Lens device and imaging system

Abstract

To provide a highly reliable lens device that is applicable to various optical configurations.SOLUTION: A lens device (101) has: a holding member (502) that holds an optical member (501) movably between a first position on an optical axis of an imaging optical system and a second position retreated from the optical axis; a first member (503) that holds the holding member movably in a direction orthogonal to the optical axis; a second member (504) that holds the first member movably in a direction orthogonal to the optical axis; a third member (107) that is adjacent to the second member; a first contact part (506) that is in contact with the holding member when the optical member moves from the first position to the second position; and a second contact part (508) that is in contact with the holding member when the optical member is at the second position.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a lens device and an imaging system.

Background Art

[0002] Conventionally, a lens device having a configuration for suppressing deterioration of the characteristics of a damping member provided to suppress over-correction driving of an image stabilization lens is known. Patent Document 1 discloses an image stabilization device that is less likely to cause changes over time in a damping member. Patent Document 2 discloses a configuration for holding an image stabilization lens at the center of the optical axis during non-shooting in order to prevent breakage of a damping member.

[0003] In recent years, a lens device has been known that realizes shortening of the overall length by retracting an image stabilization lens from the optical axis of an imaging optical system in a retracted barrel state. When retracting the image stabilization lens, a movable group is provided that is held movably in a direction perpendicular to the optical axis so as to exhibit image stabilization, and the movable group holds the image stabilization lens rotatably. Patent Document 3 discloses a configuration in which a protrusion is provided on a cylindrical member adjacent to the movable group, and the protrusion and the movable group are brought into contact with each other during non-shooting to hold the movable group at the center of the optical axis.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the configuration disclosed in Patent Document 1, there is a possibility that reliability cannot be ensured when vibration, impact, etc. are applied from the outside. In the configuration disclosed in Patent Document 2, when pressing the holding member that holds the shake correction lens in the optical axis direction, an excessive load is applied to the ball member that is in contact with the holding member, and there is a possibility that dents or the like may be formed on the shake correction device. In the configuration disclosed in Patent Document 3, when shifting from the photographable state to the retracted lens barrel state, the shake correction device needs to move relatively within the optical device, and it cannot be applied to various optical configurations.

[0006] Therefore, an object of the present invention is to provide a highly reliable lens device applicable to various optical configurations.

Means for Solving the Problems

[0007] A lens device according to one aspect of the present invention includes a holding member that movably holds an optical member between a first position on the optical axis of an imaging optical system and a second position retracted from the optical axis, a first member that movably holds the holding member in a direction orthogonal to the optical axis, a second member that movably holds the first member in the direction orthogonal to the optical axis, a third member adjacent to the second member, a first contact portion that contacts the holding member when the optical member moves from the first position to the second position, and a second contact portion that contacts the holding member in a state where the optical member is at the second position.

[0008] Other objects and features of the present invention will be described in the following embodiments.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a highly reliable lens device and an imaging system applicable to various optical configurations.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same reference numerals throughout the drawings indicate the same or corresponding parts. In this embodiment, an interchangeable lens, which is an example of an optical device, will be described. However, the present invention can be variously modified and changed within the scope of its gist, such as in a lens-integrated camera.

[0012] First, referring to FIGS. 1(a) and 1(b), the imaging system 100 in this embodiment will be described. FIGS. 1(a) and 1(b) are external perspective views of the imaging system 100. FIG. 1(a) shows a perspective view seen from the front side (subject side), and FIG. 1(b) shows a perspective view seen from the back side (image plane side). In this embodiment, as shown in FIG. 1(a), the optical axis direction, which is the direction in which the optical axis OA of the imaging optical system accommodated in the interchangeable lens 101 extends (the direction along the optical axis), is defined as the X-axis direction, and the directions orthogonal to the optical axis direction are defined as the Z-axis direction (horizontal direction) and the Y-axis direction (vertical direction). Hereinafter, the Z-axis direction and the Y-axis direction are also collectively referred to as the Z / Y-axis direction. Also, the rotation direction around the Z-axis is defined as the Pitch direction, and the rotation direction around the Y-axis is defined as the Yaw direction. The Pitch direction and the Yaw direction (hereinafter, also collectively referred to as the Pitch / Yaw direction) are rotation directions around two orthogonal axes, the Z-axis and the Y-axis.

[0013] The imaging system 100 includes a camera body (digital camera, imaging device) 1 and an interchangeable lens (lens device, lens barrel) 101 that is detachable from the camera body 1. However, this embodiment is not limited thereto, and it is also applicable to an imaging device in which the camera body and the lens device are integrally configured.

[0014] On the left side of the camera body 1 when viewed from the front (right side when viewed from the back), a grip portion 2 for the user to hold the camera body 1 by hand is provided. Also, a power operation portion 3 is arranged on the upper surface portion of the camera body 1. When the user turns on the power operation portion 3 when the camera body 1 is in the power-off state, power supply is started and the camera body 1 becomes in the power-on state, and a computer program such as the origin detection process of the focus group is executed to enter the shooting standby state. Note that the imaging system 100 of this embodiment detects that the interchangeable lens 101 is mechanically and electrically connected even when the camera body 1 is in the power-off state, starts power supply from the camera body 1 to the interchangeable lens 101, and executes the origin detection process of the focus group. When the user turns off the power operation portion 3 when the camera body 1 is in the power-on state, the camera body 1 becomes in the power-off state.

[0015] On the upper surface of the camera body 1, a mode dial 4, a release button 5, and an accessory shoe 6 are provided. By rotating the mode dial 4 by the user, the shooting mode can be switched. The shooting modes include a manual still image shooting mode in which the user can arbitrarily set shooting conditions such as shutter speed and aperture value, an auto still image shooting mode in which an appropriate exposure amount can be obtained automatically, and a movie shooting mode for shooting movies. Also, by the user pressing the release button 5 halfway, shooting preparation operations such as autofocus and automatic exposure control can be instructed, and by pressing it fully, shooting can be instructed. An accessory such as an external flash or a lighting or light-emitting device accessory (camera accessory) can be detachably attached to the accessory shoe 6.

[0016] The interchangeable lens 101 includes a lens mount (second mount) 102 that can be mechanically and electrically connected to a camera mount (first mount) 7 provided on the camera body 1. An imaging optical system that forms a subject image by forming an image of light from the subject is housed in the interchangeable lens 101. On the outer periphery of the interchangeable lens 101, a zoom operation ring (operating member) 103 that can be rotated by the user about the optical axis OA (around the optical axis) is provided. When the zoom operation ring 103 is rotated by the user, the zoom group that constitutes the imaging optical system moves to a predetermined use position corresponding to the angle of the zoom operation ring 103 within the range from the wide-angle end to the telephoto end. Thereby, the user can shoot at a desired angle of view. Also, as will be described later, in the present embodiment, a retracted end where shooting is further restricted is provided at the position where the interchangeable lens 101 is rotated from the telephoto end to the wide-angle end. The retracted end is the position where the interchangeable lens 101 is most retracted.

[0017] As shown in FIG. 1(b), a rear operation unit 8 and a display unit 9 are provided on the back surface of the camera body 1. The rear operation unit 8 includes a plurality of buttons and dials to which various functions are assigned. When the power of the camera body 1 is on and the still image or video shooting mode is set, a through image of the subject image captured by the image sensor described later is displayed on the display unit 9. In addition, shooting parameters indicating shooting conditions such as shutter speed and aperture value are displayed on the display unit 9, and the user can change the set value of the shooting parameters by operating the rear operation unit 8 while viewing the display. The rear operation unit 8 includes a playback button for instructing the playback of the recorded shooting image. When the user operates the playback button, the shooting image is played back and displayed on the display unit 9. Note that the display unit 9 may be a touch panel type and have the same function as the rear operation unit 8.

[0018] Next, with reference to FIG. 2, the electrical and optical configurations of the imaging system 100 will be described. FIG. 2 is a block diagram of the imaging system 100. The camera body 1 includes a power supply unit 10 that supplies power to the camera body 1 and the interchangeable lens 101, a power operation unit 3, a mode dial 4, a release button 5, and an operation unit 11 including the touch panel function of the rear operation unit 8 and the display unit 9. The overall system control of the camera body 1 and the interchangeable lens 101 in the present embodiment is performed by the camera control unit 12 provided in the camera body 1 and the lens control unit 104 provided in the interchangeable lens 101 cooperating with each other. Note that a computer for controlling the camera body 1 and the interchangeable lens 101 is built into each of the camera control unit 12 and the lens control unit 104, and the overall system of the camera body 1 and the interchangeable lens 101 is controlled by operating them in cooperation.

[0019] The camera control unit 12 reads and executes the computer program stored in the storage unit 13. At this time, the camera control unit 12 communicates with the lens control unit 104 via the communication terminal of the electrical contact 105 provided on the lens mount 102 for various control signals, data, etc. The electrical contact 105 includes a power supply terminal that supplies power from the power supply unit 10 described above to the interchangeable lens 101.

[0020] The imaging optical system of the interchangeable lens 101 is connected to the zoom operation ring 103 and has a zoom group 110 that moves in the optical axis direction to change the angle of view, and an image stabilization device 112 that includes an image stabilization lens (optical member). The image stabilization device 112 reduces image blur by moving (shifting) in the Z / Y-axis direction orthogonal to the optical axis OA. Further, the imaging optical system has a diaphragm group (aperture diaphragm group) 301 that performs a light amount adjustment operation, and a focus group 114 that includes a focus lens that moves in the optical axis direction to perform focus adjustment (focusing). Furthermore, the interchangeable lens 101 has an anti-shake drive unit 201 that moves the image stabilization device 112, a diaphragm drive unit 302 that drives the diaphragm group 301, and a focus drive unit 401 that moves the focus group 114.

[0021] The camera body 1 has a shutter unit 14, a shutter drive unit 15, an imaging element 16, an image processing unit 17, and a camera control unit 12. The shutter unit 14 controls the amount of light that is imaged by the imaging optical system in the interchangeable lens 101 and exposed by the imaging element 16. The imaging element 16 photoelectrically converts the subject image formed by the imaging optical system and outputs an imaging signal. The image processing unit 17 performs various image processes on the imaging signal and then generates an image signal. The display unit 9 displays the image signal (through image) output from the image processing unit 17, displays the shooting parameters, or reproduces and displays the captured image recorded in the storage unit 13 or a recording medium (not shown).

[0022] The camera control unit 12 controls the focus drive unit 401 in response to a shooting preparation operation (such as a half-press operation of the release button 5) in the operation unit 11. For example, when the autofocus operation is instructed, the focus detection unit 18 determines the focus state of the subject image formed on the imaging device 16 based on the image signal generated by the image processing unit 17, generates a focus signal, and transmits it to the camera control unit 12. At the same time, the focus drive unit 401 transmits information about the current position of the focus group 114 to the camera control unit 12. The camera control unit 12 compares the focus state of the subject image with the current position of the focus group 114, calculates the focus drive amount from the deviation amount, and transmits it to the lens control unit 104. Then, the lens control unit 104 moves the focus group 114 to the target position in the optical axis direction via the focus drive unit 401 to correct the focus shift of the subject image.

[0023] The focus drive unit 401 includes a focus motor 401a that functions as an actuator, and a photointerrupter (detection unit) 148 that detects the origin position of the focus group 114. Generally, a stepping motor, which is a type of actuator, is often adopted as the focus motor 401a. However, since the stepping motor can only control the relative drive amount, the current position of the focus group 114 becomes indeterminate when the power of the camera body 1 is off. In this case, the current position of the focus group 114 cannot be detected.

[0024] Here, assume a case where the interchangeable lens 101 is mechanically removed from the camera mount 7 of the camera body 1 or the like while the camera body 1 is powered on, interrupting the power supply to the interchangeable lens 101. In this case, the focus group 114 is held at the position at the time of power interruption and becomes undetectable. When the user turns on the power operation unit 3 from such a state where the current position of the focus group 114 is indeterminate, the focus group 114 must be moved to the origin position once first and the origin detection process must be executed before reaching the shooting standby state.

[0025] Note that, as the focus motor 401a, a DC motor equipped with an encoder, an ultrasonic motor, a servo motor, or the like may be adopted. Further, although the photointerrupter 148 directly receives the light emitted from the light emitting part by the light receiving part, instead of this, a photoreflector that receives the reflected light from the reflecting surface, or a brush that contacts the conductive pattern and electrically detects a signal may be used as the detection part.

[0026] The camera control unit 12 controls the driving of the aperture group 301 and the shutter unit 14 via the aperture driving unit 302 and the shutter driving unit 15 according to the set value of the aperture value or the shutter speed received from the operation unit 11. For example, when the operation of automatic exposure control is instructed, the camera control unit 12 receives the luminance signal generated by the image processing unit 17 and performs photometry calculation. Based on the result of this photometry calculation, the camera control unit 12 controls the aperture driving unit 302 according to the shooting instruction operation (such as the full press operation of the release button 5) in the operation unit 11. At the same time, the camera control unit 12 controls the driving of the shutter unit 14 via the shutter driving unit 15, and performs the exposure process by the imaging element 16.

[0027] The camera body 1 has a pitch shake detection unit 19 and a yaw shake detection unit 20 as shake detection means capable of detecting image shake due to the user's hand shake or the like. The pitch shake detection unit 19 and the yaw shake detection unit 20 respectively use an angular velocity sensor (vibration gyro) or an angular acceleration sensor to detect image shake in the pitch direction (the rotation direction around the Z axis) and the yaw direction (the rotation direction around the Y axis), and output a shake signal.

[0028] The camera control unit 12 calculates the shift position in the Y-axis direction of the shake correction device 112 using the shake signal from the pitch shake detection unit 19. Similarly, the camera control unit 12 calculates the shift position in the Z-axis direction of the shake correction device 112 using the shake signal from the yaw shake detection unit 20. Then, the camera control unit 12 moves the shake correction device 112 to the target position in the Z / Y-axis direction via the anti-shake driving unit 201 according to the calculated shift position in the pitch / yaw direction, and reduces the image shake during exposure and during through-image display.

[0029] The interchangeable lens 101 includes a zoom operation ring 103 for changing the angle of view of the imaging optical system, and a zoom detection unit 106 that detects the angle of the zoom operation ring 103. The zoom detection unit 106 detects the angle of the zoom operation ring 103 operated by the user as an absolute value, and is configured using, for example, a resistive linear potentiometer. Information regarding the angle of view detected by the zoom detection unit 106 is transmitted to the lens control unit 104 and reflected in various controls by the camera control unit 12 described above. On the other hand, a part of the various information described above is recorded in the storage unit 13 or a recording medium (not shown) together with the captured image.

[0030] Next, with reference to FIGS. 3 to 5, the positional relationship of the main components in the interchangeable lens 101 will be described. FIGS. 3 to 5 are cross-sectional views on the XY plane including the optical axis OA, and the center line shown here substantially coincides with the optical axis OA determined by the imaging optical system, and thus will be synonymous with the optical axis OA hereinafter.

[0031] FIG. 3 shows the wide-angle end on the short focal length side in zoom, and FIG. 4 shows the telephoto end on the long focal length side in zoom. Both FIGS. 3 and 4 show a state where the imaging optical system of the interchangeable lens 101 is in a photographable position (a state where photography is possible). On the other hand, FIG. 5 shows that the imaging optical system of the interchangeable lens 101 is in a housed state (a state in the retracted barrel position) when not in use. Further, FIG. 5 shows the retracted barrel end with the shortest overall length in the optical axis direction.

[0032] The telescopic end shown in Fig. 5 is provided further ahead of the wide-angle end in Fig. 3. By rotating the zoom operation ring 103 in one direction, the telescopic end in Fig. 5 shifts to the wide-angle end in Fig. 3, and then from the wide-angle end shown in Fig. 3 to the telephoto end shown in Fig. 4 in sequence. In the present embodiment, the state in which imaging by the imaging optical system is possible is defined as the shooting state, and the state in which the imaging optical system is in the telescopic position is defined as the telescopic state. Note that the state in which shooting is possible means that the functions of the imaging system 100 including the camera body 1 and the interchangeable lens 101 can always operate normally. That the shooting is restricted means that at least a part of the functions of the imaging system 100 including the camera body 1 and the interchangeable lens 101 do not operate normally. For example, in the state where the imaging optical system is in the telescopic position, the shooting act itself (for example, pressing the shutter to shoot a subject) is possible, but due to an event such as the focus of the captured image not being in focus, the whole or part of the image may become blurred.

[0033] As shown in Figs. 3 and 4, in the present embodiment, an optical system having a six-group configuration is adopted as an example of the imaging optical system. The zoom group 110 moves to different predetermined use positions at the wide-angle end and the telephoto end respectively, and forms an image of light from the subject on the imaging element 16. The zoom group 110 is composed of a first zoom group 111, an image stabilization device (second zoom group) 112, a diaphragm group 301, a third zoom group 113, a focus group (fourth zoom group) 114, a fifth zoom group 115, and a sixth zoom group 116. In the present embodiment, the configuration of the imaging optical system is not limited. For example, at least one of the image stabilization device 112 and the focus group 114 may function as another zoom group. Also, some lens groups may not be movable and may be fixed.

[0034] The straight - advance guide cylinder (the third frame body, the third member) 107 is a fixed part that is arranged adjacent to the fixed member 504 and fixed to the lens mount 102 via a fixed cylinder (not shown). Bayonet claws (not shown) are arranged at equal - division positions on the outer peripheral surface of the straight - advance guide cylinder 107. On the other hand, a follower (not shown) is provided on the inner peripheral surface of the cam cylinder 108. The cam cylinder 108 is connected to the zoom operation ring 103 via a key (not shown). When the user rotates the zoom operation ring 103, the cam cylinder 108 rotates about the optical axis OA while advancing and retreating (moving) in the optical - axis direction due to the engagement of the cam groove and the follower.

[0035] On the straight - advance guide cylinder 107, straight - advance guide grooves are formed at equal - division positions to restrict the movement of the zoom group 110 in the rotation direction and guide the straight - advance in the optical - axis direction. On the cam cylinder 108, cam grooves having trajectories at different angles in the rotation direction are formed at equal - division positions corresponding to the zoom group 110. On the other hand, a plurality of followers are provided on the zoom group 110, and each follower is engaged with the corresponding straight - advance guide groove and cam groove. When the user rotates the zoom operation ring 103, the cam cylinder 108 rotates, and the followers restrict the movement in the rotation direction while advancing and retreating (moving) the zoom group 110 in the optical - axis direction due to the engagement of the straight - advance guide groove and the cam groove.

[0036] At the wide - angle end shown in FIG. 3, the distance between the first zoom group 111 and the image - stabilization device (the second zoom group) 112 is widened. Also, at the telephoto end shown in FIG. 4, the distance between the fifth zoom group 115 and the sixth zoom group 116 is widened. The retracting mechanism narrows the distance between each zoom group in this way and moves them to the storage positions where they are close to each other, shortening the overall length in the optical - axis direction. As shown in FIG. 5, at the retracted end during non - shooting, the zoom group 110 has moved to the storage positions where they are close to each other. From this state, for example, when the user rotates the zoom operation ring 103 to the wide - angle end, the zoom group 110 extends to the front side (the subject side) and moves to a predetermined use position, reaching the shooting state shown in FIG. 3.

[0037] Next, with reference to FIG. 6, the configurations of the shake correction device 112, the straight - guide cylinder 107, and the cam cylinder 108 will be described. FIG. 6 is an exploded perspective view of the shake correction device 112, the straight - guide cylinder 107, and the cam cylinder 108, showing a state in which some of the components are disassembled and viewed obliquely from the front.

[0038] First, the arrangement of the shake correction device 112 inside the interchangeable lens 101 will be described. The fixed member (second frame body, second member) 504 holds the movable member 503 so as to be movable in a direction perpendicular to the optical axis OA. On the outer peripheral portion of the fixed member 504, followers 109 are provided at three positions at substantially equal intervals in the circumferential direction. Each of these three followers 109 engages with three cam grooves 702 formed on the inner peripheral portion of the cam cylinder 108, and the movement in the direction perpendicular to the optical axis OA (optical - axis perpendicular direction) is restricted by the straight - guide groove 701 of the straight - guide cylinder 107. As a result, the movable member (first frame body, first member) 503 is supported by the cam cylinder 108 and the straight - guide cylinder 107 so as to be able to advance and retreat in the optical - axis direction, and the shake correction device 112 is supported so as to be able to advance and retreat in the optical - axis direction.

[0039] When the user rotates the zoom operation ring 103, the cam cylinder 108 rotates, and the follower 109 advances and retreats (moves) the shake correction device 112 in the optical - axis direction while restricting the movement in the optical - axis perpendicular direction by the engagement of the straight - guide groove 701 and the cam groove 702. As described above, in the present embodiment, a retracting mechanism is adopted in which each lens group including the shake correction device 112 moves closer to each other and approaches the storage position with a reduced interval during non - shooting, thereby shortening the overall length in the optical - axis direction.

[0040] Also, in the present embodiment, a lens retraction mechanism is provided to achieve further shortening of the overall length. The lens retraction mechanism retracts the shake correction lens (optical member) 501 and the holding member 502 from the optical axis OA of the imaging optical system, and allows the front and rear lens groups, for example, the first zoom group 111, to enter the vacated space. Thereby, the overall length in the optical - axis direction in the retracted state can be shortened.

[0041] Next, with reference to FIGS. 7 and 8, the image stabilizer 112 having a lens retraction mechanism in the present embodiment will be described. FIG. 7 is a front perspective view of the image stabilizer 112 in the shooting state. FIG. 8 is a front perspective view of the image stabilizer 112 in the retracted state.

[0042] The movable member 503 is fitted to the holding member 502 in parallel with the optical axis OA, and holds the holding member 502 so as to be movable in a direction orthogonal to the optical axis OA. The movable member 503 is rotatable about an axis parallel to the optical axis OA, and the image stabilization lens 501 can move back and forth (move) between the shooting position and the retracted position. A torsion spring (not shown) composed of a torsion spring portion and a compression spring portion is externally inserted into a part of the holding member 502. In the shooting state, the holding member 502 is biased by the torsion spring to the movable member 503. When performing image stabilization, the holding member 502 and the movable member 503 are integrated and move in a direction orthogonal to the optical axis. In this way, the holding member 502 holds the image stabilization lens 501 so as to be movable between a shooting possible position (first position) on the optical axis of the imaging optical system and a retracted position (second position) retracted from the optical axis.

[0043] The lever member (fourth member) 505 has a tip portion (first contact portion) 506 for contacting (abutting) and pushing out the holding member 502, and a terminal portion 507 that is pushed out as the cam cylinder 108 rotates. When shifting from the shooting state (shooting position) to the retracted state (retracted position), with the retraction of the interchangeable lens (lens barrel) 101, a notch provided in the cam cylinder 108 contacts and pushes out the terminal portion 507 of the lever member 505. As a result, the lever member 505 rotates about an axis parallel to the optical axis OA, the tip portion 506 of the lever member 505 contacts (abuts) a part (contact portion 510) of the holding member 502, and the holding member 502 is pushed out. In this way, the holding member 502 is moved to the retracted position.

[0044] FIG. 9(a) is a rear view of the image stabilization device 112 in the photographing state. FIG. 9(b) is a cross-sectional view taken along line A-A in FIG. 9(a). The image stabilization device 112 mainly includes an image stabilization lens 501, a holding member 502 that holds the image stabilization lens 501, a movable member 503, a fixed member 504 that supports them so as to be movable in a direction perpendicular to the optical axis, and an anti-vibration drive unit 201.

[0045] The anti-vibration drive unit 201 is composed of a yoke 202 and a magnet 203 attached to the movable member 503, and a coil 204 and a shield unit 205 attached to the fixed member 504. When a pair of coils 204 is energized, a Lorentz force is generated between the magnetism of the pair of magnets 203. Due to the Lorentz force, the magnets 203, the holding member 502, and the movable member 503 can move in a direction perpendicular to the optical axis. The yoke 202 and the shield unit 205 are arranged to shield the magnetism generated when the coil 204 is energized and prevent it from affecting the imaging element 16.

[0046] A pair of Hall elements 207 are mounted on a flexible printed circuit board (not shown). The pair of Hall elements 207 are arranged at positions facing the pair of magnets 203 in the optical axis direction and are held by the movable member 503. The Hall element 207 detects changes in the direction and magnitude of the magnetic force of the pair of magnets 203, and based on the detection result, the camera control unit 12 provided in the camera body 1 obtains the position of the holding member 502 with respect to the Hall element 207. At this time, the camera control unit 12 controls the voltage applied to the pair of coils 204 based on the image shake information of a gyro sensor (not shown) provided in the camera body 1, and moves the holding member 502 and the movable member 503 in a direction perpendicular to the optical axis. In this way, the holding member 502 and the movable member 503 that hold the image stabilization lens 501 are moved in the direction of correcting image shake. Thereby, it is possible to correct image shake due to vibrations such as hand shake of the subject image formed on the imaging element 16 through the imaging optical system, and obtain an image and video without image shake.

[0047] When the holding member 502 moves in the direction orthogonal to the optical axis by the anti-vibration driving unit 201, the rolling balls 209 in the ball groove 208 are in contact with the holding member 502 and the movable member 503, respectively. The holding member 502 is biased in the optical axis direction with respect to the movable member 503 by the spring portion 206, and is housed so as to be rollable in the direction orthogonal to the optical axis while the rolling balls 209 are sandwiched between the holding member 502 and the movable member 503.

[0048] The shake correction device 112 has a holding member 502 that holds the shake correction lens 501. Further, the shake correction device 112 has a damping member 601 in order to reduce over-correction of image shake caused by the anti-vibration driving unit 201 that moves the holding member 502 in the direction orthogonal to the optical axis with respect to the movable member 503. The damping member 601 is provided between the holding member 502 and the movable member 503 and the fixed member 504, and exerts a braking action on the movement of the holding member 502 in the direction orthogonal to the optical axis of the imaging optical system.

[0049] The damping member 601 is used to make it difficult to be affected by vibrations (such as resonance) due to external factors and the like. In other words, the damping member 601 is arranged to obtain a damper effect for improving the controllability of the shake correction device 112. As the damping member 601, in the present embodiment, a viscoelastic body is adopted, and in particular, an ultraviolet curable silicone gel excellent in ease of incorporation and environmental resistance is used.

[0050] First, a fixed member 504 having a damping member mounting portion 603 is placed on a horizontal table (not shown). Subsequently, a transparent sheet 602 is laid under the damping member mounting portion 603, and the damping member 601, which is an ultraviolet curable silicone gel, is injected onto the transparent sheet 602. The ultraviolet curable silicone gel is in a liquid state with a low viscosity before curing at the time of injection. Since the damping member mounting portion 603 is placed on a horizontal table (not shown) with the opening facing upward, it is possible to suppress the damping member 601 from overflowing from the opening.

[0051] After injecting the damping member 601 into the damping member mounting portion 603, irradiate the damping member 601 with ultraviolet rays from the optical axis direction to cure it. In this embodiment, the damping member 601 is not limited to an ultraviolet curable silicone gel. Also, the damping member 601 is not limited to a viscoelastic body, and a mechanical mechanism using various methods such as a pressure type or a magnetic type may be adopted. Further, the holding member 502 and the movable member 503 are in contact with the damping member 601 via the protruding portions 604 protruding from the holding member 502 and the movable member 503.

[0052] Next, with reference to FIGS. 10(a) and (b), the mechanism and method for centrally holding the holding member 502 in this embodiment will be described. FIG. 10(a) is a rear view of the image stabilization device 112 in the retracted state. FIG. 10(b) is a cross-sectional view taken along line B-B in FIG. 10(a). FIG. 11 is a cross-sectional view for explaining the central holding mechanism and holding method of the image stabilization device 112 (lens retracting mechanism).

[0053] When shifting from the shooting state to the retracted state, due to the rotation of the cam cylinder 108, the end portion 507 is pushed, and the lever member 505 rotates around an axis parallel to the optical axis OA. The tip portion (first contact portion) 506 of the lever member 505 contacts the contact portion 510 provided on the holding member 502, pushes out the holding member 502, and rotates the holding member 502 so as to retract the optical axis of the image stabilization lens 501 from the optical axis OA of the imaging optical system. At this time, the movable member 503 that rotatably holds the holding member 502 receives a force in the direction in which the lever member 505 is pushed out and moves relative to the fixed member 504.

[0054] However, the holding member 502 contacts a restricting portion (second contact portion) 508 provided on the fixed member 504 at the rotated tip. As a result, the holding member 502 moves to a predetermined position with reference to the movable member 503 regardless of the presence or absence of contact with the restricting portion 508, but the movable member 503 is pushed back by the restricting portion 508. The relative position of the movable member 503 that holds the holding member 502 with respect to the fixed member 504 is determined by the contact portion 510 and the restricting portion 508.

[0055] Thus, the interchangeable lens 101 has a lever member 505 (tip portion 506) that abuts against the holding member 502 when the image stabilization lens 501 moves from the photographable position to the retracted position. The interchangeable lens 101 also has a restricting portion 508 that abuts against the holding member 502 with the image stabilization lens 501 in the retracted position.

[0056] In the present embodiment, the tip portion (first abutting portion) 506 is provided on the lever member 505 that moves the holding member 502 when the interchangeable lens 101 shifts to the retracted state. Note that the lever member 505 may be provided on the fixing member 504 or the linear guide cylinder 107. Also, the first abutting portion may be provided on the fixing member 504 or the linear guide cylinder 107. In the present embodiment, the restricting portion (second abutting portion) 508 is provided on the fixing member 504, but it may be provided on the linear guide cylinder 107. In the present embodiment, when the holding member 502 abuts against the restricting portion 508, the movable range of the movable member 503 is narrower in the retracted state (the state where the image stabilization lens 501 is in the retracted position) than in the photographable state (the state where the image stabilization lens 501 is in the photographable position).

[0057] Thereafter, the rotation stopper (restricting portion) 509 provided on the fixing member 504, like the lever member 505, obtains power from the cam cylinder 108 and moves (rotates), and a part of the rotation stopper 509 abuts against the movable member 503 to further restrict the movement of the movable member 503. Thus, the rotation stopper 509 abuts against the movable member 503 when shifting from the photographable state to the retracted state. In the present embodiment, the rotation stopper 509 is provided on the fixing member 504, but it is not limited thereto, and it may be provided on the linear guide cylinder 107, for example. Thereby, the relative state relationship between the damping member 601 and the protrusion 604 when the optical axis OA of the imaging optical system and the optical axis of the image stabilization lens 501 substantially coincide with each other is maintained.

[0058] According to this embodiment, in the interchangeable lens 101 equipped with a lens retraction mechanism, the movement of the movable member 503 in the retracted state is restricted. As a result, for example, the damping member 601 can be protected from vibrations caused by carrying or impacts due to accidental dropping, and changes in the characteristics of the damping member 601 can be suppressed. Consequently, it is possible to suppress a decrease in the performance of the image stabilization device 112.

[0059] Note that the configuration of this embodiment or each member etc. is not limited to the described content, and various configurations or members can be used as long as the function is satisfied. For example, in this embodiment, by inserting the first zoom group 111 on the object side into the image stabilization device 112, the overall length in the optical axis direction in the retracted state is shortened, but it is not limited to this. For example, the group on the image side may be inserted. Also, the lever member 505 and the movable member 503 may be provided on the linear guide cylinder 107 or the cam cylinder 108, and are not limited to a configuration that obtains power due to the rotation of the cam cylinder 108. The lever member 505 may be a member integrally formed with the holding member 502.

[0060] The lens device of this embodiment is applicable to a wide range of optical configurations without leaving marks on the image stabilization device while suppressing deterioration of the characteristics of the damping member in a lens device equipped with a lens retraction mechanism. Therefore, according to this embodiment, it is possible to provide a highly reliable lens device and imaging system applicable to various optical configurations.

[0061] The disclosure of this embodiment includes the following configurations. (Configuration 1) A holding member that holds an optical member movably between a first position on the optical axis of the imaging optical system and a second position retracted from the optical axis, A first member that holds the holding member movably in a direction orthogonal to the optical axis, A second member that holds the first member movably in the direction orthogonal to the optical axis, A third member adjacent to the second member, A first contact portion that contacts the holding member when the optical member moves from the first position to the second position, A lens device, comprising: a second contact portion that contacts the holding member in a state where the optical member is in the second position. (Configuration 2) The lens device according to Configuration 1, wherein the first contact portion is provided on a fourth member that moves the holding member when the lens device shifts to a retracted state. (Configuration 3) The lens device according to Configuration 1, wherein the first contact portion is provided on the second member or the third member. (Configuration 4) The lens device according to any one of Configurations 1 to 3, wherein the second contact portion is provided on the second member or the third member. (Configuration 5) The lens device according to any one of Configurations 1 to 4, wherein when the holding member contacts the second contact portion, the movable range of the first member is narrower in a state where the optical member is in the second position than in a state where the optical member is in the first position. (Configuration 6) The lens device according to Configuration 5, wherein the second member or the third member has a restricting portion that contacts the first member when shifting from a photographable state to a retracted state. (Configuration 7) The lens device according to Configuration 6, wherein the restricting portion contacts the first member by moving. (Configuration 8) The lens device according to any one of Configurations 1 to 7, further comprising a damping member provided between the first member and the second member. (Configuration 9) The lens device according to any one of Configurations 1 to 8, wherein the optical member is an image stabilization lens. (Configuration 10) An imaging system, comprising: the lens device according to any one of Configurations 1 to 9; and an imaging device. (Configuration 11) The imaging device has a first mount, The imaging system according to configuration 10, wherein the lens device has a second mount that can be connected to the first mount.

[0062] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist. Also, each of the above-described embodiments merely shows one embodiment of the present invention, and it is also possible to appropriately combine the embodiments.

Explanation of reference numerals

[0063] 101 Interchangeable lens (lens device) 107 Straight-ahead guide tube (third member) 501 Vibration correction lens (optical member) 502 Holding member 503 Movable member (first member) 504 Fixed member (second member) 506 Tip portion (first contact portion) 508 Regulation portion (second contact portion)

Claims

1. A holding member that holds an optical member so as to be movable between a first position on the optical axis of the imaging optical system and a second position retracted from the optical axis, A first member that holds the holding member so as to be movable in a direction orthogonal to the optical axis, A second member that holds the first member so as to be movable in the direction orthogonal to the optical axis, A third member adjacent to the second member, A first contact portion that contacts the holding member when the optical member moves from the first position to the second position, A second contact portion that contacts the holding member in a state where the optical member is in the second position, and a lens device characterized by having the same.

2. The lens device according to claim 1, wherein the first contact portion is provided on a fourth member that moves the holding member when the lens device shifts to a retracted state.

3. The lens device according to claim 1, wherein the first contact portion is provided on the second member or the third member.

4. The lens device according to claim 1, wherein the second contact portion is provided on the second member or the third member.

5. The lens device according to claim 1, wherein when the holding member contacts the second contact portion, the movable range of the first member is narrower in a state where the optical member is in the second position than in a state where the optical member is in the first position.

6. The lens device according to claim 5, wherein the second member or the third member has a restricting portion that contacts the first member when shifting from the photographable state to the retracted state.

7. The lens device according to claim 6, wherein the restricting portion contacts the first member by moving.

8. The lens device according to any one of claims 1 to 7, further comprising a damping member provided between the first member and the second member.

9. The lens device according to any one of claims 1 to 7, wherein the optical member is an image stabilization lens.

10. An imaging system comprising the lens device according to any one of claims 1 to 7 and an imaging device.

11. The imaging device has a first mount, The imaging system according to claim 10, wherein the lens device has a second mount connectable to the first mount.

Images