JP4529425B2 - Blur correction device - Google Patents

Description

  The present invention relates to a blur correction device that corrects image blur by moving part or all of a lens with an optical device such as a camera, a lens, a video, or binoculars.

  2. Description of the Related Art Conventionally, as a shake correction device, for example, a device that corrects a shake of an image by shifting a shake correction optical system by an actuator (VCM or the like) in a plane substantially orthogonal to the optical axis of the photographing optical system. Are known.

  Such a shake correction apparatus includes a lock mechanism for holding the shake correction optical system at a specific position when no shake correction is performed. For example, a lock using a rotating ring-shaped member (lock ring) is used. A mechanism has been proposed (see, for example, Patent Document 1).

However, the shake correction apparatus provided with the lock mechanism described above has the following problems.
When the play between the movable group of the shake correcting optical system and the lock ring is set to O, the rotational movement of the lock ring is transmitted to the movable group, and a load is applied to the rotation stopper that prevents the movable group from rotating relative to the base member. This may damage the rotation stopper.

  In order to solve this problem, when a backlash is provided at the engaging portion of the movable group and the lock ring, even if the shake correction optical system is locked (when locked), the shake correction optics may be affected by the posture difference. The position in the direction substantially perpendicular to the optical axis of the system may fluctuate, and optical performance may be deteriorated.

In addition, the engaging portion provided in the lock ring gives a force in the optical axis direction to the movable group, and the position in the optical axis direction of the blur correction optical system fluctuates, which may deteriorate the optical performance. .
JP 09-105969 A

  An object of the present invention is to provide a shake correction apparatus that can reliably perform a locking operation and an unlocking operation without deteriorating optical performance during locking.

The present invention solves the above problems by the following means. In order to facilitate understanding, description will be made with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited to this. That is, the invention of claim 1 is a motion compensation optical member (3) that moves in a plane substantially orthogonal to the optical axis (I) of the photographing optical system to correct motion blur, and the optical axis (I). Than the first surface (100a1, 100b1, 100c1) and the first surface (100a1, 100b1, 100c1) that can rotate around a parallel rotation axis and are inclined so that the distance from the rotation axis is different. first cam portion and a second surface inclined is gradual (100a2,100b2,100c2) (100a, 100b, 100c) and the rotating member (100) having a, with the rotation of said rotary member (100), the the first surface (100a1,100b1,100c1) and said second surface after contact with (100a2,100b2,100c2) and abut, or the second surface and the abutment without contact with the first surface The Rukoto, holding that limits the shake correction range of movement of the optical element (3) within a predetermined range (6f, 6 g, 6h) and the holding section (6f, 6 g, 6h) by the motion compensation optical element In a state where the movement range of (3) is limited to a predetermined range, the movement is performed in a plane substantially orthogonal to the optical axis (I), and is brought into contact with the shake correction optical member (3), whereby the shake is corrected. A locking portion (110) for locking the correction optical member (3), and the rotating member includes a second cam portion having a third surface inclined so as to have a different distance from the rotating shaft, The locking portion moves while contacting the third surface of the second cam portion in accordance with the rotation of the rotating member in a state where the moving range of the blur correction optical member is limited within a predetermined range. The shake correction optical member comes into contact with the shake correction optical member Locking the a motion compensation device according to claim.
The invention of claim 2 is capable of rotating around a rotational axis substantially parallel to the optical axis and a blur correction optical member that corrects blur by moving in a plane substantially orthogonal to the optical axis of the photographing optical system. A rotating member having a first cam portion having a first surface inclined so as to have a different distance from the rotation shaft, and a second surface having a gentler inclination than the first surface; With rotation, the first surface or the second surface can be contacted, and a holding unit that limits a movement range of the blur correction optical member within a predetermined range, and the holding unit, A locking portion that locks the blur correction optical member by moving in a plane substantially orthogonal to the optical axis and contacting the blur correction optical member in a state where the movement range is limited to a predetermined range. And the rotating member is inclined so that the distance from the rotating shaft is different. A second cam portion having a third surface, and the locking portion includes the second cam in accordance with the rotation of the rotating member in a state where a movement range of the shake correcting optical member is limited within a predetermined range. The motion compensation device is configured to contact the motion compensation optical member and engage the motion compensation optical member by moving while contacting the third surface of the portion.
According to a third aspect of the present invention, in the shake correction apparatus according to the first or second aspect, position detection is performed to detect the positions of the first cam portion (100a, 100b, 100c) and the second cam portion (100d). The blur correction device further includes a section (73).
According to a fourth aspect of the present invention, in the shake correction apparatus according to the third aspect, the position detection unit (73) includes a brush (72) and an encoder (71). is there.

The invention of claim 5 is capable of rotating around a rotation axis substantially parallel to the optical axis and a vibration correction optical member that moves in a plane substantially orthogonal to the optical axis of the photographic optical system and corrects the vibration. A rotating member having a first cam portion having a first surface inclined so as to have a different distance from the rotation shaft, and a second surface having a gentler inclination than the first surface; With the rotation, the movement range of the blur correction optical member is brought into contact with the second surface after contacting with the first surface or with the second surface without contacting with the first surface. In a state where the movement range of the blur correction optical member is restricted within a predetermined range by the holding unit that restricts the optical axis within a predetermined range, and moves in a plane substantially orthogonal to the optical axis, A mechanism for locking the shake correction optical member by contacting the shake correction optical member. And parts, provided with a restricting portion (9, 10, 11) having a shaft (9, 11) for restricting the movement of the motion compensation optical element (3), the locking portion (110), said shaft (9, 11) A blur correction device characterized by being movable substantially parallel to the longitudinal direction.
The invention of claim 6 is capable of rotating around a rotation axis that is substantially parallel to the optical axis and a vibration correction optical member that moves in a plane substantially orthogonal to the optical axis of the photographing optical system and corrects the vibration. A rotating member having a first cam portion having a first surface inclined so as to have a different distance from the rotation shaft, and a second surface having a gentler inclination than the first surface; With rotation, the first surface or the second surface can be contacted, and a holding unit that limits a movement range of the blur correction optical member within a predetermined range, and the holding unit, A locking portion that locks the blur correction optical member by moving in a plane substantially orthogonal to the optical axis and contacting the blur correction optical member in a state where the movement range is limited to a predetermined range. And a restricting portion having an axis for restricting movement of the shake correcting optical member. , The locking portion, it is movable longitudinally and substantially parallel to the axis, a motion compensation device according to claim.
A seventh aspect of the present invention is the blur correction device according to any one of the first to sixth aspects, wherein the distance between the second surface (100a2, 100b2, 100c2) and the rotation shaft is substantially constant. This is a shake correction apparatus characterized by the above.
According to an eighth aspect of the present invention, in the blur correction device according to any one of the first to seventh aspects, the locking portion (110) includes an elastic member (111), and the elastic member ( 111), which is brought into contact with the blur correction optical member (3) via 111).

The invention according to claim 9 is the shake correction device according to any one of claims 1 to 8 , wherein the locking portion (110) locks the shake correction optical member (3). The blur correction device is characterized in that the optical axis of the blur correction optical member (3) substantially coincides with the optical axis (I) of the photographing optical system excluding the blur correction optical member (3).

A tenth aspect of the present invention is a camera system including the blur correction device according to any one of the first to ninth aspects.

The blur correction device according to the present invention includes: (1) a rotating member including a cam portion having a first surface inclined so as to have a different distance from the rotation axis, and a second surface having a gentler inclination than the first surface; The holding unit that limits the movement range of the shake correction optical member to a predetermined range as the rotating member rotates, and the movement axis of the shake correction optical member within the predetermined range is substantially orthogonal to the optical axis. By moving in the plane and abutting against the shake correcting optical member, the locking portion for locking the shake correcting optical member is provided, so that the locking operation and the optical performance at the time of locking are not deteriorated. The unlocking operation can be performed reliably.

(2) Since the distance between the second surface and the rotation axis is substantially constant, the movement range of the vibration reduction optical member can be limited within a predetermined range as the rotation member rotates.

(3) The rotating member includes a second cam portion having a third surface inclined so as to have a different distance from the rotating shaft, and the locking portion has a movement range of the shake correcting optical member restricted within a predetermined range. In this state, as the rotating member rotates, it moves while abutting against the third surface of the second cam portion, thereby abutting on the blur correcting optical member and locking the blur correcting optical member. Accordingly, the locking operation can be performed reliably.

(4) Since the locking portion has an elastic member and abuts against the shake correction optical member via the elastic member, the elastic member is elastically deformed when locked, and the locking operation can be reliably performed.

(5) A restriction portion having a shaft for restricting the movement of the blur correction optical member is further provided, and the locking portion can move substantially parallel to the longitudinal direction of the shaft. There is no excessive load on the part.

(6) When the locking portion locks the shake correction optical member, the optical axis of the shake correction optical member substantially coincides with the optical axis of the photographing optical system excluding the shake correction optical member. Will not worsen.

(7) Since the position detection unit for detecting the positions of the first cam unit and the second cam unit is provided, the position of the cam unit accompanying the rotation of the rotating member can be detected.

(8) Since the position detection unit includes the brush and the encoder, the position of the cam unit can be detected based on the rotation angle of the rotation member.

(9) a first surface having a rotation axis substantially parallel to the optical axis of the photographing optical system, rotatable about the rotation axis, and inclined so that a distance from the rotation axis is different; A rotating member having a first cam portion having a second surface with a gentler slope than the second member, and after contacting the first surface as the rotating member rotates, or directly adjacent to the second surface or And a holding portion that limits the movement range of the shake correction optical member within a predetermined range by abutting, and the cam portion has a slope surface inclined with respect to the direction of the optical axis. The optical axis direction can be stabilized.

(10) A base member that supports the blur correction optical member and an urging member that pulls the blur correction optical member toward the base member are further provided, and the gradient surface increases the force that pulls the blur correction optical member toward the base member. Therefore, the blur correction optical member can be stabilized with respect to the base member without releasing the biasing force of the biasing member that draws the blur correction optical member to the base member.

  The best mode for carrying out the invention will be described below with reference to the drawings and the like.

FIG. 1 is a schematic view showing a camera system including a shake correction apparatus according to the present invention.
The camera system 70 includes a lens barrel 2 and a camera body 1 to which the lens barrel 2 is attached. The lens barrel 2 is, for example, a six-group zoom lens, and includes a first lens group 51, a second lens group 52, a third lens group 53, a fourth lens group 54, and a fifth lens. A group 55, a sixth lens group 56, a diaphragm 57, and the like are provided.
In the lens barrel 2, the first lens group 51, the third lens group 53, the fifth lens group 55, and the sixth lens group 56 are in the same direction as the optical axis I (in the direction of the arrows X1-X2) at the time of zooming. Zooming is performed by moving in the direction (hereinafter referred to as the optical axis I direction).

The first lens group 51 is a focus adjustment lens group that connects an image of a subject to the image plane 1a by moving in the direction of the optical axis I.
The second lens group 52 and the fourth lens group 54 do not move in the direction of the optical axis I during zooming and focus adjustment. The second lens group 52 includes a shake correction lens 3 and non-blur correction lenses 4 and 5.

  The blur correction lens 3 is driven in a plane substantially orthogonal to the optical axis I direction by a driving mechanism (described later) (Bx, By direction: see FIG. 2), and further held by a holding mechanism (described later). This is a blur correction optical system that corrects image blur by being locked by a lock mechanism (described later).

FIG. 2 is a diagram illustrating a drive mechanism, a holding mechanism, and a lock mechanism of the shake correction apparatus according to the present embodiment.
FIG. 3 is a cross-sectional view taken along the line AA of the shake correction apparatus according to the present embodiment.
FIG. 4 is a cross-sectional view of the blur correction device according to the present embodiment taken along the line BB.
FIG. 5 is a cross-sectional view taken along the line CC of the shake correction apparatus according to the present embodiment.
First, the drive mechanism of the shake correction apparatus according to the present embodiment will be described mainly with reference to FIGS.
The blur correction lens 3 is fixed to the lens frame 6. The lens frame 6 is driven in the By direction and the Bx direction in FIG. 2 by voice coil motors (hereinafter referred to as VCM) 40 and 41. Two coils 12 and 16 are fixed to the lens frame 6. As shown in FIG. 5, the VCM 40 includes a yoke 13, a coil 12, a permanent magnet 14, a yoke 15, and the like. The yoke 13 is fixed to the base member 7.

  The yoke 15 is fixed to the casing member 8, and the permanent magnet 14 is fixed on the yoke 13. The coil 12 is disposed between the yoke 15 and the permanent magnet 14. Therefore, when a current is passed through the coil 12, the coil 12 receives a force in the By direction in FIG. 2 and drives the blur correction lens 3 in the By direction.

Similarly, the VCM 41 includes a yoke 17, a coil 16, a permanent magnet 18, a yoke 19, and the like.
The yoke 17 is fixed to the base member 7. The yoke 19 is fixed to the casing member 8, and the permanent magnet 18 is fixed on the yoke 17. The coil 16 is disposed between the yoke 19 and the permanent magnet 18. Therefore, when a current is passed through the coil 16, the coil 16 receives a force in the Bx direction in FIG. 2 and drives the blur correction lens 3 in the Bx direction.

The position sensor for detecting the position of the blur correction lens 3 includes slit members 24 and 25 provided with slits shown in FIGS. 2 and 5, LEDs 20 and 22, PSDs 21 and 23, and the like.
The slit members 24 and 25 and the LEDs 20 and 22 are fixed to the lens frame 6. The PSDs 21 and 23 are fixed to the base member 7. Light emitted from the LEDs 20 and 22 passes through slits provided in the slit members 24 and 25 and reaches the PSDs 21 and 23.

  Therefore, the position of the light reaching the PSDs 21 and 23 is moved depending on the position where the blur correction lens 3 is moved, and the output signals of the PSDs 21 and 23 are changed. With this signal, the position of the blur correction lens 3 in the Bx and By directions can be detected.

As shown in FIGS. 2 and 4, the lens frame 6 is engaged with the guide shaft 9 by hook portions 6 d and 6 e, and the lens frame 6 is in the longitudinal direction of the guide shaft 9 with respect to the guide shaft 9. It is movable.
The guide shaft 9 is rotatably fixed to the guide arm 10. As shown in FIG. 4, the guide arm 10 is fixed to a shaft 11 fixed to the base member 7 so as to be rotatable around the shaft.

  Therefore, the rotation of the lens frame 6 around the optical axis I is restricted by the guide shaft 9 but is movable in the longitudinal direction of the guide shaft 9, and the guide shaft 9 is substantially perpendicular to the longitudinal direction. Can be displaced in both the By direction and the Bx direction.

Next, the holding mechanism of the shake correction apparatus according to the present embodiment will be described mainly with reference to FIGS.
As shown in FIGS. 3 and 4, the holding mechanism for holding the shake correction lens 3 includes sliding receiving members 31, 32, 33, sliding pieces 34, 35, 36, and biasing springs 37, 38, 39 etc. The base member 7 and the casing member 8 are fixed from the thrust direction by fixing screws 45, 46, 47.
The slide receiving members 31, 32, and 33 are fixed to the base member 7 around the blur correction lens 3. The sliding pieces 34, 35, and 36 are fixed to the lens frame 6 at positions facing the sliding receiving members 31, 32, and 33, respectively. The sliding receiving members 31, 32, 33 and the sliding pieces 34, 35, 36 are in contact with each other to form a sliding portion.

Further, the lens frame 6 is urged by springs 37, 38, 39 spanned between the spring hanging portions 6a, 6b, 6c of the lens frame 6 and the spring hanging portions 7a, 7b, 7c of the base member 7. The sliding pieces 34, 35, and 36 are biased so as to contact the sliding receiving members 31, 32, and 33.
Accordingly, the lens frame 6 is urged in the X1 direction by the above-described sliding portions (here, three locations) with a low load and can be moved smoothly, and does not float in the optical axis I direction. The base member 7 holds.

Next, the lock mechanism of the shake correction apparatus according to the present embodiment will be described mainly with reference to FIGS.
As shown in FIGS. 2 and 3, the lock mechanism for locking the shake correction lens 3 at a specific position includes a lock ring 100, a lock pin 110, a lock pin rubber 111, a lock pin spring 112, a lock pin collar 113, and the like. It has.

  The lock ring 100 is rotatably supported with respect to the base member 7 and the casing member 8, and further has a rotation axis (not shown) substantially parallel to the optical axis I. The lock ring 100 is provided with cams 100a, 100b, 100c and a pin cam 100d. The cams 100a, 100b, and 100c are inclined surfaces 100a1, 100b1, and 100c1, which are inclined so as to have different distances from the rotation shaft, and surfaces that are continuous with the inclined surfaces 100a1, 100b1, and 100c1, as illustrated. The surfaces 100a2, 100b2, and 100c2 have a substantially constant distance from the rotation axis. Note that the surfaces 100a2, 100b2, and 100c2 may be circumferential surfaces, flat surfaces that are inclined more gently than the inclined surfaces 100a1, 100b1, and 100c1.

  Therefore, when the lock ring 100 is rotated counterclockwise (in the “LOCK” direction in FIG. 2) by an appropriate external operation or the like, and the locking operation is started, the cams 100a, 100b, and 100c are provided on the lens frame 6. The lock engaging portions 6f, 6g, 6h are engaged. Details of the locking operation will be described later (see FIG. 6).

  The lock pin 110 is supported by the lock pin support portions 7d and 7e of the base member 7, and is a direction substantially perpendicular to the optical axis I direction and approaching the optical axis I (Y1 direction in FIG. 1) and light. It can move in a direction away from the axis I (Y2 direction in FIG. 1). A lock pin rubber 111, which is an elastic member, is provided on the inner peripheral side of the lock pin 110 (here, the Y1 direction side).

  A lock pin collar 113 is attached to the lock pin 110 and is urged in the Y2 direction by a lock pin spring 112. The Y2 direction side of the lock pin 110 is engaged with a pin cam 100d provided on the lock ring 100 as shown in FIGS. The pin cam 100d is an inclined surface 100d1 having a different inclination angle from the inclined surfaces 100a1, 100b1, and 100c1 of the cams 100a, 100b, and 100c described above, and a surface that is continuous with the inclined surface 100d1, for example, a rotating shaft. The surface 100d2 has a substantially constant distance. Note that the surface 100d2 may be a circumferential surface, a flat surface having a gentler inclination than the inclined surface 100d1, or the like.

  FIG. 6 is a diagram showing in detail the locking operation of the locking mechanism accompanying the rotation of the lock ring 100. The horizontal axis represents the rotation angle of the lock ring 100, and the vertical axis represents the clearance. Here, the clearance includes a first clearance (a dashed line in the drawing) that is a distance between the lock pin rubber 111 that is an end portion of the lock pin 110 on the Y1 direction side and the blur correction lens 3, and a lens frame 6. The second clearance (solid line in the figure) that is the largest (separated) value among the distances between the lock engaging portions 6f, 6g, 6h and the surfaces 100a2, 100b2, 100c2 of the cams 100a, 100b, 100c. is there. The clearance assumes that the lens frame 6 that is movable in the By direction and the Bx direction is held at the center by the drive mechanism described above.

The lock ring 100 can be rotated in a range of rotation angles 0 to θ4, and the rotation of the lock ring 100 is restricted by, for example, a rotation restricting unit (not shown). Further, the shake correction apparatus includes a cam position detection unit 73 for detecting the positions of the cams 100a, 100b, 100c and the pin cam 100d according to the rotation angle of the lock ring 100.
The cam position detection unit 73 includes, for example, a brush 72 provided on the lock ring 100 and an encoder 71 provided on the fixing member, and the relative relationship between the brush 72 and the encoder 71 that changes according to the rotation of the lock ring 100. The positions of the cams 100a, 100b, 100c and the pin cam 100d are detected by generating a desired pulse signal according to the position.

Hereinafter, the locking operation according to the rotation angle of the lock ring 100 will be described.
(When unlocking)
At the time of unlocking (rotation angle 0), both the first clearance and the second clearance are d1. Note that d1 is, for example, the height in the direction perpendicular to the rotation axes of the cams 100a, 100b, 100c and the pin cam 100d, and is defined by the distance between the lens frame 6 and the base member 7 described above.
The lock engaging portions 6f, 6g, 6h are located in the vicinity of the inclined surfaces 100a1, 100b1, 100c1, and are not in contact with the inclined surfaces 100a1, 100b1, 100c1.

  Similarly, the end of the lock pin 110 on the Y2 direction side is located in the vicinity of the inclined surface 100d1, and is not in contact with the inclined surface 100d1. Further, in this state, the lock pin collar 113 provided on the lock pin 110 is in contact with the lock pin support portion 7e provided on the base member 7 by the urging force of the lock pin spring 112. Reference numeral 110 denotes a position separated from the lock ring 100 by a predetermined distance (this distance is defined by the mounting position of the lock pin collar 113).

(During lock operation: transition to the lock state)
First, at the start of the locking operation (rotation angle 0 to θ1), one or two of the lock engaging portions 6f, 6g, and 6h are applied to the inclined surfaces 100a1, 100b1, and 100c1 according to the rotation of the lock ring 100. The second clearance is reduced from d1 while moving while abutting, and the moving range of the blur correction lens 3 is limited.
Since the lock pin 110 is in a state where the end of the lock pin 110 on the Y2 direction side and the inclined surface 100d1 are not in contact with each other, the lock pin rubber 111 provided on the Y1 direction side of the lock pin 110 and the shake correction lens are arranged. The first clearance with 3 remains unchanged at d1.

  Next, at the time of the first transition of the locking operation (rotational angles θ1 to θ2), one or two of the lock engaging portions 6f, 6g, and 6h of the lock ring 100 are the same as at the start of the locking operation. In accordance with the rotation, the lens further moves while contacting the inclined surfaces 100a1, 100b1, and 100c1 to bring the center of the blur correction lens 3 closer to the optical axis I. Further, as shown in the figure, the second clearance is reduced to d2 (described later).

On the other hand, the end of the lock pin 110 on the Y2 direction side contacts the inclined surface 100d1 at the rotation angle θ1 and then moves in the Y1 direction while contacting the inclined surface 100d1, so that the lock pin rubber The first clearance between 111 and the shake correction lens 3 decreases as the lock ring 100 rotates.
Therefore, the lock pin 110 reduces the clearance at a delayed timing with respect to the lock engaging portions 6f, 6g, and 6h. This timing adjustment can be performed by forming the inclination angles of the inclined surfaces 100a1, 100b1, and 100c1 different from the inclination angle of the inclined surface 100d1 of the pin cam 100d. Specifically, the timing described above can be delayed as the inclination angle of the inclined surface 100d1 becomes smaller than the inclination angles of the inclined surfaces 100a1, 100b1, and 100c1.
As a result, the lock pin 110 can reduce the first clearance after the lock engaging portions 6f, 6g, and 6h contact the inclined surfaces 100a1, 100b1, and 100c1 and the lock ring 100 rotates by a predetermined angle (θ1). it can.

Next, at the time of the second transition of the locking operation (rotational angles θ2 to θ3), one of the lock engaging portions 6f, 6g, 6h is a surface 100a2, 100b2, 100c2 that is continuous with the inclined surfaces 100a1, 100b1, 100c1. And d2 are reached. Accordingly, the lock engaging portions 6f, 6g, 6h and the inclined surfaces 100a1, 100b1, 100c1 are close to each other.
In this case, the movement range of the blur correction lens 3 is limited to a predetermined range defined by the proximity of the lock engaging portions 6f, 6g, and 6h and the inclined surfaces 100a1, 100b1, and 100c1. Here, d2 is a gap for preventing the lens frame 6 and the lock ring 100 from biting (such as a tight fit) and performing the unlocking operation with certainty. That is, the second clearance remains d2 as shown in the figure.

On the other hand, the end of the lock pin 110 on the Y2 direction side moves in the Y1 direction while coming into contact with the inclined surface 100d1 at the rotation angle θ1 and then contacting the inclined surface 100d1 until the rotation angle θ3. As a result, the first clearance is reduced, the end of the lock pin 110 on the Y2 direction side reaches the surface 100d2 at the rotation angle θ3, and the lock pin rubber 111 abuts against the blur correction lens 3 (here, the first 1 clearance is 0).
Accordingly, the lock pin 110 further moves in the Y1 direction even after the lock engaging portions 6f, 6g, and 6h have reached the positions separating the surfaces 100a2, 100b2, 100c2, and d2.

(When locked: About locked state)
At the time of locking (rotation angles θ3 to θ4), the lock engaging portions 6f, 6g, and 6h are located at positions separating the surfaces 100a2, 100b2, 100c2, and d2, as described above, and do not change.
On the other hand, as described above, the end of the lock pin 110 on the Y2 direction side reaches the surface 100d2 and is in contact with the surface 100d2. Further, the lock pin rubber 111 is in contact with the blur correction lens 3 and is elastically deformed. For this reason, the lock pin 110 can lock the shake correction lens 3 when locked.
In addition, since the blur correction lens 3 is locked by the lock pin 110, the lens frame 6 is held without any play in the lock ring 100 via the lock pin 110, and the lock engagement portions 6f and 6g. , 6h are in contact with the surfaces 100a2, 100b2, and 100c2, respectively (see FIG. 3).

  Further, the Y2 direction end of the lock pin 110 abuts against the surface 100d2, and the lock pin rubber 111 abuts against the blur correction lens 3 and elastically deforms (that is, the lock pin 110 locks the blur correction lens 3). By doing so, the center (optical axis) of the blur correction lens 3 brought close to the optical axis I by the lock engaging portions 6f, 6g, and 6h is made to substantially coincide with the optical axis I. 5 can also be made substantially coincident with the center (optical axis).

  Furthermore, since the movement direction of the lock pin 110 is substantially parallel to the longitudinal direction of the guide shaft 9 and the guide arm 10, even when a load is applied from the lock pin rubber 111 to the lens frame 6, the guide shaft 9. And the guide arm 10 is not deformed.

In the operation at the time of locking described above, when the center of the vibration reduction lens 3 is already in the vicinity of the optical axis I when the rotation is released (rotation angle 0), the lock engaging portions 6f, 6g, 6h are The cams 100a, 100b, and 100c do not come into contact with the inclined surfaces 100a1, 100b1, and 100c1, but directly come across the surfaces 100a2, 100b2, 100c2, and d2. In this case, at the time of locking (rotation angles θ3 to θ4), the lock pin 110 engages the blur correction lens 3, so that the center (optical axis) of the blur correction lens 3 is adjusted to the optical axis I and the non-blurring correction. It can be made to substantially coincide with the center (optical axis) of the lenses 4 and 5.
Further, with respect to the unlocking operation, it is only necessary to reversely rotate the lock ring 100 (rotation angles θ4 to θ3 to θ2 to θ1 to 0). In particular, since the second clearance remains unchanged at d2 between the rotation angles θ4 to θ3 to θ2, the blur correction device can reliably perform the unlocking operation with the reverse rotation of the lock ring 100.

FIG. 7 is an enlarged view showing a part of the holding mechanism of the shake correction apparatus according to the present embodiment.
The cams 100a, 100b, and 100c are provided with inclined surfaces 100a3, 100b3, and 100c3 that are inclined with respect to the direction of the optical axis I as shown in the figure. The inclination directions of the inclined surfaces 100a3, 100b3, and 100c3 are inclined toward the X1 direction side (here, the inclination angle α), and the biasing springs 37, 38, and the like that attract the blur correction lens 3 to the base member 7. It is inclined so that the urging force of 39 does not escape.

  Therefore, at the time of the second transition of the locking operation (rotation angles θ2 to θ3) and at the time of locking (rotation angles θ3 to θ4), as described above, even if the second clearance is d2, the lens frame 6 However, no force is applied in the X2 direction. Therefore, the lens frame 6 does not become unstable (floats) with respect to the base member 7, and the shake correction lens 3 does not float with respect to the optical axis I direction.

According to the present embodiment, (1) after the movement range of the blur correction lens 3 is limited as the lock ring 100 rotates, the center of the blur correction lens 3 and the optical axis I are made to substantially coincide with each other by the lock pin 110. As a result, the optical performance at the time of locking is not deteriorated.
(2) Since the second clearance is constant (d2) even at the time of locking, it is possible to prevent the lens frame 6 and the lock ring 100 from biting, and the unlocking operation can be performed reliably.
(3) Since the movement direction of the lock pin 110 is substantially parallel to the longitudinal direction of the guide shaft 9 and the guide arm 10, when the load is applied from the lock pin rubber 111 to the lens frame 6, the guide shaft 9 and the guide It is possible to prevent the arm 10 from being deformed.
(4) Even after the second clearance becomes constant (d2), the first clearance becomes further smaller and proceeds until it reaches 0. Thereafter, the lock pin rubber 111 is elastically deformed, and the lens frame 6 is fixedly held. The time during which the rotational force of the lock ring 100 is transmitted to the lens frame 6 can be reduced. As a result, the members such as the guide shaft 9 and the guide arm 10 are deformed by the rotational force of the lock ring 100. In addition, even when the lock ring 100 is rotated at a high speed, the above-described locking operation does not cause a malfunction.
(5) Since the inclined surfaces 100a3, 100b3, and 100c3 are provided on the cams 100a, 100b, and 100c, the urging forces of the urging springs 37, 38, and 39 that draw the blur correction lens 3 toward the base member 7 are rotated by the lock ring 100. Accordingly, it is possible to prevent the camera from becoming unstable and to prevent the blur correction lens 3 from floating with respect to the direction of the optical axis I.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) The timing delay (rotation angle 0 to θ1) of the lock pin 110 with respect to the lock engaging portions 6f, 6g, and 6h is adjusted by the inclination angles of the inclined surfaces 100a1, 100b1, 100c1, and 100d1, but for example, the cam 100a , 100b, 100c, the relative position of the pin cam 100d may be changed to adjust the timing delay, and the adjustment may be performed by changing the mounting position of the lock pin collar 113 described above. It may be.

(2) Three lock engaging portions 6f, 6g, and 6h are provided on the lens frame 6 around the blur correction lens 3. However, as the lock ring 100 rotates, the center of the blur correction lens 3 moves to the optical axis. If it can be close to I, an appropriate number may be provided.

(3) The blur correction lens 3 is supported on one side by the base member 7 by the guide shaft 9, the guide arm 10, the shaft 11, and the like, and is attached in the optical axis I direction by the biasing springs 37, 38, 39 and the like which are elastic members. However, as long as the blur correction lens 3 can be urged (pulled) in the direction of the optical axis I, not only the urging spring but also an appropriate elastic member may be used.

(4) Although the cam position detection unit 73 includes the encoder 71 and the brush 72, the cam position detection unit 73 can detect the positions of the cams 100 a, b, c and the pin cam 100 d based on the rotation angle of the lock ring 100. For example, an appropriate sensor such as a photo interrupter may be used.

It is the schematic which shows the camera system provided with the blurring correction apparatus by this invention. It is a figure which shows the drive mechanism, holding | maintenance mechanism, and locking mechanism of the blurring correction apparatus by a present Example. It is AA sectional drawing of the blurring correction apparatus by a present Example. It is BB sectional drawing of the blurring correction apparatus by a present Example. It is CC sectional drawing of the blurring correction apparatus by a present Example. FIG. 4 is a diagram illustrating in detail a locking operation of the locking mechanism accompanying the rotation of the lock ring 100. It is an enlarged view which shows a part of holding mechanism of the blurring correction apparatus by a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera body 2 Lens barrel 3 Shake correction lens 6 Lens frame 6f, g, h Lock engaging part 7 Base member 7a, b, c Spring hook part 7d, 7e Lock pin support part 9 Guide shaft 10 Guide arm 11 Shaft 21 , 23 PSD
31-33 Sliding receiving material 34-36 Sliding piece 37-39 Biasing spring 40, 41 VCM
70 Camera System 71 Encoder 72 Brush 73 Cam Position Detection Unit 1OO Lock Ring 100a, b, c Cam 100a1, b1, c1 Inclined Surface 100a2, b2, c2 Surface 100d Pin Cam 110 Lock Pin 111 Lock Pin Rubber

Claims (10)

A blur correction optical member that moves in a plane substantially orthogonal to the optical axis of the photographing optical system and corrects blur;
A first surface that is rotatable about a rotation axis that is substantially parallel to the optical axis and that is inclined so as to have a different distance from the rotation axis, and a second surface that is inclined more gently than the first surface. A rotating member having a first cam portion having;
With the rotation of the rotating member, the image stabilization optical system is configured to contact the second surface after contacting the first surface, or contact the second surface without contacting the first surface. A holding unit that limits the movement range of the member within a predetermined range;
The holding unit moves in a plane substantially orthogonal to the optical axis in a state where the movement range of the shake correction optical member is limited to a predetermined range, and comes into contact with the shake correction optical member. A locking portion for locking the shake correcting optical member,
The rotating member includes a second cam portion having a third surface inclined so as to have a different distance from the rotating shaft,
The locking portion moves while contacting the third surface of the second cam portion in accordance with the rotation of the rotating member in a state where the moving range of the blur correction optical member is limited within a predetermined range. The shake correction optical device is configured to contact the shake correction optical member and lock the shake correction optical member. A blur correction optical member that moves in a plane substantially orthogonal to the optical axis of the photographing optical system and corrects blur;
A first surface that is rotatable about a rotation axis that is substantially parallel to the optical axis and that is inclined so as to have a different distance from the rotation axis, and a second surface that is inclined more gently than the first surface. A rotating member having a first cam portion having;
A holding unit that can come into contact with the first surface or the second surface as the rotating member rotates and limits a movement range of the shake correcting optical member within a predetermined range;
The holding unit moves in a plane substantially orthogonal to the optical axis in a state where the movement range of the shake correction optical member is limited to a predetermined range, and comes into contact with the shake correction optical member. A locking portion for locking the shake correcting optical member,
The rotating member includes a second cam portion having a third surface inclined so as to have a different distance from the rotating shaft,
The locking portion moves while contacting the third surface of the second cam portion in accordance with the rotation of the rotating member in a state where the moving range of the blur correction optical member is limited within a predetermined range. The shake correction optical device is configured to contact the shake correction optical member and lock the shake correction optical member. The blur correction device according to claim 1 or 2,
A shake correction apparatus, further comprising a position detection unit that detects positions of the first cam unit and the second cam unit. The blur correction device according to claim 3,
The position correction unit includes a brush and an encoder. A blur correction optical member that moves in a plane substantially orthogonal to the optical axis of the photographing optical system and corrects blur;
A first surface that is rotatable about a rotation axis that is substantially parallel to the optical axis and that is inclined so as to have a different distance from the rotation axis, and a second surface that is inclined more gently than the first surface. A rotating member having a first cam portion having;
With the rotation of the rotating member, the image stabilization optical system is configured to contact the second surface after contacting the first surface, or contact the second surface without contacting the first surface. A holding unit that limits the movement range of the member within a predetermined range;
The holding unit moves in a plane substantially orthogonal to the optical axis in a state where the movement range of the shake correction optical member is limited to a predetermined range, and comes into contact with the shake correction optical member. A locking portion for locking the shake correcting optical member;
A regulation unit having an axis that regulates movement of the blur correction optical member,
The blur correction device characterized in that the locking portion is movable substantially parallel to the longitudinal direction of the shaft. A blur correction optical member that moves in a plane substantially orthogonal to the optical axis of the photographing optical system and corrects blur;
A first surface that is rotatable about a rotation axis that is substantially parallel to the optical axis and that is inclined so as to have a different distance from the rotation axis, and a second surface that is inclined more gently than the first surface. A rotating member having a first cam portion having;
A holding unit that can come into contact with the first surface or the second surface as the rotating member rotates and limits a movement range of the shake correcting optical member within a predetermined range;
The holding unit moves in a plane substantially orthogonal to the optical axis in a state where the movement range of the shake correction optical member is limited to a predetermined range, and comes into contact with the shake correction optical member. A locking portion for locking the shake correcting optical member;
A regulation unit having an axis that regulates movement of the blur correction optical member,
The blur correction device characterized in that the locking portion is movable substantially parallel to the longitudinal direction of the shaft.   The shake correction apparatus according to any one of claims 1 to 6, wherein a distance between the second surface and the rotation shaft is substantially constant. The blur correction device according to any one of claims 1 to 7,
The locking portion has an elastic member,
A shake correction apparatus, wherein the shake correction optical member is brought into contact with the elastic member through the elastic member. The blur correction device according to any one of claims 1 to 8,
When the locking portion locks the shake correction optical member, the optical axis of the shake correction optical member substantially coincides with the optical axis of the photographing optical system excluding the shake correction optical member. Blur correction device. Camera system comprising a motion compensation device according to any one of claims 1 to 9.

Images