Zoom lens and imaging device

Abstract

For example, the aim is to provide a zoom lens that is advantageous in terms of being small, lightweight, and having high optical performance across the entire zoom range. [Solution] The zoom lens has, in order from the object side, a fixed positive first group for zooming, two to four movable groups that move during zooming, and a fixed positive subsequent group for zooming, wherein the spacing between adjacent lens groups changes during zooming, and the subsequent group consists of a first subgroup and a second subgroup in order from the object side, wherein the second subgroup consists of the combination of lens components in the subsequent group that has the greatest positive refractive power among the combinations of lens components in the subsequent group excluding the lens component closest to the object, and the sum of the thicknesses of the lens components in the first subgroup along the optical axis, the distance along the optical axis from the surface closest to the object of the first subgroup to the surface closest to the object of the second subgroup, the focal length of the first subgroup, and the focal length of the subsequent group are appropriately set.

Description

Technical Field

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

Background Art

[0002] Zoom lenses used in imaging devices such as television cameras, movie cameras, surveillance cameras, video cameras, and still cameras are required to be small and lightweight for high operability and to have high optical performance.

[0003] As such a zoom lens, in order from the object side, there is known a zoom lens having a first lens group with a positive refractive power that does not move for zooming, a moving lens group composed of two or more lens groups that move in zooming, and a subsequent lens group with a positive refractive power that does not move for zooming, and the subsequent lens group is composed of a first sub-lens group and a second sub-lens group in order from the object side.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the zoom lens having the above-described configuration, since the lens diameter of the second sub-lens group is determined by the off-axis ray height, it is necessary to reduce the off-axis ray height incident on the second sub-lens group in order to reduce the size. By increasing the refractive power of the first sub-lens group, it is possible to reduce the off-axis ray height incident on the second sub-lens group, but if the refractive power is excessively strong, aberration correction becomes difficult.

[0006] Therefore, the present invention aims to provide a zoom lens that is advantageous in terms of being small and lightweight, and having high optical performance across the entire zoom range. [Means for solving the problem]

[0007] To achieve the above objective, the zoom lens of the present invention comprises, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, two to four movable lens groups that move during zooming, and a subsequent lens group with positive refractive power that does not move for zooming, wherein the spacing between adjacent lens groups changes during zooming.

[0008] The aforementioned successor lens group consists of a first sub-lens group and a second sub-lens group, arranged in order from the object side to the image side, and the second sub-lens group consists of the combination of lens components in the aforementioned successor lens group, excluding the lens component closest to the object, that has the greatest positive refractive power.

[0009] Let dFRG be the sum of the thicknesses of the lens components in the first sub-lens group along the optical axis, dFR be the distance along the optical axis from the object-side surface of the first sub-lens group to the object-side surface of the second sub-lens group, fFR be the focal length of the first sub-lens group, and fR be the focal length of the subsequent lens group. 0.89 <dFRG / dFR<1 fR / fFR < 0.7 It is characterized by satisfying the following conditional expression. [Effects of the Invention]

[0010] According to the present invention, for example, it is possible to provide a zoom lens that is advantageous in terms of being small and lightweight, and having high optical performance across the entire zoom range. [Brief explanation of the drawing]

[0011] [Figure 1] Cross-sectional view of a zoom lens at the wide-angle end and infinity focus for Numerical Example 1 [Figure 2]Aberration diagrams at (a) wide-angle end, (b) f = 27.8 mm, and (c) telephoto end and at infinity focus of Numerical Example 1 [Figure 3] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 2 [Figure 4] Aberration diagrams at (a) wide-angle end, (b) f = 75.6 mm, and (c) telephoto end and at infinity focus of Numerical Example 2 [Figure 5] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 3 [Figure 6] Aberration diagrams at (a) wide-angle end, (b) f = 59.2 mm, and (c) telephoto end and at infinity focus of Numerical Example 3 [Figure 7] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 4 [Figure 8] Aberration diagrams at (a) wide-angle end, (b) f = 60.6 mm, and (c) telephoto end and at infinity focus of Numerical Example 4 [Figure 9] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 5 [Figure 10] Aberration diagrams at (a) wide-angle end, (b) f = 69.9 mm, and (c) telephoto end and at infinity focus of Numerical Example 5 [Figure 11] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 6 [Figure 12] Aberration diagrams at (a) wide-angle end, (b) f = 64.7 mm, and (c) telephoto end and at infinity focus of Numerical Example 6 [Figure 13] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 7 [Figure 14] Aberration diagrams at (a) wide-angle end, (b) f = 38.0 mm, and (c) telephoto end and at infinity focus of Numerical Example 7 [Figure 15] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 8 [Figure 16] Aberration diagrams at (a) wide-angle end, (b) f = 84.9 mm, and (c) telephoto end and at infinity focus of Numerical Example 8 [Figure 17] Cross-sectional view of the zoom lens at the wide-angle end and at infinity focus of Numerical Example 9 [Figure 18]Aberration diagrams at (a) wide-angle end, (b) f = 76.4 mm, and (c) telephoto end and focused at infinity for Numerical Example 9 [Figure 19] Cross-sectional view of the zoom lens at the wide-angle end and focused at infinity for Numerical Example 10 [Figure 20] Aberration diagrams at (a) wide-angle end, (b) f = 70.0 mm, and (c) telephoto end and focused at infinity for Numerical Example 10 [Figure 21] Schematic diagram showing the difference in off-axis ray height depending on the ratio of the lenses occupying the region closer to the object side than the second sub-lens group within the subsequent lens group [Figure 22] Schematic diagram of the main part of the imaging device of the present invention

Mode for Carrying Out the Invention

[0012] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. First, the characteristics of the zoom lens of the present invention will be described in accordance with each conditional expression. The zoom lens of the present invention defines the ratio of the thickness on the optical axis of the lens in the first sub-lens group of the subsequent lens group with positive refractive power that does not move for zooming, and the focal length of the first sub-lens group in order to achieve high optical performance over a small size and lightweight and the entire zoom range. Specifically, it enables the provision of a small and lightweight zoom lens having a high optical performance with an F-number of about 1.4 to 2.2 and a zoom ratio of about 2.0 to 3.5.

[0013] The zoom lens of the present invention includes, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, a moving lens group composed of two or more and four or less lens groups that move during zooming, and a subsequent lens group with positive refractive power that does not move for zooming.

[0014] The subsequent lens group consists of a first sub-lens group and a second sub-lens group, arranged in order from the object side to the image side. When one lens component is considered as one single lens or one cemented lens, the second sub-lens group is the lens group that, among the lens groups consisting of one lens component or a combination of multiple continuously arranged lens components, is positioned closer to the image side than the lens component closest to the object in the subsequent lens group, and has the greatest positive refractive power as a whole (minimum focal length). Among the subsequent lens groups, the lens group closer to the object than the second sub-lens group is designated as the first sub-lens group.

[0015] Let dFRG be the sum of the thicknesses of the lens components along the optical axis in the first sub-lens group, dFR be the distance along the optical axis from the object-side surface of the first sub-lens group to the object-side surface of the second sub-lens group, fFR be the focal length of the first sub-lens group, and fR be the focal length of the subsequent lens group. 0.89 <dFRG / dFR<1···(1) fR / fFR < 0.7 (2) The following condition is met.

[0016] The optical effect of the subsequent lens group of the present invention having the above-described configuration will now be explained. Figure 21 is an explanatory diagram showing how off-axis rays passing through the aperture and the subsequent lens group in a zoom lens like the present invention change depending on the proportion of lenses that occupy the area on the object side (the area where the first sub-lens group is located) within the subsequent lens group compared to the second sub-lens group. Figure 21 shows the behavior of off-axis rays in a subsequent lens group in which two types of first sub-lens groups (solid line, dashed line) with different total thicknesses on the optical axis are arranged. As shown in Figure 21, the proportion of lenses occupying the first sub-lens group is larger for the solid line than for the dashed line. When the ray height of the off-axis rays incident on the first sub-lens group is the same, the height of the off-axis rays incident on the second sub-lens group, where the proportion of lenses in the first sub-lens group is larger, becomes lower, and as a result, the lens diameter of the second sub-lens group can be reduced.

[0017] Equation (1) defines the ratio of the total thickness dFRG of the lenses constituting the first sub-lens group along the optical axis to the distance dFR along the optical axis from the object-side surface of the first sub-lens group to the object-side surface of the second sub-lens group. By satisfying equation (1), miniaturization of the zoom lens is achieved. By increasing the proportion of lenses that occupy the first sub-lens group, the height of off-axis rays incident on the second sub-lens group can be reduced, and the lens diameter of the second sub-lens group can be reduced. If the lower limit of equation (1) is not satisfied, the proportion of lenses that occupy the first lens group becomes small, so the height of off-axis rays incident on the second sub-lens group becomes high, the lens diameter increases, and miniaturization becomes difficult. Preferably, equation (1) is set as follows. 0.90 <dFRG / dFR<1···(1a) More preferably, equation (1a) should be set as follows: 0.92 <dFRG / dFR<1···(1b)

[0018] Equation (2) defines the ratio of the focal length fFR of the first sub-lens group to the focal length fR of the subsequent lens group. By satisfying equation (2), both miniaturization of the zoom lens and high optical performance are achieved. If the upper limit of equation (2) is not satisfied, the positive refractive power of the first sub-lens group relative to the entire subsequent lens group becomes strong, which is advantageous in terms of miniaturization as it can lower the height of off-axis rays, but aberration correction becomes difficult. Preferably, equation (2) is set as follows. fR / fFR < 0.5 (2a) More preferably, equation (2a) should be set as follows: fR / fFR < 0.4 (2b) As a further embodiment of the zoom lens of the present invention, when the focal length of the lens component closest to the object in the first sub-lens group is fFRF, fR / fFRF < 0.7 ···(3) The following condition is met. By satisfying equation (3), the zoom lens achieves both miniaturization and high optical performance. If the upper limit of equation (3) is not met, the refractive power of the lens component closest to the object in the first sub-lens becomes stronger than that of the entire subsequent lens group, which is advantageous in terms of miniaturization, but makes aberration correction difficult. Preferably, equation (3) is set as follows. fR / fFRF < 0.5 (3a) More preferably, equation (3a) should be set as follows: fR / fFRF < 0.4 ···(3b)

[0019] As a further embodiment of the zoom lens of the present invention, the distance along the optical axis from the object-side surface of the successor lens group to the image-side principal point of the successor lens group is dpp, and the distance along the optical axis from the object-side surface of the successor lens group to the image plane is dRI. 0.20 <dpp / dRI<1···(4) The following condition is met. By satisfying equation (4), the zoom lens achieves both miniaturization and high optical performance. If the lower limit of equation (4) is not met, the distance from the object-side surface of the subsequent lens group to the image plane becomes large, which is disadvantageous for miniaturizing the lens. Preferably, equation (4) should be set as follows: 0.25 <dpp / dRI<1···(4a) More preferably, equation (4a) should be set as follows: 0.30 <dpp / dRI<1···(4b)

[0020] A further form of the zoom lens of the present invention is characterized in that the moving lens group has three or more lens groups. By zooming with three or more lens groups, it becomes easier to correct the aberrations that have increased due to the increased refractive power of each lens group for miniaturization, and high optical performance can be achieved throughout the entire zoom range.

[0021] A further embodiment of the zoom lens of the present invention is characterized in that the zoom lens includes an aperture, and the aperture moves along the optical axis during zooming. By moving the aperture during zooming, for example, at the wide-angle end, it is possible to position it on the object side and position the entrance pupil on the object side, thereby lowering the off-axis ray height of the first lens group and reducing the lens diameter of the first lens group.

[0022] A further form of the zoom lens of the present invention is characterized in that the lens component closest to the object in the first sub-lens group is a cemented lens. By doing so, the proportion of the lens occupying the area in which the first sub-lens group is located can be increased, so the height of off-axis light rays incident on the second sub-lens group can be lowered, making it easier to reduce the lens diameter of the second sub-lens group. Furthermore, chromatic aberration correction also becomes easier.

[0023] As a further embodiment of the zoom lens of the present invention, the average refractive index with respect to the d line of all lens components in the first sub-lens group is Ndave, 1.60 <Ndave···(5) The following condition is met. The effect of the first sub-lens group on lowering the height of off-axis rays increases as the refractive index of the constituent lenses increases. By satisfying equation (5), the miniaturization of the zoom lens is achieved. If the lower limit of equation (5) is not met, the effect of lowering the height of off-axis rays incident on the second sub-lens group decreases, the effect of reducing the lens diameter of the second sub-lens group decreases, and it becomes difficult to miniaturize the lens. Preferably, equation (5) should be set as follows: 1.62 <Ndave···(5a) More preferably, equation (5a) should be set as follows: 1.64 <Ndave···(5b)

[0024] As a further embodiment of the zoom lens of the present invention, let dn be the thickness of each lens in the first sub-lens group along the optical axis, and Nd be the refractive index of each lens in the first sub-lens group with respect to the d line, and let dFRGN be the sum of the products of dn and Nd in the first sub-lens group. 1.0 <dFRGN / dFR···(6) The following condition is met. The effect of the first sub-lens group on reducing the height of off-axis rays is greater as the refractive power of the constituent lenses increases and as the proportion of lenses occupying the first sub-lens group increases. By satisfying equation (6), the miniaturization of the zoom lens is achieved. If the lower limit of equation (6) is not met, the effect of reducing the height of off-axis rays incident on the second sub-lens group decreases, the effect of reducing the lens diameter of the second sub-lens group decreases, and it becomes difficult to miniaturize the lens. Preferably, equation (6) should be set as follows: 1.2 <dFRGN / dFR···(6a) More preferably, equation (6a) should be set as follows: 1.3 <dFRGN / dFR···(6b)

[0025] Furthermore, the imaging device of the present invention is characterized by having a zoom lens of each embodiment and an image sensor having a predetermined effective imaging range for receiving the image formed by the zoom lens.

[0026] The specific configuration of the zoom lens of the present invention will be described below by numerical values ​​corresponding to Examples 1 to 9 and by the characteristics of the lens configurations of Examples 1 to 9. [Examples]

[0027] Figure 1 is a cross-sectional view of a zoom lens, which is Embodiment 1 of the present invention (Numerical Embodiment 1), when it is in focus at the wide-angle end and at infinity. In the cross-sectional view, the left side corresponds to the object side and the right side corresponds to the image side. In Figure 2, (a) shows the longitudinal aberration diagram of Numerical Embodiment 1 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 1 at a focal length of 27.8 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 1 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity. The focal length values ​​are the values ​​expressed in millimeters for the Numerical Embodiments described later. This is the same for all the Numerical Embodiments described below.

[0028] In Figure 1, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. Furthermore, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0029] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the fourth lens group U4 and is positioned closest to the object in the fourth lens group U4. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0030] In the longitudinal aberration diagram, the solid line and dashed line in spherical aberration represent the e-line and g-line, respectively. The dashed line and solid line in astigmatism represent the meridional image plane and sagittal image plane, respectively, and the dashed line in chromatic aberration represents the g-line. ω is the half-angle of view, and Fno is the F-number. In the longitudinal aberration diagram, spherical aberration is drawn on a scale of 0.4 mm, astigmatism on 0.4 mm, distortion on 10%, and chromatic aberration on 0.1 mm. In each of the following embodiments, the wide-angle end and telephoto end refer to the zoom position when the second lens group U2 for zoom is located at both ends of the range in which it can move along the optical axis relative to the mechanism.

[0031] The first lens group U1 corresponds to the 1st to 13th surfaces. The second lens group U2 corresponds to the 14th to 20th surfaces, the third lens group U3 corresponds to the 21st to 22nd surfaces, and the fourth lens group U4 corresponds to the 24th to 25th surfaces. The fifth lens group U5 corresponds to the 26th to 38th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 26th to 28th surfaces. The second sub-lens group U52 corresponds to the 29th to 38th surfaces.

[0032] Numerical Example 1, corresponding to Example 1 above, will now be described. In all numerical examples, not just Numerical Example 1, i indicates the order of the surfaces (optical surfaces) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di indicates the distance (on the optical axis) between the i-th surface and the (i+1)-th surface from the object side. Also, ndi and νdi represent the refractive index and Abbe number of the medium (optical material) between the i-th surface and the (i+1)-th surface with respect to the d line, and BF represents the back focus in air equivalent. The aspherical shape is expressed by the following equation, where the X-axis is in the direction of the optical axis, the H-axis is perpendicular to the optical axis, the direction of light propagation is positive, R is the radius of paraxial curvature, k is the cone constant, and A3 to A16 are aspherical coefficients. Also, "eZ" is "×10 -Z It means "...".

number

[0033] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact, lightweight zoom lens with high optical performance across the entire zoom range is achieved. However, while it is essential that the zoom lens of the present invention satisfies equation (1), it is not necessary to satisfy equations (2) to (6). However, if at least one of equations (2) to (6) is satisfied, even better effects can be achieved. The same applies to other embodiments.

[0034] Figure 22 is a schematic diagram of an imaging device (television camera system) using the zoom lens of each embodiment as the imaging optical system.

[0035] In Figure 22, 101 is a zoom lens from one of Examples 1 to 9. 124 is a camera. The zoom lens 101 is detachable from the camera 124. 125 is an imaging device configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 has a first lens group F, a zoom section LZ, and a rear group R for image formation. The first lens group F includes a focusing lens group. The zoom section LZ includes a second lens group, a third lens group that move along the optical axis during zooming, and a fourth lens group that moves along the optical axis to correct image plane fluctuations associated with zooming. SP is the aperture diaphragm. 114 and 115 are drive mechanisms such as helicoids and cams that drive the first lens group F and the zoom section LZ in the optical axis direction, respectively. 116 to 118 are motors (driving means) that electrically drive the drive mechanisms 114 and 115 and the aperture diaphragm SP. 119-121 are detectors such as encoders, potentiometers, or photosensors for detecting the position of the first lens group F and zoom section LZ on the optical axis, and the aperture diameter of the aperture diaphragm SP. In camera 124, 109 is a glass block corresponding to the optical filter and color separation optical system within camera 124, and 110 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor that receives the subject image formed by the zoom lens 101. Also, 111 and 122 are CPUs that control various drives of camera 124 and zoom lens 101.

[0036] In this way, by adapting the zoom lens of the present invention to television cameras, movie cameras, and digital still cameras, an imaging device with compact size, light weight, and high optical performance can be realized. [Examples]

[0037] Figure 3 is a cross-sectional view of the zoom lens, which is Embodiment 2 of the present invention (Numerical Embodiment 2), when it is in focus at the wide-angle end and at infinity. In Figure 4, (a) shows the longitudinal aberration diagram of Numerical Embodiment 2 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 2 at a focal length of 75.6 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 2 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0038] In Figure 3, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. Furthermore, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0039] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the fourth lens group U4 and is positioned closest to the object in the fourth lens group U4. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0040] The first lens group U1 corresponds to the 1st to 14th surfaces. The second lens group U2 corresponds to the 15th to 21st surfaces, the third lens group U3 corresponds to the 22nd to 23rd surfaces, and the fourth lens group U4 corresponds to the 25th to 26th surfaces. The fifth lens group U5 corresponds to the 27th to 39th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 27th to 29th surfaces. The second sub-lens group U52 corresponds to the 30th to 39th surfaces.

[0041] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0042] Figure 5 is a cross-sectional view of the zoom lens, which is Embodiment 3 of the present invention (Numerical Embodiment 3), when it is in focus at the wide-angle end and at infinity. In Figure 6, (a) shows the longitudinal aberration diagram of Numerical Embodiment 3 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 3 at a focal length of 59.2 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 3 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity. In Figure 5, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with positive refractive power that moves during zooming. In addition, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0043] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the fourth lens group U4 and is positioned closest to the object in the fourth lens group U4. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0044] The first lens group U1 corresponds to the 1st to 17th surfaces. The second lens group U2 corresponds to the 18th to 25th surfaces, the third lens group U3 corresponds to the 26th to 28th surfaces, and the fourth lens group U4 corresponds to the 30th to 34th surfaces. The fifth lens group U5 corresponds to the 35th to 47th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 35th to 37th surfaces. The second sub-lens group U52 corresponds to the 38th to 47th surfaces.

[0045] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0046] Figure 7 is a cross-sectional view of the zoom lens, which is Embodiment 4 (Numerical Embodiment 4) of the present invention, when it is in focus at the wide-angle end and at infinity. In Figure 8, (a) shows the longitudinal aberration diagram of Numerical Embodiment 4 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 4 at a focal length of 60.6 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 4 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0047] In Figure 7, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. Furthermore, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0048] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the fourth lens group U4 and is positioned closest to the object in the fourth lens group U4. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0049] The first lens group U1 corresponds to the 1st to 18th surfaces. The second lens group U2 corresponds to the 19th to 27th surfaces, the third lens group U3 corresponds to the 28th to 30th surfaces, and the fourth lens group U4 corresponds to the 32nd to 36th surfaces. The fifth lens group U5 corresponds to the 37th to 49th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 37th to 39th surfaces. The second sub-lens group U52 corresponds to the 40th to 49th surfaces.

[0050] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0051] Figure 9 is a cross-sectional view of the zoom lens, which is Embodiment 5 of the present invention (Numerical Embodiment 5), when it is in focus at the wide-angle end and at infinity. In Figure 10, (a) shows the longitudinal aberration diagram of Numerical Embodiment 5 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 5 at a focal length of 69.9 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 5 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0052] In Figure 9, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. In addition, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0053] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the fourth lens group U4 and is positioned closest to the object in the fourth lens group U4. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0054] The first lens group U1 corresponds to the 1st to 14th surfaces. The second lens group U2 corresponds to the 15th to 21st surfaces, the third lens group U3 corresponds to the 22nd to 24th surfaces, and the fourth lens group U4 corresponds to the 26th to 30th surfaces. The fifth lens group U5 corresponds to the 31st to 44th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 31st to 33rd surfaces. The second sub-lens group U52 corresponds to the 34th to 44th surfaces.

[0055] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0056] Figure 11 is a cross-sectional view of a zoom lens, which is Embodiment 6 of the present invention (Numerical Embodiment 6), when it is in focus at the wide-angle end and at infinity. In Figure 12, (a) shows the longitudinal aberration diagram of Numerical Embodiment 6 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 6 at a focal length of 64.7 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 6 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0057] In Figure 11, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end. In addition, it has a third lens group U3 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second lens group U2, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fourth lens group U4 with positive refractive power that does not move for zooming and has an imaging function.

[0058] In this embodiment, the second lens group U2 and the third lens group U3 constitute a zoom system. SP is an aperture diaphragm, positioned between the second lens group U2 and the third lens group U3, and moves independently during zooming. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film plane to which the image formed by the zoom lens is exposed.

[0059] The first lens group U1 corresponds to the 1st to 14th surfaces. The second lens group U2 corresponds to the 15th to 21st surfaces, the third lens group U3 corresponds to the 23rd to 27th surfaces, and the fourth lens group U4 corresponds to the 28th to 41st surfaces. In this embodiment, the fourth lens group U4 is divided into the first sub-lens group U41 and the second sub-lens group U42. The first sub-lens group U41 corresponds to the 28th to 30th surfaces. The second sub-lens group U42 corresponds to the 31st to 41st surfaces.

[0060] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0061] Figure 13 is a cross-sectional view of the zoom lens, which is Embodiment 7 of the present invention (Numerical Embodiment 7), when it is in focus at the wide-angle end and at infinity. In Figure 14, (a) shows the longitudinal aberration diagram of Numerical Embodiment 7 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 7 at a focal length of 38.0 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 7 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0062] In Figure 13, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. Furthermore, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0063] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the fourth lens group U4 and is positioned closest to the object in the fourth lens group U4. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0064] The first lens group U1 corresponds to the 1st to 16th surfaces. The second lens group U2 corresponds to the 17th to 23rd surfaces, the third lens group U3 corresponds to the 24th to 26th surfaces, and the fourth lens group U4 corresponds to the 28th to 32nd surfaces. The fifth lens group U5 corresponds to the 33rd to 46th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 33rd to 35th surfaces. The second sub-lens group U52 corresponds to the 36th to 46th surfaces.

[0065] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0066] Figure 15 is a cross-sectional view of the zoom lens, which is Embodiment 8 (Numerical Embodiment 8) of the present invention, when it is in focus at the wide-angle end and at infinity. In Figure 16, (a) shows the longitudinal aberration diagram of Numerical Embodiment 8 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 8 at a focal length of 84.9 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 8 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0067] In Figure 15, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. In addition, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0068] In this embodiment, the second lens group U2, the third lens group U3, and the fourth lens group U4 constitute the zoom system. SP is the aperture diaphragm and is located on the object side of the fifth lens group U5. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed. The first lens group U1 corresponds to the 1st to 14th surfaces. The second lens group U2 corresponds to the 15th to 21st surfaces, the third lens group U3 corresponds to the 22nd to 24th surfaces, and the fourth lens group U4 corresponds to the 25th to 29th surfaces. The fifth lens group U5 corresponds to the 31st to 44th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 31st to 33rd surfaces. The second sub-lens group U52 corresponds to the 34th to 44th surfaces.

[0069] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0070] Figure 17 is a cross-sectional view of a zoom lens, which is Embodiment 9 of the present invention (Numerical Embodiment 9), when it is in focus at the wide-angle end and at infinity. In Figure 18, (a) shows the longitudinal aberration diagram of Numerical Embodiment 9 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 9 at a focal length of 76.4 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 9 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0071] In Figure 17, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, and a third lens group U3 with negative refractive power that moves during zooming. Furthermore, it has a fourth lens group U4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups U2 and U3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group U5 with positive refractive power that does not move for zooming and has an imaging function.

[0072] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, and the fourth lens group U4. SP is an aperture diaphragm, which is included in the third lens group U3 and is positioned closest to the object in the third lens group U3. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0073] The first lens group U1 corresponds to the 1st to 14th surfaces. The second lens group U2 corresponds to the 15th to 21st surfaces, the third lens group U3 corresponds to the 23rd to 25th surfaces, and the fourth lens group U4 corresponds to the 26th to 30th surfaces. The fifth lens group U5 corresponds to the 31st to 44th surfaces. In this embodiment, the fifth lens group U5 is divided into the first sub-lens group U51 and the second sub-lens group U52. The first sub-lens group U51 corresponds to the 31st to 33rd surfaces. The second sub-lens group U52 corresponds to the 34th to 44th surfaces.

[0074] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved. [Examples]

[0075] Figure 19 is a cross-sectional view of a zoom lens, which is Embodiment 10 of the present invention (Numerical Embodiment 10), when it is in focus at the wide-angle end and at infinity. In Figure 20, (a) shows the longitudinal aberration diagram of Numerical Embodiment 10 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 10 at a focal length of 70.0 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 10 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0076] In Figure 19, the lens system has a first lens group U1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, it has a second lens group U2 with negative refractive power for zooming, which moves towards the image side when zooming from the wide-angle end to the telephoto end, a third lens group U3 with negative refractive power that moves during zooming, and a fourth lens group U4 with negative refractive power that moves during zooming. In addition, it has a fifth lens group U5 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second, third, and fourth lens groups U4, and corrects image plane fluctuations associated with zooming. Furthermore, it has a sixth lens group U6 with positive refractive power that does not move for zooming and has an imaging function.

[0077] In this embodiment, the zoom system is composed of the second lens group U2, the third lens group U3, the fourth lens group U4, and the fifth lens group U5. SP is the aperture diaphragm, which is included in the fifth lens group U5 and is positioned closest to the object in the fifth lens group U5. I is the image plane, and when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, it corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric light. When used as an imaging optical system for film cameras, it corresponds to the film plane to which the image formed by the zoom lens is exposed.

[0078] The first lens group U1 corresponds to the 1st to 14th surfaces. The second lens group U2 corresponds to the 15th to 16th surfaces, the third lens group U3 corresponds to the 17th to 21st surfaces, the fourth lens group U4 corresponds to the 22nd to 24th surfaces, and the fifth lens group U5 corresponds to the 26th to 30th surfaces. The sixth lens group U6 corresponds to the 31st to 44th surfaces. In this embodiment, the sixth lens group U6 is divided into a first sub-lens group U61 and a second sub-lens group U62. The first sub-lens group U61 corresponds to the 31st to 33rd surfaces. The second sub-lens group U62 corresponds to the 34th to 44th surfaces.

[0079] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (6), and by appropriately setting the proportion of lenses in the first sub-lens group and the focal length of the first sub-lens group, a compact and lightweight zoom lens with high optical performance across the entire zoom range is achieved.

[0080] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. A feature of the present invention is that the proportion of lenses occupying the first sub-lens group and the focal length of the first sub-lens group are appropriately set, and the effects of the present invention can be achieved even if the moving lens group and subsequent lens group are in configurations other than those of numerical examples 1 to 10.

[0081] [Numerical Example 1] Unit: mm Surface data Face number rd nd vd 1* 644.897 2.60 1.80400 46.5 2 33.312 23.82 3 -90.880 1.90 1.76385 48.5 4 90.880 6.94 5 123.853 8.48 1.84669 23.9 6 -283.465 5.18 7* 122.670 11.96 1.59522 67.7 8 -96.774 8.91 9 930.317 2.10 1.80518 25.4 10 55.770 10.20 1.43875 94.7 11 627.948 0.20 12 118.704 13.81 1.71300 54.0 13 -75.292 (variable) 14 304.140 1.25 1.49700 81.5 15 42.595 5.50 16 -142.290 1.25 1.83481 42.7 17 57.570 5.05 1.80808 22.7 18 -780.513 5.72 19 -46.620 1.25 1.78800 47.4 20 -86.677 (variable) 21 -156.182 1.40 1.49700 81.5 22 594.177 (variable) 23 (aperture) ∞ 1.00 24 76.077 5.58 1.80610 40.9 25* -270.027 (variable) 26 -729.081 2.00 1.84666 23.8 27 39.572 10.47 1.58313 59.4 28 -146.938 0.25 29 102.898 14.65 1.89286 20.4 30 -30.604 1.45 2.00069 25.5 31 -272.862 3.16 32 74.864 8.91 1.43875 94.7 33 -54.964 0.24 34 47.478 7.11 1.48749 70.2 35 -128.613 1.25 1.85478 24.8 36 33.289 3.81 37 60.048 4.73 1.58913 61.1 38 -171.494 (variable) Image plane ∞ Aspherical data Front page K = 0.00000e+00 A 4= 3.15551e-06 A 6=-1.71560e-09 A 8= 1.17327e-12 A10=-6.92071e-16 A12= 3.30975e-19 A14=-1.05433e-22 A16= 1.56810e-26 Side 7 K = 0.00000e+00 A 4=-1.59446e-06 A 6= 5.75097e-10 A 8=-1.02748e-12 A10= 1.64653e-15 A12=-1.52139e-18 A14= 7.42738e-22 A16=-1.46518e-25 Page 25 K = 0.00000e+00 A 4= 1.36851e-06 A 6= 2.21160e-10 A 8=-2.92464e-13 Various data Zoom ratio 2.40 Wide-angle, Medium, Telephoto Focal length 14.22 27.81 34.12 F number 1.61 1.61 1.61 Half-angle 47.83 29.45 24.71 Image height 15.70 15.70 15.70 Lens length 283.80 283.80 283.80 BF 41.49 41.49 41.49 d13 1.40 40.14 48.94 d20 30.26 2.07 1.44 d22 3.47 8.48 3.45 d25 25.04 9.49 6.35 d38 41.49 41.49 41.49 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 49.85 96.10 58.04 79.25 2 14 -40.50 20.02 6.35 -9.13 3 21 -248.69 1.40 0.19 -0.74 4 23 74.17 6.58 1.68 -2.43 5 26 62.42 58.04 19.25 -18.75

[0082] [Numerical Example 2] Unit: mm Surface data Face number rd nd vd 1 4894.823 7.67 1.48749 70.2 2 -211.875 0.20 3 3353.256 2.75 1.64000 60.1 4 127.549 29.79 5 -99.758 2.15 1.64000 60.1 6 124.862 4.83 1.84666 23.8 7 351.661 4.48 8 703.534 8.59 1.59522 67.7 9 -115.035 0.18 10 196.367 2.20 1.84666 23.8 11 77.363 12.56 1.49700 81.5 12 -227.843 0.20 13 75.213 9.24 1.71300 53.9 14 564.714 (variable) 15 376.135 1.30 1.53775 74.7 16 37.887 6.08 17 -234.380 1.20 1.61340 44.3 18 44.625 4.47 1.96300 24.1 19 168.497 4.56 20 -56.966 1.30 1.83481 42.7 21 -225.873 (variable) 22 -75.200 1.40 1.49700 81.5 23 2801.098 (variable) 24 (aperture) ∞ 1.10 25 96.057 6.32 1.89190 37.1 26* -148.552 (variable) 27 622.321 1.50 1.85478 24.8 28 44.839 13.64 1.58913 61.1 29 -77.966 0.50 30 40.530 7.74 1.43875 94.7 31 1531.876 1.40 1.74000 28.3 32 24.826 9.20 1.65844 50.9 33 123.795 1.58 34 46.468 9.45 1.89286 20.4 35 -50.279 1.30 1.74951 35.3 36 29.266 4.74 37 76.287 7.28 1.83481 42.7 38 -46.203 1.25 2.00069 25.5 39 -391.687 (variable) Image plane ∞ Aspherical data Page 26 K = 0.00000e+00 A 4= 1.09927e-06 A 6=-2.74230e-11 A 8=-1.94467e-14 Various data Zoom ratio 2.90 Wide-angle, Medium, Telephoto Focal length 32.32 75.60 93.62 F-number 1.68 1.67 1.67 Half-angle 25.91 11.73 9.52 Image height 15.70 15.70 15.70 Lens length 287.66 287.66 287.66 BF 40.90 40.90 40.90 d14 2.31 44.64 52.11 d21 34.22 4.94 4.38 d23 7.60 8.47 3.64 d26 30.50 16.58 14.50 d39 40.90 40.90 40.90 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 104.92 84.83 71.03 16.56 2 15 -38.41 18.91 7.06 -7.16 3 22 -147.33 1.40 0.02 -0.91 4 24 66.21 7.41 2.42 -2.05 5 27 71.55 59.58 11.93 -26.12

[0083] [Numerical Example 3] Unit: mm Surface data Face number rd nd vd 1* 171.586 2.90 1.77250 49.6 2 48.604 26.87 3 -92.247 2.40 1.55032 75.5 4 794.162 0.54 5 88.583 4.90 1.53996 59.5 6 142.917 2.95 7 140.067 13.62 1.43700 95.1 8 -129.481 0.12 9 155.096 2.40 1.84666 23.8 10 99.119 13.90 11 62.266 13.05 1.43700 95.1 12 943.907 0.50 13 421.237 2.42 1.51823 58.9 14 114.429 10.47 1.43700 95.1 15 -202.764 0.12 16* 80.530 5.29 1.57099 50.8 17 291.985 (variable) 18* 111.494 1.00 1.90366 31.3 19 29.395 6.69 20 -97.122 1.01 1.49700 81.5 21 33.129 5.64 2.00069 25.5 22 2505.016 3.55 23 -44.468 1.05 1.75520 27.5 24 -44.872 1.01 1.75500 52.3 25 297.805 (variable) 26 502.322 4.42 1.43700 95.1 27 -53.910 1.00 1.85896 22.7 28 -62.721 (variable) 29 (aperture) ∞ 1.50 30 163.512 3.23 1.88300 40.8 31 -177.575 0.12 32 50.203 9.75 1.48749 70.2 33 -53.521 1.00 1.84850 43.8 34 149.207 (variable) 35 268.897 2.00 1.80518 25.4 36 53.128 8.37 1.53996 59.5 37 4143.572 0.75 38 632.637 11.16 1.89286 20.4 39 -42.457 1.45 2.05090 26.9 40 -84.718 3.00 41 97.598 7.81 1.43875 94.7 42 -83.322 0.25 43 39.904 9.54 1.48749 70.2 44 -117.952 1.25 1.85478 24.8 45 28.595 2.99 46 29.896 6.67 1.58913 61.1 47 117.537 (variable) Image plane ∞ Aspherical data Front page K = 0.00000e+00 A 4= 3.59336e-07 A 6=-4.81490e-11 A 8= 4.75719e-14 A10=-8.43358e-17 A12= 9.49237e-20 A14=-6.16206e-23 A16= 2.27900e-26 A18=-4.50977e-30 A20= 3.73117e-34 Page 16 K = 0.00000e+00 A 4=-7.65361e-07 A 6= 1.76164e-10 A 8=-1.75032e-12 A10= 4.18201e-15 A12=-6.46239e-18 A14= 6.23132e-21 A16=-3.67293e-24 A18= 1.20868e-27 A20=-1.70119e-31 Side 18 K = 0.00000e+00 A 4= 3.01818e-07 A 6=-7.72571e-10 A 8= 6.14162e-12 A10=-1.78972e-14 A12= 2.28854e-17 Various data Zoom ratio 3.45 Wide-angle, Medium, Telephoto Focal length 19.88 59.00 68.60 F number 2.17 2.17 2.17 Half-angle 38.30 14.90 12.89 Image height 15.70 15.70 15.70 Lens length: 305.44 305.44 305.45 BF 38.00 37.87 38.01 d17 1.34 59.47 64.27 d25 1.60 3.93 1.59 d28 44.78 4.25 1.38 d34 21.05 1.25 1.54 d47 38.00 37.87 38.01 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 79.23 102.46 76.08 52.18 2 18 -28.29 19.95 5.97 -7.73 3 26 147.63 5.42 3.78 0.16 4 29 107.22 15.60 -7.02 -16.01 5 35 63.91 55.23 10.48 -24.09

[0084] [Numerical Example 4] Unit: mm Surface data Face number rd nd vd 1* 186.612 2.50 1.84850 43.8 2 48.995 29.39 3 -68.262 2.50 1.69560 59.0 4 -104.054 0.12 5 90.387 3.36 1.85896 22.7 6 116.981 4.00 7 177.125 13.59 1.49700 81.5 8 -194.819 0.12 9 141.592 2.20 1.89286 20.4 10 105.264 16.40 11 95.238 9.66 1.43875 94.7 12 -368.349 0.12 13 111.146 2.20 1.84666 23.8 14 55.649 1.50 15 58.238 12.44 1.43875 94.7 16 -901.674 0.12 17 89.403 5.79 1.92119 24.0 18 335.926 (variable) 19* 2745.446 2.00 1.90366 31.3 20 35.337 5.63 21 -149.838 1.01 1.59410 60.5 22 32.262 2.73 1.95375 32.3 23 48.796 1.42 24 54.710 5.20 1.85025 30.1 25 -97.740 3.63 26 -32.274 1.00 1.69560 59.0 27 -85.925 (variable) 28 -82.956 1.00 1.95375 32.3 29 93.486 3.02 1.89286 20.4 30 -371.786 (variable) 31 (aperture) ∞ 1.00 32* 256.588 4.08 1.95375 32.3 33 -76.937 0.12 34 48.922 10.69 1.55032 75.5 35 -153.834 1.00 1.88300 40.7 36 90.789 (Variable) 37 338.368 2.00 1.89286 20.4 38 34.641 9.87 1.59522 67.7 39 216.079 0.57 40 60.637 19.14 1.85896 22.7 41 -42.436 1.50 1.96300 24.1 42 -65.759 0.20 43 208.961 2.25 1.43875 94.7 44 -636.543 0.20 45 36.618 9.18 1.48749 70.2 46 -52.432 1.25 1.85478 24.8 47 34.853 3.90 48 121.626 6.10 1.58913 61.1 49 -373.909 (variable) Image plane ∞ Aspherical data Front page K = 0.00000e+00 A 4= 4.28502e-07 A 6= 5.48914e-09 A 8= 3.49839e-11 A10= 6.92693e-14 A12= 2.66052e-17 A14=-5.25895e-21 A16=-4.05754e-25 A18=-2.80543e-32 A20= 6.25787e-36 A 5=-3.11351e-08 A 7=-5.23285e-10 A 9=-1.79799e-12 A11=-1.81524e-15 A13=-4.77501e-20 A15= 8.16929e-23 A17=-2.23175e-30 A19= 5.84897e-34 Page 19 K = 0.00000e+00 A 4= 1.99058e-06 A 6=-3.25255e-09 A 8= 9.27021e-12 A10=-1.71294e-12 A12= 2.75149e-14 A14= 1.12820e-17 A16=-1.67322e-20 A 5= 1.55355e-08 A 7=-1.93240e-10 A 9= 1.85561e-11 A11=-1.43458e-13 A13=-1.32720e-15 A15= 7.98227e-19 Page 32 K = 0.00000e+00 A 4=-9.62459e-07 A 6=-1.43805e-09 A 8= 2.53947e-11 A10=-2.47377e-13 A12= 1.43860e-15 A14=-5.16769e-18 A16= 1.12112e-20 A18=-1.35067e-23 A20= 6.91898e-27 Various data Zoom ratio 3.45 Wide-angle, Medium, Telephoto Focal length 20.62 60.61 71.15 F-number 1.95 1.94 1.95 Half-angle 37.29 14.52 12.44 Image height 15.70 15.70 15.70 Lens length 305.81 305.81 305.82 BF 40.07 39.96 40.08 d18 1.35 50.70 55.38 d27 30.33 1.67 1.96 d30 7.45 4.66 1.20 d36 20.92 3.15 1.52 d49 40.07 39.96 40.08 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 67.94 106.00 71.57 45.34 2 19 -36.80 22.62 2.90 -13.13 3 28 -102.98 4.02 -0.49 -2.60 4 31 56.05 16.89 -2.29 -11.84 5 37 69.00 56.16 6.30 -25.98

[0085] [Numerical Example 5] Unit: mm Surface data Face number rd nd vd 1 690.771 6.50 1.67270 32.1 2 -302.452 0.20 3 1523.736 3.00 1.88300 40.8 4 129.930 27.57 5 -109.955 2.40 1.88300 40.8 6 307.853 3.34 1.85478 24.8 7 22640.381 2.16 8 -4546.987 7.73 1.67790 55.3 9 -102.463 0.30 10 222.053 2.50 1.84666 23.8 11 94.211 11.14 1.59522 67.7 12 -251.248 0.20 13 78.897 7.82 1.76385 48.5 14 299.270 (Variable) 15 203.629 1.50 1.76385 48.5 16 49.857 3.92 17 418.243 1.50 1.53775 74.7 18 41.142 6.79 1.85478 24.8 19 134.511 3.43 20 -95.137 1.50 1.88300 40.8 21 542.032 (variable) 22 -70.032 4.34 1.89286 20.4 23 -35.659 1.50 1.80100 35.0 24 270.220 (Variable) 25 (aperture) ∞ 1.34 26* 265.714 6.58 1.76385 48.5 27 -109.444 0.20 28 63.017 10.84 1.81600 46.6 29 -98.231 1.50 1.78880 28.4 30 107.323 (variable) 31 -1763.195 1.50 1.89286 20.4 32 51.525 8.44 1.43875 94.9 33 -167.706 0.20 34 159.794 6.41 1.90525 35.0 35 -191.969 0.20 36 52.488 11.30 1.89286 20.4 37 -73.069 1.30 1.79952 42.2 38 -1289.632 2.07 39 -5701.768 1.30 1.85478 24.8 40 23.000 8.77 1.81600 46.6 41 36.892 2.76 42 71.541 8.12 1.81600 46.6 43 -45.276 1.30 1.85478 24.8 44 -246.393 (variable) Image plane ∞ Aspherical data Page 26 K = 0.00000e+00 A 4=-1.15409e-06 A 6= 7.27967e-11 A 8=-1.97332e-13 Various data Zoom ratio 2.88 Wide-angle, Medium, Telephoto Focal length 31.00 69.93 89.14 F number 1.51 1.51 1.51 Half-angle 25.52 11.95 9.43 Image height 14.80 14.80 14.80 Lens length 283.95 283.95 283.95 BF 39.02 39.02 39.02 d14 1.36 45.66 55.38 d21 26.80 4.23 4.72 d24 10.41 6.22 1.53 d30 32.88 15.35 9.83 d44 39.02 39.02 39.02 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 111.98 74.85 63.72 17.16 2 15 -48.26 18.64 7.86 -5.06 3 22 -75.91 5.84 0.25 -2.86 4 25 59.97 20.46 1.60 -9.99 5 31 61.63 53.68 9.91 -22.31

[0086] [Numerical Example 6] Unit: mm Surface data Face number rd nd vd 1 805.954 5.28 1.67270 32.1 2 -497.159 0.20 3 1702.608 3.00 1.88300 40.8 4 71.889 29.48 5 -106.559 2.40 1.88300 40.8 6 -696.425 4.78 1.85478 24.8 7 -427.889 1.99 8 368.225 11.74 1.67790 55.3 9 -118.516 0.30 10 170.272 2.50 1.84666 23.8 11 82.296 14.33 1.59522 67.7 12 -402.972 0.20 13* 81.545 12.35 1.76385 48.5 14 -3116.925 (variable) 15* 131.505 1.50 1.76385 48.5 16 27.929 9.63 17 -121.440 1.50 1.59522 67.7 18 37.424 6.18 1.84666 23.8 19 -1082.835 5.54 20 -30.413 1.50 1.89190 37.1 21 -60.872 (variable) 22 (aperture) ∞ (variable) 23* -500.000 3.00 1.76385 48.5 24 -250.862 0.20 25 112.525 7.21 1.81600 46.6 26 -185.143 1.50 1.84666 23.8 27 -277.169 (variable) 28 135.029 1.50 1.95906 17.5 29 41.448 10.13 1.43875 94.9 30 -200.343 0.17 31 3236.526 1.75 2.00100 29.1 32 -621.857 0.17 33 50.617 10.39 1.89286 20.4 34 -107.502 1.30 1.75500 52.3 35 -942.404 7.74 36 238.942 1.30 1.84666 23.8 37 23.390 5.56 1.75500 52.3 38 35.002 2.85 39 67.564 9.65 1.88300 40.8 40 -35.792 1.30 1.84666 23.8 41 -246.393 (variable) Image plane ∞ Aspherical data Page 13 K = 0.00000e+00 A 4=-8.49815e-08 A 6=-1.60498e-11 A 8= 2.09732e-15 Page 15 K = 0.00000e+00 A 4= 2.20969e-06 A 6=-1.35887e-09 A 8= 1.72077e-12 Page 23 K = 0.00000e+00 A 4=-1.06285e-06 A 6= 8.18942e-10 A 8=-8.94142e-13 Various data Zoom ratio 3.81 Wide-angle, Medium, Telephoto Focal length 19.98 64.65 76.21 F number 1.51 1.51 1.51 Half-angle 36.52 12.89 10.99 Image height 14.80 14.80 14.80 Lens length 288.48 288.48 288.48 BF 39.04 39.04 39.04 d14 0.77 50.53 53.86 d21 12.46 2.70 3.74 d22 24.71 12.44 5.74 d27 31.36 3.62 5.96 d41 39.04 39.04 39.04 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 74.43 88.56 65.32 31.72 2 15 -26.48 25.86 7.09 -11.58 3 22 ∞ 0.00 0.00 -0.00 4 23 86.45 11.91 3.30 -3.43 5 28 64.55 53.81 12.79 -24.51

[0087] [Numerical Example 7] Unit: mm Surface data Surface numbers r d nd vd 1* 157.888 2.00 1.75500 52.3 2 55.214 12.12 3 220.056 3.00 1.64000 60.1 4 85.457 8.99 5 4078.624 1.50 1.75500 52.3 6 159.354 19.28 7 -104.993 2.40 1.88300 40.8 8 862.126 7.06 1.85478 24.8 9 -209.269 4.47 10* 205.304 15.92 1.67790 55.3 11 -95.452 0.30 12 178.613 2.50 1.85478 24.8 13 69.022 16.27 1.59522 67.7 14 -292.462 0.20 15 109.579 5.69 1.76385 48.5 16 359.379 (variable) 17 76.969 1.50 1.76385 48.5 18 44.112 6.48 19 498.055 1.50 1.53775 74.7 20 41.900 6.19 1.84666 23.8 21 77.379 13.94 22 -57.307 1.50 1.88300 40.8 23 -117.001 (variable) 24 -104.405 2.36 1.89286 20.4 25 -64.062 1.50 1.80100 35.0 26 -4195.336 (variable) 27 (aperture) ∞ 0.99 28* 985.995 2.29 1.76385 48.5 29 -208.591 0.20 30 62.314 6.36 1.81600 46.6 31 224.377 1.50 1.78880 28.4 32 205.712 (variable) 33 4837.926 1.50 1.89286 20.4 34 48.011 8.96 1.43875 94.9 35 -159.422 0.19 36 133.793 3.95 1.90525 35.0 37 -404.878 1.41 38 60.868 9.50 1.89286 20.4 39 -83.058 1.30 1.79952 42.2 40 -219.302 2.86 41 678.811 1.30 1.85478 24.8 42 29.441 2.48 1.81600 46.6 43 35.137 2.54 44 59.589 17.58 1.81600 46.6 45 -26.816 1.30 1.85478 24.8 46 -246.393 (variable) Image plane ∞ Aspherical data Front page K = 0.00000e+00 A 4=-1.13479e-08 A 6= 5.91293e-11 A 8=-1.82294e-14 Side 10 K = 0.00000e+00 A 4=-1.53652e-08 A 6=-1.48228e-11 A 8= 3.25742e-15 Page 28 K = 0.00000e+00 A 4=-1.60045e-06 A 6= 1.01126e-10 A 8=-1.00364e-12 Various data Zoom ratio 2.50 Wide angle Middle Telephoto Focal length 18.01 37.98 44.94 F-number 1.51 1.51 1.51 Half angle of view 39.42 21.29 18.23 Image height 14.80 14.80 14.80 Overall lens length 312.34 312.34 312.34 BF 39.02 39.02 39.02 d16 0.93 53.44 62.75 d23 43.89 4.91 1.71 d26 1.24 4.17 1.51 d32 24.39 7.92 4.47 d46 39.02 39.02 39.02 Zoom lens group data Group Starting surface Focal length Lens construction length Front principal point position Rear principal point position 1 1 82.74 101.70 81.85 88.32 2 17 -53.00 31.11 14.35 -10.49 3 24 -144.75 3.86 -0.32 -2.40 4 27 72.19 11.33 1.12 -5.61 5 33 61.02 54.87 14.04 -20.45

[0088] 〔Numerical Example 8〕 Unit: mm Surface data Surface number r d nd vd 1 ∞ 3.00 1.88300 40.8 2 413.197 7.61 3 -211.004 4.42 1.68893 31.1 4 -145.120 28.08 5 -154.892 2.40 1.88300 40.8 6 181.392 4.59 1.85478 24.8 7 1051.246 2.00 8 330.874 7.78 1.67790 55.3 9 -164.618 0.30 10 262.362 2.50 1.85478 24.8 11 82.015 11.62 1.59522 67.7 12 -404.968 0.20 13* 82.445 8.36 1.76385 48.5 14 422.240 (variable) 15 1068.723 1.50 1.76385 48.5 16 48.745 9.04 17 -123.241 1.50 1.53775 74.7 18 59.100 5.72 1.84666 23.8 19 1682.235 4.53 20 -62.985 1.50 1.88300 40.8 21 -109.652 (variable) 22 -100.327 3.38 1.89286 20.4 23 -58.308 1.50 1.74951 35.3 24 4303.373 (variable) 25* 191.954 7.75 1.76385 48.5 26 -97.992 0.20 27 46.466 14.80 1.81600 46.6 28 -144.776 1.50 1.77047 29.7 29 42.434 (Variable) 30 (aperture) ∞ 1.00 31 111.188 1.50 1.85896 22.7 32 33.965 11.81 1.43875 94.9 33 -784.157 1.00 34 51.936 12.54 1.89286 20.4 35 -73.215 1.30 1.79952 42.2 36 -349.709 0.20 37 1022.342 3.28 1.90525 35.0 38 -184.507 1.06 39 -638.358 1.30 1.85478 24.8 40 24.172 6.04 1.81600 46.6 41 35.000 8.44 42 82.399 4.81 1.81600 46.6 43 -59.931 1.30 1.85478 24.8 44 -246.393 (variable) Image plane ∞ Aspherical data Page 13 K = 0.00000e+00 A 4= 5.80797e-09 A 6= 7.21418e-12 A 8=-2.10197e-15 Page 25 K = 0.00000e+00 A 4=-9.24863e-07 A 6= 2.49894e-11 A 8=-4.37381e-14 Various data Zoom ratio 2.50 Wide-angle, Medium, Telephoto Focal length 39.98 84.86 99.77 F number 1.55 1.55 1.55 Half-angle 20.31 9.89 8.44 Image height 14.80 14.80 14.80 Lens length 293.39 293.39 293.39 BF 39.78 39.78 39.78 d14 1.21 35.23 40.18 d21 32.06 4.22 1.77 d24 18.68 14.34 10.24 d29 10.33 8.50 10.09 d44 39.78 39.78 39.78 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 106.69 82.85 63.88 6.29 2 15 -45.89 23.79 5.04 -13.21 3 22 -151.98 4.88 -0.60 -3.25 4 25 62.48 24.25 -6.83 -17.47 5 30 89.42 55.57 17.74 -22.07

[0089] [Numerical Example 9] Unit: mm Surface data Face number rd nd vd 1 177.428 13.46 1.68893 31.1 2 -607.385 0.20 3 390.353 3.00 1.88300 40.8 4 104.715 35.48 5 -103.094 2.40 1.88300 40.8 6 419.876 2.79 1.85478 24.8 7 -3897.237 3.65 8* -308.671 5.51 1.67790 55.3 9 -98.830 0.30 10 839.329 2.50 1.84666 23.8 11 120.189 11.94 1.59522 67.7 12 -135.146 0.20 13 73.634 8.64 1.76385 48.5 14 202.032 (variable) 15 145.823 1.50 1.76385 48.5 16 84.357 3.04 17 1493.065 1.50 1.53775 74.7 18 36.445 7.41 1.84666 23.8 19 83.151 4.64 20 -104.226 1.50 1.88300 40.8 21 136.644 (variable) 22 (aperture) ∞ 3.00 23 -78.751 6.05 1.85896 22.7 24 -33.301 1.50 1.80100 35.0 25 259.047 (variable) 26* 120.837 7.76 1.76385 48.5 27 -85.257 0.20 28 61.675 13.60 1.81600 46.6 29 -66.644 1.50 1.78880 28.4 30 61.409 (variable) 31 -360.171 1.50 1.89286 20.4 32 49.690 8.95 1.58913 61.1 33 -148.032 0.20 34 105.776 3.92 2.00100 29.1 35 -2884.169 0.20 36 49.449 11.13 1.89286 20.4 37 -69.568 1.30 1.79952 42.2 38 -496.650 0.67 39 -332.794 1.30 1.85478 24.8 40 23.000 5.99 1.81600 46.6 41 37.403 2.70 42 77.045 5.14 1.81600 46.6 43 -103.101 1.30 1.85478 24.8 44 -246.393 (variable) Image plane ∞ Aspherical data Side 8 K = 0.00000e+00 A 4=-2.97439e-09 A 6= 1.11435e-11 A 8=-2.92131e-15 Page 26 K = 0.00000e+00 A 4=-1.21288e-06 A 6= 1.45795e-10 A 8=-1.32937e-15 Various data Zoom ratio 2.00 Wide-angle, Medium, Telephoto Focal length 45.02 76.37 90.06 F number 1.40 1.40 1.40 Half-angle 18.20 10.97 9.33 Image height 14.80 14.80 14.80 Lens length 291.48 291.48 291.48 BF 39.02 39.02 39.02 d14 12.90 45.80 54.02 d21 14.99 3.56 2.88 d25 8.25 4.74 2.08 d30 28.75 10.80 5.92 d44 39.02 39.02 39.02 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 135.15 90.08 77.78 10.04 2 15 -49.71 19.59 13.12 -1.16 3 22 -81.10 10.55 3.56 -3.49 4 26 53.48 23.06 -2.69 -14.07 5 31 58.75 44.29 7.89 -18.18

[0090] [Numerical Example 10] Unit: mm Surface data Face number rd nd vd 1 370.219 7.43 1.67270 32.1 2 -351.617 0.20 3 -2752.964 3.00 1.88300 40.8 4 138.132 27.57 5 -124.180 2.40 1.88300 40.8 6 255.902 3.69 1.85478 24.8 7 5612.952 2.00 8 2341.055 7.43 1.69680 55.5 9 -113.136 0.30 10 192.431 2.50 1.85478 24.8 11 82.406 11.77 1.52841 76.5 12 -278.023 2.25 13 78.431 8.73 1.76385 48.5 14 503.162 (variable) 15 329.785 1.50 1.76385 48.5 16 45.726 (Variable) 17 584.830 1.50 1.53775 74.7 18 36.902 5.31 1.85478 24.8 19 123.041 3.93 20 -80.319 1.50 1.88300 40.8 21 -367.127 (variable) 22 -78.580 3.57 1.89286 20.4 23 -42.440 1.50 1.80100 35.0 24 235.486 (variable) 25 (aperture) ∞ 2.57 26* 194.707 5.09 1.76385 48.5 27 -109.306 0.20 28 55.558 8.48 1.81600 46.6 29 -352.132 1.50 1.78880 28.4 30 73.356 (Variable) 31 -662.556 1.50 1.89286 20.4 32 53.238 8.93 1.43875 94.9 33 -115.345 0.20 34 128.222 6.50 1.90525 35.0 35 -248.127 0.20 36 51.842 10.18 1.89286 20.4 37 -83.149 1.30 1.79952 42.2 38 -754.752 2.01 39 -742.792 1.30 1.85478 24.8 40 23.000 8.74 1.81600 46.6 41 37.094 3.06 42 78.512 7.08 1.81600 46.6 43 -54.162 1.30 1.85478 24.8 44 -246.393 (variable) Image plane ∞ Aspherical data Page 26 K = 0.00000e+00 A 4=-1.11099e-06 A 6= 1.09595e-10 A 8=-1.76343e-13 Various data Zoom ratio 2.88 Wide-angle, Medium, Telephoto Focal length 31.20 70.00 89.84 F number 1.51 1.51 1.51 Half-angle 25.38 11.94 9.35 Image height 14.80 14.80 14.80 Lens length 284.56 284.56 284.56 BF 39.00 39.00 39.00 d14 1.00 42.73 51.78 d16 8.16 4.76 5.13 d21 18.77 3.26 4.08 d24 12.61 6.72 1.49 d30 36.80 19.86 14.85 d44 39.00 39.00 39.00 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 105.94 79.27 64.72 14.10 2 15 -69.32 1.50 0.99 0.14 3 17 -184.70 12.24 15.40 6.21 4 22 -78.80 5.07 0.39 -2.30 5 25 61.24 17.84 1.17 -9.39 6 31 61.08 52.30 9.50 -21.87

[0091] [Table 1] [Explanation of Symbols]

[0092] U1 First Lens Group U2 Second Lens Group U3 Third Lens Group U4 4th lens group U5 5th lens group U6 6th lens group SP aperture I image plane

Claims

1. A zoom lens having, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, two to four movable lens groups that move during zooming, and a subsequent lens group with positive refractive power that does not move for zooming, wherein the spacing between adjacent lens groups changes during zooming. The aforementioned successor lens group consists of a first sub-lens group and a second sub-lens group, arranged in order from the object side to the image side, and the second sub-lens group consists of the combination of lens components in the aforementioned successor lens group, excluding the lens component closest to the object, that has the greatest positive refractive power. When the sum of the thicknesses of the lens components in the first sub-lens group along the optical axis is dFRG, the distance along the optical axis from the object-side surface of the first sub-lens group to the object-side surface of the second sub-lens group is dFR, the focal length of the first sub-lens group is fFR, and the focal length of the subsequent lens group is fR, 0.89<dFRG / dFR<1 fR / fFR<0.7 A zoom lens characterized by satisfying the following condition.

2. When the focal length of the lens component closest to the object in the first sub-lens group is denoted as fFRF, fR / fFRF<0.7 The zoom lens according to claim 1, characterized in that it satisfies the following condition.

3. When dpp is the distance along the optical axis from the object-side surface of the successor lens group to the image-side principal point of the successor lens group, and dRI is the distance along the optical axis from the object-side surface of the successor lens group to the image plane, 0.2<dpp / dRI<1 A zoom lens according to claim 1 or 2, characterized in that it satisfies the following condition.

4. The zoom lens according to any one of claims 1 to 3, characterized in that the two to four movable lens groups consist of three lens groups.

5. The zoom lens according to any one of claims 1 to 3, characterized in that the two to four movable lens groups consist of four lens groups.

6. A zoom lens according to any one of claims 1 to 5, comprising an aperture, wherein the aperture moves along the optical axis during zooming.

7. The zoom lens according to any one of claims 1 to 6, characterized in that the lens component closest to the object in the first sub-lens group is a cemented lens.

8. When Ndave is the average refractive index of all lens components in the first sub-lens group with respect to the d line, 1.60<Ndave A zoom lens according to any one of items 1 to 7, characterized in that it satisfies the following condition.

9. Let dn be the thickness of each lens in the first sub-lens group along the optical axis, and Nd be the refractive index of each lens in the first sub-lens group with respect to the d line. When dFRGN is the sum of the products of dn and Nd in the first sub-lens group, 1.0<dFRGN / dFR A zoom lens according to any one of items 1 to 8, characterized in that it satisfies the following condition.

10. An imaging device characterized by having a zoom lens according to any one of claims 1 to 9, and an image sensor for capturing an image formed by the zoom lens.

Images