3.0 (4)
Meets Formula (4) is defined in order to suppress the amount of movement of the twelfth lens unit during focusing and achieve high optical performance. If the upper limit condition of the equation (4) is not satisfied, the refracting power of the eleventh lens group becomes weak, and the moving amount of the twelfth lens group at the time of focusing becomes large, which is disadvantageous in reducing the size and weight of the zoom lens. If the condition of the lower limit of the equation (4) is not satisfied, the refracting power of the eleventh lens group becomes strong, and it becomes difficult to correct the aberration variation due to focusing. More preferably, the equation (4) should be set as follows.
1.2<f11/f1<2.5 (4a)

As a further aspect of the zoom lens of the present invention, the third lens group which is the most object side lens group of the middle lens group is a lens group having a positive refractive power, and the focal length of the second lens group is f2, When the focal length of the three lens groups is f3,
−1.0<f1×(f2+f3)/(f2×f3)<−0.3 (5)
Meets Expression (5) defines the ratio of the focal lengths of the first lens group and the focal lengths of the second lens group and the third lens group. (F2+f3)/(f2×f3) in the equation (5) is a numerical value corresponding to the combined focal length of the second lens group and the third lens group. By satisfying the expression (5), both widening of the zoom lens and correction of aberration variation are achieved. The focal length of the zoom lens is a value obtained by multiplying the focal length of the first lens group by the lateral magnification from the middle lens group to the final lens group. Therefore, in order to achieve a wide angle, the focal length of the first lens group The distance needs to be set appropriately. If the upper limit condition of the equation (5) is not satisfied, the refractive power of the first lens group becomes strong, and it becomes difficult to correct the aberration variation due to zooming and the aberration variation due to focusing. If the lower limit condition of the expression (5) is not satisfied, the refractive power of the first lens group will be insufficient, and it will be difficult to achieve both widening of the angle and reduction in size and weight. Further, since the combined focal length of the second lens group and the third lens group becomes short, it becomes difficult to correct the aberration variation due to zooming. More preferably, the equation (5) should be set as follows.
−0.9<f1×(f2+f3)/(f2×f3)<−0.4 (5a)

As a further aspect of the zoom lens of the present invention, the third lens group which is the most object side lens group of the middle lens group is a lens group having a negative refractive power, and the focal length of the second lens group is f2. When
-1.0<f1/f2<-0.3 (6)
Meets Expression (6) defines the ratio of the focal length of the first lens group and the focal length of the second lens group. By satisfying the expression (6), both widening of the zoom lens and correction of aberration variation are achieved. The focal length of the zoom lens is a value obtained by multiplying the focal length of the first lens group by the lateral magnification from the middle lens group to the final lens group. Therefore, in order to achieve a wide angle, the focal length of the first lens group The distance needs to be set appropriately. If the upper limit condition of the expression (6) is not satisfied, the refractive power of the first lens group becomes strong, and it becomes difficult to correct the aberration variation due to zooming and the aberration variation due to focusing. If the lower limit condition of Expression (6) is not satisfied, the refractive power of the first lens group becomes insufficient, and it is difficult to achieve both wide angle and small size and weight. In addition, since the focal length of the second lens group becomes short, it becomes difficult to correct aberration fluctuations due to zooming. More preferably, equation (6) should be set as follows.
-0.9<f1/f2<-0.35 (6a)

As a further aspect of the zoom lens of the present invention, the middle lens group includes a third lens group having a positive refractive power and a fourth lens group having a negative refractive power, and the middle lens group includes a second lens group and a third lens group. It defines the lateral magnification and the ratio of the focal length between the wide-angle end and the telephoto end. The lateral magnifications of the second lens group at the wide-angle end and the telephoto end when the light beam enters from infinity are β2w and β2t, and the lateral magnifications of the third lens group are β3w and β3t, respectively, and the focal lengths at the wide-angle end and the telephoto end are Let fw and ft respectively,
0.5<(fw×β2t×β3t)/(ft×β2w×β3w)<1.0
...(7)
Meets By satisfying the expression (7), the second lens group and the third lens group contribute a certain amount or more to zooming, which is advantageous for achieving both wide angle and high optical properties. If the upper limit of Expression (7) is not satisfied, the amount of movement of the second lens group and the third lens group due to zooming becomes large, and the ray height of the axial marginal ray passing through the second lens group and the third lens group becomes It changes greatly with zooming from the wide-angle end to the telephoto end. Therefore, it becomes difficult to suppress variations in spherical aberration and curvature of field due to zooming. If the lower limit of Expression (7) is not satisfied, the distance between the first lens group, the second lens group, and the third lens group becomes short at the wide-angle end, and the lateral magnification of the second lens group and the third lens group is reduced. Therefore, it becomes difficult to widen the angle. More preferably, equation (7) should be set as follows.
0.60<(fw×β2t×β3t)/(ft×β2w×β3w)<0.85
...(7a)

When the focal lengths of the first lens group and the fourth lens group are f1 and f4,
0.4<f1/f4<1.2 (8)
Meets By satisfying the expression (8), both compactness and light weight and high optical performance are achieved. If the upper limit of Expression (8) is not satisfied, the refractive power of the fourth lens group becomes relatively strong, and it becomes difficult to suppress variations in spherical aberration and coma aberration due to zooming. If the lower limit of Expression (8) is not satisfied, the refractive power of the fourth lens group becomes relatively weak, and the amount of movement of the fourth lens group during zooming increases, which makes it difficult to reduce the size and weight. More preferably, equation (8) should be set as follows.
0.45<f1/f4<1.15 (8a)

Further, the image pickup apparatus of the present invention is characterized by having the zoom lens of each embodiment and a solid-state image pickup element having a predetermined effective image pickup range for receiving an image formed by the zoom lens.

Hereinafter, a specific configuration of the zoom lens of the present invention will be described based on the features of the lens configurations of Numerical Examples 1 to 7 corresponding to Examples 1 to 7.

FIG. 1 is a lens cross-sectional view of a zoom lens that is Embodiment 1 (Numerical Embodiment 1) of the present invention when focusing on infinity at the wide-angle end. In FIG. 2, (a) is a wide-angle end of Numerical Example 1, (b) is a focal length of Numerical Example 1 of 22.14 mm, and (c) is a longitudinal aberration diagram of Numerical Example 1 at the telephoto end. .. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity. The value of the focal length is a value when a numerical example described later is expressed in mm. This also applies to the following numerical examples.

In FIG. 1, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side to the image side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a positive refractive power moving to the object side. have. Further, the fourth lens group having a negative refractive power, which moves non-linearly on the optical axis in conjunction with the movement of the second lens group U2 and the third lens group U3, and corrects the image plane variation due to zooming. It has U4. Further, it has a fifth lens unit U5 having a positive refracting power which does not move for zooming and has an image forming action. SP is an aperture stop, which is arranged closest to the object side in the fifth lens unit U5. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third lens group and the fourth lens group, and the final lens group corresponds to the fifth lens group. I is an image plane, and when it is used as an image pickup optical system of a television camera for broadcasting, a video camera, a digital still camera, a solid-state image pickup element (photoelectric conversion element) that receives an image formed by a zoom lens and photoelectrically converts it ) And the like. When used as an image pickup optical system of a film camera, the image formed by the zoom lens corresponds to the film surface to which the image is exposed.

In the longitudinal aberration diagram, the straight line and the chain double-dashed line in the spherical aberration are the e line and the g line, respectively. The dotted line and the solid line in the astigmatism are the meridional image plane and the sagittal image plane, respectively, and the two-dot chain line in the lateral chromatic aberration is the g line. ω is a half angle of view, and Fno is an F number. In the longitudinal aberration diagram, the spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 10%, and the chromatic aberration of magnification 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 second lens unit U2 for zooming is located at both ends of the movable range on the optical axis with respect to the mechanism.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first to twelfth surfaces. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move during focusing, and a twelfth lens unit U11 having a positive refractive power that moves toward the image side when focusing from the infinity side to the close side. It consists of U12. The second lens group U2 corresponds to the 13th to 17th surfaces, the third lens group U3 corresponds to the 18th to 19th surfaces, and the fourth lens group U4 corresponds to the 20th to 24th surfaces. There is. The fifth lens unit U5 corresponds to the 25th surface to the 36th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of six lenses as a whole. The second lens group U2 has three lenses as a whole including a convex lens and a concave lens, the third lens group U3 has one convex lens, and the fourth lens group U4 has a total of three lenses including a convex lens and a concave lens. Made of The fifth lens unit U5 includes a total of seven lenses including a convex lens and a concave lens.

Numerical Example 1 corresponding to Example 1 will be described. Not only in Numerical Example 1 but also in all Numerical Examples, i indicates the order of the surface (optical surface) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di is the i-th surface from the object side. The distance (on the optical axis) between the i-th surface and the i+1-th surface is shown. Further, ndi, νdi, and θgFi represent the refractive index, Abbe number, and partial dispersion ratio of the medium (optical member) between the i-th surface and the (i+1)-th surface, and BF represents an air-equivalent back focus. ing. The aspherical shape has an X-axis in the optical axis direction, an H-axis in the direction perpendicular to the optical axis, a positive traveling direction of light, R is a paraxial radius of curvature, k is a conical constant, and A4, A6, A8, A10, and A12 are When each is an aspherical coefficient, it is expressed by the following equation. Moreover, "e-Z" means " ^x10 -Z."

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. This embodiment satisfies the expressions (1) to (3), (5), (7), and (8), and the photographing field angle (field angle) at the wide-angle end is 96.0° and the zoom ratio is 2. Achieving both wide angle and high magnification at the same time. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Also, by arranging the aperture stop on the most object side of the fifth lens unit U5, the desired F number can be achieved without changing the aperture diameter according to zooming, and a zoom lens optimal for a manual aperture is realized. is doing. However, the zoom lens of the present invention is required to satisfy the expressions (1) and (2), but the expressions (3) to (8) may not be satisfied. However, if at least one of the expressions (3) to (8) is satisfied, a better effect can be obtained. This also applies to the other embodiments.

FIG. 17 is a schematic diagram of an image pickup apparatus (television camera system) using the zoom lens of each example as a photographing optical system. In FIG. 18, reference numeral 101 denotes the zoom lens according to any one of Examples 1 to 8. Reference numeral 124 is a camera. The zoom lens 101 is attachable to and detachable from the camera 124. Reference numeral 125 denotes an image pickup apparatus configured by mounting the zoom lens 101 on the camera 124. The zoom lens 101 has a first lens group F, a variable power portion LZ, and a fourth lens group R for image formation. The first lens group F includes a focusing lens group. The variable power unit LZ includes a second lens group that moves on the optical axis for zooming, and a third lens group that moves on the optical axis to correct the image plane variation due to zooming. SP is an aperture stop. Reference numerals 114 and 115 denote driving mechanisms such as a helicoid and a cam for driving the first lens group F and the variable power portion LZ in the optical axis direction. Reference numerals 116 to 118 denote motors (driving means) that electrically drive the driving mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 are encoders, potentiometers, photosensors, or other detectors for detecting the positions of the first lens group F and the variable power portion LZ on the optical axis, and the aperture diameter of the aperture stop SP. In the camera 124, 109 is a glass block corresponding to an optical filter or color separation optical system in the camera 124, 110 is a solid-state image sensor (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. Element). Reference numerals 111 and 122 denote CPUs that control various drives of the camera 124 and the zoom lens 101.

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

FIG. 3 is a lens cross-sectional view of a zoom lens that is Embodiment 2 (Numerical Embodiment 2) of the present invention when focusing on infinity at the wide-angle end. 4, (a) is a longitudinal aberration diagram at the wide-angle end of Numerical Example 2, (b) is a focal length of 14.07 mm in Numerical Example 2, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 2. .. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity.

In FIG. 3, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a positive refractive power moving to the object side. have. Further, the fourth lens group having a negative refractive power, which moves non-linearly on the optical axis in conjunction with the movement of the second lens group U2 and the third lens group U3, and corrects the image plane variation due to zooming. It has U4. Further, it has a fifth lens unit U5 having a positive refracting power which does not move for zooming and has an image forming action. SP is an aperture stop, which is arranged closest to the object side in the fifth lens unit U5. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third lens group and the fourth lens group, and the final lens group corresponds to the fifth lens group.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first to thirteenth surfaces. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move during focusing, and a twelfth lens unit U11 having a positive refractive power that moves toward the image side when focusing from the infinity side to the close side. It consists of U12. The second lens group U2 corresponds to the 14th to 18th surfaces, the third lens group U3 corresponds to the 19th to 20th surfaces, and the fourth lens group U4 corresponds to the 21st to 25th surfaces. There is. The fifth lens unit U5 corresponds to the 26th surface to the 39th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of seven lenses as a whole. The second lens group U2 has three lenses as a whole including a convex lens and a concave lens, the third lens group U3 has one convex lens, and the fourth lens group U4 has a total of three lenses including a convex lens and a concave lens. Made of The fifth lens unit U5 includes a total of eight lenses including a convex lens and a concave lens.

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. In this embodiment, (1) to (3), (5), (7), and (8) shooting angle of view (angle of view) at the wide-angle end is 120.0°, zoom ratio is 2.44, and wide angle and high magnification are achieved. Has achieved both. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Also, by arranging the aperture stop on the most object side of the fifth lens unit U5, the desired F number can be achieved without changing the aperture diameter according to zooming, and a zoom lens optimal for a manual aperture is realized. is doing.

FIG. 5 is a lens cross-sectional view of a zoom lens that is Embodiment 3 (Numerical Embodiment 3) of the present invention when focusing on infinity at the wide-angle end. 6, (a) is a longitudinal aberration diagram at the wide-angle end of Numerical Example 3, (b) is a focal length of 19.17 mm of Numerical Example 3, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 3. .. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity.

In FIG. 7, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a positive refractive power moving to the object side. have. Further, the fourth lens group having a negative refractive power, which moves non-linearly on the optical axis in conjunction with the movement of the second lens group U2 and the third lens group U3, and corrects the image plane variation due to zooming. It has U4. Further, it has a fifth lens unit U5 having a positive refracting power which does not move for zooming and has an image forming action. SP is an aperture stop, which is arranged closest to the object side in the fifth lens unit U5. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third lens group and the fourth lens group, and the final lens group corresponds to the fifth lens group.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first surface to the eleventh surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move during focusing, and a twelfth lens unit U11 having a positive refractive power that moves toward the image side when focusing from the infinity side to the close side. It consists of U12. The second lens group U2 corresponds to the 12th to 16th surfaces, the third lens group U3 corresponds to the 17th to 18th surfaces, and the fourth lens group U4 corresponds to the 19th to 23rd surfaces. There is. The fifth lens unit U5 corresponds to the 24th surface to the 35th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of six lenses as a whole. The second lens group U2 has three lenses as a whole including a convex lens and a concave lens, the third lens group U3 has one convex lens, and the fourth lens group U4 has a total of three lenses including a convex lens and a concave lens. Made of The fifth lens unit U5 includes a total of seven lenses including a convex lens and a concave lens.

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. This embodiment satisfies the expressions (1) to (3), (5), (7), and (8), and the photographing field angle (field angle) at the wide-angle end is 111.9° and the zoom ratio is 3. 33, wide angle and high magnification have been achieved. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Also, by arranging the aperture stop on the most object side of the fifth lens unit U5, the desired F number can be achieved without changing the aperture diameter according to zooming, and a zoom lens optimal for a manual aperture is realized. is doing.

FIG. 7 is a lens cross-sectional view of a zoom lens that is Embodiment 4 (Numerical Embodiment 4) of the present invention when focusing on infinity at the wide-angle end. 8, (a) is a longitudinal aberration diagram at the wide-angle end of Numerical Example 4, (b) is a focal length of 18.97 mm at Numerical Example 4, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 4. .. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity.

In FIG. 7, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a positive refractive power moving to the object side. have. Further, the fourth lens group having a negative refractive power, which moves non-linearly on the optical axis in conjunction with the movement of the second lens group U2 and the third lens group U3, and corrects the image plane variation due to zooming. It has U4. Further, it has a fifth lens unit U5 having a positive refracting power which does not move for zooming and has an image forming action. SP is an aperture stop, which is arranged closest to the object side in the fifth lens unit U5. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third lens group and the fourth lens group, and the final lens group corresponds to the fifth lens group.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first to fourteenth surfaces. The first lens unit U1 includes an eleventh lens unit U11 having a negative refracting power that does not move during focusing and a twelfth lens unit U11 having a negative refracting power that moves toward the object side when focusing from an infinity side to a close side. U12 is composed of a thirteenth lens unit U13 having a positive refractive power which does not move during focusing. The second lens group U2 corresponds to the 15th to 17th surfaces, the third lens group U3 corresponds to the 18th to 22nd surfaces, and the fourth lens group U4 corresponds to the 23rd to 26th surfaces. There is. The fifth lens unit U5 corresponds to the 27th surface to the 38th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of seven lenses as a whole. The second lens group U2 includes two lenses as a whole including a convex lens and a concave lens, the third lens group U3 includes three lenses as a whole including a convex lens and a concave lens, and the fourth lens group U4 includes a convex lens and a concave lens. It consists of three lenses as a whole. The fifth lens unit U5 includes a total of seven lenses including a convex lens and a concave lens.

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. The present embodiment satisfies the expressions (1), (2), (4), (5), (7), and (8), and the shooting angle of view (angle of view) at the wide-angle end is 101.9°. Achieving both wide angle and high magnification with a magnification ratio of 2.50. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Also, by arranging the aperture stop on the most object side of the fifth lens unit U5, the desired F number can be achieved without changing the aperture diameter according to zooming, and a zoom lens optimal for a manual aperture is realized. is doing.

FIG. 9 is a lens cross-sectional view of a zoom lens that is Embodiment 5 (Numerical Embodiment 5) of the present invention when focusing on infinity at the wide-angle end. In FIG. 9, (a) is a longitudinal aberration diagram at the wide-angle end of Numerical Example 5, (b) is a focal length of 40 mm of Numerical Example 5, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 5. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity.

In FIG. 9, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a positive refractive power moving to the object side. have. Further, the fourth lens group having a negative refractive power, which moves non-linearly on the optical axis in conjunction with the movement of the second lens group U2 and the third lens group U3, and corrects the image plane variation due to zooming. It has U4. Further, it has a fifth lens unit U5 having a positive refracting power which does not move for zooming and has an image forming action. SP is an aperture stop, which is arranged closest to the object side in the fifth lens unit U5. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third lens group and the fourth lens group, and the final lens group corresponds to the fifth lens group.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first surface to the tenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move during focusing, and a twelfth lens unit U11 having a positive refractive power that moves toward the image side when focusing from the infinity side to the close side. It consists of U12. The second lens unit U2 corresponds to the eleventh surface to the thirteenth surface, the third lens group U3 corresponds to the fourteenth surface to the fifteenth surface, and the fourth lens group U4 corresponds to the sixteenth surface to the eighteenth surface. There is. The fifth lens unit U5 corresponds to the 19th surface to the 27th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of five lenses as a whole. The second lens group U2 includes two lenses as a whole including a convex lens and a concave lens, the third lens group U3 has one convex lens, and the fourth lens group U4 has a total of two lenses including a convex lens and a concave lens. Made of The fifth lens unit U5 includes five lenses as a whole, including a convex lens and a concave lens.

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. This embodiment satisfies the expressions (1) to (3), (5), (7), and (8), and the photographing field angle (field angle) at the wide-angle end is 81.6° and the zoom ratio is 4. 44, wide angle and high magnification are achieved at the same time. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Also, by arranging the aperture stop on the most object side of the fifth lens unit U5, the desired F number can be achieved without changing the aperture diameter according to zooming, and a zoom lens optimal for a manual aperture is realized. is doing.

FIG. 11 is a lens cross-sectional view of a zoom lens that is Embodiment 6 (Numerical Embodiment 6) of the present invention when focusing on infinity at the wide-angle end. In FIG. 11, (a) is a longitudinal aberration diagram at the wide-angle end of Numerical Example 6, (b) is a focal length of 40 mm of Numerical Example 6, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 6. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity.

In FIG. 11, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a positive refractive power moving to the object side. have. Further, the fourth lens unit U4, the second lens unit U2, and the third lens unit U3, which have a negative refracting power and do not move for zooming, move non-linearly along the optical axis in conjunction with the movement. It has a fifth lens unit U5 having a positive refractive power that corrects the image plane variation due to zooming. Further, it has a sixth lens unit U6 having a negative refracting power which has an image forming action and does not move for zooming. SP is an aperture stop, which is arranged closest to the object side in the sixth lens unit U6. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third to fifth lens groups, and the final lens group corresponds to the sixth lens group.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first surface to the eighth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refracting power that does not move during focusing and a twelfth lens unit U11 having a negative refracting power that moves toward the object side when focusing from an infinity side to a close side. It consists of U12. The second lens group U2 corresponds to the ninth surface to the eleventh surface, the third lens group U3 corresponds to the twelfth surface to the fifteenth surface, and the fourth lens group U4 corresponds to the sixteenth surface to the eighteenth surface. There is. The fifth lens group U5 corresponds to the 19th to 21st surfaces, and the sixth lens group U6 corresponds to the 22nd to 30th surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of four lenses as a whole. Each of the second lens unit U2 to the fifth lens unit U5 is composed of two lenses as a whole including a convex lens and a concave lens. The sixth lens unit U6 is composed of five lenses as a whole including a convex lens and a concave lens.

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. This embodiment satisfies the expressions (1) to (3) and (5), and has a wide field angle and a high magnification ratio with a shooting field angle (field angle) of 81.6° at the wide angle end and a zoom ratio of 4.17. Achieving a balance. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Also, by arranging the aperture stop on the most object side of the sixth lens unit U6, the desired F number can be achieved without changing the aperture diameter according to zooming, and a zoom lens optimal for a manual aperture is realized. is doing.

FIG. 13 is a lens cross-sectional view of a zoom lens that is Embodiment 7 (Numerical Embodiment 7) of the present invention when focusing on infinity at the wide-angle end. 13, (a) is a longitudinal aberration diagram at the wide-angle end of Numerical Example 7, (b) is a focal length of 19 mm at Numerical Example 7, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 7. Each aberration diagram is a longitudinal aberration diagram when focusing on infinity.

In FIG. 13, a first lens unit U1 having a negative refractive power for focusing is provided in order from the object side. Further, during zooming from the wide-angle end to the telephoto end, the second lens unit U2 having a positive refractive power for zooming moves to the object side, and the third lens unit U3 having a negative refractive power moving to the image side. have. Further, the fourth lens group having a positive refractive power, which moves non-linearly along the optical axis in conjunction with the movement of the second lens group U2 and the third lens group U3, and corrects the image plane variation due to zooming. It has U4. Further, it has a fifth lens unit U5 having a positive refracting power which does not move for zooming and has an image forming action. SP is an aperture stop and is arranged in the fifth lens unit U5. Further, the aperture stop does not move in the optical axis direction during zooming. The middle lens group corresponds to the third lens group, the fourth lens group, and the final lens group corresponds to the fifth lens group.

Next, the first lens unit U1 in this embodiment will be described. The first lens unit U1 corresponds to the first to fourteenth surfaces. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move during focusing, and a twelfth lens unit U11 having a positive refractive power that moves toward the image side when focusing from the infinity side to the close side. It consists of U12. The second lens group U2 corresponds to the 15th to 22nd surfaces, the third lens group U3 corresponds to the 23rd to 26th surfaces, and the fourth lens group U4 corresponds to the 27th to 28th surfaces. There is. The fifth lens unit U5 corresponds to the 29th surface to the 40th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of seven lenses as a whole. The second lens group U2 includes five lenses as a whole including a convex lens and a concave lens, the third lens group U3 includes three lenses as a whole including a convex lens and a concave lens, and the fourth lens group U4 includes one convex lens. Made of The fifth lens unit U5 includes a total of six lenses including a convex lens and a concave lens.

Table 1 shows the values corresponding to the respective conditional expressions of this embodiment. This embodiment satisfies the expressions (1) to (3) and (6), and has a wide field angle and a high magnification ratio with a shooting field angle (field angle) of 104.6° at the wide angle end and a zoom ratio of 2.5. Achieving a balance. In addition, we have achieved a zoom lens that has both high optical performance with good correction of various aberrations over the entire zoom range and compact size and light weight. Further, by disposing the aperture stop in the fifth lens unit U5, a desired F number can be achieved without changing the aperture diameter according to the magnification change, and a zoom lens optimal for a manual aperture can be realized. There is.

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

<Numerical Example 1>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 75.164 2.70 1.60311 60.6 67.00
2 25.320 18.97 48.40
3 155.656 1.70 1.59522 67.7 44.88
4 29.128 15.49 38.77
5 -40.283 1.50 1.59522 67.7 37.62
6 -694.681 0.19 38.75
7 78.524 2.66 1.72047 34.7 39.58
8 105.930 1.98 39.45
9 78.871 8.66 1.49700 81.5 39.90
10 -50.530 0.19 39.77
11 138.615 1.71 1.77250 49.6 36.60
12 51.765 (variable) 35.04
13 84.809 1.20 1.85478 24.8 34.44
14 41.631 7.31 1.49700 81.5 34.31
15 -158.198 0.99 34.96
16 79.691 5.30 1.76385 48.5 36.93
17 -277.499 (variable) 37.05
18 151.627 5.86 1.59522 67.7 36.67
19 -75.658 (variable) 36.41
20 -56.731 0.90 1.69680 55.5 22.50
21 35.513 3.49 1.85478 24.8 22.11
22 233.045 1.11 21.81
23 -88.493 0.90 1.77250 49.6 21.77
24 84.780 (variable) 21.76
25 (Aperture) ∞ 1.49 22.07
26 43.376 4.13 1.77250 49.6 22.66
27 -102.761 10.00 22.41
28 -80.458 3.58 1.80809 22.8 18.30
29 -27.520 1.50 1.90366 31.3 18.62
30 -94.036 0.98 19.19
31 175.254 1.00 1.88300 40.8 19.59
32 18.443 5.82 1.49700 81.5 19.84
33 -96.013 1.00 20.92
34 51.136 7.51 1.49 700 81.5 22.58
35 -17.878 1.28 1.85478 24.8 23.02
36* -33.419 42.06 24.45
Image plane ∞

Aspherical data First surface
K = 0.00000e+000 A 4= 3.13169e-006 A 6= 3.62423e-010 A 8=-4.13256e-013 A10= 4.11411e-016 A12= 8.36082e-020

Surface 36
K = 0.00000e+000 A 4=-5.75442e-006 A 6=-1.11660e-008 A 8=-1.76183e-011 A10= 2.21500e-014 A12=-3.07840e-016

Various data Zoom ratio 2.50
Wide-angle mid-telephoto focal length 14.00 22.14 35.00
F number 2.80 2.80 2.80
Half angle of view 48.00 35.09 23.96
Image height 15.55 15.55 15.55
Total lens length 219.00 219.00 219.00
BF 42.06 42.06 42.06

d12 31.88 16.40 4.19
d17 1.99 15.04 21.80
d19 1.99 11.81 27.64
d24 19.98 12.59 2.20

Entrance pupil position 32.49 35.23 39.36
Exit pupil position -40.00 -40.00 -40.00
Front principal point position 44.10 51.39 59.43
Rear principal point position 28.06 19.92 7.06

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -22.42 55.76 13.19 -31.45
2 13 60.10 14.80 6.04 -3.63
3 18 85.32 5.86 2.47 -1.23
4 20 -33.20 6.40 2.46 -1.46
5 25 43.74 38.30 11.72 -23.99

<Numerical value example 2>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 287.303 2.70 1.76385 48.5 81.72
2 31.984 15.50 58.78
3* 60.519 1.80 1.76385 48.5 55.14
4 23.611 10.70 41.51
5 89.099 1.25 1.59522 67.7 41.09
6 49.248 7.36 39.51
7 -81.670 1.25 1.53775 74.7 39.23
8 37.263 4.51 1.85478 24.8 38.99
9 67.024 1.43 38.61
10 66.566 9.62 1.49700 81.5 38.80
11 -45.278 0.15 38.52
12 326.882 1.40 2.00100 29.1 34.85
13 61.213 (Variable) 33.51
14 56.327 1.00 1.85478 24.8 34.66
15 33.093 8.03 1.49700 81.5 34.38
16 -218.823 0.15 34.85
17* 93.307 5.11 1.77250 49.6 35.31
18 -128.805 (variable) 35.30
19 11610.358 5.75 1.59349 67.0 31.59
20 -39.722 (variable) 31.66
21 -56.461 0.80 1.88300 40.8 18.74
22 17.384 4.83 1.85478 24.8 18.32
23 -109.985 0.86 18.17
24 -33.672 0.80 1.88300 40.8 18.17
25 1473.319 (Variable) 18.40
26 (Aperture) ∞ 1.43 18.72
27 42.364 3.56 1.77250 49.6 19.27
28 -93.033 5.45 19.10
29 84.696 0.80 2.00100 29.1 17.08
30 20.229 4.00 1.80518 25.4 16.53
31 -118.228 2.19 16.15
32 484.011 0.80 1.88300 40.8 14.95
33 14.438 3.51 1.49700 81.5 14.33
34 44.105 1.11 15.51
35 27.191 7.02 1.43875 94.9 17.53
36 -13.864 0.80 2.00069 25.5 18.40
37 -42.929 0.15 20.69
38 -125.920 4.83 1.77250 49.6 21.68
39 -20.810 39.88 22.87
Image plane ∞

Aspherical data First surface
K = 1.26950e+001 A 4= 7.98800e-006 A 6=-6.57602e-009 A 8= 5.04249e-012 A10=-2.30700e-015 A12= 5.06732e-019

Third side
K = 3.94166e-001 A 4=-5.96572e-006 A 6= 5.42546e-009 A 8= 5.61957e-012 A10=-1.53212e-014 A12= 8.06629e-018

Surface 17
K =-4.12377e+000 A 4=-1.10688e-006 A 6=-8.00313e-010 A 8=-3.10207e-012

Various data Zoom ratio 2.44
Wide-angle mid-telephoto focal length 9.00 14.07 22.00
F number 2.80 2.80 2.80
Half angle of view 59.94 47.86 35.26
Image height 15.55 15.55 15.55
Total lens length 206.30 206.30 206.30
BF 39.88 39.88 39.88

d13 27.48 13.77 4.26
d18 2.55 12.06 17.42
d20 1.61 10.15 22.76
d25 14.16 9.81 1.35

Entrance pupil position 25.01 26.37 28.25
Exit pupil position -49.98 -49.98 -49.98
Front principal point position 33.11 38.24 44.86
Rear principal point position 30.88 25.81 17.88

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -13.76 57.67 12.64 -28.07
2 14 49.45 14.30 5.49 -3.71
3 19 66.48 5.75 3.59 -0.01
4 21 -26.65 7.28 2.16 -1.99
5 26 38.69 35.63 16.92 -19.90

<Numerical value example 3>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 635.351 2.70 1.76385 48.5 81.48
2 37.645 13.38 62.17
3* 65.786 1.80 1.76385 48.5 58.06
4 26.359 17.20 44.87
5 -67.137 1.25 1.53775 74.7 44.57
6 39.279 6.03 1.80000 29.8 44.95
7 88.105 1.32 44.62
8 75.909 10.48 1.49 700 81.5 44.82
9 -55.299 0.15 44.49
10 267.530 1.40 1.95375 32.3 40.37
11 66.549 (variable) 38.83
12 111.730 1.00 1.85478 24.8 38.00
13 46.553 8.03 1.49700 81.5 37.83
14 -116.060 0.15 38.20
15* 82.727 5.84 1.76385 48.5 38.45
16 -147.152 (variable) 38.08
17 -237.826 4.49 1.59349 67.0 31.30
18 -48.626 (variable) 31.28
19 -68.749 0.80 1.88300 40.8 20.53
20 20.988 4.87 1.85478 24.8 20.18
21 -118.798 0.89 20.04
22 -39.129 0.80 1.88300 40.8 20.04
23 464.892 (variable) 20.27
24 (aperture) ∞ 1.41 22.56
25 38.435 4.21 1.77250 49.6 23.32
26 -155.783 11.68 23.03
27 77.374 3.83 1.75520 27.5 18.14
28 -31.781 0.80 2.00100 29.1 17.48
29 26.506 1.21 17.69
30 24.512 0.80 1.88300 40.8 19.67
31 18.690 6.11 1.49 700 81.5 19.75
32 -53.118 5.70 20.70
33 38.724 6.48 1.43875 94.9 24.47
34 -31.488 0.80 2.00100 29.1 24.63
35 -53.868 38.87 25.16
Image plane ∞

Aspherical data First surface
K =-5.93998e+002 A 4= 7.72789e-006 A 6=-6.14283e-009 A 8= 4.43506e-012 A10=-1.93389e-015 A12= 4.10784e-019

Third side
K =-3.49710e-001 A 4=-4.95136e-006 A 6= 1.73291e-009 A 8= 7.27859e-012 A10=-1.18345e-014 A12= 5.14306e-018

Surface 15
K =-8.12671e-001 A 4=-3.54186e-007 A 6=-2.69286e-010 A 8=-5.05059e-013

Various data Zoom ratio 3.33
Wide-angle mid-telephoto focal length 10.50 19.17 34.99
F number 2.80 2.80 3.69
Half angle of view 55.97 39.05 23.96
Image height 15.55 15.55 15.55
Total lens length 228.87 228.87 228.87
BF 38.87 38.87 38.87

d11 39.11 18.72 6.03
d16 1.72 16.15 21.32
d18 1.65 14.40 35.63
d23 21.94 15.14 1.43

Entrance pupil position 27.31 30.21 34.88
Exit pupil position -49.98 -49.98 -49.98
Front principal point position 36.57 45.25 56.10
Rear principal point position 28.37 19.70 3.88

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -18.78 55.71 10.86 -29.93
2 12 54.33 15.01 6.79 -2.65
3 17 101.72 4.49 3.50 0.72
4 19 -30.89 7.36 2.33 -1.89
5 24 43.11 43.02 13.41 -30.51

<Numerical Example 4>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 292.496 3.00 1.60311 60.6 79.68
2 27.771 16.00 52.90
3 58.575 2.40 1.59522 67.7 50.18
4 30.555 8.61 43.73
5 67.617 2.40 1.59522 67.7 42.02
6 37.202 13.52 39.10
7 -36.490 1.50 1.59522 67.7 38.31
8 -265.008 0.19 39.98
9 103.383 3.22 1.72047 34.7 41.00
10 259.506 1.94 41.04
11 121.921 8.51 1.51742 52.4 41.49
12 -47.659 0.17 41.45
13 283.046 1.71 1.77250 49.6 38.15
14 60.253 (variable) 36.63
15 79.660 1.20 1.83400 37.2 35.71
16 41.204 8.09 1.59522 67.7 35.58
17 -107.224 (variable) 35.84
18 91.474 6.21 1.49700 81.5 38.30
19 -88.777 1.70 1.85478 24.8 38.35
20 -217.982 0.20 38.67
21 73.547 6.94 1.48749 70.2 38.84
22 -102.895 (variable) 38.47
23 -54.336 1.00 1.88300 40.8 22.20
24 40.367 4.79 1.85478 24.8 22.14
25 -48.877 1.00 1.88300 40.8 22.12
26 96.959 (variable) 22.11
27 (Aperture) ∞ 3.02 22.43
28 49.195 4.50 1.77250 49.6 23.32
29 -114.490 10.01 23.06
30 -273.857 1.50 1.90366 31.3 19.47
31 40.627 3.43 1.80809 22.8 19.07
32 -169.549 0.19 19.27
33 145.224 1.00 1.88300 40.8 19.44
34 19.093 5.56 1.49700 81.5 19.62
35 -95.418 1.00 20.55
36 61.714 7.44 1.49 700 81.5 21.84
37 -17.916 1.28 1.85478 24.8 22.36
38* -34.369 45.32 23.69
Image plane ∞

Aspherical data First surface
K = 4.34647e+001 A 4= 4.29705e-006 A 6=-1.95019e-009 A 8= 5.42308e-013 A10= 1.09740e-016 A12=-7.43557e-020

Surface 38
K = 0.00000e+000 A 4=-6.09047e-006 A 6=-1.78926e-008 A 8= 9.11734e-011 A10=-6.90669e-013 A12= 1.51742e-015

Various data Zoom ratio 2.50
Wide-angle mid-telephoto focal length 12.00 18.97 30.00
F number 2.80 2.80 2.80
Half angle of view 50.96 37.96 26.26
Image height 14.80 14.80 14.80
Total lens length 232.70 232.70 232.70
BF 45.32 45.32 45.32

d14 30.22 12.43 2.03
d17 1.97 8.53 11.95
d22 1.89 18.58 38.09
d26 20.08 14.61 2.09

Entrance pupil position 29.65 31.99 35.01
Exit pupil position -39.99 -39.99 -39.99
Front principal point position 39.96 46.74 54.46
Rear principal point position 33.32 26.34 15.32

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -18.88 63.17 12.89 -35.37
2 15 98.98 9.29 2.79 -3.04
3 18 61.88 15.05 5.23 -4.94
4 23 -36.71 6.79 1.29 -2.26
5 27 44.57 38.92 12.73 -22.16

<Numerical Example 5>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 152.831 2.70 1.77250 49.6 65.19
2 30.643 17.40 50.62
3 -106.326 1.60 1.59522 67.7 50.05
4 52.832 0.20 48.64
5 49.415 5.92 1.85 478 24.8 48.97
6 103.219 3.14 48.28
7 152.113 7.15 1.51633 64.1 47.94
8 -89.878 0.17 47.50
9 -1264.119 1.50 1.80610 40.9 45.42
10 133.896 (Variable) 44.24
11 109.702 1.50 1.85478 24.8 45.42
12 58.954 10.15 1.53775 74.7 45.20
13 -85.054 (variable) 45.46
14* 64.664 8.16 1.49700 81.5 45.34
15* -156.526 (variable) 44.83
16 -47.610 0.90 1.77250 49.6 19.09
17 31.184 3.05 1.80809 22.8 19.14
18 109.235 (Variable) 19.15
19 (Aperture) ∞ 1.47 19.38
20 24.085 5.79 1.48749 70.2 19.92
21 -31.165 0.90 1.88300 40.8 19.51
22 -56.403 6.00 19.49
23 31.758 0.90 1.88300 40.8 16.73
24 18.669 3.96 1.43875 94.9 16.04
25 -203.112 11.44 15.46
26 -16.218 0.80 1.77250 49.6 15.24
27 -24.480 42.99 15.89
Image plane ∞

Aspherical data First surface
K = 0.00000e+000 A 4= 1.81649e-006 A 6=-4.09455e-011 A 8=-5.99215e-013 A10= 6.41193e-016 A12=-2.08385e-019

14th surface
K = 0.00000e+000 A 4=-8.62362e-007 A 6= 1.25171e-009 A 8=-3.36368e-012 A10= 4.47009e-015 A12=-1.06790e-018

Surface 15
K = 0.00000e+000 A 4=-7.88592e-007 A 6= 1.66338e-009 A 8=-4.52285e-012 A10= 7.05505e-015 A12=-2.99173e-018

Various data Zoom ratio 4.44
Wide-angle mid-telephoto focal length 18.00 40.00 80.00
F number 4.13 4.13 4.13
Half angle of view 40.82 21.24 11.00
Image height 15.55 15.55 15.55
Total lens length 238.31 238.31 238.31
BF 42.99 42.99 42.99

d10 64.50 23.77 10.89
d13 1.47 10.86 5.97
d15 2.42 41.26 81.78
d18 32.11 24.61 1.86

Entrance pupil position 35.48 49.60 71.68
Exit pupil position -20.30 -20.30 -20.30
Front principal point position 48.37 64.32 50.56
Rear principal point position 24.99 2.99 -37.00

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -36.43 39.79 5.83 -24.56
2 11 116.06 11.65 4.95 -2.58
3 14 92.94 8.16 1.61 -3.90
4 16 -44.00 3.95 0.69 -1.47
5 19 45.46 31.27 -10.95 -29.12

<Numerical Example 6>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 67.983 2.70 1.69680 55.5 66.64
2 27.111 16.30 51.03
3 99.354 1.80 1.48749 70.2 49.69
4 61.225 16.32 47.13
5 -60.402 1.80 1.69 680 55.5 41.37
6 177.264 6.15 40.82
7 229.508 3.29 2.00069 25.5 41.44
8 -424.453 (Variable) 41.97
9* 116.015 9.34 1.58913 61.1 43.88
10 -45.548 1.50 1.85478 24.8 44.19
11 -62.414 (variable) 45.11
12 73.239 1.50 1.85478 24.8 42.99
13 43.605 0.20 41.80
14 44.292 8.94 1.59522 67.7 41.84
15 -107.079 (variable) 41.51
16 -39.413 0.80 1.77250 49.6 23.58
17 23.512 3.32 1.84666 23.8 23.92
18 66.960 (variable) 23.93
19 59.385 6.68 1.59522 67.7 24.32
20 -21.542 1.00 2.00069 25.5 24.39
21 -30.830 (variable) 25.04
22 (Aperture) ∞ 1.50 19.04
23 26.074 0.80 1.88300 40.8 18.15
24 14.433 3.47 1.71736 29.5 17.17
25 31.777 9.17 16.46
26 70.256 0.80 1.83400 37.2 14.21
27 24.353 4.72 1.43875 94.9 14.26
28 -56.457 1.21 14.94
29 -34.460 0.90 1.85478 24.8 15.11
30 -51.671 48.64 15.47
Image plane ∞

Aspherical data First surface
K = 1.85387e+000 A 4= 1.68187e-006 A 6=-4.30359e-012 A 8=-5.10776e-014 A10= 6.92020e-017 A12= 1.64138e-019

Side 9
K =-1.01143e+002 A 4= 6.99804e-006 A 6=-2.58924e-008 A 8= 8.45204e-011 A10=-2.08114e-013 A12= 3.37066e-016 A14=-3.12808e-019 A16 = 1.25068e-022

Various data Zoom ratio 4.17
Wide-angle mid-telephoto focal length 18.00 40.00 74.99
F number 3.99 4.00 4.00
Half angle of view 40.82 21.24 11.71
Image height 15.55 15.55 15.55
Total lens length 234.71 234.71 234.71
BF 48.64 48.64 48.64

d 8 59.04 18.66 1.50
d11 1.12 24.81 16.31
d15 1.90 18.59 44.26
d18 19.11 10.12 1.00
d21 0.68 9.66 18.79

Entrance pupil position 38.73 48.01 71.69
Exit pupil position -17.25 -17.25 -17.25
Front principal point position 51.81 63.73 61.33
Rear principal point position 30.64 8.64 -26.35

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -32.81 48.35 11.70 -29.92
2 9 78.52 10.84 4.53 -2.31
3 12 91.57 10.64 3.17 -3.58
4 16 -33.82 4.12 0.92 -1.29
5 19 43.06 7.68 3.21 -1.63
6 22 -339.62 22.58 45.25 22.68

<Numerical Example 7>
Unit mm

Surface data Surface number i ri di ndi vdi Effective diameter
1* 320.414 3.00 1.60311 60.6 78.98
2 27.028 15.24 51.79
3 51.222 2.40 1.49700 81.5 49.18
4 27.260 8.20 42.19
5 60.893 2.40 1.59522 67.7 41.01
6 32.938 12.34 37.74
7 -42.557 1.50 1.59522 67.7 37.08
8 408.428 0.18 38.18
9 67.796 2.88 1.72047 34.7 39.07
10 96.765 1.96 38.95
11 71.100 8.69 1.51742 52.4 39.49
12 -51.973 0.70 39.34
13 179.754 1.71 1.83400 37.2 36.10
14 52.391 (variable) 35.21
15 95.100 1.20 1.80100 35.0 36.20
16 34.300 9.07 1.59522 67.7 36.41
17 -148.817 0.20 37.01
18 78.792 4.50 1.59522 67.7 37.77
19 -229.536 1.70 1.80000 29.8 37.92
20 -1016.870 0.20 38.19
21 59.397 8.30 1.49700 81.5 38.86
22 -75.642 (variable) 38.58
23 -54.901 1.00 1.88300 40.8 23.82
24 30.136 5.88 1.85478 24.8 23.74
25 -48.474 1.00 1.88300 40.8 23.73
26 75.303 (variable) 23.73
27 49.976 4.30 1.76385 48.5 24.32
28 -89.707 (variable) 24.20
29 675.544 1.40 1.48749 70.2 22.06
30 -144.123 0.50 21.86
31 (Aperture) ∞ 9.30 21.48
32 -45.268 1.00 1.90366 31.3 18.00
33 48.957 3.82 1.80809 22.8 17.96
34 -85.123 1.44 17.97
35 158.362 1.00 1.91650 31.6 17.61
36 20.609 5.29 1.49 700 81.5 18.08
37 -52.169 3.44 19.32
38 54.374 5.91 1.49700 81.5 22.75
39 -26.763 1.20 1.85478 24.8 23.26
40* -40.114 45.10 23.99
Image plane ∞

Aspherical data First surface
K = 2.57611e+001 A 4= 5.28768e-006 A 6=-3.31840e-009 A 8= 2.06800e-012 A10=-7.07281e-016 A12= 1.21844e-019

Surface 40
K = 0.00000e+000 A 4=-2.63603e-006 A 6=-1.85163e-008 A 8= 1.28750e-010 A10=-6.79797e-013 A12= 1.20449e-015

Various data Zoom ratio 2.50
Wide-angle mid-telephoto focal length 12.00 19.00 30.00
F number 2.80 2.80 2.80
Half angle of view 52.34 39.30 27.40
Image height 15.55 15.55 15.55
Total lens length 220.67 220.67 220.67
BF 45.10 45.10 45.10

d14 18.96 8.80 3.73
d22 1.87 17.41 31.70
d26 20.88 13.93 1.43
d28 1.00 2.57 5.85

Entrance pupil position 28.73 31.11 34.34
Exit pupil position -40.15 -40.15 -40.15
Front principal point position 39.04 45.87 53.78
Rear principal point position 33.10 26.10 15.10

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -17.06 61.20 13.45 -31.19
2 15 37.39 25.17 9.54 -7.22
3 23 -33.10 7.88 1.73 -2.37
4 27 42.38 4.30 0.88 -1.58
5 29 130.30 34.31 42.49 19.77

U1 First lens group U2 Second lens group U3 Third lens group (middle lens group)
U4 4th lens group (Medium lens group)
U5 Fifth lens group (Examples 1 to 5, 7: final lens group, Example 6: medium lens group)
U6 Sixth Lens Group (Example 6: Final Lens Group)
SP aperture stop

Claims (11)

From the object side to the image side,
A first lens group that includes a negative lens closest to the object side, includes two or more negative lenses and one or more positive lenses, does not move for zooming, and has a negative refractive power;
A second lens group that moves on the optical axis for zooming and has a positive refractive power;
A plurality of lens groups including two or more lens groups that move on the optical axis for zooming;
A final lens group that includes a positive lens, a negative lens, and an aperture stop, does not move for zooming, and has a positive refractive power,
Have
The intervals between adjacent lens groups change due to zooming,
The plurality of lens groups includes a third lens group having a positive refractive power closest to the object side,
The focal length of the first lens group is f1, the focal length of the final lens group is fn, and the difference between the position at the wide-angle end and the position at the telephoto end of the second lens group is m2. Of the plurality of lens groups, the difference between the positions at the wide-angle end and the position at the telephoto end of the lens group having the largest difference is mn,
0<|f1/fn|<1.5
0.8<|m2/mn|<3.0
A zoom lens that satisfies the following conditional expression. The zoom lens according to claim 1, wherein the first lens group includes a lens that moves on an optical axis for focusing. The first lens group includes an eleventh partial lens group having a negative refractive power that does not move for focusing, and a twelfth partial lens group having a positive or negative refractive power that moves on the optical axis for focusing. And a focal length of the eleventh partial lens group is f11 and a focal length of the twelfth partial lens group is f12.
0<|f11/f12|<0.6
The zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied. The first lens group includes an eleventh partial lens group having a negative refractive power that does not move for focusing, and a twelfth partial lens group having a positive or negative refractive power that moves on the optical axis for focusing. It is composed of a lens group and a thirteenth partial lens group having a positive or negative refractive power, and the focal length of the eleventh partial lens group is f11.
1.0<f11/f1<3.0
The zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied. The focal length of the front Stories second lens group and f2, the focal length of the third lens group as f3,
−1.0<f1×(f2+f3)/(f2×f3)<−0.3
The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied. Wherein the plurality of lens groups includes, in order from the object side to the image side and a fourth lens group having a third lens unit and the negative refractive power, at the wide-angle end and the telephoto end when the infinity light flux enters the The lateral magnifications of the second lens group are β2w and β2t, and the lateral magnifications of the third lens group at the wide-angle end and the telephoto end are β3w and β3t, respectively, and the zoom lens is at the wide-angle end and the telephoto end. Let fo and ft be the focal lengths of
0.5<(fw×β2t×β3t)/(ft×β2w×β3w)<1.0
The zoom lens according to claim 5, wherein the following conditional expression is satisfied. The focal length of the front Symbol fourth lens group as f4,
0.4<f1/f4<1.2
The zoom lens according to claim 6 , wherein the following conditional expression is satisfied. From the object side to the image side,
A first lens group that includes a negative lens closest to the object side, includes two or more negative lenses and one or more positive lenses, does not move for zooming, and has a negative refractive power;
A second lens group that moves on the optical axis for zooming and has a positive refractive power;
A plurality of lens groups including two or more lens groups that move on the optical axis for zooming;
A final lens group that includes a positive lens, a negative lens, and an aperture stop, does not move for zooming, and has a positive refractive power,
Have
The intervals between adjacent lens groups change due to zooming,
The first lens group includes an eleventh partial lens group having a negative refractive power that does not move for focusing, and a twelfth partial lens group having a positive or negative refractive power that moves on the optical axis for focusing. A lens unit and a thirteenth partial lens unit having a positive or negative refractive power,
The focal length of the first lens group is f1, the focal length of the final lens group is fn, and the difference between the position at the wide-angle end and the position at the telephoto end of the second lens group is m2. Of the plurality of lens groups, the difference of the lens group having the largest difference between the position at the wide-angle end and the position at the telephoto end is mn, and the focal length of the eleventh partial lens group is f11.
0<|f1/fn|<1.5
0.8<|m2/mn|<3.0
1.0<f11/f1<3.0
A zoom lens that satisfies the following conditional expression. The plurality of lens groups includes a third lens group having a positive refractive power closest to the object side, the focal length of the second lens group is f2, and the focal length of the third lens group is f3.
−1.0<f1×(f2+f3)/(f2×f3)<−0.3
The zoom lens according to claim 8, wherein the following conditional expression is satisfied. The plurality of lens groups include a third lens group having a negative refractive power closest to the object side, and the focal length of the second lens group is f2,
-1.0<f1/f2<-0.3
The zoom lens according to claim 8 , wherein the following conditional expression is satisfied. A zoom lens according to any one of claims 1 to 10 ,
An image sensor for receiving the image formed by the zoom lens,
An image pickup apparatus comprising:

Images