JP6517962B2 - Image stabilization device and zoom lens unit - Google Patents

Description

  The present invention relates to a camera shake correction device for correcting a camera shake at the time of shooting with a camera, and a zoom lens unit in which the camera shake correction device is incorporated.

  Generally, home-use video cameras and digital still cameras are provided with an optical shake correction device. In an optical camera shake correction apparatus, an image formed by a lens for photographing is tied on an imaging device by moving a lens or the imaging device in response to shaking (moving) on the imaging device due to camera shake. The position of the image is corrected and held approximately constant. In the case of a moving image, the shake of the image due to camera shake is eliminated from the movement of the image due to the movement of the subject or the camera.

  There has been proposed a camera shake preventing unit that moves a correction lens in a direction perpendicular to the optical axis direction of a shooting lens with respect to an imaging element and a shooting lens (see, for example, Patent Document 1). In this camera shake prevention unit, the slide member to which the correction lens is fixed to the holder is supported so as to be movable in the direction orthogonal to the optical axis direction of the correction lens. Four balls are disposed between the holder and the slide member, and grooves are formed in the holder and the slide member at positions where the balls are sandwiched. The direction of the groove of the holder and the direction of the groove of the slide member are orthogonal to each other.

  Further, on the opposite side of the holder of the slide member, a control spring as a triangular frame-shaped plate spring for pressing the slide member to the holder side is provided, and three balls are disposed between the slide member and the control spring, The slide member is movable in the direction orthogonal to the optical axis direction of the correction lens with respect to the control spring.

  In addition, the movement of the slide member is performed by supplying an electric current to the coil in the magnetic field of the permanent magnet, and the slide member is a groove of the slide member by the first permanent magnet and the first coil. The second permanent magnet and the second coil are driven along the groove of the holder in the other direction (direction orthogonal to the one direction).

In addition, on the slide member, two feedback magnets, which are permanent magnets, are installed corresponding to one direction and the other direction as the above two drive directions, respectively, and at a position facing the footback magnet of the holder Hall sensors are provided.
The position of movement of the slide member along one direction and the other direction can be detected by the Hall sensor, and feedback control of the movement of the slide member can be performed based on the movement position of the slide member.

JP 2011-158714 A

  By the way, in patent document 1, while four balls are arrange | positioned between a holder and a slide member, three balls are arrange | positioned between a slide member and a control spring which is a plate spring, a holder, a slide member, The three members of the control spring are three-tiered with the balls interposed therebetween, and the length in the optical axis direction is long, making it difficult to reduce the size and cost.

  Then, in the state which pinched | interposed the ball between the holder and the slide member, it is possible to connect with a coil spring as a compression spring, for example. This eliminates the need for a control spring for pressing the slide member against the holder from the opposite side of the holder, and also eliminates the need for a ball between the slide member and the plate-like control spring, resulting in a compact and cost-effective structure.

  However, as a drive actuator for moving the slide member relative to the holder, the holder and the slide member need to be provided with two permanent magnets, a yoke and a coil, for example, in two directions orthogonal to each other. It is necessary to provide a position detection device consisting of a permanent magnet and a Hall element for detecting the position of the slide member with respect to the holder for feedback control, for the two directions described above.

  Therefore, considering the space efficiency of the structure of the holder and the slide member, the number of balls and coil springs is preferably small, and it is preferable not to disturb the arrangement of the above-mentioned magnets, coils, Hall elements and the like. However, depending on the number and arrangement of the balls and coil springs, in the movement of the slide member, the hysteresis in which the forward path and the return path are different may increase, or the slide member may rotate not only in parallel but also in parallel. I have a problem.

  In home-use video cameras, a zoom lens with a large magnification is incorporated in a small video camera, and a relatively large portion of the video camera is occupied by the zoom lens unit. The zoom lens unit includes a plurality of fixed lenses, a lens unit moving in the optical axis direction for zooming, a lens unit moving in the optical axis direction for focusing, and the above-described camera shake correction And a lens group.

  When setting a lens in the case of such a zoom lens unit, for example, a holder holding a lens and a lens group is set in order along the optical axis direction. However, in the zoom lens unit, shortening the working time is difficult when the lenses are set in order along the optical axis direction. In addition, when putting the lens in the case in order, the lens putting the upper part of the lens put in front will be covered next, and it is difficult to visually recognize the installation state of each lens, and there is a possibility that the yield will deteriorate. is there.

  The present invention has been made in view of the above-mentioned circumstances, and it is possible to make it compact and, at the time of movement of the lens, a camera shake correction device capable of suppressing the hysteresis of the movement locus and the rotation of the moving lens The purpose is to provide a unit.

The camera shake correction device according to the present invention includes a slider for holding a lens and a base for supporting the slider, sandwiching three or more balls between the base and the slider, and by the plurality of elastic bodies. Camera shake correction for movably supporting the slider in the direction orthogonal to the optical axis direction of the lens by mutually attracting the base sandwiching the ball and the slider in the direction of the optical axis of the lens In the device
When the position of the optical axis of the lens is at a predetermined neutral position with respect to the base, the elastic body sequentially arranges the middle point of the line segment connecting the two elastic bodies or the three or more elastic bodies. The center of gravity of a polygon formed by connecting to the base is connected to the base and the slider so as to substantially coincide with the position of the optical axis.

  According to such a configuration, the optical axis direction of the lens supported by the slider is taken as the Z axis direction, the two directions orthogonal to the optical axis direction are taken as the X direction and the Y direction, and these X and Y directions are orthogonal. If, for example, the slider is moved in the X and Y directions by two electric actuators consisting of a magnet and a coil, the elastic body extends between the base and the slider in an oblique direction with respect to these. As a result, each elastic body exerts a force on the slider in a direction that prevents movement by the electric actuator.

  In this case, if the middle point of the line segment or the center of gravity of the polygon does not coincide with the optical axis of the lens held by the slider at the neutral position, the elastic body The force of the movement is not uniform, and the movement direction of the slider causes a deviation in the movement locus. For example, when the slider is moved from the right to the left at an angle of 45 degrees in the X direction and when the slider is moved from the left to the right, hysteresis having different movement trajectories occurs. Also, a rotational force acts on the slider.

  With the slider in the neutral position, each elastic body is arranged symmetrically (for example, rotationally symmetrical) with respect to the optical axis position of the lens, that is, a line connecting these elastic bodies in the case of two elastic bodies. Preferably, the midpoint of the minute is arranged to coincide with the optical axis of the lens.

  When the slider is at the neutral position, and there are three or more elastic bodies, the center of gravity of the polygon formed by connecting these elastic bodies in order is arranged to coincide with the optical axis of the lens Is preferred. With such an arrangement, the force from the elastic body as described above when moving the slider acts in the direction to return the slider to the neutral position, and in the movement of the slider It will suppress the occurrence.

In the configuration of the present invention, the elastic body is a tension spring provided with hooks at both ends,
The base and the slider include a plurality of locking portions for locking the hooks, respectively.
The locking portion includes a control unit that controls the direction of the hook.
The restricting means includes a groove that restricts the rotation of the hook around the longitudinal central axis of the tension spring, and an adhesive that restricts the movement of the hook in the extension direction.
The restricting means of all the locking portions of the base fixes the directions of all the hooks restricted by the restricting means in the same direction.
It is preferable that the restricting means of all the locking portions of the slider be fixed so that the directions of all the hooks restricted by the restricting means are the same.

According to such a configuration, it is possible to prevent the force in the rotational direction from acting on the slider when moving the slider.
When the tension spring is fixed by the hook and the tension spring is extended obliquely in each direction, there is a possibility that the spring constant may change depending on the direction of the hook and the direction in which the tension spring is extended obliquely. Therefore, when a plurality of tension springs are simultaneously diagonally extended in the same direction, if the direction of the hook of each tension spring is different, the force applied to the slider is different depending on each tension spring due to the difference in spring constant. There is a risk of rotation.
Therefore, by making the directions of the hooks the same for each tension spring, when the tension springs are extended in the same direction, the forces exerted on the slider by the tension springs become substantially the same, and the rotation of the slider is suppressed. be able to. Also in this case, although the force applied from each tension spring to the slider changes depending on the direction in which the tension springs are extended, the force applied from each tension spring to the slider is substantially the same because each tension spring changes similarly. .

In the configuration of the present invention, the elastic body is a tension spring provided with hooks at both ends,
The base and the slider include a plurality of locking portions for locking the hooks, respectively.
It is preferable to provide a point contact holding means for holding the locking portion and the hook in a point contact state.

  According to such a configuration, when the hook is rotatable but does not shift at the fulcrum of the hook, it is possible to suppress the change of the spring constant depending on the direction in which the tension spring is extended as described above. Thereby, for example, when the slider is driven in the normal direction and the reverse direction on the same straight line, it is possible to suppress the generation of hysteresis whose movement locus is different in the forward direction and the reverse direction, and the rotation of the slider described above. . That is, since the change in the spring constant due to the direction in which the tension spring is extended can be made small, it is possible to prevent the force acting from the tension spring from changing depending on the direction regardless of the movement in any direction. As a result, it is possible to suppress the occurrence of hysteresis and rotation of the movement trajectory of the slider described above.

  Further, in the configuration of the present invention, it is preferable that only two elastic bodies are disposed between the base and the slider.

  According to such a configuration, by reducing the number of elastic bodies, the space efficiency of the base and the slider can be improved and miniaturization can be achieved. Further, the cost can be reduced by reducing the number of elastic bodies. Further, since the number of operations for attaching the elastic body between the base and the slider is minimized, the assembly operation of the image stabilization apparatus can be facilitated, the manufacturing time can be shortened, and the cost can be reduced.

In the configuration of the present invention, when the slider is at the neutral position with respect to the base, three or more balls sandwiched between the base and the slider are connected in order. the center of gravity of the polygon, as substantially to match the position of the optical axis, it is preferable that the ball is held in the base and the slider.

According to such a configuration, the movement of the slider relative to the base can be stabilized. When moving the slider, the ball does not exert a force as large as an elastic body from the ball, and the above-mentioned hysteresis of the movement of the slider and the rotation of the slider are small, but the elastic body exerts a force In the closed state, the arrangement of the balls is arranged so as to be far from rotational symmetry with respect to the optical axis position of the lens at the neutral position, and a force acts to tilt the slider when the distribution of the balls is biased. The movement of the slider becomes unstable.
Therefore, with the slider at the neutral position, the center of gravity of the polygon formed by sequentially connecting three or more balls sandwiched between the base and the slider coincides with the optical axis position of the lens at the neutral position. Is preferred.

Further, in the configuration of the present invention, ball holding means for holding the ball, movement range restricting means for restricting a movement range in a direction orthogonal to the optical axis of the slider with respect to the base, and rotation of the slider with respect to the base And rotation range regulation means for regulating the range,
The ball holding means is provided opposite to each other so as to hold the ball in a freely rolling manner on the base and the slider.
The movement range restricting means is provided on the base and the slider so as to contact each other and restrict movement when the slider tries to move the predetermined range or more with respect to the base.
It is preferable that the rotation range restricting means be provided on the base and the slider so as to contact each other and restrict the rotation when the slider is about to rotate more than a predetermined range with respect to the base. .

According to such a configuration, it is possible to prevent the ball from falling off the ball holding means by causing the slider to move or rotate largely with respect to the base. That is, the movement range regulating means and the rotation range regulating means regulate the movement or rotation of the slider which causes the ball to fall off.
When the slider moves, the slider comes in contact with the base via the ball, and the slider and the base are in direct contact with each other so as not to affect the movement of the slider relative to the base. That is, when functioning as a camera shake correction device, the moving range regulating means and the rotation range regulating means do not function. For example, when assembling the camera shake correction device to a lens unit or a camera, the slider is touched by touching the slider. Is to prevent the ball from moving and falling. As a result, it is possible to prevent the ball from being assembled in the dropped state and to improve the yield. In addition, it is possible to prevent the ball from falling off due to a large movement or rotation of the slider due to a drop impact or the like after assembly. In addition, when an abnormal current flows in the coil of the electric actuator, it is possible to prevent the slider from moving largely and the ball falling off.

The zoom lens unit according to the present invention is characterized by including the image stabilization device of the above-described configuration.

  According to such a configuration, the same function and effect as those of the above-described shake correction devices can be obtained.

In the above configuration of the present invention, the zoom holder includes a zoom holder on which a zoom lens group is supported, a focus holder on which a focus lens group is supported, and a camera shake correction holder which is the base of the camera shake correction apparatus.
The zoom holder and the focus holder are guided and movable in the optical axis direction of the lens supported by the holders by the same shaft.
It is preferable that the holder for zooming, the holder for focusing, and the holder for camera shake correction are mutually positioned by the shaft by attaching the camera shake correction holder to the shaft.

According to such a configuration, since the zoom holder, the focus holder, and the camera shake correction holder can be positioned relative to each other by the same shaft, it is possible to improve the yield of the zoom lens unit and improve the efficiency of the assembly operation of the zoom lens unit. Can.
That is, since the zoom holder and the focus holder are not guided by different guide members and moved in the optical axis direction but guided by the same shaft, positioning of the zoom holder and the focus holder is performed. Since the alignment can be performed more accurately and more easily than the alignment with the separate guide members, the generation of defective products can be reduced and the yield can be improved.

  Also, in the case that accommodates these holders, for example, the alignment of the optical axis direction can be performed by the shaft instead of matching the optical axis direction of the lenses supported by the respective holders. Can be mounted on the shaft and aligned before each holder is housed in the case. In this case as well, for example, if the camera shake correction not moving in the optical axis direction and the shaft are aligned with the case, the zoom holder and the focus holder are positioned with respect to the case.

In the configuration of the present invention, the zoom holder, the focus holder, and the case for holding the camera shake correction holder are provided.
An opening is formed on the side of the case,
When the camera shake correction holder is inserted from the opening on the inner side surface of the case where the camera shake correction holder is supported, the case is movably fitted in the insertion direction in the side edge of the camera shake correction holder A groove-shaped guide positioning portion for guiding the camera shake correction holder along a direction perpendicular to the optical axis of the lens supported by the camera shake correction holder;
The position of the camera shake correction holder along the optical axis direction and the direction orthogonal to the optical axis direction is determined by the guide positioning unit, and the camera shake correction holder is mounted on the case in the guide positioning unit. It is preferable to be screwed.

  According to such a configuration, the zoom holder, the focus holder and the camera shake correction holder can be inserted and installed from the opening on the side surface of the case. At the time of installation, the camera shake correction holder which does not move in the optical axis direction is inserted into the case while being guided by the guide positioning portion of the case, and the positioning of the optical axis direction and the direction orthogonal thereto is performed by the guide positioning portion It will be. Further, screwing is performed in a state in which the side edge portion of the camera shake correction holder is fitted in the groove portion, and positional deviation due to a force at the time of screwing can be suppressed.

  According to the present invention, the force acting on the slider from the elastic body at the time of movement of the slider prevents the hysteresis of the movement trajectory of the slider and the rotation of the slider, and the camera shake correction is performed more precisely. To eliminate the influence of camera shake more accurately.

It is a perspective view showing each holder of the above-mentioned zoom lens unit. It is a perspective view showing the main case except the lid of the above-mentioned zoom lens unit. It is a perspective view which shows the main case in which each holder was accommodated except the lid | cover of the said zoom lens unit. It is a perspective view which shows the camera shake correction apparatus provided with the base as said holder. It is an exploded perspective view showing the camera shake correction device. It is a front view showing the camera shake correction device. It is a front view showing the base of the camera shake correction device. It is a rear view showing the above-mentioned base. It is a principal part perspective view showing the base of the camera shake correction device. It is a principal part perspective view showing a slot of a stop piece in which a hook of a coil spring of the above-mentioned base and a slider is stopped. It is a principal part perspective view showing another example of a slot of a stop piece in which a hook of a coil spring of the above-mentioned base and a slider is stopped. It is a rear view showing the main case which has a boss to which the above-mentioned base is screwed. It is a rear view showing the main case in the state where the penetration hole which lets the screw of the above-mentioned base pass on the above-mentioned boss. It is a front view which shows the camera shake correction device for demonstrating the moving method of the slider with respect to the base in an Example. It is a graph which shows the hysteresis at the time of the slider movement in a comparative example. It is a graph which shows the rotation (rotation) at the time of the slider movement in a comparative example. It is a graph which shows the hysteresis at the time of the slider movement in the Example which matched the gravity center position of the some coil spring with the optical axis of the lens of the neutral position. It is a graph which shows the rotation at the time of the slider movement in the Example which matched the gravity center position of the some coil spring with the optical axis of the lens of the neutral position. It is a graph which shows the hysteresis at the time of the slider movement in the Example which made the gravity center position to the optical axis, and made the direction of the hook of several coil springs mutually mutually coincide. It is a graph which shows the rotation at the time of the slider movement in the Example which made the gravity center position to the optical axis, and made the direction of the hook of several coil springs mutually mutually coincide. It is a graph which shows the hysteresis at the time of the slider movement in the Example which matched the gravity center position to the optical axis, and supported the hook of the coiled spring by point contact. It is a graph which shows the rotation at the time of the slider movement in the Example which matched the gravity center position to the optical axis, and supported the hook of the coil spring by point contact.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The zoom lens unit according to this embodiment mainly has an optical zoom function and an optical shake correction function, which are provided in video cameras for general consumers.

  As shown in FIGS. 1 to 3, in the zoom lens unit according to this embodiment, the main case 1 and an image forming side (imaging element side) in the main case 1 from the objective side (shooting object side) Five lens groups are arranged side by side.

  The most objective side lens group (not shown) is a lens fixed to the main case 1 and is a first holder 2 fixedly provided at the end of the main case 1 on the objective side (FIGS. 2 and 3) Support). On the image forming side of the first holder 2, a second holder 3 which is movable along the optical axis direction for zooming and which holds the zoom lens group 15 is disposed.

  The third holder 4 supporting the lenses 18 and 19 (shown in FIG. 5), which are lens groups for image stabilization, is disposed on the image forming side of the second holder 3. The third holder 4 supports the base 41 fixed to the main case 1 and the lenses 18 and 19 and a slider 61 movable relative to the base 41 in the direction orthogonal to the optical axes of the lenses 18 and 19. It consists of The third holder 4 is a base 41 of a camera shake correction device that corrects camera shake by moving the lenses 18 and 19.

A fourth holder 5 movable along the optical axis direction for focusing (for focusing) is disposed on the image forming side of the third holder 4, and the fourth holder 5 has a lens group 20 for focusing. Is supported.
In addition, the fifth holder 6 fixed to the main case 1 is disposed on the imaging side of the fourth holder 5, that is, on the most imaging side as shown in FIG. 12 and FIG. A lens group on the most image forming side (not shown: one lens may be provided) is supported.

In such a zoom lens unit, as described above, the third holder 4 is a camera shake correction device. The camera shake correction device includes a base 41 and a slider 61, as shown in FIGS.
Also, between the base 41 and the slider 61, there are disposed three balls 81 (shown in FIG. 5) and two coil springs (elastic body, tension spring) 82 for attracting the base 41 and the slider 61 to each other. And the balls 81 are rollable, so that the slider 61 can be moved parallel to the base 41. The moving direction of the slider 61 is a direction orthogonal to the optical axis direction of the lenses 18 and 19.

  Further, the third holder 4 as a camera shake correction device includes an electric actuator 40 that drives the slider 61 in the X direction when the optical axis direction of the lenses 18 and 19 supported by the third holder 4 is the Z direction. , Y direction, and two electric actuators 40 of an electric actuator 40.

  The electric actuator 40 is provided with a yoke 51, a magnet 52 which is a permanent magnet for driving, and a coil 53, and a current is supplied to the coil 53 in the magnetic flux of the magnetic field formed by the magnet 52 and the yoke 51. Thus, the coil 53 fixed to the slider 61 is moved in the X direction or Y direction as one direction with respect to the magnet 52 and the yoke 51 fixed to the base 41.

  Further, two position detection devices 60 are provided which respectively detect movement (position) of the slider 61 in the X direction and movement (position) of the slider 61 in the Y direction. The position detection device 60 is disposed in a magnetic field which is fixed to the magnet 41 which is a permanent magnet for a sensor fixed to the base 41 and is fixed to the slider 61 and is formed by the magnet 71. And a moving Hall element 72. The position of the slider 61 relative to the base 41 is detected based on the signal from the hall element 72 indicating the change in the magnetic strength.

  The base 41 is a substantially plate-like member, and is provided with a window portion 42 which is a circular opening for transmitting light from the object side to the imaging side at the approximate center thereof. The window portion 42 is provided through the base 41, and the lenses 18 and 19 supported by the slider 61 are disposed so as to overlap in the optical axis direction. Further, for example, it is assumed that the optical axis positions of the lenses 18 and 19 supported by the slider 61 at the neutral position before moving for camera shake correction are disposed at the central position of the window 42 which is a circular opening. It is also preferable that the optical axes of the lenses 18 and 19 supported by the slider at the neutral position pass through the center of the window portion 42 here.

  The base 41 is also provided with two yoke supports 43. The yoke 51 of the electric actuator 40 described above, the magnet 52, and the yoke 51 of the coil 53 are supported by the yoke support portions 43. In addition, the magnet 52 is supported by the yoke 51.

  The yoke 51 has a U-shaped cross section, and the magnet 52 is supported in the U-shaped yoke 51. In the yoke 51 having a U-shaped cross section, the two inner side surfaces are disposed opposite to each other in a substantially parallel state, the magnet 52 is supported on one of the inner side surfaces, and between the magnet 52 and the other inner side surface The coil 53 supported by the slider 61 is disposed.

The magnet 52 has a substantially rectangular plate shape, and the longitudinal direction is orthogonal to the radial direction of the window portion 42.
Thus, the above-described electric actuator 40 is configured, and the slider 61 can be moved relative to the base 41 in the Y and X directions orthogonal to the Z direction of the optical axis.

  Further, in the two yoke support portions 43, the center lines of the supported yokes 51 and magnets 52 are disposed to pass through the center of the window portion 42. Further, in the two yoke support portions 43, center lines of the respective yokes 51 and magnets 52 passing through the center of the above-mentioned window portion 42 are arranged to be orthogonal to each other.

  The base 41 is provided with a sensor magnet support portion 44 for supporting the magnet 71 of the position detection device 60 described above. The two magnet support portions 44 are disposed so as to face each other of the two yoke support portions 43 in a one-to-one relationship, with the centers of the window portions 42 interposed therebetween.

  At this time, the center line of the magnet 71 supported by the magnet support 44 and the center lines of the yoke 51 and the magnet 52 supported by the yoke support 43 facing the magnet support 44 coincide with each other. The center line passes through the center of the window 42.

  In addition, the base 41 has a ball holding portion 45 (shown in FIG. 7) which rotatably holds three balls 81 (shown in FIG. 5) sandwiched between the base 41 and the slider 61 one by one. Three are provided. The number of ball holding portions 45 may be three or more, and is not limited to three. However, three are preferable in consideration of space efficiency, cost, and the like of the base 41 and the slider 61.

  These ball holding portions 45 are orthogonal to the optical axis direction of the lens 18, and are surrounded by the substantially square frame-like protrusions 47 around the rolling surface 46 which is a plane on which the balls 81 roll. . The ball 81 can roll on the inner side of the substantially square frame shaped protrusion 47 corresponding to the movable range of the slider 61 with respect to the base 41.

  The centers (centers of gravity) of these ball holding portions 45 are preferably arranged in rotational symmetry around the center of the window 42, for example, around the window 42, but in this embodiment, they are rotationally symmetric. The position is slightly offset from the position. Needless to say, the center position of the ball holding portion 45 may be arranged to be rotationally symmetrical with respect to the center of the window portion 42.

  Further, the center of gravity of a polygon having the center of the ball holding portion 45 as each corner may be made to coincide with the center of the window portion 42. The center of gravity of the triangle is the intersection of three line segments connecting the vertex of the triangle and the midpoint of the opposite side. The center of gravity of a regular polygon is the center of its inscribed circle and circumscribed circle. Also, the center of gravity of the quadrangle is an intersection point of two line segments respectively connecting the centers of gravity of two triangles divided by two diagonal lines. Also, basically, the center of gravity of a polygon having five or more sides is divided into a plurality of triangles by line segments connecting the vertices of the polygon, and the centers of gravity of each triangle are determined. It can obtain | require by repeating dividing | segmenting into and calculating | requiring a gravity center.

  When the ball 81 and the coil spring 82 are disposed between the base 41 and the slider 61, the three or more ball holding portions 45 are disposed in a dispersed state around the window portion 42. It is sufficient that the slider 61 does not tilt with respect to the above.

  The base 41 includes two locking pieces 48 on which one of hooks provided at both ends of the coil spring 82 is locked. The locking piece portion 48 has a locking piece (locking portion) 49 (shown in FIG. 9) with which one end of the coil spring 82 is locked. Hooks are locked. Two or more coil springs 82 need to be provided, and correspondingly two or more locking pieces 48 also need to be provided. In this embodiment, two coil springs 82 are arranged, and two locking pieces 48 provided with locking pieces 49 are provided.

  The middle point of the line segment connecting the hooking positions of the coil springs 82 of the two locking pieces 49 coincides with the center of the window portion 42. The number of the locking pieces 49 may be two or more, and may be three or four. In this case, the locking piece 49 is disposed such that the center of gravity of the polygon having the position at which the hook of the coil spring 82 of the locking piece 49 is hooked coincides with the center of the window portion 42.

  Further, a groove 50 (shown in FIG. 10) having a V-shaped cross section is formed at a position where the hook of the locking piece 49 is hooked. The hook is locked in the groove 50, and the hook is bonded to the locking piece 49 by an adhesive. As a result, the direction of the hooks is regulated, and the grooves 50 of the locking pieces 49 and the adhesive function as the regulating means for regulating the direction of the hooks. In FIG. 10, the U-shaped hook contacts the V-shaped groove 50 at both ends of the groove 50, and the direction of the hook is determined.

  Further, the directions of the grooves 50 of the two locking pieces 49 are parallel to each other. In this embodiment, the directions of the grooves 50 of the two locking pieces 49 are predetermined with respect to the center lines orthogonal to each other of the magnets 52 (and the yoke 51) of the two electric actuators 40 described above. Of 45 degrees (315 degrees), for example. Note that the direction of the grooves 50 of the two locking pieces 49 is a line connecting the center of gravity of the polygon with the positions at which the hooks of the locking pieces 49 are locked or the positions at which the hooks are locked. It suffices to be parallel to any line passing through the midpoint position of. Here, the direction of the hook is substantially orthogonal to a line passing through the center of gravity and passing through the hook locking position. The hook has a proximal end connected to the coil portion of the coil spring 82 and a distal end not connected, and the direction of the hook is reversed when the positions of the distal end and the proximal end are opposite to each other. Yes, not in the same direction.

  Thus, when the direction of the groove 50 of each locking piece 49 is made the same, the directions of the plurality of hooks applied to the locking pieces 49 are also the same. That is, the direction of the hook is the direction of the groove 50 of the locking piece 49. The hooking structure of the hook of the coil spring 82 in the slider 61 is basically the same as the hooking structure of the hook of the coil spring 82 in the base 41 described above. The following description is based on the premise that the locking structure of the coil spring 82 in the base 41 and the slider 61 is the same.

  Since the coil spring 82 is pulled diagonally when the slider 61 moves with respect to the base 41, the spring constant varies depending on the direction in which the coil spring 82 is pulled with respect to the direction of the hook. . That is, the position to be the fulcrum of the hook when the hook is locked changes depending on the direction in which the hook is locked (the moving direction of the slider 61) and the direction when the hook is locked. Constants will change.

  In this case, if the directions of the hooks of the plurality of coil springs 82 do not match, even if the coil springs 82 of the same standard are used, differences in spring multipliers occur between the coil springs 82 and the slider 61 moves. The force applied to the slider 61 differs depending on the coil spring 82. In this case, a rotational force is generated in the slider 61 by applying a force having substantially the same direction but different magnitudes at each locking position of each coil spring.

  Further, as described above, by making the direction of each hook the same for all the coil springs 82, even if the spring constant of the coil spring 82 changes depending on the moving direction of the slider 61, Since the spring constants are the same, it is possible to prevent the rotational force from being generated in the coil spring 82. That is, the force of the same magnitude acts on the plurality of locking positions of the coil spring 82 of the slider 61 in the same direction, so that the slider 61 moves without rotating.

  Also, in order to reduce the influence of the direction of the hook by the coil spring 82 by a structure other than the structure in which the hooks of the coil springs are fixed in the same direction as described above, the locking pieces 49 and the hooks make point contact It is preferable that the condition is For example, as shown in FIG. 11, at the position of the groove 50a where the hook of the locking piece 49a is hooked, the width of the locking piece 49a is made relatively narrow with respect to the hook, and At the bottom, the center of the groove 50a is high and the end is low. The cross section of the bottom portion of the groove 50a along the direction of the groove 50a in this case is an isosceles triangle having the center of the groove 50a as an apex. Further, the V-shaped angle of the V-shaped groove 50a becomes smaller at the central portion of the groove 50a, so that the width of the groove 50a narrows and the V-shaped angle of the groove 50a increases from the center toward the end. Thus, the width of the groove 50a is increased.

  When hooks of arc shape of coil spring 82 having a substantially circular cross section are hooked on the groove 50a of the locking piece 49a having such a structure, the center of the groove 50a is high, the end is low and the groove 50a direction of the locking piece 49a Because the width along the groove is narrow, the hooks do not contact the bottom of the groove 50a at both ends of the groove 50a, but contact at one point at the center bottom of the groove 50a. Further, at the center of the groove 50a, the width of the groove 50a is narrow and the cross section is V-shaped, so that the hook is restricted from moving in the direction orthogonal to the groove 50a. Since the width of the groove 50a is wide at both ends of the groove 50a, the hook can be rotationally moved about the contact portion at the bottom of the groove 50a.

  The groove 50a of such a locking piece 49a is a point contact holding means which is in point contact with the hook and holds the point contact state.

  In this case, the amount of change in the spring constant of the coil spring 82 caused by the difference in the moving direction of the slider 61 is reduced. For example, when the locking piece 49 and the coil spring 82 are in point contact and the point contact point is the fulcrum, the variation of the spring constant due to the movement direction of the slider can be reduced by not moving this fulcrum. Thus, as described above, the rotation of the slider 61 can be suppressed, and the hysteresis between the movement and the return can be reduced. That is, when the spring constant of each coil spring 82 changes due to the difference in the movement direction of the slider 61 (including the difference in the opposite direction), it is possible to prevent the movement locus from being changed in the drive direction.

  The movement range of the slider 61 relative to the base 41 is regulated, for example, as follows. That is, in the window portion 42 of the surface of the base 41 facing the slider 61 side, for example, an octagonal peripheral wall 39 is provided so as to protrude toward the slider 61 side so as to surround the opening of the window portion 42. A cylindrical portion 70 (shown in FIG. 5) constituting a fitting hole 62 for supporting the lens 18 of the slider 61 is disposed in the surrounding wall 39. By restricting the movement range of the cylindrical portion 70 by the peripheral wall 39 of the window portion 42, the movement range of the slider 61 relative to the base is restricted. The peripheral wall 39 provided on the base 41 and the cylindrical portion 70 provided on the slider 61 constitute movement range restricting means for restricting the movement range of the slider 61 with respect to the base 41.

  In addition, the second holder 3 for zooming is movably guided along the optical axis direction on the base 41, and the fourth holder 5 for focusing (for focusing) is movably along the optical axis direction. A shaft hole 85 is formed in which one shaft 84 of a pair of guiding shafts 83 and 84 (shown in FIG. 1 and the like) to be guided penetrates. The other shaft 83 is disposed on the outside of the base 41 at a position passing between the two magnet support portions 44 projecting at an angle different by 90 degrees and in contact with the base 41.

  Further, the base 41 is provided with two insertion holes 86 and 87 for screwing the base 41 to the main case 1. The insertion holes 86 and 87 are provided in a direction parallel to the optical axis direction of the lens 18. In the insertion holes 86 and 87, screws (not shown) are screwed from the image forming side of the guide positioning portions 7a and 7b of the main case 1 toward the objective side. When the base 41 is set in the guide positioning portions 7a and 7b of the main case 1 so that the insertion holes 86 and 87 overlap the screw holes 75 and 76 of the bosses 77 and 78 on the outer side of the main case 1 described later. The projections 79 and 80 project to the outside of the main case 1.

  As shown in FIG. 5, the slider 61 includes a fitting hole 62 in which the lenses 18 and 19 are fitted and held. The outer peripheral surfaces of the lenses 18 and 19 are positioned in contact with the inner peripheral surface of the fitting hole 62, whereby the center of the fitting hole 62 and the centers of the lenses 18 and 19 coincide with each other. The optical axes of the lenses 18 and 19 are disposed at the center of the lens.

  The slider 61 is provided with two coil support portions 63. The coils 53 constituting the above-described electric actuator 40 are supported by the coil support portions 63 in a state of being positioned. The coil 53 is in a state in which the electric wire is wound in a rectangular frame shape with rounded corners, and the longitudinal direction thereof is in the direction orthogonal to the radial direction of the fitting hole 62.

  In addition, the coil 53 is disposed on the surface of the coil support 63 facing the base 41, and the coil support 63 is disposed parallel to two opposing inner side surfaces of the yoke 51 supported by the base 41. The coil 52 and the coil 53 are disposed close to each other.

  Further, in the two coil support portions 63, the center line of the supported coil 53 is disposed so as to pass through the center of the fitting hole 62 (the center of the lenses 18 and 19 (optical axis position)). The center lines of the two coil support portions 63 passing through the center of the above-mentioned fitting hole 62 are orthogonal to each other at the center position of the fitting hole 62.

  Further, the slider 61 is provided with a sensor support portion 64 for supporting the Hall element 72 of the position detection device 60 described above. The two sensor support parts 64 are disposed so as to face each other of the two coil support parts 63 in a one-to-one relationship, with the centers of the fitting holes 62 (the centers of the lenses 18 and 19) interposed therebetween.

  At this time, the center line of the coil 53 supported by the coil support 63 and the center line of the Hall element 72 supported by the sensor support 64 facing the coil support 63 coincide with each other. The line passes through the center of the fitting hole 62. The center of the fitting hole 62 coincides with the centers of the lenses 18 and 19 fitted in the fitting hole 62, and the optical axes of the lenses 18 and 19 overlap with each other. That is, the optical axes of the lenses 18 and 19 pass through the center of the fitting hole 62.

  The coil 53 and the Hall element 72 are mounted on a flexible wiring board, and a part of the flexible wiring board extends from the slider 61 and is connected to the outside of the zoom lens unit. The portion of the flexible wiring board which projects from the slider 61 is disposed in the direction along the optical axis and is bent in a U-shape, and the slider moves in the direction orthogonal to the optical axis direction. It is arranged so that power is not applied to 61 as much as possible.

  The slider 61 is in a state in which the power is turned on and a current flows in the coil 53 and the hall element 72, that is, in a state in which the power of the electric actuator 40 and the position detection device 60 is on. Are controlled to be placed in the neutral position. The control of the electric actuator 40 is feedback control based on position detection by the position detection device 60, and is controlled by a control device (not shown) provided in a camera module (video camera). At this time, the slider 61 is disposed at the neutral position with respect to the base 41, and when photographing is started and camera shake is detected, the slider 61 is moved from the neutral position.

  When the slider 61 is at the neutral position with respect to the base 41, the center of the window 42 as the predetermined position of the base 41 is controlled so that the optical axes of the lenses 18 and 19 supported by the slider 61 coincide. Ru. In this case, the center of the window 42 of the base 41 and the center of the fitting hole 62 of the slider 61 are disposed on the optical axes of the two lenses 18 and 19.

  In addition, on the slider 61, a ball holding portion 65 (FIGS. 5 and 6) rotatably holds one of the three balls 81 (shown in FIG. 5) sandwiched between the base 41 and the slider 61. The back side is illustrated three).

The ball holding portion 65 faces the rolling surface 46 of the base 41, has a surface parallel to the rolling surface 46, and has a protrusion surrounding the surface. Further, the ball holding portion 65 is a surface on which the ball 81 rolls, and functions as a cover of the ball holding portion 45 of the base 41 for preventing the ball 81 from coming out of the protrusion 47 of the ball holding portion 45. ing.
With the slider 61 in the neutral position, the ball holding portion 65 is disposed to face the ball holding portion 45, and when the slider 61 is in the neutral position, the center of the window portion 42 and the lenses 18, 19 Since the optical axes coincide with each other, the position of the slider 61 with respect to the center of the fitting hole 62 of the ball holder 65 is substantially the same as the position of the ball holder 45 with respect to the center of the window 42 of the base 41. It has become.

  The centers (centers of gravity) of the ball holding portions 65 are preferably arranged in rotational symmetry around the center of the fitting hole 62, for example, around the fitting hole 62, but in this embodiment, the base 41 The position of the ball holding portion 65 is slightly shifted with respect to the above-described position of rotational symmetry corresponding to the ball holding portion 45 of FIG. Needless to say, the center position of the ball holding portion 65 may be arranged to be rotationally symmetrical with respect to the center of the fitting hole 62.

In addition, the center of gravity of a polygon having the center of the ball holding portion 65 as each corner may coincide with the center of the fitting hole 62.
When the ball 81 and the coil spring 82 are disposed between the base 41 and the slider 61 by arranging the three or more ball holding portions 65 in a dispersed state around the fitting hole 62, the base It is sufficient that the slider 61 does not tilt relative to 41. The ball holding portion 45 of the base 41 and the ball holding portion 65 of the slider 61 constitute ball holding means for holding the ball 81.

  The slider 61 is provided with two locking pieces (locking portions) 69 to which the other of the hooks provided at both ends of the coil spring 82 is locked, as shown in FIGS. 4 to 6. A substantially U-shaped hook is locked to these locking pieces 69. As described above, two or more coil springs 82 need to be provided, and correspondingly, two or more locking pieces 69 also need to be provided. In this embodiment, two coil springs 82 are disposed, and two locking pieces 69 are provided.

  The middle point of the line segment connecting the hooking positions of the coil springs 82 of the two locking pieces 69 coincides with the center of the fitting hole 62. The number of the locking pieces 69 may be two or more, and may be three or four. In this case, the locking piece 69 is disposed such that the center of gravity of the polygonal shape whose apex is the position at which the hook of the coil spring 82 of the locking piece 69 is hooked coincides with the center of the fitting hole 62.

  Further, a groove having the same structure as the groove 50 of the base 41 described above is formed at a position where the hook of the locking piece 69 is hooked. The hook is locked in the groove, and the hook is bonded to the locking piece 69 by an adhesive.

  Further, the directions of the grooves of the two locking pieces 69 are parallel to each other. In this embodiment, the directions of the respective grooves of the two locking pieces 69 are predetermined with respect to the center lines orthogonal to each other of the magnets 52 (and the yoke 51) of the two electric actuators 40 described above. It is arranged to be at an angle, for example 45 degrees (315 degrees). The direction of the grooves of the two locking pieces 69 is the middle point position of a polygon connecting the hooking positions of the locking pieces 69 as a vertex or a line connecting the hooks. It should be parallel to any line passing through.

  As described above, when the direction of the groove of each locking piece 69 is made the same, the directions of the plurality of hooks put on the locking piece 49 of the above-mentioned base 41 also become the same. That is, the direction of the hook is the direction of the groove of the locking piece 49. Thereby, the rotation of the slider 61 when the slider 61 is moved as described above is prevented. Therefore, the groove of the locking piece 69 and the adhesive serve as a regulating means for regulating the direction of the hook.

  Further, as described above, in order to reduce the influence of the hook by the coil spring 82, it is preferable that the locking piece 69 and the hook be in point contact as described above. The groove of the piece 69 and the locking piece 69 may have the same structure as the locking piece 49a of the base 41 and the groove 50a of the locking piece 49a described above.

  In the slider 61, as shown in FIG. 4, a rotation restricting portion 74 is provided on the outer side of the sensor support portion 64 (opposite to the fitting hole 62) so as to protrude toward the base 41 side. The rotation restricting portion 74 is disposed to face the magnet support portion 44 of the base 41, and is disposed close to the magnet 71 of the magnet support portion 44. When a force is applied to rotate the slider 61 with respect to the base 41, the rotation restricting portion 74 restricts the movement of the magnet support portion 44 of the base 41 in the direction orthogonal to the above-mentioned center line of the magnet 71. The rotation of the slider 61 with respect to the base 41 that is equal to or greater than the set rotation angle is restricted by the contact. A rotation range restricting means is provided which restricts the rotation range of the slider 61 with respect to the base 41 from the rotation restricting portion 74 of the slider 61 and the magnet support portion 44 of the base 41.

  As described above, the cylindrical portion 70 constituting the fitting hole 62 of the slider 61 is disposed in the peripheral wall 39 which protrudes to the slider 61 side of the base 41 around the window portion 42, thereby the slider relative to the base 41 Although the movement range of 61 is restricted, the structure of the peripheral wall 39 and the cylindrical portion 70 can not restrict the rotation of the slider 61.

  Here, the ball 81 is held between the ball holding portion 45 of the base 41 and the ball holding portion 65 of the slider 61. However, when the slider 61 moves or rotates, the ball holding portion When the ball holding portion 65 deviates from 45, the ball 81 may fall off. The ball holding portions 45 and 65 are provided with the ridges 47 for preventing the ball 81 from falling off, but since the slider 61 is only held by the coil spring 82 on the base 41, the ball 81 is dropped off. It can not be completely prevented.

  The movement range of the slider 61 is restricted with respect to the base 41 as described above, so that when the slider 61 moves in parallel, the balls of the ball holding portion 45 of the base 41 and the ball holding portion 65 of the slider 61 It is designed not to leave until it is in a state where it may fall off. Further, the rotation restricting portion 74 restricts the rotation range of the slider 61 with respect to the base 41 so that the ball holding portion 45 of the base 41 and the ball holding portion 65 of the slider 61 are rotated by the rotation of the slider 61. It is designed so that it does not separate until it is in a state where the ball may fall off.

  As described above, by preventing the ball 81 from falling off the image stabilization device, for example, when the third holder 4 is handled for an assembly operation or the like, it is prevented that the ball 81 is accidentally dropped. be able to. As a result, the workability in the assembly operation and the like can be improved, and it is possible to prevent the decrease in the yield due to not recognizing that the ball 81 has dropped off.

  As described above, in the camera shake correction device, the ball 81 is used to reduce the friction when moving the slider 61 with respect to the base 41, and the slider 61 can be smoothly moved in the direction orthogonal to the optical axis direction. The slider 41 is movably held by the base 41 by attracting the base 41 and the slider 61 to each other by the coil spring 82.

  In this case, when the slider 61 is driven to move in the direction perpendicular to the optical axis as described above with respect to the base 41, the coil spring 82 is extended, and a force acts on the slider 61 on the opposite side in the driving direction. Do. At this time, if the force does not act uniformly from each coil spring 82, a force is applied to the slider 61 in the rotational direction. In addition, even when driven in the drive direction along the straight line, the movement locus changes relative to the straight line depending on the drive direction, and hysteresis occurs.

  Therefore, each center of the line connecting the positions of the coil springs 82 or the center of gravity of the polygon is arranged to coincide with the optical axis position of the lenses 18 and 19 supported by the slider 61 in the neutral state. The above-described hysteresis and rotation of the slider 61 can be suppressed, assuming that the force applied from the coil spring 82 to the slider 61 is balanced.

Further, as described above, by making the direction of the hooks of the coil springs 82 the same, when the slider 61 is driven, the spring constants of the coil springs become substantially the same, and the rotational force acts on the slider 61. Can be suppressed.
Further, by making the hooks of the coil spring 82 and the locking pieces 49 and 69 on which the hooks are hooked in point contact, it is possible to suppress the change of the spring constant of each coil spring 82 depending on the driving direction of the slider 61. it can. Thereby, the above-mentioned hysteresis and rotation of the slider 61 can be suppressed.

  Further, in this embodiment, three balls 81 and two coil springs 82 are provided, and these are the minimum necessary number. Therefore, the number of parts can be reduced, the cost can be reduced, and the amount of assembly work can be reduced.

  Also, in the case where there are two coil springs 82, the difference between the forces acting on the slider 61 from the two coil springs 82 generates the rotational force of the slider 61, and in the case of three or more coil springs 82. Depending on the situation, the slider 61 may be easily rotated. However, as described above, the midpoint of the line connecting the two coil springs is made to coincide with the optical axis of the lens 19 of the slider 61 at the neutral position, and the hook direction of the coil spring 82 is made constant. The point contact between the hooks of the spring 82 and the locking pieces 49 and 69 to which the hooks are hooked can suppress the rotation of the slider 61.

  Also, as described above, the three balls 81 can be smoothly based if the center of gravity of the triangle with each ball 81 as the apex coincides with the optical axis of the lenses 18 and 19 held by the slider 61 at the neutral position. The slider 61 can move relative to 41.

Next, the mounting structure of the lens to the zoom lens unit will be described.
As described above, the main case 1 is integrally provided at the tip end on the substance side, and the portion of the first holder 2 for holding the objective lens group is cylindrical. The base end side of the first holder 2, that is, the side on which an image is formed (image forming side) is one in which the second holder 3 to the fourth holder 5 are accommodated separately from the above main case 1. There is a square cylindrical holder storage portion 1c whose cross section is close to a square.

  The holder storage portion 1c has two faces parallel to each other, and is formed in a quadrangular cylinder shape from four faces, and has a shape in which one face is opened. A lid is attached to this portion to close it. That is, the main case 1 is provided with a case main body 1a having a holder housing portion 1c having a square cylindrical shape and one face opened, and a lid (not shown).

In a portion constituting the end face of the main case 1, a fifth holder 6 is provided which supports the lens and is integrally provided on the main case 1.
The second to fourth holders 3 to 5 are inserted into the holder housing portion 1c of the main case 1 from one side which is open and installed in the holder housing portion 1c.

  As shown in FIG. 2, the base 41 of the third holder 4 which is a camera shake correction device is fixedly attached to the holder storage portion 1 c of the main case 1. At the mounting position of the third holder 4 of the holder storage portion 1c, with the side edges of the base 41 of the third holder 4 sandwiched from the front and back of the above optical axis direction, the base 41 is orthogonal to the optical axis direction 1 A substantially groove-shaped guide positioning portion 7a, 7b is provided which guides in two directions and positions the position of the base 41 along the optical axis direction and the direction orthogonal to the optical axis direction.

The guide positioning portions 7a and 7b are formed on mutually opposing and parallel wall portions 8 and 9 which constitute two surfaces adjacent to the open surface of the above-mentioned holder storage portion 1c.
A groove-like positioning portion for determining the position of the base 41 is also provided on a wall portion adjacent to the wall portions 8 and 9 and constituting an open surface, that is, a wall portion constituting a surface facing the lid, and the lid.
The positioning portions and the guide positioning portions 7a and 7b need not be grooves. For example, in the inner side surfaces of the wall portions 8 and 9, the peripheral portion of the base 41 is on the object side and the imaging side in the optical axis direction. It is only necessary to arrange a member that sandwiches from.

Further, the base 41 is provided with two insertion holes 86 and 87 for screwing the base 41 to the main case 1. The insertion holes 86 and 87 are provided in a direction parallel to the optical axis direction of the lens 18.
Further, as shown in FIGS. 12 and 13, a boss 77 having screw holes 75 and 76 in a direction parallel to the optical axis direction adjacent to the object side of the insertion holes 86 and 87 in the main case 1 The screw holes 75 and 76 of the bosses 77 and 78 communicate with the insertion holes 86 and 87 of the base 41, and the screw is directed to the object side from the imaging side of the insertion holes 86 and 87. The base 41 is positioned and fixed to the main case 1 by inserting it and screwing it into the screw holes of the bosses 77 and 78.

  The main case 1 is formed with holes for causing the pair of projecting portions 79, 80 provided with the insertion holes 86, 87 of the base 41 in the portions of the guide positioning portions 7a, 7b to protrude from the inside of the main case 1 to the outside. . The guide positioning portions 7a and 7b insert and position the camera shake correction holder which is the third holder 4 having the base 41. However, in the guide positioning portions 7a and 7b, the third holder 4 can be easily inserted. The clearance between the third holder 4 and the third holder 4 in the groove-like portion sandwiching the peripheral portion of the third holder 4 is set wider.

  On the other hand, in the portion of the holes of the guide positioning portions 7a and 7b connected to the bosses 77 and 78 outside the main case 1, that is, the portions of the holes through which the protrusions 79 and 80 of the base 41 penetrate, the clearance is narrowed In a state where the guide portions 41 are guided by the guide positioning portions 7a and 7b, the protrusions 79 and 80 are lightly pushed into the holes. Further, in this state, the clearance between the bosses 77 and 78 and the abutting portions of the projections 79 and 80 is narrowed or no clearance is made, and the projection 79 is pressed against the bosses 77 and 78 It becomes.

  In such a structure, the main case 1 is pressed against the bosses 77 and 78 in a state in which the pair of projecting portions 79 and 80 are inserted into the holes provided in the guide positioning portions 7 a and 7 b of the main case 1. On the other hand, the rotation of the third holder 4 having the base 41 is restricted. In screwing, when the screw is finally tightened, the member to be screwed may rotate with the rotation of the screw. That is, when the third holder 4 is screwed to the main case 1 in a state where the third holder 4 is loosely fitted to the guide positioning portions 7a and 7b, the third holder 4 may be slightly rotated, for example The necessity of screwing while holding the third holder 4 with something arises, and the screwing operation becomes complicated.

  On the other hand, in this embodiment, due to the structure as described above, when screwing, the projections 79, 80 are pressed against the bosses 77, 78, and the pair of projections 79, 80 are holes of the main case 1 respectively. By being inserted into the claws, it is possible to prevent turning at the time of screwing, and screwing operation can be facilitated.

  In addition, when attaching the second to fourth holders 3-5 to the main case 1, as shown in FIGS. 2 and 3, the second to fourth holders 3-5 are attached to the shafts 83 and 84, respectively. Be done. As described above, in the third holder 4, the shaft 84 of one of the two shafts 83 and 84 penetrates the shaft hole 85. The second holder 3 and the fourth holder 5 are provided with shaft holes at positions sandwiching the centers of the lens group 15 and the lens group 20 respectively held, and the shafts 83 and 84 are in a penetrating state. It has become.

  Further, the shaft 83 penetrating the second holder 3 and the fourth holder 5 without penetrating the third holder 4 (base 41) is disposed in contact with the base 41 which is the third holder 4 as described above. The base 41 is prevented from rotating around the shaft 84.

As described above, when the base 41 is attached to the main case, the shafts 83 and 84 and the second holder 3 and the fourth holder 5 in a state in which the shafts pass through are inserted into the main case. The respective shafts 83 and 84 are positioned and supported at shaft positioning portions (not shown) provided at their both ends in the holder storage portion 1 c of the main case 1.
Two shaft positioning portions are provided at each of the object-side end and the imaging-side end of the holder storage portion 1c corresponding to the two shafts 83 and 84.

  The two shafts 83 and 84 are positioned on the main case 1 by these shaft positioning portions. Further, the base 41 as the third holder 4 which does not move in the optical axis direction as described above has the position in the optical axis direction determined by the guide positioning portions 7a and 7b as described above. The position is also determined and further screwed as described above and fixed to the main case 1.

  Therefore, the positions of the two shafts 83 and 84 are determined by the shaft positioning portion of the main case 1 and the base 41, and the second holder 3 which is a zoom holder movable in the optical axis direction on these shafts, and the focus And the 4th holder 4 which is a holder are positioned. Thus, the optical axes of the first to fifth holders 2 to 6 are arranged to coincide with each other. Further, the second holder 3 for zooming moving in the optical axis direction and the fourth holder 5 for focusing are guided by the same shafts 83 and 84.

  In such a zoom lens unit, the second holder 3 for zooming, the third holder 4 for camera shake correction, and the fourth holder 5 for focusing are supported by these holders 3 to 5 with respect to the main case. It can be inserted and installed from a direction substantially orthogonal to the optical axis direction of the lens to be made, that is, from the opening at the side of the main case 1.

  Further, each holder 3 to 5 is set to the two shafts 83 and 84 as described above, and is set to the main case 1 with the optical axes of the lenses of each holder 3 to 5 being aligned. . Further, the third holder 4 for camera shake correction which does not move in the optical axis direction is positioned and screwed and fixed by the guide positioning portions 7a and 7b of the main case 1. Therefore, while the optical axes of the lenses supported by the respective holders 3 to 5 are aligned by the shafts 83 and 84, these holders 3 to 5 are positioned by the shaft positioning portion of the main case 1 The main case 1 is positioned via the third holder 4 (base 41).

  In this case, it becomes possible to align the optical axis of the lens with the main case 1 with high accuracy, as compared to the case where a plurality of holders are set in the main case along the optical axis direction as in the prior art. As compared with the conventional case, the working time can be shortened and the yield can be improved.

An experimental example as an embodiment of the present invention will be described below.
In this experimental example, basically, in the camera shake correction apparatus as the third holder 4 described above,
As shown in FIG. 14, when the electric actuator 40 is operated so as to move the slider 61 relative to the base 41, the movement locus and the slider 61 based on the signal output from the Hall element 72 of the position detection device 60. The rotation angle of is calculated.

As shown in FIG. 14, the slider 61 is driven in the following four patterns by drive control of the slider 61.
The first pattern is shown by a solid line a in FIG. 14 and is a current flowing in the same direction (forward direction) to the coils 53 of the two electric actuators 40 in the opposite direction. The pattern is represented by OO to CC, and in the graphs of FIGS. 15 to 22 described later, changes in the movement trajectory and the rotation angle are indicated by solid lines.

  The second pattern is indicated by the alternate long and two short dashes line b in FIG. 14 and is a reverse pattern of the first pattern, and this pattern is represented by CC to OO, and in the graphs of FIGS. The change of the rotation angle is indicated by a two-dot chain line.

  The third pattern is shown by a double line c in FIG. 14 and reverses the direction of each current from the state in which current flows in opposite directions to the two electric actuators, and this pattern is from OC to CO In the graphs of FIG. 15 to FIG. 22 described later, changes in the movement trajectory and the rotation angle are indicated by double lines.

  The fourth pattern is shown by the double dotted line d in FIG. 14 and is the reverse pattern of the third pattern, and this pattern is represented by CO to OC, and is shifted in the graphs of FIGS. The change of the trajectory and the rotation angle is indicated by a double dotted line.

In addition, conditions of the experiment when driving the slider with the above-described drive pattern will be described.
The first experiment is taken as a comparative example, and the condition of this comparative example is that using three coil springs 82, the center of gravity of the triangle composed of these three coil springs 82 corresponds to the optical axis position of the lenses 18, 19 in the neutral position. It does not match, and the direction of the hook of each coil spring 82 is different.

  The second experiment is taken as Example 1, and the condition of this Example 1 is that three coil springs 82 are used, and the center of gravity of the triangle consisting of these three coil springs 82 is the optical axis of lenses 18 and 19 at neutral position. However, the directions of the hooks of the coil springs 82 are different.

  The third experiment is taken as Example 2, and the condition of this Example 2 is that two coil springs 82 are used, and the middle point of the line segment consisting of these two coil springs 82 corresponds to that of lenses 18 and 19 in the neutral position. It corresponds to the optical axis, and the direction of the hook of each coil spring 82 is the same.

  The fourth experiment is taken as Example 3, and the condition of this Example 3 is that two coil springs 82 are used, and the midpoint of the line segment consisting of the two coil springs 82 corresponds to that of the lenses 18 and 19 in the neutral position. It corresponds to the optical axis, and the hooks of each coil spring 82 are fixed by point contact.

The experimental results are described below. In the comparative example and the examples 1 to 3, the experimental results are shown by two graphs showing the hysteresis of the movement locus when the slider 61 is driven in the opposite direction and the rotation (rotation) of the slider 61. .
In the graph showing the movement locus, the vertical axis is the Y coordinate, the horizontal axis is the X coordinate, and the movement locus is shown in μm. In the graph showing the rotation, the movement distance of the designated position is arranged on the horizontal axis, and the vertical axis is the rotation angle of the slider 61. The unit of rotation angle here is minutes, which is an angle of 1/60 of a degree. The movement trajectory and the angle of rotation are obtained based on the signal output from the Hall element 72 of the position detection device 60.

As shown in the graphs of FIG. 15 and FIG. 16, the results of the comparative example show that the hysteresis of the movement trajectory of the slider 61 is large and the angle of rotation is also large as compared with the cases of Examples 1 to 3 described later. It has become a thing.
On the other hand, in the result of Example 1, as shown in the graphs of FIG. 17 and FIG. 18, the rotation is not largely changed but the hysteresis is reduced. However, since the spring constant differs depending on each coil spring 82 and the spring constant changes depending on the moving direction, the straightness of the slider 61 is low.

In the result of Example 2, as shown in the graphs of FIGS. 19 and 20, the rotation is slightly improved as compared with the result of Example 1, and the rectilinearity of the movement locus is high.
In the result of Example 3, as shown in the graphs of FIG. 21 and FIG. 22, for the comparative example and Examples 1 and 2, rotation and hysteresis, and straightness of movement locus are improved.

From the above experimental results, it is possible that the center of gravity of the middle point connecting the two coil springs 82 or the lens of the slider 61 having the center of gravity of the polygon formed by connecting three or more coil springs 82 in the neutral position. It is preferable to be disposed at the optical axis position.
Further, it is preferable that the hooks of the coil spring 82 be in the same direction. Further, it is more preferable to fix the hooks of the coil spring 82 by point contact.

1 Main case (case)
3 Second holder (holder for zoom)
4 Third holder (base of camera shake correction device)
5 4th holder (holder for focus)
15 to 17 Zoom lens group 20 to 22 Focus lens group 18 Lens 19 Lens 39 Surrounding wall (moving range restricting means)
41 Base (holder for image stabilization)
44 Magnet support (rotation range control means)
49 Locking part (regulating means, point contact holding means)
61 Slider 69 Locking part (regulating means, point contact holding means)
70 Cylindrical part (moving range control means)
74 Rotation regulation part (rotation range regulation means)
81 Ball 82 Coil spring (elastic body, tension spring)
83 shaft 84 shaft

Claims (11)

A slider for holding a lens, and a base for supporting the slider, wherein three or more balls are sandwiched between the base and the slider, and the base sandwiching the ball by a plurality of elastic bodies In the camera shake correction device, the base is movably supported in the direction perpendicular to the optical axis direction of the lens by attracting the slider and the optical axis direction of the lens to each other.
When the position of the optical axis of the lens is at a predetermined neutral position with respect to the base, the elastic body sequentially arranges the middle point of the line segment connecting the two elastic bodies or the three or more elastic bodies. A center of gravity of a polygon formed by connecting to the base and the slider so as to substantially coincide with the position of the optical axis;
The elastic body is a tension spring provided with hooks at both ends,
The base and the slider include a plurality of locking portions for locking the hooks, respectively.
The locking portion includes a control unit that controls the direction of the hook.
The restricting means includes a groove that restricts the rotation of the hook around the longitudinal central axis of the tension spring, and an adhesive that restricts the movement of the hook in the extension direction.
The restricting means of all the locking portions of the base fixes the directions of all the hooks restricted by the restricting means in the same direction.
The restricting means of all the locking portions of the slider fixes the directions of all the hooks restricted by the restricting means in the same direction.
Camera shake correction device characterized by.   The camera shake correction device according to claim 1, further comprising a point contact holding unit that holds the locking portion and the hook in a point contact state.   The camera shake correction device according to claim 1 or 2, wherein only two elastic bodies are disposed between the base and the slider. When the slider is in the neutral position with respect to the base, the center of gravity of a polygon formed by sequentially connecting three or more balls sandwiched between the base and the slider is the optical axis as substantially coincides with the position, the camera shake correction apparatus according to any one of claims 3 that claim 1, characterized in that the ball is held in the base and the slider. Ball holding means for holding the ball, movement range restricting means for restricting the movement range of the slider in a direction orthogonal to the optical axis of the slider with respect to the base, rotation range restricting means for restricting the rotation range of the slider with respect to the base Equipped with
The ball holding means is provided opposite to each other so as to hold the ball in a freely rolling manner on the base and the slider.
The movement range restricting means is provided on the base and the slider so as to contact each other and restrict movement when the slider tries to move the predetermined range or more with respect to the base.
The rotation range restricting means is provided on the base and the slider so as to contact each other and restrict the rotation when the slider is about to rotate more than a predetermined range with respect to the base. The camera shake correction device according to any one of claims 1 to 4, wherein   A zoom lens unit comprising the camera shake correction device according to any one of claims 1 to 5. A zoom holder on which the zoom lens group is supported, a focus holder on which the focus lens group is supported, and a camera shake correction holder which is the base of the camera shake correction apparatus;
The zoom holder and the focus holder are guided and movable in the optical axis direction of the lens supported by the holders by the same shaft.
7. The zoom according to claim 6, wherein the holder for zooming, the holder for focusing, and the holder for shaking correction are positioned relative to each other by the shaft by attaching the holder for shaking correction to the shaft. Lens unit. And a case for holding the zoom holder, the focus holder, and the camera shake correction holder.
An opening is formed on the side of the case,
When the camera shake correction holder is inserted from the opening on the inner side surface of the case where the camera shake correction holder is supported, the case is movably fitted in the insertion direction in the side edge of the camera shake correction holder And a groove-shaped guide positioning portion for guiding the camera shake correction holder along a direction substantially orthogonal to the optical axis of the lens supported by the camera shake correction holder.
The position of the camera shake correction holder along the optical axis direction and the direction orthogonal to the optical axis direction is determined by the guide positioning unit, and the camera shake correction holder is mounted on the case in the guide positioning unit. The zoom lens unit according to claim 7, wherein the zoom lens unit is screwed. A slider for holding a lens, and a base for supporting the slider, wherein three or more balls are sandwiched between the base and the slider, and the base sandwiching the ball by a plurality of elastic bodies In the camera shake correction device, the base is movably supported in the direction perpendicular to the optical axis direction of the lens by attracting the slider and the optical axis direction of the lens to each other.
When the position of the optical axis of the lens is at a predetermined neutral position with respect to the base, the elastic body sequentially arranges the middle point of the line segment connecting the two elastic bodies or the three or more elastic bodies. A center of gravity of a polygon formed by connecting to the base and the slider so as to substantially coincide with the position of the optical axis;
The elastic body is a tension spring provided with hooks at both ends,
The base and the slider include locking portions having a plurality of grooves for locking the hooks, respectively.
Groove of the plurality of engaging portions are all together are oriented in the same direction, to restrict the rotation of the hook about the longitudinal center axis of the tension spring,
The hooks are locked in the grooves of all the locking portions of the base, and the hook and the locking portions are fixed by an adhesive so as to restrict the movement of the hook in the extending direction .
The hooks are locked in the grooves of all the locking portions of the slider , and the hook and the locking portion are fixed by an adhesive so as to restrict the movement of the hook in the extending direction .
Camera shake correction device characterized by.   10. The image stabilizer as claimed in claim 9, further comprising point contact holding means for holding the locking portion and the hook in point contact.   A zoom lens unit comprising the camera shake correction device according to claim 9.

Images