JP2016014764A - Image blur correction device, and lens barrel and optical equipment comprising same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image blur correction device capable of preventing clinging of a movable member even when subjected to drop impact; and a lens barrel and optical equipment comprising the image blur correction device.SOLUTION: An image blur correction device includes a fixation member, a movable member, a guide member, a first rolling ball, a second rolling ball, a first guide part and a second guide part, and drives the movable member with respect to the fixation member in a direction perpendicular to an optical axis. The image blur correction device includes, as a member for restricting detachment of the first rolling ball from the first guide part in a direction orthogonal to a first direction, a first stopper on one surface and a first stopper opposite wall on the other surface of the opposite surfaces of the fixation member and the guide member, and as a member for restricting detachment of the second rolling ball from the second guide part in a direction orthogonal to a second direction, a second stopper on one surface and a second stopper opposite wall on the other surface of the opposite surfaces of the guide member and the movable member.

Description

  The present invention relates to an image blur correction apparatus, a lens barrel using the same, and an optical apparatus.

  2. Description of the Related Art Conventionally, in an optical apparatus such as a digital camera, there is an image blur correction apparatus for preventing image blur that is likely to occur due to camera shake during shooting. This image shake correction apparatus detects, for example, an image shake state in a lens barrel provided in an optical device by a detection unit, and based on the detection result, the image shake correction lens is within a plane orthogonal to the optical axis. It is common to have a configuration for shifting. In this case, the image blur is eliminated by moving the correction lens in the direction in which the camera shake is absorbed in the plane orthogonal to the optical axis and correcting the shift of the imaging position due to the camera shake.

  As such an image blur correction device, a lens using a guide bar for restricting the movement direction in two directions perpendicular to the optical axis direction of a moving frame holding a part of an image blur correcting lens group of the optical system A lens barrel is known (Patent Document 1).

  In the image blur correction apparatus of Patent Document 1, there is a first guide bar for guiding the pitch guide base in the yaw direction (lateral direction), and the first guide bar is fixed and held on the shift base. Therefore, the pitch guide base is configured to move only in the yaw direction along the first guide bar with respect to the shift base.

  Further, in the image blur correction apparatus of Patent Document 1, there is a second guide bar for guiding the moving frame in the pitch direction (vertical direction), and the second guide bar is fixed and held on the pitch guide base. Therefore, the moving frame is configured to move only in the pitch direction along the second guide bar with respect to the pitch guide base. With these configurations, the moving frame can move freely in the pitch direction and the yaw direction with respect to the shift base.

JP 2009-192899 A

  However, the image blur correction device of Patent Document 1 has a problem that the friction load is high because the moving direction of the moving frame and the pitch guide base is regulated by the guide bar. In order to reduce the friction load, it is conceivable to use rolling friction balls instead of sliding friction guide bars in the configuration of the moving frame, pitch guide base, and shift base.

  Here, when a ball of rolling friction is used, it is necessary to cope with the ball held in the V groove coming off due to a drop impact. Therefore, in order to prevent such a ball from coming off, a fixed wall is provided in front of the optical axis (subject side) with respect to the moving frame, and is necessary for the moving frame to move between the moving frame and the fixed wall. It is conceivable that a certain interval is secured so that the balls do not fall off.

  However, since the V-groove has a slope, there is a case where the ball rides on the slope when it receives a drop impact and is located on the slope. At this time, the distance between the moving frame and the fixed wall is reduced, and finally, the contact pressure increases to increase the contact pressure, which may cause the moving frame as a movable member to become inoperable.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image blur correction device capable of avoiding biting of a movable member even when subjected to a drop impact, a lens barrel using the same, and an optical instrument.

  In order to achieve the above object, an image shake correction apparatus according to the present invention holds a fixed member and an image shake correction element, and is movable relative to the fixed member in a plane perpendicular to the optical axis of the image shake correction element. A movable member that is movable with respect to the fixed member in a plane perpendicular to the optical axis, and that guides the movable member so as not to rotate in a plane perpendicular to the optical axis, and the fixed member A first rolling ball provided between the guide member and the first rolling ball, a second rolling ball provided between the guide member and the movable member, and a first rolling ball sandwiched between the first rolling ball and the first rolling ball. A first guide portion that guides in a direction, and a second guide portion that sandwiches the second rolling ball and guides the second rolling ball in a second direction different from the first direction, and the movable member is Drive in a direction perpendicular to the optical axis with respect to the fixed member An image blur correction device, wherein the fixing member and the guide member are arranged as members for restricting the first rolling ball from coming off from the first guide portion in a direction orthogonal to the first direction. Of the opposing surfaces, one has a first stopper and the other has a first stopper facing wall, and the second rolling ball is separated from the second guide portion in a direction perpendicular to the second direction. Among the opposing surfaces of the guide member and the movable member, a member for regulating the above is characterized by having a second stopper on one side and a second stopper facing wall on the other side.

  A lens barrel and an optical apparatus according to the present invention include the image blur correction device.

  According to the present invention, it is possible to provide an image blur correction device that can avoid the biting of the movable member even when subjected to a drop impact, a lens barrel using the image blur correction device, and an optical apparatus.

It is sectional drawing which shows the structure of the lens barrel which mounts the image blurring correction apparatus which concerns on embodiment of this invention. FIG. 3 is an assembled perspective view of the image shake correction apparatus according to the first embodiment of the present invention viewed from the subject side. FIG. 3 is an assembled perspective view of the image shake correction apparatus according to the first embodiment viewed from the image plane side. FIG. 6 is a state diagram when the first rolling ball is not riding on the first V groove in the first embodiment. It is a state figure when the pitch guide base moves Y1 in the pitch direction in the first embodiment. It is a state figure when the 2nd rolling ball has not run over the 3rd V slot in a 1st embodiment. FIG. 6 is a state diagram when the shift frame is moved X2 in the yaw direction in the first embodiment. It is a state figure when the 1st rolling ball has not ridden on the 1st V slot in a 2nd embodiment. It is a state figure when the pitch guide base moves Y1 in the pitch direction in the second embodiment. It is a state figure when the 2nd rolling ball has not run over the 3rd V slot in a 2nd embodiment. It is a state figure when the pitch guide base moves Y1 in the pitch direction in the second embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<< First Embodiment >>
(Lens barrel and optical equipment)
First, the configuration of a lens barrel on which an image shake correction apparatus according to an embodiment of the present invention is mounted will be described. Here, the lens barrel is employed as an optical apparatus in an imaging apparatus such as a digital still camera, a video camera, or a surveillance camera, or a projector. Further, in each of the following drawings, the Z axis is taken in the direction to the subject (the optical axis direction of the image stabilization lens) in the optical axis direction of the lens barrel, and in the vertical direction (pitch direction) in the plane perpendicular to the Z axis. A description will be given by taking the Y axis and taking the X axis in the horizontal direction (yaw direction).

  FIG. 1 is a schematic cross-sectional view showing the configuration of the lens barrel 1. The lens barrel 1 has a first holder 2 and a second holder 3 having a substantially cylindrical shape. Further, the lens barrel 1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. And an image pickup device 4.

  The first holder 2 is a fixed lens barrel positioned in the front portion of the lens barrel 1 in the Z-axis direction, and includes a first group lens L1 and a second group lens L2. The first group lens L1 is an optical element held by the first fixed frame 5 and is positioned at the front portion of the lens barrel 1 and is screwed to the first holder 2. The second group lens L2 is an optical element that is held by the first moving frame 6 inside the first holder 2 and performs a zooming operation by moving in the optical axis direction. The first holder 2 has a zoom motor (not shown) for driving the first moving frame 6 and a first guide bar and a second guide bar (not shown) extending in the Z-axis direction.

  The zoom motor (not shown) has a lead screw coaxial with the rotating rotor, and rotates the lead screw meshed with the rack attached to the first moving frame 6 by the rotor, so that the second group lens L2 is optically driven. Move in the axial direction. The first guide bar (not shown) supports the first moving frame 6 so as to be movable in the Z-axis direction, while the second guide bar is engaged with the first moving frame 6 to engage the first moving frame 6. The circumferential rotation in the first holder 2 is restricted.

  Further, the first holder 2 detects that the second group lens L2 is at the reference position by optically detecting the movement of the light shielding portion formed in the first moving frame 6 in the optical axis direction. A photo interrupter (not shown) used as a zoom reset switch is provided.

  The second holder 3 is a fixed barrel that is connected to the first holder 2 with screws and is positioned at the rear of the lens barrel 1, and includes a third group lens L 3, a fourth group lens L 4, and an aperture device 7. And the image sensor 4. The third group lens L3 is held by a shift unit 8 as a drive unit of an image shake correction apparatus installed inside the second holder 3, and performs image shake correction by moving in a plane perpendicular to the optical axis. This is an optical element (image blur correction element). The fourth group lens L4 is an optical which is held by a second moving frame 9 inside the second holder 3 and moves in the optical axis direction to perform a focusing operation while facing an imaging surface of the imaging element 4 described later. It is an element.

  The second holder 3 has a focus motor (not shown) for driving the second moving frame 9, and a third guide bar and a fourth guide bar (not shown) extending in the Z-axis direction. The focus motor has a lead screw coaxial with the rotating rotor, and rotates the lead screw meshed with the rack attached to the second moving frame 9 by the rotor, thereby moving the fourth group lens L4 in the optical axis direction. Move.

  The third guide bar (not shown) supports the second moving frame 9 so as to be movable in the Z-axis direction, while the fourth guide bar 10 is engaged with the second moving frame 9 to engage the second moving frame 9. The rotation in the circumferential direction within the second holder 3 is restricted. Further, although not shown, the second holder 3 optically detects the movement of the light shielding portion formed in the second moving frame 9 in the optical axis direction, so that the fourth group lens L4 is brought to the reference position. A photo interrupter used as a focus reset switch for detecting the presence is provided.

  The aperture device 7 is a device that changes the aperture diameter of the optical system by installing an aperture blade between the front lens constituting the second group lens L2 and the rear lens constituting the third group lens L3. is there. In the present embodiment, the aperture diameter is changed by moving two diaphragm blades in opposite directions with one motor. The second holder 3 includes a holding structure that holds the image sensor 4. The imaging device 4 is an imaging unit that photoelectrically converts a subject image formed by the lenses L1 to L4 of the first to fourth groups.

  As this image sensor 4, a CMOS (Complementary Metal Oxide Semiconductor) image sensor is employed in the present embodiment. As the image pickup device 4, other types of image pickup devices such as a CCD (Charge Coupled Device) image sensor can be used. Although not shown, the imaging element 4 is connected to a main board in the imaging apparatus having the lens barrel 1 through various wirings.

(Image shake correction device)
Next, the shift unit 8 as an image shake correction apparatus according to the present embodiment will be described. 2 and 3 are exploded perspective views showing components of the shift unit 8 when viewed from the subject side and when viewed from the image plane side. As described above, the shift unit 8 is positioned inside the second holder 3 and is installed with screws.

  The shift unit 8 includes a shift base 11 as a fixed member, a pitch guide base 12 as a guide member, and a shift movement frame 13 as a movable member. The shift base 11 is a main body of the shift unit 8 and guides a holding portion that holds a coil of an actuator, which will be described later, and three first rolling balls 14 that allow the pitch guide base 12 to move only in the yaw direction. And a first V groove 15 extending in the yaw direction (x direction).

  The pitch guide base 12 is movable with respect to the shift base 11 in a plane perpendicular to the optical axis, and has a role of guiding the shift movement frame 13 so as not to rotate in a plane perpendicular to the optical axis. The pitch guide base 12 has a second V groove 16 (together with the first V groove 15 and the first rolling ball 14 extending in the yaw direction for guiding (guiding) the first rolling ball 14 on a surface facing the shift base 11. And a first flat groove 31 (FIG. 3).

  Further, a third V-groove extending in the pitch direction (y direction) for guiding the three second rolling balls 17 that allows the shift movement frame 13 to move only in the pitch direction is provided on the surface facing the shift movement frame 13. 18 (a second rolling ball 17 is sandwiched together with a fourth V groove 19 described later).

  The pitch guide base 12 is insert-molded with a magnet 20 (FIGS. 2 and 3) that serves both for driving and for position detection. Since the magnet 20 is insert-molded in the pitch guide base 12, the relative positional relationship with the pitch guide base 12 does not shift.

  The shift moving frame 13 holds a third lens unit L3 that is an image shake correction lens (image shake correction element, image stabilization optical element), and is a plane perpendicular to the optical axis of the image shake correction lens in order to correct camera shake. This is a movable member that is movable with respect to the shift base 11. And it has the holding | maintenance part holding the coil of the actuator mentioned later, and the 4th V groove | channel 19 extended in the pitch direction (y direction) which guides the 2nd rolling ball 17 to the surface facing the pitch guide base 12. FIG.

  In the present embodiment, the first guide portion is composed of one set of V grooves (first V groove 15 and second V groove 16), and is composed of one set of V grooves (third V groove 18 and fourth V groove 19). Three second guide portions are provided corresponding to the three rolling balls, respectively.

  Here, the coil spring 21 shown in FIG. 2 is configured so that one is hooked to the shift base 11 and the other is hooked to the shift moving frame 13, and the shift base 11 and the shift moving frame are used with the pitch guide base 12 as an intermediate member. 13 has a role of generating a force to be sandwiched between the two. The force for bringing the first rolling ball 14 into contact with the first V groove 15 and the second V groove 16 provided in the shift base 11 and the pitch guide base 12 is a spring biasing force by the coil spring 21.

  Similarly, the force for bringing the second rolling ball 16 into contact with the third V groove 18 and the fourth V groove 19 provided in the pitch guide base 12 and the shift moving frame 13 is also a spring biasing force by the coil spring 21.

  The yaw direction drive coil 22 (FIGS. 2 and 3) is bonded and fixed to the shift base 11 with an adhesive (not shown). The pitch direction drive coil 23 (FIGS. 2 and 3) is bonded and fixed to the shift movement frame 13 with an adhesive (not shown). And both the yaw direction drive coil 22 and the pitch direction drive coil 23 are disposed at positions facing the magnet 20 in a state of being inclined by 45 degrees, like the magnet 20 described above.

  The magnet 20 is two-pole magnetized in the L3a direction (FIGS. 2 and 3) with respect to the surface facing the yaw direction drive coil 22, and also in the L3a direction with respect to the surface facing the pitch direction drive coil 23. It is configured to be dipole magnetized. The direction of L3a shown in FIGS. 2 and 3 is a direction having an inclination of 45 degrees with respect to both the pitch direction and the yaw direction.

  Here, when the yaw direction drive coil 22 is energized, a drive force in the L3a direction is generated between the yaw direction drive coil 22 and the magnet 20. This driving force is controlled by the magnitude and direction (polarity) of the current supplied to the yaw direction driving coil 22. Since the yaw direction drive coil 22 is bonded and fixed to the shift base 11 as a fixing member, the drive force acts as a force for moving the pitch guide base 12.

  At this time, the direction of the driving force is the direction of L3a, but as described above, the pitch guide base 12 is configured to be movable only in the yaw direction (x direction) with respect to the shift base 11. Therefore, the component force in the yaw direction of the L3a direction driving force acts on the pitch guide base 12 to drive only in the yaw direction (x direction).

  In addition, when the pitch direction drive coil 23 is energized, a driving force in the L3a direction is generated between the pitch direction drive coil 23 and the magnet 20. This driving force is controlled by the magnitude and direction (polarity) of the current supplied to the pitch direction driving coil 23. The pitch direction drive coil 23 is fixed to the shift moving frame 13 and the position of the pitch guide base 12 is controlled by energizing the yaw direction drive coil 20 as described above. It works as a force to move the moving frame 13.

  At this time, the driving force direction is the direction of L3a, but as described above, the shift moving frame 13 is configured to be movable only in the pitch direction (y direction) with respect to the pitch guide base 12. . Therefore, the component force in the pitch direction of the driving force in the L3a direction acts on the shift moving frame 13 to drive only in the pitch direction (y direction). That is, the shift moving frame 13 is configured to be freely movable in the pitch direction and the yaw direction with respect to the shift base 11.

  The yaw direction position detecting sensor 24 shown in FIG. 2 is fixedly arranged inside the yaw direction driving coil 22, and the pitch direction position detecting sensor 25 shown in FIG. 3 is fixedly arranged inside the pitch direction driving coil 23. . Both the yaw direction position detection sensor 24 and the pitch direction position detection sensor 25 use, for example, Hall elements. As described above, when the position detection sensors 24 and 25 in the yaw direction and the pitch direction are arranged, and the position displacement of the magnet 20 with respect to the position detection sensor occurs, the magnetic flux changes according to the position displacement. And according to the magnitude | size of the magnetic flux from the magnet 20, the electric signal of a position detection sensor is output and position detection becomes possible.

(Operation of image blur correction device)
Next, the operation of the image shake correction apparatus according to the present embodiment will be described.

1) Normal State FIG. 4 shows a normal state in which the first rolling ball 14 does not ride on the first V groove 15 of the shift base 11 and the second V groove 16 of the pitch guide base 12. Fig.4 (a) is a front view and FIG.4 (b) has shown the AA cross section.

  In the present embodiment, a set of V grooves (first V grooves 15, as a first guide portion) in the pitch direction (y direction) orthogonal to the yaw direction of the first rolling ball 14 moving in the yaw direction (x direction). The following members are provided as members for restricting disengagement from the second V groove 16). That is, a first stopper 26 for restricting the first rolling ball 14 from moving in the pitch direction is provided around the second V groove 16 of the pitch guide base 12, and around the first V groove 15 of the shift base 11, A first stopper facing wall 27 is provided at a position facing the stopper 26.

  FIG. 5 shows a normal state in which the second rolling ball 17 does not ride on the third V groove 18 of the pitch guide base 12 and the fourth V groove 19 of the shift moving frame 13. Fig.5 (a) is a front view and FIG.5 (b) has shown the BB cross section.

  In the present embodiment, a set of V grooves (third V grooves 18, as second guide portions) in the yaw direction (x direction) perpendicular to the pitch direction of the second rolling balls 17 moving in the pitch direction (y direction). The following members are provided as members for restricting disengagement from the fourth V groove 19). That is, the second stopper 28 for restricting the second rolling ball 17 from moving in the yaw direction is provided around the fourth V groove 19 of the shift moving frame 13, and around the third V groove 18 of the pitch guide base 12. A second stopper facing wall 29 is provided at a position facing the second stopper 28.

  Here, in the present embodiment, the surface on the diaphragm device 7 side of the surface facing the diaphragm device 7 and the shift movement frame 13 is the fixed wall 30. The fixed wall 30 shifts when the first rolling ball 14 and the second rolling ball 17 biased by the biasing force in the optical axis direction of the coil spring 21 ride on the V-groove when receiving a drop impact. The moving frame 13 serves to avoid contact with the diaphragm device 7.

  The distance between the shift frame 13 and the fixed wall 30 is D, the angle between the first V groove 15 and the second V groove 16 is θ1, and the distance d1 between the first stopper 26 and the first stopper facing wall 27 is d1. Note that the distance d1 is the same distance when the first stopper 26 and the first stopper facing wall 27 are provided in the pitch direction (y direction) in the reverse direction.

  The angle between the third V-groove 18 and the fourth V-groove 19 is θ2, and the interval d2 between the second stopper 28 and the second stopper facing wall 29 is d2. Note that the distance d2 is the same even when the second stopper 28 and the second stopper facing wall 29 are provided in the yaw direction (x direction) in reverse.

2) At the time of a drop impact Here, FIG. 6 shows a state when the shift unit 8 receives a drop impact and the pitch guide base 12 moves Y1 in the pitch direction (y direction). Fig.6 (a) is a front view and FIG.6 (b) has shown the AA cross section. Since the angle of the first V-groove 15 and the second V-groove 16 is θ1, when the pitch guide base 12 moves Y1 in the pitch direction, the first rolling ball 14 is Z1 = Y1 / tan (θ1 / 2) in the optical axis direction. Approaches the fixed wall 30.

  At this time, when the distance D between the shift moving frame 13 and the fixed wall 30 becomes zero and comes into contact, the contact pressure at the contact portion increases, and the shift unit 8 bites and becomes inoperative. Therefore, if the first stopper 26 and the first stopper facing wall 27 come into contact with each other before the shift moving frame 13 and the fixed wall 30 come into contact with each other, the biting can be prevented. As a condition, when d1−Y1 = 0, D−Z1> 0.

  FIG. 7 shows a state when the shift unit 8 receives a drop impact and the shift moving frame 13 moves X2 in the yaw direction. Fig.7 (a) is a front view and FIG.7 (b) has shown the BB cross section. Since the angle of the third V-groove 18 and the fourth V-groove 19 is θ2, when the shift movement frame 13 moves X2 in the yaw direction, the second rolling ball 17 is Z2 = X2 / tan (θ2 / 2) in the optical axis direction. Approaches the fixed wall 30.

  At this time, when the distance D between the shift moving frame 13 and the fixed wall 30 becomes zero and comes into contact, the contact pressure at the contact portion increases, and the shift unit 8 bites and becomes inoperative. Therefore, if the second stopper 28 and the second stopper facing wall 29 come into contact with each other before the shift moving frame 13 and the fixed wall 30 come into contact with each other, the biting can be prevented. As a condition, when d2−X2 = 0, D−Z2> 0.

(Conditions for preventing biting in this embodiment)
From the above, when the angle formed by the first V groove 15 and the second V groove 16 is the same angle θ1, and the angle formed by the third V groove 18 and the fourth V groove 19 is the same angle θ2, considering both the pitch direction and the yaw direction, The following conditions prevent biting.

When d1-Y1 = 0 and d2-X2 = 0, D- (Z1 + Z2)> 0
This conditional expression can also be expressed as follows.

  D> (d1 / tan (θ1 / 2) + d2 / tan (θ2 / 2)).

<< Second Embodiment >>
Next, an image shake correction apparatus according to the second embodiment of the present embodiment will be described. In the first embodiment, each pair of V grooves (first V groove 15 and second V groove 16) has the same angle θ1, and another set of V grooves (third V groove 18 and fourth V groove 19). ) Are the same angle θ2, but the present embodiment is different from the first embodiment only in that each has a different angle. That is, in the present embodiment, the angle θ1 of the first V groove 15 and the angle θ3 of the second V groove 16 are different (θ1> θ3), and the angle θ2 of the third V groove 18 and the angle θ4 of the fourth V groove 19 are different (θ2). > Θ4). Hereinafter, the operation of the image blur correction apparatus according to the present embodiment will be described.

1) Normal State FIG. 8 shows a normal state in which the first rolling ball 14 is not riding on the first V groove 15 and the second V groove 16. Fig.8 (a) is a front view and FIG.8 (b) has shown CC cross section. Since the part number is the same as that of the first embodiment, the description thereof is omitted. The distance between the shift frame 13 and the fixed wall 30 is D, the angle of the first V-groove 15 is θ1, the angle of the second V-groove 16 is θ3, and the distance between the first stopper 26 and the first stopper facing wall 27 is d1, θ1> Let θ3.

  FIG. 9 shows a normal state in which the second rolling ball 17 does not ride on the third V groove 18 and the fourth V groove 19. Fig.9 (a) is a front view and FIG.9 (b) has shown DD cross section. The angle of the third V groove 18 is θ2, the angle of the fourth V groove 19 is θ4, the distance between the second stopper 28 and the second stopper facing wall 29 is d2, and θ2> θ4.

2) At the time of a drop impact FIG. 10 shows a state when the shift unit 8 receives a drop impact and the pitch guide base 12 moves Y1 in the pitch direction (y direction). Fig.10 (a) is a front view and FIG.10 (b) has shown CC cross section. Regarding the angle θ1 of the first V-groove 15 and the angle θ3 of the second V-groove 16, θ1> θ3. Therefore, when the pitch guide base 12 moves Y1 in the pitch direction, the amount of movement in the optical axis direction of the second V groove 16 with a steep slope becomes larger than that of the first V groove 15, and Z3 = Y1 / in the optical axis direction. The first rolling ball 14 approaches the fixed wall 30 by tan (θ3 / 2).

  At this time, when the distance D between the shift moving frame 13 and the fixed wall 30 becomes zero and comes into contact, the contact pressure at the contact portion increases, and the shift unit 8 bites and becomes inoperative. Therefore, if the first stopper 26 and the first stopper facing wall 27 come into contact with each other before the shift moving frame 13 and the fixed wall 30 come into contact with each other, the biting can be prevented. As a condition, when d1−Y1 = 0, D−Z3> 0.

  FIG. 11 shows a state when the shift unit 8 receives a drop impact and the shift moving frame 13 moves X2 in the yaw direction (x direction). Fig.11 (a) is a front view, FIG.11 (b) has shown DD cross section. With respect to the angle θ2 of the third V groove 18 and the angle θ4 of the fourth V groove 19, θ2> θ4. Therefore, when the shift frame 13 moves X2 in the yaw direction, the movement amount in the optical axis direction of the fourth V groove 19 with a steep slope becomes larger than that in the third V groove 18, and Z4 = X2 / in the optical axis direction. The second rolling ball 17 approaches the fixed wall 30 by tan (θ4 / 2).

  At this time, when the distance D between the shift moving frame 13 and the fixed wall 30 becomes zero and comes into contact, the contact pressure at the contact portion increases, and the shift unit 8 bites and becomes inoperative. Therefore, if the second stopper 28 and the second stopper facing wall 29 come into contact with each other before the shift moving frame 13 and the fixed wall 30 come into contact with each other, the biting can be prevented. As a condition, when d2−X2 = 0, D−Z4> 0.

(Conditions for preventing biting in this embodiment)
From the above, when the angle θ1 of the first V groove 15 and the angle θ3 of the second V groove 16 are different and θ1> θ3, the angle θ2 of the third V groove 18 and the angle θ4 of the fourth V groove 19 are different, and θ2> θ4, the following bites: This is a condition to prevent

When d1-Y1 = 0 and d2-X2 = 0, D- (Z3 + Z4)> 0
This conditional expression can also be expressed as follows.

  D> (d1 / tan (θ3 / 2) + d2 / tan (θ4 / 2)).

(Modification)
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

(Modification 1)
In the above-described embodiment, the fixed wall 30 is provided. However, the present invention is not limited to this, and the first stopper and the first stopper facing wall, and the second stopper and the second stopper facing wall are provided for fixing. It can also be set as the structure which eliminates the wall 30. FIG.

(Modification 2)
In the above-described embodiment, the first guide portion and the second guide portion are shown in which the moving direction cross section is configured by the V-groove, but the present invention is not limited to this, and the moving direction cross section is semicircular, anti-elliptical, etc. It may be constituted by a groove having a shape of

11 .... Shift base, 12 .... Pitch guide base, 13 .... Shift movement frame, 14 .... First rolling ball, 15 .... First V groove, 16 .... Second V groove, 17 .... Second rolling Ball, 18 ·· 3rd V groove, 19 ·· 4V groove, 26 ·· First stopper, 27 ·· First stopper facing wall, 28 ·· Second stopper, 29 ·· Second stopper facing wall

Claims (11)

A fixing member;
A movable member that holds an image shake correction element and is movable with respect to the fixed member in a plane perpendicular to the optical axis of the image shake correction element;
A guide member that is movable in a plane perpendicular to the optical axis with respect to the fixed member, and that guides the movable member not to rotate in a plane perpendicular to the optical axis;
A first rolling ball provided between the fixing member and the guide member;
A second rolling ball provided between the guide member and the movable member;
A first guide part for sandwiching the first rolling ball and guiding it in a first direction;
A second guide portion that sandwiches the second rolling ball and guides the second rolling ball in a second direction different from the first direction;
An image blur correction apparatus that drives the movable member in a direction perpendicular to the optical axis with respect to the fixed member,
As a member for restricting disengagement of the first rolling ball from the first guide portion in a direction orthogonal to the first direction, one of the opposing surfaces of the fixing member and the guide member is first. 1 stopper, the other has a first stopper facing wall, and
Of the opposing surfaces of the guide member and the movable member, the member for restricting the second rolling ball from coming off from the second guide portion in the direction (x) orthogonal to the second direction, An image blur correction apparatus having a second stopper on one side and a second stopper facing wall on the other side.   2. The image blur correction apparatus according to claim 1, wherein each of the first guide unit and the second guide unit includes a pair of V grooves.   3. The image blur correction device according to claim 2, wherein three each of the first rolling ball and the second rolling ball are provided, and each of the set of three V grooves is provided.   The image blur correction apparatus according to claim 1, further comprising a fixed wall on a subject side of the movable member. A fixed wall is provided on the subject side of the movable member,
The same angle of one set of V grooves of the first guide part is θ1,
The same angle of the pair of V grooves of the second guide portion is θ2,
The distance between the first stopper and the first stopper facing wall is d1,
The distance between the second stopper and the second stopper facing wall is d2,
When the distance between the movable member and the fixed wall is D,
D> (d1 / tan (θ1 / 2) + d2 / tan (θ2 / 2))
The image blur correction apparatus according to claim 2, wherein the following conditional expression is satisfied. A fixed wall is provided on the subject side of the movable member,
Different angles of the set of V grooves of the first guide part are θ1, θ3,
Different angles of one set of V grooves of the second guide portion are θ2, θ4,
The distance between the first stopper and the first stopper facing wall is d1,
The distance between the second stopper and the second stopper facing wall is d2,
When the distance between the movable member and the fixed wall is D,
θ1> θ3, θ2> θ4
And,
D> (d1 / tan (θ3 / 2) + d2 / tan (θ4 / 2))
The image blur correction apparatus according to claim 2, wherein the following conditional expression is satisfied.   The fixed member has a first drive coil for driving in the first direction, the movable member has a second drive coil for driving in the second direction, and the guide member has a magnet. Item 7. The image blur correction device according to any one of Items 1 to 6.   A first position detecting sensor for detecting a position in the first direction on the fixed member; and a second position detecting sensor for detecting a position in the second direction on the movable member. The image blur correction apparatus according to claim 1, wherein the image blur correction apparatus is characterized in that:   9. The image blur correction apparatus according to claim 8, wherein the first and second position detection sensors are Hall elements. The image blur correction element is an image blur correction lens;
A lens barrel comprising the image blur correction device according to claim 1.   An optical apparatus comprising the image blur correction device according to claim 1.