Optical system and imaging apparatus

Abstract

To provide a lightweight optical system that has excellent swinging property and high optical performance over the entire screen, and an imaging apparatus in which such an optical system is mounted.SOLUTION: An optical system comprises, in order from an object side to an image surface side: a first lens group which has positive refractive power as an entire group and in which the entire group is fixed with respect to an image surface during focusing; a second lens group which has positive or negative refractive power as the entire group and in which the entire group moves in an optical axis direction to perform focusing from infinity to a close distance; and a third lens group which is divided into a 3a group, a 3b group, and a 3c group in order from the object side to the image surface side, so as to perform blur correction of an image by moving the 3b group in a direction substantially perpendicular to an optical axis, which has negative or positive refractive power as the entire group, and in which the entire group is fixed with respect to the image surface during focusing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an optical system suitable for an interchangeable lens that can be attached to, for example, a digital still camera or a digital mirrorless camera, and an imaging device including such an optical system. [Background technology]

[0002] In recent years, the number of pixels in image sensors used in interchangeable lens digital camera systems has been increasing, and optical systems are being required to provide correspondingly high image quality. In addition, small and lightweight camera bodies are the norm for the interchangeable lens mirrorless cameras that have become widespread in recent years, and optical systems are being developed that are also required to be small and lightweight (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-215492 A Summary of the Invention

[0004] On the other hand, telephoto lenses compatible with large image sensors such as full-size sensors generally end up being large in size, so the optical system needs to have a weight balance with the center of gravity close to that of the camera body, which is ideal for small, lightweight camera bodies in terms of maneuverability.

[0005] It is desirable to provide an optical system that is lightweight, easy to handle, and has high optical performance over the entire screen, and an imaging device equipped with such an optical system.

[0006] An optical system according to an embodiment of the present disclosure includes, in order from the object side to the image surface side, a first lens group having positive refractive power as a whole and fixed relative to the image surface during focusing; a second lens group having positive or negative refractive power as a whole and performing focusing from infinity to a close distance by moving as a whole in the direction of the optical axis; and a third lens group divided into groups 3a, 3b, and 3c, in order from the object side to the image surface side, where group 3b corrects image blur by moving in a direction approximately perpendicular to the optical axis, has negative or positive refractive power as a whole and is fixed relative to the image surface during focusing, and satisfies the following conditional expressions (1) to (3), and group 3c includes at least one negative lens that satisfies the following conditional expression (6): D_g1max / f>0.23 ……(2) D_3bImg / f<0.24 ……(3) θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.008 ……(6) however, L: Distance from the surface of the first lens group closest to the object to the image plane f: focal length of the entire system when focused at infinity D_g1max: The maximum air gap on the optical axis within the first lens group D_3bImg: Distance from the surface closest to the object in group 3b to the image plane θgF_3cn: The partial dispersion ratio between g-line and F-line of the negative lens in the 3c group νd_3cn: Abbe number for the d line of the negative lens in the 3c group Let us assume that.

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

[0008] An optical system or an imaging device according to an embodiment of the present disclosure is configured with three lens groups as a whole, and the configuration of each lens group is optimized. [Brief description of the drawings]

[0009] [Figure 1] 1 is a lens cross-sectional view showing a first configuration example (Example 1) of an optical system according to an embodiment of the present disclosure. [Diagram 2] 2 is an aberration diagram showing longitudinal aberration when focusing on infinity in the optical system according to Example 1 in which specific values ​​are applied to the optical system shown in FIG. 1. [Diagram 3] 2 is an aberration diagram showing lateral aberration when focused on infinity and when image stabilization is not performed in the optical system according to Example 1 in which specific values ​​are applied to the optical system shown in FIG. 1. [Figure 4] 2 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in the optical system according to Example 1 in which specific values ​​are applied to the optical system shown in FIG. 1. [Diagram 5] FIG. 4 is a lens cross-sectional view showing a second configuration example (Example 2) of the optical system according to the embodiment. [Figure 6] 6 is an aberration diagram showing longitudinal aberration when focusing on infinity in an optical system according to Example 2 in which specific numerical values ​​are applied to the optical system shown in FIG. 5. FIG. [Figure 7] 6 is an aberration diagram showing lateral aberration when focused on infinity and when image stabilization is not performed in the optical system according to Example 2 in which specific values ​​are applied to the optical system shown in FIG. 5. FIG. [Figure 8] 6 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in an optical system according to Example 2 in which specific values ​​are applied to the optical system shown in FIG. 5. FIG. [Figure 9] FIG. 11 is a lens cross-sectional view showing a third configuration example (Example 3) of the optical system according to the embodiment. [Figure 10] 10 is an aberration diagram showing longitudinal aberration when focusing on infinity in an optical system according to Example 3 in which specific numerical values ​​are applied to the optical system shown in FIG. 9. [Figure 11] 10 is an aberration diagram showing lateral aberration in an optical system according to Example 3 in which specific values ​​are applied to the optical system shown in FIG. 9, when focused on infinity and when image stabilization is not performed. [Figure 12] 10 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in an optical system according to Example 3 in which specific values ​​are applied to the optical system shown in FIG. 9. [Figure 13] FIG. 11 is a lens cross-sectional view showing a fourth configuration example (Example 4) of the optical system according to the embodiment. [Figure 14] 14 is an aberration diagram showing longitudinal aberration when focusing on an object at infinity in the optical system according to Example 4 in which specific numerical values ​​are applied to the optical system shown in FIG. [Figure 15] 14 is an aberration diagram showing lateral aberration when focused on infinity and when image stabilization is not performed in the optical system according to Example 4 in which specific values ​​are applied to the optical system shown in FIG. 13. [Figure 16] 14 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in an optical system according to Example 4 in which specific values ​​are applied to the optical system shown in FIG. 13. [Figure 17] FIG. 11 is a lens cross-sectional view showing a fifth configuration example (Example 5) of an optical system according to an embodiment. [Figure 18] 18 is an aberration diagram showing longitudinal aberration when focusing on an object at infinity in the optical system according to Example 5 in which specific values ​​are applied to the optical system shown in FIG. 17. [Figure 19] 18 is an aberration diagram showing lateral aberration when focused on infinity and when image stabilization is not performed in the optical system according to Example 5 in which specific values ​​are applied to the optical system shown in FIG. 17. [Figure 20] 18 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in the optical system according to Example 5 in which specific values ​​are applied to the optical system shown in FIG. 17. [Figure 21] FIG. 13 is a lens cross-sectional view showing a sixth configuration example (Example 6) of an optical system according to an embodiment. [Figure 22] 22 is an aberration diagram showing longitudinal aberration when focusing on an object at infinity in an optical system according to Example 6 in which specific numerical values ​​are applied to the optical system shown in FIG. 21. FIG. [Figure 23] 22 is an aberration diagram showing lateral aberration when focused on infinity and when image stabilization is not performed in the optical system according to Example 6 in which specific values ​​are applied to the optical system shown in FIG. 21. FIG. [Figure 24] 22 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in an optical system according to Example 6 in which specific values ​​are applied to the optical system shown in FIG. 21. FIG. [Diagram 25]FIG. 13 is a lens cross-sectional view showing a seventh configuration example (Example 7) of the optical system according to the embodiment. [Figure 26] 26 is an aberration diagram showing longitudinal aberration when focusing on an object at infinity in the optical system according to Example 7 in which specific numerical values ​​are applied to the optical system shown in FIG. 25. FIG. [Figure 27] FIG. 26 is an aberration diagram showing lateral aberration in an optical system according to Example 7 in which specific values ​​are applied to the optical system shown in FIG. 25, when focused on infinity and when image stabilization is not performed. [Figure 28] 26 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in the optical system according to Example 7 in which specific values ​​are applied to the optical system shown in FIG. 25. FIG. [Figure 29] FIG. 13 is a lens cross-sectional view showing an eighth configuration example (Example 8) of the optical system according to the embodiment. [Diagram 30] FIG. 30 is an aberration diagram showing longitudinal aberration when focusing on an object at infinity in the optical system according to Example 8 in which specific numerical values ​​are applied to the optical system shown in FIG. 29. [Diagram 31] FIG. 30 is an aberration diagram showing lateral aberration in an optical system according to Example 8 in which specific values ​​are applied to the optical system shown in FIG. 29 when focused on infinity and when image stabilization is not performed. [Diagram 32] FIG. 30 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in the optical system according to Example 8 in which specific values ​​are applied to the optical system shown in FIG. 29. [Diagram 33] FIG. 13 is a lens cross-sectional view showing a ninth configuration example (Example 9) of an optical system according to an embodiment. [Diagram 34] 34 is an aberration diagram showing longitudinal aberration when focusing on an object at infinity in the optical system according to Example 9 in which specific values ​​are applied to the optical system shown in FIG. 33. [Diagram 35] 34 is an aberration diagram showing lateral aberration in an optical system according to Example 9 in which specific values ​​are applied to the optical system shown in FIG. 33, when focused on infinity and when image stabilization is not performed. [Diagram 36] 34 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in an optical system according to Example 9 in which specific values ​​are applied to the optical system shown in FIG. 33. [Figure 37]FIG. 16 is a lens cross-sectional view showing a tenth configuration example (Example 10) of the optical system according to an embodiment. [Figure 38] 38 is an aberration diagram showing longitudinal aberration when focusing on infinity in the optical system according to Example 10 in which specific values ​​are applied to the optical system shown in FIG. 37. FIG. [Figure 39] FIG. 38 is an aberration diagram showing lateral aberration in an optical system according to Example 10 in which specific values ​​are applied to the optical system shown in FIG. 37 when focused on infinity and when image stabilization is not performed. [Diagram 40] 38 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in the optical system according to Example 10 in which specific values ​​are applied to the optical system shown in FIG. 37. [Diagram 41] FIG. 17 is a lens cross-sectional view showing an eleventh configuration example (Example 11) of the optical system according to an embodiment. [Diagram 42] 42 is an aberration diagram showing longitudinal aberration at infinity focusing in the optical system according to Example 11 in which specific numerical values ​​are applied to the optical system shown in FIG. 41. FIG. [Diagram 43] FIG. 42 is an aberration diagram showing lateral aberration in an optical system according to Example 11 in which specific values ​​are applied to the optical system shown in FIG. 41 when focused on infinity and when image stabilization is not performed. [Diagram 44] 42 is an aberration diagram showing lateral aberration when focusing on infinity and performing image stabilization in the optical system according to Example 11 in which specific values ​​are applied to the optical system shown in FIG. 41. [Diagram 45] FIG. 1 is a block diagram showing an example of the configuration of an imaging device. [Figure 46] 1 is a block diagram showing an example of a schematic configuration of a vehicle control system; [Figure 47] 4 is an explanatory diagram showing an example of the installation positions of an outside-vehicle information detection unit and an imaging unit; FIG. [Figure 48] 1 is a configuration diagram showing an example of a schematic configuration of an endoscopic surgery system. [Figure 49] 49 is a block diagram showing an example of the functional configuration of the camera head and the CCU shown in FIG. 48. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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. Actions and Effects 3. Application examples to imaging devices 4. Numerical examples of lenses 5. Application Examples 6. Other embodiments

[0011] <0. Comparative Examples> Small and lightweight camera bodies are the norm for interchangeable lens mirrorless cameras, which have become popular in recent years. However, telephoto lenses compatible with large image sensors such as full-size sensors generally end up being large in size, so there is a strong demand for the optical system to have a weight balance with the center of gravity close to the camera body, which is suitable for a small and lightweight body, and for the optical system itself to be lightweight.

[0012] Patent Document 1 (JP 2017-215492 A) proposes an optical system that is composed of, in order from the object side to the image surface side, a first lens group with positive refractive power, a second lens group with positive or negative refractive power, and a third lens group with positive or negative refractive power, in which the second lens group moves during focusing, changing the interval between adjacent lens groups. In the optical system in Patent Document 1, the first lens group includes a positive lens G1p arranged closest to the object, a positive lens G2p arranged closer to the image surface than the positive lens G1p, and a positive lens G3p arranged closer to the image surface than the positive lens G2p. In the optical system in Patent Document 1, when the focal length of the optical system is f, the distance on the optical axis from the lens surface in the first lens group closest to the object to the image plane is LD, the distance on the optical axis between the positive lens G1p and the lens arranged adjacent to the image plane side of the positive lens G1p is D12, the Abbe number of the material of the positive lens G2p is νdG2p, and the Abbe number of the material of the positive lens G3p is νdG3p, the following conditional formula is satisfied. LD / f<1.0 0.20≦D12 / LD<0.500 νdG2p>73.0 νdG3p>73.0

[0013] In the optical system of Patent Document 1, a large air gap is provided within the first lens group to reduce the weight of the lens barrel. However, although Patent Document 1 describes that any lens block in the optical system can be set as the vibration isolation group, in reality, lens blocks that satisfy the appropriate vibration isolation sensitivity (ratio of the amount of movement of the image to the amount of movement of the vibration isolation group in the direction perpendicular to the optical axis) suitable for functioning as the vibration isolation group and good optical performance when the vibration isolation group is shifted are extremely limited, and it is impossible to set any lens block as the vibration isolation group in order to establish the minimum vibration isolation function of the optical system. And, in Patent Document 1, the lens blocks that can actually play the role of the vibration isolation group in the examples are all located away from the image plane, and the center of gravity of the lens barrel is located away from the camera body, so that the comfortable swingability of the lens barrel is insufficient.

[0014] Therefore, it is desirable to provide an optical system that is optimal for mirrorless camera systems, etc., that is a telephoto lens with an anti-vibration function compatible with a large image sensor, is lightweight, has a center of gravity close to the image plane side, is easy to handle, and has high optical performance with chromatic aberration and other issues suppressed across the entire image plane. An optical system according to an embodiment of the present disclosure described below is suitable for a telephoto lens used in such a mirrorless digital camera or the like.

[0015] <1. Basic lens structure> FIG. 1 illustrates a first configuration example of an optical system according to an embodiment of the present disclosure, which corresponds to the configuration of Example 1 described later. FIG. 5 illustrates a second configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 2 described later. FIG. 9 illustrates a third configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 3 described later. FIG. 13 illustrates a fourth configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 4 described later. FIG. 17 illustrates a fifth configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 5 described later. FIG. 21 illustrates a sixth configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 6 described later. FIG. 25 illustrates a seventh configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 7 described later. FIG. 29 illustrates an eighth configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 8 described later. FIG. 33 illustrates a ninth configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 9 described later. FIG. 37 illustrates a tenth configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 10 described later. FIG. 41 illustrates an eleventh configuration example of an optical system according to an embodiment, which corresponds to the configuration of Example 11 described later.

[0016] In Fig. 1 and other figures, Z1 indicates the optical axis. An optical member such as a cover glass for protecting the imaging element may be disposed between the optical systems 1 to 11 according to the first to sixth configuration examples and the image surface Simg. In addition to the cover glass, various optical filters such as a low-pass filter and an infrared cut filter may be disposed.

[0017] Below, the configuration of an optical system according to one embodiment of the present disclosure will be described in association with optical systems 1 to 11 according to each configuration example shown in FIG. 1 etc., as appropriate; however, the technology according to the present disclosure is not limited to the configuration examples shown in the drawings.

[0018] The optical system according to one embodiment is composed of, in order from the object side to the image plane side, a first lens group GR1, a second lens group GR2, and a third lens group GR3.

[0019] The first lens group GR1 as a whole has positive refractive power, and the whole group is fixed with respect to the image surface Simg during focusing.

[0020] The second lens group GR2 has positive or negative refractive power as a whole group, and focuses from infinity to a close distance by moving the whole group in the optical axis direction. Note that each configuration example in FIG. 1 and the like shows the lens arrangement when focusing at infinity. In the first configuration example (Example 1) to the sixth configuration example (Example 6), the second lens group GR2 has positive refractive power as a whole group, and when focusing from infinity to a close distance, the second lens group GR2 moves toward the object side. In the seventh configuration example (Example 7) to the eleventh configuration example (Example 11), the second lens group GR2 has negative refractive power as a whole group, and when focusing from infinity to a close distance, the second lens group GR2 moves toward the image surface side.

[0021] The third lens group GR3 has negative or positive refractive power as a whole, and is fixed relative to the image surface Simg during focusing. The third lens group GR3 is divided into a 3a group GR3a, a 3b group GR3b, and a 3c group GR3c, in that order from the object side to the image surface side. The 3b group GR3b is an anti-vibration group, and corrects image blur by moving in a direction substantially perpendicular to the optical axis Z1. In the first configuration example (Example 1) to the tenth configuration example (Example 10), the third lens group GR3 has negative refractive power as a whole. In the eleventh configuration example (Example 11), the third lens group GR3 has positive refractive power as a whole.

[0022] It is desirable that the aperture stop St be disposed between the group 3a GR3a and the group 3b GR3b.

[0023] Moreover, the optical system according to one embodiment satisfies the following conditional expressions (1) to (3). L / f<1 ……(1) D_g1max / f>0.23 ……(2) D_3bImg / f<0.24 ……(3) however, L: Distance from the surface of the first lens group GR1 closest to the object to the image plane Simg f: focal length of the entire system when focused at infinity D_g1max: The maximum air gap on the optical axis within the first lens group GR1 D_3bImg: Distance from the surface closest to the object in group 3b, GR3b, to the image plane Simg Let us assume that.

[0024] In addition, it is desirable for the optical system according to one embodiment to satisfy certain conditional expressions, which will be described later.

[0025] <2. Actions and Effects> Next, the operation and effects of the optical system according to the embodiment of the present disclosure will be described, along with a more preferable configuration of the optical system according to the embodiment of the present disclosure. It should be noted that the effects described in this specification are merely examples and are not limiting, and other effects may also be obtained.

[0026] According to an optical system according to one embodiment, the optical system is configured with three lens groups overall, and the configuration of each lens group is optimized. This makes it possible to realize a lightweight optical system with the center of gravity close to the image plane, which provides excellent maneuverability, and high optical performance with chromatic aberration and the like suppressed across the entire image plane.

[0027] In the optical system according to the embodiment, a large air gap is provided within the first lens group GR1, realizing a lightweight structure. In addition, in the optical system according to the embodiment, the vibration reduction group (3b group GR3b) is disposed at the rear, so that the actuator that drives the lens can be disposed closer to the image plane, and the center of gravity is closer to the image plane, realizing an optical system with excellent maneuverability.

[0028] Satisfying the above conditional formula (1) generally indicates that the optical system is a telephoto system. In an optical system that satisfies conditional formula (1), such as a telephoto lens, the third lens group GR3 fixed with respect to the image surface Simg is divided into three blocks, the 3a group GR3a, the 3b group GR3b, and the 3c group GR3c, and the 3b group GR3b sandwiched in the center is a vibration-proof group, and is disposed at a position that satisfies conditional formula (3) with respect to the image surface Simg. By sandwiching the 3b group GR3b, which is a vibration-proof group, between the 3a group GR3a and the 3c group GR3c, which are located at the front and rear of the group GR3a and which compensate for aberration correction during vibration proofing, and by disposing the vibration-proof group at a rear position that satisfies conditional formula (3) with respect to the image surface Simg, the height at which light rays pass through the vibration-proof group from the on-axis to the peripheral image height, which is related to aberration degradation during vibration proofing, is lowered, and good imaging performance can be obtained even during vibration proofing. In addition, because the light passing height is reduced, the diameter of the vibration isolation group can be reduced, and it is easy to reduce the size and weight of the actuator unit that drives the vibration isolation group. Furthermore, by placing the vibration isolation group at the rear, the actuator that drives the vibration isolation group is also placed at the rear, so the center of gravity is moved closer to the image plane, resulting in an optical system with excellent maneuverability.

[0029] In addition, by satisfying conditional expressions (1) and (3) as well as conditional expression (2), the weight of the optical elements at the front of the lens barrel, which accounts for a large proportion of the weight of the lens barrel in a telephoto lens, can be reduced. However, simply satisfying conditional expression (2) and providing a large air gap in the first lens group GR1 causes chromatic aberration occurring in the optical system closer to the object than the maximum air gap to expand in proportion to the distance as it propagates through the air gap, making it difficult to achieve high imaging performance as a whole optical system. However, by simultaneously satisfying the above-mentioned conditional expression (3), the 3c group GR3c is disposed at the rear of the optical system, i.e., close to the image plane Simg, and at a position with a high marginal ray height, together with the 3b group GR3b, and thus has a high aberration correction capability, and therefore can be made to act to cancel out the aberration occurring in the first lens group GR1, which is located approximately symmetrically in the optical system, and high imaging performance can be achieved even when a large air gap is provided in the first lens group GR1.

[0030] In order to more effectively realize the effects of the above-described conditional expressions (2) and (3), it is more desirable to set the numerical ranges of the conditional expressions (2) and (3) as specified by the following conditional expressions (2)' and (3)'. D_g1max / f>0.24 ……(2)' D_3bImg / f<0.23 ……(3)'

[0031] Even more preferably, the numerical ranges of the conditional expressions (2) and (3) should be set as shown in the following conditional expressions (2)'', (3)''. D_g1max / f>0.25 ……(2)'' D_3bImg / f<0.22 ……(3)''

[0032] In the optical system according to one embodiment, it is desirable that the first lens group GR1 has at least one positive lens that satisfies the following conditional expressions (4) and (5). νd_1p>90 ……(4) θgF_1p-(-0.001801*νd_1p+0.648262)>0.04 ……(5) however, νd_1p: Abbe number for the d-line of the positive lens in the first lens group GR1 θgF_1p: The partial dispersion ratio between the g-line and F-line of the positive lens in the first lens group GR1 Let us assume that.

[0033] By using a low-dispersion glass material with strong anomalous dispersion that simultaneously satisfies conditional expressions (4) and (5) for the positive lens in the first lens group GR1, it is possible to effectively correct chromatic aberration, which is an issue in telephoto lenses. If the lower limit of conditional expression (4) is not met, correction of first- and second-order chromatic aberration becomes insufficient, and imaging performance across the entire screen deteriorates. If the lower limit of conditional expression (5) is not met, correction of second-order chromatic aberration becomes insufficient, and imaging performance across the entire screen deteriorates. Note that first-order chromatic aberration refers to chromatic aberration between the F-line and C-line, while second-order chromatic aberration refers to chromatic aberration including the even shorter wavelength region (typically the g-line).

[0034] In order to more effectively realize the effect of the above-mentioned conditional expression (5), it is more desirable to set the numerical range of conditional expression (5) as shown in the following conditional expression (5)'. θgF_1p-(-0.001801*νd_1p+0.648262)>0.05 ……(5)'

[0035] Even more preferably, the numerical range of conditional expression (5) should be set to satisfy the following conditional expression (5)''. θgF_1p-(-0.001801*νd_1p+0.648262)>0.06 ……(5)''

[0036] In the optical system according to one embodiment, it is desirable for the 3c group GR3c to include at least one negative lens that satisfies the following conditional expression (6). θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.008 ……(6) however, θgF_3cn: The partial dispersion ratio between the g-line and the F-line of the negative lens in group 3c, GR3c νd_3cn: Abbe number for the d line of the negative lens in group 3c GR3c Let us assume that.

[0037] By using an anomalous dispersion glass material that satisfies conditional formula (6) for the negative lens in group 3c, GR3c, lateral chromatic aberration is well corrected, and good imaging performance can be obtained even at the periphery. If the lower limit of conditional formula (6) is not met, correction of mainly secondary lateral chromatic aberration becomes insufficient, and imaging performance at the periphery of the image decreases.

[0038] In order to more effectively realize the effect of the above-mentioned conditional expression (6), it is more desirable to set the numerical range of conditional expression (6) as shown in the following conditional expression (6)'. θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.012 ……(6)'

[0039] Even more preferably, the numerical range of conditional expression (6) should be set to satisfy the following conditional expression (6)''. θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.016 ……(6)''

[0040] In the optical system according to one embodiment, it is desirable for the 3c group GR3c to include at least one negative lens that satisfies the following conditional expression (7). νd_3cn<31 ……(7) however, νd_3cn: Abbe number for the d line of the negative lens in group 3c GR3c Let us assume that.

[0041] By using an anomalous dispersion glass material that satisfies condition (7) for the negative lens in group 3c, GR3c, lateral chromatic aberration is well corrected, and good imaging performance can be obtained even at the periphery. If the upper limit of condition (7) is exceeded, correction of first- and second-order chromatic aberration becomes insufficient, and imaging performance across the entire image field deteriorates.

[0042] In order to more effectively realize the effect of the above-mentioned conditional expression (7), it is more desirable to set the numerical range of conditional expression (7) as shown in the following conditional expression (7)'. νd_3cn<28 ……(7)'

[0043] Even more preferably, the numerical range of conditional expression (7) should be set to satisfy the following conditional expression (7)''. νd_3cn<25 ……(7)''

[0044] In the optical system according to one embodiment, it is desirable for the 3c group GR3c to include at least one negative lens that satisfies the following conditional expression (8). 0<|f3cn / f|<0.15 ……(8) however, f3cn: focal length of the negative lens in group 3c GR3c f: focal length of the entire system when focused at infinity Let us assume that.

[0045] By disposing a negative lens that satisfies the focal length defined in conditional formula (8) in the 3c group GR3c, lateral chromatic aberration in the peripheral areas is corrected more effectively, making it possible to obtain good imaging performance even in the peripheral areas. If the upper limit of conditional formula (8) is exceeded, the negative lens loses its function and is unable to provide a chromatic aberration correction effect. If the lower limit of conditional formula (8) is exceeded, the power of the negative lens becomes too strong, and the correction of field curvature, astigmatism, and distortion aberration becomes poor.

[0046] In order to more effectively realize the effect of the above-mentioned conditional expression (8), it is more desirable to set the numerical range of conditional expression (8) as shown in the following conditional expression (8)'. 0<|f3cn / f|<0.13 ……(8)'

[0047] Even more preferably, the numerical range of conditional expression (8) should be set to satisfy the following conditional expression (8)''. 0<|f3cn / f|<0.10 ……(8)''

[0048] In an optical system according to one embodiment, it is preferable that the 3c group GR3c includes at least one negative lens that simultaneously satisfies any one of the above-mentioned conditional expressions (6), (7), or (8) and the following conditional expression (9): D_3cnImg / f<0.15 ……(9) however, f: focal length of the entire system when focused at infinity D_3cnImg: The distance between the vertex of the object-side surface of the negative lens in group GR3c and the image plane Simg Let us assume that.

[0049] By arranging a negative lens with high chromatic aberration correction capability closer to the image plane so as to simultaneously satisfy either one of the above conditional expressions (6), (7), or (8) and conditional expression (9), chromatic aberration is suppressed across the entire image plane, and high image quality can be obtained. If the upper limit of conditional expression (9) is exceeded, the negative lens is farther away from the image plane Simg, and the chromatic aberration correction capability becomes insufficient.

[0050] In order to more effectively realize the effect of the above-mentioned conditional expression (9), it is more desirable to set the numerical range of conditional expression (9) as shown in the following conditional expression (9)'. D_3cnImg / f<0.14 ……(9)'

[0051] Even more preferably, the numerical range of conditional expression (9) should be set to satisfy the following conditional expression (9)''. D_3cnImg / f<0.12 ……(9)''

[0052] In the optical system according to one embodiment, it is desirable that the first lens group GR1 has at least one negative lens that satisfies the following conditional expressions (10) and (11). νd_1n<35 ……(10) θgF_1n-(-0.001801*νd_1n+0.648262)<0.010 ……(11) however, νd_1n: Abbe number for the d-line of the negative lens in the first lens group GR1 θgF_1n: The partial dispersion ratio between the g-line and F-line of the negative lens in the first lens group GR1 Let us assume that.

[0053] By using a glass material having dispersion characteristics that satisfy conditional expressions (10) and (11) for the negative lenses in the first lens group GR1, chromatic aberration, which is a problem in telephoto lenses, can be effectively corrected. If the upper limit of conditional expression (10) is exceeded, correction of first- and second-order chromatic aberration becomes insufficient, and imaging performance across the entire screen deteriorates. If the upper limit of conditional expression (11) is exceeded, correction of second-order chromatic aberration becomes insufficient, and imaging performance across the entire screen deteriorates.

[0054] In order to better realize the effects of the above-described conditional expressions (10) and (11), it is more desirable to set the numerical ranges of the conditional expressions (10) and (11) as specified by the following conditional expressions (10)' and (11)'. νd_1n<32 ……(10)' θgF_1n-(-0.001801*νd_1n+0.648262)<0.009 ……(11)'

[0055] Even more preferably, the numerical range of conditional expression (10) should be set to satisfy the following conditional expression (10)''. νd_1n<27 ……(10)''

[0056] Moreover, it is desirable for the optical system according to one embodiment to satisfy the following conditional expression (12). 0.05<|f3c / f|<0.3 ……(12) however, f3c: Focal length of GR3c in the 3c group f: focal length of the entire system when focused at infinity Let us assume that.

[0057] By setting the focal length of the 3c group GR3c within the range that satisfies conditional expression (12), it is possible to obtain good optical performance during image stabilization while keeping the image stabilization sensitivity to a value appropriate for the image stabilization group. If the lower limit of conditional expression (12) is exceeded, the power of the 3c group GR3c becomes excessive, and the correction state of field curvature, astigmatism, and distortion aberration deteriorates. If the upper limit of conditional expression (12) is exceeded, the power of the 3c group GR3c becomes too weak, making it difficult to lower the image stabilization group backward while maintaining high optical performance during image stabilization.

[0058] In order to more effectively realize the effect of the above-mentioned conditional expression (12), it is more desirable to set the numerical range of conditional expression (12) as shown in the following conditional expression (12). 0.05<|f3c / f|<0.15 ……(12)'

[0059] In the optical system according to one embodiment, the second lens group GR2 is preferably made of a cemented lens or a single lens, which makes it possible to obtain a lightweight focusing group and realize high-speed and high-tracking AF (autofocus) performance.

[0060] <3. Application examples to imaging devices> Next, a specific example of application of the optical system according to the embodiment of the present disclosure to an imaging device will be described.

[0061] 45 shows an example of the configuration of an imaging device 100 to which an optical system according to an embodiment is applied. The imaging device 100 is, for example, a digital still camera, and includes a camera block 10, 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.

[0062] The camera block 10 has an imaging function and has an optical system including an imaging lens 110 and an imaging element 12 such as a CCD (Charge Coupled Devices) or a CMOS (Complementary Metal Oxide Semiconductor). The imaging element 12 converts an optical image formed by the imaging lens 110 into an electrical signal, thereby outputting an imaging signal (image signal) corresponding to the optical image. The optical systems 1 to 11 according to the configuration examples shown in FIG. 1 and the like can be applied as the imaging lens 110.

[0063] The camera signal processing unit 20 performs various signal processing on the image signal output from the imaging element 12, such as analog-to-digital conversion, noise removal, image quality correction, and conversion to luminance and color difference signals.

[0064] 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, conversion processing of data specifications such as resolution, etc.

[0065] The LCD 40 has a function of displaying various data such as the operating 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.

[0066] 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 an instruction input signal from the input unit 70. The input unit 70 is composed of various switches and the like that are operated by the user as required. The input unit 70 is composed of, for example, a shutter release button for performing a shutter operation and a selection switch for selecting an operation mode, and is configured to output an instruction input signal to the CPU 60 according to the user's operation. The lens drive control unit 80 controls the drive of the lenses arranged in the camera block 10, and is configured to control a motor (not shown) that drives each lens of the imaging lens 110 based on a control signal from the CPU 60.

[0067] 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 photographed by the camera block 10 is output to the LCD 40 via the camera signal processing unit 20 and displayed as a camera-through image. Also, when an instruction input signal for zooming or focusing is input from the input unit 70, the CPU 60 outputs a control signal to the lens drive control unit 80, and a predetermined lens of the imaging lens 110 moves under the control of the lens drive control unit 80.

[0068] When a shutter (not shown) of the camera block 10 is operated by an instruction input signal from the input unit 70, a 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.

[0069] Incidentally, focusing is performed by the lens drive control unit 80 moving a specified lens of the imaging lens 110 based on a control signal from the CPU 60, for example, when the shutter release button on the input unit 70 is half-pressed or fully pressed for recording (photographing).

[0070] When playing back image data recorded on memory card 1000, the R / W 50 reads out the specified image data from memory card 1000 in response to an operation on input unit 70, and after the image processing unit 30 performs an expansion / decoding process, the playback image signal is output to LCD 40 and the playback image is displayed.

[0071] In the above-described embodiment, an example in which the imaging device is applied to a digital still camera or the like has been shown, but the scope of application of the imaging device is not limited to digital still cameras, and the imaging device 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, and surveillance cameras. The imaging device can also be widely applied as a camera section of digital input / output devices such as mobile phones with built-in cameras and information terminals with built-in cameras. The imaging device can also be applied to interchangeable lens cameras. EXAMPLES

[0072] <4. Numerical examples of lenses> Next, specific numerical examples of the optical system according to the embodiment of the present disclosure will be described. Here, examples will be described in which specific numerical values ​​are applied to the optical systems 1 to 11 according to the configuration examples shown in FIG.

[0073] The meanings of the symbols used in the following tables and explanations are as follows. "Si" indicates the surface number, which means the i-th surface counting from the object side. "ri" indicates the radius of curvature of the i-th surface counting from the object side (unit: mm). "di" indicates the axial surface distance between the i-th surface and the i+1-th surface counting from the object side (unit: mm). "ndi" indicates the refractive index for the d-line (wavelength 587.6 nm) of the glass material or material having the i-th surface on the object side. "νdi" indicates the Abbe number for the d-line of the glass material or material having the i-th surface on the object side. "θgF" indicates the partial dispersion ratio between the g-line (wavelength 435.8 nm) and the F-line (wavelength 486.1 nm). "∞" in the radius of curvature indicates that the surface is flat. "STO" in the surface number column indicates that the aperture stop St is located at the corresponding position. "f" indicates the focal length of the entire lens 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 lens length (the distance from the surface closest to the object in the optical system to the image plane) (unit: mm). "BF" indicates the back focus (unit: mm).

[0074] [Configuration common to each embodiment] The optical systems 1 to 11 to which the following Examples 1 to 11 are applied all have a configuration that satisfies the above-mentioned <1. Basic lens configuration>.

[0075] That is, each of the optical systems 1 to 11 is composed of a first lens group GR1, a second lens group GR2, and a third lens group GR3.

[0076] The first lens group GR1 as a whole has positive refractive power, and the whole group is fixed with respect to the image surface Simg during focusing.

[0077] The second lens group GR2 has positive or negative refractive power as a whole, and performs focusing from infinity to a close distance by moving the whole group in the optical axis direction.

[0078] The third lens group GR3 has negative or positive refractive power as a whole, and is fixed relative to the image surface Simg during focusing. The third lens group GR3 is divided into a 3a group GR3a, a 3b group GR3b, and a 3c group GR3c, in that order from the object side to the image surface side. The 3b group GR3b is an image stabilizing group, and performs image blur correction by moving in a direction approximately perpendicular to the optical axis Z1.

[0079] An aperture stop St is disposed between the 3a group GR3a and the 3b group GR3b.

[0080] [Example 1] [Table 1] shows basic lens data of Example 1, in which specific values ​​are applied to the optical system 1 shown in Fig. 1. [Table 2] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 3] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0081] In the optical system 1 according to Example 1, the first lens group GR1 is composed of seven lenses, L11 to L17, in that order from the object side to the image side. The maximum air space on the optical axis within the first lens group GR1 is between the lenses L11 and L12.

[0082] In the optical system 1 according to Example 1, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has positive refractive power as a whole, and moves toward the object side when focusing from infinity to a close distance.

[0083] In the optical system 1 according to Example 1, the third lens group GR3 is composed of lenses L31 to L43, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 and L32. The 3b group GR3b is composed of lenses L33 to L35. The 3c group GR3c is composed of lenses L36 to L43. The third lens group GR3 has negative refractive power as a whole group.

[0084] [Table 1]

[0085] [Table 2]

[0086] [Table 3]

[0087] FIG. 2 shows longitudinal aberration in the optical system 1 according to the first embodiment when focusing at infinity. FIG. 2 shows spherical aberration, astigmatism (curvature of field), and distortion as longitudinal aberration. In the spherical aberration diagram, the dashed line shows values ​​at the C-line (wavelength 545.3 nm), the solid line shows values ​​at the d-line (wavelength 587.6 nm), and the dashed line shows values ​​at the g-line (wavelength 435.8 nm). In the astigmatism diagram, the solid line (S) shows values ​​at the sagittal image plane of the d-line, and the dashed line (T) shows values ​​at the tangential image plane of the d-line. In the distortion aberration diagram, values ​​at the d-line are shown. Also, FIG. 3 and FIG. 4 show transverse aberration in the optical system 1 according to the first embodiment when focusing at infinity. FIG. 3 shows transverse aberration when not image stabilization is performed, and FIG. 4 shows transverse aberration when image stabilization is performed. In the transverse aberration diagram, y shows image height, Δy shows transverse aberration in the tangential direction, and Δx shows transverse aberration in the sagittal direction. The same applies to the aberration diagrams in the other examples that follow.

[0088] As can be seen from each aberration diagram, the optical system 1 according to Example 1 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with suppressed chromatic aberration and the like across the entire screen. Also, in the telephoto range, a good quality image is obtained while fully demonstrating the image stabilization effect.

[0089] [Example 2] [Table 4] shows basic lens data of Example 2 in which specific values ​​are applied to the optical system 2 shown in Fig. 5. [Table 5] also shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 6] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0090] In the optical system 2 according to Example 2, the first lens group GR1 is composed of seven lenses, L11 to L17, in that order from the object side to the image side. The maximum air space on the optical axis within the first lens group GR1 is between the lenses L11 and L12.

[0091] In the optical system 2 according to Example 2, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has positive refractive power as a whole, and moves toward the object side when focusing from infinity to a close distance.

[0092] In the optical system 2 according to Example 2, the third lens group GR3 is composed of lenses L31 to L43, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 and L32. The 3b group GR3b is composed of lenses L33 to L35. The 3c group GR3c is composed of lenses L36 to L43. The third lens group GR3 has negative refractive power as a whole group.

[0093] [Table 4]

[0094] [Table 5]

[0095] [Table 6]

[0096] Fig. 6 shows longitudinal aberration when focusing on infinity in the optical system 2 according to Example 2. Fig. 7 and Fig. 8 show transverse aberration when focusing on infinity in the optical system 2 according to Example 2.

[0097] As can be seen from each aberration diagram, the optical system 2 according to Example 2 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with suppressed chromatic aberration and the like across the entire screen. Also, in the telephoto range, a good quality image is obtained while providing a sufficient image stabilization effect.

[0098] [Example 3] [Table 7] shows basic lens data of Example 3 in which specific values ​​are applied to the optical system 3 shown in Fig. 9. [Table 8] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 9] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0099] In the optical system 3 according to Example 3, the first lens group GR1 is composed of seven lenses, lenses L11 to L17, in that order from the object side to the image side. The maximum air space on the optical axis within the first lens group GR1 is between the lenses L11 and L12.

[0100] In the optical system 3 according to Example 3, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has positive refractive power as a whole, and moves toward the object side when focusing from infinity to a close distance.

[0101] In the optical system 3 according to Example 3, the third lens group GR3 is composed of lenses L31 to L44, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 and L32. The 3b group GR3b is composed of lenses L33 to L35. The 3c group GR3c is composed of lenses L36 to L44. The third lens group GR3 has negative refractive power as a whole group.

[0102] [Table 7]

[0103] [Table 8]

[0104] [Table 9]

[0105] Fig. 10 shows longitudinal aberration when focusing on infinity in the optical system 3 according to Example 3. Fig. 11 and Fig. 12 show transverse aberration when focusing on infinity in the optical system 3 according to Example 3.

[0106] As can be seen from each aberration diagram, the optical system 3 according to Example 3 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with suppressed chromatic aberration and the like across the entire screen. Also, in the telephoto range, a good quality image is obtained while providing a sufficient image stabilization effect.

[0107] [Example 4] [Table 10] shows basic lens data of Example 4 in which specific values ​​are applied to the optical system 4 shown in Fig. 13. [Table 11] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 12] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0108] In the optical system 4 according to Example 4, the first lens group GR1 is composed of seven lenses, L11 to L17, in that order from the object side to the image side. The maximum air space on the optical axis within the first lens group GR1 is between the lenses L11 and L12.

[0109] In the optical system 4 according to Example 4, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has positive refractive power as a whole, and moves toward the object side when focusing from infinity to a close distance.

[0110] In the optical system 4 according to Example 4, the third lens group GR3 is composed of lenses L31 to L44, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 and L32. The 3b group GR3b is composed of lenses L33 to L35. The 3c group GR3c is composed of lenses L36 to L44. The third lens group GR3 has negative refractive power as a whole group.

[0111] [Table 10]

[0112] [Table 11]

[0113] [Table 12]

[0114] Fig. 14 shows longitudinal aberration when the optical system 4 according to Example 4 is focused on an object at infinity. Fig. 15 and Fig. 16 show transverse aberration when the optical system 4 according to Example 4 is focused on an object at infinity.

[0115] As can be seen from each aberration diagram, the optical system 4 according to Example 4 is lightweight and has a center of gravity close to the imaging surface, making it easy to turn around, and provides good optical performance with chromatic aberration and other aberrations suppressed across the entire screen. Also, in the telephoto range, a good quality image is obtained while providing a sufficient image stabilization effect.

[0116] [Example 5] [Table 13] shows basic lens data of Example 5, in which specific values ​​are applied to the optical system 5 shown in Fig. 17. [Table 14] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 15] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0117] In the optical system 5 according to Example 5, the first lens group GR1 is composed of seven lenses, L11 to L17, in that order from the object side to the image side. The maximum air space on the optical axis in the first lens group GR1 is between the lenses L11 and L12.

[0118] In the optical system 5 according to Example 5, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has positive refractive power as a whole, and moves toward the object side when focusing from infinity to a close distance.

[0119] In the optical system 5 according to the fifth embodiment, the third lens group GR3 is composed of lenses L31 to L43, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 and L32. The 3b group GR3b is composed of lenses L33 to L35. The 3c group GR3c is composed of lenses L36 to L43. The third lens group GR3 has negative refractive power as a whole group.

[0120] [Table 13]

[0121] [Table 14]

[0122] [Table 15]

[0123] Fig. 18 shows longitudinal aberration when focusing on infinity in the optical system 5 according to Example 5. Fig. 19 and Fig. 20 show transverse aberration when focusing on infinity in the optical system 5 according to Example 5.

[0124] As can be seen from each aberration diagram, the optical system 5 according to Example 5 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with chromatic aberration and the like suppressed over the entire screen. Also, in the telephoto range, a good quality image is obtained while fully demonstrating the image stabilization effect.

[0125] [Example 6] [Table 16] shows basic lens data of Example 6 in which specific values ​​are applied to the optical system 6 shown in Fig. 21. [Table 17] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 18] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0126] In the optical system 6 according to Example 6, the first lens group GR1 is composed of seven lenses, L11 to L17, in that order from the object side to the image side. The maximum air space on the optical axis within the first lens group GR1 is between the lenses L11 and L12.

[0127] In the optical system 6 according to Example 6, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has positive refractive power as a whole, and moves toward the object side during focusing from infinity to a close distance.

[0128] In the optical system 6 according to Example 6, the third lens group GR3 is composed of lenses L31 to L45, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 and L32. The 3b group GR3b is composed of lenses L33 to L35. The 3c group GR3c is composed of lenses L36 to L45. The third lens group GR3 has negative refractive power as a whole group.

[0129] [Table 16]

[0130] [Table 17]

[0131] [Table 18]

[0132] Fig. 22 shows longitudinal aberration when the optical system 6 according to Example 6 is focused on an object at infinity. Fig. 23 and Fig. 24 show transverse aberration when the optical system 6 according to Example 6 is focused on an object at infinity.

[0133] As can be seen from each aberration diagram, the optical system 6 according to Example 6 is lightweight and has a center of gravity close to the imaging surface, making it easy to turn around, and provides good optical performance with chromatic aberration and other aberrations suppressed over the entire screen. Also, in the telephoto range, a good quality image is obtained while fully demonstrating the image stabilization effect.

[0134] [Example 7] [Table 19] shows basic lens data of Example 7 in which specific values ​​are applied to the optical system 7 shown in Fig. 25. [Table 20] shows the focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) values ​​when focusing at infinity. [Table 21] shows the surface spacing values ​​that are variable when focusing at infinity and when focusing at close range.

[0135] In the optical system 7 according to Example 7, the first lens group GR1 is composed of six lenses, lenses L11 to L16, in that order from the object side to the image side. The maximum air space on the optical axis within the first lens group GR1 is between the lenses L11 and L12.

[0136] In the optical system 7 according to Example 7, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has negative refractive power as a whole, and moves toward the image surface during focusing from infinity to a close distance.

[0137] In the optical system 7 according to Example 7, the third lens group GR3 is composed of lenses L31 to L45, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 to L34. The 3b group GR3b is composed of lenses L35 to L37. The 3c group GR3c is composed of lenses L38 to L45. The third lens group GR3 has negative refractive power as a whole group.

[0138] [Table 19]

[0139] [Table 20]

[0140] [Table 21]

[0141] Fig. 26 shows longitudinal aberration when the optical system 7 according to Example 7 is focused on an object at infinity. Fig. 27 and Fig. 28 show transverse aberration when the optical system 7 according to Example 7 is focused on an object at infinity.

[0142] As can be seen from each aberration diagram, the optical system 7 according to Example 7 is lightweight and has a center of gravity close to the imaging surface, making it easy to turn around, and provides good optical performance with chromatic aberration and other aberrations suppressed across the entire screen. Also, in the telephoto range, a good quality image is obtained while fully demonstrating the image stabilization effect.

[0143] [Example 8] [Table 22] shows basic lens data of Example 8, in which specific values ​​are applied to the optical system 8 shown in Fig. 29. [Table 23] also shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 24] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0144] In the optical system 8 according to Example 8, the first lens group GR1 is composed of six lenses, lenses L11 to L16, in that order from the object side to the image side. The maximum air space on the optical axis in the first lens group GR1 is between the lenses L11 and L12.

[0145] In the optical system 8 according to Example 8, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has negative refractive power as a whole, and moves toward the image surface when focusing from infinity to a close distance.

[0146] In the optical system 8 according to Example 8, the third lens group GR3 is composed of lenses L31 to L46, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 to L34. The 3b group GR3b is composed of lenses L35 to L37. The 3c group GR3c is composed of lenses L38 to L46. The third lens group GR3 has negative refractive power as a whole group.

[0147] [Table 22]

[0148] [Table 23]

[0149] [Table 24]

[0150] Fig. 30 shows longitudinal aberration when the optical system 8 according to Example 8 is focused on an object at infinity. Fig. 31 and Fig. 32 show transverse aberration when the optical system 8 according to Example 8 is focused on an object at infinity.

[0151] As can be seen from each aberration diagram, the optical system 8 according to Example 8 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with suppressed chromatic aberration and the like across the entire screen. Also, in the telephoto range, a good quality image is obtained while providing a sufficient image stabilization effect.

[0152] [Example 9] [Table 25] shows basic lens data of Example 9 in which specific values ​​are applied to the optical system 9 shown in Fig. 33. [Table 26] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 27] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0153] In the optical system 9 according to Example 9, the first lens group GR1 is composed of six lenses, lenses L11 to L16, in that order from the object side to the image side. The maximum air space on the optical axis in the first lens group GR1 is between the lenses L11 and L12.

[0154] In the optical system 9 according to Example 9, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has negative refractive power as a whole, and moves toward the image surface during focusing from infinity to a close distance.

[0155] In the optical system 9 according to Example 9, the third lens group GR3 is composed of lenses L31 to L46, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 to L34. The 3b group GR3b is composed of lenses L35 to L37. The 3c group GR3c is composed of lenses L38 to L46. The third lens group GR3 has negative refractive power as a whole group.

[0156] [Table 25]

[0157] [Table 26]

[0158] [Table 27]

[0159] Fig. 34 shows longitudinal aberration in the optical system 9 according to Example 9 when focused on an object at infinity. Fig. 35 and Fig. 36 show transverse aberration in the optical system 9 according to Example 9 when focused on an object at infinity.

[0160] As can be seen from each aberration diagram, the optical system 9 according to Example 9 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with suppressed chromatic aberration and the like across the entire screen. Also, in the telephoto range, a good quality image is obtained while providing a sufficient image stabilization effect.

[0161] [Example 10] [Table 28] shows basic lens data of Example 10, in which specific values ​​are applied to the optical system 10 shown in Fig. 37. [Table 29] also shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 30] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0162] In the optical system 10 according to the tenth embodiment, the first lens group GR1 is composed of six lenses, lenses L11 to L16, in that order from the object side to the image side. The maximum air space on the optical axis in the first lens group GR1 is between the lenses L11 and L12.

[0163] In the optical system 10 according to Example 10, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has negative refractive power as a whole, and moves toward the image side when focusing from infinity to a close distance.

[0164] In the optical system 10 according to Example 10, the third lens group GR3 is composed of lenses L31 to L46, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 to L34. The 3b group GR3b is composed of lenses L35 to L37. The 3c group GR3c is composed of lenses L38 to L46. The third lens group GR3 has negative refractive power as a whole group.

[0165] [Table 28]

[0166] [Table 29]

[0167] [Table 30]

[0168] Fig. 38 shows longitudinal aberration when the optical system 10 according to Example 10 is focused on an object at infinity. Fig. 39 and Fig. 40 show transverse aberration when the optical system 10 according to Example 10 is focused on an object at infinity.

[0169] As can be seen from each aberration diagram, the optical system 10 according to Example 10 is lightweight, has a center of gravity close to the imaging surface, is easy to turn, and provides good optical performance with chromatic aberration and the like suppressed over the entire screen. Also, in the telephoto range, a good quality image is obtained while fully demonstrating the image stabilization effect.

[0170] [Example 11] [Table 31] shows basic lens data of Example 11, in which specific values ​​are applied to the optical system 11 shown in Fig. 41. [Table 32] shows values ​​of focal length (f), F-number (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus (BF) when focusing at infinity. [Table 33] shows values ​​of surface spacing that are variable when focusing at infinity and when focusing at close range.

[0171] In the optical system 11 according to Example 11, the first lens group GR1 is composed of six lenses, lenses L11 to L16, in that order from the object side to the image side. The maximum air space on the optical axis in the first lens group GR1 is between the lenses L11 and L12.

[0172] In the optical system 11 according to Example 11, the second lens group GR2 is composed of a cemented lens including, in order from the object side to the image side, a lens L21 and a lens L22. The second lens group GR2 has negative refractive power as a whole, and moves to the image side when focusing from infinity to a close distance.

[0173] In the optical system 11 according to Example 11, the third lens group GR3 is composed of lenses L31 to L46, in that order from the object side to the image side. The 3a group GR3a is composed of lenses L31 to L34. The 3b group GR3b is composed of lenses L35 to L37. The 3c group GR3c is composed of lenses L38 to L46. The third lens group GR3 has positive refractive power as a whole group.

[0174] [Table 31]

[0175] [Table 32]

[0176] [Table 33]

[0177] Fig. 42 shows longitudinal aberration in the optical system 11 according to Example 11 when focused on an object at infinity. Fig. 43 and Fig. 44 show transverse aberration in the optical system 11 according to Example 11 when focused on an object at infinity.

[0178] As can be seen from each aberration diagram, the optical system 11 according to Example 11 is lightweight, has a center of gravity close to the imaging surface, and is easy to turn, and provides good optical performance with chromatic aberration and the like suppressed over the entire screen. Also, in the telephoto range, a good quality image is obtained while fully demonstrating the image stabilization effect.

[0179] [Other numerical data for each example] [Tables 34] to [Table 41] show the values ​​for each of the above conditional expressions for each example. [Tables 34] to [Table 41] also list the lenses that meet each conditional expression along with the numerical values, as appropriate. As can be seen from [Tables 34] to [Table 41], the values ​​for each example are within the numerical range for each conditional expression.

[0180] [Table 34]

[0181] [Table 35]

[0182] [Table 36]

[0183] [Table 37]

[0184] [Table 38]

[0185] [Table 39]

[0186] [Table 40]

[0187] [Table 41]

[0188] <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, an agricultural machine (tractor), etc.

[0189] Fig. 46 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. 46, 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 CAN (Controller Area Network), LIN (Local Interconnect Network), LAN (Local Area Network), or FlexRay (registered trademark).

[0190] Each control unit includes a microcomputer that performs arithmetic processing according to various programs, a storage 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 by wired communication or wireless communication. In FIG. 46, 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 storage unit 7690 are illustrated as the functional configuration of the integrated control unit 7600. Other control units also include a microcomputer, a communication I / F, a storage unit, and the like.

[0191] The drivetrain control unit 7100 controls the operation of devices related to the drivetrain of the vehicle according to various programs. For example, the drivetrain control unit 7100 functions as a control device for a drive force generating device for generating a drive force of the vehicle, such as an internal combustion engine or a drive motor, a drive force transmission mechanism for transmitting the drive force to the wheels, a steering mechanism for adjusting the steering angle of the vehicle, and a braking device for generating a braking force of the vehicle. The drivetrain control unit 7100 may also function as a control device such as an ABS (Antilock Brake System) or an ESC (Electronic Stability Control).

[0192] A vehicle state detection unit 7110 is connected to the drive system 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 for detecting the amount of operation of an accelerator pedal, the amount of operation of a brake pedal, the steering angle of a steering wheel, the engine rotation speed, or the rotation speed of wheels, for example. The drive system 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.

[0193] The body system control unit 7200 controls the operation of various devices mounted on the vehicle body according to various programs. For example, the 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, back lamps, brake lamps, turn signals, and fog lamps. In this case, radio waves or signals of various switches transmitted from a portable device that replaces a key may be input to the body system control unit 7200. The body system control unit 7200 receives the input of these radio waves or signals and controls the door lock device, power window device, lamps, and the like of the vehicle.

[0194] The battery control unit 7300 controls the secondary battery 7310, which is a power supply source for the drive motor, according to various programs. For example, information such as battery temperature, battery output voltage, or remaining capacity of the battery is input to the battery control unit 7300 from a battery device equipped with the secondary battery 7310. The battery control unit 7300 performs calculation processing using these signals, and controls the temperature regulation of the secondary battery 7310 or controls a cooling device or the like equipped in the battery device.

[0195] 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, and the like around the vehicle equipped with the vehicle control system 7000.

[0196] 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 be provided as independent sensors or devices, or may be provided as a device in which multiple sensors or devices are integrated.

[0197] Here, FIG. 47 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 in the vehicle interior 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 in the vehicle interior 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 in the vehicle interior is mainly used to detect a preceding vehicle, a pedestrian, an obstacle, a traffic light, a traffic sign, a lane, or the like.

[0198] 47 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, and imaging range d indicates the imaging range of the imaging unit 7916 provided on the rear bumper or back door. For example, image data captured by the imaging units 7910, 7912, 7914, and 7916 are superimposed to obtain an overhead image of the vehicle 7900 viewed from above.

[0199] The outside information detection units 7920, 7922, 7924, 7926, 7928, and 7930 provided on the front, rear, sides, and corners of the vehicle 7900 and on the upper part of the windshield inside the vehicle cabin may be, for example, ultrasonic sensors or radar devices. The outside information detection units 7920, 7926, and 7930 provided on the front nose, rear bumper, back door, and on the upper part of the windshield inside the vehicle cabin of the vehicle 7900 may be, for example, LIDAR devices. These outside information detection units 7920 to 7930 are mainly used to detect preceding vehicles, pedestrians, obstacles, and the like.

[0200] Returning to FIG. 46, the description 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 outside-vehicle information detection unit 7420 connected thereto. When 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 transmits 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, or characters on the road surface, based on the received information. The outside-vehicle information detection unit 7400 may perform environment recognition processing for recognizing rainfall, fog, road surface conditions, and the like, based on the received information. The outside-vehicle information detection unit 7400 may calculate the distance to an object outside the vehicle based on the received information.

[0201] Furthermore, the outside vehicle information detection unit 7400 may perform image recognition processing or distance detection processing to recognize people, cars, obstacles, signs, or characters on the road surface, based on the received image data. The outside vehicle information detection unit 7400 may perform processing such as distortion correction or position adjustment on the received image data, and may generate an overhead image or a panoramic image by synthesizing image data captured by different imaging units 7410. The outside vehicle information detection unit 7400 may perform viewpoint conversion processing using image data captured by different imaging units 7410.

[0202] The in-vehicle information detection unit 7500 detects information inside the vehicle. For example, a driver state detection unit 7510 that detects the state of the driver is connected to the in-vehicle information detection unit 7500. The driver state detection unit 7510 may include a camera that captures an image of the driver, a biosensor that detects the bioinformation of the driver, or a microphone that collects sound in the vehicle cabin. The biosensor is provided, for example, on the seat or steering wheel, and detects the bioinformation of a passenger sitting in the seat or a driver gripping the steering wheel. The in-vehicle information detection unit 7500 may calculate the degree of fatigue or concentration of the driver based on the detection information input from the driver state detection unit 7510, or may determine whether the driver is dozing. The in-vehicle information detection unit 7500 may perform processing such as noise canceling processing on the collected sound signal.

[0203] The integrated control unit 7600 controls the overall operation of the vehicle control system 7000 according to various programs. The input unit 7800 is connected to the integrated control unit 7600. The input unit 7800 is realized by a device that can be operated by an occupant to input, such as a touch panel, a button, a microphone, a switch, or a lever. Data obtained by voice recognition of a voice input by 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 PDA (Personal Digital Assistant) that supports the operation of the vehicle control system 7000. The input unit 7800 may be, for example, a camera, in which case the occupant can input information by gestures. Alternatively, data obtained by detecting the movement of a wearable device worn by the occupant 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 occupant using the above-mentioned input unit 7800 and outputs the input signal to the integrated control unit 7600. A passenger or the like operates the input unit 7800 to input various data to the vehicle control system 7000 and to instruct processing operations.

[0204] 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 be realized by a magnetic storage device such as an HDD (Hard Disc Drive), a semiconductor storage device, an optical storage device, or a magneto-optical storage device, etc.

[0205] 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 (registered trademark), WiMAX (registered trademark), LTE (registered trademark) (Long Term Evolution) or LTE-Advanced (LTE-A), or other wireless communication protocols such as wireless LAN (also called Wi-Fi (registered trademark)) and Bluetooth (registered trademark). The general-purpose communication I / F 7620 may connect to a device (e.g., an application server or a control server) present on an external network (e.g., the Internet, a cloud network, or a carrier-specific network) via, for example, a base station or an access point. The general-purpose communication I / F 7620 may also connect to a terminal (e.g., a driver's, pedestrian's, or store's terminal, or a Machine Type Communication (MTC) terminal) present in the vicinity of the vehicle using, for example, a Peer To Peer (P2P) technology.

[0206] The dedicated communication I / F 7630 is a communication I / F that supports a communication protocol designed for use in a vehicle. 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 a higher layer IEEE1609, DSRC (Dedicated Short Range Communications), 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.

[0207] The positioning unit 7640 performs positioning by receiving, for example, a GNSS signal from a Global Navigation Satellite System (GNSS) satellite (for example, a GPS signal from a Global Positioning System (GPS) satellite) and generates position information including the latitude, longitude, and altitude of the vehicle. 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 having a positioning function.

[0208] The beacon receiving unit 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 closure, required time, etc. The function of the beacon receiving unit 7650 may be included in the dedicated communication I / F 7630 described above.

[0209] The in-vehicle device I / F 7660 is a communication interface that mediates a connection 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 at least one of a mobile device or a wearable device owned by a passenger, or an information device carried or attached to a vehicle. The in-vehicle device 7760 may also include a navigation device that searches for a route to an arbitrary destination. The in-vehicle equipment I / F 7660 exchanges control signals and data signals with these in-vehicle equipment 7760.

[0210] 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.

[0211] The microcomputer 7610 of the integrated control unit 7600 controls the vehicle control system 7000 according to various programs based on information acquired through 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 a control target value of a driving force generating device, a steering mechanism, or a braking device based on the acquired information inside and outside the vehicle, and output a control command to the drive system control unit 7100. For example, the microcomputer 7610 may perform cooperative control for the purpose of realizing the functions of an ADAS (Advanced Driver Assistance System), including vehicle collision avoidance or impact mitigation, following driving based on the distance between vehicles, 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.

[0212] 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 peripheral information of the current position of the vehicle, 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. The microcomputer 7610 may also predict dangers such as vehicle collisions, the approach of pedestrians, 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.

[0213] The audio / image output unit 7670 transmits at least one of audio and image output signals to an output device capable of visually or audibly notifying the passengers of the vehicle or the outside of the vehicle of information. In the example of FIG. 46, an audio speaker 7710, a display unit 7720, and an instrument panel 7730 are illustrated as output devices. The display unit 7720 may include at least one of an on-board display and a head-up display, for example. The display unit 7720 may have an AR (Augmented Reality) display function. The output device may be other devices such as headphones, a wearable device such as a glasses-type display worn by the passenger, a projector, or a lamp, other than these devices. When the output device is a display device, the display device visually displays the results obtained by various processes performed by the microcomputer 7610 or information received from other control units in various formats such as text, image, table, graph, etc. When the output device is an audio output device, the audio output device converts an audio signal consisting of reproduced audio data or acoustic data into an analog signal and audibly outputs it.

[0214] In the example shown in FIG. 46, 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 any control unit may be provided by another control unit. In other words, as long as information is transmitted and received via the communication network 7010, a predetermined arithmetic processing may be performed by any control unit. Similarly, a sensor or device connected to any control unit may be connected to another control unit, and multiple control units may transmit and receive detection information to each other via the communication network 7010.

[0215] In the vehicle control system 7000 described above, the optical system 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.

[0216] [5.2 Second application example] The technology disclosed herein may be applied to an endoscopic surgery system.

[0217] Fig. 48 is a diagram showing an example of a schematic configuration of an endoscopic surgery system 5000 to which the technology according to the present disclosure can be applied. Fig. 48 shows a state in which an operator (doctor) 5067 performs surgery on a patient 5071 on a patient bed 5069 using the endoscopic surgery system 5000. As shown in the figure, the endoscopic surgery system 5000 is composed of an endoscope 5001, other surgical tools 5017, a support arm device 5027 that supports the endoscope 5001, and a cart 5037 on which various devices for endoscopic surgery are mounted.

[0218] In endoscopic surgery, instead of cutting the abdominal wall to open the abdomen, a cylindrical opening instrument called trocar 5025a to 5025d is punctured into the abdominal wall. Then, the lens barrel 5003 of the endoscope 5001 and other surgical instruments 5017 are inserted into the body cavity of the patient 5071 from the trocar 5025a to 5025d. In the illustrated example, as the other surgical instruments 5017, a pneumoperitoneum tube 5019, an energy treatment instrument 5021, and forceps 5023 are inserted into the body cavity of the patient 5071. The energy treatment instrument 5021 is a treatment instrument that performs incision and peeling of tissue, sealing of blood vessels, etc. by high-frequency current or ultrasonic vibration. However, the illustrated surgical instrument 5017 is merely an example, and various surgical instruments generally used in endoscopic surgery, such as a suction cup and a retractor, may be used as the surgical instrument 5017.

[0219] An image of the operation site in the body cavity of the patient 5071 photographed by the endoscope 5001 is displayed on the display device 5041. The surgeon 5067 performs treatment such as excising the affected area using the energy treatment tool 5021 and the forceps 5023 while viewing the image of the operation site displayed on the display device 5041 in real time. Although not shown in the figure, the pneumoperitoneum tube 5019, the energy treatment tool 5021, and the forceps 5023 are supported by the surgeon 5067 or an assistant during surgery.

[0220] (Support arm device) The support arm device 5027 includes an arm portion 5031 extending from a base portion 5029. In the example shown, the arm portion 5031 is composed of joint portions 5033a, 5033b, and 5033c and links 5035a and 5035b, and is driven under the control of an arm control device 5045. The arm portion 5031 supports the endoscope 5001, and controls its position and attitude. This allows the endoscope 5001 to be stably fixed in position.

[0221] (Endoscopy) The endoscope 5001 is composed of a lens barrel 5003, a region of a predetermined length from the tip of which is inserted into a body cavity of a patient 5071, and a camera head 5005 connected to the base end of the lens barrel 5003. In the illustrated example, the endoscope 5001 is configured as a so-called rigid lens barrel having a rigid lens barrel 5003, but the endoscope 5001 may be configured as a so-called flexible lens barrel having a flexible lens barrel 5003.

[0222] An opening into which an objective lens is fitted is provided at the tip of the lens barrel 5003. A light source device 5043 is connected to the endoscope 5001, and light generated by the light source device 5043 is guided to the tip of the lens barrel by a light guide extending inside the lens barrel 5003, and is irradiated via the objective lens toward an observation target in the body cavity of the patient 5071. The endoscope 5001 may be a direct-viewing endoscope, an oblique-viewing endoscope, or a side-viewing endoscope.

[0223] An optical system and an imaging element are provided inside the camera head 5005, and reflected light (observation light) from an observation target is collected on the imaging element by the optical system. The imaging element photoelectrically converts the observation light to generate an electrical signal corresponding to the observation light, i.e., an image signal corresponding to an observation image. The image signal is transmitted to a camera control unit (CCU) 5039 as RAW data. The camera head 5005 is equipped with a function for adjusting the magnification and focal length by appropriately driving the optical system.

[0224] For example, to support stereoscopic vision (3D display), a plurality of imaging elements may be provided in the camera head 5005. In this case, a plurality of relay optical systems are provided inside the lens barrel 5003 to guide observation light to each of the plurality of imaging elements.

[0225] (Various devices mounted on the cart) The CCU 5039 is configured with a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), etc., and performs overall control of the operations of the endoscope 5001 and the display device 5041. Specifically, the CCU 5039 performs various image processing, such as development processing (demosaic processing), on the image signal received from the camera head 5005 in order to display an image based on the image signal. The CCU 5039 provides the image signal that has been subjected to the image processing to the display device 5041. The CCU 5039 also transmits a control signal to the camera head 5005 to control its drive. The control signal may include information on imaging conditions, such as magnification and focal length.

[0226] The display device 5041 displays an image based on an image signal that has been subjected to image processing by the CCU 5039 under the control of the CCU 5039. When the endoscope 5001 is compatible with high-resolution imaging such as 4K (3840 horizontal pixels x 2160 vertical pixels) or 8K (7680 horizontal pixels x 4320 vertical pixels) and / or compatible with 3D display, the display device 5041 may be capable of displaying high resolution and / or 3D display, respectively. When compatible with high-resolution imaging such as 4K or 8K, a display device 5041 with a size of 55 inches or more can be used to provide a more immersive feeling. In addition, multiple display devices 5041 with different resolutions and sizes may be provided depending on the application.

[0227] The light source device 5043 is composed of a light source such as an LED (light emitting diode) and supplies the endoscope 5001 with irradiation light when photographing the surgical site.

[0228] The arm control device 5045 is constituted by a processor such as a CPU, and operates according to a prescribed program to control the driving of the arm portion 5031 of the support arm device 5027 according to a prescribed control method.

[0229] The input device 5047 is an input interface for the endoscopic surgery system 5000. A user can input various information and instructions to the endoscopic surgery system 5000 via the input device 5047. For example, the user inputs various information related to surgery, such as physical information of a patient and information about a surgical procedure, via the input device 5047. In addition, for example, the user inputs, via the input device 5047, an instruction to drive the arm unit 5031, an instruction to change the imaging conditions (type of irradiation light, magnification, focal length, etc.) of the endoscope 5001, an instruction to drive the energy treatment tool 5021, etc.

[0230] The type of the input device 5047 is not limited, and the input device 5047 may be any of various known input devices. For example, a mouse, a keyboard, a touch panel, a switch, a foot switch 5057, and / or a lever may be applied as the input device 5047. When a touch panel is used as the input device 5047, the touch panel may be provided on a display surface of the display device 5041.

[0231] Alternatively, the input device 5047 is a device worn by the user, such as a glasses-type wearable device or a head mounted display (HMD), and various inputs are made according to the user's gestures and gaze detected by these devices. The input device 5047 also includes a camera capable of detecting the user's movements, and various inputs are made according to the user's gestures and gaze detected from the image captured by the camera. The input device 5047 also includes a microphone capable of collecting the user's voice, and various inputs are made by voice via the microphone. In this way, the input device 5047 is configured to be able to input various information in a non-contact manner, and thus it becomes possible for a user (e.g., the surgeon 5067) belonging to a clean area to operate a device belonging to an unclean area in a non-contact manner. In addition, the user can operate the device without taking his / her hands off the surgical tool he / she is holding, which improves the user's convenience.

[0232] The treatment tool control device 5049 controls the driving of the energy treatment tool 5021 for cauterizing tissue, incising, sealing blood vessels, etc. The insufflation device 5051 sends gas into the body cavity of the patient 5071 through the insufflation tube 5019 in order to secure the field of view of the endoscope 5001 and the working space of the surgeon. The recorder 5053 is a device capable of recording various information related to the surgery. The printer 5055 is a device capable of printing various information related to the surgery in various formats such as text, image, or graph.

[0233] Below, the particularly characteristic configuration of the endoscopic surgery system 5000 will be described in further detail.

[0234] (Support arm device) The support arm device 5027 includes a base 5029, which is a base, and an arm 5031 extending from the base 5029. In the illustrated example, the arm 5031 includes a plurality of joints 5033a, 5033b, and 5033c, and a plurality of links 5035a and 5035b connected by the joint 5033b. However, in FIG. 48, for the sake of simplicity, the configuration of the arm 5031 is simplified. In practice, the shapes, number, and arrangement of the joints 5033a to 5033c and the links 5035a and 5035b, as well as the directions of the rotation axes of the joints 5033a to 5033c, can be appropriately set so that the arm 5031 has a desired degree of freedom. For example, the arm 5031 can be preferably configured to have six or more degrees of freedom. This allows the endoscope 5001 to be moved freely within the movable range of the arm portion 5031, making it possible to insert the lens barrel 5003 of the endoscope 5001 into the body cavity of the patient 5071 from a desired direction.

[0235] The joints 5033a to 5033c are provided with actuators, and the joints 5033a to 5033c are configured to be rotatable around a predetermined rotation axis by driving the actuators. The drive of the actuators is controlled by the arm control device 5045, whereby the rotation angles of the joints 5033a to 5033c are controlled, and the drive of the arm unit 5031 is controlled. This allows control of the position and attitude of the endoscope 5001. At this time, the arm control device 5045 can control the drive of the arm unit 5031 by various known control methods such as force control or position control.

[0236] For example, the surgeon 5067 may appropriately input an operation via the input device 5047 (including the foot switch 5057), and the drive of the arm unit 5031 may be appropriately controlled by the arm control device 5045 in response to the operation input, thereby controlling the position and posture of the endoscope 5001. Through this control, the endoscope 5001 at the tip of the arm unit 5031 may be moved from one position to another, and then fixedly supported at the position after the movement. The arm unit 5031 may be operated in a so-called master-slave manner. In this case, the arm unit 5031 may be remotely operated by a user via the input device 5047 installed in a location away from the operating room.

[0237] Furthermore, when force control is applied, the arm control device 5045 may perform so-called power assist control, in which the actuators of the joints 5033a to 5033c are driven so that the arm unit 5031 moves smoothly in response to an external force from the user. This allows the arm unit 5031 to be moved with a relatively light force when the user moves the arm unit 5031 while directly touching the arm unit 5031. This makes it possible to move the endoscope 5001 more intuitively and with a simpler operation, improving user convenience.

[0238] Generally, in endoscopic surgery, the endoscope 5001 is supported by a doctor called a scopist. By contrast, by using the support arm device 5027, the position of the endoscope 5001 can be fixed more reliably without relying on human hands, so that an image of the surgical site can be obtained stably and the surgery can be performed smoothly.

[0239] The arm control device 5045 does not necessarily have to be provided on the cart 5037. Also, the arm control device 5045 does not necessarily have to be one device. For example, the arm control device 5045 may be provided on each of the joints 5033a to 5033c of the arm section 5031 of the support arm device 5027, and the drive control of the arm section 5031 may be realized by the multiple arm control devices 5045 cooperating with each other.

[0240] (Light source device) The light source device 5043 supplies the endoscope 5001 with irradiation light for photographing the surgical site. The light source device 5043 is composed of a white light source composed of, for example, an LED, a laser light source, or a combination of these. In this case, when the white light source is composed of a combination of RGB laser light sources, the output intensity and output timing of each color (each wavelength) can be controlled with high precision, so that the light source device 5043 can adjust the white balance of the captured image. In this case, it is also possible to capture images corresponding to each of the RGB colors in a time-division manner by irradiating the observation target with laser light from each of the RGB laser light sources in a time-division manner and controlling the driving of the image sensor of the camera head 5005 in synchronization with the irradiation timing. According to this method, a color image can be obtained without providing a color filter to the image sensor.

[0241] Furthermore, the light source device 5043 may be controlled to change the intensity of the light it outputs at predetermined time intervals. By controlling the driving of the image sensor of the camera head 5005 in synchronization with the timing of the change in the light intensity to obtain images in a time-division manner and synthesizing the images, it is possible to generate an image with a high dynamic range that is free of so-called blocked-up shadows and blown-out highlights.

[0242] The light source device 5043 may be configured to supply light of a predetermined wavelength band corresponding to the special light observation. In the special light observation, for example, by utilizing the wavelength dependency of light absorption in body tissue, a narrow band light is irradiated compared to the irradiated light (i.e., white light) during normal observation, and a predetermined tissue such as blood vessels on the mucous membrane surface is photographed with high contrast, so-called narrow band imaging is performed. Alternatively, in the special light observation, a fluorescent observation may be performed in which an image is obtained by fluorescence generated by irradiating an excitation light. In the fluorescent observation, an excitation light is irradiated to a body tissue and the fluorescence from the body tissue is observed (autofluorescence observation), or a reagent such as indocyanine green (ICG) is locally injected into the body tissue and an excitation light corresponding to the fluorescence wavelength of the reagent is irradiated to the body tissue to obtain a fluorescent image. The light source device 5043 may be configured to supply narrow band light and / or excitation light corresponding to such special light observation.

[0243] (Camera head and CCU) The functions of the camera head 5005 and the CCU 5039 of the endoscope 5001 will be described in more detail with reference to Fig. 49. Fig. 49 is a block diagram showing an example of the functional configuration of the camera head 5005 and the CCU 5039 shown in Fig. 48.

[0244] 49, the camera head 5005 has, as its functions, a lens unit 5007, an imaging unit 5009, a drive unit 5011, a communication unit 5013, and a camera head control unit 5015. The CCU 5039 has, as its functions, a communication unit 5059, an image processing unit 5061, and a control unit 5063. The camera head 5005 and the CCU 5039 are connected by a transmission cable 5065 so as to be able to communicate in both directions.

[0245] First, the functional configuration of the camera head 5005 will be described. The lens unit 5007 is an optical system provided at a connection portion with the lens barrel 5003. Observation light taken in from the tip of the lens barrel 5003 is guided to the camera head 5005 and enters the lens unit 5007. The lens unit 5007 is configured by combining a plurality of lenses including a zoom lens and a focus lens. The optical characteristics of the lens unit 5007 are adjusted so as to focus the observation light on the light receiving surface of the image pickup element of the image pickup section 5009. In addition, the zoom lens and the focus lens are configured so that their positions on the optical axis can be moved in order to adjust the magnification and focus of the captured image.

[0246] The imaging unit 5009 is composed of an imaging element, and is disposed after the lens unit 5007. Observation light passing through the lens unit 5007 is collected on the light receiving surface of the imaging element, and an image signal corresponding to the observed image is generated by photoelectric conversion. The image signal generated by the imaging unit 5009 is provided to the communication unit 5013.

[0247] The imaging element constituting the imaging unit 5009 is, for example, a CMOS (Complementary Metal Oxide Semiconductor) type image sensor capable of color imaging having a Bayer array. The imaging element may be capable of capturing high-resolution images of, for example, 4K or higher. By obtaining a high-resolution image of the surgical site, the surgeon 5067 can grasp the state of the surgical site in more detail, and the surgery can proceed more smoothly.

[0248] The imaging element constituting the imaging unit 5009 is configured to have a pair of imaging elements for acquiring image signals for the right eye and the left eye corresponding to 3D display. The 3D display enables the surgeon 5067 to more accurately grasp the depth of the biological tissue in the surgical site. When the imaging unit 5009 is configured as a multi-plate type, multiple lens units 5007 are provided corresponding to the respective imaging elements.

[0249] Furthermore, the imaging unit 5009 does not necessarily have to be provided in the camera head 5005. For example, the imaging unit 5009 may be provided inside the lens barrel 5003, immediately behind the objective lens.

[0250] The driving section 5011 is configured by an actuator, and moves the zoom lens and focus lens of the lens unit 5007 by a predetermined distance along the optical axis under the control of the camera head control section 5015. This allows the magnification and focus of the image captured by the imaging section 5009 to be appropriately adjusted.

[0251] The communication unit 5013 is configured by a communication device for transmitting and receiving various information to and from the CCU 5039. The communication unit 5013 transmits the image signal obtained from the imaging unit 5009 as RAW data to the CCU 5039 via the transmission cable 5065. At this time, in order to display the captured image of the operation site with low latency, it is preferable that the image signal is transmitted by optical communication. During surgery, the surgeon 5067 performs surgery while observing the condition of the affected area using the captured image, so that a moving image of the operation site is required to be displayed as quickly as possible in real time for a safer and more reliable surgery. When optical communication is performed, the communication unit 5013 is provided with a photoelectric conversion module that converts an electrical signal into an optical signal. The image signal is converted into an optical signal by the photoelectric conversion module and then transmitted to the CCU 5039 via the transmission cable 5065.

[0252] The communication unit 5013 also receives a control signal for controlling the driving of the camera head 5005 from the CCU 5039. The control signal includes information on imaging conditions, such as information for specifying a frame rate of an image to be captured, information for specifying an exposure value at the time of capturing an image, and / or information for specifying a magnification and a focus of an image to be captured. The communication unit 5013 provides the received control signal to the camera head control unit 5015. The control signal from the CCU 5039 may also be transmitted by optical communication. In this case, the communication unit 5013 is provided with a photoelectric conversion module for converting an optical signal into an electrical signal, and the control signal is converted into an electrical signal by the photoelectric conversion module and then provided to the camera head control unit 5015.

[0253] The image capturing conditions such as the frame rate, exposure value, magnification, and focus are automatically set by the control unit 5063 of the CCU 5039 based on the acquired image signal. That is, the endoscope 5001 is equipped with so-called AE (Auto Exposure) function, AF (Auto Focus) function, and AWB (Auto White Balance) function.

[0254] The camera head control unit 5015 controls the driving of the camera head 5005 based on a control signal received from the CCU 5039 via the communication unit 5013. For example, the camera head control unit 5015 controls the driving of the image sensor of the imaging unit 5009 based on information specifying the frame rate of the captured image and / or information specifying the exposure during imaging. Also, for example, the camera head control unit 5015 appropriately moves the zoom lens and focus lens of the lens unit 5007 via the drive unit 5011 based on information specifying the magnification and focus of the captured image. The camera head control unit 5015 may further include a function of storing information for identifying the lens barrel 5003 and the camera head 5005.

[0255] Incidentally, by arranging the components such as the lens unit 5007 and the imaging unit 5009 in a sealed structure that is highly airtight and waterproof, the camera head 5005 can be made resistant to autoclave sterilization.

[0256] Next, the functional configuration of the CCU 5039 will be described. The communication unit 5059 is configured by a communication device for transmitting and receiving various information to and from the camera head 5005. The communication unit 5059 receives an image signal transmitted from the camera head 5005 via the transmission cable 5065. At this time, as described above, the image signal can be suitably transmitted by optical communication. In this case, in correspondence with the optical communication, the communication unit 5059 is provided with a photoelectric conversion module that converts an optical signal into an electrical signal. The communication unit 5059 provides the image signal converted into an electrical signal to the image processing unit 5061.

[0257] Furthermore, the communication unit 5059 transmits, to the camera head 5005, a control signal for controlling the driving of the camera head 5005. This control signal may also be transmitted by optical communication.

[0258] The image processing unit 5061 performs various types of image processing on the image signal, which is RAW data transmitted from the camera head 5005. The image processing includes various known signal processing such as development processing, high image quality processing (band enhancement processing, super-resolution processing, NR (Noise reduction) processing, and / or camera shake correction processing, etc.), and / or enlargement processing (electronic zoom processing), etc. The image processing unit 5061 also performs detection processing on the image signal to perform AE, AF, and AWB.

[0259] The image processing unit 5061 is configured with a processor such as a CPU or a GPU, and the processor operates according to a predetermined program to perform the above-mentioned image processing and detection processing. When the image processing unit 5061 is configured with multiple GPUs, the image processing unit 5061 appropriately divides information related to the image signal and performs image processing in parallel using the multiple GPUs.

[0260] The control unit 5063 performs various controls related to the imaging of the surgical site by the endoscope 5001 and the display of the captured image. For example, the control unit 5063 generates a control signal for controlling the driving of the camera head 5005. At this time, if the imaging conditions are input by the user, the control unit 5063 generates the control signal based on the input by the user. Alternatively, if the endoscope 5001 is equipped with an AE function, an AF function, and an AWB function, the control unit 5063 appropriately calculates an optimal exposure value, focal length, and white balance according to the result of the detection process by the image processing unit 5061, and generates a control signal.

[0261] The control unit 5063 also displays an image of the surgical site on the display device 5041 based on the image signal that has been image-processed by the image processing unit 5061. At this time, the control unit 5063 recognizes various objects in the surgical site image using various image recognition techniques. For example, the control unit 5063 can recognize surgical tools such as forceps, specific living body parts, bleeding, mist when the energy treatment tool 5021 is used, and the like, by detecting the shape and color of the edges of objects included in the surgical site image. When the control unit 5063 displays the image of the surgical site on the display device 5041, it uses the recognition result to superimpose various types of surgery support information on the image of the surgical site. The surgery support information is superimposed and presented to the surgeon 5067, making it possible to proceed with the surgery more safely and reliably.

[0262] The transmission cable 5065 connecting the camera head 5005 and the CCU 5039 is an electrical signal cable corresponding to communication of electrical signals, an optical fiber corresponding to optical communication, or a composite cable of these.

[0263] In the illustrated example, the communication is performed by wire using the transmission cable 5065, but the communication between the camera head 5005 and the CCU 5039 may be performed wirelessly. When the communication between them is performed wirelessly, it becomes unnecessary to lay the transmission cable 5065 in the operating room, and therefore the situation in which the transmission cable 5065 impedes the movement of medical staff in the operating room can be eliminated.

[0264] An example of an endoscopic surgery system 5000 to which the technology according to the present disclosure can be applied has been described above. Note that, although the endoscopic surgery system 5000 has been described here as an example, the system to which the technology according to the present disclosure can be applied is not limited to this example. For example, the technology according to the present disclosure may be applied to a flexible endoscope system for inspection or a microsurgery system.

[0265] Of the configurations described above, the technology according to the present disclosure can be suitably applied to the camera head 5005. In particular, the optical system according to the present disclosure can be suitably applied to the lens unit 5007 of the camera head 5005.

[0266] <6. Other embodiments> The technology according to the present disclosure is not limited to the above-described embodiment and examples, and various modifications are possible.

[0267] For example, the shapes and numerical values ​​of each part shown in each of the above embodiments are merely examples of implementations for implementing the present technology, and the technical scope of the present technology should not be interpreted in a limiting manner based on these.

[0268] Furthermore, in the above embodiment and example, a configuration substantially consisting of three lens groups has been described, but a configuration further including a lens that has substantially no refractive power may also be used.

[0269] For example, the present technology can be configured as follows. According to the present technology having the following configuration, an overall configuration of three lens groups is used with the configuration of each lens group optimized, making it possible to realize an optical system and imaging device that are lightweight, easy to handle, and have high optical performance across the entire screen.

[0270] [1] From the object side to the image plane side, a first lens group having positive refractive power as a whole, the first lens group being fixed relative to an image plane during focusing; a second lens group that has positive or negative refractive power as a whole and moves in the optical axis direction to perform focusing from infinity to a close distance; a third lens group which is divided into groups 3a, 3b, and 3c in that order from the object side to the image surface side, and which corrects image blur by moving group 3b in a direction approximately perpendicular to the optical axis, has negative or positive refractive power as a whole, and is fixed relative to the image surface during focusing; It is composed of The following condition is satisfied: optical system. L / f<1 ……(1) D_g1max / f>0.23 ……(2) D_3bImg / f<0.24 ……(3) however, L: the distance from the surface of the first lens group closest to the object to the image plane f: focal length of the entire system when focused at infinity D_g1max: the maximum air gap on the optical axis within the first lens group D_3bImg: the distance from the surface closest to the object side of the 3b group to the image plane Let us assume that. [2] The first lens group has at least one positive lens which satisfies the following conditional expressions (4) and (5): The optical system according to [1] above. νd_1p>90 ……(4) θgF_1p-(-0.001801*νd_1p+0.648262)>0.04 ……(5) however, νd_1p: Abbe number of the positive lens in the first lens group with respect to the d line θgF_1p: partial dispersion ratio between the g line and the F line of the positive lens in the first lens group Let us assume that. [3] The 3c group includes at least one negative lens that satisfies the following condition (6): The optical system according to the above [1] or [2]. θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.008 ……(6) however, θgF_3cn: partial dispersion ratio between the g line and the F line of the negative lens in the 3c group νd_3cn: Abbe number of the negative lens in the 3c group for the d line Let us assume that. [4] The 3c group includes at least one negative lens that satisfies the following condition (7): The optical system according to any one of [1] to [3] above. νd_3cn<31 ……(7) however, νd_3cn: Abbe number of the negative lens in the 3c group for the d line Let us assume that. [5] The 3c group includes at least one negative lens that satisfies the following condition (8): The optical system according to any one of [1] to [4] above. 0<|f3cn / f|<0.15 ……(8) however, f3cn: focal length of the negative lens in the 3c group f: focal length of the entire system when focused at infinity Let us assume that. [6] The 3c group includes at least one negative lens that satisfies any one of the following conditional expressions (6), (7), and (8) and conditional expression (9): The optical system according to the above [1] or [2]. θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.008 ……(6) νd_3cn<31 ……(7) 0<|f3cn / f|<0.15 ……(8) D_3cnImg / f<0.15 ……(9) however, θgF_3cn: partial dispersion ratio between the g line and the F line of the negative lens in the 3c group νd_3cn: Abbe number of the negative lens in the 3c group for the d line f3cn: focal length of the negative lens in the 3c group f: focal length of the entire system when focused at infinity D_3cnImg: the distance between the vertex of the object-side surface of the negative lens in the 3c group and the image plane Let us assume that. [7] The first lens group has at least one negative lens that satisfies the following conditions (10) and (11): The optical system according to any one of [1] to [6] above. νd_1n<35 ……(10) θgF_1n-(-0.001801*νd_1n+0.648262)<0.010 ……(11) however, νd_1n: Abbe number of the negative lens in the first lens group with respect to the d line θgF_1n: partial dispersion ratio between the g line and the F line of the negative lens in the first lens group Let us assume that. [8] The following condition is satisfied: An optical system according to any one of [1] to [7] above. 0.05<|f3c / f|<0.3 ……(12) however, f3c: focal length of the 3c group f: focal length of the entire system when focused at infinity Let us assume that. [9] The second lens group is composed of a cemented lens or a single lens. The optical system according to any one of [1] to [8] above.

[10] The second lens group has a positive refractive power as a whole. The third lens group has a negative refractive power as a whole. The optical system according to any one of [1] to [9] above.

[11] The second lens group has a negative refractive power as a whole. The third lens group has a positive refractive power as a whole. The optical system according to any one of [1] to [9] above.

[12] The second lens group has a negative refractive power as a whole. The third lens group has a negative refractive power as a whole. The optical system according to any one of [1] to [9] above.

[13] an optical system; and an imaging element that outputs an imaging signal corresponding to an optical image formed by the optical system; The optical system includes: From the object side to the image plane side, a first lens group having positive refractive power as a whole, the first lens group being fixed relative to an image plane during focusing; a second lens group that has positive or negative refractive power as a whole and moves in the optical axis direction to perform focusing from infinity to a close distance; a third lens group which is divided into groups 3a, 3b, and 3c in that order from the object side to the image surface side, and which corrects image blur by moving group 3b in a direction approximately perpendicular to the optical axis, has negative or positive refractive power as a whole, and is fixed relative to the image surface during focusing; It is composed of The following condition is satisfied: Imaging device. L / f<1 ……(1) D_g1max / f>0.23 ……(2) D_3bImg / f<0.24 ……(3) however, L: the distance from the surface of the first lens group closest to the object to the image plane f: focal length of the entire system when focused at infinity D_g1max: the maximum air gap on the optical axis within the first lens group D_3bImg: the distance from the surface closest to the object side of the 3b group to the image plane Let us assume that.

[14] Further comprising a lens having substantially no refractive power. The optical system according to any one of [1] to

[12] above.

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

[13] above.

[0271] This application claims priority based on Japanese Patent Application No. 2019-104612, filed on June 4, 2019 in the Japan Patent Office, the entire contents of which are incorporated herein by reference.

[0272] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur to those skilled in the art depending on design requirements and other factors, and that such modifications are within the scope of the appended claims and their equivalents.

Claims

1. From the object side to the image plane side, a first lens group having positive refractive power as a whole, the first lens group being fixed relative to an image plane during focusing; a second lens group that has positive or negative refractive power as a whole and moves in the optical axis direction to perform focusing from infinity to a close distance; a third lens group which is divided into a group 3a, a group 3b, and a group 3c in that order from the object side toward the image surface side, and the group 3b is adapted to correct image blur by moving in a direction approximately perpendicular to the optical axis, and which has negative or positive refractive power as a whole and is fixed relative to the image surface during focusing; It is composed of The following conditional expressions (1) to (3) are satisfied: The 3c group includes at least one negative lens that satisfies the following condition (6): optical system. L / f<1...(1) D_g1max / f>0.23...(2) D_3bImg / f<0.24...(3) θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.008...(6) however, L: the distance from the surface of the first lens group closest to the object to the image plane f: focal length of the entire system when focused at infinity D_g1max: the maximum air gap on the optical axis within the first lens group D_3bImg: the distance from the surface of the 3b group closest to the object to the image plane θgF_3cn: partial dispersion ratio between the g line and the F line of the negative lens in the 3c group νd_3cn: Abbe number of the negative lens in the 3c group with respect to the d line Let us assume that.

2. The first lens group has at least one positive lens which satisfies the following conditional expressions (4) and (5): The optical system of claim 1 . νd_1p>90...(4) θgF_1p-(-0.001801*νd_1p+0.648262)>0.04...(5) however, νd_1p: Abbe number of the positive lens in the first lens group with respect to the d line θgF_1p: partial dispersion ratio between the g-line and the F-line of the positive lens in the first lens group Let us assume that.

3. The 3c group includes at least one negative lens that satisfies the following condition (7): The optical system of claim 1 . νd_3cn<31...(7) however, νd_3cn: Abbe number of the negative lens in the 3c group with respect to the d line Let us assume that.

4. The 3c group includes at least one negative lens that satisfies the following condition (8): The optical system of claim 1 . 0<|f3cn / f|<0.15...(8) however, f3cn: the focal length of the negative lens in the 3c group f: focal length of the entire system when focused at infinity Let us assume that.

5. The 3c group includes at least one negative lens that satisfies either one of the following conditional expressions (7) and (8) and conditional expression (9): The optical system of claim 1 . νd_3cn<31...(7) 0<|f3cn / f|<0.15...(8) D_3cnImg / f<0.15...(9) however, νd_3cn: Abbe number of the negative lens in the 3c group with respect to the d line f3cn: the focal length of the negative lens in the 3c group f: focal length of the entire system when focused at infinity D_3cnImg: the distance between the vertex of the object-side surface of the negative lens in the 3c group and the image plane Let us assume that.

6. The first lens group has at least one negative lens which satisfies the following conditional expressions (10) and (11): The optical system of claim 1 . νd_1n<35...(10) θgF_1n-(-0.001801*νd_1n+0.648262)<0.010...(11) however, νd_1n: Abbe number of the negative lens in the first lens group with respect to the d line θgF_1n: partial dispersion ratio between the g-line and the F-line of the negative lens in the first lens group Let us assume that.

7. The following condition is satisfied: The optical system of claim 1 . 0.05<|f3c / f|<0.3...(12) however, f3c: focal length of the 3c group f: focal length of the entire system when focused at infinity Let us assume that.

8. The second lens group is composed of a cemented lens or a single lens. The optical system of claim 1 .

9. the second lens group has a positive refractive power as a whole, The third lens group has a negative refractive power as a whole. The optical system of claim 1 .

10. the second lens group has a negative refractive power as a whole, The third lens group has a positive refractive power as a whole. The optical system of claim 1 .

11. the second lens group has a negative refractive power as a whole, The third lens group has a negative refractive power as a whole. The optical system of claim 1 .

12. an optical system; and an imaging element that outputs an imaging signal corresponding to an optical image formed by the optical system; The optical system includes: From the object side to the image plane side, a first lens group having positive refractive power as a whole, the first lens group being fixed relative to an image plane during focusing; a second lens group that has positive or negative refractive power as a whole and moves in the optical axis direction to perform focusing from infinity to a close distance; a third lens group which is divided into a group 3a, a group 3b, and a group 3c in that order from the object side toward the image surface side, and the group 3b is adapted to correct image blur by moving in a direction approximately perpendicular to the optical axis, and which has negative or positive refractive power as a whole and is fixed relative to the image surface during focusing; It is composed of The following conditional expressions (1) to (3) are satisfied: The 3c group includes at least one negative lens that satisfies the following condition (6): Imaging device. L / f<1...(1) D_g1max / f>0.23...(2) D_3bImg / f<0.24...(3) θgF_3cn-(-0.001801*νd_3cn+0.648262)>0.008...(6) however, L: the distance from the surface of the first lens group closest to the object to the image plane f: focal length of the entire system when focused at infinity D_g1max: the maximum air gap on the optical axis within the first lens group D_3bImg: the distance from the surface of the 3b group closest to the object to the image plane θgF_3cn: partial dispersion ratio between the g line and the F line of the negative lens in the 3c group νd_3cn: Abbe number of the negative lens in the 3c group with respect to the d line Let us assume that.

13. Further comprising a lens having substantially no refractive power.

12. The optical system according to claim 1.

14. The optical system further comprises a lens having substantially no refractive power. The imaging device according to claim 12.

Images