Optical apparatus and image forming apparatus

Abstract

An interchangeable lens includes: a guide barrel; a rear base that moves in the optical axis direction; a cam ring rotatably held with respect to the guide cylinder; and a zoom position detection scale and a zoom position detection sensor provided to directly detect a relative position between the rear base and the guide cylinder. The rear base holds a fourth main bearing that engages with one of a rear linear groove and a cam groove provided in the guide cylinder and one of a rear cam groove and a linear groove provided in the cam ring. The rear base moves in the optical axis direction by rotation of the cam ring.

Description

Technical Field

[0001] The present disclosure relates to an optical device and an imaging device. Background Art

[0002] In the camera system, in order to suppress the focus shift that occurs when the focal length is changed by a mechanical mechanism, control is performed so that the focus lens moves according to the change in the zoom position so as to correct the focus shift and maintain the focused state. The movement trajectory of the focus lens is predetermined as an electronic cam trajectory (tracking data) that indicates the position of the focus lens relative to the position of the moving lens unit for each object distance. In such a zoom optical system, in order to zoom while maintaining the focused state, the position of the moving lens unit and the position of the focus lens must always be accurately maintained so as to have a relationship determined by the tracking data.

[0003] Japanese Patent Application Laid-Open No. 2014-186225 discloses a configuration in which a rotational position of a cam barrel that rotates integrally with a zoom ring is detected by a linear position sensor so as to detect the rotational position of the zoom ring. Also, Japanese Patent Application Laid-Open No. 2017-122755 discloses a configuration in which an engagement member of a linear sensor is engaged with an engagement groove formed in an auxiliary ring, and a zoom position of a second lens unit mounted on the auxiliary ring in a radial direction is detected by the linear sensor. Summary of the invention

[0004] An object of the present disclosure is to provide an optical device capable of suppressing focus movement caused by zoom variation during a zoom reversal operation.

[0005] According to an embodiment of the present invention, an optical device includes: a fixed member; a base moving member that moves along the optical axis direction; a rotating member that is rotatably held relative to the fixed member; and a detection unit that is configured to directly detect the relative position between the base moving member and the fixed member, wherein the base moving member holds an engaging member that engages with one of a linear groove and a cam groove provided in the fixed member and one of a cam groove and a linear groove provided in the rotating member, wherein the base moving member moves along the optical axis direction by rotation of the rotating member.

[0006] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a cross-sectional view of the interchangeable lens (1) at the wide-angle end (wide end) and the telephoto end (telephoto end).

[0008] Figure 2It is an exploded perspective view of the housing and the guide barrel unit.

[0009] Figure 3 It is an exploded perspective view of the guide cylinder unit.

[0010] Figure 4 It is an exploded perspective view of each lens unit constituting the zoom mechanism.

[0011] Figure 5 is an exploded perspective view of the rear lens unit (800).

[0012] Figure 6 is an exploded perspective view of the flexible substrate holder unit (410).

[0013] Figure 7 is a perspective view of a flexible substrate holder unit (410).

[0014] Figure 8 is a top view of the rear lens unit (800).

[0015] Fig. 9 is a side view of the rear lens unit (800).

[0016] Fig.10 It is a diagram showing the output characteristics of the zoom position detection sensor (16).

[0017] Fig.11 is a schematic diagram showing a configuration example of an imaging apparatus. DETAILED DESCRIPTION

[0018] Preferred embodiments of the present invention will be described in detail below based on the accompanying drawings. First, the overall configuration of an interchangeable lens 1 (optical device) according to an embodiment of the present disclosure, which is a lens barrel for a lens-interchangeable camera, will be described with reference to the accompanying drawings.

[0019] Figure 1 It is a sectional view of the interchangeable lens 1 according to the embodiment taken along a section parallel to the optical axis, the figure on the upper side of the paper surface represents the state at the wide-angle end (wide end), and the figure on the lower side of the paper surface represents the state at the telephoto end (telephoto end).

[0020] The interchangeable lens 1 of the embodiment is a zoom lens capable of changing the focal length from the wide angle end (wide end) to the telephoto end (telephoto end). A mount 2 is attached to the interchangeable lens 1, which holds the interchangeable lens 1 so as to be electrically connectable to the camera side, and the interchangeable lens 1 can be attached to and detached from the camera.

[0021] The interchangeable lens 1 has a seven-unit configuration including lens units of the first unit to the seventh unit. These lens units are arranged in the order of the first lens unit 100, the second lens unit 200, the third lens unit 300, the fourth lens unit 400, the fifth lens unit 500, the sixth lens unit 600, and the seventh lens unit 700 from the object side. Among these lens units, the focal length can be changed from the wide-angle end (wide end) to the telephoto end (telephoto end) by moving the second lens unit to the seventh lens unit through a zoom operation.

[0022] (About zoom mechanism)

[0023] The zoom mechanism of the interchangeable lens 1 of the embodiment is a zoom mechanism using a so-called cam groove or a linear groove and an engaging member (such as a roller or a bearing) for holding each lens unit. Figure 1 , 2 and 3 introduce the details of the zoom mechanism. Figure 2 It is an exploded perspective view of the housing and the guide barrel unit. Figure 3 It is an exploded perspective view of the guide cylinder unit.

[0024] The first fixed cylinder 3 is a member that fixes and holds the mount 2 , the guide cylinder 9 (fixing member), and the second fixed cylinder 4 .

[0025] The guide barrel 9 is provided with a cam ring bayonet protrusion 9b for limiting the movement of the cam ring 10 (rotating member) in the optical axis direction, and the cam ring bayonet protrusion 9b is engaged with a bayonet groove 10a provided in the cam ring 10. Moreover, the guide barrel 9 is provided with a cam ring radial fitting portion 9c for holding the cam ring 10 rotatably around the axis, and the cam ring radial fitting portion 9c is engaged with a guide barrel radial fitting portion 10b provided on the cam ring 10. With this configuration, the cam ring 10 is rotatably held relative to the guide barrel 9. The guide barrel unit includes the guide barrel 9 and the cam ring 10.

[0026] Furthermore, the guide cylinder 9 is provided with a zoom holding portion 9f for zoom position detection, and a zoom holder unit 13 for zoom position detection is adhesively fixed to the zoom holding portion 9f. The zoom holder unit 13 includes a zoom holder 15 for zoom position detection, and a zoom position detection scale 14 (detection unit) is adhesively fixed to the zoom holder 15. A reflection pattern is provided on the surface of the zoom position detection scale 14, and when combined with a zoom position detection sensor 16 (detection unit, detection portion) equipped with a light emitting portion and a light receiving portion, an absolute position can be detected by detecting the reflection pattern. It should be noted that the zoom position detection sensor 16 can detect the zoom position detection scale 14 electrically, magnetically or optically. The zoom position detection scale 14 is held by the guide cylinder 9, and the zoom position detection sensor 16 is held by a rear base 403 (base moving member) to be described later, so that the zoom position detection sensor 16 directly detects the relative position between the rear base 403 and the cam ring 10. Alternatively, the zoom position detection scale 14 may be held by the rear base 403, and the zoom position detection sensor 16 may be held by the guide cylinder 9. A method of holding the zoom position detection sensor 16 will be described later.

[0027] (Zoom ring arrangement)

[0028] The zoom ring 6 is rotatably held relative to the second fixed lens barrel 4. Moreover, the zoom key 7 is held by the zoom ring 6. The zoom key 7 passes through a zoom key slit portion 5a provided on the third fixed barrel 5 held by the second fixed barrel 4, and a cam ring engaging portion 7a provided on the zoom key 7 engages with a zoom key engaging portion (not shown) provided on the cam ring 10. With this configuration, when the zoom ring 6 rotates, the cam ring 10 rotates around the guide barrel 9 in conjunction with the rotation of the zoom ring 6.

[0029] The third fixed cylinder 5 holds a rotation detection sensor 8 which serves as a detector for detecting the rotation amount of the zoom ring 6. The rotation detection sensor 8 electrically detects the movement amount of the movable element 8b holding the metal brush when the movable element 8b moves relative to the resistor provided on the surface of the arc-shaped sensor base 8a.

[0030] The movable element 8b is held by a movable element holding portion 6a provided on the radially inner side of the zoom ring 6, and detects the rotation amount of the zoom ring 6. The detected rotation amount of the zoom ring 6 is transmitted to the main substrate 11 through a flexible printed substrate (not shown), and the rotation detection sensor flexible substrate 8c is connected to the flexible printed substrate. The exterior is formed by assembling the second fixed cylinder 4, the third fixed cylinder 5, and the zoom ring 6 on the guide cylinder unit.

[0031] (Regarding each lens unit)

[0032] The following will refer to Figure 1 , 4 5 and 5 describe each lens unit arranged in the guide barrel unit. Figure 4 It is an exploded perspective view of each lens unit constituting the zoom mechanism. Figure 5 It is an exploded perspective view of a rear lens unit 800 which will be described later.

[0033] The first lens unit 100 includes a first lens L1 and a first lens holding frame 101 that holds the first lens L1. The first lens holding frame 101 is provided with a first bayonet protrusion 101a (see Figure 1 ), the first bayonet protrusion 101a is engaged with the first bayonet groove 9a of the guide barrel 9 to limit the movement in the optical axis direction, and the first lens holding frame 101 is radially assembled on the distal end portion of the guide barrel 9 and is axially held by the distal end portion of the guide barrel 9. The rotation direction of the first lens holding frame 101 is limited by the phase setting screw 102, and the first lens holding frame 101 does not move in the optical axis direction by the rotation of the zoom ring 6.

[0034] The second lens unit 200 includes a second lens L2, a second lens holding frame 201 holding the second lens L2, a second base 202 (moving member), etc. The second lens holding frame 201 is held by the second base 202 through a second eccentric roller 203. When the second eccentric roller 203 rotates, the second lens holding frame 201 is held to fall relative to the second base 202, and the second lens unit 200 is configured to be adjustable for recovering the optical performance degradation caused by the tolerance of each component. Moreover, the second base 202 moves through a cam track having a maximum cam intersection angle (upright) and has a maximum movement amount.

[0035] The second lens unit 200 holds a second main bearing 204 which is aligned with a second main straight groove 9d (see FIG. Figure 3 ) and the second cam groove 10c provided in the cam ring 10. The second lens unit 200 holds the second biasing metal plate 206 and the second biasing spring 207. The second biasing metal plate 206 holds the second sub-bearing 205, which is engaged with the second sub-straight groove 9g and the second cam groove 10c provided in the guide cylinder 9. The second lens unit 200 and the second biasing metal plate 206 are pulled toward each other by the second biasing spring 207 so that the clearance generated between the second main straight groove 9d, the second cam groove 10c and the second main bearing 204 can be suppressed.

[0036] With the above-described configuration, the second lens unit 200 can hold the second lens L2 with high accuracy, and can move the position of the second lens L2 in the optical axis direction by the rotation of the cam ring 10 .

[0037] The third lens unit 300 includes an aperture unit 12 (see Figure 1 ) and three lens units, the aperture unit 12 adjusts the amount of light in the interchangeable lens 1. Figure 1 As shown, the 3A lens unit 300A includes a 3A lens L3A and a 3A lens holding frame 301, which holds the 3A lens L3A and is held relative to the 3B base 304 by a 3A eccentric roller 306. That is, when the 3A eccentric roller 306 rotates in the third lens unit 300, the entire third lens unit 300 is eccentric, so that adjustment can be performed to restore the optical performance degradation caused by the tolerance of the corresponding components.

[0038] In the 3B lens unit 300B, the 3B lens L3B and the 3B lens holding frame 302 holding the 3B lens L3B are held so as to be movable in a direction orthogonal to the optical axis direction relative to the 3B base 304. The 3B lens holding frame 302 is driven to correct the influence of camera shake using an actuator (e.g., a voice coil motor). The 3B lens unit 300B is a so-called camera shake correction unit, and is screwed and fixed to the 3C lens holding frame 303.

[0039] The aperture unit 12 is screwed to the 3B base 304. The aperture unit 12 and the actuator of the camera shake correction unit are connected to the main substrate 11 through the third flexible printed substrate 308, and the main substrate 11 controls the drive commands of the aperture unit 12 and the actuator of the camera shake correction unit.

[0040] The 3C lens unit 300C includes a 3C lens L3C and a 3C lens holding frame 303, which holds the 3C lens L3C and is held relative to a third base 305 (moving member) by a third eccentric roller 307. That is, when the third eccentric roller 307 rotates in the third lens unit 300, the entire third lens unit 300 is tilted, thereby enabling adjustment to restore optical performance degradation caused by tolerances of corresponding components.

[0041] The third lens unit 300 holds a third main bearing 309 which is aligned with a rear linear groove 9e (linear groove, see Figure 3 ) engages with a third cam groove 10d provided in the cam ring 10. It should be noted that a cam groove may be provided instead of the rear linear groove 9e provided in the guide cylinder 9.

[0042] The third biasing metal plate 311 and the third biasing spring 312 are held by the third lens unit 300. The third biasing metal plate 311 holds the third sub bearing 310, which is engaged with the third sub linear groove 9h and the third cam groove 10d provided in the guide barrel 9. The third lens unit 300 and the third biasing metal plate 311 are pulled toward each other by the third biasing spring 312 so as to suppress the play generated between the rear linear groove 9e, the third cam groove 10d and the third main bearing 309.

[0043] With the above configuration, the third lens unit 300 can hold the three lens units with high accuracy, and can move the positions of the three lens units in the optical axis direction by the rotation of the cam ring 10 .

[0044] like Figure 1 As shown, the fourth lens unit 400 includes a 4A lens unit 400A and a 4B lens unit 400B. The 4A lens unit 400A includes a 4A lens L4A and a 4A lens holding frame 401 configured to hold the 4A lens L4A, and the 4B lens unit 400B includes a 4B lens L4B and a 4B lens holding frame 402 configured to hold the 4B lens L4B. The 4A lens holding frame 401 is screwed and fixed to the 4B lens holding frame 402, and the fourth lens unit 400 is held by a fourth eccentric roller 404 relative to a rear base 403 that moves along the optical axis. That is, in the fourth lens unit 400, when the fourth eccentric roller 404 rotates, the fourth lens unit 400 is eccentric relative to the rear base 403, and thus can be adjusted to restore the optical performance degradation caused by the tolerance of each component.

[0045] like Figure 5 As shown, the fifth lens unit 500 includes a fifth lens L5, a fifth lens holding frame 501 (sub-moving member) holding the fifth lens L5, and the like. Moreover, a fifth guide rod 504 is engaged with a fifth guide portion 501a and a fifth anti-vibration portion 501b of the fifth lens holding frame 501. One end of the fifth guide rod 504 is held by the rear base 403, and the other end is held by a guide rod holder 405, which is fixed to the rear base 403 by a thread. With this configuration, the fifth lens holding frame 501 is held so as to be relatively movable in the optical axis direction relative to the rear base 403. The fifth lens unit 500 can be moved by receiving a driving force of a fifth linear ultrasonic motor 503 (driving unit) via a fifth rack 502, and the fifth linear ultrasonic motor 503 is a vibration friction motor held by the rear base 403.

[0046] In addition, a scale 505 for detecting the position of the fifth unit is bonded and fixed to the fifth lens holding frame 501. A reflection pattern for detecting the position of the fifth lens holding frame 501 is provided on the surface of the scale 505 for detecting the position of the fifth unit. Moreover, a fifth position detection sensor 506 (second detection unit) provided with a light emitting unit and a light receiving unit is capable of detecting the relative position of the fifth lens holding frame 501 with respect to the rear base 403 by detecting the reflection pattern. It should be noted that the fifth lens unit 500 is a so-called focusing unit, which plays a role of a focusing function on the interchangeable lens 1 and has the highest focusing sensitivity.

[0047] The sixth lens unit 600 includes a sixth lens L6, a sixth lens holding frame 601 (sub-moving member) holding the sixth lens L6, and the like. Moreover, a sixth guide rod 604 is engaged with a sixth guide portion 601a and a sixth anti-vibration portion 601b of the sixth lens holding frame 601. One end of the sixth guide rod 604 is held by the rear base 403, and the other end thereof is held by a guide rod holder 405, and the guide rod holder 405 is fixed to the rear base 403 by a thread. With this configuration, the sixth lens unit 600 is held so as to be relatively movable relative to the rear base 403 in the optical axis direction. The sixth lens unit 600 can be moved by receiving a driving force of a sixth linear ultrasonic motor 603 (driving unit) via a sixth rack (not shown), and the sixth linear ultrasonic motor 603 is a vibration friction motor held by the rear base 403.

[0048] In addition, a scale 605 for detecting the position of the sixth unit is bonded and fixed to the sixth lens retaining frame 601. A reflection pattern for detecting the position of the sixth lens retaining frame 601 is provided on the surface of the scale 605 for detecting the position of the sixth unit. Moreover, the absolute position of the sixth lens retaining frame 601 relative to the rear base 403 can be detected by a sixth position detection sensor 606 provided with a light emitting portion and a light receiving portion. It should be noted that the sixth lens unit 600 is a so-called floating unit, which plays a role in aberration correction related to the optical axis direction in the interchangeable lens 1.

[0049] The fifth and sixth linear ultrasonic motors 503 and 603 are connected to the flexible printed substrate 406 for a driving unit. The flexible printed substrate 406 is connected to the main substrate 11 through which a driving command is transmitted to the fifth and sixth linear ultrasonic motors 503 and 603 .

[0050] It should be noted that the fifth position detection sensor 506 and the sixth position detection sensor 606 are connected to the flexible printed substrate 407 for sensing, and are connected to the main substrate 11 through the flexible printed substrate 407 for sensing. The positions of the fifth lens unit 500 and the sixth lens unit 600 are feedback-controlled through the main substrate 11, and are controlled based on a command from the main substrate 11.

[0051] The main substrate 11 is provided with a storage area for storing a positional relationship corresponding to a zoom position and an object distance between the fifth lens unit 500 and the sixth lens unit 600. Then, by moving the fifth lens unit 500 and the sixth lens unit 600 based on the recognized zoom position information, control for suppressing defocusing with respect to an object at a predetermined distance is performed.

[0052] like Figure 4 As shown, the seventh lens unit 700 includes a seventh lens L7 and a seventh lens holding frame 701 (moving member) holding the seventh lens L7. The seventh lens unit 700 holds a seventh roller 702, which is engaged with a rear linear groove 9e provided in the guide barrel 9 and a seventh cam groove 10f provided in the cam ring 10. With this configuration, the position of the seventh lens unit 700 in the optical axis direction is moved by the rotation of the cam ring 10. The rear base 403 also holds the second base 202, the third base 305 and the seventh lens holding frame 701, which are a plurality of moving members having different moving trajectories, and the zoom position detection sensor 16 detects the position of the moving members.

[0053] Although the lens units have been described above, the fourth lens unit 400, the fifth lens unit 500, and the sixth lens unit 600 constitute the rear lens unit 800. The rear lens unit 800 holds the fourth main bearing 411 (joining member, see Figure 4 ), the fourth main bearing 411 is connected with the rear linear groove 9e provided in the guide cylinder 9 and the rear cam groove 10e (cam groove, see Figure 3 ) engagement. It should be noted that a straight groove may be provided instead of the rear cam groove 10e provided in the cam ring 10. Moreover, the rear lens unit 800 holds the fourth biasing metal plate 413 and the fourth biasing spring 414. With this configuration, the position of the rear base 403 of the fourth lens unit 400 in the optical axis direction is moved by the rotation of the cam ring 10. The rear base 403 moves in the optical axis direction on the inner diameter side of the guide barrel 9, and is a lens unit other than the first lens unit 100 (the first lens unit 100 is a lens unit located closest to the object side), namely, the second lens unit 200 to the seventh lens unit 700.

[0054] The fourth biasing metal plate 413 holds the rear cam groove 10e and the fourth sub-bearing 412 engaged with the rear cam groove 10e. It should be noted that the rear cam groove 10e is a cam groove that is wider in the optical axis direction. The rear lens unit 800 and the fourth biasing metal plate 413 are pulled toward each other by the fourth biasing spring 414, so that the clearance generated between the rear linear groove 9e and the fourth main bearing 411 is offset to one side. Moreover, the fourth main bearing 411 is biased on one surface of the wider rear cam groove 10e, and the fourth sub-bearing 412 is biased on the other surface thereof. With this construction, when the cam ring 10 rotates, the rear lens unit 800 can move its position in the optical axis direction while holding the rear lens unit 800 with high precision.

[0055] The following will refer to Figure 6 and 7 A flexible substrate holder unit 410 is introduced. Figure 6 is an exploded perspective view of the flexible substrate holder unit 410 . Figure 7 is a perspective view of the flexible substrate holder unit 410 after assembly is completed.

[0056] The flexible substrate holder unit 410 is a unit that holds the flexible printed substrate 407 on the flexible substrate holder 408. The fifth position detection sensor 506 and the sixth position detection sensor 606 for detecting the position of the fifth lens unit 500 and the zoom position detection sensor 16 for detecting the zoom position are mounted on the flexible printed substrate 407 for sensing.

[0057] The following will describe a method of holding the flexible printed substrate 407 on the flexible substrate holder 408. First, the zoom position detection sensor 16 is positioned relative to the flexible metal sheet 409 with respect to the back surface of the flexible printed substrate 407 using a tool, and is fixed using a double-sided tape. Then, the flexible metal sheet 409 is fixed to the flexible substrate holder 408 by screws. The rear surface portions of the fifth position detection sensor 506 and the sixth position detection sensor 606 of the flexible printed substrate 407 are positioned relative to the flexible substrate holder 408 by a tool, and are fixed by using a double-sided tape.

[0058] The flexible substrate holder unit 410 is screwed to the rear base 403. By this holding method, the scale 505 for detecting the position of the fifth unit and the fifth position detection sensor 506, the scale 605 for detecting the position of the sixth unit and the sixth position detection sensor 606, and the zoom position detection scale 14 and the zoom position detection sensor 16 are all held with desired orientation accuracy.

[0059] Figure 8: is a top view of the rear lens unit 800, which shows the position of the zoom position detection sensor 16 in the rear lens unit 800 along the optical axis direction. When viewed from a direction orthogonal to the optical axis direction, the distance from the holding position of the fourth main bearing 411 to the detection center position of the zoom position detection sensor 16 (the zoom position detection sensor 16 is held by the rear base 403) is represented by LS. Moreover, LL is the distance from the holding position of the fourth main bearing 411 to one end 403a of the rear base 403 on the near side, and LR is the distance from the holding position of the fourth main bearing 411 to the other end 403b of the rear base 403 on the far side. At this time, LS≤LR / 2, and the zoom position detection sensor 16 is maintained within this range. With this construction, since the zoom position detection sensor 16 can be arranged at a position close to the fourth main bearing 411 along the optical axis direction, the deviation in position detection can be reduced.

[0060] Fig. 9 is a side view of the rear lens unit 800 when viewed from the object side along the optical axis direction. When viewed from the optical axis direction, the closest angle from the holding position of the fourth main bearing 411 of the rear base 403 to the detection center position of the zoom position detection sensor 16 held by the rear base 403 is represented by θS. Moreover, when the angle between the holding positions of adjacent fourth main bearings 411 held by the rear base 403 is θ, a relationship of θS≤θ / 3 is established for any one of the fourth main bearings 411, and the zoom position detection sensor 16 is held within this range. With this configuration, since the zoom position detection sensor 16 can be arranged at a position close to the fourth main bearing 411 in the circumferential direction of the optical axis direction, it is possible to reduce deviation in position detection.

[0061] With the above configuration, it is possible to suppress the amount of output fluctuation of the zoom position detection sensor 16 when the tilt fluctuation of the rear lens unit 800 occurs. Therefore, according to the embodiment, it is possible to provide an optical apparatus capable of suppressing focus movement due to zoom change at the start of a zoom reversal operation.

[0062] Fig.10 1 is a diagram showing output characteristics of the rotation detection sensor 8 (dashed line) and the zoom position detection sensor 16 (solid line) of the zoom ring 6. The rotation detection sensor 8 and the zoom position detection sensor 16 are both capable of detecting an absolute position corresponding to a zoom position.

[0063] The zoom position detection sensor 16 is a detector that detects an absolute position, but due to the detection pattern of the zoom position detection scale 14 of the embodiment, there are two positions where the zoom position and the output of the zoom position detection sensor 16 are the same output. For example, the output of the zoom position detection sensor 16 at positions P1 and P2 in the view is both 16S. However, by combining the low-level sensor output value 8SL and the high-level sensor output value 8SH of the rotation detection sensor 8, it is possible to correctly detect whether the current zoom position is position P1 or position P2. By using this method, the embodiment can be applied to a slightly complicated cam trajectory.

[0064] In the zoom position detection according to the present disclosure, the relative position of the rear lens unit 800 with respect to the guide barrel 9 is converted into a zoom position and recognized by detecting the output of the zoom position detection sensor 16 held by the rear lens unit 800. In this configuration, since the position change of the lens unit is directly detected, the zoom position can be detected with a smaller delay with respect to the change in the lens position, compared with the case where the zoom position is detected by the rotation detection sensor 8, for example.

[0065] In the embodiment, the position of the rear lens unit 800 of the fifth lens unit 500 (focusing group) having high focus sensitivity is maintained to be converted into the zoom position. In other words, the position change of the lens unit having a large influence on the focus movement at the time of zooming is directly detected, and the fifth lens unit 500 can be used to change the focus position accordingly with little delay, so that the focus movement accompanying the zoom change can be reduced.

[0066] In the embodiment, the configuration for detecting the position of the rear lens unit 800 including the fifth lens unit 500 having high focus sensitivity has been described. However, the present disclosure is not limited thereto, and a group that effectively suppresses focus movement at the time of zoom reversal operation, such as a group with a large movement amount or a group with a large (upright) cam intersection angle in the cam track, may be selected.

[0067] (Application Examples)

[0068] Fig.11 1 is a schematic diagram showing an example of the construction of a camera device 20 (imaging device) using an interchangeable lens 1 to which the present disclosure is applied. The imaging device includes the interchangeable lens 1 and the camera device 20, which includes a camera body 20a having an image sensor 20b for capturing an image formed by the interchangeable lens 1. The imaging device has a construction in which the interchangeable lens 1 is detachably attached to the camera body 20a of the camera device 20, but the camera body 20a and the interchangeable lens 1 may be provided integrally.

[0069] Although the preferred embodiments of the present disclosure have been described above, the present invention is not limited to these embodiments, and various changes and modifications can be made within the scope of the spirit of the present invention.

[0070] Although embodiments of the present invention have been described, it is to be understood that the invention is not limited to the disclosed example embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. An optical device, comprising: Fixed components, a base moving member, wherein the base moving member moves along the optical axis direction, a rotating member rotatably held relative to the fixed member, and a detection unit, the detection unit being configured to directly detect the relative position between the base moving member and the fixed member, wherein the base moving member holds an engaging member engaged with one of a linear groove and a cam groove provided in the fixed member and one of a cam groove and a linear groove provided in the rotating member, and The base moving member is moved along the optical axis direction by the rotation of the rotating member.

2. An optical device according to claim 1, wherein: The base moving member holds at least one sub-moving member, and the sub-moving member is held so as to be relatively movable along the optical axis direction relative to the base moving member. The sub-moving member is moved by a driving unit held by the base moving member.

3. The optical device according to claim 1, wherein: The base moving member moves in the optical axis direction on the inner diameter side relative to the fixed member, and holds lens units other than a lens unit located closest to the object.

4. The optical device according to claim 1, wherein: The base moving member holds a plurality of moving members having different moving trajectories, The detection unit detects a position of any one of a moving member having a maximum cam intersection angle, a moving member having a maximum movement amount, and a moving member having a highest focus sensitivity among the plurality of moving members.

5. The optical device according to claim 1, wherein: The detection unit comprises a scaling part provided with a pattern and a detection part arranged to detect the pattern, and Among them, one of the zoom part and the detection part is held by the fixing member, and the other of the zoom part and the detection part is held by the base moving member.

6. An optical device according to claim 5, wherein: When viewed from a direction orthogonal to the optical axis direction, when the distance from the holding position of the engaging member of the base moving member to the detection center position of the detection portion held by the base moving member is LS and the distance from the holding position of the engaging member to the end of the end portion of the base moving member on the longer side is LR, The detection unit remains within the following range: LS≤LR / 2.

7. The optical device according to claim 5, wherein: When viewed from the optical axis direction, for any one of the engaging members, when the angle from the holding position of the engaging member of the base moving member to the detection center position of the detection portion held by the base moving member is θS and the angle between adjacent engaging members held by the base moving member is θ, The detection unit remains within the following range: θS≤θ / 3.

8. The optical device according to claim 2, wherein: The base moving member holds a second detector that detects a relative position of the sub moving member with respect to the base moving member.

9. An imaging device comprising: An optical device according to any one of claims 1 to 8 and an image sensor arranged to capture an image formed by the optical device.

Images