WO2020246427A1 - Optical system and imaging device - Google Patents

Abstract

This optical system is constituted from, in order from an object side to an image surface side: a first lens group which has an overall positive refractive power, and in which the entire group is fixed with respect to the image surface during focusing; a second lens group which has an overall positive or negative refractive power, and in which the entire group moves in the optical axis direction, thereby performing focusing from infinity to near-field; 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, the 3b group being configured so as to perform blur correction of an image by moving in a direction substantially perpendicular to the optical axis, the third lens group having an overall negative or positive refractive power, and the entire third lens group being fixed with respect to the image surface during focusing.

Description

Optical system and imaging device

The present disclosure relates to, for example, an optical system suitable for an interchangeable lens that can be attached to a digital still camera or a digital mirrorless camera, and an image pickup device provided with such an optical system.

In recent years, the number of pixels of image sensors used in interchangeable lens digital camera systems has been increasing, and optical systems are also required to have high depiction performance. In addition, compact and lightweight camera bodies are the mainstream in interchangeable-lens mirrorless cameras that have become widespread in recent years, and optical systems are also required to be smaller and lighter, and such optical systems have been developed (Patent Documents). 1).

JP-A-2017-215492

On the other hand, a telephoto lens compatible with a large image sensor such as a full-size sensor generally has a large size, and therefore, as an optical system, it is suitable for a small and lightweight camera body in terms of swingability. The position of the center of gravity is required to have a weight balance close to that of the camera body.

It is desirable to provide an optical system that is lightweight, has excellent swingability, and has high optical performance over the entire screen, and an image pickup device equipped with such an optical system.

The optical system according to the embodiment of the present disclosure has a positive refractive power as a group as a whole in order from the object side to the image plane side, and the entire group is fixed to the image plane during focusing. The first lens group, the second lens group that has a positive or negative refractive power as a whole group and focuses from infinity to a short distance by moving the entire group in the optical axis direction, and the image plane from the object side. It is divided into 3a group, 3b group, and 3c group in order toward the side, and the image blur correction is performed by moving the 3b group in a direction substantially perpendicular to the optical axis, and the group as a whole is negative or positive. The entire group is composed of a third lens group fixed to the image plane during focusing, and satisfies the following conditional expression.
L / f <1 …… (1)
D_g1max / f> 0.23 …… (2)
D_3bImg / f <0.24 …… (3)
However,
L: Distance from the most object-side surface of the first lens group to the image plane f: Focal length of the entire system at infinity D_g1max: Maximum air spacing on the optical axis in the first lens group D_3bImg: 3b The distance from the plane closest to the object to the image plane of the group.

The image pickup apparatus according to the embodiment of the present disclosure includes an optical system and an image pickup element that outputs an image pickup signal corresponding to an optical image formed by the optical system, and the optical system is the same as the embodiment of the present disclosure. It is configured by the optical system according to the form.

The optical system or the image pickup apparatus according to the embodiment of the present disclosure is composed of three lens groups as a whole, and the configuration of each lens group is optimized.

It is a lens sectional view which shows the 1st structural example (Example 1) of the optical system which concerns on one Embodiment of this disclosure. It is an aberration diagram which shows the longitudinal aberration at the time of focusing at infinity in the optical system which concerns on Example 1 which applied the specific numerical value to the optical system shown in FIG. FIG. 5 is an aberration diagram showing lateral aberration at infinity in focus and non-vibration isolation in the optical system according to the first embodiment in which specific numerical values are applied to the optical system shown in FIG. It is an aberration diagram which shows lateral aberration at the time of infinity focusing and vibration isolation in the optical system which concerns on Example 1 which applied the specific numerical value to the optical system shown in FIG. It is a lens sectional view which shows the 2nd structural example (Example 2) of the optical system which concerns on one Embodiment. FIG. 5 is an aberration diagram showing longitudinal aberration at infinity focusing in the optical system according to the second embodiment in which specific numerical values are applied to the optical system shown in FIG. FIG. 5 is an aberration diagram showing lateral aberration at infinity focusing and non-vibration isolation in the optical system according to the second embodiment in which specific numerical values are applied to the optical system shown in FIG. FIG. 5 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to the second embodiment in which specific numerical values are applied to the optical system shown in FIG. It is a lens sectional view which shows the 3rd structural example (Example 3) of the optical system which concerns on one Embodiment. It is an aberration diagram which shows the longitudinal aberration at the time of focusing at infinity in the optical system which concerns on Example 3 which applied the specific numerical value to the optical system shown in FIG. 9 is an aberration diagram showing lateral aberration at infinity in focus and non-vibration isolation in the optical system according to the third embodiment in which specific numerical values are applied to the optical system shown in FIG. 9 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to the third embodiment in which specific numerical values are applied to the optical system shown in FIG. It is a lens sectional view which shows the 4th structural example (Example 4) of the optical system which concerns on one Embodiment. It is an aberration diagram which shows the longitudinal aberration at the time of focusing at infinity in the optical system which concerns on Example 4 which applied a specific numerical value to the optical system shown in FIG. FIG. 3 is an aberration diagram showing lateral aberration at infinity focusing and non-vibration isolation in the optical system according to the fourth embodiment in which specific numerical values are applied to the optical system shown in FIG. FIG. 3 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to the fourth embodiment in which specific numerical values are applied to the optical system shown in FIG. It is a lens sectional view which shows the 5th structural example (Example 5) of the optical system which concerns on one Embodiment. It is an aberration diagram which shows the longitudinal aberration at the time of infinity focusing in the optical system which concerns on Example 5 which applied the specific numerical value to the optical system shown in FIG. FIG. 5 is an aberration diagram showing lateral aberration at infinity in focus and non-vibration isolation in the optical system according to the fifth embodiment in which specific numerical values are applied to the optical system shown in FIG. FIG. 5 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to Example 5 in which specific numerical values are applied to the optical system shown in FIG. It is a lens sectional view which shows the 6th structural example (Example 6) of the optical system which concerns on one Embodiment. It is an aberration diagram which shows the longitudinal aberration at the time of focusing at infinity in the optical system which concerns on Example 6 which applied the specific numerical value to the optical system shown in FIG. FIG. 5 is an aberration diagram showing lateral aberration at infinity in focus and non-vibration isolation in the optical system according to Example 6 in which specific numerical values are applied to the optical system shown in FIG. 21. It is an aberration diagram which shows lateral aberration at the time of infinity focusing and vibration isolation in the optical system which concerns on Example 6 which applied the specific numerical value to the optical system shown in FIG. It is a lens sectional view which shows the 7th structural example (Example 7) of the optical system which concerns on one Embodiment. FIG. 5 is an aberration diagram showing longitudinal aberration at infinity focusing in the optical system according to the seventh embodiment in which specific numerical values are applied to the optical system shown in FIG. 25. FIG. 5 is an aberration diagram showing lateral aberration at infinity focusing and non-vibration isolation in the optical system according to the seventh embodiment in which specific numerical values are applied to the optical system shown in FIG. 25. FIG. 5 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to the seventh embodiment in which specific numerical values are applied to the optical system shown in FIG. 25. It is a lens sectional view which shows the 8th structural example (Example 8) of the optical system which concerns on one Embodiment. It is an aberration diagram which shows the longitudinal aberration at the time of infinity focusing in the optical system which concerns on Example 8 which applied the specific numerical value to the optical system shown in FIG. 9 is an aberration diagram showing lateral aberration at infinity in focus and non-vibration isolation in the optical system according to Example 8 in which specific numerical values are applied to the optical system shown in FIG. 29. 9 is an aberration diagram showing lateral aberration at infinity in focus and at vibration isolation in the optical system according to Example 8 in which specific numerical values are applied to the optical system shown in FIG. 29. It is a lens sectional view which shows the 9th structural example (Example 9) of the optical system which concerns on one Embodiment. FIG. 3 is an aberration diagram showing longitudinal aberration at infinity focusing in the optical system according to the ninth embodiment in which specific numerical values are applied to the optical system shown in FIG. 33. FIG. 3 is an aberration diagram showing lateral aberration at infinity focusing and non-vibration isolation in the optical system according to the ninth embodiment in which specific numerical values are applied to the optical system shown in FIG. 33. FIG. 3 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to the ninth embodiment in which specific numerical values are applied to the optical system shown in FIG. 33. It is a lens sectional view which shows the tenth structural example (Example 10) of the optical system which concerns on one Embodiment. FIG. 3 is an aberration diagram showing longitudinal aberration at infinity focusing in the optical system according to the tenth embodiment in which specific numerical values are applied to the optical system shown in FIG. 37. FIG. 3 is an aberration diagram showing lateral aberration at infinity focusing and non-vibration isolation in the optical system according to the tenth embodiment in which specific numerical values are applied to the optical system shown in FIG. 37. FIG. 3 is an aberration diagram showing lateral aberration at infinity focusing and vibration isolation in the optical system according to the tenth embodiment in which specific numerical values are applied to the optical system shown in FIG. 37. It is a lens sectional view which shows the eleventh configuration example (Example 11) of the optical system which concerns on one Embodiment. It is an aberration diagram which shows the longitudinal aberration at the time of focusing at infinity in the optical system which concerns on Example 11 which applied the specific numerical value to the optical system shown in FIG. 41. FIG. 6 is an aberration diagram showing lateral aberration at infinity in focus and non-vibration isolation in the optical system according to the eleventh embodiment in which specific numerical values are applied to the optical system shown in FIG. 41. It is an aberration diagram which shows lateral aberration at the time of infinity focusing and vibration isolation in the optical system which concerns on Example 11 which applied the specific numerical value to the optical system shown in FIG. 41. It is a block diagram which shows one configuration example of an image pickup apparatus. It is a block diagram which shows an example of the schematic structure of a vehicle control system. It is explanatory drawing which shows an example of the installation position of the vehicle exterior information detection unit and the image pickup unit. It is a block diagram which shows an example of the schematic structure of the endoscopic surgery system. It is a block diagram which shows an example of the functional structure of the camera head and CCU shown in FIG. 48.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The explanation will be given in the following order.
0. Comparative example 1. Basic configuration of lens 2. Action / effect 3. Application example to imaging device 4. Numerical value example of lens 5. Application example 6. Other embodiments

<0. Comparative example>
Compact and lightweight camera bodies are the mainstream of interchangeable lens mirrorless cameras that have become widespread in recent years. On the other hand, a telephoto lens compatible with a large image sensor such as a full-size sensor generally has a large size, so that the center of gravity is close to the camera body, which is suitable for a small and lightweight body as an optical system. There is a strong demand for weight balance and weight reduction of the optical system itself.

In Patent Document 1 (Japanese Unexamined Patent Publication No. 2017-215492), in order from the object side to the image plane side, a first lens group having a positive refractive power, a second lens group having a positive or negative refractive power, and positive or negative An optical system has been proposed which is composed of a third lens group having a negative refractive power, the second lens group moves during focusing, and the distance between adjacent lens groups changes. In the optical system in Patent Document 1, the first lens group includes a positive lens G1p arranged on the most object side, a positive lens G2p arranged on the image plane side of the positive lens G1p, and an image plane of the positive lens G2p. It includes a positive lens G3p arranged on the side. In the optical system in Patent Document 1, the focal distance of the optical system is f, the distance on the optical axis from the lens surface on the most object side of the first lens group to the image surface is LD, and the image planes of the positive lens G1p and the positive lens G1p. When the distance on the optical axis with the lens arranged adjacent to the side 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 expression is satisfied. To do.
LD / f <1.0
0.20 ≤ D12 / LD <0.500
νdG2p> 73.0
νdG3p> 73.0

In the optical system in Patent Document 1, the weight of the lens barrel is reduced by providing a large air spacing in the first lens group. However, although the description of Patent Document 1 states that any lens block in the optical system can be set as an anti-vibration group, it actually has an appropriate anti-vibration sensitivity (of the anti-vibration group) suitable for functioning as an anti-vibration group. The lens block that satisfies the ratio of the amount of movement of the image to the amount of movement in the direction perpendicular to the optical axis) and the good optical performance when shifting the vibration isolation group is extremely limited, and the minimum vibration isolation function as an optical system. It is impossible to make an arbitrary lens block a vibration-proof group in order to establish. Further, in Patent Document 1, the positions of the lens blocks that can realistically play the role of the vibration isolation group in the embodiment are separated from the image plane, and the position of the center of gravity of the lens barrel is separated from the camera body. , The realization of comfortable swingability of the lens barrel is insufficient.

Therefore, it is a telephoto lens that has an anti-vibration function compatible with a large image sensor, is lightweight, has a center of gravity close to the image plane side, has excellent swingability, and has high optical performance with suppressed chromatic aberration and the like on the entire screen. It is desirable to provide an optimum optical system for a camera system or the like.
The optical system according to the following embodiment of the present disclosure is suitable for a telephoto lens used in such a mirrorless digital camera or the like.

<1. Basic lens configuration>
FIG. 1 shows a first configuration example of the optical system according to the embodiment of the present disclosure, and corresponds to the configuration of the first embodiment described later. FIG. 5 shows a second configuration example of the optical system according to the embodiment, and corresponds to the configuration of the second embodiment described later. FIG. 9 shows a third configuration example of the optical system according to the embodiment, and corresponds to the configuration of the third embodiment described later. FIG. 13 shows a fourth configuration example of the optical system according to the embodiment, and corresponds to the configuration of the fourth embodiment described later. FIG. 17 shows a fifth configuration example of the optical system according to the embodiment, and corresponds to the configuration of the fifth embodiment described later. FIG. 21 shows a sixth configuration example of the optical system according to the embodiment, and corresponds to the configuration of the sixth embodiment described later. FIG. 25 shows a seventh configuration example of the optical system according to the embodiment, and corresponds to the configuration of the seventh embodiment described later. FIG. 29 shows an eighth configuration example of the optical system according to the embodiment, and corresponds to the configuration of the eighth embodiment described later. FIG. 33 shows a ninth configuration example of the optical system according to the embodiment, and corresponds to the configuration of the ninth embodiment described later. FIG. 37 shows a tenth configuration example of the optical system according to the embodiment, and corresponds to the configuration of the tenth embodiment described later. FIG. 41 shows an eleventh configuration example of the optical system according to the embodiment, and corresponds to the configuration of the eleventh embodiment described later.

In FIG. 1 and the like, Z1 indicates the optical axis. An optical member such as a cover glass for protecting the image sensor may be arranged between the optical systems 1 to 11 according to the first to sixth configuration examples and the image plane Simg. Further, in addition to the cover glass, various optical filters such as a low-pass filter and an infrared cut filter may be arranged.

Hereinafter, the configuration of the optical system according to the embodiment of the present disclosure will be described in association with the optical systems 1 to 11 according to each configuration example shown in FIG. 1 and the like, and the techniques according to the present disclosure are illustrated. It is not limited to the configuration example.

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

The first lens group GR1 has a positive refractive power as the entire group, and the entire group is fixed to the image plane Simg during focusing.

The second lens group GR2 has a positive or negative refractive power as the entire group, and the entire group moves in the optical axis direction to perform focusing from infinity to a short distance. In each configuration example shown in FIG. 1 and the like, the lens arrangement at infinity focusing is shown. In the first configuration example (Example 1) to the sixth configuration example (Example 6), the second lens group GR2 has a positive refractive power as a whole group, and when focusing from infinity to a short distance, , The second lens group GR2 moves to the object side. In the seventh configuration example (Example 7) to the eleventh configuration example (Example 11), the second lens group GR2 has a negative refractive power as a group as a whole, and when focusing from infinity to a short distance, , The second lens group GR2 moves to the image plane side.

The third lens group GR3 has a negative or positive refractive power as the entire group, and the entire group is fixed to the image plane Simg during focusing. Further, the third lens group GR3 is divided into 3a group GR3a, 3b group GR3b, and 3c group GR3c in order from the object side to the image plane side. The group 3b GR3b is a vibration isolation group, and is adapted to correct 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 a negative refractive power as a whole group. In the eleventh configuration example (Example 11), the third lens group GR3 has a positive refractive power as a whole group.

It is desirable that the aperture stop St is arranged between the 3a group GR3a and the 3b group GR3b.

Further, the optical system according to the 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 most object-side surface of the first lens group GR1 to the image plane Simg f: Focal length of the entire system at infinity D_g1max: Maximum air spacing on the optical axis in the first lens group GR1 D_3bImg: The distance from the most object-side surface of the 3b group GR3b to the image plane Simg.

In addition, it is desirable that the optical system according to the embodiment satisfies a predetermined conditional expression or the like described later.

<2. Action / effect>
Next, the operation and effect of the optical system according to the embodiment of the present disclosure will be described. At the same time, a more desirable configuration in the optical system according to the embodiment of the present disclosure will be described.
It should be noted that the effects described in the present specification are merely examples and are not limited, and other effects may be obtained.

According to the optical system according to one embodiment, the lens group is composed of three lens groups as a whole, and the configuration of each lens group is optimized. Therefore, the weight is light and the center of gravity is close to the image plane side, and the swingability is excellent. , High optical performance with suppressed chromatic aberration and the like can be realized on the entire screen.

In the optical system according to one embodiment, a large air spacing is provided in the first lens group GR1 to realize weight reduction. Further, in the optical system according to one embodiment, by arranging the vibration isolation group (3b group GR3b) at the rear, the actuator that drives the lens can be arranged closer to the image plane, and the center of gravity becomes closer to the image plane. An optical system with excellent swingability can be realized.

Satisfying the above conditional expression (1) generally indicates that the optical system is a telephoto system. In an optical system satisfying the conditional formula (1) represented by a telephoto lens, the third lens group GR3 fixed to the image plane Simg is divided into three blocks of group 3a GR3a, group 3b GR3b, and group 3c GR3c. After the configuration is divided, the 3b group GR3b sandwiched in the center is used as the vibration isolation group, and the 3b group GR3b is arranged at a position satisfying the conditional expression (3) with respect to the image plane Simg. The 3a group GR3a and the 3c group GR3c before and after supplementing the aberration correction at the time of vibration isolation sandwich the 3b group GR3b which is the vibration isolation group, and the vibration isolation group satisfies the conditional expression (3) with respect to the image plane Simg. By arranging it in the rear position as described above, the height of light rays passing through the vibration isolation group from the axis to the peripheral image height, which is related to aberration deterioration during vibration isolation, becomes low, and good depiction performance can be obtained even during vibration isolation. it can. In addition, since the light passing height is lowered, the diameter of the vibration isolation group can be suppressed, and the actuator unit that drives the vibration isolation group can be easily made smaller and lighter. Further, since the actuator for driving the vibration isolation group is arranged at the rear part by arranging the vibration isolation group at the rear, it is possible to obtain an optical system in which the center of gravity is closer to the image plane and the swingability is very good.

Further, by satisfying the conditional equation (2) at the same time as the conditional equations (1) and (3), the weight of the optical element on the front side of the lens barrel, which accounts for most of the weight of the lens barrel in the telephoto lens, can be reduced. .. However, if the conditional equation (2) is simply satisfied and a large air spacing is provided in the first lens group GR1, the chromatic aberration generated in the optical system on the object side of the maximum air spacing propagates in the air spacing. It expands in proportion to the distance, making it difficult to achieve high depiction performance for the entire optical system. However, by simultaneously satisfying the above-mentioned conditional expression (3), the 3c group GR3c is arranged behind the optical system, that is, near the image plane Simg and at a position where the peripheral light beam height is high, so as to have a high aberration correction ability. Therefore, it is possible to cancel out the aberration generated in the first lens group GR1 which is approximately symmetrical in the optical system, and the depiction is high even when a large air spacing is provided in the first lens group GR1. Performance can be achieved.

In order to better realize the effects of the above conditional expressions (2) and (3), the numerical range of the conditional expressions (2) and (3) is set to the following conditional expression (2)', (3)'. It is more desirable to set as.
D_g1max / f> 0.24 …… (2)'
D_3bImg / f <0.23 …… (3)'

Even more desirablely, the numerical range of the conditional expressions (2) and (3) may be set as the following conditional expressions (2)'' and (3)''.
D_g1max / f> 0.25 …… (2)''
D_3bImg / f <0.22 …… (3)''

Further, in the optical system according to the embodiment, it is desirable that the first lens group GR1 has at least one positive lens satisfying 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 θgF_1p with respect to the d-line of the positive lens in the first lens group GR1. The partial dispersion ratio of the g-line and the F-line of the positive lens in the first lens group GR1.

By applying a low-dispersion glass material having strong anomalous dispersibility that simultaneously satisfies the conditional equations (4) and (5) to the positive lens in the first lens group GR1, it is possible to satisfactorily correct the chromatic aberration that is a problem in the telephoto lens. it can. If it falls below the lower limit of the conditional expression (4), the correction of the primary and secondary chromatic aberrations becomes insufficient, and the depiction performance of the entire screen deteriorates. If it falls below the lower limit of the conditional expression (5), the correction of the second-order chromatic aberration becomes insufficient, and the depiction performance of the entire screen deteriorates. The first-order chromatic aberration refers to the chromatic aberration between the F line and the C line, and the second-order chromatic aberration refers to the chromatic aberration including the short wavelength region (typically, the g line).

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

Even more preferably, the numerical range of the conditional expression (5) may be set as in the following conditional expression (5)''.
θgF_1p- (-0.001801 * νd_1p + 0.648262)> 0.06 …… (5)''

Further, in the optical system according to the embodiment, it is desirable that the 3c group GR3c includes at least one negative lens satisfying the following conditional expression (6).
θgF_3cn- (-0.001801 * νd_3cn + 0.648262)> 0.008 …… (6)
However,
θgF_3cn: Partial dispersion ratio of the g-line and F-line of the negative lens in the group GR3c νd_3cn: Abbe number with respect to the d-line of the negative lens in the group GR3c.

By applying the anomalous dispersion glass material satisfying the conditional expression (6) to the negative lens in the 3c group GR3c, the chromatic aberration of magnification is satisfactorily corrected, and good depiction performance can be obtained up to the peripheral portion. If it falls below the lower limit of the conditional expression (6), the correction of the second-order chromatic aberration of magnification is mainly insufficient, and the depiction performance of the peripheral portion of the screen deteriorates.

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

Even more preferably, the numerical range of the conditional expression (6) may be set as in the following conditional expression (6)''.
θgF_3cn- (-0.001801 * νd_3cn + 0.648262)> 0.016 …… (6)''

Further, in the optical system according to the embodiment, it is desirable that the 3c group GR3c includes at least one negative lens satisfying the following conditional expression (7).
νd_3cn <31 …… (7)
However,
νd_3cn: Abbe number for the d line of the negative lens in the 3c group GR3c.

By applying the anomalous dispersion glass material satisfying the conditional expression (7) to the negative lens in the 3c group GR3c, the chromatic aberration of magnification is satisfactorily corrected, and good depiction performance can be obtained up to the peripheral portion. If the upper limit of the conditional expression (7) is exceeded, the correction of the primary and secondary chromatic aberrations becomes insufficient, and the depiction performance of the entire screen deteriorates.

In order to better realize the effect of the conditional expression (7) described above, it is more desirable to set the numerical range of the conditional expression (7) as in the following conditional expression (7)'.
νd_3cn <28 …… (7)'

Even more preferably, the numerical range of the conditional expression (7) may be set as in the following conditional expression (7)''.
νd_3cn <25 …… (7)''

Further, in the optical system according to the embodiment, it is desirable that the 3c group GR3c includes at least one negative lens satisfying the following conditional expression (8).
0 << f3cn / f | <0.15 …… (8)
However,
f3cn: Focal length of the negative lens in the 3c group GR3c f: Focal length of the entire system at infinity focus.

By arranging a negative lens satisfying the focal length described in the conditional expression (8) in the 3c group GR3c, the chromatic aberration of magnification in the peripheral portion can be corrected more effectively, and good depiction performance can be obtained up to the peripheral portion. .. If the upper limit of the conditional expression (8) is exceeded, the action as a negative lens is lost, and the chromatic aberration correction effect cannot be provided. If it falls below the lower limit of the conditional expression (8), the power of the negative lens becomes too strong, and the corrected state of curvature of field, astigmatism, and distortion deteriorates.

In addition, in order to realize the effect of the conditional expression (8) better, it is more desirable to set the numerical range of the conditional expression (8) as the following conditional expression (8)'.
0 << f3cn / f | <0.13 …… (8)'

Even more preferably, the numerical range of the conditional expression (8) may be set as in the following conditional expression (8)''.
0 << f3cn / f | <0.10 …… (8)''

Further, in the optical system according to the embodiment, the 3c group GR3c is a negative lens that simultaneously satisfies any of the above conditional expressions (6), (7), and (8) and the following conditional expression (9). It is desirable to include at least one.
D_3cnImg / f <0.15 …… (9)
However,
f: Focal length of the entire system when focusing at infinity D_3cnImg: The distance between the surface apex of the negative lens on the object side in the 3c group GR3c and the image plane Simg.

By arranging a negative lens having a high chromatic aberration correction ability near the image plane so as to satisfy any of the above conditional expressions (6), (7), and (8) and the conditional expression (9) at the same time, chromatic aberration can be caused over the entire screen. It is suppressed and high depiction performance can be obtained. If the upper limit of the conditional expression (9) is exceeded, the negative lens moves away from the image plane Simg, and the chromatic aberration correction ability becomes insufficient.

In order to better realize the effect of the conditional expression (9) described above, it is more desirable to set the numerical range of the conditional expression (9) as in the following conditional expression (9)'.
D_3cnImg / f <0.14 …… (9)'

Even more preferably, the numerical range of the conditional expression (9) may be set as in the following conditional expression (9)''.
D_3cnImg / f <0.12 …… (9)''

Further, in the optical system according to the embodiment, it is desirable that the first lens group GR1 has at least one negative lens satisfying 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 θgF_1n with respect to the d line of the negative lens in the first lens group GR1 θgF_1n: The partial dispersion ratio of the g line and the F line of the negative lens in the first lens group GR1.

By applying a glass material having dispersion characteristics satisfying the conditional equations (10) and (11) to the negative lens in the first lens group GR1, the chromatic aberration which is a problem in the telephoto lens can be satisfactorily corrected. If the upper limit of the conditional expression (10) is exceeded, the correction of the primary and secondary chromatic aberrations becomes insufficient, and the depiction performance of the entire screen deteriorates. If the upper limit of the conditional expression (11) is exceeded, the correction of the second-order chromatic aberration becomes insufficient, and the depiction performance of the entire screen deteriorates.

In order to better realize the effects of the above conditional expressions (10) and (11), the numerical range of the conditional expressions (10) and (11) is set to the following conditional expressions (10)'and (11)'. It is more desirable to set as.
νd_1n <32 …… (10)'
θgF_1n- (-0.001801 * νd_1n + 0.648262) <0.009 …… (11)'

Even more preferably, the numerical range of the conditional expression (10) may be set as in the following conditional expression (10)''.
νd_1n <27 …… (10)''

Further, it is desirable that the optical system according to the embodiment satisfies the following conditional expression (12).
0.05 << | f3c / f | <0.3 …… (12)
However,
f3c: Focal length of 3c group GR3c f: Focal length of the entire system at infinity focus.

By setting the focal length of the 3c group GR3c within the range satisfying the conditional expression (12), it is possible to obtain good optical performance at the time of vibration isolation while setting the vibration isolation sensitivity to a value suitable for the vibration isolation group. If it falls below the lower limit of the conditional expression (12), the power of the 3c group GR3c becomes excessive, and the correction state of curvature of field, astigmatism, and distortion deteriorates. If the upper limit of the conditional expression (12) is exceeded, the power of the 3c group GR3c becomes too weak, and it becomes difficult to lower the vibration isolation group rearward while maintaining high optical performance at the time of vibration isolation.

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

Further, in the optical system according to the embodiment, it is desirable that the second lens group GR2 is composed of a junction lens or a single lens. As a result, a lightweight focusing group can be obtained, and high-speed, high-following AF (autofocus) performance can be realized.

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

FIG. 45 shows a configuration example of the image pickup apparatus 100 to which the optical system according to the embodiment is applied. The image pickup 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, and an R / W (reader / writer) 50. , CPU (Central Processing Unit) 60, an input unit 70, and a lens drive control unit 80.

The camera block 10 is responsible for an image pickup function, and has an optical system including an image pickup lens 110 and an image pickup element 12 such as a CCD (Charge Coupled Devices) or a CMOS (Complementary Metal Oxide Semiconductor). The image pickup device 12 converts the optical image formed by the image pickup lens 110 into an electric signal, thereby outputting an image pickup signal (image signal) corresponding to the optical image. As the image pickup lens 110, the optical systems 1 to 11 according to each configuration example shown in FIG. 1 and the like can be applied.

The camera signal processing unit 20 performs various signal processing such as analog-to-digital conversion, noise removal, image quality correction, and conversion to a luminance / color difference signal on the image signal output from the image sensor 12.

The image processing unit 30 performs recording / reproduction processing of an image signal, and performs compression coding / decompression decoding processing of an image signal based on a predetermined image data format, conversion processing of data specifications such as resolution, and the like. It has become.

The LCD 40 has a function of displaying various data such as an operation state of the user's input unit 70 and a captured image. The R / W 50 writes the image data encoded by the image processing unit 30 to the memory card 1000 and reads the image data recorded on the memory card 1000. The memory card 1000 is, for example, a semiconductor memory that can be attached to and detached from a slot connected to the R / W 50.

The CPU 60 functions as a control processing unit that controls each circuit block provided in the image pickup apparatus 100, and controls each circuit block based on an instruction input signal or the like from the input unit 70. The input unit 70 includes various switches and the like on which a required operation is performed by the user. The input unit 70 is composed of, for example, a shutter release button for performing a shutter operation, a selection switch for selecting an operation mode, and the like, and outputs an instruction input signal according to the operation by the user to the CPU 60. ing. The lens drive control unit 80 controls the drive of the lens arranged in the camera block 10, and controls a motor or the like (not shown) that drives each lens of the image pickup lens 110 based on a control signal from the CPU 60. It has become.

The operation of the image pickup apparatus 100 will be described below.
In the shooting standby state, under the control of the CPU 60, the image signal shot in the camera block 10 is output to the LCD 40 via the camera signal processing unit 20 and displayed as a camera-through image. Further, for example, 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 the image pickup lens 110 is controlled by the lens drive control unit 80. The predetermined lens moves.

When a shutter (not shown) of the camera block 10 is operated by the instruction input signal from the input unit 70, the captured image signal is output from the camera signal processing unit 20 to the image processing unit 30 and subjected to compression coding processing to obtain a predetermined image signal. Converted to digital data in data format. The converted data is output to the R / W 50 and written to the memory card 1000.

In focusing, for example, when the shutter release button of the input unit 70 is half-pressed or fully pressed for recording (shooting), the lens drive control unit 80 is based on a control signal from the CPU 60. This is done by moving a predetermined lens of the image pickup lens 110.

When reproducing the image data recorded on the memory card 1000, the R / W 50 reads out the predetermined image data from the memory card 1000 in response to the operation on the input unit 70, and the image processing unit 30 decompresses and decodes the predetermined image data. After the processing is performed, the reproduced image signal is output to the LCD 40 and the reproduced image is displayed.

In the above-described embodiment, an example in which the image pickup device is applied to a digital still camera or the like is shown, but the application range of the image pickup device is not limited to the digital still camera and is applied to various other image pickup devices. It is possible. For example, it can be applied to digital single-lens reflex cameras, digital non-reflex cameras, digital video cameras, surveillance cameras and the like. Further, it can be widely applied as a camera unit of a digital input / output device such as a mobile phone having a built-in camera or an information terminal having a built-in camera. It can also be applied to cameras with interchangeable lenses.

<4. Numerical Example of Lens>
Next, a specific numerical example of the optical system according to the embodiment of the present disclosure will be described. Here, an embodiment in which specific numerical values are applied to the optical systems 1 to 11 according to each configuration example shown in FIG. 1 and the like will be described.

The meanings of the symbols shown in the following tables and explanations are as shown below. "Si" indicates a surface number meaning the i-th surface counted 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 distance on the upper surface of the shaft between the i-th surface and the i + 1-th surface counting from the object side (unit: mm). “Ndi” indicates the refractive index of the glass material or material having the i-plane on the object side with respect to the d-line (wavelength 587.6 nm). “Νdi” indicates the Abbe number with respect to the d-line of the glass material or material having the i-th plane on the object side. “ΘgF” indicates the partial dispersion ratio of the g line (wavelength 435.8 nm) and the F line (wavelength 486.1 nm). “∞” with respect to the radius of curvature indicates that the surface is a plane. “STO” in the surface number column indicates that the aperture stop St is arranged at the corresponding position. “F” indicates the focal length of the entire lens system (unit: mm). "Fno" indicates an open F value (F number). “Ω” indicates a half angle of view (unit: °). "Y" indicates the image height (unit: mm). “L” indicates the total length of the lens (distance from the surface of the optical system closest to the object to the image plane) (unit: mm). "BF" indicates back focus (unit: mm).

[Configuration common to each embodiment]
The optical systems 1 to 11 to which the following Examples 1 to 11 are applied are all described in <1. The basic configuration of the lens> is satisfied.

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.

The first lens group GR1 has a positive refractive power as the entire group, and the entire group is fixed to the image plane Simg during focusing.

The second lens group GR2 has a positive or negative refractive power as the entire group, and the entire group moves in the optical axis direction to perform focusing from infinity to a short distance.

The third lens group GR3 has a negative or positive refractive power as the entire group, and the entire group is fixed to the image plane Simg during focusing. Further, the third lens group GR3 is divided into 3a group GR3a, 3b group GR3b, and 3c group GR3c in order from the object side to the image plane side. Group 3b GR3b is a vibration isolation group, and corrects image blur by moving in a direction substantially perpendicular to the optical axis Z1.

The aperture stop St is arranged between the 3a group GR3a and the 3b group GR3b.

[Example 1]
[Table 1] shows the basic lens data of Example 1 in which specific numerical values are applied to the optical system 1 shown in FIG. Further, in [Table 2], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown. The value of BF) is shown. [Table 3] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 1 according to the first embodiment, the first lens group GR1 is composed of seven lenses L11 to L17 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 1 according to the first embodiment, the second lens group GR2 is composed of a junction lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a positive refractive power as a whole group, and the second lens group GR2 moves toward the object when focusing from infinity to a short distance.

In the optical system 1 according to the first embodiment, the third lens group GR3 is composed of lenses L31 to L43 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 and L32. The group 3b 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 a negative refractive power as a whole group.

FIG. 2 shows the longitudinal aberration at infinity focusing in the optical system 1 according to the first embodiment. FIG. 2 shows spherical aberration, astigmatism (curvature of field), and distortion as longitudinal aberrations. In the spherical aberration diagram, the alternate long and short dash line shows the value at the C line (wavelength 545.3 nm), the solid line shows the value at the d line (wavelength 587.6 nm), and the broken line shows the value at the g line (wavelength 435.8 nm). In the astigmatism diagram, the solid line (S) shows the value on the sagittal image plane of the d line, and the alternate long and short dash line (T) shows the value on the tangier image plane of the d line. In the distortion diagram, the value on the d line is shown. Further, FIGS. 3 and 4 show the lateral aberration at the time of focusing at infinity in the optical system 1 according to the first embodiment. FIG. 3 shows the lateral aberration at the time of non-vibration isolation and FIG. 4 shows the lateral aberration at the time of vibration isolation. In the lateral aberration diagram, y indicates the image height, Δy indicates the lateral aberration in the tangier direction, and Δx indicates the lateral aberration in the sagittal direction. The same applies to the aberration diagrams in the other examples thereafter.

As can be seen from each aberration diagram, the optical system 1 according to the first embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 2]
[Table 4] shows the basic lens data of Example 2 in which specific numerical values are applied to the optical system 2 shown in FIG. Further, in [Table 5], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown. The value of BF) is shown. [Table 6] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 2 according to the second embodiment, the first lens group GR1 is composed of seven lenses L11 to L17 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 2 according to the second embodiment, the second lens group GR2 is composed of a junction lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a positive refractive power as a whole group, and the second lens group GR2 moves toward the object when focusing from infinity to a short distance.

In the optical system 2 according to the second embodiment, the third lens group GR3 is composed of lenses L31 to L43 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 and L32. The group 3b 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 a negative refractive power as a whole group.

FIG. 6 shows the longitudinal aberration at infinity focusing in the optical system 2 according to the second embodiment. 7 and 8 show the lateral aberration at infinity focusing in the optical system 2 according to the second embodiment.

As can be seen from each aberration diagram, the optical system 2 according to the second embodiment is lightweight, has an excellent center of gravity close to the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 3]
[Table 7] shows the basic lens data of Example 3 in which specific numerical values are applied to the optical system 3 shown in FIG. Further, in [Table 8], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown. The value of BF) is shown. [Table 9] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 3 according to the third embodiment, the first lens group GR1 is composed of seven lenses L11 to L17 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 3 according to the third embodiment, the second lens group GR2 is composed of a bonded lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a positive refractive power as a whole group, and the second lens group GR2 moves toward the object when focusing from infinity to a short distance.

In the optical system 3 according to the third embodiment, the third lens group GR3 is composed of lenses L31 to L44 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 and L32. The group 3b 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 a negative refractive power as a whole group.

FIG. 10 shows the longitudinal aberration at infinity focusing in the optical system 3 according to the third embodiment. 11 and 12 show lateral aberrations at infinity focusing in the optical system 3 according to the third embodiment.

As can be seen from each aberration diagram, the optical system 3 according to the third embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 4]
[Table 10] shows the basic lens data of Example 4 in which specific numerical values are applied to the optical system 4 shown in FIG. Further, in [Table 11], the focal length (f), the F value (Fno), the half angle of view (ω), the image height (Y), the total lens length (L), and the back focus at the time of focusing at infinity (f), and the back focus ( The value of BF) is shown. [Table 12] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 4 according to the fourth embodiment, the first lens group GR1 is composed of seven lenses L11 to L17 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 4 according to the fourth embodiment, the second lens group GR2 is composed of a junction lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a positive refractive power as a whole group, and the second lens group GR2 moves toward the object when focusing from infinity to a short distance.

In the optical system 4 according to the fourth embodiment, the third lens group GR3 is composed of lenses L31 to L44 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 and L32. The group 3b 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 a negative refractive power as a whole group.

FIG. 14 shows the longitudinal aberration at the time of focusing at infinity in the optical system 4 according to the fourth embodiment. 15 and 16 show lateral aberrations at infinity focusing in the optical system 4 according to the fourth embodiment.

As can be seen from each aberration diagram, the optical system 4 according to the fourth embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 5]
[Table 13] shows the basic lens data of Example 5 in which specific numerical values are applied to the optical system 5 shown in FIG. Further, in [Table 14], the focal length (f), the F value (Fno), the half angle of view (ω), the image height (Y), the total lens length (L), and the back focus at the time of focusing at infinity (f), and the back focus ( The value of BF) is shown. [Table 15] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 5 according to the fifth embodiment, the first lens group GR1 is composed of seven lenses L11 to L17 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 5 according to the fifth embodiment, the second lens group GR2 is composed of a junction lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a positive refractive power as a whole group, and the second lens group GR2 moves toward the object when focusing from infinity to a short distance.

In the optical system 5 according to the fifth embodiment, the third lens group GR3 is composed of lenses L31 to L43 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 and L32. The group 3b 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 a negative refractive power as a whole group.

FIG. 18 shows the longitudinal aberration at the time of focusing at infinity in the optical system 5 according to the fifth embodiment. 19 and 20 show lateral aberrations at infinity focusing in the optical system 5 according to the fifth embodiment.

As can be seen from each aberration diagram, the optical system 5 according to the fifth embodiment is lightweight, has a center of gravity close to the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 6]
[Table 16] shows the basic lens data of Example 6 in which specific numerical values are applied to the optical system 6 shown in FIG. Further, in [Table 17], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown. The value of BF) is shown. [Table 18] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 6 according to the sixth embodiment, the first lens group GR1 is composed of seven lenses L11 to L17 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 6 according to the sixth embodiment, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has a positive refractive power as a whole group, and the second lens group GR2 moves toward the object when focusing from infinity to a short distance.

In the optical system 6 according to the sixth embodiment, the third lens group GR3 is composed of lenses L31 to L45 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 and L32. The group 3b 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 a negative refractive power as a whole group.

FIG. 22 shows the longitudinal aberration at the time of focusing at infinity in the optical system 6 according to the sixth embodiment. 23 and 24 show lateral aberrations at infinity focusing in the optical system 6 according to the sixth embodiment.

As can be seen from each aberration diagram, the optical system 6 according to the sixth embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 7]
[Table 19] shows the basic lens data of Example 7 in which specific numerical values are applied to the optical system 7 shown in FIG. 25. Further, in [Table 20], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown. The value of BF) is shown. [Table 21] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 7 according to the seventh embodiment, the first lens group GR1 is composed of six lenses L11 to L16 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 7 according to the seventh embodiment, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has a negative refractive power as a whole group, and the second lens group GR2 moves toward the image plane when focusing from infinity to a short distance.

In the optical system 7 according to the seventh embodiment, the third lens group GR3 is composed of lenses L31 to L45 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 to L34. The group 3b 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 a negative refractive power as a whole group.

FIG. 26 shows the longitudinal aberration at the time of focusing at infinity in the optical system 7 according to the seventh embodiment. 27 and 28 show the lateral aberration at infinity focusing in the optical system 7 according to the seventh embodiment.

As can be seen from each aberration diagram, the optical system 7 according to the seventh embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 8]
[Table 22] shows the basic lens data of Example 8 in which specific numerical values are applied to the optical system 8 shown in FIG. 29. Further, in [Table 23], the focal length (f), the F value (Fno), the half angle of view (ω), the image height (Y), the total lens length (L), and the back focus at the time of focusing at infinity (f), and the back focus ( The value of BF) is shown. [Table 24] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 8 according to the eighth embodiment, the first lens group GR1 is composed of six lenses L11 to L16 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 8 according to the eighth embodiment, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has a negative refractive power as a whole group, and the second lens group GR2 moves toward the image plane when focusing from infinity to a short distance.

In the optical system 8 according to the eighth embodiment, the third lens group GR3 is composed of lenses L31 to L46 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 to L34. The group 3b 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 a negative refractive power as a whole group.

FIG. 30 shows the longitudinal aberration at the time of focusing at infinity in the optical system 8 according to the eighth embodiment. 31 and 32 show lateral aberrations at infinity focusing in the optical system 8 according to the eighth embodiment.

As can be seen from each aberration diagram, the optical system 8 according to the eighth embodiment is lightweight, has an excellent center of gravity near the imaging surface and has excellent swingability, and has obtained good optical performance in which chromatic aberration and the like are suppressed in the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 9]
[Table 25] shows the basic lens data of Example 9 in which specific numerical values are applied to the optical system 9 shown in FIG. 33. Further, in [Table 26], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown. The value of BF) is shown. [Table 27] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 9 according to the ninth embodiment, the first lens group GR1 is composed of six lenses L11 to L16 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 9 according to the ninth embodiment, the second lens group GR2 is composed of a single lens (lens L21). The second lens group GR2 has a negative refractive power as a whole group, and the second lens group GR2 moves toward the image plane when focusing from infinity to a short distance.

In the optical system 9 according to the ninth embodiment, the third lens group GR3 is composed of lenses L31 to L46 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 to L34. The group 3b 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 a negative refractive power as a whole group.

FIG. 34 shows the longitudinal aberration at the time of focusing at infinity in the optical system 9 according to the ninth embodiment. 35 and 36 show the lateral aberration at infinity focusing in the optical system 9 according to the ninth embodiment.

As can be seen from each aberration diagram, the optical system 9 according to the ninth embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 10]
[Table 28] shows the basic lens data of Example 10 in which specific numerical values are applied to the optical system 10 shown in FIG. 37. Further, in [Table 29], the focal length (f), F value (Fno), half angle of view (ω), image height (Y), total lens length (L), and back focus at in-focus are shown (Table 29). The value of BF) is shown. [Table 30] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

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

In the optical system 10 according to the tenth embodiment, the second lens group GR2 is composed of a junction lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a negative refractive power as a whole group, and the second lens group GR2 moves toward the image plane when focusing from infinity to a short distance.

In the optical system 10 according to the tenth embodiment, the third lens group GR3 is composed of lenses L31 to L46 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 to L34. The group 3b 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 a negative refractive power as a whole group.

FIG. 38 shows the longitudinal aberration at the time of focusing at infinity in the optical system 10 according to the tenth embodiment. 39 and 40 show lateral aberrations at infinity focusing in the optical system 10 according to the tenth embodiment.

As can be seen from each aberration diagram, the optical system 10 according to the tenth embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Example 11]
[Table 31] shows the basic lens data of Example 11 in which specific numerical values are applied to the optical system 11 shown in FIG. 41. Further, in [Table 32], the focal length (f), the F value (Fno), the half angle of view (ω), the image height (Y), the total lens length (L), and the back focus at the time of focusing at infinity (f), and the back focus ( The value of BF) is shown. [Table 33] shows the values of the surface spacing that are variable between infinity focusing and short distance focusing.

In the optical system 11 according to the eleventh embodiment, the first lens group GR1 is composed of six lenses L11 to L16 in order from the object side to the image plane side. The maximum air spacing on the optical axis in the first lens group GR1 is between the lens L11 and the lens L12.

In the optical system 11 according to the eleventh embodiment, the second lens group GR2 is composed of a junction lens composed of a lens L21 and a lens L22 in order from the object side to the image plane side. The second lens group GR2 has a negative refractive power as a whole group, and the second lens group GR2 moves toward the image plane when focusing from infinity to a short distance.

In the optical system 11 according to the eleventh embodiment, the third lens group GR3 is composed of lenses L31 to L46 in order from the object side to the image plane side. The group 3a GR3a is composed of lenses L31 to L34. The group 3b 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 a positive refractive power as a whole group.

FIG. 42 shows the longitudinal aberration at infinity focusing in the optical system 11 according to the eleventh embodiment. 43 and 44 show lateral aberrations at infinity focusing in the optical system 11 according to the eleventh embodiment.

As can be seen from each aberration diagram, the optical system 11 according to the eleventh embodiment is lightweight, has an excellent center of gravity near the imaging surface, and has excellent swingability, and good optical performance in which chromatic aberration and the like are suppressed is obtained over the entire screen. In addition, a good image is obtained while sufficiently exerting the anti-vibration effect in the telephoto region.

[Other numerical data of each embodiment]
[Table 34] to [Table 41] show the values related to each of the above conditional expressions summarized for each embodiment. In [Table 34] to [Table 41], lenses corresponding to each conditional expression are listed together with numerical values as appropriate. As can be seen from [Table 34] to [Table 41], the values of each embodiment are within the numerical range for each conditional expression.

<5. Application example>
[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 includes any type of movement such as automobiles, electric vehicles, hybrid electric vehicles, motorcycles, bicycles, personal mobility, airplanes, drones, ships, robots, construction machines, agricultural machines (tractors), and the like. It may be realized as a device mounted on the body.

FIG. 46 is a block diagram showing a schematic configuration example of a vehicle control system 7000, which is an example of a mobile control system to which the technique according to the present disclosure can be applied. The vehicle control system 7000 includes a plurality of electronic control units connected via the 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 external information detection unit 7400, an in-vehicle information detection unit 7500, and an integrated control unit 7600. .. The communication network 7010 connecting these plurality of control units conforms to any standard such as CAN (Controller Area Network), LIN (Local Interconnect Network), LAN (Local Area Network) or FlexRay (registered trademark). It may be an in-vehicle communication network.

Each control unit includes a microcomputer that performs arithmetic processing according to various programs, a storage unit that stores a program executed by the microcomputer or parameters used for various arithmetics, and a drive circuit that drives various control target devices. To be equipped. Each control unit is provided with a network I / F for communicating with other control units via the communication network 7010, and is connected to devices or sensors inside or outside the vehicle by wired communication or wireless communication. A communication I / F for performing communication is provided. In FIG. 46, as the functional configuration of the integrated control unit 7600, the microcomputer 7610, 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, the audio image output unit 7670, The vehicle-mounted network I / F 7680 and the storage unit 7690 are shown. Other control units also include a microcomputer, a communication I / F, a storage unit, and the like.

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

The vehicle condition detection unit 7110 is connected to the drive system control unit 7100. The vehicle state detection unit 7110 may include, for example, a gyro sensor that detects the angular velocity of the axial rotation of the vehicle body, an acceleration sensor that detects the acceleration of the vehicle, an accelerator pedal operation amount, a brake pedal operation amount, or steering wheel steering. Includes at least one of the sensors for detecting angular velocity, engine speed, wheel speed, and the like. The drive system control unit 7100 performs arithmetic processing using a signal input from the vehicle state detection unit 7110 to control an internal combustion engine, a drive motor, an electric power steering device, a brake device, and the like.

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 keyless entry system, a smart key system, a power window device, or a control device for various lamps such as headlamps, back lamps, brake lamps, blinkers or fog lamps. In this case, the body system control unit 7200 may be input with radio waves transmitted from a portable device that substitutes for the key or signals of various switches. The body system control unit 7200 receives inputs of these radio waves or signals and controls a vehicle door lock device, a power window device, a lamp, and the like.

The battery control unit 7300 controls the secondary battery 7310, which is the power supply source of the drive motor, according to various programs. For example, information such as the battery temperature, the battery output voltage, or the remaining capacity of the battery is input to the battery control unit 7300 from the battery device including the secondary battery 7310. The battery control unit 7300 performs arithmetic processing using these signals, and controls the temperature control of the secondary battery 7310 or the cooling device provided in the battery device.

The vehicle outside information detection unit 7400 detects information outside the vehicle equipped with the vehicle control system 7000. For example, at least one of the image pickup unit 7410 and the vehicle exterior information detection unit 7420 is connected to the vehicle exterior information detection unit 7400. The imaging unit 7410 includes at least one of a ToF (TimeOfFlight) camera, a stereo camera, a monocular camera, an infrared camera, and other cameras. The vehicle exterior information detection unit 7420 is used, for example, to detect the current weather or an environment sensor for detecting the weather, or to detect other vehicles, obstacles, pedestrians, etc. around the vehicle equipped with the vehicle control system 7000. At least one of the surrounding information detection sensors is included.

The environmental sensor may be, for example, at least one of a raindrop sensor that detects rainy weather, a fog sensor that detects fog, a sunshine sensor that detects the degree of sunshine, and a snow sensor that detects snowfall. The ambient 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 vehicle exterior information detection unit 7420 may be provided as independent sensors or devices, or may be provided as a device in which a plurality of sensors or devices are integrated.

Here, FIG. 47 shows an example of the installation positions of the image pickup unit 7410 and the vehicle exterior information detection unit 7420. The imaging units 7910, 7912, 7914, 7916, 7918 are provided, for example, at at least one of the front nose, side mirrors, rear bumpers, back door, and upper part of the windshield of the vehicle interior of the vehicle 7900. The image pickup unit 7910 provided on the front nose and the image pickup section 7918 provided on the upper part of the windshield in the vehicle interior mainly acquire an image in front of the vehicle 7900. The imaging units 7912 and 7914 provided in the side mirrors mainly acquire images of the side of the vehicle 7900. The imaging unit 7916 provided on the rear bumper or the back door mainly acquires an image of the rear of the vehicle 7900. The image pickup unit 7918 provided on the upper part of the windshield in the vehicle interior is mainly used for detecting a preceding vehicle, a pedestrian, an obstacle, a traffic light, a traffic sign, a lane, or the like.

Note that FIG. 47 shows an example of the photographing range of each of the imaging units 7910, 7912, 7914, 7916. The imaging range a indicates the imaging range of the imaging unit 7910 provided on the front nose, the imaging ranges b and c indicate the imaging ranges of the imaging units 7912 and 7914 provided on the side mirrors, respectively, and the imaging range d indicates the imaging range d. The imaging range of the imaging unit 7916 provided on the rear bumper or the back door is shown. For example, by superimposing the image data captured by the imaging units 7910, 7912, 7914, 7916, a bird's-eye view image of the vehicle 7900 as viewed from above can be obtained.

The vehicle exterior information detection units 7920, 7922, 7924, 7926, 7928, 7930 provided on the front, rear, side, corners of the vehicle 7900 and above the windshield in the vehicle interior may be, for example, an ultrasonic sensor or a radar device. The vehicle exterior information detection units 7920, 7926, 7930 provided on the front nose, rear bumper, back door, and upper part of the windshield in the vehicle interior of the vehicle 7900 may be, for example, a lidar device. These out-of-vehicle information detection units 7920 to 7930 are mainly used for detecting a preceding vehicle, a pedestrian, an obstacle, or the like.

Return to FIG. 46 and continue the explanation. The vehicle exterior information detection unit 7400 causes the image pickup unit 7410 to capture an image of the outside of the vehicle and receives the captured image data. Further, the vehicle exterior information detection unit 7400 receives the detection information from the connected vehicle exterior information detection unit 7420. When the vehicle exterior information detection unit 7420 is an ultrasonic sensor, a radar device, or a LIDAR device, the vehicle exterior information detection unit 7400 transmits ultrasonic waves, electromagnetic waves, or the like, and receives the received reflected wave information. The vehicle outside information detection unit 7400 may perform object detection processing or distance detection processing such as a person, a vehicle, an obstacle, a sign, or a character on a road surface based on the received information. The vehicle exterior information detection unit 7400 may perform an environment recognition process for recognizing rainfall, fog, road surface conditions, etc., based on the received information. The vehicle exterior information detection unit 7400 may calculate the distance to an object outside the vehicle based on the received information.

Further, the vehicle exterior information detection unit 7400 may perform image recognition processing or distance detection processing for recognizing a person, a vehicle, an obstacle, a sign, a character on the road surface, or the like based on the received image data. The vehicle exterior information detection unit 7400 performs processing such as distortion correction or alignment on the received image data, and synthesizes the image data captured by different imaging units 7410 to generate a bird's-eye view image or a panoramic image. May be good. The vehicle exterior information detection unit 7400 may perform the viewpoint conversion process using the image data captured by different imaging units 7410.

The in-vehicle information detection unit 7500 detects the in-vehicle information. For example, a driver state detection unit 7510 that detects the driver's state is connected to the in-vehicle information detection unit 7500. The driver state detection unit 7510 may include a camera that captures the driver, a biosensor that detects the driver's biological information, a microphone that collects sound in the vehicle interior, and the like. The biosensor is provided on, for example, the seat surface or the steering wheel, and detects the biometric information of the passenger sitting on the seat or the driver holding 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, and may determine whether the driver is dozing or not. You may. The in-vehicle information detection unit 7500 may perform processing such as noise canceling processing on the collected audio signal.

The integrated control unit 7600 controls the overall operation in the vehicle control system 7000 according to various programs. An input unit 7800 is connected to the integrated control unit 7600. The input unit 7800 is realized by a device such as a touch panel, a button, a microphone, a switch or a lever, which can be input-operated by a passenger. Data obtained by recognizing the voice input by the microphone may be input to the integrated control unit 7600. The input unit 7800 may be, for example, a remote control device using infrared rays 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. You may. The input unit 7800 may be, for example, a camera, in which case the passenger can input information by gesture. Alternatively, data obtained by detecting the movement of the wearable device worn by the passenger may be input. Further, the input unit 7800 may include, for example, an input control circuit that generates an input signal based on the information input by the passenger or the like using the input unit 7800 and outputs the input signal to the integrated control unit 7600. By operating the input unit 7800, the passenger or the like inputs various data to the vehicle control system 7000 and instructs the processing operation.

The storage unit 7690 may include a ROM (Read Only Memory) for storing various programs executed by the microcomputer, and a RAM (Random Access Memory) for storing various parameters, calculation results, sensor values, and the like. Further, 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, an optical magnetic storage device, or the like.

The general-purpose communication I / F 7620 is a general-purpose communication I / F that mediates communication with various devices existing in the external environment 7750. General-purpose communication I / F7620 is a cellular communication protocol such as GSM (registered trademark) (Global System of Mobile communications), WiMAX (registered trademark), LTE (registered trademark) (Long Term Evolution) or LTE-A (LTE-Advanced). , Or other wireless communication protocols such as wireless LAN (also referred to as Wi-Fi®), Bluetooth® may be implemented. The general-purpose communication I / F7620 connects to a device (for example, an application server or a control server) existing on an external network (for example, the Internet, a cloud network, or a business-specific network) via a base station or an access point, for example. You may. Further, the general-purpose communication I / F7620 uses, for example, P2P (Peer To Peer) technology to provide a terminal existing in the vicinity of the vehicle (for example, a terminal of a driver, a pedestrian or a store, or an MTC (Machine Type Communication) terminal). You may connect with.

The dedicated communication I / F 7630 is a communication I / F that supports a communication protocol formulated for use in a vehicle. The dedicated communication I / F7630 uses a standard protocol such as WAVE (Wireless Access in Vehicle Environment), DSRC (Dedicated Short Range Communications), or cellular communication protocol, which is a combination of IEEE802.11p in the lower layer and IEEE1609 in the upper layer. May be implemented. The dedicated communication I / F7630 typically includes vehicle-to-vehicle (Vehicle to Vehicle) communication, road-to-vehicle (Vehicle to Infrastructure) communication, vehicle-to-home (Vehicle to Home) communication, and pedestrian-to-vehicle (Vehicle to Pedestrian) communication. ) Perform V2X communication, which is a concept that includes one or more of communications.

The positioning unit 7640 receives, for example, a GNSS signal from a GNSS (Global Navigation Satellite System) satellite (for example, a GPS signal from a GPS (Global Positioning System) satellite), executes positioning, and executes positioning, and the latitude, longitude, and altitude of the vehicle. Generate location information including. The positioning unit 7640 may specify the current position by exchanging signals with the wireless access point, or may acquire position information from a terminal such as a mobile phone, PHS, or smartphone having a positioning function.

The beacon receiving unit 7650 receives radio waves or electromagnetic waves transmitted from a radio station or the like installed on the road, and acquires information such as the current position, traffic congestion, road closure, or required time. The function of the beacon receiving unit 7650 may be included in the above-mentioned dedicated communication I / F 7630.

The in-vehicle device I / F 7660 is a communication interface that mediates the connection between the microcomputer 7610 and various in-vehicle devices 7760 existing in the vehicle. The in-vehicle device I / F7660 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). In addition, the in-vehicle device I / F7660 is connected to USB (Universal Serial Bus), HDMI (registered trademark) (High-Definition Multimedia Interface), or MHL (Mobile) via a connection terminal (and a cable if necessary) (not shown). A wired connection such as High-definition Link) may be established. The in-vehicle device 7760 may include, for example, at least one of a passenger's mobile device or wearable device, or an information device carried or attached to the vehicle. Further, the in-vehicle device 7760 may include a navigation device that searches for a route to an arbitrary destination. The in-vehicle device I / F 7660 exchanges control signals or data signals with these in-vehicle devices 7760.

The in-vehicle network I / F7680 is an interface that mediates communication between the microcomputer 7610 and the communication network 7010. The vehicle-mounted network I / F7680 transmits / receives signals and the like according to a predetermined protocol supported by the communication network 7010.

The microcomputer 7610 of the integrated control unit 7600 is via at least one of general-purpose communication I / F7620, dedicated communication I / F7630, positioning unit 7640, beacon receiving unit 7650, in-vehicle device I / F7660, and in-vehicle network I / F7680. The vehicle control system 7000 is controlled according to various programs based on the information acquired. For example, the microcomputer 7610 calculates the control target value of the driving force generator, the steering mechanism, or the braking device based on the acquired information inside and outside the vehicle, and outputs a control command to the drive system control unit 7100. May be good. For example, the microcomputer 7610 realizes ADAS (Advanced Driver Assistance System) functions including vehicle collision avoidance or impact mitigation, follow-up driving based on inter-vehicle distance, vehicle speed maintenance driving, vehicle collision warning, vehicle lane deviation warning, and the like. Cooperative control may be performed for the purpose of. Further, the microcomputer 7610 automatically travels autonomously without relying on the driver's operation by controlling the driving force generator, the steering mechanism, the braking device, etc. based on the acquired information on the surroundings of the vehicle. Coordinated control for the purpose of driving or the like may be performed.

The microcomputer 7610 has information acquired via at least one of general-purpose communication I / F7620, dedicated communication I / F7630, positioning unit 7640, beacon receiving unit 7650, in-vehicle device I / F7660, and in-vehicle network I / F7680. Based on the above, three-dimensional distance information between the vehicle and an object such as a surrounding structure or a person may be generated, and local map information including the peripheral information of the current position of the vehicle may be created. Further, the microcomputer 7610 may predict a danger such as a vehicle collision, a pedestrian or the like approaching or entering a closed road based on the acquired information, and may generate a warning signal. The warning signal may be, for example, a signal for generating a warning sound or turning on a warning lamp.

The audio image output unit 7670 transmits an output signal of at least one of audio and image to an output device capable of visually or audibly notifying information to the passenger or the outside of the vehicle. In the example of FIG. 46, an audio speaker 7710, a display unit 7720, and an instrument panel 7730 are exemplified as output devices. The display unit 7720 may include, for example, at least one of an onboard display and a head-up display. The display unit 7720 may have an AR (Augmented Reality) display function. The output device may be other devices other than these devices, such as headphones, wearable devices such as eyeglass-type displays worn by passengers, and projectors or lamps. When the output device is a display device, the display device displays the results obtained by various processes performed by the microcomputer 7610 or the information received from other control units in various formats such as texts, images, tables, and graphs. Display visually. When the output device is an audio output device, the audio output device converts an audio signal composed of reproduced audio data or acoustic data into an analog signal and outputs the audio signal audibly.

In the example shown in FIG. 46, at least two control units connected via the communication network 7010 may be integrated as one control unit. Alternatively, each control unit may be composed of a plurality of control units. In addition, the vehicle control system 7000 may include another control unit (not shown). Further, in the above description, the other control unit may have a part or all of the functions carried out by any of the control units. That is, as long as information is transmitted and received via the communication network 7010, 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 a plurality of control units may send and receive detection information to and from each other via the communication network 7010. ..

In the vehicle control system 7000 described above, the optical system and the imaging device of the present disclosure can be applied to the imaging unit 7410 and the imaging unit 7910, 7912, 7914, 7916, 7918.

[5.2 Second application example]
The technique according to the present disclosure may be applied to an endoscopic surgery system.

FIG. 48 is a diagram showing an example of a schematic configuration of an endoscopic surgery system 5000 to which the technique according to the present disclosure can be applied. FIG. 48 shows a surgeon (doctor) 5067 performing surgery on patient 5071 on patient bed 5069 using the endoscopic surgery system 5000. As shown in the figure, the endoscopic surgery system 5000 includes an endoscope 5001, other surgical tools 5017, a support arm device 5027 for supporting the endoscope 5001, and various devices for endoscopic surgery. It is composed of a cart 5037 equipped with a.

In endoscopic surgery, instead of cutting the abdominal wall to open the abdomen, a plurality of tubular laparotomy devices called troccas 5025a to 5025d are punctured into the abdominal wall. Then, from the troccers 5025a to 5025d, the lens barrel 5003 of the endoscope 5001 and other surgical tools 5017 are inserted into the body cavity of the patient 5071. In the illustrated example, as other surgical tools 5017, a pneumoperitoneum tube 5019, an energy treatment tool 5021 and forceps 5023 are inserted into the body cavity of patient 5071. The energy treatment tool 5021 is a treatment tool that cuts and peels tissue, seals a blood vessel, or the like by using a high-frequency current or ultrasonic vibration. However, the surgical tool 5017 shown in the figure is merely an example, and as the surgical tool 5017, various surgical tools generally used in endoscopic surgery such as a sword and a retractor may be used.

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

(Support arm device)
The support arm device 5027 includes an arm portion 5031 extending from the base portion 5029. In the illustrated example, the arm portion 5031 is composed of joint portions 5033a, 5033b, 5033c, and links 5035a, 5035b, and is driven by control from the arm control device 5045. The endoscope 5001 is supported by the arm portion 5031, and its position and posture are controlled. As a result, the stable position of the endoscope 5001 can be fixed.

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

The tip of the lens barrel 5003 is provided with an opening in which the objective lens is fitted. A light source device 5043 is connected to the endoscope 5001, and the 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 an objective. It is irradiated toward the observation target in the body cavity of the patient 5071 through the lens. The endoscope 5001 may be a direct endoscope, a perspective mirror, or a side endoscope.

An optical system and an image sensor are provided inside the camera head 5005, and the reflected light (observation light) from the observation target is focused on the image sensor by the optical system. The observation light is photoelectrically converted by the image sensor, and an electric signal corresponding to the observation light, that is, an image signal corresponding to the observation image is generated. The image signal is transmitted as RAW data to the camera control unit (CCU: Camera Control Unit) 5039. The camera head 5005 is equipped with a function of adjusting the magnification and the focal length by appropriately driving the optical system thereof.

Note that, for example, in order to support stereoscopic viewing (3D display) and the like, the camera head 5005 may be provided with a plurality of image pickup elements. In this case, a plurality of relay optical systems are provided inside the lens barrel 5003 in order to guide the observation light to each of the plurality of image pickup elements.

(Various devices mounted on the cart)
The CCU 5039 is composed of a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and the like, and comprehensively controls the operations of the endoscope 5001 and the display device 5041. Specifically, the CCU 5039 performs various image processing for displaying an image based on the image signal, such as development processing (demosaic processing), on the image signal received from the camera head 5005. The CCU 5039 provides the image signal subjected to the image processing to the display device 5041. Further, the CCU 5039 transmits a control signal to the camera head 5005 and controls the driving thereof. The control signal may include information about imaging conditions such as magnification and focal length.

The display device 5041 displays an image based on the image signal processed by the CCU 5039 under the control of the CCU 5039. When the endoscope 5001 is compatible with high-resolution shooting such as 4K (3840 horizontal pixels x 2160 vertical pixels) or 8K (7680 horizontal pixels x 4320 vertical pixels), and / or 3D display. As the display device 5041, a device capable of displaying a high resolution and / or a device capable of displaying in 3D can be used corresponding to each of the above. When it is compatible with high-resolution shooting such as 4K or 8K, a more immersive feeling can be obtained by using a display device 5041 having a size of 55 inches or more. Further, a plurality of display devices 5041 having different resolutions and sizes may be provided depending on the application.

The light source device 5043 is composed of, for example, a light source such as an LED (light emission diode), and supplies the irradiation light for photographing the surgical site to the endoscope 5001.

The arm control device 5045 is configured by a processor such as a CPU, and operates according to a predetermined program to control the drive of the arm portion 5031 of the support arm device 5027 according to a predetermined control method.

The input device 5047 is an input interface for the endoscopic surgery system 5000. The user can input various information and input instructions to the endoscopic surgery system 5000 via the input device 5047. For example, the user inputs various information related to the surgery, such as physical information of the patient and information about the surgical procedure, via the input device 5047. Further, for example, the user gives an instruction to drive the arm portion 5031 via the input device 5047, or an instruction to change the imaging conditions (type of irradiation light, magnification, focal length, etc.) by the endoscope 5001. , An instruction to drive the energy treatment tool 5021 and the like are input.

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

Alternatively, the input device 5047 is a device worn by the user, such as a glasses-type wearable device or an HMD (Head Mounted Display), and various inputs are made according to the user's gesture and line of sight detected by these devices. Is done. Further, the input device 5047 includes a camera capable of detecting the movement of the user, and various inputs are performed according to the gesture and the line of sight of the user detected from the image captured by the camera. Further, the input device 5047 includes a microphone capable of picking up the user's voice, and various inputs are performed by voice through the microphone. In this way, the input device 5047 is configured to be able to input various information in a non-contact manner, so that a user belonging to a clean area (for example, an operator 5067) can operate a device belonging to a dirty area in a non-contact manner. Is possible. In addition, since the user can operate the device without taking his / her hand off the surgical tool he / she has, the convenience of the user is improved.

The treatment tool control device 5049 controls the drive of the energy treatment tool 5021 for cauterizing, incising, sealing blood vessels, and the like of tissues. The pneumoperitoneum device 5051 has a gas in the body cavity through the pneumoperitoneum tube 5019 in order to inflate the body cavity of the patient 5071 for the purpose of securing the field of view by the endoscope 5001 and securing the work space of the operator. Is sent. Recorder 5053 is a device capable of recording various information related to surgery. The printer 5055 is a device capable of printing various information related to surgery in various formats such as text, images, and graphs.

Hereinafter, a particularly characteristic configuration of the endoscopic surgery system 5000 will be described in more detail.

(Support arm device)
The support arm device 5027 includes a base portion 5029, which is a base, and an arm portion 5031 extending from the base portion 5029. In the illustrated example, the arm portion 5031 is composed of a plurality of joint portions 5033a, 5033b, 5033c and a plurality of links 5035a, 5035b connected by the joint portions 5033b, but in FIG. 48, for simplicity. , The configuration of the arm portion 5031 is shown in a simplified manner. Actually, the shapes, numbers and arrangements of the joint portions 5033a to 5033c and the links 5035a and 5035b, and the direction of the rotation axis of the joint portions 5033a to 5033c are appropriately set so that the arm portion 5031 has a desired degree of freedom. obtain. For example, the arm portion 5031 can be preferably configured to have at least 6 degrees of freedom. As a result, the endoscope 5001 can be freely moved within the movable range of the arm portion 5031, so that the lens barrel 5003 of the endoscope 5001 can be inserted into the body cavity of the patient 5071 from a desired direction. It will be possible.

Actuators are provided in the joint portions 5033a to 5033c, and the joint portions 5033a to 5033c are configured to be rotatable around a predetermined rotation axis by driving the actuator. By controlling the drive of the actuator by the arm control device 5045, the rotation angles of the joint portions 5033a to 5033c are controlled, and the drive of the arm portion 5031 is controlled. As a result, control of the position and orientation of the endoscope 5001 can be realized. 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.

For example, when the operator 5067 appropriately inputs an operation via the input device 5047 (including the foot switch 5057), the arm control device 5045 appropriately controls the drive of the arm unit 5031 in response to the operation input. The position and orientation of the endoscope 5001 may be controlled. By this control, the endoscope 5001 at the tip of the arm portion 5031 can be moved from an arbitrary position to an arbitrary position, and then fixedly supported at the moved position. The arm portion 5031 may be operated by a so-called master slave method. In this case, the arm portion 5031 can be remotely controlled by the user via an input device 5047 installed at a location away from the operating room.

When force control is applied, the arm control device 5045 receives an external force from the user, and the actuators of the joint portions 5033a to 5033c are moved so that the arm portion 5031 moves smoothly according to the external force. So-called power assist control for driving may be performed. As a result, when the user moves the arm portion 5031 while directly touching the arm portion 5031, the arm portion 5031 can be moved with a relatively light force. Therefore, the endoscope 5001 can be moved more intuitively and with a simpler operation, and the convenience of the user can be improved.

Here, in general, in endoscopic surgery, the endoscope 5001 was supported by a doctor called a scopist. On the other hand, by using the support arm device 5027, the position of the endoscope 5001 can be fixed more reliably without human intervention, so that an image of the surgical site can be stably obtained. , It becomes possible to perform surgery smoothly.

The arm control device 5045 does not necessarily have to be provided on the cart 5037. Further, the arm control device 5045 does not necessarily have to be one device. For example, the arm control device 5045 may be provided at each joint portion 5033a to 5033c of the arm portion 5031 of the support arm device 5027, and the arm portion 5031 is driven by the plurality of arm control devices 5045 cooperating with each other. Control may be realized.

(Light source device)
The light source device 5043 supplies the endoscope 5001 with the irradiation light for photographing the surgical site. The light source device 5043 is composed of, for example, an LED, a laser light source, or a white light source composed of a combination thereof. At this time, when a white light source is configured by combining RGB laser light sources, the output intensity and output timing of each color (each wavelength) can be controlled with high accuracy. Therefore, the white balance of the captured image in the light source device 5043 can be controlled. Can be adjusted. Further, in this case, the laser light from each of the RGB laser light sources is irradiated to the observation target in a time-divided manner, and the drive of the image sensor of the camera head 5005 is controlled in synchronization with the irradiation timing to support each of RGB. It is also possible to capture the image in a time-divided manner. According to this method, a color image can be obtained without providing a color filter on the image sensor.

Further, the drive of the light source device 5043 may be controlled so as to change the intensity of the output light at predetermined time intervals. By controlling the drive of the image sensor of the camera head 5005 in synchronization with the timing of changing the light intensity to acquire images in a time-divided manner and synthesizing the images, so-called high dynamic without blackout and overexposure Range images can be generated.

Further, the light source device 5043 may be configured to be able to supply light in a predetermined wavelength band corresponding to special light observation. In special light observation, for example, by utilizing the wavelength dependence of light absorption in body tissue to irradiate light in a narrow band as compared with the irradiation light (that is, white light) in normal observation, the mucosal surface layer. Narrow band imaging, in which a predetermined tissue such as a blood vessel is photographed with high contrast, is performed. Alternatively, in the special light observation, fluorescence observation in which an image is obtained by fluorescence generated by irradiating with excitation light may be performed. In fluorescence observation, the body tissue is irradiated with excitation light to observe the fluorescence from the body tissue (autofluorescence observation), or a reagent such as indocyanine green (ICG) is locally injected into the body tissue and the body tissue is injected. An excitation light corresponding to the fluorescence wavelength of the reagent may be irradiated to obtain a fluorescence image. The light source device 5043 may be configured to be capable of supplying narrow band light and / or excitation light corresponding to such special light observation.

(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 CCU5039 shown in FIG. 48.

Referring to FIG. 49, the camera head 5005 has a lens unit 5007, an imaging unit 5009, a driving unit 5011, a communication unit 5013, and a camera head control unit 5015 as its functions. Further, the CCU 5039 has a communication unit 5059, an image processing unit 5061, and a control unit 5063 as its functions. The camera head 5005 and the CCU 5039 are bidirectionally communicatively connected by a transmission cable 5065.

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. The observation light taken in from the tip of the lens barrel 5003 is guided to the camera head 5005 and incident on 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 collect the observation light on the light receiving surface of the image sensor of the image pickup unit 5009. Further, 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 the focus of the captured image.

The image pickup unit 5009 is composed of an image pickup element and is arranged after the lens unit 5007. The observation light that has passed through the lens unit 5007 is focused on the light receiving surface of the image pickup device, and an image signal corresponding to the observation image is generated by photoelectric conversion. The image signal generated by the image pickup unit 5009 is provided to the communication unit 5013.

As the image sensor that constitutes the image pickup unit 5009, for example, a CMOS (Complementary Metal Oxide Semiconductor) type image sensor that has a Bayer array and is capable of color photographing is used. As the image pickup device, for example, an image pickup device capable of capturing a high resolution image of 4K or higher may be used. By obtaining the image of the surgical site in high resolution, the surgeon 5067 can grasp the state of the surgical site in more detail, and the operation can proceed more smoothly.

Further, the image sensor constituting the image pickup unit 5009 is configured to have a pair of image pickup elements for acquiring image signals for the right eye and the left eye corresponding to 3D display, respectively. The 3D display enables the operator 5067 to more accurately grasp the depth of the biological tissue in the surgical site. When the image pickup unit 5009 is composed of a multi-plate type, a plurality of lens units 5007 are also provided corresponding to each image pickup element.

Further, the imaging unit 5009 does not necessarily have to be provided on the camera head 5005. For example, the imaging unit 5009 may be provided inside the lens barrel 5003 immediately after the objective lens.

The drive unit 5011 is composed of an actuator, and the zoom lens and focus lens of the lens unit 5007 are moved by a predetermined distance along the optical axis under the control of the camera head control unit 5015. As a result, the magnification and focus of the image captured by the imaging unit 5009 can be adjusted as appropriate.

The communication unit 5013 is composed of 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 image pickup 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 surgical site with low latency, it is preferable that the image signal is transmitted by optical communication. During surgery, the surgeon 5067 performs the surgery while observing the condition of the affected area using captured images, so for safer and more reliable surgery, the moving images of the surgical site are displayed in real time as much as possible. This is because it is required. When optical communication is performed, the communication unit 5013 is provided with a photoelectric conversion module that converts an electric 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.

Further, the communication unit 5013 receives a control signal for controlling the drive of the camera head 5005 from the CCU 5039. The control signal includes, for example, information to specify the frame rate of the captured image, information to specify the exposure value at the time of imaging, and / or information to specify the magnification and focus of the captured image. Contains information about the condition. The communication unit 5013 provides the received control signal to the camera head control unit 5015. The control signal from CCU5039 may also be transmitted by optical communication. In this case, the communication unit 5013 is provided with a photoelectric conversion module that converts an optical signal into an electric signal, and the control signal is converted into an electric signal by the photoelectric conversion module and then provided to the camera head control unit 5015.

The above imaging conditions such as frame rate, exposure value, magnification, focus, etc. are automatically set by the control unit 5063 of CCU5039 based on the acquired image signal. That is, the so-called AE (Auto Exposure) function, AF (Auto Focus) function, and AWB (Auto White Balance) function are mounted on the endoscope 5001.

The camera head control unit 5015 controls the drive of the camera head 5005 based on the control signal from the CCU 5039 received via the communication unit 5013. For example, the camera head control unit 5015 controls the drive of the image sensor of the image pickup unit 5009 based on the information to specify the frame rate of the captured image and / or the information to specify the exposure at the time of imaging. Further, for example, the camera head control unit 5015 appropriately moves the zoom lens and the focus lens of the lens unit 5007 via the drive unit 5011 based on the information that the magnification and the focus of the captured image are specified. The camera head control unit 5015 may further have a function of storing information for identifying the lens barrel 5003 and the camera head 5005.

By arranging the configuration of the lens unit 5007, the imaging unit 5009, and the like in a sealed structure having high airtightness and waterproofness, the camera head 5005 can be made resistant to autoclave sterilization.

Next, the functional configuration of CCU5039 will be described. The communication unit 5059 is composed of 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, corresponding to optical communication, the communication unit 5059 is provided with a photoelectric conversion module that converts an optical signal into an electric signal. The communication unit 5059 provides the image processing unit 5061 with an image signal converted into an electric signal.

Further, the communication unit 5059 transmits a control signal for controlling the drive of the camera head 5005 to the camera head 5005. The control signal may also be transmitted by optical communication.

The image processing unit 5061 performs various image processing on the image signal which is the RAW data transmitted from the camera head 5005. The image processing includes, for example, 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., various known signal processing is included. In addition, the image processing unit 5061 performs detection processing on the image signal for performing AE, AF, and AWB.

The image processing unit 5061 is composed of a processor such as a CPU or GPU, and when the processor operates according to a predetermined program, the above-mentioned image processing and detection processing can be performed. When the image processing unit 5061 is composed of a plurality of GPUs, the image processing unit 5061 appropriately divides the information related to the image signal and performs image processing in parallel by the plurality of GPUs.

The control unit 5063 performs various controls regarding 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 drive of the camera head 5005. At this time, when the imaging condition is input by the user, the control unit 5063 generates a control signal based on the input by the user. Alternatively, when the endoscope 5001 is equipped with the AE function, the AF function, and the AWB function, the control unit 5063 sets the optimum exposure value, focal length, and the optimum exposure value, depending on the result of the detection process by the image processing unit 5061. The white balance is calculated appropriately and a control signal is generated.

Further, the control unit 5063 causes the display device 5041 to display the image of the surgical unit 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 by using various image recognition techniques. For example, the control unit 5063 detects a surgical tool such as forceps, a specific biological part, bleeding, a mist when using the energy treatment tool 5021, etc. by detecting the shape and color of the edge of the object included in the surgical site image. Can be recognized. When displaying the image of the surgical site on the display device 5041, the control unit 5063 uses the recognition result to superimpose and display various surgical support information on the image of the surgical site. By superimposing the surgical support information and presenting it to the surgeon 5067, it becomes possible to proceed with the surgery more safely and surely.

The transmission cable 5065 that connects the camera head 5005 and the CCU 5039 is an electric signal cable that supports electric signal communication, an optical fiber that supports optical communication, or a composite cable thereof.

Here, 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 the two is performed wirelessly, it is not necessary to lay the transmission cable 5065 in the operating room, so that the situation where the movement of the medical staff in the operating room is hindered by the transmission cable 5065 can be solved.

The example of the endoscopic surgery system 5000 to which the technique according to the present disclosure can be applied has been described above. Although the endoscopic surgery system 5000 has been described here as an example, the system to which the technique according to the present disclosure can be applied is not limited to such an example. For example, the techniques according to the present disclosure may be applied to examination flexible endoscopic systems and microsurgery systems.

The technique according to the present disclosure can be suitably applied to the camera head 5005 among the configurations described above. In particular, the optical system of the present disclosure can be suitably applied to the lens unit 5007 of the camera head 5005.

<6. Other embodiments>
The technique according to the present disclosure is not limited to the above description of the embodiment and the embodiment, and various modifications can be performed.

For example, the shapes and numerical values of each part shown in each of the above examples are merely examples of the embodiment for carrying out the present technology, and the technical scope of the present technology is interpreted in a limited manner by these. There should be no such thing.

Further, in the above-described first embodiment and the embodiment, the configuration including substantially three lens groups has been described, but the configuration may further include a lens having substantially no refractive power.

Further, for example, the present technology can have the following configuration.
According to this technology with the following configuration, it is composed of three lens groups as a whole, and the configuration of each lens group is optimized. Therefore, it is lightweight, has excellent swingability, and has high optical performance over the entire screen. The system and the image pickup device can be realized.

[1]
From the object side to the image plane side, in order
A first lens group that has a positive refractive power as a whole group and the whole group is fixed to the image plane during focusing.
A second lens group that has a positive or negative refractive power as a whole group and focuses from infinity to a short distance by moving the entire group in the optical axis direction.
It is divided into 3a group, 3b group, and 3c group in order from the object side to the image plane side, and the image blur correction is performed by moving the 3b group in a direction substantially perpendicular to the optical axis. The group as a whole has a negative or positive refractive power, and is composed of a third lens group in which the entire group is fixed to the image plane during focusing.
An optical system that satisfies the following conditional expression.
L / f <1 …… (1)
D_g1max / f> 0.23 …… (2)
D_3bImg / f <0.24 …… (3)
However,
L: Distance from the most object-side surface of the first lens group to the image plane f: Focal length of the entire system at infinity D_g1max: Maximum air spacing on the optical axis in the first lens group D_3bImg : The distance from the surface on the most object side of the 3b group to the image plane.
[2]
The optical system according to the above [1], wherein the first lens group has at least one positive lens satisfying 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 θgF_1p with respect to the d-line of the positive lens in the first lens group: The partial dispersion ratio of the g-line and the F-line of the positive lens in the first lens group.
[3]
The optical system according to the above [1] or [2], wherein the 3c group includes at least one negative lens satisfying the following conditional expression (6).
θgF_3cn- (-0.001801 * νd_3cn + 0.648262)> 0.008 …… (6)
However,
θgF_3cn: Partial dispersion ratio of the g-line and F-line of the negative lens in the 3c group νd_3cn: Abbe number with respect to the d-line of the negative lens in the 3c group.
[4]
The optical system according to any one of the above [1] to [3], wherein the 3c group includes at least one negative lens satisfying the following conditional expression (7).
νd_3cn <31 …… (7)
However,
νd_3cn: Abbe number with respect to the d line of the negative lens in the 3c group.
[5]
The optical system according to any one of the above [1] to [4], wherein the 3c group includes at least one negative lens satisfying the following conditional expression (8).
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 at infinity focusing.
[6]
The above-mentioned [1] or [2], wherein the 3c group includes at least one negative lens satisfying any one of the following conditional expressions (6), (7), and (8) and the conditional expression (9). Optical system.
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 of the g-line and F-line of the negative lens in the 3c group νd_3cn: Abbe number with respect to the d-line of the negative lens in the 3c group f3cn: Focal length of the negative lens in the 3c group f: Focal length of the entire system at infinity focus D_3cnImg: The distance between the surface apex of the negative lens on the object side and the image plane in the 3c group.
[7]
The optical system according to any one of the above [1] to [6], wherein the first lens group has at least one negative lens satisfying 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 θgF_1n with respect to the d-line of the negative lens in the first lens group: The partial dispersion ratio of the g-line and the F-line of the negative lens in the first lens group.
[8]
The optical system according to any one of the above [1] to [7], which satisfies the following conditional expression.
0.05 << | f3c / f | <0.3 …… (12)
However,
f3c: Focal length of the 3c group f: Focal length of the entire system at infinity focus.
[9]
The optical system according to any one of the above [1] to [8], wherein the second lens group includes a bonded lens or a single lens.
[10]
The optics according to any one of [1] to [9] above, wherein the second lens group has a positive refractive power as a whole group, and the third lens group has a negative refractive power as a whole group. system.
[11]
The optics according to any one of [1] to [9] above, wherein the second lens group has a negative refractive power as a whole group, and the third lens group has a positive refractive power as a whole group. system.
[12]
The optics according to any one of [1] to [9] above, wherein the second lens group has a negative refractive power as a whole group, and the third lens group has a negative refractive power as a whole group. system.
[13]
It includes an optical system and an image pickup device that outputs an image pickup signal corresponding to an optical image formed by the optical system.
The optical system is
From the object side to the image plane side, in order
A first lens group that has a positive refractive power as a whole group and the whole group is fixed to the image plane during focusing.
A second lens group that has a positive or negative refractive power as a whole group and focuses from infinity to a short distance by moving the entire group in the optical axis direction.
It is divided into 3a group, 3b group, and 3c group in order from the object side to the image plane side, and the image blur correction is performed by moving the 3b group in a direction substantially perpendicular to the optical axis. The group as a whole has a negative or positive refractive power, and is composed of a third lens group in which the entire group is fixed to the image plane during focusing.
An imaging device that satisfies the following conditional expression.
L / f <1 …… (1)
D_g1max / f> 0.23 …… (2)
D_3bImg / f <0.24 …… (3)
However,
L: Distance from the most object-side surface of the first lens group to the image plane f: Focal length of the entire system at infinity D_g1max: Maximum air spacing on the optical axis in the first lens group D_3bImg : The distance from the surface on the most object side of the 3b group to the image plane.
[14]
The optical system according to any one of the above [1] to [12], further comprising a lens having substantially no refractive power.
[15]
The imaging device according to the above [13], wherein the optical system further includes a lens having substantially no refractive power.

This application claims priority on the basis of Japanese Patent Application No. 2019-104612 filed on June 4, 2019 at the Japan Patent Office, and the entire contents of this application are referred to in this application. Incorporate for application.

Those skilled in the art may conceive of various modifications, combinations, sub-combinations, and changes, depending on design requirements and other factors, which are included in the appended claims and their equivalents. It is understood that it is.

Claims (13)

1. From the object side to the image plane side, in order
   A first lens group that has a positive refractive power as a whole group and the whole group is fixed to the image plane during focusing.
   A second lens group that has a positive or negative refractive power as a whole group and focuses from infinity to a short distance by moving the entire group in the optical axis direction.
   It is divided into 3a group, 3b group, and 3c group in order from the object side to the image plane side, and the image blur correction is performed by moving the 3b group in a direction substantially perpendicular to the optical axis. The group as a whole has a negative or positive refractive power, and is composed of a third lens group in which the entire group is fixed to the image plane during focusing.
   An optical system that satisfies the following conditional expression.
   L / f <1 …… (1)
   D_g1max / f> 0.23 …… (2)
   D_3bImg / f <0.24 …… (3)
   However,
   L: Distance from the most object-side surface of the first lens group to the image plane f: Focal length of the entire system at infinity D_g1max: Maximum air spacing on the optical axis in the first lens group D_3bImg : The distance from the surface on the most object side of the 3b group to the image plane.
2. The optical system according to claim 1, wherein the first lens group has at least one positive lens satisfying 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 θgF_1p with respect to the d-line of the positive lens in the first lens group: The partial dispersion ratio of the g-line and the F-line of the positive lens in the first lens group.
3. The optical system according to claim 1, wherein the 3c group includes at least one negative lens satisfying the following conditional expression (6).
   θgF_3cn- (-0.001801 * νd_3cn + 0.648262)> 0.008 …… (6)
   However,
   θgF_3cn: Partial dispersion ratio of the g-line and F-line of the negative lens in the 3c group νd_3cn: Abbe number with respect to the d-line of the negative lens in the 3c group.
4. The optical system according to claim 1, wherein the 3c group includes at least one negative lens satisfying the following conditional expression (7).
   νd_3cn <31 …… (7)
   However,
   νd_3cn: Abbe number with respect to the d line of the negative lens in the 3c group.
5. The optical system according to claim 1, wherein the 3c group includes at least one negative lens satisfying the following conditional expression (8).
   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 at infinity focusing.
6. The optical system according to claim 1, wherein the group 3c includes at least one negative lens that satisfies any of the following conditional expressions (6), (7), and (8) and the conditional expression (9).
   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 of g-line and F-line of the negative lens in the 3c group νd_3cn: Abbe number with respect to d-line of the negative lens in the 3c group f3cn: Focal length of the negative lens in the 3c group f: Focal length of the entire system at infinity focus D_3cnImg: The distance between the surface apex of the negative lens on the object side and the image plane in the 3c group.
7. The optical system according to claim 1, wherein the first lens group has at least one negative lens satisfying 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 θgF_1n with respect to the d-line of the negative lens in the first lens group: The partial dispersion ratio of the g-line and the F-line of the negative lens in the first lens group.
8. The optical system according to claim 1, which satisfies the following conditional expression.
   0.05 << | f3c / f | <0.3 …… (12)
   However,
   f3c: Focal length of the 3c group f: Focal length of the entire system at infinity focus.
9. The optical system according to claim 1, wherein the second lens group includes a bonded lens or a single lens.
10. The optical system according to claim 1, wherein the second lens group has a positive refractive power as a whole group, and the third lens group has a negative refractive power as a whole group.
11. The optical system according to claim 1, wherein the second lens group has a negative refractive power as a whole group, and the third lens group has a positive refractive power as a whole group.
12. The optical system according to claim 1, wherein the second lens group has a negative refractive power as a whole group, and the third lens group has a negative refractive power as a whole group.
13. It includes an optical system and an image pickup device that outputs an image pickup signal corresponding to an optical image formed by the optical system.
    The optical system is
    From the object side to the image plane side, in order
    A first lens group that has a positive refractive power as a whole group and the whole group is fixed to the image plane during focusing.
    A second lens group that has a positive or negative refractive power as a whole group and focuses from infinity to a short distance by moving the entire group in the optical axis direction.
    It is divided into 3a group, 3b group, and 3c group in order from the object side to the image plane side, and the image blur correction is performed by moving the 3b group in a direction substantially perpendicular to the optical axis. The group as a whole has a negative or positive refractive power, and is composed of a third lens group in which the entire group is fixed to the image plane during focusing.
    An imaging device that satisfies the following conditional expression.
    L / f <1 …… (1)
    D_g1max / f> 0.23 …… (2)
    D_3bImg / f <0.24 …… (3)
    However,
    L: Distance from the most object-side surface of the first lens group to the image plane f: Focal length of the entire system at infinity D_g1max: Maximum air spacing on the optical axis in the first lens group D_3bImg : The distance from the surface on the most object side of the 3b group to the image plane.

Images