JP5593963B2 - Vibration correction apparatus and optical apparatus - Google Patents

Description

  The present invention relates to a shake correction apparatus and an optical apparatus including the shake correction apparatus.

  2. Description of the Related Art Conventionally, there is known a shake correction apparatus that corrects image shake by moving a shake correction optical system in a direction substantially orthogonal to the optical axis. This shake correction apparatus includes a lock mechanism that restricts movement of the movable member in a direction substantially orthogonal to the optical axis when shake correction is not performed. As a conventional example of such a locking mechanism, a biasing spring is provided on the lock ring, and the projecting portion of the movable member is pressurized in the optical axis direction by the biasing spring so as to prevent minute vibration of the movable member. A shake correction apparatus has been proposed (see Patent Document 1).

JP 2003-233097 A

  In the lock mechanism described above, the lock ring may be displaced from the lock position toward the lock release position due to vibration during transportation or the like. When the lock ring is displaced in the direction of the unlocking position, the pressure applied to the movable member by the biasing spring is weakened. For this reason, when a vibration such as a mirror shock occurs during the shutter release, the movable member vibrates in a direction substantially orthogonal to the optical axis. Therefore, it is required to securely hold the movable member in the locked state.

  An object of the present invention is to provide a shake correction apparatus and an optical apparatus that can reliably hold a movable member provided with a shake correction optical system.

According to the first aspect of the present invention, there is provided a shake correction optical system that corrects a shake of an image by moving in a cross plane direction parallel to a plane that intersects the optical axis, and the shake correction optical system. A movable member that moves in the direction of the intersecting surface together with a system, the first engaging portion protruding in the direction of the intersecting surface, and a stepped portion formed on one surface of the first engaging portion; The first engagement of the movable member is supported by the lock position that restricts the movement of the movable member in the direction of the intersecting surface and the unlock position that allows the movement of the movable member in the direction of the intersecting surface. And a lock member having a biasing member capable of abutting against the stepped portion of the movable member. The step portion and the biasing member slide on the one surface. When the carrier portion is continuously formed and the lock member is driven to the lock position, the first engagement portion of the movable member and the second engagement portion of the lock member are engaged. When the force that moves the movable member in the direction of the intersecting surface is restricted and the lock member is moved to the unlocking position during the restriction, the urging member of the lock member is moved to the movable member. When the locking member is driven to the unlocking position, the movement of the locking member to the unlocking position is regulated by sliding the flat part of the movable member against the stepped part of the movable member. The engagement between the first engagement portion of the movable member and the second engagement portion of the lock member is released, the movement of the movable member in the direction of the intersecting surface is allowed, and the lock member The biasing member of the movable By the flat portion of the timber from sliding overcome the stepped portion of the movable member, allowing movement to the unlocked position of the locking member, and wherein.
The invention according to claim 2 is the shake correction device according to claim 1, wherein the lock member has a substantially annular shape when viewed from the optical axis direction, and the annular outer peripheral surface of the lock member. In addition, a rack gear is formed.
A third aspect of the present invention is the shake correction apparatus according to the first or second aspect, wherein the urging members are provided as a pair of members, and each of the urging members is a light beam when viewed from the optical axis direction. It is provided in the position which opposes on both sides of an axis | shaft.
A fourth aspect of the present invention is the shake correction device according to any one of the first to third aspects, wherein the flatness in the protruding direction in which the first engaging portion protrudes is seen from the optical axis direction. The length of the part is larger than the length of the urging member in the protruding direction.
A fifth aspect of the present invention is the shake correction device according to any one of the first to fourth aspects, wherein the urging member is provided as a pair of members, and is viewed from the optical axis direction. A distance between the urging member and a driving member that drives the lock member is substantially equal.
A sixth aspect of the present invention is the shake correction apparatus according to any one of the first to fifth aspects, wherein the movable member is restricted from rotating around the optical axis.
The invention according to claim 7 is the shake correction device according to any one of claims 1 to 6, wherein the biasing member is engaged with the stepped portion of the movable member. It is characterized by comprising a bent portion that engages in parallel with the extending direction of the stepped portion.
The invention according to claim 8 is the shake correction device according to any one of claims 1 to 7, wherein the stepped portion is configured such that the lock member is disposed on one surface of the first engaging portion. It is formed in the edge part of the direction which moves to the said lock release position, It is characterized by the above-mentioned.
A ninth aspect of the present invention is the shake correction device according to any one of the first to eighth aspects, wherein the step portion engages with the urging member and a tangent line of the portion engaging the biasing member. Θ2> θ1 when θ1 is an angle formed by a perpendicular line perpendicular to one surface of the joint and θ2 is an angle formed by a tangent line of the portion where the biasing member is engaged with the stepped portion and the perpendicular line It is characterized by becoming.
A tenth aspect of the present invention is an optical apparatus including the optical system and the shake correction device according to any one of the first to ninth aspects.

  ADVANTAGE OF THE INVENTION According to this invention, the shake correction apparatus and optical apparatus which can hold | maintain the movable member provided with the shake correction optical system reliably can be provided.

It is sectional drawing which shows schematic structure of the camera system 1 of embodiment. It is a front view when the movable frame 20 is made into the lock release state. It is a front view when the movable frame 20 is made into a locked state. It is a partial side view in the arrow A of FIG. It is a conceptual diagram which shows the shape and positional relationship of the 1st engaging part 21b and the urging | biasing spring 34. FIG. It is a partial side view in the arrow B of FIG. FIG. 5 is a partial side view showing an engagement state between a first engagement portion 21b and a biasing spring 34. FIG. 5 is a partial side view showing an engagement state between a first engagement portion 21b and a biasing spring 34. It is a partial side view which shows the other structural example (1st level | step-difference part 22A, 2nd level | step-difference part 22B) of the level | step-difference part 22. FIG. It is a fragmentary side view which shows the other structural example (35A of bending parts) of the bending part.

  Embodiments of a shake correction apparatus according to the present invention and an optical apparatus having the same will be described below with reference to the drawings. In the present embodiment, a lens barrel attached to a digital camera will be described as an example of an optical apparatus provided with the shake correction apparatus according to the present invention.

  In FIG. 1 shown below, an XYZ orthogonal coordinate system is provided as appropriate for ease of explanation and understanding. In this coordinate system, the direction toward the left as viewed from the photographer at the camera position (hereinafter referred to as the normal position) when the photographer shoots a horizontally long image with the optical axis A horizontal is defined as the X plus direction. Further, the direction toward the upper side in the normal position is defined as the Y plus direction. Further, the direction toward the subject at the normal position is taken as the Z direction.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a camera system 1 of the present embodiment. The camera system 1 of the present embodiment is a lens interchangeable digital single-lens reflex camera. The camera system 1 includes a camera body 2 and a lens barrel 3. The lens barrel 3 is attached to the camera body 2 via the mount 4. The mount unit 4 includes a camera-side mount (not shown) provided on the camera body 2 and a lens-side mount (not shown) provided on the lens barrel 3. The mount unit 4 is an electrode (not shown) for transmitting and receiving data between the camera body 2 and the lens barrel 3 and an electrode (not shown) for transmitting power from the camera body 2 to the lens barrel 3. Is provided.

  The lens barrel 3 includes a lens optical system L, a focus motor 5, a shake correction device 6, and a diaphragm unit 7.

  The lens optical system L includes a plurality of lens groups L1 to L3. Light from a subject (not shown) passes through the lens groups L1 to L3 and the aperture unit 7 and enters the camera body 2 as subject light. In FIG. 1, the configuration of the lens optical system L is schematically shown.

  Among the lens optical systems L, the lens unit L2 is a focus adjustment optical system that is moved along the optical axis OA by the focus motor 5. The lens group L3 is a shake correction optical system that moves in a direction substantially orthogonal to the optical axis OA by the shake correction device 6, that is, a cross plane direction parallel to a plane crossing the optical axis OA. The shake correction device 6 will be described later. The operations of the focus motor 5 and the shake correction device 6 are controlled by a lens CPU (not shown) provided inside the lens barrel 3. The lens CPU transmits and receives data to and from a camera CPU (not shown) provided in the camera body 2. The lens CPU controls the operations of the focus motor 5 and the shake correction device 6 in accordance with instructions from the camera CPU.

  The aperture unit 7 includes a plurality of aperture blades (not shown). The aperture unit 7 adjusts the amount of subject light by driving the aperture blades in the direction of the optical axis OA to change the area of the aperture through which the subject light passes.

  On the other hand, the camera body 2 includes a main mirror 8, a sub mirror 9, a distance measuring unit 10, a shutter unit 11, an optical filter 12, an image sensor 13, a liquid crystal monitor 14, a pentaprism 15, and an eyepiece optical system. 16.

  As shown in FIG. 1, the main mirror 8 is positioned on the optical axis OA before the imaging (position A). In this case, the subject light incident on the camera body 2 from the lens barrel 3 is guided upward by the main mirror 8 and is formed as a subject image on a diffusion screen (not shown). A half mirror is formed on a part of the main mirror 8. For this reason, part of the subject light is reflected downward by the sub mirror 9 in the main mirror 8 and forms an image on the distance measuring unit 10. The subject light imaged on the diffusion screen is incident on the pentaprism 15. The pentaprism 15 guides incident subject light to the eyepiece optical system 16. The photographer can observe the subject image before photographing by viewing the eyepiece optical system 16.

  The pentaprism 15 guides part of the incident subject light to a photometric unit (not shown). The photometry unit detects luminance information of the subject light. A photometric control calculation unit (not shown) calculates subject luminance based on luminance information detected by the photometric unit. Further, the photometric control calculation unit performs calculation using the set imaging sensitivity, lens information, calculated subject brightness, and the like, and determines an exposure value (aperture value, shutter speed).

  On the other hand, the main mirror 8 rotates upward at the time of imaging, and retracts out of the optical axis OA as indicated by a broken line in FIG. 1 (position B). The subject light incident on the camera body 2 from the lens barrel 3 is guided to the imaging element 13 for photographing through the shutter unit 11 and the optical filter 12. The optical filter 12 is a member that removes unnecessary spatial frequency components on the imaging surface of the imaging element 13. The image sensor 13 accumulates the captured subject light as a signal charge and converts it into image information. The image information is subjected to image processing such as image correction and interpolation processing by an image control unit (not shown), and then stored in a memory (not shown).

  The liquid crystal monitor 14 displays captured still images and moving images. The liquid crystal monitor 14 displays information regarding shooting conditions and camera operations, various messages, and the like.

  Next, the configuration of the shake correction apparatus 6 in the present embodiment will be described. 2 and 3 are front views of the shake correction device 6 when viewed from the optical axis (OA) direction. 2 is a front view when the movable frame 20 is in the unlocked state, and FIG. 3 is a front view when the movable frame 20 is in the locked state. FIG. 4 is a partial side view taken along arrow A in FIG. FIG. 5 is a conceptual diagram showing the shape and positional relationship of the first engagement portion 21b and the urging spring 34. As shown in FIG. 6 is a partial side view in the direction of arrow B in FIG. 7 and 8 are partial side views showing an engaged state between the first engaging portion 21b and the urging spring 34. FIG. Among these, FIG. 8 shows an engaged state when the angle θ1 at the stepped portion 22 of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the biasing spring 34 are θ2 = θ1.

  As shown in FIGS. 2 and 3, the shake correction device 6 includes a movable frame 20 as a movable member, a lock ring 30 as a lock member, and a fixed frame 40. Further, the shake correction device 6 includes a pair of voice coil motors 50 (50X, 50Y), a pair of position detection devices 60 (60X, 60Y), and a lock mechanism drive unit 70. The voice coil motor is hereinafter abbreviated as “VCM”.

  First, the movable frame 20 will be described. The movable frame 20 is a substantially cylindrical lens holding frame that holds a lens group L3 that is a shake correction optical system. The movable frame 20 includes a plurality of first engaging portions 21 (21a, 21b) on the outer peripheral portion. The first engagement portion 21 is a substantially semicircular protrusion that engages with a second engagement portion 32 (described later) of the lock ring 30. The first engaging portions 21 are arranged at equal intervals in the radial direction around the optical axis OA. The first engaging portion 21 is composed of first engaging portions 21a and 21b.

  The first engagement portion 21 a engages only with a second engagement portion (described later) of the lock ring 30. The first engaging portions 21a are provided at six locations. As for the 1st engaging part 21a, the flat part (not shown) is formed in both surfaces.

  On the other hand, the first engagement portion 21 b engages with the second engagement portion of the lock ring 30 and also engages with a biasing spring 34 (described later) provided on the lock ring 30. The first engaging portion 21b is provided at two places. The first engaging portion 21b is disposed at a position 180 degrees away with the optical axis OA interposed therebetween. Further, as shown in FIG. 4, the first engagement portion 21 b has a step portion 22 and a flat portion 23 on a surface facing the biasing spring 34 (hereinafter referred to as “rear surface” as appropriate). Is formed.

  As shown in FIG. 4, the stepped portion 22 of the first engaging portion 21 b is a portion having a substantially semicircular cross section that protrudes from the back surface of the first engaging portion 21 b toward the lock ring 30. Further, as shown in FIG. 5, the stepped portion 22 is formed at the end of the unlocking direction (arrow R direction) in which the lock ring 30 is driven on the back surface of the first engaging portion 21 b. Further, as shown in FIG. 5, the stepped portion 22 extends from the base portion between the first engaging portion 21 b and the movable frame 20 to the outer end portion.

  According to the above configuration, in FIG. 4, when the lock ring 30 is driven in the locking direction (arrow L direction), the flat portion 23 is in a state where the bent portion 35 of the biasing spring 34 has completely passed over the stepped portion 22. (See FIG. 6). That is, when the stepped portion 22 of the first engaging portion 21b is formed at the position shown in FIG. 4, there is a dimensional error between the bent portion 35 of the biasing spring 34 and the stepped portion 22 of the first engaging portion 21b. Even if it occurs, the bent portion 35 of the urging spring 34 contacts the flat portion 23 in a state where the stepped portion 22 is completely overcome. Therefore, the lock ring 30 can be locked more reliably.

  Next, the lock ring 30 will be described. The lock ring 30 is a member for bringing the movable frame 20 into a locked state or an unlocked state. The lock ring 30 is rotatably supported by the fixed frame 40. As shown in FIGS. 2 and 3, the lock ring 30 includes a lock arm 31, a second engagement portion 32, a rack gear 33, and a biasing spring 34 as a biasing member.

  The lock arm 31 is a member formed integrally with the lock ring 30. The lock arm 31 rotates together with the lock ring 30 clockwise or counterclockwise about the optical axis OA. As shown in FIG. 2, the lock arm 31 contacts a rotation restricting portion 42 (described later) provided on the fixed frame 40 when the lock ring 30 is driven to the unlocked position (unlocked state). As shown in FIG. 3, the lock arm 31 comes into contact with a rotation restricting portion 43 (described later) provided on the fixed frame 40 when the lock ring 30 is driven to the lock position (locked state). As described above, the lock ring 30 is limited in its driving (moving) range by the lock arm 31 coming into contact with the rotation restricting portions 42 and 43.

  The second engaging portion 32 is a substantially arc-shaped protrusion provided on the inner peripheral side of the lock ring 30. Eight second engaging portions 32 are provided at equal intervals on the inner peripheral side of the lock ring 30. As shown in FIG. 2, the second engagement portion 32 is separated from the first engagement portion 21 provided in the movable frame 20 when the lock ring 30 is driven to the unlock position. As shown in FIG. 3, the second engagement portion 32 engages with the first engagement portion 21 provided on the movable frame 20 when the lock ring 30 is driven to the lock position. Note that “engagement” between the first engagement portion 21 and the second engagement portion 32 means that the movable range of the movable frame 20 is limited to a range narrower than the control range for shake correction in the locked state. .

  The rack gear 33 is a gear that engages with a pinion gear 72 (described later) of the lock mechanism drive unit 70. The rack gear 33 is fixed to the lock ring 30.

  The urging spring 34 is a plate-like member that can come into contact with the first engagement portion 21 b of the movable frame 20. As shown in FIG. 2, the urging spring 34 is provided at a position substantially opposite to the first engagement portion 21 b of the movable frame 20. Further, as shown in FIG. 4, the urging spring 34 has a substantially hemi-shaped bent portion 35 on the distal end side. When the lock ring 30 is driven to the locked position, the bent portion 35 comes into contact with the first engaging portion 21b of the movable frame 20 and pressurizes the movable frame 20 in the direction along the optical axis OA. By this pressurization, a frictional force is generated between the first engaging portion 21 b of the movable frame 20 and the bent portion 35. For this reason, the vibration of the movable frame 20 due to the vibration such as the mirror shock at the shutter release can be suppressed.

  Further, as shown in FIG. 5, the bent portion 35 of the urging spring 34 is formed in the direction in which the step portion 22 is formed when engaged with the step portion 22 provided in the first engagement portion 21 b of the movable frame 20. Engage in parallel. That is, the bent portion 35 of the urging spring 34 is formed such that the ridge line A of the portion that engages with the stepped portion 22 of the first engaging portion 21b is parallel to the line B that indicates the direction in which the stepped portion 22 is formed. ing.

  Thus, in this embodiment, when the bent portion 35 of the biasing spring 34 is engaged with the step portion 22 provided in the first engagement portion 21b of the movable frame 20, the direction in which the step portion 22 is formed is determined. Engage in parallel. For this reason, the amount of spring force of the biasing spring 34 (spring restoring force) can be stabilized. That is, when the bent portion 35 of the urging spring 34 is engaged with the step portion 22, the amount of spring force of the urging spring 34 can be made substantially constant. Therefore, the spring strength of the biasing spring 34 can be set appropriately. According to this, switching between the locked state and the unlocked state can be performed more reliably and stably.

  On the other hand, when the bent portion 35 of the urging spring 34 is not engaged in parallel with the direction in which the step portion 22 is formed, the amount of spring force of the urging spring 34 becomes unstable. That is, the amount of spring force of the urging spring 34 varies depending on the position where the urging spring 34 is engaged. For this reason, it is difficult to appropriately set the spring strength of the biasing spring 34. Therefore, it becomes difficult to reliably and stably switch between the locked state and the unlocked state.

  Next, the angle θ1 at the step portion 22 of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the biasing spring 34 will be described. As shown in FIG. 4, in the stepped portion 22 of the first engaging portion 21 b, the perpendicular line “a” orthogonal to the back surface of the first engaging portion 21 b and the tangent of the inclined surface where the stepped portion 22 engages with the biasing spring 34. The angle formed with b is θ1. Further, in the bent portion 35 of the biasing spring 34, the perpendicular line a perpendicular to the back surface of the first engaging portion 21b and the bent portion 35 of the biasing spring 34 engage with the stepped portion 22 of the first engaging portion 21b. The angle formed by the tangent line c of the part is defined as θ2. In the present embodiment, the angle θ1 at the stepped portion 22 of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the biasing spring 34 are set to satisfy θ2> θ1. With such a setting, as described later, when the movable frame 20 is switched from the locked state to the unlocked state, the bent portion 35 of the biasing spring 34 causes the stepped portion 22 of the first engaging portion 21b to move. You can easily get over.

  On the other hand, as shown in FIG. 8, when the angle θ1 at the stepped portion 22 of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the biasing spring 34 do not satisfy θ2> θ1, the movable frame 20 When switching from the locked state to the unlocked state, it becomes difficult for the bent portion 35 of the urging spring 34 to get over the stepped portion 22 of the first engaging portion 21b. FIG. 8 shows an example where θ2 = θ1. If the lock ring 30 is further driven in the unlocking direction (arrow R direction) from the state shown in FIG. 8, the bent portion 35 of the urging spring 34 may be pressed against the step portion 22 and buckled and deformed. It is done. In this case, the movable frame 20 cannot be smoothly switched from the locked state to the unlocked state. Even if the urging spring 34 is replaced, the buckling deformation of the urging spring 34 is caused every time the movable frame 20 is switched from the locked state to the unlocked state.

  Therefore, as in the present embodiment, by setting the angle θ1 at the stepped portion 22 of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the biasing spring 34 to satisfy θ2> θ1, The movable frame 20 can be smoothly switched from the locked state to the unlocked state. Further, since the bent portion 35 of the urging spring 34 is not pressed against the stepped portion 22 and buckled and deformed, the life of the urging spring 34 can be extended. For this reason, the reliability of the shake correction apparatus 6 can be improved.

  Next, the fixed frame 40 will be described. As shown in FIGS. 2 and 3, the fixed frame 40 is a substantially disk-shaped member having an opening 41 at the center. The movable frame 20 is inserted into the opening 41 of the fixed frame 40. Further, the lock ring 30 is rotatably supported by the fixed frame 40. On the outer peripheral portion of the fixed frame 40, rotation restricting portions 42 and 43 are provided. As described above, the rotation restricting portions 42 and 43 are portions that limit the rotation range of the lock arm 31 of the lock ring 30.

  2 and 3, the fixed frame 40 includes a VCM 50 (50X, 50Y) for moving the movable frame 20, a pair of position detection devices 60 (60X, 60Y), and a lock mechanism drive unit 70. It is attached. The movable frame 20 is connected to the VCM 50 (50X, 50Y). The VCM 50 (50X, 50Y) is an actuator for moving the movable frame 20 in a direction substantially orthogonal to the optical axis OA. The movable frame 20 is movable in a direction substantially orthogonal to the optical axis OA, but the rotation around the optical axis OA is restricted. The position detection device 60 (60X, 60Y) is a device that detects the position of the movable frame 20 in the XY direction as position information.

  In the above configuration, the camera CPU (not shown) that controls the camera system 1 in an integrated manner is detected by the image blur information of the subject image detected by the acceleration sensor (not shown) and the position detection device 60 (60X, 60Y). Based on the obtained position information, a target position for moving the movable frame 20 is calculated. The camera CPU drives the VCM 50 (50X, 50Y) based on the calculated target position, and moves the movable frame 20 in a direction substantially orthogonal to the optical axis OA. As a result, the lens group L3 held by the movable frame 20 moves in a direction that cancels out the shake of the subject image, so that the shake is corrected. The driving of the VCM 50 (50X, 50Y) described above is controlled via a lens CPU (not shown).

  The lock mechanism drive unit 70 includes a drive motor 71 and a pinion gear 72. The drive motor 71 is an actuator driven by the lens CPU described above. The drive motor 71 is fixed to the fixed frame 40 with screws (reference numerals omitted). The pinion gear 72 is attached to the rotation shaft 71 a of the drive motor 71. The pinion gear 72 is engaged with the rack gear 33 fixed to the lock ring 30. The rotation direction of the drive motor 71 is controlled by a drive signal supplied from the lens CPU.

  Next, in the shake correction device 6 of the present embodiment, the operation of each part when the movable frame 20 is set to the locked state and the unlocked state will be described.

  First, the case where the movable frame 20 is switched from the unlocked state (FIG. 2) to the locked state (FIG. 3) will be described. When the movable frame 20 is in the unlocked state, as shown in FIG. 2, the first engaging portion 21 (21 a, 21 b) provided on the movable frame 20 and the second engaging portion provided on the lock ring 30. 32 is not engaged. Further, when the movable frame 20 is in the unlocked state, as shown in FIG. 4, the first engaging portion 21 b of the movable frame 20 and the biasing spring 34 are not engaged. For this reason, the shake correction apparatus 6 can perform shake correction control by moving the movable frame 20 in a direction substantially orthogonal to the optical axis OA.

  When the camera CPU receives an instruction from the camera body 2 in the unlocked state to input the movable frame 20 in the locked state, the camera CPU controls the lens CPU so that the rotation shaft 71a of the drive motor 71 is viewed in plan view in FIG. Rotate counterclockwise. When the rotating shaft 71a of the drive motor 71 rotates counterclockwise, the rack gear 33 to be engaged rotates clockwise. Thereby, the lock ring 30 is driven clockwise (lock direction) around the optical axis OA in the plan view of FIG. Then, the lock ring 30 stops at the lock position shown in FIG. At this time, the lock arm 31 of the lock ring 30 contacts the rotation restricting portion 43.

  In this way, the first engagement portion 21 (21a, 21b) provided on the movable frame 20 and the second engagement provided on the lock ring 30 are driven to the lock position shown in FIG. Part 32 is engaged. Thereby, the movable frame 20 is restricted from moving in a direction substantially orthogonal to the optical axis OA. For this reason, when shake correction is not performed, unnecessary movement of the lens group L3 (shake correction optical system) held by the movable frame 20 can be suppressed.

  Even when the movable frame 20 is in the locked state, there is a slight gap between the first engagement portion 21 (21a, 21b) of the movable frame 20 and the second engagement portion 32 of the lock ring 30. . This gap is provided to allow a dimensional tolerance between the movable frame 20 and the lock ring 30. Further, this gap is provided in order to allow the lock ring 30 to rotate with the normal torque of the drive motor 71.

  On the other hand, if there is a gap as described above between the first engagement portion 21 (21a, 21b) of the movable frame 20 and the second engagement portion 32 of the lock ring 30, the movable frame 20 is in the locked state. However, the movable frame 20 may vibrate due to vibration such as a mirror shock at the time of shutter release.

  Therefore, when the movable frame 20 is in the locked state, as shown in FIG. 6, the bent portion 35 of the urging spring 34 gets over the stepped portion 22 of the first engaging portion 21b and the first engaging portion 21b is flat. Move to section 23. The bent portion 35 of the urging spring 34 comes into contact with the flat portion 23 of the first engaging portion 21b. In this state, the bent portion 35 of the biasing spring 34 presses the first engaging portion 21b of the movable frame 20 in the direction along the optical axis OA. By this pressurization, a frictional force is generated between the first engaging portion 21 b of the movable frame 20 and the bent portion 35 of the urging spring 34. For this reason, the vibration of the movable frame 20 due to the vibration such as the mirror shock at the shutter release can be suppressed.

  By the way, even if the frictional force as described above acts between the bent portion 35 of the urging spring 34 and the movable frame 20, the lock ring 30 is displaced from the lock position in the unlocking direction due to vibration during transportation or the like. May end up. In order to prevent such a shift of the lock ring 30, it is conceivable to increase the urging force of the urging spring 34. However, if the urging force of the urging spring 34 is increased, it is necessary to drive the lock ring 30 with a torque exceeding the large urging force of the urging spring 34 when the movable frame 20 is switched from the locked state to the unlocked state. . For this reason, a large drive motor 71 is required, and an increase in the size of the lens barrel 3 is inevitable.

  The lock ring 30 can also be kept in the locked position by continuously applying a driving force for rotating the lock ring 30 in the lock direction by the drive motor 71. However, in that case, it is necessary to always energize the drive motor 71. For this reason, the power consumption of the camera system 1 increases. The lens barrel 3 is supplied with power from the camera body 2. For this reason, when the power source of the camera body 2 is turned off, the drive motor 71 cannot be energized. Therefore, it is difficult to keep the lock ring 30 in the locked position by energizing the drive motor 71.

  On the other hand, in the shake correction device 6 of the present embodiment, even if the lock ring 30 tries to rotate in the unlocking direction due to vibration during transportation or the like, as shown in FIG. Since the stepped portion 22 of the first engagement portion 21b comes into contact, the rotation of the lock ring 30 in the unlocking direction (arrow R direction) is restricted. For this reason, the lock ring 30 does not further rotate in the unlocking direction from the position of FIG. Therefore, it is possible to prevent the lock ring 30 from shifting from the lock position in the unlocking direction due to vibration during transportation or the like.

  As described above, in the shake correction device 6 of the present embodiment, the lock ring 30 is not displaced in the unlocking direction, so that the pressure applied to the movable frame 20 by the biasing spring 34 is maintained. Therefore, when the movable frame 20 is in the locked state, the movable frame 20 does not vibrate due to vibration such as mirror shock during shutter release even if vibration is applied during transportation. For this reason, deterioration of image quality can be prevented.

  In addition, in the vibration given at the time of transportation etc., the inertia force which the lock ring 30 gets over the level | step-difference part 22 and moves to a lock release direction does not arise. For this reason, the lock ring 30 can be kept in the locked position without continuously energizing the drive motor 71.

  Next, the case where the movable frame 20 is switched from the locked state (FIG. 3) to the unlocked state (FIG. 2) will be described.

  When the camera CPU receives an instruction from the camera body 2 to set the movable frame 20 in the unlocked state in the locked state, the camera CPU controls the lens CPU so that the rotation shaft 71a of the drive motor 71 is viewed in plan view in FIG. Rotate clockwise. When the rotation shaft 71a of the drive motor 71 rotates clockwise, the rack gear 33 to be engaged rotates counterclockwise. As a result, the lock ring 30 is driven counterclockwise (unlock direction) about the optical axis OA. Then, the lock ring 30 stops at the unlock position shown in FIG. At this time, the lock arm 31 of the lock ring 30 contacts the rotation restricting portion 42.

  As described above, when the lock ring 30 is driven to the unlock position shown in FIG. 2, the first engagement portion 21 (21 a, 21 b) provided in the movable frame 20 and the second engagement portion provided in the lock ring 30. The engagement with the engagement portion 32 is released. Thereby, the movable frame 20 can be moved in a direction substantially orthogonal to the optical axis OA. Further, the contact between the first engagement portion 21 b provided on the movable frame 20 and the biasing spring 34 provided on the lock ring 30 is released. As a result, the first engaging portion 21b provided in the movable frame 20 is not pressurized in the direction along the optical axis OA by the biasing spring 34. Therefore, the lens CPU can move the movable frame 20 in a direction substantially orthogonal to the optical axis OA as a function of the shake correction device 6.

  Further, when the lock ring 30 is rotated in the unlocking direction, that is, counterclockwise about the optical axis OA by the driving force of the drive motor 71, the bent portion 35 of the urging spring 34 is moved from the position shown in FIG. After sliding on the flat part 23 of the engaging part 21b, as shown in FIG. 7, it contacts the step part 22 of the first engaging part 21b. Further, the bent portion 35 of the urging spring 34 moves over the stepped portion 22 of the contacted first engaging portion 21b and moves in the unlocking direction.

  As described above, the angle θ1 at the stepped portion 22 of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the biasing spring 34 are set to satisfy θ2> θ1. For this reason, when the movable frame 20 is switched from the locked state to the unlocked state, the bent portion 35 of the biasing spring 34 easily climbs over the stepped portion 22 of the first engaging portion 21b without being buckled. be able to. And the bending part 35 of the urging | biasing spring 34 can move to the position which does not engage with the level | step-difference part 22 of the 1st engaging part 21b, as shown in FIG.2 and FIG.4.

According to embodiment mentioned above, there exist the following effects.
(1) When the movable frame 20 is in the locked state, the bent portion 35 of the biasing spring 34 and the stepped portion 22 of the first engaging portion 21b come into contact with each other, whereby the lock ring 30 rotates in the unlocking direction. Is regulated. Therefore, it is possible to prevent the lock ring 30 from being shifted from the lock position in the unlocking direction due to vibration during transportation or the like. As described above, since the lock ring 30 does not shift in the unlocking direction, the pressure applied to the movable frame 20 by the biasing spring 34 is maintained. Therefore, even if a vibration such as a mirror shock occurs during the shutter release, the movable frame 20 does not vibrate. Therefore, according to the shake correction apparatus 6 of the present embodiment, it is possible to reliably hold the movable frame 20 including the lens group L3 of the shake correction optical system.

(2) Since it is not necessary to increase the urging force of the urging spring 34 in order to prevent the lock ring 30 from shifting, torque exceeding the large urging force of the urging spring 34 is not required in the drive motor 71. For this reason, the movable frame 20 can be reliably held without increasing the size of the drive motor 71. Further, since the large drive motor 71 is not necessary, it is possible to avoid an increase in size and weight of the lens barrel 3.

(3) The biasing spring 34 pressurizes the movable frame 20 in the direction along the optical axis OA when the lock ring 30 is driven to the lock position, and the lock ring 30 is locked by vibration during transportation. Can be prevented from moving in the unlocking direction. According to this, since it is not necessary to provide a dedicated member for preventing the lock ring 30 from moving from the lock position in the unlocking direction, it is possible to suppress an increase in cost.

(4) The driving motor 71 does not need to continue to apply a driving force for rotating the lock ring 30 in the locking direction. For this reason, an increase in power consumption in the camera system 1 can be suppressed. Further, the movable frame 20 can be mechanically locked. For this reason, even when the power source of the camera body 2 is turned off, the locked state of the movable frame 20 can be maintained.

(5) When the lock ring 30 is driven to the unlocking direction by the driving force of the drive motor 71, the bent portion 35 of the urging spring 34 slides on the flat portion 23 of the first engaging portion 21b, It moves over the stepped portion 22 of the first engaging portion 21b and moves in the unlocking direction. In the vibration given at the time of transportation or the like, an inertia force enough to move the bent portion 35 over the stepped portion 22 and move in the unlocking direction does not occur. For this reason, the locked state of the movable frame 20 can be reliably held during transportation or the like.

(6) When the bent portion 35 of the urging spring 34 is engaged with the stepped portion 22 provided in the first engaging portion 21 b of the movable frame 20, the bent portion 35 is engaged in parallel with the forming direction of the stepped portion 22. For this reason, the amount of spring force of the biasing spring 34 can be stabilized. That is, when the bent portion 35 of the urging spring 34 is engaged with the step portion 22, the amount of spring force of the urging spring 34 can be made substantially constant. Therefore, the spring strength of the biasing spring 34 can be set appropriately. According to this, switching between the locked state and the unlocked state can be performed more reliably and stably.

(7) The step portion 22 of the first engagement portion 21b is formed at the end of the back surface of the first engagement portion 21b in the direction in which the lock ring 30 is driven to the unlock position. According to this, even if a dimensional error has occurred in the bent portion 35 of the biasing spring 34 and the stepped portion 22 of the first engaging portion 21b, the bent portion 35 of the biasing spring 34 has completely passed over the stepped portion 22. It can be brought into contact with the flat portion 23 in a state. Therefore, the lock ring 30 can be moved to the lock position more reliably.

(8) An angle formed between the perpendicular line a perpendicular to the back surface of the first engagement portion 21b and the tangent line b of the inclined surface where the step portion 22 engages with the biasing spring 34 is θ1, and the first engagement portion 21b Θ2> θ1 when θ2 is an angle formed between the perpendicular line a perpendicular to the back surface and the tangent line c of the portion where the bent portion 35 of the biasing spring 34 engages the stepped portion 22 of the first engaging portion 21b. It is set to be. For this reason, when the movable frame 20 is switched from the locked state to the unlocked state, the bent portion 35 of the biasing spring 34 can easily get over the stepped portion 22 of the first engaging portion 21b. Therefore, the movable frame 20 can be smoothly switched from the locked state to the unlocked state. Further, since the bent portion 35 of the urging spring 34 is not pressed against the stepped portion 22 and buckled and deformed, the life of the urging spring 34 can be extended. For this reason, the reliability of the shake correction apparatus 6 can be improved.
(Deformation)

Without being limited to the embodiment described above, the present invention can be variously modified and changed as described below, and these are also within the scope of the present invention.
(1) In this embodiment, the example which used the level | step-difference part 22 as the substantially semicircle-shaped protrusion was demonstrated. However, the present invention is not limited to this example, and a shape having two step portions 22 may be used. FIG. 9 is a partial side view showing another configuration example of the step portion 22 (first step portion 22A, second step portion 22B). As shown in FIG. 9, two first step portions 22A and a second step portion 22B, and a flat portion 23 are formed on the back surface of the first engagement portion 21b. 22 A of 1st level | step-difference parts and 22B of 2nd level | step differences are the site | parts which inclined toward the surface side from the back surface of the 1st engaging part 21b. That is, 22 A of 1st level | step-difference parts and 22B of 2nd level | step differences form the groove part used as reverse concave shape. The flat part 23 is located at the bottom of the groove part.

  As shown in FIG. 9, in the first step portion 22A, the perpendicular line a perpendicular to the back surface of the first engagement portion 21b and the tangent line b of the inclined surface where the first step portion 22A engages the biasing spring 34 are obtained. Is defined as θ1. Further, in the bent portion 35 of the biasing spring 34, the perpendicular line a perpendicular to the back surface of the first engaging portion 21b and the bent portion 35 of the biasing spring 34 are in contact with the first step portion 22A of the first engaging portion 21b. The angle formed by the tangent line c of the contacting part is defined as θ2.

  In the configuration shown in FIG. 9, the angle θ1 at the first step portion 22A of the first engaging portion 21b and the angle θ2 at the bent portion 35 of the urging spring 34 are set to satisfy θ2> θ1. With this configuration, when the movable frame 20 is switched from the locked state to the unlocked state, the bent portion 35 of the urging spring 34 easily gets over the first step portion 22A of the first engaging portion 21b. be able to.

  Further, according to the configuration shown in FIG. 9, when the lock ring 30 is driven in the direction of the arrow L, which is the direction of the lock position, the bent portion 35 of the biasing spring 34 engages with the second step portion 22B. For this reason, the rotation of the lock ring 30 in the arrow L direction (clockwise in a plan view of FIG. 2) is restricted. Therefore, the rotation restricting portion 43 provided on the fixed frame 40 can be omitted.

(2) In this embodiment, the example which made the bending part 35 of the urging | biasing spring 34 the substantially square shape was demonstrated. However, the present invention is not limited to this example, and the bent portion 35 of the biasing spring 34 may have another shape. FIG. 10 is a partial side view showing another configuration example (bending portion 35 </ b> A) of the bending portion 35. The bent portion 35A in this configuration example has a substantially hemispherical cross section. The configuration of the stepped portion 22 of the first engaging portion 21b is the same as that of the present embodiment.

  In the present embodiment, as shown in FIG. 5, the ridge line A of the portion that engages the stepped portion 22 of the first engaging portion 21 b in the bent portion 35 of the biasing spring 34 indicates the direction in which the stepped portion 22 is formed. It was formed so as to be parallel to the line B. However, in this configuration example, the bent portion 35 </ b> A of the urging spring 34 need not be parallel to the formation direction of the stepped portion 22. According to this configuration example, the contact area between the bent portion 35 </ b> A of the biasing spring 34 and the stepped portion 22 is reduced. For this reason, the movement of the biasing spring 34 becomes smoother.

  Further, the frictional force acting between the bent portion 35A of the urging spring 34 and the first engaging portion 21b of the movable frame 20 hardly changes. For this reason, when the movable frame 20 is set to the locked state, it is possible to suppress the deviation due to vibration. Further, even when the lock ring 30 is deviated from the locked state due to vibration during transportation or the like, the bent portion 35A of the biasing spring 34 and the stepped portion 22 of the first engagement portion 21b come into contact with each other. The counterclockwise rotation of 34 can be restricted. According to this, the lock ring 30 interlocked with the biasing spring 34 does not further rotate in the unlocking direction (in the direction of arrow R in the figure) from the position of FIG. Thus, even when the bent portion 35A of the urging spring 34 is hemispherical, the same effect as in the above embodiment can be obtained.

(3) In this embodiment, the urging springs 34 are arranged at two locations. However, not limited to this example, three or more biasing springs 34 may be arranged. Further, the biasing spring 34 in the present embodiment biases the first engaging portion 21b of the movable frame 20 by elastically deforming the metal. However, the present invention is not limited to this example, and the bent portion 35 may be urged by the restoring force of the spring.

(4) In this embodiment, an example in which the shake correction apparatus according to the present invention is applied to a digital camera has been described. However, the present invention is not limited to this, and the shake correction apparatus according to the present invention can also be applied to a film-type silver salt camera, a video camera, binoculars with a shake correction function, a mobile phone with a camera, and the like.

  Moreover, although the said embodiment and modification can be used in combination suitably, since the structure of each embodiment is clear by illustration and description, detailed description of a combination is abbreviate | omitted. Furthermore, the present invention is not limited by the above embodiment.

  1: camera system, 2: camera body, 6: shake correction device, 13: image sensor, 20: movable frame, 21 (21a, 21b): first engaging portion, 22: stepped portion, 30: lock ring, 32 : Second engaging portion, 34: biasing spring, 35: bent portion, 40: fixed frame

Claims (10)

A shake correction optical system that corrects the shake of the image by moving in a cross plane direction parallel to the plane crossing the optical axis;
A member that holds the shake correction optical system and moves in the direction of the intersecting surface together with the shake correction optical system, the first engagement portion protruding in the intersecting surface direction, and one surface of the first engagement portion A movable member having a stepped portion formed on
The movable member is drivably supported at a lock position that restricts movement of the movable member in the direction of the intersecting surface and an unlock position that allows movement of the movable member in the direction of the intersecting surface. A locking member having a second engaging part that can be engaged with the joint part and a biasing member that can come into contact with the step part of the movable member;
A shake correction device comprising:
On the one surface of the first engagement portion, the step portion and a flat portion on which the urging member slides are continuously formed,
When the lock member is driven to the lock position, the first engagement portion of the movable member and the second engagement portion of the lock member are engaged with each other in the direction of the intersecting surface of the movable member. When the force that moves the lock member to the unlock position is applied during the restriction, the biasing member of the lock member is slid on the flat portion of the movable member. by abutting the stepped portion of the movable member, and restricting the movement to the unlocked position of the locking member,
When the lock member is driven to the unlock position, the engagement between the first engagement portion of the movable member and the second engagement portion of the lock member is released, and the intersecting surface of the movable member And the biasing member of the lock member slides on the flat portion of the movable member and then climbs over the stepped portion of the movable member. Allowing movement to the release position,
A shake correction device characterized by the above. The shake correction apparatus according to claim 1,
The lock member has a substantially annular shape when viewed from the optical axis direction,
A shake correction device, wherein a rack gear is formed on the annular outer peripheral surface of the lock member. The shake correction apparatus according to claim 1 or 2,
The biasing member is provided as a pair of members, and each of the biasing members is provided at a position facing each other with the optical axis in between when viewed from the optical axis direction. . The shake correction apparatus according to any one of claims 1 to 3,
The shake correction apparatus according to claim 1, wherein a length of the flat portion in the protruding direction in which the first engaging portion protrudes is larger than a length of the urging member in the protruding direction when viewed from the optical axis direction. The shake correction apparatus according to any one of claims 1 to 4,
The biasing members are provided as a pair of members, and the shake correction is characterized in that the distance between each of the biasing members and the drive member that drives the lock member is substantially equal when viewed from the optical axis direction. apparatus. The shake correction apparatus according to any one of claims 1 to 5 ,
The shake correction apparatus according to claim 1, wherein the movable member is restricted from rotating about an optical axis. The shake correction apparatus according to any one of claims 1 to 6 ,
The shake correcting device according to claim 1, wherein the biasing member includes a bent portion that engages with the stepped portion of the movable member in parallel with an extending direction of the stepped portion. The shake correction apparatus according to any one of claims 1 to 7 ,
The step correction portion is formed on an end portion in a direction in which the lock member moves to the unlock position on one surface of the first engagement portion. The shake correction apparatus according to any one of claims 1 to 8 ,
An angle formed between a tangent of a portion where the stepped portion engages with the biasing member and a perpendicular perpendicular to one surface of the first engaging portion is θ1, and the biasing member is engaged with the stepped portion. A shake correction apparatus characterized in that θ2> θ1 when θ2 is an angle formed between a tangent to a portion to be cut and the perpendicular. Optical system,
The shake correction apparatus according to any one of claims 1 to 9 ,
An optical instrument comprising:

Images