JP5518219B2 - Image shake correction apparatus, imaging apparatus, and optical apparatus - Google Patents

Description

  The present invention relates to an image shake correction apparatus for correcting image shake, an imaging apparatus including the image shake correction apparatus, and an optical apparatus.

  Conventionally, in order to correct image blur due to camera shake or the like that is likely to occur in hand-held shooting, an image to be corrected by shifting the image blur correction lens included in the imaging lens within a plane perpendicular to the optical axis. A shake correction device (optical image stabilization unit) is known.

  As such an image blur correction apparatus, there is known an apparatus in which a correction lens is shifted in a first direction or a second direction (a direction perpendicular to the first direction) without rotating around an optical axis. It has been.

  In Patent Document 1, as shown in FIG. 14, a lens holder 102 that holds a correction lens 101 is received by three balls 103, 104, and 105. The lens holder 102 is moved in a plane orthogonal to the optical axis by being sandwiched between the base member 109 by three springs 106, 107, and 108 arranged on the outside thereof.

  Further, as shown in FIG. 15, a lens holder 102 and a drive member 110 are provided between a base member 109 and a base member 111, and at least one of the openings at both ends of these base members 109 and 111 is provided with a protective lens 112, 113 is fixed. Therefore, the lens holder 102 and the drive member 110 are formed into a casing by the base members 109 and 111 and the protective lenses 112 and 113. For this reason, the lens holder 102 and the drive member 110 are not exposed to the outside, and the workability such as incorporation of the image blur correction device into the lens barrel is improved.

JP-A-10-90744

  However, in the configuration in which the three springs 106 to 108 are hung on the lens holder 102 and the base member 109 as disclosed in Patent Document 1, a space for three springs is required. Therefore, the lens unit including the lens holder 102 becomes large, which is one of the factors that increase the size of the entire camera.

  In addition, when the three springs are hooked as disclosed in Patent Document 1, even if one of the three springs is to be excluded, the triangular spring formed by the receiving portions of the three balls is used. Force is applied to the outside. For this reason, the balance of force was lost and one of the two surfaces was lifted, and the mechanism itself was not established.

(Object of invention)
An object of the present invention is to provide an image blur correction apparatus, an imaging apparatus, and an optical apparatus that can reduce the number of parts and improve the assemblability , and can reduce rolling during image blur correction.

To achieve the above object, the present invention includes a base member and said base member relative to the holding member relatively movably held in a plane perpendicular to the optical axis of the optical system of the image-shake correcting lenses And a hook portion formed at one end of the holding member, the other end of which is held by the base member and the holding member, and either a coil or a magnet is the holding member. attached to, and driving means for moving the holding member in a second direction perpendicular to the first direction and the first direction, by the biasing force of the two springs, between the base member and the holding member has a three balls sandwiched, to, when the center of the image shake correcting lens held by the holding member coincides with the optical axis, one said image of said coil or said magnet For shake correction The center of gravity of the holding member in a state in which lens and is attached is in the plane, located inside the triangle formed by the three balls, one of the two springs, the hook portion of one of the spring And forming the holding member so that the line segment connecting the locking portion of the holding member and the hook portion of the other spring and the locking portion of the holding member straddles the two sides of the triangle, the three balls and the two springs are arranged, said Ri plane including the hook portion of the hand of the spring parallel to name and the first direction, the plane including the hook portion of the other spring the The hook portions of the two springs are respectively locked to the holding member so as to be parallel to the second direction.

  Similarly, in order to achieve the above object, the present invention is an imaging apparatus or an optical apparatus that includes the image blur correction apparatus of the present invention.

According to the present invention, it is possible to provide an image blur correction device, an imaging device, or an optical device capable of reducing the number of parts and improving the assemblability and relaxing the rolling at the time of image blur correction.

It is a perspective view which shows the camera which concerns on one Example of this invention. It is a disassembled perspective view which shows the whole lens-barrel of the camera which concerns on one Example of this invention. It is a disassembled perspective view which shows the 2nd group barrel of the camera which concerns on one Example of this invention. It is a top view which shows the image blur correction apparatus with which the camera which concerns on one Example of this invention is equipped. It is a disassembled perspective view which shows the shutter & ND mechanism of the camera which concerns on one Example of this invention. It is a figure which shows the force (X direction) which acts on the lens holder which concerns on one Example of this invention. It is an enlarged view which shows the frictional force which acts on the hook latching | locking part of the lens holder which concerns on one Example of this invention. It is a figure which shows the force which acts on the lens holder which concerns on one Example of this invention (rotation direction). It is a figure which shows the force which acts on the lens holder which concerns on one Example of this invention (Y direction). It is a figure which shows the force which acts on the lens holder which concerns on one Example of this invention (A direction). It is a figure which shows the force which acts on the lens holder which concerns on one Example of this invention (B direction). It is a top view which shows the lens holder and base member of the image blurring correction apparatus with which the conventional camera is equipped. It is a figure which shows the force which acts on the conventional lens holder (X direction). It is a top view which shows the image blur correction apparatus with which the conventional camera is equipped. It is sectional drawing which shows the image blurring correction apparatus with which the conventional camera is equipped.

  The best mode for carrying out the present invention is as shown in the following examples.

  FIG. 1 is a perspective view showing a camera which is an image pickup apparatus including an image shake correction apparatus according to an embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a camera body. A lens barrel 2 and a finder window 5 capable of changing the focal length of the photographing lens are provided on the front surface of the camera body 1. A lens barrier device 3 (FIG. 1 is in an open state) is provided on the front surface of the lens barrel 2 to open and close the optical path of the photographic lens in accordance with turning on / off of the camera.

  On the upper surface of the camera body 1, there is provided a light emission window portion 4 constituting a strobe device that irradiates the subject with illumination light. Furthermore, a release button 6 is provided on the upper surface of the camera body 1 for starting a shooting preparation operation (focus adjustment operation and photometry operation) and a shooting operation (exposure to an image sensor such as a film or a CCD).

  FIG. 1 is a typical schematic diagram of a camera, and the present invention is not limited to the above configuration.

  FIG. 2 is an exploded perspective view of the lens barrel 2.

  In FIG. 2, reference numeral 7 denotes a first group barrel that holds the first group lens, and includes the lens barrier device 3 described above. Reference numeral 8 denotes a second group barrel that holds the second group lens, and includes an image blur correction device and a shutter and diaphragm mechanism, which will be described later. Reference numeral 9 denotes a moving cam ring having a drive cam for driving the first group barrel 7 and the second group barrel 8 on its inner peripheral portion, and has a gear portion to which power is transmitted from a barrel drive motor (not shown). Reference numeral 10 denotes a rectilinear cylinder rotatably held by the movable cam ring 9, and restricts the first group barrel 7 and the second group barrel 8 to travel straight. Reference numeral 11 denotes a fixed cylinder having a driving cam for driving the moving cam ring 9 on the inner peripheral portion. Reference numeral 12 denotes a third lens barrel that holds the third lens group, and reference numeral 13 denotes a base member that includes an image sensor.

  The configuration of the lens barrel 2 is not limited to the above configuration as long as it satisfies the features of the present invention.

  Next, the configuration of the second group barrel 8 having an image blur correction device and a shutter & aperture mechanism will be described with reference to FIGS. 3, 4 and 5. FIG. 3 is an exploded perspective view of the second group barrel 8. FIG. 4 is an exploded perspective view of the second group barrel 8 as viewed from the subject side (with the sensor holder, the second group FPC, and the second group cover to be described later removed). 5 is an exploded perspective view of the second group barrel 8 as viewed from the opposite side of FIG.

  3 to 5, reference numeral 28 denotes a second group base member which is a base of the second group lens barrel 8, and includes a relief shape portion 28a of a focus feed screw (not shown), a relief shape portion 28b of a focus guide bar, and a hook described later. 28c. The lens barrel 2 is reduced in size by shortening the interval between the lens group barrels when retracted, but the focus feed screw and the focus guide bar (not shown) protrude in the optical axis direction. The base member 28 is penetrated. Then, the light beam that does not pass through the lens passes through the penetrating portion and enters the image sensor, causing light leakage. For this reason, a bag shape (see FIG. 4) is formed as in the relief shape portions 28a and 28b so as to prevent light leakage as much as possible.

  Reference numeral 21 denotes a second group lens holder that holds a second group lens group (hereinafter referred to as a correction lens) 26, and the correction lens 26 is caulked. Magnets 22A and 22B are integrally held by the second group lens holder 21. The subscripts A and B in the code correspond to the A direction and the B direction in FIG. The second group lens holder 21 has hook engaging portions 21a (see FIG. 3) at two locations, and a spring 23 (coil spring) for applying a tensile force is applied to the hook engaging portion 21a.

  Reference numeral 27 denotes a fixed diaphragm that cuts harmful light, and is fixed to the second group lens holder 21 by a hook 21a. Reference numerals 24 </ b> A and 24 </ b> B denote coil units each including a coil and a bobbin, and are bonded and fixed to a recess of the second group base member 28. The power supply to the coil is a 2-group FPC (flexible printed circuit board) to be described later with respect to the metal pins 24A-a and 24B-a (see FIGS. 3 and 4) embedded in the bobbin and electrically connected to the coil. ).

  The other ends of the two springs 23 hung on the second group lens holder 21 are hung on hook engaging portions 28c (see FIG. 3) of the second group base member 28, and the second group base member 28 and the second group lens holder Three non-magnetic balls 25 (see FIGS. 3 and 4) are sandwiched between the two. The second group lens holder 21 is pressed toward the second group base member 28 via the ball 25. However, since the ball 25 is interposed, it is possible to move freely in a plane perpendicular to the optical axis. By moving the second group lens holder 21 in a plane, image blur on the image sensor is suppressed and correction is performed.

  Reference numeral 18 denotes an actuator for driving the shutter blades, and reference numeral 19 denotes an actuator for driving the ND filter. Both are actuators of a two-point switching system in which the arm stop position is switched by forward / reverse rotation of the energization direction. Reference numeral 16 denotes a two-group FPC whose overall shape is a semicircular arc shape (see FIG. 3). The actuators 18 and 19 are soldered to both ends of the semicircular arc shape, and lands 16a for soldering to the coil unit are provided in the middle. In addition, Hall elements 17A and 17B for detecting a magnetic field are mounted on the back side.

  The magnets 22A and 22B held by the second group lens holder 21 are magnetized in the direction as shown in FIG. The Hall elements 17A and 17B detect the movement of the second group lens holder 21 in the A direction and the B direction as changes in the magnetic field, and the movement amount is calculated based on the change amount. Since the positional accuracy of the magnets 22A and 22B and the Hall elements 17A and 17B is important, the Hall elements 22A and 22B are press-fitted into the sensor holder 20 and positioned with high accuracy.

  The second group FPC 16 as described above is fixed by engagement between the positioning hole 16b and the positioning protrusion 20a (see FIG. 3) of the sensor holder 20, and the sensor holder 20 is attached to the second group base member 28. Then, by fixing the second group cover 15 to the second group base member 28 with the screw 14 and the outer peripheral hook, the sensor holder 20 and the actuators 18 and 19 are fixed to the second group base member 28.

  In FIG. 5, reference numerals 29 and 30 denote shutter blades that are driven by the drive arm of the actuator 18. Reference numeral 31 denotes a partition plate, and 32 denotes an ND filter that restricts the amount of light. The ND filter is driven by the actuator 19 and repeatedly enters and leaves the optical path. Reference numeral 33 denotes a shutter cover, which is fixed to the second group base member 28 with a hook and protects the shutter blades 29 and 30 and the ND filter 32.

  Next, the stability of the second group lens holder 21 holding the correction lens 26 with respect to the second group base member 28 will be described with reference to FIG.

  Since the second group lens holder 21 is formed of a mold member and includes the correction lens 26 and the magnets 22A and 22B as described above, its own weight is mainly controlled by the weight of the correction lens 26 and the magnets 22A and 22B. ing. At the start of driving for image blur correction, the center of the correction lens 26 coincides with the optical axis of the other photographing lens optical system by the driving force of the magnets 22A and 22B and the coils 24A and 24B against the weight. Lift the second group lens holder 21. The state of FIG. 4 represents a state in which the second group lens holder 21 is lifted so that the center of the correction lens 26 coincides with the optical axis of another photographing optical system. At this time, the center of gravity of the second group lens holder 21 to which the magnets 22A and 22B are attached and holds the correction lens 26 is the position shown in FIG. 4 (the position indicated by “× centroid”). Then, the three balls 25 are arranged so that the triangle formed by the three balls 25 receiving the second group lens holder 21 (shown by a broken line because it is on the back surface) includes the center of gravity inside. The group lens holder 21 can be held stably. For example, if the triangle formed by the three balls 25 is arranged so as not to include the center of gravity, the second group lens holder 21 is tilted toward the center of gravity and cannot move in a plane orthogonal to the optical axis.

  As described above, two springs 23 (see FIGS. 3 and 4) are hooked between the second group lens holder 21 and the second group base member 28 in parallel with the optical axis direction. In this manner, the three balls 25 are held between the two group lens holders 21 and the second group base member 28 by applying the springs 23 so as to press each other. The line segment formed by the two hook engaging portions 21a on which the two springs 23 are hooked to the second group lens holder 21 straddles two sides of the triangle formed by the three balls 25 (see broken lines). Like that.

  In the case of the present embodiment, the second group lens holder 21 has a symmetrical shape, and the magnets 22A and 22B are also symmetrically arranged, so that the line segment formed by the two hook locking portions 21a has two triangular shapes. It is desirable to straddle the sides and equidistant from the axis of symmetry. That is, the most stable condition is that the point where the two spring forces are combined is on the symmetry axis inside the triangle. In other words, the two springs 23 to be hung on the second group lens holder 21 have a degree of freedom to be hung on the above-mentioned triangle in any way, but in order to ensure the stability as the image blur correction device, the two springs 23 are evenly spaced from the symmetry axis. It is desirable to arrange.

  Next, a specific method of hooking the two springs 23 to prevent rolling will be described with reference to FIGS.

  As shown in FIG. 6, the rolling is a force that attempts to rotate with respect to the center of gravity of the second group lens holder 21 when the driving force for image blur correction acts as F as a resultant force. In this case, the second group lens holder 21 tries to rotate counterclockwise with respect to the center of gravity by the component force F1 of F. Since this rolling hinders image blur correction performance, conventionally, three springs 37 are hung between the base member 34 and the lens holder 35 as shown in FIG. The central spring 37 not only stabilizes the spring force applied to the lens holder 35 but also plays a role of relaxing rolling.

  In the present embodiment, there is no spring corresponding to the above-described central spring, and only two springs 23 are provided, and therefore, this is affected by this rolling. However, the plane formed by the hook portion 23a, which is one end portion of the two springs 23, is parallel to the drive directions A and B for image blur correction. Specifically, in FIG. 4 and FIG. 6 described later, the plane formed by the hook portion 23a of the right spring 23 is parallel to the A axis direction, and the plane formed by the hook portion 23a of the left spring 23 is parallel to the B axis direction. Do each. This solves the influence on rolling (details will be described later).

  FIG. 12 shows a conventional example in which three springs 37 are hung as described above. Three balls 36 are disposed between the base member 34 and the lens holder 35, and the hook portions 37 a of the base member 34 and the lens holder 35 are hooked on the hook portions of the three springs 37. The plane perpendicular to the axis can move smoothly.

  The springs 37 are hung so that the two left and right springs 37 are parallel to the Y axis, and the central spring 37 is parallel to the X axis. Both have an inclination of 45 ° with respect to the driving directions A and B for image blur correction. FIG. 13 shows a state in which the lens holder 35 on which the three springs 37 are hung is slightly moved along the X axis in the image blur correction driving, and the above-described rolling is performed by driving along the X axis. The force works counterclockwise with respect to the center of gravity. In FIG. 13, f is a driving force (combined force) f1 and f2 for image blur correction, and the component forces thereof.

  In FIG. 13, the reaction force r against the driving force f for image blur correction is applied to the lens holder 35 by the three springs 37, and the lens holder 35 with respect to the center of gravity for the two left and right springs 37. The component force r1 of r which tries to rotate counterclockwise is generated. However, rolling is eased by the force acting in the direction to cancel the reaction force r of the central spring 37.

  That is, in the conventional configuration of FIGS. 12 and 13, when the central spring 37 is removed, the lens holder 35 is located on the two springs 37 side from the arrangement of the ball 36 and the two left and right springs 37 excluding the center. The mechanism will not be established by falling. Even if this fall is not considered, the two spring forces on the left and right act in the direction of increasing rolling, which impairs the anti-vibration performance.

  FIG. 6 shows a state in which the second group lens holder 21 of the present embodiment is slightly moved in the right direction in the drawing along the X axis by image blur correction drive, similarly to FIG.

  When F acts as a driving force (composite force) for image blur correction, the second group lens holder 21 receives the reaction force R from the two springs 23. Therefore, the hook engaging portion 21a of the second group lens holder 21 receives the reaction force R. The magnitude of the reaction force R depends on how the hook portion 23a of the spring 23 is applied to the hook engaging portion 21a. It will vary greatly depending on whether you are.

  FIG. 7 is an enlarged view around the right hook engaging portion 21a of the second group lens holder 21 shown in FIG.

  The hook locking portion 21a has a shape such that a plane formed by the hook portion 23a of the spring 23 (a plane including the arcuate end portion of the spring) is parallel to the A-axis direction that is a driving direction for image blur correction. . On the other hand, although not shown in FIG. 7, the left hook engaging portion 21 a is a driving direction for correcting the image blur in a plane formed by the hook portion 23 a of the spring 23 (a plane including the arc-shaped end portion of the spring). The shape is parallel to a certain B-axis direction. Therefore, the frictional force of the hook portion 23a of the spring 23 is greatly changed in the R1 direction and the R2 direction with respect to the hook engaging portion 21a of the second group lens holder 21. Since the hook portion 23a of the spring 23 is positioned at the lowest point of the groove of the hook engaging portion 21a of the second group lens holder 21 by the spring force, even if the second group lens holder 21 is displaced in the R1 direction, the hook portion 23a is hooked at the lowest point. The part 23a rolls and tries to absorb the displacement. Further, when displaced in the R2 direction, the contact point with the hook locking portion 21a changes while rubbing at all times in the ring having the degree of freedom of the hook portion 23a. The R1 direction causes rolling friction with respect to the hook locking portion 21a (because the hook portion 23a rolls with respect to the hook locking portion 21a), and the frictional force is very small. On the other hand, the R2 direction generates sliding friction (because the hook portion 23a slips with respect to the hook locking portion 21a), and therefore generates a very large frictional force.

  Accordingly, when the reaction force R in FIG. 6 is divided into R1 and R2, the component force R2 of the sliding friction is very large and the component force R1 becomes a negligible friction force, resulting in the second group lens holder 21. As shown in FIG. 8, the force for rotating the center of gravity relative to the center of gravity appears as a resultant force R3.

  As described above, rolling that occurs during driving for image blur correction is a counterclockwise force with respect to the center of gravity represented by F1. On the other hand, the resultant force of the reaction force received by the spring 23 is clockwise with respect to the center of gravity as represented by R3, and the force is acting in the direction of canceling rolling by such a way of applying the spring. Recognize.

  The above is an explanation when the second group lens holder 21 is moved in the X direction as image blur correction driving. However, since it has a bilaterally symmetric shape, the same applies when it is moved to the opposite side in the X direction (right side in FIG. 8) Result.

  FIG. 9 shows a state in which the second group lens holder 21 is slightly moved upward along the Y axis in the image blur correction drive.

  When F acts as a resultant force of image blur correction driving, the second group lens holder 21 receives the reaction force R from the two springs 23. Forces generated during image blur correction driving are F3 and F4 as component forces of F, and component force F3 is effective in the direction of rotation with respect to the center of gravity. However, since the second lens group holder 21 has a symmetrical shape with respect to the Y axis, the component forces F3 are in a direction to cancel each other. Therefore, rolling does not occur. For the reaction force R, R4 and R5 are generated as component forces, and the component force R4 is effective in the direction of rotation with respect to the center of gravity. Does not occur.

  As described in the case of moving along the X axis in FIG. 6, the strength of R4 actually changes depending on how the spring 23 is applied, but since there is no substitute for canceling each other, the detailed explanation is as follows. Omitted.

  The above is an explanation when the second group lens holder 21 is moved in the Y direction as image blur correction driving. However, since it has a bilaterally symmetric shape, it is also moved when moved in the direction opposite to the Y direction (downward in FIG. 9). Similarly, no rolling occurs.

  FIG. 10 shows a state in which the second group lens holder 21 is slightly moved along the A axis in the diagonally upper right direction in the drawing by image blur correction driving.

  When F acts as a resultant force of image blur correction driving, the second group lens holder 21 receives the reaction force R from the two springs 23. Forces generated during image blur correction driving are F5 and F6 as F component forces, and in the direction of rotation with respect to the center of gravity, the right component force F5 and the left component force F6 are effective. However, since F5> F6, the second group lens holder 21 rolls to rotate counterclockwise with respect to the center of gravity by the difference force. On the other hand, the force that the second group lens holder 21 receives from the spring 23 as a reaction force varies depending on the frictional force of the left and right hook engaging portions 21a as described above. In this case, the right reaction force R is caused by sliding friction and the left side. Since the reaction force R is rolling friction, the reaction force R on the right side is a much stronger force.

  Therefore, the magnitude of the component force on the drawing is R7> R6, but considering the frictional force, the magnitude of the actual working force is R6> R7, and the force is rotated in the clockwise direction with respect to the center of gravity. work. Also in this case, rolling is relaxed by a counterclockwise reaction force acting on the counterclockwise rolling.

  The above is an explanation when the second group lens holder 21 is moved in the A-axis direction as image blur correction driving. However, since it has a bilaterally symmetric shape, it is moved to the opposite side of the A-axis direction (diagonal left lower direction in FIG. 10). In the same way, the rolling will be alleviated.

  FIG. 11 shows a state in which the second group lens holder 21 has moved slightly along the B axis in the diagonally lower right direction in the figure by image blur correction driving.

  When F acts as a resultant force for image blur correction driving, the second group lens holder 21 receives the reaction force R from the two springs 23. Forces generated during image blur correction driving are F7 and F8 as F component forces, and in the direction of rotation with respect to the center of gravity, the right component force F7 and the left component force F8 are effective. However, since F8> F7, the second lens group holder 21 rolls to rotate counterclockwise with respect to the center of gravity by the difference force. On the other hand, the force that the second group lens holder 21 receives from the spring 23 as a reaction force varies depending on the frictional force of the left and right hook engaging portions 21a as described above. In this case, the reaction force R on the right side is the friction on the left side due to rolling friction. Since the reaction force R is sliding friction, the left reaction force R is a much stronger force.

  Therefore, although the magnitude of the component force on the drawing is R8> R9, considering the frictional force, the magnitude of the actual working force is R9> R8, and the force is rotated in the clockwise direction with respect to the center of gravity. work. Also in this case, rolling is relaxed by a counterclockwise reaction force acting on the counterclockwise rolling.

  The above is an explanation when the second group lens holder 21 is moved in the B-axis direction as the image blur correction drive. However, since it has a bilaterally symmetrical shape, it is moved to the opposite side of the B-axis direction (oblique left upper direction in FIG. 11). In the same way, the rolling will be alleviated.

  As described above, the case where the second group lens holder 21 is driven in the X direction, the Y direction, the A axis direction, and the B axis direction on the XY plane has been described. It can be seen that the spring force is acting in the direction of canceling.

  Further, when the second group lens holder 21 is moved in a driving direction other than the above, any combination of driving is performed, and when rolling occurs, the spring force acts in the direction of canceling it.

  In this embodiment, the force applied to the magnets 22A and 22B at the time of image blur correction driving has been described. However, in the case of other forces (gravity, external inertial force, etc.), it can be considered the same because it can be explained by the case where it is applied to the magnet that is dominant by the weight of the lens holder.

  The image blur correction apparatus in the above embodiment has the second group lens holder 21 that holds the correction lens 26 movably relative to the second group base member 28 in a plane orthogonal to the optical axis. Furthermore, it has two magnets 22A and 22B or coil units 24A and 24B for moving the second group lens holder 21, a second group base member 28, and three balls 25 held between the second group lens holder 21. . Further, hook portions 23 a provided at one end and the other end are respectively engaged with the second group base member 28 and the second group lens holder 21, and three balls 25 are interposed between the second group base member 28 and the second group lens holder 21. There are two springs 23 that are urged so as to sandwich them.

  The magnets 22 </ b> A and 22 </ b> B are attached, and the center of gravity of the second group lens holder 21 that holds the correction lens 26 is configured to exist inside the triangle formed by the three balls 25. This positional relationship is based on a state in which the second group lens holder 21 is lifted so that the center of the correction lens 26 coincides with the optical axis of another photographing lens optical system. Further, the magnets 22A and 22B or the coil units 24A and 24B, the balls 25, and the magnets 22A and 22B are arranged so that a line segment in a plane formed by the two springs 23 straddles substantially two sides of the triangle formed by the balls 25. Each of the springs 23 is disposed. More specifically, the line segment formed by the two springs 23 is a line segment formed by the two hook locking portions 21a.

  Therefore, it is possible to reduce the number of parts and improve the assemblability.

  Further, the driving means comprising the two magnets 22A, 22B or the coil units 24A, 24B moves the second group lens holder 21 in the A axis direction (first direction) and the B axis direction (second direction) perpendicular to the A axis direction. In the direction). Of the two springs 23, the hook engaging portion 21 a of the second group lens holder 21 is connected to the hook portion 23 a so that the plane formed by the hook portion 23 a of one spring is parallel to the A-axis direction. Is provided. Similarly, the hook engaging portion 21a of the second group lens holder 21 is provided to the hook portion 23a so that the deformed surface formed by the other spring hook portion 23a is parallel to the B-axis direction.

  The plane formed by the hook portion 23 a of the spring 23 is a plane including the arc-shaped end portion of the spring 23. The plane formed by the hook portion 23a of the spring 23 in the vicinity of one of the magnets 22A and 22B or the coil units 24A and 24B moved in the A-axis direction is orthogonal to the A-axis direction. Similarly, the direction of the hook portion 23a of the spring 23 in the vicinity of the other magnet 22A, 22B or the coil units 24A, 24B to be moved in the B-axis direction is set to be orthogonal to the B-axis direction.

  Therefore, an image blur correction apparatus that does not cause rolling can be realized by using only two springs except the central spring that is difficult to be applied between the second group lens holder 21 and the second group base member 28. This greatly contributes to the improvement of assembly and is effective for miniaturization of the camera.

  Although the present embodiment has been described with the configuration in which the magnets 22A and 22B are attached to the second group lens holder 21, the configuration in which the coil units 24A and 24B are attached to the second group lens holder 21 is also the same. At this time, the magnets 22 </ b> A and 22 </ b> B are attached to the second group base member 28. Regarding the center of gravity, the center of gravity of the second group lens holder 21 to which the coil units 24A and 24B are attached and holding the correction lens 26 may be considered.

(Correspondence between the present invention and the embodiment)
The second group base member 28 corresponds to the base member of the present invention. Further, the second group lens holder 21 is a holding member that holds the image blur correction lens of the present invention so as to be relatively movable in a plane orthogonal to the optical axis of the optical system other than the image blur correction lens. Equivalent to. Further, the two magnets 22A, 22B or the coil units 24A, 24B constitute a component of the driving means of the present invention, one of which corresponds to two magnets or two coils attached to the holding member. . Further, the three balls 25 correspond to the three balls of the present invention, and the two springs 23 correspond to the two springs of the present invention.

  In the above embodiment, an example is described in which the present invention is applied to a camera that is an image pickup apparatus including an image shake correction device. It is.

21 Lens Holder 21a Hook Locking Part 22A Magnet 22B Magnet 23 Spring 23a Locking Part 24A Coil Unit 24B Coil Unit 25 Ball 28 Group 2 Base Member

Claims (5)

A base member;
With respect to the base member, a holding member for holding relatively movably in a plane perpendicular to the optical axis of the optical system of the image-shake correcting lenses,
A hook portion formed at one end is locked to the holding member, and the other end is locked to the base member and the holding member;
One of the coils or the magnet is attached to the holding member, and driving means for moving the holding member in a second direction perpendicular to the first direction and the first direction,
By the biasing force of the two springs, anda three balls sandwiched between the base member and the holding member,
When the center of the image blur correction lens held by the holding member coincides with the optical axis, the holding in a state where either the coil or the magnet and the image blur correction lens are attached. The center of gravity of the member is located inside the triangle formed by the three balls in the plane, and the hook portion of one of the two springs and the engaging portion of the holding member, The holding member is formed so that a line segment connecting the hook portion of the other spring and the engaging portion with the holding member straddles two sides of the triangle, and the three balls and the two springs are Place and
Wherein the plane containing the hook portion of the hand of the spring the first Ri parallel to name and direction, as the plane containing the hook portion of the other spring is parallel to the second direction, the two An image blur correction device , wherein the hook portions of two springs are respectively engaged with the holding member . The holding member is formed to be line symmetric with respect to a symmetry axis,
The locking portion between the two springs and the holding member is formed at a position equidistant from the symmetry axis,
The engaging portion between the hook portion of the one spring and the holding member is opposite to either the coil or the magnet that moves the holding member in the first direction with respect to the symmetry axis. Either the coil or the magnet is located at the hook portion of the other spring and the holding member moves the holding member in the second direction with respect to the axis of symmetry. image blur correction device according to claim 1, characterized that you opposite to the. The hook part is formed at an arcuate end,
A plane including the arc-shaped end of the one spring is parallel to the first direction, and a plane including the arc-shaped end of the other spring is parallel to the second direction, image blur correction device according to claim 1 or 2, wherein the arcuate ends of the two springs is characterized that you have been and locked to each of the holding member. Imaging apparatus characterized by having an image blur correction apparatus according to any one of claims 1 to 3. Optical apparatus characterized by having an image blur correction apparatus according to any one of claims 1 to 3.

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