JP2019120814A - Optical instrument - Google Patents

Abstract

An optical apparatus for detecting a lens position with high accuracy with a simple configuration is provided.
A cylindrical base portion provided with restricting means, a cylindrical portion rotatable in a circumferential direction with respect to the base portion, and a plurality of supports provided on the outer periphery of the base portion for rotatably supporting the cylindrical portion A connecting portion which is provided on the cylindrical portion and rotates by engaging with the restricting means to rotate the cylindrical portion and abutting on the circumferential end of the restricting means to restrict the rotation of the cylindrical portion; , And one of the plurality of support portions is a bias support portion including a bias member that biases the cylindrical portion from the rotation center of the cylindrical portion to the outer peripheral direction, the bias support portion Is provided within the movable range of the connecting portion.
[Selected figure] Figure 8

Description

It relates to an optical instrument.

  Conventionally, in an optical apparatus such as an interchangeable lens, there is a lens drive system that moves a focusing lens and a magnification varying lens in the optical axis direction. The lens drive system is provided with an encoder for detecting the lens position. In such an optical instrument, it is desirable to detect the lens position with high accuracy.

  In the encoder described in Patent Document 1, the rotational axis of the guide roller is biased outward in the radial direction with respect to the drive base for one set of guide rollers among the three sets of guide rollers. Thus, the lens position detection accuracy is improved by reducing the play of the drive ring.

JP, 2014-35438, A

  When the coupling portion provided on the cylindrical portion abuts on the rotation restricting end of the drive base, the rotational moment causes a shift in relative position between the detection portion and the non-detection portion. In the encoder of Patent Document 1, since the sensor head is disposed in the same phase as the pair of guide rollers to be energized, the detection accuracy of the lens position may be reduced due to the shift due to the rotational moment.

  An object of the present invention is to provide an optical apparatus that detects a lens position with high accuracy with a simple configuration.

  In order to solve the above problems, the present invention provides a cylindrical base portion provided with restricting means, a cylindrical portion rotatable in a circumferential direction with respect to the base portion, and a cylindrical portion provided on the outer periphery of the base portion. A plurality of support portions rotatably supported, and the cylindrical portion provided on the cylindrical portion to rotate the cylindrical portion by moving in engagement with the restricting means, and a cylindrical portion by abutting on the circumferential end of the restricting means A biasing portion that regulates the rotation of the cylindrical portion, and one of the plurality of supporting portions includes a biasing member that biases the cylindrical portion from the rotation center of the cylindrical portion to the outer peripheral direction The biasing support may be provided within a movable range of the connection.

  According to the present invention, it is possible to provide an optical apparatus that detects a lens position with high accuracy with a simple configuration.

It is the schematic of the camera system containing the lens apparatus which concerns on this embodiment. It is a sectional view showing the composition of the whole lens device concerning this embodiment. It is a perspective view of a zoom drive unit. FIG. 6 is an exploded perspective view of the zoom drive unit as viewed from the object side. FIG. 6 is an exploded perspective view of the zoom drive unit as viewed from the imaging unit side. It is the schematic which shows the structural example of an optical encoder. It is a figure explaining the structural example of a film scale. It is a principal part perspective view of the drive ring unit and drive base unit in WIDE (wide angle) end position. It is a schematic diagram of the drive ring unit seen from the imaging part side and its periphery.

First Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is applicable to various optical devices (for example, a lens device, an imaging device, etc.) provided with a position detection unit of a rotating member. In the present embodiment, a camera system including a lens device and a camera body capable of holding the lens device will be described as an example.

  FIG. 1 is a schematic view of a camera system including a lens apparatus according to the present embodiment. The camera system 100 includes a camera body 110 and a lens device 120. The camera body 110 includes an imaging element 111. The imaging element 111 captures an image of a subject obtained by an imaging optical system 121 of the lens apparatus 120 described later. The imaging device 111 is, for example, a CCD image sensor or a CMOS image sensor.

  The lens device 120 is removably held by the camera body 110. The lens apparatus 120 includes a plurality of imaging optical systems 121. FIG. 2 is a cross-sectional view showing the configuration of the lens apparatus according to the present embodiment. In the present specification, the object side is defined as the front side, and the imaging unit side is defined as the rear side, and the positional relationship of each part will be described. Further, in the radial direction (radial direction with the optical axis O as the central axis), the side closer to the optical axis is defined as the inner peripheral side, and the side farther from the optical axis is defined as the outer peripheral side.

  The imaging optical system 121 of the present embodiment includes, from the front, a first lens L1, a second lens L2, a third lens L3a, an aperture unit 6, a vibration reduction (for image blur correction) lens L3b, a focusing lens L4, and a fifth lens L5. And. The first group moving member 1a holds the first group lens L1, and the second group moving member 2 holds the second group lens L2. The third group moving member 3a holds the third group lens L3a. The vibration reduction unit 3b holds the vibration reduction lens L3b, and corrects image blurring by moving the vibration reduction lens L3b in a direction perpendicular to the optical axis. The image stabilizing unit 3b is fixed to the third group moving member 3a. The first group lens L1, the second group lens L2, the third group lens L3a, and the image stabilizing unit 3b constitute a variable power optical system that performs a variable power operation by moving in the optical axis direction.

  The focus moving member 4 holds the focus lens L4. A guide mechanism by a guide bar (not shown) and a drive mechanism by a voice coil motor (not shown) are provided, and focusing is performed by moving the focus lens L4 in the optical axis direction. The fifth group fixing member 5 is a member that holds the fifth group lens L5. In order to change the aperture diameter of the optical system, the diaphragm unit 6 moves the diaphragm blade in a plane orthogonal to the optical axis by a drive unit (not shown) to adjust the light amount. The aperture unit 6 is fixed to the third group moving member 3a.

  The guide cylinder 7 is a member for linearly guiding the third group moving member 3a, and has a plurality of guide grooves. The guide cylinder 7 of the present embodiment is fixed to the fifth group fixing member 5 and has guide grooves parallel to the three optical axes in the circumferential direction. The cam cylinder 8 is a rotating member that fits on the outer periphery of the guide cylinder 7 and rotates at a fixed position. A plurality of cam grooves are provided in the circumferential direction of the cam cylinder 8, and drive and hold the first group moving member 1a holding the variable power lens group and the second group moving member 2 and 3 group moving member 3a in the optical axis direction. . In this embodiment, a total of seven cam groove portions are provided, three for the first lens group L1, one for the second lens group L2, and three for the third lens group L3a.

  The first group moving member 1a has a plurality of first group cam followers (not shown). The first group cam followers are substantially equally allocated on the inner periphery of the first group moving member 1a, and arranged at predetermined angular intervals (approximately 120 degrees) around the optical axis. The position of the first group moving member 1 a in the optical axis direction is determined by the engagement between the pair of first group cam followers and the first group cam groove of the cam cylinder 8. The other two pairs of the first cam follower and the first cam groove reinforce the lens apparatus when it receives an impact due to a disturbance or the like. The second group moving member 2 has a second group cam follower on the outer periphery. The position of the second group moving member 2 in the optical axis direction is determined by the engagement between the pair of second group cam followers and the second group cam groove portion of the cam barrel 8.

  The third group moving member 3a has a plurality of third group cam followers 3c. The third group cam followers 3c are substantially equally allocated on the outer periphery of the third group moving member 3a, and arranged at predetermined angular intervals (approximately 120 degrees) around the optical axis. The position of the third group moving member 3a in the optical axis direction is determined by the engagement of the plurality of third group cam followers 3c with the third group cam groove of the cam cylinder 8 and the guide groove of the guide cylinder 7.

  The third group moving member 3a has a sleeve hole portion and a U groove portion (not shown) on the outer side, and engages with a plurality of guide bars (not shown) fixedly held by the first group moving member 1a and the first group pressing member 1b. doing. Thereby, the third group moving member 3a determines the optical axis of the first group moving member 1a. The third group moving member 3a fixes and holds a plurality of guide bars (only the guide bar 103 is shown in FIG. 2) inside with the third group pressing member 3d. These guide bars are engaged with the sleeve hole 2 a and the U groove (not shown) provided in the second group moving member 2. Thereby, the third group moving member 3 a determines the optical axis of the second group moving member 2.

  A manual focus (hereinafter abbreviated as MF) appearance ring 9 and an MF operation ring 10 are operation members used for manual operation of focus adjustment. The MF operation ring 10 is integrally fixed to the MF appearance ring 9 and rotatably supported in a state of being held between the MF fixing member 11 and the MF cover member 12. When the photographer operates the MF appearance ring 9 to rotate the MF operation ring 10, a sensor (not shown) detects the rotation. A focusing operation is performed according to the amount of rotation of the MF operation ring 10.

  Next, the configuration of the zoom drive unit 28 according to the present embodiment will be described in detail with reference to FIGS. 3 to 5. FIG. 3 is a perspective view of the zoom drive unit 28. As shown in FIG. FIG. 4 is an exploded perspective view of the zoom drive unit 28 as viewed from the object side. FIG. 5 is an exploded perspective view of the zoom drive unit 28 as viewed from the imaging unit side.

  The manual zoom (hereinafter abbreviated as MZ) appearance ring 13 and the MZ operation ring 14 are operation members used for zooming operation. The MZ operation ring 14 is integrally fixed to the MZ appearance ring 13 and rotatably supported while being sandwiched between the MZ fixing member 15 and the MZ cover member 16.

  The drive ring 17 is rotatably supported at a fixed position relative to the drive base 20 in the optical axis direction by being sandwiched by the drive base 20 with the MZ cover member 16. That is, the drive ring 17 is a cylindrical member rotatable relative to the drive base 20, and the drive base 20 is a cylindrical base member relative to the drive ring 17.

  The drive ring 17 is supported to have an amount of rattling within an allowable range in the optical axis direction according to the thickness of the adjustment washer 27. Support of the drive ring 17 in the radial direction (radial direction) is performed using a plurality of guide rollers 21 as a support member. In the present embodiment, three guide rollers 21 are distributed at substantially equal angular intervals (approximately 120 degrees) on the outer periphery of the drive base 20. One of the three guide rollers 21 is a biasing support member having two compression coil springs 21c (shown in FIG. 8) for biasing the drive ring 17 from the rotation center of the drive ring 17 to the outer peripheral direction. In the radial direction of the drive ring 17 and the drive base 20, rattling is performed. The compression coil spring 21c is a biasing member.

  An MZ operation ring connection key (hereinafter referred to as a ring connection key) 18 is provided on the drive ring 17 and is fixed using two screws. The ring connection key 18 is provided on the drive ring 17 and engages with the engagement portion 14 a of the MZ operation ring 14. The cam cylinder connection key 19 is a connection portion provided on the drive ring 17 and fixed using two screws. The cam cylinder connection key 19 engages with the engagement portion 8 a of the cam cylinder 8. The cam cylinder connection key 19 engages with an opening 20a which is a rotation restricting means provided on the drive base 20, and abuts on the rotation restricting ends 20b and 20c to determine the rotation angle of the drive ring 17.

  When the photographer operates the MZ appearance ring 13 to rotate the MZ operation ring 14, the drive ring 17 rotates around the optical axis through the ring connection key 18. The drive ring 17 further rotates the cam barrel 8 around the optical axis via the cam barrel connection key 19. As described above, the cam barrel 8 that rotates in conjunction with the drive ring 17 is capable of moving the first group moving member 1a holding the variable power lens group, the second group moving member 2, and the third group moving member 3a in the optical axis In order to hold it, the imaging magnification can be changed.

  The film scale 22 and the sensor head 23 constitute an optical position detection encoder. The film scale 22 is a strip-like, flexible reflective scale portion (detected portion), and is attached along the inner peripheral wall of the drive ring 17. The sensor head 23, which is a detection unit, is positioned with high accuracy with respect to the film scale 22 and is integrally fixed to the drive base 20.

  The variable resistance sensor 24 is integrally fixed to the drive base 20, and has a sensor cam follower 24a which can be advanced and retracted in the optical axis direction. The sensor cam follower 24 a engages with a sensor cam groove 17 a provided in the drive ring 17. Thus, when the drive ring 17 rotates at a fixed position with respect to the drive base 20, the sensor cam follower 24a advances and retracts in the optical axis direction along with the rotation. The resistance value of the variable resistance sensor 24 changes in accordance with the position of the sensor cam follower 24 a in the optical axis direction. Therefore, a detection part (not shown) can grasp | ascertain by detecting the rotation angle of the drive ring 17 by an output voltage.

  In the present embodiment, in addition to the optical position detection encoder having the film scale 22 and the sensor head 23, the rotational position detection of the MZ operation ring 14 is performed using the variable resistance sensor 24.

  Next, the configuration and detection principle of the optical position detection encoder will be described with reference to FIGS. 6 and 7. As an example, although a so-called absolute type encoder capable of detecting an absolute position is described, it is not limited thereto. Here, the absolute position refers to the position of the drive ring 17 to which the film scale 22 is attached with respect to the sensor head 23. The position of the drive ring 17 is a position (angle) in the rotation direction with the optical axis O as a rotation center axis, and an output signal is generated according to the position in the rotation direction.

  FIG. 6 is a schematic view showing a configuration example of the optical encoder, FIG. 6 (A) is a perspective view, and FIG. 6 (B) is a cross-sectional view. In order to simplify the illustration, the film scale 22 will be described as being expanded in the circumferential direction. In the coordinate axes shown in FIG. 6, the X-axis direction indicates the direction in which the circumferential direction is developed, the Y-axis direction indicates the optical axis direction, and the Z-axis direction indicates the radial direction. FIG. 6 (B) shows the structure as viewed in the X-axis direction in the YZ plane.

  A part of the film scale 22 is disposed to face the sensor head 23. The film scale 22 is integrally fixed to the drive ring 17 and is movable in the pattern arrangement direction. The pattern arrangement direction is the X direction, that is, the circumferential direction. The sensor head 23 includes a light source 23 a and a plurality of light receiving units. The light source 23 a is a light emitting unit having an LED (light emitting diode) chip. The photo IC chips 23b and 23c constitute a light receiving unit. The photo IC chips 23b and 23c incorporate signal processing circuits, and include photodiode arrays 23d and 23e, respectively. The photodiode arrays 23d and 23e are light receiving elements mounted on the photo IC chips 23b and 23c, respectively. The sensor head 23 has a laminated structure including a printed circuit board 23f, a transparent resin 23g, and a protective glass 23h. The light source 23a and the photo IC chips 23b and 23c are mounted on the printed circuit board 23f and sealed with a transparent resin 23g and a protective glass 23h.

  Next, a configuration example of the film scale 22 will be described with reference to FIG. FIG. 7A is a view showing the entire configuration of the film scale 22, and FIG. 7B is an enlarged view of a slit pattern. The slit pattern is formed of a reflective film.

The film scale 22 is an elongated rectangular shape, and has tracks extending in the long side direction. The track of this embodiment includes a first track 22a and a second track 22b. The first track 22a is disposed on the upper side of FIG. 7A in the width direction (short side direction) of the scale portion. The second track 22 b is disposed on the lower side of FIG. 7A in the width direction of the scale portion. The reflection pattern of the first track 22a is constituted by the following pattern consisting of a plurality of rhombus-shaped portions.
Periodic pattern 22c of pitch P1.
Periodic pattern 22d of pitch P2.
Here, P1 <P2.

The reflection pattern of the second track 22b is constituted by the following pattern consisting of a plurality of rhombus-shaped portions.
Periodic pattern 22e of pitch P3.
Periodic pattern 22f of pitch P4.
Here, P3 <P4.

  The pitch P3 is slightly larger than the pitch P1, and the pitch P4 is slightly larger than the pitch P2, and the relationship of “P1 <P3 <P2 <P4” is established. Each of the pitches P1 and P3 and the pitches P2 and P4 constitutes the period of the vernier detection signal. The light emitted from the light source 23 a is applied to the patterns 22 c to 22 f of the film scale 22. The light emitted to the first track 22a on which the patterns 22c and 22d are formed and the second track 22b on which the patterns 22e and 22f are formed is reflected by the respective patterns. Reflected light by the patterns 22c and 22d enters the first light receiving unit (photodiode array 23d), and reflected light by the patterns 22e and 22f enters the second light receiving unit (photodiode array 23e). The light emission amount of the light source 23a is controlled by the control unit (not shown) based on the total output with respect to the incident light amount to the first light receiving unit and the second light receiving unit, and the output signal amplitude of the first light receiving unit and the second light receiving unit It is kept at a constant value. As a result, the light emission efficiency does not change due to the influence of the temperature environment of the light source 23a or the change with time. The output signals obtained from the photo IC chips 23b and 23c are a set of sine wave signals having a phase difference of 90 degrees corresponding to the pitch P1, the pitch P2, the pitch P3 and the pitch P4, respectively.

  The principle of detection of the absolute position will be described with reference to FIG. 7 (C). FIG. 7C is an explanatory diagram of signal synchronization, showing the relationship between signal amplitude and scale position. The upper signal, the middle signal, and the lower signal are shown from the top to the bottom in FIG. 7 (C). The lower signal shown in FIG. 7C is a signal of an incremental pattern. That is, the lower-order signal is cyclically repeated between −π and + π (radians) by subjecting the two sine wave signals 90 ° out of phase from the pitch P1 obtained from the photo IC chip 23b to an inverse tangent conversion. Signal. Similarly, a phase signal of pitch P3 is obtained from the photo IC chip 23c. A signal obtained by subtracting these phase signals is a middle order signal (vernier detection signal) shown in FIG. 7 (C). The upper signal shown in FIG. 7C is a sloped linear signal obtained from the output voltage value of the variable resistance sensor 24. The absolute position is identified by performing signal synchronization processing. That is, in the signal synchronization process, it is specified on the basis of the output value of the upper signal that the detection position is within the repetition signal of the middle order signal, and further the detection position is lower based on the output value of the middle order signal. It is specified what number in the repetitive signal of the signal.

  Therefore, when a relative shift between the film scale 22 and the sensor head 23 occurs, the light emitted from the light source 23a is reflected by the reflection patterns (22c to 22f) of the first track 22a and the second track 22b of the film scale 22. After that, light can not be correctly received by the first light receiving portion (23d) and the second light receiving portion (23e) of the sensor head 23. For example, when the facing distance between the film scale 22 and the sensor head 23 changes, light reception can not be performed correctly. As a result, when the influence on the middle order signal and the lower order signal becomes large, the signal synchronization may be lost. Therefore, the relative position between the film scale 22 and the sensor head 23 needs to be maintained with high accuracy.

  Next, the configurations of the drive ring unit and the drive base unit will be described in detail with reference to FIG. FIG. 8 is a perspective view of an essential part of the drive ring unit and the drive base unit at the WIDE (wide angle) end position. In the coordinate axes shown in FIG. 8, the X-axis direction and the Z-axis direction indicate the radial direction, and the Y-axis direction indicates the optical axis direction.

  In FIG. 8, the mechanism of the holding portion of the ring connection key 18, the cam cylinder connection key 19, and the film scale 22 integrated with the drive ring 17 is shown. Further, although the drive base 20 is not shown in FIG. 8, the fixed guide roller 21a, the biasing guide roller 21b, and the sensor head 23 integrated with the drive base 20 are shown.

  Hereinafter, the ring connection key 18, the cam cylinder connection key 19 and the holding portion of the film scale 22 integrated with the drive ring 17 will be referred to as a drive ring unit. The mechanism including the fixed guide roller 21a, the biasing guide roller 21b, and the sensor head 23 is referred to as a drive base unit.

  The position of the film scale 22 provided on the inner peripheral wall of the drive ring 17 is regulated in the circumferential direction and the radial direction by the fixing projection 17 b. The scale holding plate 25 is a holding member of the film scale 22 and is movable in the circumferential direction of the drive ring 17. The scale biasing spring 26 applies a biasing force in the circumferential direction of the drive ring 17 to the film scale 22 via the scale holding sheet metal 25. That is, the film scale 22 is held by the fixing projection 17 b provided at the drive ring 17 at one end, and the other end is urged in the circumferential direction by the scale urging spring 26. Attached to the inner circumferential wall of

  Since the film scale 22 is fixed while receiving the elastic force of the scale biasing spring 26, no excessive force is exerted even when the film scale 22 expands and contracts due to the influence of temperature change, moisture absorption and the like. Therefore, the positions of the reflection patterns (22 c to 22 f) of the first track 22 a and the second track 22 b of the film scale 22 can be maintained with high accuracy.

  Next, with reference to FIG. 9, the positional relationship between the drive ring 17, the ring connection key 18, the cam cylinder connection key 19, the fixed guide roller 21a, and the biasing guide roller 21b will be described in detail. FIG. 9A is a schematic view of the drive ring unit and the periphery thereof at the WIDE end position when viewed from the imaging unit side, and FIG. 9B is a TELE (telephoto) when viewed from the imaging unit side It is a schematic diagram of the drive ring unit in the end position, and its circumference.

  As shown in FIGS. 9A and 9B, the ring connection key 18 receives the operation force of the photographer from the MZ operation ring 14 and exerts an action force F1 or F2 at each zoom end (rotation restricting end 20b, 20c). Works. The drive ring 17 is rotated about the optical axis O together with the cam cylinder connection key 19 by the action force F1 or F2. At this time, the fixed guide roller 21 a and the urging guide roller 21 b rotatably support the drive ring 17. Further, the biasing force F3 is applied to the biasing guide roller 21b in the outer peripheral direction from the rotation center of the driving ring 17, thereby eliminating backlash of the driving base 20 and the driving ring 17.

  After the contact portion 19a of the cam cylinder connection key 19 comes into contact with the rotation restricting end 20b or 20c of the drive base 20, a rotational moment with the rotation restricting end 20b or 20c as a rotation center by the acting force F1 or F2 on the drive ring 17. M1 or M2 occurs. Specifically, when the cam cylinder connection key 19 abuts on the WIDE-side rotation restricting end 20b, the drive ring 17 rotates in an area B divided by a straight line connecting the rotation restricting end 20b and the optical axis O. M1 occurs and tries to displace in the direction of arrow D. However, since the guide roller 21 in the region B is the fixed guide roller 21 a having no biasing member, the displacement of the drive ring 17 in the direction of the arrow D hardly occurs.

  In addition, when it abuts on the TELE-side rotation restricting end 20c, the drive ring 17 generates a rotational moment M2 and is displaced in the direction of arrow E in a region C divided by a straight line connecting the rotation restricting end 20c and the optical axis. try to. However, since the guide roller 21 in the region C is the fixed guide roller 21 a having no biasing member, displacement of the drive ring 17 in the arrow E direction is unlikely to occur.

  The biasing guide roller 21 b is provided in an area A which is a movable range of the cam cylinder connection key 19 which does not include the areas B and C. Therefore, the biasing force F3 can always be applied without being affected by the rotational moments M1 and M2 which are intended to displace the drive ring 17 in the directions of the arrows D and E. Therefore, it is possible to suppress the deviation of the relative position between the film scale 22 attached to the drive ring 17 and the sensor head 23 attached to the drive base 20. Thereby, since it can hold | maintain precisely, high-precision position detection is attained.

  As shown in FIG. 9, when the sensor head 23 is provided at a position where the angle θ is 90 degrees, the sensor head 23 is located in the area B, so displacement may occur in the direction of the arrow D due to the rotational moment M1. . For this reason, it is desirable to set the rotation restricting end 20b to an end with lower imaging sensitivity among the ends on the WIDE side or the TELE side. This further improves the detection accuracy of the lens position.

(Other embodiments)
The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present invention.

Reference Signs List 17 drive ring 19 cam cylinder connection key 20 drive base 20b rotation restricting end 20c rotation restricting end 21b biasing guide roller 22 film scale 23 sensor head 24 variable resistance sensor

Claims (5)

A cylindrical base portion provided with restricting means;
A cylindrical portion rotatable in a circumferential direction with respect to the base portion;
A plurality of support portions provided on an outer periphery of the base portion and rotatably supporting the cylindrical portion;
A connection which is provided in the cylindrical portion, rotates the cylindrical portion by engaging and moving with the restricting means, and abuts on an end of the restricting means in the circumferential direction to restrict the rotation of the cylindrical portion With the department,
Among the plurality of support portions, one support portion is a biasing support portion including a biasing member that biases the cylindrical portion from the rotation center of the cylindrical portion toward the outer peripheral direction,
The biasing support portion is provided within a movable range of the connection portion.
Optical equipment characterized by   The optical apparatus according to claim 1, wherein the restricting means is an opening extending in a circumferential direction of the base portion.   The optical according to any one of claims 1 or 2, wherein an end lower in imaging sensitivity among end portions in the circumferential direction of the restriction means is located closer to the detection unit. machine. The optical device is a lens device provided with an imaging optical system.
The optical apparatus according to any one of claims 1 to 3, characterized in that: The optical device is a camera system including a lens apparatus including an imaging optical system, and an imaging apparatus capable of holding the lens apparatus and including an imaging element.
The optical apparatus according to any one of claims 1 to 3, characterized in that: