Zoom lens and imaging device

Abstract

To provide a zoom lens which is well corrected for aberrations while reducing a weight of a lens group configured to move while zooming.SOLUTION: A zoom lens comprises: a first negative lens group arranged on the most object side, and having a first negative meniscus lens turning its convex surface to an object side and a second negative meniscus lens turning its convex surface to an object side, in order from the object side to an image plane side; and multiple lens groups arranged closer to the image plane side than the first negative meniscus lens, and including a positive lens group having an aperture diaphragm, and a second negative lens group arranged closer to on the image plane side than the positive lens group. The zoom lens is configured such that, while zooming, the first negative lens group is stationary and distances between adjacent lens groups of the multiple lens groups change, and satisfies predetermined conditional expressions.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a zoom lens and an imaging device. [Background technology]

[0002] As a wide-angle zoom lens, a retrofocus zoom lens in which a lens group with negative refractive power is arranged closest to the object side has been developed (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-34946 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-89365 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, with the increasing need for video shooting, there has been a demand for a compact, wide-angle zoom lens that can perform good aberration correction while achieving weight reduction in the lens group that moves during zooming.

[0005] It is desirable to provide a compact, wide-angle zoom lens and an imaging device that can perform good aberration correction while achieving weight reduction in the lens group that moves during zooming. [Means for solving the problem]

[0006] A zoom lens according to an embodiment of the present disclosure includes a plurality of lens groups including, in order from the object side to the image side, a first negative lens group arranged closest to the object, the first negative lens group having a first negative meniscus lens with a convex surface facing the object side and a second negative meniscus lens with a convex surface facing the object side; a positive lens group arranged closer to the image side than the first negative lens group and having an aperture stop; and a second negative lens group arranged closer to the image side than the positive lens group; the zoom lens is configured such that during zooming, the first negative lens group remains stationary and the spacing between adjacent lens groups in the plurality of lens groups changes; the first negative lens group has three negative lenses including the first negative meniscus lens and the second negative meniscus lens; and when focusing from an object distance of infinity to a close distance, the lens group among the plurality of lens groups arranged closer to the image side than the positive lens group moves as a focus lens group, and the following conditional expression is satisfied: 0.9 <|fGR1 / fw|< 1.8 ……( 1A ) 0.7<|BFw / fw|<2.4 ……(2) 1.7<(R1f+R1r) / (R1f-R1r)<4.5 ……(3A) 1.3<(fG2) / (fGR1)<3.5 ……(4A) however, fGR1: focal length of the first negative lens group fw: focal length of the entire system at the wide-angle end BFw: Back focus at the wide-angle end (the distance from the lens surface closest to the image plane among multiple lens groups to the image plane) R1f: radius of curvature of the object-side surface of the first negative meniscus lens R1r: radius of curvature of the image-side surface of the first negative meniscus lens fG2: focal length of the second negative meniscus lens Let's say.

[0007] An imaging device according to one embodiment of the present disclosure includes a zoom lens and an imaging element that outputs an imaging signal corresponding to an optical image formed by the zoom lens, and the zoom lens is configured by the zoom lens according to the embodiment of the present disclosure.

[0008] In a zoom lens or an imaging device according to an embodiment of the present disclosure, the configuration of each lens group is optimized so that the weight of the lens groups that move during zooming can be reduced while still allowing for good aberration correction. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a lens cross-sectional view showing a first configuration example (Example 1) of a zoom lens according to an embodiment of the present disclosure. [Figure 2] 4 is an aberration diagram showing longitudinal aberration at the wide-angle end of the zoom lens according to Example 1 when focused on infinity. FIG. [Figure 3] 4 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 when the zoom lens is positioned at an intermediate point and focused on infinity. FIG. [Figure 4] 4 is an aberration diagram showing longitudinal aberration at the telephoto end of the zoom lens according to Example 1 when focused on infinity. FIG. [Figure 5] 4 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the wide-angle end when focusing on a close distance. FIG. [Figure 6] 4 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at an intermediate position and when focusing on a close distance. FIG. [Figure 7] 4 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 1 at the telephoto end when focusing on a close object. FIG. [Figure 8] 4 is an aberration diagram showing lateral aberration at the wide-angle end of the zoom lens according to Example 1 when focused on infinity. FIG. [Figure 9] 4 is an aberration diagram showing lateral aberration when the zoom lens according to Example 1 is positioned at an intermediate point and focused on infinity. FIG. [Figure 10] 4 is an aberration diagram showing lateral aberration at the telephoto end of the zoom lens according to Example 1 when focused on infinity. FIG. [Figure 11] 4 is an aberration diagram showing lateral aberration at the wide-angle end of the zoom lens according to Example 1 when focusing on a close distance. FIG. [Figure 12]4 is an aberration diagram showing lateral aberration when the zoom lens according to Example 1 is positioned at an intermediate position and focused on a close distance. FIG. [Figure 13] 4 is an aberration diagram showing lateral aberration at the telephoto end of the zoom lens according to Example 1 when focusing on a close distance. FIG. [Figure 14] FIG. 2 is a lens cross-sectional view showing a second configuration example (Example 2) of a zoom lens according to an embodiment. [Figure 15] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the wide-angle end and when focused on infinity. FIG. [Figure 16] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 17] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the telephoto end when focused on infinity. FIG. [Figure 18] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the wide-angle end when focusing on a close distance. FIG. [Figure 19] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 20] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 2 at the telephoto end when focusing on a close object. FIG. [Figure 21] 10A and 10B are aberration diagrams illustrating lateral aberrations at the wide-angle end of the zoom lens according to Example 2 when focused on infinity. [Figure 22] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 2 when the zoom lens is positioned at an intermediate point and focused on infinity. [Figure 23] 10 is an aberration diagram showing lateral aberration at the telephoto end of the zoom lens according to Example 2 when focused on infinity. FIG. [Figure 24] 10 is an aberration diagram showing lateral aberration at the wide-angle end of the zoom lens according to Example 2 when focusing on a close distance. FIG. [Figure 25] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 2 when the zoom lens is positioned at an intermediate position and focused on a close distance. [Figure 26] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 2 at the telephoto end when focusing on a close distance. FIG. [Figure 27] FIG. 10 is a lens cross-sectional view showing a third configuration example (Example 3) of a zoom lens according to an embodiment. [Figure 28] 10A and 10B are aberration diagrams illustrating longitudinal aberrations at the wide-angle end of the zoom lens according to Example 3 when focused on infinity. [Figure 29] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 30] 10A and 10B are aberration diagrams illustrating longitudinal aberrations of the zoom lens according to Example 3 at the telephoto end when focused on infinity. [Figure 31] 10 is an aberration diagram showing longitudinal aberration at the wide-angle end of the zoom lens according to Example 3 when focusing on a close distance. FIG. [Figure 32] 10A and 10B are aberration diagrams illustrating longitudinal aberrations of the zoom lens according to Example 3 when the zoom lens is positioned at an intermediate position and focused on a close distance. [Figure 33] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 3 at the telephoto end when focusing on a close object. FIG. [Figure 34] 10A and 10B are aberration diagrams illustrating lateral aberrations at the wide-angle end of the zoom lens according to Example 3 when focused on infinity. [Figure 35] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 3 when the zoom lens is positioned at an intermediate point and focused on infinity. [Figure 36] 10A and 10B are aberration diagrams illustrating lateral aberrations at the telephoto end of the zoom lens according to Example 3 when focused on infinity. [Figure 37] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 3 at the wide-angle end when focusing on a close distance. [Figure 38] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 3 when the zoom lens is positioned at an intermediate position and focused on a close distance. [Figure 39] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 3 at the telephoto end when focusing on a close distance. [Figure 40] FIG. 10 is a lens cross-sectional view showing a fourth configuration example (Example 4) of a zoom lens according to an embodiment. [Figure 41]10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the wide-angle end and when focused on infinity. FIG. [Figure 42] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 43] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the telephoto end when focused on infinity. FIG. [Figure 44] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the wide-angle end when focusing on a close distance. FIG. [Figure 45] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 46] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 4 at the telephoto end when focusing on a close object. FIG. [Figure 47] 10A and 10B are aberration diagrams illustrating lateral aberrations at the wide-angle end of the zoom lens according to Example 4 when focused on infinity. [Figure 48] 10A and 10B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 4 when the zoom lens is positioned at an intermediate point and focused on infinity. [Figure 49] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 4 at the telephoto end when focused on infinity. FIG. [Figure 50] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 4 at the wide-angle end when focusing on a close distance. FIG. [Figure 51] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 4 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 52] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 4 at the telephoto end when focusing on a close object. FIG. [Figure 53] FIG. 10 is a lens cross-sectional view showing a fifth configuration example (Example 5) of a zoom lens according to an embodiment. [Figure 54] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the wide-angle end when focused on infinity. FIG. [Figure 55] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 56] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the telephoto end when focused on infinity. FIG. [Figure 57] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the wide-angle end when focusing on a close distance. FIG. [Figure 58] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 59] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 5 at the telephoto end when focusing on a close object. FIG. [Figure 60] 10 is an aberration diagram showing lateral aberration at the wide-angle end of the zoom lens according to Example 5 when focused on infinity. FIG. [Figure 61] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 5 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 62] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 5 at the telephoto end when focused on infinity. FIG. [Figure 63] 10 is an aberration diagram showing lateral aberration at the wide-angle end of the zoom lens according to Example 5 when focusing on a close distance. FIG. [Figure 64] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 5 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 65] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 5 at the telephoto end when focusing on a close distance. FIG. [Figure 66] FIG. 10 is a lens cross-sectional view showing a sixth configuration example (Example 6) of a zoom lens according to an embodiment. [Figure 67] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the wide-angle end when focused on infinity. FIG. [Figure 68] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 69] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the telephoto end when focused on infinity. FIG. [Figure 70]13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the wide-angle end when focusing on a close distance. FIG. [Figure 71] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 72] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 6 at the telephoto end when focusing on a close object. FIG. [Figure 73] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 6 at the wide-angle end when focused on infinity. FIG. [Figure 74] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 6 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 75] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 6 at the telephoto end when focused on infinity. FIG. [Figure 76] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 6 at the wide-angle end when focusing on a close distance. FIG. [Figure 77] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 6 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 78] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 6 at the telephoto end when focusing on a close object. FIG. [Figure 79] FIG. 10 is a lens cross-sectional view showing a seventh configuration example (Example 7) of a zoom lens according to an embodiment. [Figure 80] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 7 at the wide-angle end and when focused on infinity. FIG. [Figure 81] FIG. 11 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 7 when it is positioned at an intermediate point and focused on infinity. [Figure 82] 10 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 7 at the telephoto end when focused on infinity. FIG. [Figure 83] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 7 at the wide-angle end when focusing on a close distance. FIG. [Figure 84] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 7 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 85] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 7 at the telephoto end when focusing on a close object. FIG. [Figure 86] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 7 at the wide-angle end and when focused on infinity. FIG. [Figure 87] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 7 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 88] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 7 at the telephoto end when focused on infinity. FIG. [Figure 89] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 7 at the wide-angle end when focusing on a close distance. FIG. [Figure 90] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 7 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 91] 10 is an aberration diagram showing lateral aberration of the zoom lens according to Example 7 at the telephoto end when focusing on a close distance. FIG. [Figure 92] FIG. 10 is a lens cross-sectional view showing an eighth configuration example (Example 8) of a zoom lens according to an embodiment. [Figure 93] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 8 at the wide-angle end and when focused on infinity. FIG. [Figure 94] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 8 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 95] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 8 at the telephoto end when focused on infinity. FIG. [Figure 96] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 8 at the wide-angle end when focusing on a close distance. FIG. [Figure 97] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 8 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 98] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 8 at the telephoto end when focusing on a close object. FIG. [Figure 99]13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 8 at the wide-angle end and when focused on infinity. FIG. [Figure 100] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 8 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 101] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 8 at the telephoto end when focused on infinity. FIG. [Figure 102] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 8 at the wide-angle end when focusing on a close distance. FIG. [Figure 103] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 8 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 104] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 8 at the telephoto end when focusing on a close distance. FIG. [Figure 105] FIG. 13 is a lens cross-sectional view showing a ninth configuration example (Example 9) of a zoom lens according to an embodiment. [Figure 106] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 9 at the wide-angle end and when focused on infinity. FIG. [Figure 107] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 9 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 108] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 9 at the telephoto end when focused on infinity. FIG. [Figure 109] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 9 at the wide-angle end when focusing on a close distance. FIG. [Figure 110] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 9 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 111] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 9 at the telephoto end when focusing on a close object. FIG. [Figure 112] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 9 at the wide-angle end when focused on infinity. FIG. [Figure 113] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 9 when it is positioned at an intermediate point and focused on infinity. FIG. [Figure 114] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 9 at the telephoto end when focused on infinity. FIG. [Figure 115] 13 is an aberration diagram showing lateral aberration at the wide-angle end of the zoom lens according to Example 9 when focusing on a close distance. FIG. [Figure 116] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 9 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 117] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 9 at the telephoto end when focusing on a close distance. FIG. [Figure 118] FIG. 16 is a lens cross-sectional view showing a tenth configuration example (Example 10) of a zoom lens according to an embodiment. [Figure 119] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 10 at the wide-angle end and when focused on infinity. FIG. [Figure 120] 13A and 13B are aberration diagrams showing longitudinal aberrations of the zoom lens according to Example 10 when the zoom lens is positioned at an intermediate point and focused on infinity. [Figure 121] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 10 at the telephoto end when focused on infinity. FIG. [Figure 122] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 10 at the wide-angle end when focusing on a close distance. FIG. [Figure 123] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 10 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 124] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 10 at the telephoto end when focusing on a close object. FIG. [Figure 125] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 10 at the wide-angle end and when focused on infinity. FIG. [Figure 126] 13A and 13B are aberration diagrams showing lateral aberrations of the zoom lens according to Example 10 when the zoom lens is positioned at an intermediate point and focused on infinity. [Figure 127] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 10 at the telephoto end when focused on infinity. FIG. [Figure 128]13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 10 at the wide-angle end when focusing on a close distance. FIG. [Figure 129] 13A and 13B are aberration diagrams showing lateral aberrations of the zoom lens according to Example 10 when the zoom lens is positioned at an intermediate position and focused on a close distance. [Figure 130] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 10 at the telephoto end when focusing on a close object. FIG. [Figure 131] FIG. 12 is a lens cross-sectional view showing an eleventh configuration example (Example 11) of the zoom lens according to an embodiment. [Figure 132] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 11 at the wide-angle end when focused on infinity. FIG. [Figure 133] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 11 when the zoom lens is positioned at an intermediate point and focused on infinity. FIG. [Figure 134] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 11 at the telephoto end when focused on infinity. FIG. [Figure 135] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 11 at the wide-angle end when focusing on a close object. FIG. [Figure 136] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 11 at an intermediate position and when focusing on a close distance. FIG. [Figure 137] 13 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 11 at the telephoto end when focusing on a close object. FIG. [Figure 138] 13A and 13B are aberration diagrams showing lateral aberrations of the zoom lens according to Example 11 at the wide-angle end and when focused on infinity. [Figure 139] 13A and 13B are aberration diagrams showing lateral aberrations of the zoom lens according to Example 11 when the zoom lens is positioned at an intermediate point and focused on infinity. [Figure 140] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 11 at the telephoto end when focused on infinity. FIG. [Figure 141] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 11 at the wide-angle end when focusing on a close distance. FIG. [Figure 142]13A and 13B are aberration diagrams showing lateral aberrations of the zoom lens according to Example 11 when the zoom lens is positioned at an intermediate position and focused on a close distance. [Figure 143] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 11 at the telephoto end when focusing on a close object. FIG. [Figure 144] FIG. 12 is a lens cross-sectional view showing a twelfth configuration example (Example 12) of the zoom lens according to an embodiment. [Figure 145] 16 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 12 at the wide-angle end and when focused on infinity. FIG. [Figure 146] FIG. 20 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 12 when it is positioned at an intermediate point and focused on infinity. [Figure 147] FIG. 20 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 12 at the telephoto end when focused on infinity. [Figure 148] 16 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 12 at the wide-angle end when focusing on a close object. FIG. [Figure 149] 16A and 16B are aberration diagrams showing longitudinal aberrations of the zoom lens according to Example 12 when the zoom lens is positioned at an intermediate position and focused on a close distance. [Figure 150] 16 is an aberration diagram showing longitudinal aberration of the zoom lens according to Example 12 at the telephoto end when focusing on a close object. FIG. [Figure 151] 16A and 16B are aberration diagrams illustrating lateral aberrations of the zoom lens according to Example 12 at the wide-angle end and when focused on infinity. [Figure 152] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 12 when the zoom lens is positioned at an intermediate point and focused on infinity. FIG. [Figure 153] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 12 at the telephoto end when focused on infinity. FIG. [Fig. 154] 16A and 16B are aberration diagrams showing lateral aberrations of the zoom lens according to Example 12 at the wide-angle end when focusing on a close distance. [Figure 155] 13 is an aberration diagram showing lateral aberration of the zoom lens according to Example 12 when it is positioned at an intermediate position and focused on a close distance. FIG. [Figure 156]16 is an aberration diagram showing lateral aberration of the zoom lens according to Example 12 at the telephoto end when focusing on a close object. FIG. [Figure 157] FIG. 1 is a block diagram illustrating an example of the configuration of an imaging device. [Figure 158] 1 is a block diagram showing an example of a schematic configuration of a vehicle control system; [Figure 159] FIG. 2 is an explanatory diagram showing an example of the installation positions of an outside-vehicle information detection unit and an imaging unit. [Figure 160] FIG. 1 is a diagram illustrating an example of a schematic configuration of an endoscope system. [Figure 161] A block diagram showing an example of the functional configuration of the camera and CCU shown in Figure 160. [Figure 162] FIG. 1 is a diagram illustrating an example of a schematic configuration of a microsurgery system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order. 0. Comparative Example 1. Basic lens structure 2. Action and Effects 3. Application example to imaging devices 4. Numerical examples of lenses 5. Application Examples 6. Other embodiments

[0011] <0. Comparative Examples> In recent years, in order to achieve both compactness and high resolution, so-called mirrorless wide-angle zoom lenses have been proposed, which have a short back focus and no mechanical components between the final lens surface and the image plane (see, for example, Patent Document 1 (JP 2020-34946 A)). The zoom lens proposed in Patent Document 1 is a so-called retrofocus zoom lens consisting of a first group with negative refractive power and a rear group with positive refractive power, and achieves compactness by adopting a power configuration that is optimal for a mirrorless type with a short back focus.

[0012] Furthermore, with the growing need for video shooting in recent years, there has been a demand for imaging optical systems that are compatible with so-called power zooms, in which the lens groups that move during zooming are electrically driven by a motor or the like. In power zooms, the lens groups that move during zooming are driven by a motor, so it is essential that the lens groups that move during zooming be lightweight. However, many retrofocus imaging optical systems are configured so that a large-aperture first lens group moves during zooming. The zoom lens proposed in Patent Document 1 is a compact, high-resolution zoom lens, but is not suitable for power zooms because the large-aperture first lens group moves during zooming.

[0013] On the other hand, for example, Patent Document 2 (JP 2014-89365 A) proposes a configuration in which the first lens group in a retrofocus optical system is fixed during zooming. The zoom lens proposed in Patent Document 2 has a fixed first lens group and high resolution, but it does not have a compact and high resolution configuration compatible with mirrorless types with short back focal lengths.

[0014] Therefore, it is desirable to develop a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens groups that move during zooming.

[0015] <1. Basic lens configuration> FIG. 1 shows a first example configuration of a zoom lens according to an embodiment of the present disclosure, which corresponds to the configuration of Example 1 described below. FIG. 14 shows a second example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 2 described below. FIG. 27 shows a third example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 3 described below. FIG. 40 shows a fourth example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 4 described below. FIG. 53 shows a fifth example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 5 described below. FIG. 66 shows a sixth example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 6 described below. FIG. 79 shows a seventh example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 7 described below. FIG. 92 shows an eighth example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 8 described below. FIG. 105 shows a ninth example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 9 described below. FIG. 118 shows a tenth example configuration of a zoom lens according to an embodiment, which corresponds to the configuration of Example 10 described below. Fig. 131 shows an eleventh configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 11 described later. Fig. 144 shows a twelfth configuration example of a zoom lens according to an embodiment, which corresponds to the configuration of Example 12 described later.

[0016] 1 and other figures, Z1 indicates the optical axis. An optical member such as a cover glass for protecting the image sensor may be disposed between the zoom lenses 1 to 12 according to the first to twelfth configuration examples and the image plane IMG. In addition to the cover glass, various optical filters such as a low-pass filter and an infrared cut filter may also be disposed as optical members.

[0017] Below, the configuration of a zoom lens according to one embodiment of the present disclosure will be described in association with zoom lenses 1 to 12 according to the respective configuration examples shown in FIG. 1 etc., as appropriate, but the technology according to the present disclosure is not limited to the configuration examples shown in the drawings.

[0018] A zoom lens according to one embodiment includes a plurality of lens groups. The plurality of lens groups includes, in order from the object side to the image side, a first negative lens group arranged closest to the object side and having a first negative meniscus lens with a convex surface facing the object side and a second negative meniscus lens with a convex surface facing the object side. The plurality of lens groups also includes a positive lens group GRs arranged closer to the image side than the first negative lens group and having an aperture stop St, and a second negative lens group arranged closer to the image side than the positive lens group GRs.

[0019] Here, in the zoom lens according to one embodiment, the term "lens group" refers to a group that has refractive power and whose spacing between adjacent lens groups changes during zooming. A group that is composed solely of flat plates and has no refractive power is not defined as a lens group.

[0020] In the examples described below, the zoom lenses according to Examples 1 to 7 and 10 to 12 are configured to include a first lens group GR1 to a fifth lens group GR5 as the plurality of lens groups, and the zoom lenses according to Examples 8 and 9 are configured to include a first lens group GR1 to a fourth lens group GR4 as the plurality of lens groups.

[0021] In the zoom lenses according to Examples 1 to 12 described below, the first lens group GR1 corresponds to the first negative lens group described above, the lens L11 corresponds to the first negative meniscus lens, and the lens L12 corresponds to the second negative meniscus lens.

[0022] In the examples described below, in the zoom lenses according to Examples 1 to 5 and 8 to 12, the second lens group GR2 corresponds to the positive lens group GRs, and in the zoom lenses according to Examples 6 and 7, the third lens group GR3 corresponds to the positive lens group GRs.

[0023] In the examples described below, in the zoom lenses according to Examples 1 to 5, 10, and 11, the fourth lens group GR4 corresponds to the second negative lens group described above, in the zoom lenses according to Examples 8, 9, and 12, the third lens group GR3 corresponds to the second negative lens group described above, and in the zoom lenses according to Examples 6 and 7, the fifth lens group GR5 corresponds to the second negative lens group described above.

[0024] In a zoom lens according to an embodiment, the first negative lens group is stationary during zooming, and the spacing between adjacent lens groups in the plurality of lens groups is variable. do In Figure 1 etc., the upper row shows the lens arrangement when the lens is at the wide-angle end (Wide) and focused at infinity, the middle row shows the lens arrangement when the lens is at the intermediate position (Mid) and focused at infinity, and the lower row shows the lens arrangement when the lens is at the telephoto end (Tele) and focused at infinity.

[0025] In addition, in a zoom lens according to an embodiment, when focusing from infinity to a close object distance, among the plurality of lens groups, a lens group arranged closer to the image plane than the positive lens group GRs moves as a focus lens group. In the examples described below, the third lens group GR3 moves as a focus lens group in the zoom lenses according to Examples 1 to 5, 8 to 10, and 12, and the fourth lens group GR4 moves as a focus lens group in the zoom lenses according to Examples 6, 7, and 11. In Figure 1 and other figures, the arrows indicate the direction in which the focus lens group moves when focusing from infinity to a close object distance.

[0026] In addition, the zoom lens according to an embodiment may further satisfy certain conditional expressions, etc., which will be described later.

[0027] <2. Actions and Effects> Next, the operation and effects of the zoom lens according to the embodiment of the present disclosure will be described, along with a more preferable configuration of the zoom lens according to the embodiment of the present disclosure, and the operation and effects thereof. The effects described in this specification are merely examples and are not limiting, and other effects may also be present.

[0028] In a zoom lens according to one embodiment, the configuration of each lens group is optimized to enable good aberration correction while reducing the weight of the lens groups that move during zooming, thereby making it possible to provide a compact, wide-angle zoom lens that can provide good aberration correction while reducing the weight of the lens groups that move during zooming, and an imaging device equipped with such a zoom lens.

[0029] In a zoom lens according to one embodiment, a first negative lens group is disposed closest to the object, a positive lens group GRs is disposed on the image plane side of the first negative lens group that moves together with the aperture stop St in the optical axis direction during zooming, and a second negative lens group is disposed on the image plane side of the positive lens group GRs, thereby realizing a compact, wide-angle zoom lens. In addition, by fixing the first lens group GR1 (first negative lens group) closest to the object, which tends to be large in the configuration of a retrofocus zoom lens, during zooming, the weight of the movable group during zooming is reduced.

[0030] A zoom lens according to an embodiment may satisfy the following conditional expression (1). 0.7<|fGR1 / fw|<2.2 ……(1) however, fGR1: focal length of the first negative lens group fw: focal length of the entire system at the wide-angle end Let's say.

[0031] Conditional formula (1) was established to achieve a compact optical system with high performance, and is a conditional formula for appropriately setting the focal length of the first negative lens group relative to the focal length of the entire system at the wide-angle end. If the lower limit of conditional formula (1) is exceeded, the axial light beam strongly diverged by the first negative lens group is incident on the second lens group GR2, making it difficult to correct spherical aberration and coma. This also leads to an increase in the aperture diameter of the aperture stop St, making it difficult to achieve a compact optical system as a whole. On the other hand, if the upper limit of conditional formula (1) is exceeded, the negative refractive power of the first negative lens group becomes too small, making it difficult to reduce the effective diameter of the lens closest to the object and achieve a wide angle.

[0032] It should be noted that a better effect can be obtained by setting the numerical range of conditional formula (1) to the following conditional formula (1A) and further to the following conditional formula (1B). 0.9<|fGR1 / fw|<1.8 ……(1A) 0.9<|fGR1 / fw|<1.6 ……(1B)

[0033] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (2). 0.7<|BFw / fw|<2.4 ……(2) however, fw: focal length of the entire system at the wide-angle end BFw: Back focus at the wide-angle end (the distance from the lens surface closest to the image plane among multiple lens groups to the image plane) Let's say.

[0034] Conditional formula (2) is defined to ensure that the size and weight of the optical system are small and lightweight, and is a conditional formula for appropriately setting the relationship between the focal length at the wide-angle end and the back focus at the wide-angle end. If the lower limit of conditional formula (2) is not met, the focal length at the wide-angle end becomes long, making it difficult to achieve a wide angle. On the other hand, if the upper limit of conditional formula (2) is exceeded, the back focus becomes too long, which increases the asymmetry in the power distribution required for widening the angle, making it difficult to correct various aberrations and achieve high image quality.

[0035] Furthermore, by setting the numerical range of conditional formula (2) to the following conditional formula (2A) and further to the following conditional formula (2B), a better effect can be obtained. 0.9<|BFw / fw|<2.2 ……(2A) 0.9<|BFw / fw|<1.8……(2B)

[0036] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (3): 1.4<(R1f+R1r) / (R1f-R1r)<5.2 ……(3) however, R1f: radius of curvature of the object-side surface of the first negative meniscus lens R1r: radius of curvature of the image-side surface of the first negative meniscus lens Let's say.

[0037] Conditional expression (3) is stipulated to suppress off-axis aberrations and reduce the effective diameter of the first negative meniscus lens. Conditional expression (3) is a conditional expression for appropriately setting the relationship between the radius of curvature of the object-side surface of the first negative meniscus lens, which is the lens closest to the object, and the radius of curvature of the image-plane-side surface. If the lower limit of conditional expression (3) is not met, the shape of the object-side surface of the first negative meniscus lens approaches a flat surface, making it difficult to correct off-axis aberrations. On the other hand, if the upper limit of conditional expression (3) is exceeded, the meniscus shape of the first negative meniscus lens becomes too strong, making it difficult to fabricate the first negative meniscus lens and also making it difficult to achieve a wide angle because the negative refractive power is weakened.

[0038] It should be noted that a better effect can be obtained by setting the numerical range of conditional expression (3) to the following conditional expression (3A) and further to the following conditional expression (3B). 1.7<(R1f+R1r) / (R1f-R1r)<4.5 ……(3A) 1.7<(R1f+R1r) / (R1f-R1r)<4.0 ……(3B)

[0039] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (4): 1.3<(fG2) / (fGR1)<4.1 ……(4) however, fGR1: focal length of the first negative lens group fG2: focal length of the second negative meniscus lens Let's say.

[0040] Conditional expression (4) is stipulated to achieve a wider angle and a smaller effective diameter of the first negative meniscus lens, which is the lens closest to the object. Conditional expression (4) is a conditional expression for appropriately setting the ratio between the focal length of the second negative meniscus lens and the focal length of the first negative lens group. If the lower limit of conditional expression (4) is not met, the negative refractive power of the second negative meniscus lens will bear most of the negative refractive power of the first negative lens group, resulting in a larger effective diameter of the first negative meniscus lens. On the other hand, if the upper limit of conditional expression (4) is exceeded, the negative refractive power of the second negative meniscus lens will be weak, making it difficult to achieve a wider angle.

[0041] It should be noted that a better effect can be obtained by setting the numerical range of conditional expression (4) to the following conditional expression (4A) and further to the following conditional expression (4B). 1.3<(fG2) / (fGR1)<3.5 ……(4A) 1.5<(fG2) / (fGR1)<3.5 ……(4B)

[0042] In a zoom lens according to an embodiment, the first negative lens group may be configured to have three negative lenses, including a first negative meniscus lens and a second negative meniscus lens. If a wide angle is achieved with a configuration of two or fewer negative lenses, the negative refractive power of each negative lens becomes too strong, making it difficult to correct off-axis aberrations such as curvature of field and chromatic aberration of magnification.

[0043] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (5): 1.2<β2n<4.2 ……(5) however, β2n: Lateral magnification of the second negative lens group at the telephoto end Let's say.

[0044] Conditional expression (5) is established to suppress off-axis aberrations and achieve compactness, and it stipulates the lateral magnification of the second negative lens group at the telephoto end. If the lower limit of conditional expression (5) is exceeded, not only will it be difficult to correct off-axis aberrations generated by the first negative lens group, which has strong negative refractive power, but the exit pupil distance will also be long, resulting in a large lens diameter near the image plane. On the other hand, if the upper limit of conditional expression (5) is exceeded, the off-axis aberrations generated by the first negative lens group will be over-corrected, making it difficult to maintain high image quality.

[0045] It should be noted that a better effect can be obtained by setting the numerical range of conditional expression (5) to the following conditional expression (5A) and further to the following conditional expression (5B). 1.5<β2n<3.6 ……(5A) 1.7<β2n<3.0 ……(5B)

[0046] Furthermore, in a zoom lens according to an embodiment, when focusing from infinity to a close distance, a lens group arranged closer to the image plane than the positive lens group GRs may be configured to move as a focus lens group. In recent years, in fields such as video photography, there has been a strong demand for reducing fluctuations in the angle of view during focusing. To achieve this, it is preferable to arrange the focus lens group closer to the image plane, and in a zoom lens according to an embodiment, it is preferable to arrange the focus lens group closer to the image plane than the positive lens group GRs having the aperture stop St.

[0047] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (6): 0.3<|fa / fb|<1.1 ……(6) however, fa: composite focal length at the wide-angle end of the lens group that is closer to the object than the positive lens group GRs among the multiple lens groups fb: composite focal length at the wide-angle end from the positive lens group GRs to the lens group closest to the image plane among the multiple lens groups Let's say.

[0048] Conditional expression (6) is defined to suppress aberrations and ensure sufficient back focus. It represents the ratio of the focal lengths of the two portions at the wide-angle end when the entire retrofocus optical system is roughly divided into a portion with negative refractive power on the object side and a portion with positive refractive power on the image side. If the lower limit of conditional expression (6) is exceeded, the negative refractive power on the object side becomes too strong, causing a strongly divergent light beam from the portion with negative refractive power on the object side to enter the portion with positive refractive power on the image side, making it difficult to correct spherical aberration and coma. This also leads to an increase in the diameter of the aperture stop St, making it difficult to miniaturize the entire optical system. On the other hand, if the upper limit of conditional expression (6) is exceeded, the negative refractive power on the object side becomes too weak, making it difficult to ensure sufficient back focus.

[0049] It should be noted that a better effect can be obtained by setting the numerical range of conditional expression (6) to the following conditional expression (6A) and further to the following conditional expression (6B). 0.35<|fa / fb|<0.95 ……(6A) 0.35<|fa / fb|<0.82 ……(6B)

[0050] In a zoom lens according to an embodiment, the first negative lens group may be configured to have at least one aspherical surface. By providing an aspherical surface in the first negative lens group, the effect of the aspherical surface can be utilized at a position where the chief ray of the off-axis light beam is high, making it possible to efficiently correct off-axis aberrations such as field curvature.

[0051] In addition, in the zoom lens according to one embodiment, the positive lens group GRs may be configured to have at least one aspherical surface. In the zoom lens according to one embodiment, a light beam diverged by the first negative lens group is incident on the positive lens group GRs, causing the axial light beam to have a high ray height in the positive lens group GRs. Therefore, the configuration of the positive lens group GRs is important for correcting spherical aberration and coma at the telephoto end. By providing an aspherical surface in the positive lens group GRs, the effect of the aspherical surface can be utilized at positions where the axial light beam has a high ray height, thereby enabling efficient correction of spherical aberration and coma.

[0052] In addition, in a zoom lens according to an embodiment, all of the lens groups that move during zooming may move monotonically toward the object side when zooming from the wide-angle end to the telephoto end. In many retrofocus wide-angle zoom lenses, the first negative lens group moves along a convex path toward the image plane when zooming from the wide-angle end to the telephoto end, so that the first negative lens group acts as a compensator to correct fluctuations in the focal plane caused by zooming. However, in a zoom lens according to an embodiment, the first negative lens group is configured to remain stationary during zooming in order to reduce the weight of the movable groups, so a group other than the first negative lens group must be provided to act as a compensator. One possible method for achieving this is to divide the negative refractive power of the first negative lens group and move the divided image-side group along a convex path toward the image plane when zooming from the wide-angle end to the telephoto end. In this case, the divided image-plane-side group can play the role of a compensator, but creating a group that plays the role of a compensator on its own increases the number of movable groups, leading to an increase in the size of the entire lens system, including the moving mechanism.The zoom lens according to one embodiment is a retrofocus wide-angle zoom lens, in which magnification is changed by moving the rear group, which has positive refractive power, toward the object side relative to the first negative lens group, which has negative refractive power.By dividing the rear group into multiple lens groups and making each lens group follow an independent path as it moves toward the object side during zooming from the wide-angle end to the telephoto end, each lens group can share the roles of changing magnification, acting as a compensator, and correcting variation in field curvature, with a minimal configuration.

[0053] Furthermore, in the zoom lens according to one embodiment, the lens group closest to the image plane among the multiple lens groups may be stationary during zooming. When the zoom lens according to one embodiment is adapted for use in an electric zoom lens for an interchangeable lens camera, if the lens group closest to the image plane is a movable group, the moving mechanism, including the motor, will be exposed from the mount, reducing robustness. Therefore, it is preferable to make the lens group closest to the image plane a fixed group, thereby preventing direct external contact with the moving mechanism and improving robustness.

[0054] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (7): 0.8<(R1r+R2f) / (R2f-R1r)<12.0 ……(7) however, R1r: radius of curvature of the image-side surface of the first negative meniscus lens R2f: radius of curvature of the object-side surface of the second negative meniscus lens Let's say.

[0055] Conditional expression (7) is defined to suppress off-axis aberrations and ensure ease of lens fabrication, and defines the shape of the air lens between the first negative meniscus lens and the second negative meniscus lens. Below the lower limit of conditional expression (7), it becomes difficult to correct off-axis aberrations, including lateral chromatic aberration, at the wide-angle end. On the other hand, above the upper limit of conditional expression (7), the open angle of the image-side surface of the first negative meniscus lens becomes large, making fabrication difficult.

[0056] It should be noted that a better effect can be obtained by setting the numerical range of conditional expression (7) to the following conditional expression (7A) and further to the following conditional expression (7B). 1.0<(R1r+R2f) / (R2f-R1r)<10.6 ……(7A) 3.1<(R1r+R2f) / (R2f-R1r)<7.5 ……(7B)

[0057] Furthermore, the zoom lens according to an embodiment may satisfy the following conditional expression (8): 1.2<(fG2) / (fw)<4.9 ……(8) however, fG2: focal length of the second negative meniscus lens fw: focal length of the entire system at the wide-angle end Let's say.

[0058] Conditional expression (8) is stipulated to achieve a wider angle and a smaller effective diameter of the first negative meniscus lens, which is the lens closest to the object. Conditional expression (8) is a conditional expression for appropriately setting the ratio between the focal length of the second negative meniscus lens and the focal length of the entire system at the wide-angle end. If the lower limit of conditional expression (8) is not met, the second negative meniscus lens will bear most of the negative refractive power of the first negative lens group, and the effective diameter of the first negative meniscus lens, which is located on the object side of the second negative meniscus lens, will become larger. On the other hand, if the upper limit of conditional expression (8) is exceeded, the negative refractive power of the second negative meniscus lens will become weak, making it difficult to achieve a wider angle.

[0059] It should be noted that a better effect can be obtained by setting the numerical range of conditional expression (8) to the following conditional expression (8A) and further to the following conditional expression (8B). 1.5<(fG2) / (fw)<4.2 ……(8A) 1.95<(fG2) / (fw)<4.10 ……(8B)

[0060] Furthermore, the zoom lens according to an embodiment may be configured to have a mechanism for electrically driving all of the lens groups that move during zooming, among the plurality of lens groups.

[0061] <3. Application example to imaging device> Next, a specific example of application of the zoom lens according to an embodiment of the present disclosure to an imaging device will be described.

[0062] 157 shows an example of the configuration of an imaging device 100 to which a zoom lens according to one embodiment is applied. This imaging device 100 is, for example, a digital still camera, and includes a camera block 110, a camera signal processing unit 20, an image processing unit 30, an LCD (Liquid Crystal Display) 40, an R / W (Reader / Writer) 50, a CPU (Central Processing Unit) 60, an input unit 70, and a lens drive control unit 80.

[0063] The camera block 110 is responsible for the imaging function and has an imaging lens 111 and an imaging element 112 such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The imaging element 112 converts an optical image formed by the imaging lens 111 into an electrical signal, and outputs an imaging signal (image signal) corresponding to the optical image. The imaging lens 111 can be any of the zoom lenses 1 to 12 according to the configuration examples shown in FIG. 1 and the like.

[0064] The camera signal processing unit 20 performs various signal processing on the image signal output from the image sensor 112, such as analog-to-digital conversion, noise removal, image quality correction, and conversion into luminance and color difference signals.

[0065] The image processing unit 30 performs recording and playback processing of image signals, and performs compression, encoding, decompression and decoding processing of image signals based on a predetermined image data format, as well as conversion processing of data specifications such as resolution.

[0066] The LCD 40 has a function of displaying various data such as the operation status of the user on the input unit 70 and captured images. The R / W 50 writes image data encoded by the image processing unit 30 to the memory card 1000 and reads image data recorded on the memory card 1000. The memory card 1000 is, for example, a semiconductor memory that is detachable from a slot connected to the R / W 50.

[0067] The CPU 60 functions as a control processing unit that controls each circuit block provided in the imaging device 100, and controls each circuit block based on instruction input signals and the like from the input unit 70. The input unit 70 is made up of various switches and the like that are operated as required by the user. The input unit 70 is composed of, for example, a shutter release button for operating the shutter and a selection switch for selecting an operation mode, and is configured to output instruction input signals to the CPU 60 in response to user operations. The lens drive control unit 80 controls the drive of the lenses arranged in the camera block 110, and is configured to control motors and the like (not shown) that drive each lens of the imaging lens 111 based on control signals from the CPU 60.

[0068] The operation of the imaging device 100 will be described below. In a standby state for photographing, under the control of the CPU 60, an image signal corresponding to an image photographed by the camera block 110 is output to the LCD 40 via the camera signal processing unit 20 and displayed as a camera-through image. Furthermore, when an instruction input signal for zooming or focusing is input from the input unit 70, for example, the CPU 60 outputs a control signal to the lens drive control unit 80, and a predetermined lens of the imaging lens 111 moves under the control of the lens drive control unit 80.

[0069] When a shutter (not shown) of the camera block 110 is operated by an instruction input signal from the input unit 70, the captured image signal is output from the camera signal processing unit 20 to the image processing unit 30, where it is compressed and encoded and converted into digital data in a predetermined data format. The converted data is output to the R / W 50 and written to the memory card 1000.

[0070] Focusing is performed by the lens drive control unit 80 moving a predetermined lens of the imaging lens 111 based on a control signal from the CPU 60, for example, when the shutter release button on the input unit 70 is pressed halfway or fully pressed for recording (photographing).

[0071] When reproducing image data recorded on the memory card 1000, the R / W 50 reads out the specified image data from the memory card 1000 in response to an operation on the input unit 70, and the image processing unit 30 performs an expansion / decoding process. After that, the reproduced image signal is output to the LCD 40, and the reproduced image is displayed.

[0072] Although the above-described embodiment shows an example in which the imaging device is applied to a digital still camera, the application range of the imaging device is not limited to digital still cameras and can be applied to various other imaging devices. For example, the imaging device can be applied to digital single-lens reflex cameras, digital non-reflex cameras, digital video cameras, surveillance cameras, etc. Furthermore, the imaging device can be widely used as a camera unit of digital input / output devices such as mobile phones with built-in cameras and information terminals with built-in cameras. Furthermore, the imaging device can be applied to cameras with interchangeable lenses. [Example]

[0073] <4. Numerical examples of lenses> Next, specific numerical examples of the zoom lens according to an embodiment of the present disclosure will be described. Here, examples will be described in which specific numerical values ​​are applied to zoom lenses 1 to 12 according to the configuration examples shown in FIG. 1 and the like.

[0074] The meanings of symbols used in the following tables and explanations are as follows: "Si" indicates the number of the i-th surface, with the symbols increasing sequentially from the object side. "ri" indicates the paraxial radius of curvature of the i-th surface (mm). "di" indicates the axial distance (mm) between the i-th surface and the (i+1)-th surface. "ndi" indicates the refractive index of the material of the optical element that makes up the i-th surface at the d-line (wavelength 587.6 nm). "νdi" indicates the Abbe number of the material of the optical element that makes up the i-th surface at the d-line. "φi" indicates the clear aperture (mm) of the i-th surface. A portion where the "ri" value is "∞" indicates a flat surface, an aperture surface, etc. "ASP" in the surface number (Si) column indicates that the surface is aspherical. "STO" in the surface number column indicates that an aperture stop St is located at the corresponding position. "OBJ" in the surface number column indicates that the surface is the object surface (subject surface). "IMG" in the surface number column indicates that the surface in question is the image plane. "f" indicates the focal length of the entire system (unit: mm). "Fno" indicates the maximum aperture (F-number). "ω" indicates the half angle of view (unit: °). "Y" indicates the image height (unit: mm). "L" indicates the total optical length (the distance on the optical axis from the surface closest to the object to the image plane IMG) (unit: mm).

[0075] Furthermore, some of the lenses used in the examples have aspherical lens surfaces. The aspherical shape is defined by the following formula. In the tables showing the aspherical coefficients described later, "Ei" is an exponential expression with the base 10, that is, "10 -i " For example, "0.12345E-05" represents "0.12345 x 10 -5 " represents.

[0076] (Aspherical formula) x=c 2 y 2 / (1+(1-(1+k)c 2 y 2 ) 1 / 2 )+A4·y 4 +A6·y 6 +A8·y 8 +A10·y 10+A12·y 12 Here, the distance from the vertex of the lens surface along the optical axis (sag) is "x," the height in the direction perpendicular to the optical axis is "y," the paraxial curvature at the vertex of the lens surface (the reciprocal of the radius of curvature) is "c," and the conic constant is "k." A4, A6, A8, A10, and A12 are the 4th-, 6th-, 8th-, 10th-, and 12th-order aspheric coefficients, respectively.

[0077] [Example 1] Table 1 shows basic lens data for the zoom lens 1 according to Example 1 shown in FIG. 1 . Table 2 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 1 according to Example 1. Table 3 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 1 according to Example 1. Table 2 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 3 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 4 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 1 according to Example 1. Table 5 shows the starting surface and focal length (unit: mm) of each lens group in the zoom lens 1 according to Example 1.

[0078] The zoom lens 1 of Example 1 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0079] In the zoom lens 1 of Example 1, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0080] The zoom lens 1 according to Example 1 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close object distance, the third lens group GR3 moves toward the object along the optical axis.

[0081] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L13 is a negative biconcave lens. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0082] The second lens group GR2 consists of, in order from the object side to the image side, lenses L21 and L22, an aperture stop St, and lenses L23 and L24. Lens L21 is a biconvex positive lens with aspherical surfaces on both sides. Lens L22 is a negative meniscus lens with its convex surface facing the object side. Lens L23 is a negative meniscus lens with its convex surface facing the object side. Lens L24 is a biconvex positive lens. Lenses L23 and L24 form a cemented lens.

[0083] The third lens group GR3 consists of, in order from the object side to the image side, lens L31 and lens L32. Lens L31 is a negative meniscus lens with its concave surface facing the object side. Lens L32 is a positive biconvex lens with aspherical surfaces on both sides.

[0084] The fourth lens group GR4 consists of, in order from the object side to the image side, lens L41 and lens L42. Lens L41 is a positive meniscus lens with its concave surface facing the object side. Lens L42 is a negative biconcave lens with aspherical surfaces on both sides.

[0085] The fifth lens group GR5 is made up of a lens L51, which is a positive meniscus lens with its concave surface facing the object side.

[0086] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0087] [Table 1]

[0088] [Table 2]

[0089] [Table 3]

[0090] [Table 4]

[0091] [Table 5]

[0092] FIG. 2 shows longitudinal aberration of the zoom lens 1 according to Example 1 at the wide-angle end when focusing on infinity. FIG. 3 shows longitudinal aberration of the zoom lens 1 according to Example 1 at an intermediate position when focusing on infinity. FIG. 4 shows longitudinal aberration of the zoom lens 1 according to Example 1 at the telephoto end when focusing on infinity. FIG. 5 shows longitudinal aberration of the zoom lens 1 according to Example 1 at the wide-angle end when focusing on a close distance. FIG. 6 shows longitudinal aberration of the zoom lens 1 according to Example 1 at an intermediate position when focusing on a close distance. FIG. 7 shows longitudinal aberration of the zoom lens 1 according to Example 1 at the telephoto end when focusing on a close distance. FIG. 8 shows lateral aberration of the zoom lens 1 according to Example 1 at the wide-angle end when focusing on infinity. FIG. 9 shows lateral aberration of the zoom lens 1 according to Example 1 at an intermediate position when focusing on infinity. FIG. 10 shows lateral aberration of the zoom lens 1 according to Example 1 at the telephoto end when focusing on infinity. Fig. 11 shows lateral aberrations of the zoom lens 1 according to Example 1 at the wide-angle end and when focusing on a close distance. Fig. 12 shows lateral aberrations of the zoom lens 1 according to Example 1 at the intermediate position and when focusing on a close distance. Fig. 13 shows lateral aberrations of the zoom lens 1 according to Example 1 at the telephoto end and when focusing on a close distance.

[0093] Figures 2 to 7 show longitudinal aberrations, including spherical aberration, astigmatism (field curvature), and distortion. In the spherical aberration diagrams in Figures 2 to 7 and the lateral aberration diagrams in Figures 8 to 13, the solid line indicates values ​​at the d-line (587.56 nm), the dashed-dotted line indicates values ​​at the g-line (435.84 nm), and the dashed line indicates values ​​at the C-line (656.27 nm). In the astigmatism diagrams in Figures 2 to 7, S indicates values ​​at the sagittal image plane, and T indicates values ​​at the tangential image plane. In the astigmatism diagrams and distortion diagrams in Figures 2 to 7, values ​​at the d-line are shown. The same applies to the aberration diagrams in the other examples that follow.

[0094] As can be seen from each aberration diagram, the zoom lens 1 according to Example 1 has excellent correction of various aberrations and has excellent imaging performance.

[0095] [Example 2] Table 6 shows basic lens data for the zoom lens 2 according to Example 2 shown in FIG. 14. Table 7 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 2 according to Example 2. Table 8 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 2 according to Example 2. Table 7 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 8 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 9 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 2 according to Example 2. Table 10 shows the starting surface and focal length (unit: mm) of each lens group in the zoom lens 2 according to Example 2.

[0096] The zoom lens 2 according to Example 2 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0097] In the zoom lens 2 of Example 2, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0098] The zoom lens 2 according to Example 2 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close object distance, the third lens group GR3 moves toward the object along the optical axis.

[0099] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L13 is a negative biconcave lens. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0100] The second lens group GR2 consists, in order from the object side to the image plane side, of lenses L21 and L22, an aperture stop St, and lenses L23 and L24. Lens L21 is a positive meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L22 is a positive meniscus lens with a convex surface facing the object side. Lens L23 is a negative meniscus lens with a convex surface facing the object side. Lens L24 is a positive lens with a biconvex shape. Lenses L23 and L24 form a cemented lens.

[0101] The third lens group GR3 is composed of, in order from the object side to the image plane side, lenses L31 to L33. Lens L31 is a positive meniscus lens with a convex surface facing the object side. Lens L32 is a negative meniscus lens with a convex surface facing the object side. Lenses L31 and L32 form a cemented lens. Lens L33 is a positive biconvex lens.

[0102] The fourth lens group GR4 is composed of, in order from the object side to the image plane side, lenses L41 to L44. Lens L41 is a biconvex positive lens. Lens L42 is a positive meniscus lens with its concave surface facing the object side. Lens L43 is a biconcave negative lens. Lenses L42 and L43 form a cemented lens. Lens L44 is a negative meniscus lens with its concave surface facing the object side and both surfaces of which are aspherical.

[0103] The fifth lens group GR5 is made up of a lens L51, which is a positive meniscus lens with its concave surface facing the object side.

[0104] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0105] [Table 6]

[0106] [Table 7]

[0107] [Table 8]

[0108] [Table 9]

[0109] [Table 10]

[0110] FIG. 15 shows longitudinal aberration of the zoom lens 2 according to Example 2 at the wide-angle end when focusing on infinity. FIG. 16 shows longitudinal aberration of the zoom lens 2 according to Example 2 at an intermediate position when focusing on infinity. FIG. 17 shows longitudinal aberration of the zoom lens 2 according to Example 2 at the telephoto end when focusing on infinity. FIG. 18 shows longitudinal aberration of the zoom lens 2 according to Example 2 at the wide-angle end when focusing on a close distance. FIG. 19 shows longitudinal aberration of the zoom lens 2 according to Example 2 at an intermediate position when focusing on a close distance. FIG. 20 shows longitudinal aberration of the zoom lens 2 according to Example 2 at the telephoto end when focusing on a close distance. FIG. 21 shows lateral aberration of the zoom lens 2 according to Example 2 at the wide-angle end when focusing on infinity. FIG. 22 shows lateral aberration of the zoom lens 2 according to Example 2 at an intermediate position when focusing on infinity. FIG. 23 shows lateral aberration of the zoom lens 2 according to Example 2 at the telephoto end when focusing on infinity. Fig. 24 shows lateral aberrations of the zoom lens 2 according to Example 2 at the wide-angle end and when focusing on a close distance. Fig. 25 shows lateral aberrations of the zoom lens 2 according to Example 2 at the intermediate position and when focusing on a close distance. Fig. 26 shows lateral aberrations of the zoom lens 2 according to Example 2 at the telephoto end and when focusing on a close distance.

[0111] As can be seen from each aberration diagram, the zoom lens 2 according to Example 2 has excellent correction of various aberrations and has excellent imaging performance.

[0112] [Example 3] Table 11 shows basic lens data for the zoom lens 3 according to Example 3 shown in FIG. 27. Table 12 shows values ​​for the focal length f, F-number, full angle of view 2ω, image height Y, and total optical length L of the entire system of the zoom lens 3 according to Example 3. Table 13 shows data on surface spacings that are variable during zooming and focusing in the zoom lens 3 according to Example 3. Table 12 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 13 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 14 shows values ​​of coefficients representing the shape of the aspherical surfaces in the zoom lens 3 according to Example 3. Table 15 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 3 according to Example 3.

[0113] The zoom lens 3 of Example 3 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0114] In the zoom lens 3 of Example 3, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0115] The zoom lens 3 according to Example 3 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close object distance, the third lens group GR3 moves toward the object along the optical axis.

[0116] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L13 is a negative biconcave lens. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0117] The second lens group GR2 is composed of, in order from the object side to the image side, lenses L21 to L23, an aperture stop St, and lenses L24 and L25. Lens L21 is a biconvex positive lens with an aspherical surface on the object side. Lens L22 is a negative meniscus lens with its concave surface facing the object side. Lenses L21 and L22 form a cemented lens. Lens L23 is a negative meniscus lens with its convex surface facing the object side. Lens L24 is a negative meniscus lens with its convex surface facing the object side. Lens L25 is a biconvex positive lens. Lenses L24 and L25 form a cemented lens.

[0118] The third lens group GR3 consists of, in order from the object side to the image side, lens L31 and lens L32. Lens L31 is a negative meniscus lens with its concave surface facing the object side. Lens L32 is a positive biconvex lens with aspherical surfaces on both sides.

[0119] The fourth lens group GR4 is composed of, in order from the object side to the image plane side, lenses L41 to L44. Lens L41 is a positive meniscus lens with a concave surface facing the object side. Lens L42 is a positive meniscus lens with a concave surface facing the object side. Lens L43 is a negative meniscus lens with a concave surface facing the object side. Lenses L42 and L43 form a cemented lens. Lens L44 is composed of a biconcave negative lens with aspherical surfaces on both sides.

[0120] The fifth lens group GR5 is made up of a lens L51, which is a positive meniscus lens with its concave surface facing the object side.

[0121] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0122] [Table 11]

[0123] [Table 12]

[0124] [Table 13]

[0125] [Table 14]

[0126] [Table 15]

[0127] FIG. 28 shows longitudinal aberration of the zoom lens 3 according to Example 3 at the wide-angle end when focusing on infinity. FIG. 29 shows longitudinal aberration of the zoom lens 3 according to Example 3 at an intermediate position when focusing on infinity. FIG. 30 shows longitudinal aberration of the zoom lens 3 according to Example 3 at the telephoto end when focusing on infinity. FIG. 31 shows longitudinal aberration of the zoom lens 3 according to Example 3 at the wide-angle end when focusing on a close distance. FIG. 32 shows longitudinal aberration of the zoom lens 3 according to Example 3 at an intermediate position when focusing on a close distance. FIG. 33 shows longitudinal aberration of the zoom lens 3 according to Example 3 at the telephoto end when focusing on a close distance. FIG. 34 shows lateral aberration of the zoom lens 3 according to Example 3 at the wide-angle end when focusing on infinity. FIG. 35 shows lateral aberration of the zoom lens 3 according to Example 3 at an intermediate position when focusing on infinity. FIG. 36 shows lateral aberration of the zoom lens 3 according to Example 3 at the telephoto end when focusing on infinity. Fig. 37 shows the lateral aberration of the zoom lens 3 according to Example 3 at the wide-angle end and when focusing on a close distance. Fig. 38 shows the lateral aberration of the zoom lens 3 according to Example 3 at the intermediate position and when focusing on a close distance. Fig. 39 shows the lateral aberration of the zoom lens 3 according to Example 3 at the telephoto end and when focusing on a close distance.

[0128] As can be seen from each aberration diagram, the zoom lens 3 according to Example 3 has excellent correction of various aberrations and has excellent imaging performance.

[0129] [Example 4] Table 16 shows basic lens data for the zoom lens 4 according to Example 4 shown in FIG. 40. Table 17 shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 4 according to Example 4. Table 18 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 4 according to Example 4. Table 17 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 18 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 19 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 4 according to Example 4. Table 20 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 4 according to Example 4.

[0130] The zoom lens 4 of Example 4 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0131] In the zoom lens 4 of Example 4, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0132] The zoom lens 4 according to Example 4 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close object distance, the third lens group GR3 moves toward the object along the optical axis.

[0133] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L13 is a negative biconcave lens. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0134] The second lens group GR2 consists of, in order from the object side to the image plane side, a lens L21, an aperture stop St, and lenses L22 and L23. The lens L21 is a biconvex positive lens with aspherical surfaces on both sides. The lens L22 is a negative meniscus lens with its convex surface facing the object side. The lens L23 is a biconvex positive lens. The lenses L22 and L23 form a cemented lens.

[0135] The third lens group GR3 consists of, in order from the object side to the image side, a lens L31 and a lens L32. The lens L31 is a negative meniscus lens with its concave surface facing the object side. The lens L32 is a positive meniscus lens with its concave surface facing the object side.

[0136] The fourth lens group GR4 consists of, in order from the object side to the image plane side, lenses L41 to L44. Lens L41 is a positive meniscus lens with a concave surface facing the object side. Lens L42 is a positive meniscus lens with a concave surface facing the object side. Lens L43 is a negative meniscus lens with a concave surface facing the object side. Lenses L42 and L43 form a cemented lens. Lens L44 is a negative meniscus lens with aspherical surfaces on both sides with its concave surface facing the object side.

[0137] The fifth lens group GR5 is made up of a lens L51, which is a positive meniscus lens with its concave surface facing the object side.

[0138] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0139] [Table 16]

[0140] [Table 17]

[0141] [Table 18]

[0142] [Table 19]

[0143] [Table 20]

[0144] FIG. 41 shows longitudinal aberration of the zoom lens 4 according to Example 4 at the wide-angle end when focusing on infinity. FIG. 42 shows longitudinal aberration of the zoom lens 4 according to Example 4 at an intermediate position when focusing on infinity. FIG. 43 shows longitudinal aberration of the zoom lens 4 according to Example 4 at the telephoto end when focusing on infinity. FIG. 44 shows longitudinal aberration of the zoom lens 4 according to Example 4 at the wide-angle end when focusing on a close distance. FIG. 45 shows longitudinal aberration of the zoom lens 4 according to Example 4 at an intermediate position when focusing on a close distance. FIG. 46 shows longitudinal aberration of the zoom lens 4 according to Example 4 at the telephoto end when focusing on a close distance. FIG. 47 shows lateral aberration of the zoom lens 4 according to Example 4 at the wide-angle end when focusing on infinity. FIG. 48 shows lateral aberration of the zoom lens 4 according to Example 4 at an intermediate position when focusing on infinity. FIG. 49 shows lateral aberration of the zoom lens 4 according to Example 4 at the telephoto end when focusing on infinity. Fig. 50 shows the lateral aberration of the zoom lens 4 according to Example 4 at the wide-angle end and when focusing on a close distance. Fig. 51 shows the lateral aberration of the zoom lens 4 according to Example 4 at the intermediate position and when focusing on a close distance. Fig. 52 shows the lateral aberration of the zoom lens 4 according to Example 4 at the telephoto end and when focusing on a close distance.

[0145] As can be seen from each aberration diagram, the zoom lens 4 according to Example 4 has excellent correction of various aberrations and has excellent imaging performance.

[0146] [Example 5] Table 21 shows basic lens data for the zoom lens 5 according to Example 5 shown in FIG. 53. Table 22 shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 5 according to Example 5. Table 23 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 5 according to Example 5. Table 22 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 23 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 24 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 5 according to Example 5. Table 25 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 5 according to Example 5.

[0147] The zoom lens 5 of Example 5 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0148] In the zoom lens 5 according to Example 5, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0149] The zoom lens 5 according to Example 5 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close object distance, the third lens group GR3 moves toward the object along the optical axis.

[0150] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L13 is a negative biconcave lens. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0151] The second lens group GR2 consists of, in order from the object side to the image plane side, a lens L21, an aperture stop St, and lenses L22 and L23. The lens L21 is a biconvex positive lens with aspherical surfaces on both sides. The lens L22 is a negative meniscus lens with its convex surface facing the object side. The lens L23 is a biconvex positive lens. The lenses L22 and L23 form a cemented lens.

[0152] The third lens group GR3 is composed of, in order from the object side to the image side, a lens L31 and a lens L32. The lens L31 is a negative meniscus lens with its concave surface facing the object side. The lens L32 is a positive biconvex lens.

[0153] The fourth lens group GR4 consists of, in order from the object side to the image side, lenses L41 to L43. Lens L41 is a positive meniscus lens with a concave surface facing the object side. Lens L42 is a negative meniscus lens with a concave surface facing the object side. Lens L43 is a negative meniscus lens with aspherical surfaces on both sides and with a concave surface facing the object side.

[0154] The fifth lens group GR5 is made up of a lens L51, which is a positive meniscus lens with its concave surface facing the object side.

[0155] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0156] [Table 21]

[0157] [Table 22]

[0158] [Table 23]

[0159] [Table 24]

[0160] [Table 25]

[0161] FIG. 54 shows longitudinal aberration of the zoom lens 5 according to Example 5 at the wide-angle end when focusing on infinity. FIG. 55 shows longitudinal aberration of the zoom lens 5 according to Example 5 at an intermediate position when focusing on infinity. FIG. 56 shows longitudinal aberration of the zoom lens 5 according to Example 5 at the telephoto end when focusing on infinity. FIG. 57 shows longitudinal aberration of the zoom lens 5 according to Example 5 at the wide-angle end when focusing on a close distance. FIG. 58 shows longitudinal aberration of the zoom lens 5 according to Example 5 at an intermediate position when focusing on a close distance. FIG. 59 shows longitudinal aberration of the zoom lens 5 according to Example 5 at the telephoto end when focusing on a close distance. FIG. 60 shows lateral aberration of the zoom lens 5 according to Example 5 at the wide-angle end when focusing on infinity. FIG. 61 shows lateral aberration of the zoom lens 5 according to Example 5 at an intermediate position when focusing on infinity. FIG. 62 shows lateral aberration of the zoom lens 5 according to Example 5 at the telephoto end when focusing on infinity. Fig. 63 shows the lateral aberration of the zoom lens 5 according to Example 5 at the wide-angle end and when focusing on a close distance. Fig. 64 shows the lateral aberration of the zoom lens 5 according to Example 5 at the intermediate position and when focusing on a close distance. Fig. 65 shows the lateral aberration of the zoom lens 5 according to Example 5 at the telephoto end and when focusing on a close distance.

[0162] As can be seen from each aberration diagram, the zoom lens 5 according to Example 5 has excellent correction of various aberrations and has excellent imaging performance.

[0163] [Example 6] Table 26 shows basic lens data for the zoom lens 6 according to Example 6 shown in FIG. 66. Table 27 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system of the zoom lens 6 according to Example 6. Table 28 shows data on surface spacings that are variable during zooming and focusing in the zoom lens 6 according to Example 6. Table 27 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 28 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 28 also shows the diameter (φ9) of the unnecessary light cutting aperture Stc, which is variable during zooming, at the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele). [Table 29] shows the values ​​of coefficients representing the shape of the aspherical surface in the zoom lens 6 according to Example 6. [Table 30] shows the starting surface and focal length (unit: mm) of each lens group in the zoom lens 6 according to Example 6.

[0164] The zoom lens 6 of Example 6 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 having negative refractive power, a third lens group GR3 including an aperture stop St and having positive refractive power, a fourth lens group GR4 having positive refractive power, and a fifth lens group GR5 having negative refractive power, which are arranged in this order from the object side to the image plane side.

[0165] In the zoom lens 6 according to Example 6, the first lens group GR1 corresponds to the first negative lens group described above, the third lens group GR3 corresponds to the positive lens group GRs described above, and the fifth lens group GR5 corresponds to the second negative lens group described above.

[0166] The zoom lens 6 according to Example 6 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 remains stationary during zooming. When focusing from infinity to a close object distance, the fourth lens group GR4 moves toward the object in the optical axis direction. The second lens group GR2 also has, closest to the object, an unwanted light-cutting aperture Stc that functions as an aperture whose diameter changes during zooming, and functions to cut out unwanted light at intermediate image heights, etc.

[0167] The first lens group GR1 consists of, in order from the object side to the image side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with an aspherical surface on the image side and a convex surface facing the object side. Lens L13 is a negative meniscus lens with a concave surface facing the object side. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0168] The second lens group GR2 is composed of, in order from the object side to the image plane side, an unwanted light cutting stop Stc and a lens L21. The lens L21 is a negative meniscus lens with a concave surface facing the object side.

[0169] The third lens group GR3 consists, in order from the object side to the image plane side, of an aperture stop St and lenses L31 to L35. Lens L31 is a negative meniscus lens with a convex surface facing the object side. Lens L32 is a positive biconvex lens. Lenses L31 and L32 form a cemented lens. Lens L33 is a positive meniscus lens with aspherical surfaces on both sides and with a convex surface facing the object side. Lens L34 is a negative meniscus lens with a convex surface facing the object side. Lens L35 is a positive meniscus lens with a convex surface facing the object side. Lenses L34 and L35 form a cemented lens.

[0170] The fourth lens group GR4 is made up of a lens L41, which is a positive biconvex lens.

[0171] The fifth lens group GR5 consists of, in order from the object side to the image plane side, lenses L51 to L54. Lens L51 is a positive meniscus lens with its concave surface facing the object side. Lens L52 is a positive meniscus lens with its concave surface facing the object side. Lens L53 is a negative meniscus lens with its concave surface facing the object side. Lenses L52 and L53 form a cemented lens. Lens L54 is a negative meniscus lens with its concave surface facing the object side and both surfaces of which are aspherical.

[0172] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0173] [Table 26]

[0174] [Table 27]

[0175] [Table 28]

[0176] [Table 29]

[0177] [Table 30]

[0178] FIG. 67 shows longitudinal aberration of the zoom lens 6 according to Example 6 at the wide-angle end when focusing on infinity. FIG. 68 shows longitudinal aberration of the zoom lens 6 according to Example 6 at an intermediate position when focusing on infinity. FIG. 69 shows longitudinal aberration of the zoom lens 6 according to Example 6 at the telephoto end when focusing on infinity. FIG. 70 shows longitudinal aberration of the zoom lens 6 according to Example 6 at the wide-angle end when focusing on a close distance. FIG. 71 shows longitudinal aberration of the zoom lens 6 according to Example 6 at an intermediate position when focusing on a close distance. FIG. 72 shows longitudinal aberration of the zoom lens 6 according to Example 6 at the telephoto end when focusing on a close distance. FIG. 73 shows lateral aberration of the zoom lens 6 according to Example 6 at the wide-angle end when focusing on infinity. FIG. 74 shows lateral aberration of the zoom lens 6 according to Example 6 at an intermediate position when focusing on infinity. FIG. 75 shows lateral aberration of the zoom lens 6 according to Example 6 at the telephoto end when focusing on infinity. Fig. 76 shows the lateral aberration of the zoom lens 6 according to Example 6 at the wide-angle end and when focusing on a close distance. Fig. 77 shows the lateral aberration of the zoom lens 6 according to Example 6 at the intermediate position and when focusing on a close distance. Fig. 78 shows the lateral aberration of the zoom lens 6 according to Example 6 at the telephoto end and when focusing on a close distance.

[0179] As can be seen from each aberration diagram, the zoom lens 6 according to Example 6 has excellent correction of various aberrations and has excellent imaging performance.

[0180] [Example 7] Table 31 shows basic lens data for the zoom lens 7 according to Example 7 shown in FIG. 79. Table 32 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system of the zoom lens 7 according to Example 7. Table 33 shows data on surface spacings that are variable during zooming and focusing in the zoom lens 7 according to Example 7. Table 32 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 33 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 33 also shows the diameter (φ9) of the unnecessary light cutting aperture Stc, which is variable during zooming, at the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele). [Table 34] shows the values ​​of coefficients representing the shape of the aspherical surface in the zoom lens 7 according to Example 7. [Table 35] shows the initial surface and focal length (unit: mm) of each lens group in the zoom lens 7 according to Example 7.

[0181] The zoom lens 7 according to Example 7 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 having negative refractive power, a third lens group GR3 including an aperture stop St and having positive refractive power, a fourth lens group GR4 having positive refractive power, and a fifth lens group GR5 having negative refractive power, which are arranged in this order from the object side to the image plane side.

[0182] In the zoom lens 7 according to Example 7, the first lens group GR1 corresponds to the first negative lens group described above, the third lens group GR3 corresponds to the positive lens group GRs described above, and the fifth lens group GR5 corresponds to the second negative lens group described above.

[0183] The zoom lens 7 according to Example 7 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 remains stationary during zooming. When focusing from infinity to a close object distance, the fourth lens group GR4 moves toward the object in the optical axis direction. The second lens group GR2 also has, closest to the object, an unwanted light-cutting aperture Stc that functions as an aperture whose diameter changes during zooming, and functions to cut out unwanted light at intermediate image heights, etc.

[0184] The first lens group GR1 consists of, in order from the object side to the image side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with an aspherical surface on the image side and a convex surface facing the object side. Lens L13 is a negative meniscus lens with a concave surface facing the object side. Lens L14 is a positive biconvex lens.

[0185] The second lens group GR2 is composed of, in order from the object side to the image plane side, an unwanted light cutting stop Stc and a lens L21. The lens L21 is a negative meniscus lens with a concave surface facing the object side.

[0186] The third lens group GR3 consists, in order from the object side to the image plane side, of an aperture stop St and lenses L31 to L34. Lens L31 is a positive meniscus lens with aspherical surfaces on both sides and a convex surface facing the object side. Lens L32 is a positive biconvex lens. Lens L33 is a negative meniscus lens with a convex surface facing the object side. Lens L34 is a positive meniscus lens with a convex surface facing the object side. Lenses L33 and L34 form a cemented lens.

[0187] The fourth lens group GR4 is made up of a lens L41, which is a positive biconvex lens.

[0188] The fifth lens group GR5 consists of, in order from the object side to the image plane side, lenses L51 to L54. Lens L51 is a biconvex positive lens. Lens L52 is a positive meniscus lens with its concave surface facing the object side. Lens L53 is a biconcave negative lens. Lenses L52 and L53 form a cemented lens. Lens L54 is a negative meniscus lens with its concave surface facing the object side and both surfaces of which are aspherical.

[0189] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0190] [Table 31]

[0191] [Table 32]

[0192] [Table 33]

[0193] [Table 34]

[0194] [Table 35]

[0195] FIG. 80 shows longitudinal aberration of the zoom lens 7 according to Example 7 at the wide-angle end when focusing on infinity. FIG. 81 shows longitudinal aberration of the zoom lens 7 according to Example 7 at an intermediate position when focusing on infinity. FIG. 82 shows longitudinal aberration of the zoom lens 7 according to Example 7 at the telephoto end when focusing on infinity. FIG. 83 shows longitudinal aberration of the zoom lens 7 according to Example 7 at the wide-angle end when focusing on a close distance. FIG. 84 shows longitudinal aberration of the zoom lens 7 according to Example 7 at an intermediate position when focusing on a close distance. FIG. 85 shows longitudinal aberration of the zoom lens 7 according to Example 7 at the telephoto end when focusing on a close distance. FIG. 86 shows lateral aberration of the zoom lens 7 according to Example 7 at the wide-angle end when focusing on infinity. FIG. 87 shows lateral aberration of the zoom lens 7 according to Example 7 at an intermediate position when focusing on infinity. FIG. 88 shows lateral aberration of the zoom lens 7 according to Example 7 at the telephoto end when focusing on infinity. Fig. 89 shows the lateral aberration of the zoom lens 7 according to Example 7 at the wide-angle end and when focusing on a close distance. Fig. 90 shows the lateral aberration of the zoom lens 7 according to Example 7 at the intermediate position and when focusing on a close distance. Fig. 91 shows the lateral aberration of the zoom lens 7 according to Example 7 at the telephoto end and when focusing on a close distance.

[0196] As can be seen from each aberration diagram, the zoom lens 7 according to Example 7 has excellent correction of various aberrations and has excellent imaging performance.

[0197] [Example 8] Table 36 shows basic lens data for the zoom lens 8 according to Example 8 shown in FIG. 92. Table 37 shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 8 according to Example 8. Table 38 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 8 according to Example 8. Table 37 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 38 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 39 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 8 according to Example 8. Table 40 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 8 according to Example 8.

[0198] The zoom lens 8 of Example 8 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having negative refractive power, and a fourth lens group GR4 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0199] In the zoom lens 8 according to Example 8, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the third lens group GR3 corresponds to the second negative lens group described above.

[0200] The zoom lens 8 according to Example 8 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fourth lens group GR4 remain stationary during zooming. When focusing from infinity to a close object, the third lens group GR3 moves toward the object along the optical axis.

[0201] The first lens group GR1 consists of, in order from the object side to the image side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with an aspherical surface on the image side and a convex surface facing the object side. Lens L13 is a negative biconcave lens. Lens L14 is a positive meniscus lens with a convex surface facing the object side.

[0202] The second lens group GR2 consists of, in order from the object side to the image plane side, lenses L21 and L22, an aperture stop St, and lenses L23 to L25. The lens L21 is a positive meniscus lens with its convex surface facing the object side. The lens L22 is a positive biconvex lens. The lens L23 is a negative meniscus lens with its convex surface facing the object side. The lens L24 is a positive biconvex lens. The lenses L23 and L24 form a cemented lens. The lens L25 is a positive biconvex lens.

[0203] The third lens group GR3 is made up of a lens L31, which is a biconcave negative lens having aspherical surfaces on both sides.

[0204] The fourth lens group GR4 is made up of a lens L41, which is a positive meniscus lens with its convex surface facing the object side.

[0205] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0206] [Table 36]

[0207] [Table 37]

[0208] [Table 38]

[0209] [Table 39]

[0210] [Table 40]

[0211] FIG. 93 shows longitudinal aberration of the zoom lens 8 according to Example 8 at the wide-angle end when focusing on infinity. FIG. 94 shows longitudinal aberration of the zoom lens 8 according to Example 8 at an intermediate position when focusing on infinity. FIG. 95 shows longitudinal aberration of the zoom lens 8 according to Example 8 at the telephoto end when focusing on infinity. FIG. 96 shows longitudinal aberration of the zoom lens 8 according to Example 8 at the wide-angle end when focusing on a close distance. FIG. 97 shows longitudinal aberration of the zoom lens 8 according to Example 8 at an intermediate position when focusing on a close distance. FIG. 98 shows longitudinal aberration of the zoom lens 8 according to Example 8 at the telephoto end when focusing on a close distance. FIG. 99 shows lateral aberration of the zoom lens 8 according to Example 8 at the wide-angle end when focusing on infinity. FIG. 100 shows lateral aberration of the zoom lens 8 according to Example 8 at an intermediate position when focusing on infinity. FIG. 101 shows lateral aberration of the zoom lens 8 according to Example 8 at the telephoto end when focusing on infinity. Fig. 102 shows the lateral aberration of the zoom lens 8 according to Example 8 at the wide-angle end and when focusing on a close distance. Fig. 103 shows the lateral aberration of the zoom lens 8 according to Example 8 at the intermediate position and when focusing on a close distance. Fig. 104 shows the lateral aberration of the zoom lens 8 according to Example 8 at the telephoto end and when focusing on a close distance.

[0212] As can be seen from each aberration diagram, the zoom lens 8 according to Example 8 has excellent correction of various aberrations and has excellent imaging performance.

[0213] [Example 9] Table 41 shows basic lens data for the zoom lens 9 according to Example 9 shown in FIG. 105. Table 42 shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 9 according to Example 9. Table 43 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 9 according to Example 9. Table 42 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 43 also shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 44 shows values ​​of coefficients representing the shape of the aspherical surfaces for the zoom lens 9 according to Example 9. Table 45 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 9 according to Example 9.

[0214] The zoom lens 9 according to Example 9 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having negative refractive power, and a fourth lens group GR4 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0215] In the zoom lens 9 according to Example 9, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the third lens group GR3 corresponds to the second negative lens group described above.

[0216] The zoom lens 9 according to Example 9 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fourth lens group GR4 remain stationary during zooming. When focusing from infinity to a close object distance, the third lens group GR3 moves toward the object along the optical axis.

[0217] The first lens group GR1 consists of, in order from the object side to the image side, lenses L11 to L13. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with an aspherical surface on the image side and a convex surface facing the object side. Lens L13 is a positive meniscus lens with a convex surface facing the object side.

[0218] The second lens group GR2 consists of, in order from the object side to the image plane side, lenses L21 and L22, an aperture stop St, and lenses L23 to L25. The lens L21 is a positive meniscus lens with a convex surface facing the object side. The lens L22 is a positive meniscus lens with a concave surface facing the object side. The lens L23 is a negative meniscus lens with a convex surface facing the object side. The lens L24 is a positive biconvex lens. The lenses L23 and L24 form a cemented lens. The lens L25 is a positive biconvex lens.

[0219] The third lens group GR3 is made up of a lens L31, which is a biconcave negative lens having aspherical surfaces on both sides.

[0220] The fourth lens group GR4 is made up of a lens L41, which is a positive biconvex lens.

[0221] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0222] [Table 41]

[0223] [Table 42]

[0224] [Table 43]

[0225] [Table 44]

[0226] [Table 45]

[0227] FIG. 106 shows longitudinal aberration of the zoom lens 9 according to Example 9 at the wide-angle end when focusing on infinity. FIG. 107 shows longitudinal aberration of the zoom lens 9 according to Example 9 at an intermediate position when focusing on infinity. FIG. 108 shows longitudinal aberration of the zoom lens 9 according to Example 9 at the telephoto end when focusing on infinity. FIG. 109 shows longitudinal aberration of the zoom lens 9 according to Example 9 at the wide-angle end when focusing on a close distance. FIG. 110 shows longitudinal aberration of the zoom lens 9 according to Example 9 at an intermediate position when focusing on a close distance. FIG. 111 shows longitudinal aberration of the zoom lens 9 according to Example 9 at the telephoto end when focusing on a close distance. FIG. 112 shows lateral aberration of the zoom lens 9 according to Example 9 at the wide-angle end when focusing on infinity. FIG. 113 shows lateral aberration of the zoom lens 9 according to Example 9 at an intermediate position when focusing on infinity. Fig. 114 shows the lateral aberration of the zoom lens 9 according to Example 9 at the telephoto end when focusing on infinity. Fig. 115 shows the lateral aberration of the zoom lens 9 according to Example 9 at the wide-angle end when focusing on a close distance. Fig. 116 shows the lateral aberration of the zoom lens 9 according to Example 9 at an intermediate position when focusing on a close distance. Fig. 117 shows the lateral aberration of the zoom lens 9 according to Example 9 at the telephoto end when focusing on a close distance.

[0228] As can be seen from each aberration diagram, the zoom lens 9 according to Example 9 has excellent correction of various aberrations and has excellent imaging performance.

[0229] [Example 10] Table 46 shows basic lens data for the zoom lens 10 according to Example 10 shown in FIG. 118. Table 47 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 10 according to Example 10. Table 48 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 10 according to Example 10. Table 47 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 48 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 49 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 10 according to Example 10. Table 50 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 10 according to the tenth embodiment.

[0230] The zoom lens 10 of Example 10 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0231] In the zoom lens 10 of Example 10, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0232] The zoom lens 10 according to Example 10 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close distance, the third lens group GR3 moves toward the object along the optical axis.

[0233] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L15. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with aspherical surfaces on both sides and with a convex surface facing the object side. Lens L13 is a positive meniscus lens with a convex surface facing the object side. Lens L14 is a negative lens with a biconcave shape. Lens L15 is a positive meniscus lens with a convex surface facing the object side. Lenses L14 and L15 form a cemented lens.

[0234] The second lens group GR2 is composed of, in order from the object side to the image side, lens L21, aperture stop St, and lenses L23 to L26. Lens L21 is a positive meniscus lens with a convex surface facing the object side. Lens L22 is a positive biconvex lens. Lens L23 is a negative meniscus lens with a concave surface facing the object side. Lenses L22 and L23 form a cemented lens. Lens L24 is a positive meniscus lens with aspherical surfaces on both sides and with a concave surface facing the object side. Lens L25 is a positive meniscus lens with a concave surface facing the object side. Lens L26 is a negative meniscus lens with a concave surface facing the object side. Lenses L25 and L26 form a cemented lens.

[0235] The third lens group GR3 consists of, in order from the object side to the image side, lens L31 and lens L32. Lens L31 is a negative meniscus lens with its concave surface facing the object side. Lens L32 is a positive meniscus lens with its concave surface facing the object side and aspherical on both sides.

[0236] The fourth lens group GR4 is made up of a lens L41, which is a negative meniscus lens with a convex surface facing the object side.

[0237] The fifth lens group GR5 is made up of a lens L51, which is a positive biconvex lens.

[0238] The above configuration realizes a compact, wide-angle zoom lens that can perform good aberration correction while achieving a reduction in the weight of the lens group that moves during zooming.

[0239] Table 46

[0240] Table 47

[0241] Table 48

[0242] Table 49

[0243] Table 50

[0244] FIG. 119 shows longitudinal aberration of the zoom lens 10 according to Example 10 at the wide-angle end when focusing on infinity. FIG. 120 shows longitudinal aberration of the zoom lens 10 according to Example 10 at an intermediate position when focusing on infinity. FIG. 121 shows longitudinal aberration of the zoom lens 10 according to Example 10 at the telephoto end when focusing on infinity. FIG. 122 shows longitudinal aberration of the zoom lens 10 according to Example 10 at the wide-angle end when focusing on a close distance. FIG. 123 shows longitudinal aberration of the zoom lens 10 according to Example 10 at an intermediate position when focusing on a close distance. FIG. 124 shows longitudinal aberration of the zoom lens 10 according to Example 10 at the telephoto end when focusing on a close distance. FIG. 125 shows lateral aberration of the zoom lens 10 according to Example 10 at the wide-angle end when focusing on infinity. FIG. 126 shows lateral aberration of the zoom lens 10 according to Example 10 at an intermediate position when focusing on infinity. Fig. 127 shows the lateral aberration of the zoom lens 10 according to Example 10 at the telephoto end and when focusing on infinity. Fig. 128 shows the lateral aberration of the zoom lens 10 according to Example 10 at the wide-angle end and when focusing on a close distance. Fig. 129 shows the lateral aberration of the zoom lens 10 according to Example 10 at the intermediate position and when focusing on a close distance. Fig. 130 shows the lateral aberration of the zoom lens 10 according to Example 10 at the telephoto end and when focusing on a close distance.

[0245] As can be seen from each aberration diagram, the zoom lens 10 according to Example 10 has excellent correction of various aberrations and has excellent imaging performance.

[0246] [Example 11] Table 51 shows basic lens data for the zoom lens 11 according to Example 11 shown in FIG. 131. Table 52 shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 11 according to Example 11. Table 53 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 11 according to Example 11. Table 52 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 53 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 54 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 11 according to Example 11. Table 55 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 11 according to Example 11.

[0247] The zoom lens 11 of Example 11 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having positive refractive power, a fourth lens group GR4 having negative refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0248] In the zoom lens 11 of Example 11, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the fourth lens group GR4 corresponds to the second negative lens group described above.

[0249] The zoom lens 11 according to Example 11 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close object distance, the fourth lens group GR4 moves toward the object along the optical axis.

[0250] The first lens group GR1 is composed of, in order from the object side to the image side, lenses L11 to L15. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with an aspherical surface on the image side and a convex surface facing the object side. Lens L13 is a negative biconcave lens. Lens L14 is a positive biconvex lens. Lenses L13 and L14 form a cemented lens.

[0251] The second lens group GR2 consists of, in order from the object side to the image plane side, an aperture stop St and lenses L21 to L23. Lens L21 is a positive biconvex lens. Lens L22 is a negative meniscus lens with its concave surface facing the object side. Lenses L21 and L22 form a cemented lens. Lens L23 is a negative meniscus lens with its concave surface facing the object side.

[0252] The third lens group GR3 is made up of a lens L31, which is a biconvex positive lens having aspherical surfaces on both sides.

[0253] The fourth lens group GR4 is composed of, in order from the object side to the image side, lenses L41 to L43. Lens L41 is a negative meniscus lens with aspherical surfaces on both sides, with the concave surface facing the object side. Lens L42 is a negative biconcave lens. Lens L43 is a positive biconvex lens with an aspherical surface on the image side. Lenses L42 and L43 form a cemented lens.

[0254] The fifth lens group GR5 is made up of a lens L51, which is a positive biconvex lens.

[0255] The above-mentioned configuration realizes a compact, wide-angle zoom lens that can effectively correct aberrations while reducing the weight of the lens groups that move during zooming. Furthermore, as can be seen from the various aberration diagrams, various aberrations are effectively corrected, resulting in excellent imaging performance.

[0256] [Table 51]

[0257] [Table 52]

[0258] [Table 53]

[0259] [Table 54]

[0260] [Table 55]

[0261] FIG. 132 shows longitudinal aberration of the zoom lens 11 according to Example 11 at the wide-angle end when focusing on infinity. FIG. 133 shows longitudinal aberration of the zoom lens 11 according to Example 11 at the intermediate position when focusing on infinity. FIG. 134 shows longitudinal aberration of the zoom lens 11 according to Example 11 at the telephoto end when focusing on infinity. FIG. 135 shows longitudinal aberration of the zoom lens 11 according to Example 11 at the wide-angle end when focusing on a close distance. FIG. 136 shows longitudinal aberration of the zoom lens 11 according to Example 11 at the intermediate position when focusing on a close distance. FIG. 137 shows longitudinal aberration of the zoom lens 11 according to Example 11 at the telephoto end when focusing on a close distance. FIG. 138 shows lateral aberration of the zoom lens 11 according to Example 11 at the wide-angle end when focusing on infinity. FIG. 139 shows lateral aberration of the zoom lens 11 according to Example 11 at the intermediate position when focusing on infinity. Fig. 140 shows the lateral aberration of the zoom lens 11 according to Example 11 at the telephoto end when focusing on infinity. Fig. 141 shows the lateral aberration of the zoom lens 11 according to Example 11 at the wide-angle end when focusing on a close distance. Fig. 142 shows the lateral aberration of the zoom lens 11 according to Example 11 at the intermediate position when focusing on a close distance. Fig. 143 shows the lateral aberration of the zoom lens 11 according to Example 11 at the telephoto end when focusing on a close distance.

[0262] As can be seen from each aberration diagram, the zoom lens 11 according to Example 11 has excellent correction of various aberrations and has excellent imaging performance.

[0263] [Example 12] Table 56 shows basic lens data for the zoom lens 12 according to Example 12 shown in Figure 144. Table 57 shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system for the zoom lens 12 according to Example 12. Table 58 shows data on surface spacings that are variable during zooming and focusing for the zoom lens 12 according to Example 12. Table 57 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity. Table 58 shows values ​​for the wide-angle end (Wide), the middle position (Mid), and the telephoto end (Tele) when the object distance (d0) is infinity and when it is close. Table 59 shows values ​​of coefficients representing the shape of the aspherical surface for the zoom lens 12 according to Example 12. Table 60 shows the initial surface and focal length (unit: mm) of each lens group of the zoom lens 12 according to Example 12.

[0264] The zoom lens 12 of Example 12 is configured to include a first lens group GR1 having negative refractive power, a second lens group GR2 including an aperture stop St and having positive refractive power, a third lens group GR3 having negative refractive power, a fourth lens group GR4 having positive refractive power, and a fifth lens group GR5 having positive refractive power, which are arranged in this order from the object side to the image plane side.

[0265] In the zoom lens 12 according to Example 12, the first lens group GR1 corresponds to the first negative lens group described above, the second lens group GR2 corresponds to the positive lens group GRs described above, and the third lens group GR3 corresponds to the second negative lens group described above.

[0266] The zoom lens 12 according to Example 12 moves during zooming so that the spacing between adjacent lens groups changes. The first lens group GR1 and the fifth lens group GR5 remain stationary during zooming. When focusing from infinity to a close distance, the third lens group GR3 moves toward the object along the optical axis.

[0267] The first lens group GR1 is composed of, in order from the object side to the image plane side, lenses L11 to L14. Lens L11 is a negative meniscus lens with a convex surface facing the object side. Lens L12 is a negative meniscus lens with a convex surface facing the object side and aspherical surfaces on both sides. Lens L13 is a negative biconcave lens with aspherical surfaces on both sides. Lens L14 is a positive biconvex lens.

[0268] The second lens group GR2 consists of, in order from the object side to the image plane side, an aperture stop St and lenses L21 to L25. Lens L21 is a positive meniscus lens with its convex surface facing the object side. Lens L22 is a positive biconvex lens. Lens L23 is a positive meniscus lens with its concave surface facing the object side. Lens L24 is a negative biconcave lens with aspherical surfaces on both sides. Lens L25 is a positive biconvex lens.

[0269] The third lens group GR3 consists of, in order from the object side to the image side, lens L31 and lens L32. Lens L31 is a positive meniscus lens with its concave surface facing the object side. Lens L32 is a negative biconcave lens with aspherical surfaces on both sides.

[0270] The fourth lens group GR4 is made up of a lens L41, which is a positive biconvex lens.

[0271] The fifth lens group GR5 consists of, in order from the object side to the image side, a lens L51 and a lens L52. The lens L51 is a negative meniscus lens with its concave surface facing the object side. The lens L52 is a positive meniscus lens with its concave surface facing the object side. The lenses L51 and L52 form a cemented lens.

[0272] The above-mentioned configuration realizes a compact, wide-angle zoom lens that can effectively correct aberrations while reducing the weight of the lens groups that move during zooming. Furthermore, as can be seen from the various aberration diagrams, various aberrations are effectively corrected, resulting in excellent imaging performance.

[0273] [Table 56]

[0274] [Table 57]

[0275] [Table 58]

[0276] [Table 59]

[0277] [Table 60]

[0278] FIG. 145 shows longitudinal aberration of the zoom lens 12 according to Example 12 at the wide-angle end when focusing on infinity. FIG. 146 shows longitudinal aberration of the zoom lens 12 according to Example 12 at the intermediate position when focusing on infinity. FIG. 147 shows longitudinal aberration of the zoom lens 12 according to Example 12 at the telephoto end when focusing on infinity. FIG. 148 shows longitudinal aberration of the zoom lens 12 according to Example 12 at the wide-angle end when focusing on a close distance. FIG. 149 shows longitudinal aberration of the zoom lens 12 according to Example 12 at the intermediate position when focusing on a close distance. FIG. 150 shows longitudinal aberration of the zoom lens 12 according to Example 12 at the telephoto end when focusing on a close distance. FIG. 151 shows lateral aberration of the zoom lens 12 according to Example 12 at the wide-angle end when focusing on infinity. FIG. 152 shows lateral aberration of the zoom lens 12 according to Example 12 at the intermediate position when focusing on infinity. Fig. 153 shows the lateral aberration of the zoom lens 12 according to Example 12 at the telephoto end and when focusing on infinity. Fig. 154 shows the lateral aberration of the zoom lens 12 according to Example 12 at the wide-angle end and when focusing on a close distance. Fig. 155 shows the lateral aberration of the zoom lens 12 according to Example 12 at an intermediate position and when focusing on a close distance. Fig. 156 shows the lateral aberration of the zoom lens 12 according to Example 12 at the telephoto end and when focusing on a close distance.

[0279] As can be seen from each aberration diagram, the zoom lens 12 according to Example 12 has excellent correction of various aberrations and has excellent imaging performance.

[0280] [Other numerical data for each example] Tables 61 to 64 show the values ​​for each of the above conditional expressions for each example. As can be seen from Tables 61 to 64, the values ​​for each example for conditional expressions (1) to (8) are within the corresponding numerical ranges.

[0281] [Table 61]

[0282] [Table 62]

[0283] [Table 63]

[0284] [Table 64]

[0285] <5. Application Examples> [5.1 First application example] The technology according to the present disclosure can be applied to various products. For example, the technology according to the present disclosure may be realized as a device mounted on any type of moving body, such as an automobile, an electric vehicle, a hybrid electric vehicle, a motorcycle, a bicycle, a personal mobility device, an airplane, a drone, a ship, a robot, a construction machine, or an agricultural machine (tractor).

[0286] Fig. 158 is a block diagram showing a schematic configuration example of a vehicle control system 7000, which is an example of a mobile object control system to which the technology according to the present disclosure can be applied. The vehicle control system 7000 includes a plurality of electronic control units connected via a communication network 7010. In the example shown in Fig. 158, the vehicle control system 7000 includes a drive system control unit 7100, a body system control unit 7200, a battery control unit 7300, an outside-vehicle information detection unit 7400, an inside-vehicle information detection unit 7500, and an integrated control unit 7600. The communication network 7010 connecting these multiple control units may be an in-vehicle communication network conforming to any standard, such as a Controller Area Network (CAN), a Local Interconnect Network (LIN), a Local Area Network (LAN), or FlexRay (registered trademark).

[0287] Each control unit includes a microcomputer that performs arithmetic processing according to various programs, a memory unit that stores the programs executed by the microcomputer or parameters used in various calculations, and a drive circuit that drives various devices to be controlled. Each control unit includes a network I / F for communicating with other control units via a communication network 7010, and a communication I / F for communicating with devices or sensors inside and outside the vehicle via wired or wireless communication. FIG. 158 illustrates the functional configuration of the integrated control unit 7600, including a microcomputer 7610, a general-purpose communication I / F 7620, a dedicated communication I / F 7630, a positioning unit 7640, a beacon receiving unit 7650, an in-vehicle device I / F 7660, an audio / video output unit 7670, an in-vehicle network I / F 7680, and a memory unit 7690. Similarly, the other control units also include a microcomputer, a communication I / F, a memory unit, and the like.

[0288] The drivetrain control unit 7100 controls the operation of devices related to the drivetrain of the vehicle in accordance with various programs. For example, the drivetrain control unit 7100 functions as a control device for a driving force generating device for generating driving force for the vehicle, such as an internal combustion engine or a drive motor, a driving force transmission mechanism for transmitting driving force to the wheels, a steering mechanism for adjusting the steering angle of the vehicle, and a braking device for generating braking force for the vehicle. The drivetrain control unit 7100 may also function as a control device for an ABS (Antilock Brake System) or an ESC (Electronic Stability Control), etc.

[0289] A vehicle state detection unit 7110 is connected to the drivetrain control unit 7100. The vehicle state detection unit 7110 includes at least one of a gyro sensor that detects the angular velocity of the axial rotational motion of the vehicle body, an acceleration sensor that detects the acceleration of the vehicle, or a sensor that detects the amount of operation of the accelerator pedal, the amount of operation of the brake pedal, the steering angle of the steering wheel, the engine rotation speed, the rotation speed of the wheels, etc. The drivetrain control unit 7100 performs arithmetic processing using signals input from the vehicle state detection unit 7110, and controls the internal combustion engine, the drive motor, the electric power steering device, the brake device, etc.

[0290] Body system control unit 7200 controls the operation of various devices mounted on the vehicle body in accordance with various programs. For example, body system control unit 7200 functions as a control device for a keyless entry system, a smart key system, a power window device, or various lamps such as head lamps, backup lamps, brake lamps, turn signals, and fog lamps. In this case, radio waves transmitted from a portable device that serves as a key or signals from various switches may be input to body system control unit 7200. Body system control unit 7200 receives these radio waves or signals and controls the vehicle's door lock device, power window device, lamps, etc.

[0291] The battery control unit 7300 controls the secondary battery 7310, which is the power supply source for the drive motor, in accordance with various programs. For example, information such as battery temperature, battery output voltage, or remaining battery capacity is input to the battery control unit 7300 from a battery device equipped with the secondary battery 7310. The battery control unit 7300 performs arithmetic processing using these signals, and controls the temperature regulation of the secondary battery 7310 or a cooling device or the like provided in the battery device.

[0292] The outside vehicle information detection unit 7400 detects information outside the vehicle equipped with the vehicle control system 7000. For example, at least one of an imaging unit 7410 and an outside vehicle information detection unit 7420 is connected to the outside vehicle information detection unit 7400. The imaging unit 7410 includes at least one of a ToF (Time Of Flight) camera, a stereo camera, a monocular camera, an infrared camera, and other cameras. The outside vehicle information detection unit 7420 includes at least one of an environmental sensor for detecting the current weather or climate, or a surrounding information detection sensor for detecting other vehicles, obstacles, pedestrians, etc. around the vehicle equipped with the vehicle control system 7000.

[0293] The environmental sensor may be, for example, at least one of a raindrop sensor that detects rain, a fog sensor that detects fog, a sunshine sensor that detects the degree of sunshine, and a snow sensor that detects snowfall. The surrounding information detection sensor may be at least one of an ultrasonic sensor, a radar device, and a LIDAR (Light Detection and Ranging, Laser Imaging Detection and Ranging) device. The imaging unit 7410 and the outside vehicle information detection unit 7420 may each be provided as an independent sensor or device, or may be provided as a device in which multiple sensors or devices are integrated.

[0294] Here, FIG. 159 shows an example of the installation positions of the imaging unit 7410 and the vehicle exterior information detection unit 7420. The imaging units 7910, 7912, 7914, 7916, and 7918 are provided, for example, at least one of the front nose, side mirrors, rear bumper, back door, and upper part of the windshield inside the vehicle cabin of the vehicle 7900. The imaging unit 7910 provided on the front nose and the imaging unit 7918 provided on the upper part of the windshield inside the vehicle cabin mainly acquire images of the front of the vehicle 7900. The imaging units 7912 and 7914 provided on the side mirrors mainly acquire images of the sides of the vehicle 7900. The imaging unit 7916 provided on the rear bumper or back door mainly acquires images of the rear of the vehicle 7900. The imaging unit 7918 provided on the upper part of the windshield inside the vehicle cabin is mainly used to detect leading vehicles, pedestrians, obstacles, traffic lights, traffic signs, lanes, etc.

[0295] 159 shows an example of the imaging ranges of the imaging units 7910, 7912, 7914, and 7916. Imaging range a indicates the imaging range of the imaging unit 7910 provided on the front nose, imaging ranges b and c indicate the imaging ranges of the imaging units 7912 and 7914 provided on the side mirrors, respectively, and imaging range d indicates the imaging range of the imaging unit 7916 provided on the rear bumper or back door. For example, by overlaying the image data captured by the imaging units 7910, 7912, 7914, and 7916, a bird's-eye view image of the vehicle 7900 viewed from above can be obtained.

[0296] The vehicle exterior information detection units 7920, 7922, 7924, 7926, 7928, and 7930 provided on the front, rear, sides, and corners of the vehicle 7900 and above the windshield inside the vehicle cabin may be, for example, ultrasonic sensors or radar devices. The vehicle exterior information detection units 7920, 7926, and 7930 provided on the front nose, rear bumper, back door, and above the windshield inside the vehicle cabin of the vehicle 7900 may be, for example, LIDAR devices. These vehicle exterior information detection units 7920 to 7930 are mainly used to detect preceding vehicles, pedestrians, obstacles, etc.

[0297] Returning to FIG. 158 , the explanation will be continued. The outside-vehicle information detection unit 7400 causes the imaging unit 7410 to capture an image outside the vehicle and receives the captured image data. The outside-vehicle information detection unit 7400 also receives detection information from the connected outside-vehicle information detection unit 7420. If the outside-vehicle information detection unit 7420 is an ultrasonic sensor, a radar device, or a LIDAR device, the outside-vehicle information detection unit 7400 emits ultrasonic waves or electromagnetic waves and receives information on the received reflected waves. The outside-vehicle information detection unit 7400 may perform object detection processing or distance detection processing for people, cars, obstacles, signs, text on the road, etc. based on the received information. The outside-vehicle information detection unit 7400 may also perform environment recognition processing for recognizing rainfall, fog, road conditions, etc. based on the received information. The outside-vehicle information detection unit 7400 may also calculate the distance to an object outside the vehicle based on the received information.

[0298] The outside vehicle information detection unit 7400 may also perform image recognition processing or distance detection processing to recognize people, vehicles, obstacles, signs, characters on the road, etc., based on the received image data. The outside vehicle information detection unit 7400 may perform processing such as distortion correction or alignment on the received image data, and may also generate an overhead image or a panoramic image by combining image data captured by different image capturing units 7410. The outside vehicle information detection unit 7400 may also perform viewpoint conversion processing using image data captured by different image capturing units 7410.

[0299] The interior information detection unit 7500 detects information inside the vehicle. A driver state detection unit 7510 that detects the state of the driver is connected to the interior information detection unit 7500, for example. The driver state detection unit 7510 may include a camera that captures an image of the driver, a biosensor that detects the driver's biometric information, or a microphone that collects sound from within the vehicle cabin. The biosensor is provided, for example, on the seat or steering wheel, and detects the biometric information of a passenger sitting in the seat or the driver gripping the steering wheel. The interior information detection unit 7500 may calculate the driver's level of fatigue or concentration, or determine whether the driver is dozing, based on the detection information input from the driver state detection unit 7510. The interior information detection unit 7500 may perform processing such as noise canceling on the collected audio signal.

[0300] The integrated control unit 7600 controls the overall operation of the vehicle control system 7000 in accordance with various programs. An input unit 7800 is connected to the integrated control unit 7600. The input unit 7800 may be implemented by a device that can be operated by a passenger, such as a touch panel, a button, a microphone, a switch, or a lever. Data obtained by voice recognition of a voice input through a microphone may be input to the integrated control unit 7600. The input unit 7800 may be, for example, a remote control device using infrared or other radio waves, or an externally connected device such as a mobile phone or a personal digital assistant (PDA) that can operate the vehicle control system 7000. The input unit 7800 may be, for example, a camera, in which case the passenger can input information by gestures. Alternatively, data obtained by detecting the movement of a wearable device worn by the passenger may be input. Furthermore, the input unit 7800 may include, for example, an input control circuit that generates an input signal based on information input by the passenger or the like using the input unit 7800 and outputs the input signal to the integrated control unit 7600. By operating this input unit 7800, passengers and the like input various data to the vehicle control system 7000 and instruct processing operations.

[0301] The storage unit 7690 may include a ROM (Read Only Memory) that stores various programs executed by the microcomputer, and a RAM (Random Access Memory) that stores various parameters, calculation results, sensor values, etc. The storage unit 7690 may also be realized by a magnetic storage device such as an HDD (Hard Disc Drive), a semiconductor storage device, an optical storage device, a magneto-optical storage device, or the like.

[0302] The general-purpose communication I / F 7620 is a general-purpose communication I / F that mediates communication between various devices present in the external environment 7750. The general-purpose communication I / F 7620 may implement a cellular communication protocol such as GSM (Global System of Mobile communications), WiMAX (registered trademark), LTE (Long Term Evolution), or LTE-Advanced (LTE-A), or other wireless communication protocols such as wireless LAN (also referred to as Wi-Fi (registered trademark)) or Bluetooth (registered trademark). The general-purpose communication I / F 7620 may connect to devices (e.g., application servers or control servers) present on an external network (e.g., the Internet, a cloud network, or an operator-specific network) via, for example, a base station or an access point. The general-purpose communication I / F 7620 may also connect to terminals present near the vehicle (e.g., terminals of drivers, pedestrians, or stores, or machine-type communication (MTC) terminals) using, for example, P2P (Peer to Peer) technology.

[0303] The dedicated communication I / F 7630 is a communication I / F that supports a communication protocol designed for use in vehicles. The dedicated communication I / F 7630 may implement a standard protocol such as WAVE (Wireless Access in Vehicle Environment), which is a combination of a lower layer IEEE802.11p and an upper layer IEEE1609, a dedicated short range communications (DSRC), or a cellular communication protocol. The dedicated communication I / F 7630 typically performs V2X communication, which is a concept including one or more of vehicle-to-vehicle communication, vehicle-to-infrastructure communication, vehicle-to-home communication, and vehicle-to-pedestrian communication.

[0304] The positioning unit 7640 performs positioning by receiving, for example, GNSS signals from GNSS (Global Navigation Satellite System) satellites (for example, GPS signals from GPS (Global Positioning System) satellites), and generates position information including the latitude, longitude, and altitude of the vehicle. Note that the positioning unit 7640 may identify the current position by exchanging signals with a wireless access point, or may obtain position information from a terminal such as a mobile phone, PHS, or smartphone that has a positioning function.

[0305] The beacon receiver 7650 receives, for example, radio waves or electromagnetic waves transmitted from radio stations or the like installed on the road, and acquires information such as the current location, congestion, road closures, required travel time, etc. The function of the beacon receiver 7650 may be included in the dedicated communication I / F 7630 described above.

[0306] The in-vehicle device I / F 7660 is a communication interface that mediates connections between the microcomputer 7610 and various in-vehicle devices 7760 present in the vehicle. The in-vehicle device I / F 7660 may establish a wireless connection using a wireless communication protocol such as wireless LAN, Bluetooth (registered trademark), NFC (Near Field Communication), or WUSB (Wireless USB). The in-vehicle device I / F 7660 may also establish a wired connection such as USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface), or MHL (Mobile High-Definition Link) via a connection terminal (and a cable, if necessary) not shown. The in-vehicle device 7760 may include, for example, at least one of a mobile device or a wearable device owned by a passenger, or an information device carried or installed in the vehicle. The in-vehicle device 7760 may also include a navigation device that searches for a route to a desired destination. The in-vehicle device I / F 7660 exchanges control signals or data signals with these in-vehicle devices 7760 .

[0307] The in-vehicle network I / F 7680 is an interface that mediates communication between the microcomputer 7610 and the communication network 7010. The in-vehicle network I / F 7680 transmits and receives signals in accordance with a predetermined protocol supported by the communication network 7010.

[0308] The microcomputer 7610 of the integrated control unit 7600 controls the vehicle control system 7000 in accordance with various programs based on information acquired via at least one of the general-purpose communication I / F 7620, the dedicated communication I / F 7630, the positioning unit 7640, the beacon receiving unit 7650, the in-vehicle device I / F 7660, and the in-vehicle network I / F 7680. For example, the microcomputer 7610 may calculate control target values ​​for the driving force generating device, the steering mechanism, or the braking device based on acquired information inside and outside the vehicle, and output control commands to the drivetrain control unit 7100. For example, the microcomputer 7610 may perform cooperative control aimed at realizing functions of an Advanced Driver Assistance System (ADAS), including vehicle collision avoidance or impact mitigation, following driving based on the following distance, vehicle speed maintenance driving, vehicle collision warning, vehicle lane departure warning, etc. In addition, the microcomputer 7610 may perform cooperative control for the purpose of autonomous driving, in which the vehicle travels autonomously without relying on driver operation, by controlling a driving force generating device, a steering mechanism, a braking device, etc. based on information acquired about the vehicle's surroundings.

[0309] The microcomputer 7610 may generate three-dimensional distance information between the vehicle and objects such as surrounding structures and people, and create local map information including information about the vicinity of the vehicle's current location, based on information acquired via at least one of the general-purpose communication I / F 7620, the dedicated communication I / F 7630, the positioning unit 7640, the beacon receiving unit 7650, the in-vehicle device I / F 7660, and the in-vehicle network I / F 7680. Furthermore, the microcomputer 7610 may predict dangers, such as a vehicle collision, the approach of a pedestrian, or entry into a closed road, based on the acquired information, and generate a warning signal. The warning signal may be, for example, a signal for generating a warning sound or turning on a warning lamp.

[0310] The audio / video output unit 7670 transmits at least one of audio and image output signals to an output device capable of visually or audibly notifying vehicle occupants or the outside of the vehicle of information. In the example of FIG. 158, an audio speaker 7710, a display unit 7720, and an instrument panel 7730 are illustrated as output devices. The display unit 7720 may include, for example, at least one of an on-board display and a head-up display. The display unit 7720 may have an AR (Augmented Reality) display function. The output device may be other devices besides these devices, such as headphones, a wearable device such as an eyeglass-type display worn by the occupant, a projector, or a lamp. When the output device is a display device, the display device visually displays results obtained by various processes performed by the microcomputer 7610 or information received from other control units in various formats, such as text, images, tables, and graphs. When the output device is an audio output device, the audio output device converts audio signals consisting of reproduced audio data or acoustic data into analog signals and audibly outputs the analog signals.

[0311] In the example shown in FIG. 158, at least two control units connected via the communication network 7010 may be integrated into one control unit. Alternatively, each control unit may be composed of multiple control units. Furthermore, the vehicle control system 7000 may include another control unit not shown. In the above description, some or all of the functions performed by one control unit may be performed by another control unit. In other words, as long as information is transmitted and received via the communication network 7010, predetermined arithmetic processing may be performed by one of the control units. Similarly, a sensor or device connected to one control unit may be connected to another control unit, and multiple control units may transmit and receive detection information to and from each other via the communication network 7010.

[0312] In the vehicle control system 7000 described above, the zoom lens and imaging device of the present disclosure can be applied to the imaging unit 7410 and the imaging units 7910, 7912, 7914, 7916, and 7918.

[0313] [5.2 Second application example] The technology disclosed herein can be applied to a medical imaging system, which is a medical system that uses imaging technology, such as an endoscope system or a microscope system.

[0314] [Endoscope system] An example of an endoscopic system will be described with reference to FIGS. 160 and 161. FIG. 160 is a diagram illustrating an example of a schematic configuration of an endoscopic system 5000 to which the technology according to the present disclosure can be applied. FIG. 161 is a diagram illustrating an example of the configuration of an endoscope 5001 and a CCU (Camera Control Unit) 5039. FIG. 160 illustrates a state in which an operator (e.g., a doctor) 5067, who is a surgical participant, is performing surgery on a patient 5071 on a patient bed 5069 using the endoscopic system 5000. As shown in FIG. 160, the endoscopic system 5000 includes an endoscope 5001, which is a medical imaging device, a CCU 5039, a light source device 5043, a recording device 5053, an output device 5055, and a support device 5027 that supports the endoscope 5001.

[0315] In endoscopic surgery, an insertion aid called a trocar 5025 is inserted into a patient 5071. Then, a scope 5003 and surgical tools 5021 connected to an endoscope 5001 are inserted into the body of the patient 5071 via the trocar 5025. The surgical tools 5021 are, for example, energy devices such as an electric scalpel, forceps, etc.

[0316] A surgical image, which is a medical image showing the inside of the body of a patient 5071 photographed by an endoscope 5001, is displayed on a display device 5041. An operator 5067 performs a procedure on the surgical target using a surgical tool 5021 while viewing the surgical image displayed on the display device 5041. Note that the medical image is not limited to a surgical image, and may be a diagnostic image photographed during a diagnosis.

[0317] [Endoscopy] The endoscope 5001 is an imaging unit that captures images of the inside of the body of a patient 5071. For example, as shown in FIG. 161 , the endoscope 5001 is a camera 5005 that includes a focusing optical system 50051 that focuses incident light, a zoom optical system 50052 that enables optical zoom by changing the focal length of the imaging unit, a focus optical system 50053 that enables focus adjustment by changing the focal length of the imaging unit, and a light-receiving element 50054. The endoscope 5001 generates pixel signals by focusing light onto the light-receiving element 50054 via a connected scope 5003, and outputs the pixel signals to the CCU 5039 via a transmission system. The scope 5003 has an objective lens at its tip and is an insertion section that guides light from a connected light source device 5043 into the body of the patient 5071. The scope 5003 is, for example, a rigid scope if it is a rigid endoscope or a flexible scope if it is a flexible endoscope. The scope 5003 may be a direct endoscope or an oblique endoscope. Furthermore, the pixel signal may be a signal based on a signal output from a pixel, such as a RAW signal or an image signal. A configuration may also be adopted in which a memory is installed in the transmission system connecting the endoscope 5001 and the CCU 5039, and parameters related to the endoscope 5001 and the CCU 5039 are stored in the memory. The memory may be located, for example, at a connection portion of the transmission system or on a cable. For example, parameters at the time of shipment of the endoscope 5001 and parameters that change when power is applied may be stored in the memory of the transmission system, and the operation of the endoscope may be changed based on parameters read from the memory. The endoscope and the transmission system may be collectively referred to as an endoscope. The light receiving element 50054 is a sensor that converts received light into a pixel signal, and is, for example, a CMOS (Complementary Metal Oxide Semiconductor) type imaging element. It is preferable that the light receiving element 50054 be an imaging element capable of color imaging with a Bayer array. Furthermore, the light receiving element 50054 is preferably an imaging element having a number of pixels corresponding to a resolution of, for example, 4K (3840 horizontal pixels × 2160 vertical pixels), 8K (7680 horizontal pixels × 4320 vertical pixels), or square 4K (3840 or more horizontal pixels × 3840 or more vertical pixels). The light receiving element 50054 may be a single sensor chip or multiple sensor chips.For example, a prism may be provided to separate incident light into predetermined wavelength bands, and each wavelength band may be imaged by a different light-receiving element. Alternatively, multiple light-receiving elements may be provided for stereoscopic vision. The light-receiving element 50054 may be a sensor including an image processing circuit within its chip structure, or a Time of Flight (ToF) sensor. The transmission system may be, for example, an optical fiber cable or wireless transmission. Wireless transmission may be performed via any means capable of transmitting pixel signals generated by the endoscope 5001. For example, the endoscope 5001 and the CCU 5039 may be connected wirelessly, or the endoscope 5001 and the CCU 5039 may be connected via a base station in the operating room. In this case, the endoscope 5001 may simultaneously transmit not only pixel signals but also information related to the pixel signals (e.g., pixel signal processing priority, synchronization signal, etc.). The endoscope may be configured such that the scope and camera are integrated, or a light-receiving element is provided at the tip of the scope.

[0318] [CCU (Camera Control Unit)] The CCU 5039 is a control device that comprehensively controls the connected endoscope 5001 and light source device 5043, and is, for example, an information processing device having an FPGA 50391, a CPU 50392, a RAM 50393, a ROM 50394, a GPU 50395, and an I / F 50396, as shown in FIG. 161 . The CCU 5039 may also comprehensively control the connected display device 5041, recording device 5053, and output device 5055. For example, the CCU 5039 controls the irradiation timing, irradiation intensity, and type of irradiation light source of the light source device 5043. The CCU 5039 also performs image processing such as development processing (e.g., demosaic processing) and correction processing on pixel signals output from the endoscope 5001, and outputs the processed pixel signals (e.g., images) to an external device such as the display device 5041. The CCU 5039 also transmits control signals to the endoscope 5001 to control the driving of the endoscope 5001. The control signal is, for example, information regarding imaging conditions such as the magnification and focal length of the imaging unit. The CCU 5039 may have an image down-conversion function and may be configured to be able to simultaneously output a high-resolution (e.g., 4K) image to the display device 5041 and a low-resolution (e.g., HD) image to the recording device 5053.

[0319] The CCU 5039 may also be connected to external devices (e.g., recording devices, display devices, output devices, and support devices) via an IP converter that converts signals into a predetermined communication protocol (e.g., IP (Internet Protocol)). The connection between the IP converter and the external device may be configured as a wired network, or a partial or entire network may be configured as a wireless network. For example, the IP converter on the CCU 5039 side may have a wireless communication function and transmit the received video to an IP switcher or an output-side IP converter via a wireless communication network such as a fifth-generation mobile communication system (5G) or a sixth-generation mobile communication system (6G).

[0320] [Light source device] The light source device 5043 is a device capable of emitting light in a predetermined wavelength band and includes, for example, multiple light sources and a light source optical system that guides the light from the multiple light sources. The light sources are, for example, a xenon lamp, an LED light source, or an LD light source. The light source device 5043 has, for example, LED light sources corresponding to the three primary colors R, G, and B, and emits white light by controlling the output intensity and output timing of each light source. The light source device 5043 may also include a light source that can emit special light used for special light observation, in addition to a light source that emits normal light used for normal light observation. The special light is light in a predetermined wavelength band different from the normal light used for normal light observation, such as near-infrared light (light with a wavelength of 760 nm or more), infrared light, blue light, or ultraviolet light. The normal light is, for example, white light or green light. Narrowband light observation, which is a type of special light observation, alternately emits blue light and green light, allowing high-contrast imaging of specific tissues, such as blood vessels on the surface of mucous membranes, by utilizing the wavelength-dependence of light absorption in body tissue. Furthermore, in fluorescence observation, which is a type of special light observation, excitation light that excites a drug injected into body tissue is irradiated and fluorescence emitted by the body tissue or the drug as a marker is received to obtain a fluorescence image, thereby making it easier for the surgeon to visualize body tissue that is difficult for the surgeon to visualize under normal light. For example, in fluorescence observation using infrared light, infrared light having an excitation wavelength band is irradiated onto a drug such as indocyanine green (ICG) injected into body tissue, and the fluorescence of the drug is received, making it easier to visualize the structure of body tissue and affected areas. Furthermore, in fluorescence observation, a drug (e.g., 5-ALA) that is excited by special light in the blue wavelength band and emits fluorescence in the red wavelength band may be used. The type of irradiated light for the light source device 5043 is set under the control of the CCU 5039. The CCU 5039 may have a mode in which normal light observation and special light observation are alternately performed by controlling the light source device 5043 and the endoscope 5001. In this case, it is preferable that information based on pixel signals obtained under special light observation be superimposed on pixel signals obtained under normal light observation. The special light observation may be infrared observation, which uses infrared light to see deeper than the surface of an organ, or multispectral observation using hyperspectral spectroscopy. Photodynamic therapy may also be combined.

[0321] [Recording Device] The recording device 5053 is a device, such as a recorder, that records pixel signals (e.g., images) acquired from the CCU 5039. The recording device 5053 records images acquired from the CCU 5039 on a HDD, an SDD, or an optical disk. The recording device 5053 may be connected to a network within the hospital so as to be accessible from devices outside the operating room. The recording device 5053 may also have an image down-conversion or up-conversion function.

[0322] [Display device] The display device 5041 is a device capable of displaying an image, such as a display monitor. The display device 5041 displays an image based on pixel signals acquired from the CCU 5039. The display device 5041 may also function as an input device that enables gaze recognition, voice recognition, and instruction input using gestures by including a camera and a microphone.

[0323] [Output device] The output device 5055 is a device, such as a printer, that outputs information acquired from the CCU 5039. The output device 5055 prints, for example, a print image based on the pixel signal acquired from the CCU 5039 onto paper.

[0324] [Support device] The support device 5027 is an articulated arm including a base 5029 having an arm control device 5045, an arm 5031 extending from the base 5029, and a holder 5032 attached to the tip of the arm 5031. The arm control device 5045 is configured with a processor such as a CPU and controls the drive of the arm 5031 by operating according to a predetermined program. The support device 5027 controls the position and posture of the endoscope 5001 held by the holder 5032, for example, by controlling parameters such as the length of each link 5035 constituting the arm 5031 and the rotation angle and torque of each joint 5033 using the arm control device 5045. This allows the endoscope 5001 to be changed to a desired position or posture, allowing the scope 5003 to be inserted into the patient 5071 and the observation area within the body to be changed. The support device 5027 functions as an endoscope support arm that supports the endoscope 5001 during surgery. This allows the support device 5027 to take the place of an assistant scopist who holds the endoscope 5001. The support device 5027 may also be a device that supports a microscope device 5301 (described later) and may also be called a medical support arm. The support device 5027 may be controlled autonomously by the arm control device 5045, or may be controlled by the arm control device 5045 based on user input. For example, the control method may be a master-slave method in which the support device 5027, which serves as a slave device (replica device) serving as a patient cart, is controlled based on the movement of a master device (primary device) that is an operator console located at the user's hand. The support device 5027 may also be remotely controlled from outside the operating room.

[0325] The above describes an example of an endoscope system 5000 to which the technology according to the present disclosure can be applied. For example, the technology according to the present disclosure may be applied to a microscope system.

[0326] [Microscope system] 162 is a diagram showing an example of a schematic configuration of a microsurgical system to which the technology according to the present disclosure can be applied. In the following description, components similar to those in the endoscope system 5000 are assigned the same reference numerals, and redundant description thereof will be omitted.

[0327] 162 shows a schematic diagram of an operator 5067 performing surgery on a patient 5071 on a patient bed 5069 using a microsurgical system 5300. For simplicity, FIG. 162 omits the illustration of the cart 5037 of the microsurgical system 5300 and shows a simplified illustration of a microscope device 5301 that replaces the endoscope 5001. However, the microscope device 5301 in this description may refer to the microscope unit 5303 provided at the tip of the link 5035, or may refer to the entire configuration including the microscope unit 5303 and the support device 5027.

[0328] As shown in Fig. 162, during surgery, a microsurgery system 5300 is used, and an image of the surgical site captured by a microscope device 5301 is enlarged and displayed on a display device 5041 installed in an operating room. The display device 5041 is installed in a position facing an operator 5067, who performs various procedures on the surgical site, such as resecting the affected area, while observing the state of the surgical site using the image displayed on the display device 5041. Microsurgery systems are used, for example, in ophthalmic surgery and brain surgery.

[0329] The above describes examples of an endoscopic system 5000 and a microsurgery system 5300 to which the technology of the present disclosure can be applied. Note that the systems to which the technology of the present disclosure can be applied are not limited to these examples. For example, the support device 5027 may support another observation device or another surgical tool at its tip instead of the endoscope 5001 or the microscope unit 5303. Examples of such other observation devices include forceps, a surgeon, an insufflation tube for insufflation, or an energy treatment tool for incising tissue or sealing blood vessels by cauterization. Supporting these observation devices and surgical tools with a support device allows them to be more stably fixed in position than when medical staff support them manually, and also reduces the burden on medical staff. The technology of the present disclosure may be applied to support devices that support components other than the microscope unit.

[0330] Of the configurations described above, the technology according to the present disclosure can be suitably applied to the camera 5005. In particular, the zoom lens according to the present disclosure can be suitably applied to at least some of the optical systems of the camera 5005: the focusing optical system 50051, the zoom optical system 50052, and the focus optical system 50053.

[0331] <6. Other embodiments> The technology according to the present disclosure is not limited to the above-described embodiments and examples, and various modifications are possible.

[0332] For example, the shapes and numerical values ​​of each part shown in the above embodiment and example are merely examples of specific embodiments for implementing this technology, and the technical scope of this technology should not be interpreted in a limited manner based on these.

[0333] Furthermore, for example, the configuration may include a number of lenses different from the number of lenses shown in the above embodiment and example, or may include a lens that has substantially no refractive power.

[0334] For example, the present technology can be configured as follows. According to the present technology having the following configuration, the configuration of each lens group is optimized so that the weight of the lens group that moves during zooming can be reduced while still allowing for good aberration correction. This makes it possible to provide a compact, wide-angle zoom lens that can provide good aberration correction while still allowing for the weight of the lens group that moves during zooming, and an imaging device equipped with such a zoom lens.

[0335] [1] a first negative lens group arranged closest to the object side and including, in order from the object side to the image plane side, a first negative meniscus lens having a convex surface facing the object side and a second negative meniscus lens having a convex surface facing the object side; a positive lens group having an aperture stop and arranged closer to the image plane than the first negative lens group; a second negative lens group arranged closer to the image plane than the positive lens group; and a plurality of lens groups including During zooming, the first negative lens group remains stationary, and the spacing between adjacent lens groups in the plurality of lens groups changes. do It is configured as follows: The following condition is satisfied: Zoom lens. 0.7<|fGR1 / fw|<2.2 ……(1) 0.7<|BFw / fw|<2.4 ……(2) 1.4<(R1f+R1r) / (R1f-R1r)<5.2 ……(3) 1.3<(fG2) / (fGR1)<4.1 ……(4) however, fGR1: focal length of the first negative lens group fw: focal length of the entire system at the wide-angle end BFw: back focus at the wide-angle end (the distance from the lens surface closest to the image plane of the lens groups to the image plane) R1f: radius of curvature of the object side surface of the first negative meniscus lens R1r: radius of curvature of the image-side surface of the first negative meniscus lens fG2: focal length of the second negative meniscus lens Let's say. [2] The first negative lens group has three negative lenses including the first negative meniscus lens and the second negative meniscus lens. The zoom lens according to [1] above. [3] Furthermore, the following condition is satisfied: The zoom lens according to [1] or [2] above. 1.2<β2n<4.2 ……(5) however, β2n: lateral magnification of the second negative lens group at the telephoto end Let's say. [4] When focusing from infinity to a close object distance, the lens group arranged closer to the image plane than the positive lens group among the plurality of lens groups moves as a focus lens group. The zoom lens according to any one of [1] to [3] above. [5] Furthermore, the following condition is satisfied: The zoom lens according to any one of [1] to [4] above. 0.3<|fa / fb|<1.1 ……(6) however, fa: a composite focal length at the wide-angle end of a lens group among the plurality of lens groups that is closer to the object than the positive lens group fb: a composite focal length at the wide-angle end from the positive lens group to the lens group closest to the image plane among the plurality of lens groups Let's say. [6] The first negative lens group has at least one aspherical surface. The zoom lens according to any one of [1] to [5] above. [7] The positive lens group has at least one aspherical surface. The zoom lens according to any one of [1] to [6] above. [8] Among the plurality of lens groups, all of the lens groups that move during zooming move toward the object side during zooming from the wide-angle end to the telephoto end. The zoom lens according to any one of [1] to [7] above. [9] Among the plurality of lens groups, the lens group arranged closest to the image plane does not move during zooming. The zoom lens according to any one of [1] to [8] above.

[10] Furthermore, the following condition is satisfied: The zoom lens according to any one of [1] to [9] above. 0.8<(R1r+R2f) / (R2f-R1r)<12.0 ……(7) however, R1r: radius of curvature of the image-side surface of the first negative meniscus lens R2f: radius of curvature of the object side surface of the second negative meniscus lens Let's say.

[11] Furthermore, the following condition is satisfied: The zoom lens according to any one of [1] to

[10] above. however, fG2: focal length of the second negative meniscus lens fw: focal length of the entire system at the wide-angle end Let's say.

[12] A mechanism is provided for electrically driving all of the lens groups that move during zooming. The zoom lens according to any one of [1] to

[11] above.

[13] a zoom lens and an imaging element that outputs an imaging signal corresponding to an optical image formed by the zoom lens; The zoom lens is a first negative lens group arranged closest to the object side and including, in order from the object side to the image plane side, a first negative meniscus lens having a convex surface facing the object side and a second negative meniscus lens having a convex surface facing the object side; a positive lens group having an aperture stop and arranged closer to the image plane than the first negative lens group; a second negative lens group arranged closer to the image plane than the positive lens group; and a plurality of lens groups including During zooming, the first negative lens group remains stationary, and the spacing between adjacent lens groups in the plurality of lens groups changes. do It is configured as follows: The following condition is satisfied: Imaging device. 0.7<|fGR1 / fw|<2.2 ……(1) 0.7<|BFw / fw|<2.4 ……(2) 1.4<(R1f+R1r) / (R1f-R1r)<5.2 ……(3) 1.3<(fG2) / (fGR1)<4.1 ……(4) however, fGR1: focal length of the first negative lens group fw: focal length of the entire system at the wide-angle end BFw: back focus at the wide-angle end (the distance from the lens surface closest to the image plane of the lens groups to the image plane) R1f: radius of curvature of the object side surface of the first negative meniscus lens R1r: radius of curvature of the image-side surface of the first negative meniscus lens fG2: focal length of the second negative meniscus lens Let's say.

[14] Further provided with a lens having substantially no refractive power. The zoom lens according to any one of [1] to

[12] above.

[15] The zoom lens further comprises a lens having substantially no refractive power. The imaging device according to

[13] above. [Explanation of symbols]

[0336] GR1...first lens group (first negative lens group), GR2...second lens group (positive lens group (Examples 1 to 5, 8 to 12)), GR3...third lens group (second negative lens group (Examples 8, 9, 12), positive lens group (Examples 6 and 7)), GR4...fourth lens group (second negative lens group (Examples 1 to 5, 10, 11)), GR5...fifth lens group (second negative lens group (Examples 6 and 7)), GRs...positive lens group, IMG...image plane, St...aperture stop, Stc...stop (unnecessary light cut stop), Z1...optical axis, 1 to 12...zoom lens , 110...camera block, 111...imaging lens, 112...imaging element, 20...camera signal processing unit, 30...image processing unit, 40...LCD, 50...R / W (reader / writer), 60...CPU, 70...input unit, 80...lens drive control unit, 100...imaging device, 1000...memory card, 5005...camera, 50051...focusing optical system, 50052...zoom optical system, 50053...focusing optical system, 50054...light receiving element, 7410...imaging unit, 7910, 7912, 7914, 7916, 7918...imaging unit.

Claims

1. a first negative lens group arranged closest to the object side and including, in order from the object side to the image plane side, a first negative meniscus lens having a convex surface facing the object side and a second negative meniscus lens having a convex surface facing the object side; a positive lens group having an aperture stop and arranged closer to an image plane than the first negative lens group; a second negative lens group arranged closer to the image plane than the positive lens group; and a plurality of lens groups including During zooming, the first negative lens group is stationary, and the intervals between adjacent lens groups among the plurality of lens groups are changed, the first negative lens group has three negative lenses including the first negative meniscus lens and the second negative meniscus lens, when focusing from infinity to a close distance, a lens group among the plurality of lens groups that is disposed closer to the image plane than the positive lens group moves as a focus lens group, The following condition is satisfied: Zoom lens. 0.9<|fGR1 / fw|<1.8...(1A) 0.7<|BFw / fw|<2.4...(2) 1.7<(R1f+R1r) / (R1f-R1r)<4.5...(3A) 1.3<(fG2) / (fGR1)<3.5...(4A) however, fGR1: focal length of the first negative lens group fw: focal length of the entire system at the wide-angle end BFw: back focus at the wide-angle end (the distance from the lens surface closest to the image plane among the plurality of lens groups to the image plane) R1f: radius of curvature of the object side surface of the first negative meniscus lens R1r: radius of curvature of the image-side surface of the first negative meniscus lens fG2: focal length of the second negative meniscus lens Let's say.

2. Furthermore, the following condition is satisfied:

2. The zoom lens according to claim 1. 1.2<β2n<4.2...(5) however, β2n: lateral magnification of the second negative lens unit at the telephoto end Let's say.

3. Furthermore, the following condition is satisfied:

2. The zoom lens according to claim 1. 0.3<|fa / fb|<1.1...(6) however, fa: composite focal length at the wide-angle end of the lens group among the plurality of lens groups that is closer to the object than the positive lens group fb: composite focal length at the wide-angle end from the positive lens group to the lens group closest to the image plane among the plurality of lens groups Let's say.

4. The first negative lens group has at least one aspherical surface.

2. The zoom lens according to claim 1.

5. The positive lens group has at least one aspherical surface.

2. The zoom lens according to claim 1.

6. Among the plurality of lens groups, all of the lens groups that move during zooming move toward the object side during zooming from the wide-angle end to the telephoto end.

2. The zoom lens according to claim 1.

7. Among the plurality of lens groups, the lens group arranged closest to the image plane does not move during zooming.

2. The zoom lens according to claim 1.

8. Furthermore, the following condition is satisfied:

2. The zoom lens according to claim 1. 0.8<(R1r+R2f) / (R2f-R1r)<12.0...(7) however, R1r: radius of curvature of the image-side surface of the first negative meniscus lens R2f: radius of curvature of the object side surface of the second negative meniscus lens Let's say.

9. Furthermore, the following condition is satisfied:

2. The zoom lens according to claim 1. 1.2<(fG2) / (fw)<4.9...(8) however, fG2: focal length of the second negative meniscus lens fw: focal length of the entire system at the wide-angle end Let's say.

10. A mechanism is provided for electrically driving all of the lens groups that move during zooming.

2. The zoom lens according to claim 1.

11. a zoom lens and an imaging element that outputs an imaging signal corresponding to an optical image formed by the zoom lens; The zoom lens is a first negative lens group arranged closest to the object side and including, in order from the object side to the image plane side, a first negative meniscus lens having a convex surface facing the object side and a second negative meniscus lens having a convex surface facing the object side; a positive lens group having an aperture stop and arranged closer to an image plane than the first negative lens group; a second negative lens group arranged closer to the image plane than the positive lens group; and a plurality of lens groups including During zooming, the first negative lens group is stationary, and the intervals between adjacent lens groups among the plurality of lens groups are changed, the first negative lens group has three negative lenses including the first negative meniscus lens and the second negative meniscus lens, when focusing from infinity to a close distance, a lens group among the plurality of lens groups that is disposed closer to the image plane than the positive lens group moves as a focus lens group, The following condition is satisfied: Imaging device. 0.9<|fGR1 / fw|<1.8...(1A) 0.7<|BFw / fw|<2.4...(2) 1.7<(R1f+R1r) / (R1f-R1r)<4.5...(3A) 1.3<(fG2) / (fGR1)<3.5...(4A) however, fGR1: focal length of the first negative lens group fw: focal length of the entire system at the wide-angle end BFw: back focus at the wide-angle end (the distance from the lens surface closest to the image plane among the plurality of lens groups to the image plane) R1f: radius of curvature of the object side surface of the first negative meniscus lens R1r: radius of curvature of the image-side surface of the first negative meniscus lens fG2: focal length of the second negative meniscus lens Let's say.

12. Further provided with a lens having substantially no refractive power.

11. The zoom lens according to claim 1.

13. The zoom lens further comprises a lens having substantially no refractive power. The imaging device according to claim 11.

Images