JP2015055688A - Optical device having drive means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device that uses an oscillation type actuator enabling a contact member and an oscillation member to be contacted with each other at a predetermined position in a direction orthogonal to a drive.SOLUTION: An optical device uses an oscillation type actuator that generates drive force between a contact member and an oscillation member, in which the contact member includes the oscillation member including an electro-machine conversion element and a magnet, the contact member being in contact with the oscillation member, and an oscillation is excited to the electro-machine conversion element. In the optical device, the oscillation type actuator, in which when viewing from a driving direction, the magnet is arranged on both sides of the contact member in the oscillation member or a member having repelling magnetic force against the contact member and anchoring the oscillation member, is used to drive an optical member.

Description

  The present invention relates to an optical apparatus having a drive source for driving a lens in the optical axis direction, and more particularly to an optical apparatus using a vibration type linear actuator as a drive source.

  Some optical devices use a vibration type linear actuator as a driving source for driving a lens (see, for example, Patent Document 1). In the optical apparatus proposed in Patent Document 1, a vibration type linear actuator is configured by a vibration member that generates vibration by an electro-mechanical energy conversion action and a contact member that is in pressure contact with the vibration member. In the optical apparatus, the vibration type linear actuator fixes the vibration member to the lens holding member, fixes the contact member to the fixing member of the lens barrel, and excites driving vibration in the vibration member. The lens holding member is moved together with the vibration member. Alternatively, in the optical device, the vibration type linear actuator is configured such that the contact member is fixed to the lens holding member, the vibration member is fixed to the fixing member of the lens barrel, and the vibration vibration member is excited to drive vibration. The lens holding member is moved together with the member.

  For example, Patent Document 1 describes a configuration of a vibration type linear actuator. A slider which is a contact member is configured by joining a magnet and a friction material. The magnet has a quadrangular prism shape extending in the moving direction. The magnet has an N pole or an S pole on two surfaces parallel to the longitudinal direction of the magnet and parallel to each other. The rectangular plate-shaped friction material is joined to the S pole or N pole. The surface of the friction material opposite to the surface of the friction material joined to the magnet is the pressure contact surface of the slider.

  In addition, the vibrator as a vibration member includes an electro-mechanical energy conversion element and a plate-like elastic member whose vibration is excited by the electro-mechanical energy conversion element. The electro-mechanical energy conversion element has a rectangular plate shape, and a flexible wiring board for supplying electric power for exciting vibration is bonded to one surface side. The elastic member is a ferromagnetic material bonded to a surface opposite to the surface of the electro-mechanical energy conversion element to which the flexible wiring board is bonded.

  The elastic member has pressure contact surfaces of the elastic member at two locations in the advancing direction in contact with the pressure contact surface of the slider on the side opposite to the bonded surface. The slider magnet attracts the ferromagnetic body of the vibrator, so that the pressure contact surface of the friction material of the slider is in pressure contact with the pressure contact surface of the elastic member of the vibrator to constitute a vibration type linear actuator. An optical apparatus having the vibration actuator is disclosed.

JP 2006-301457 A

  However, in the conventional technique disclosed in Patent Document 1 described above, if the center of the width in the driving direction of the pressure contact portion of the slider is shifted from the center of the width in the driving direction of the pressure contact portion of the vibrator, the attracting force is applied. However, the bias occurs evenly. Due to the bias of the force, a place where a large force is applied is likely to be worn, and the amount of wear is increased. Therefore, when the slider and the vibrator are tilted and tilted, the worn part is pressed and the unworn part is lifted, and the contact state of the pressed part is lowered. Therefore, there has been a problem that the thrust of the vibration type linear actuator becomes small.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical apparatus having a vibration type actuator that can reduce the deviation between a slider and a vibrator.

In order to achieve the above object, the present invention provides:
a. a vibration member including an electromechanical conversion element;
b. a contact member including a magnet;
c. the contact member is in contact with the vibrating member;
d. by exciting vibrations in the electromechanical transducer,
e. Generate driving force between contact member and vibrating member
f. In optical equipment using vibration type actuators,
g. On both sides of the contact member as seen from the driving direction,
h. The contact member has a repulsive magnetic force,
i. The magnet is placed on the vibration member or the member that fixes the vibration member
j. The optical member is driven by using a vibration type actuator

  ADVANTAGE OF THE INVENTION According to this invention, the optical apparatus which has a vibration type actuator which made it possible to reduce the deviation of a slider and a vibrator | oscillator can be provided.

1 is a diagram illustrating an optical apparatus according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view of a surface perpendicular to the optical axis of the optical apparatus according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view of the vibrator according to the first embodiment of the present invention. 1 is a perspective view of a vibrator according to a first embodiment of the present invention. It is a perspective view of a vibrator and a slider of the 1st example of the present invention. It is a figure which shows the magnetic force line of the vibrator | oscillator and slider of 1st Example of this invention. It is a figure which shows a magnetic force line when the vibrator | oscillator and slider of 1st Example of this invention have shifted | deviated from the predetermined position. It is a disassembled perspective view of the vibrator | oscillator of 2nd Example of this invention. It is a figure which shows a magnetic force line when the vibrator | oscillator and slider of 2nd Example of this invention have shifted | deviated from the predetermined position. It is a disassembled perspective view of the vibrator | oscillator of 2nd Example of this invention. It is a figure which shows the optical apparatus of the 3rd Example of this invention. It is sectional drawing of the drive part of the 3rd Example of this invention.

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

[First embodiment]
[Example 1]
FIG. 1 is a cross-sectional view of a surface including an optical axis of an optical apparatus used in a photographing apparatus such as a video camera according to the first embodiment of the present invention. FIG. 2 is a sectional view of a plane perpendicular to the optical axis of the optical apparatus according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view of the vibrator, the vibrator mounting portion, and the magnet in the mounting portion. FIG. 4 is an assembly view of FIG. FIG. 5 is an assembly diagram when the vibrator and the slider are brought into contact with each other.

  The optical system of the lens barrel is a variable power optical system having a four-group configuration having convex / concave / convex / convex power as a photographing lens, and in order from the subject side, the first group lens L1, the second group lens L2, and the third group. A lens L3 and a fourth group lens L4 are arranged.

  The fixed first group lens L1 is held by the fixed lens barrel 1, and the second group lens L2 that moves in the direction of the optical axis O and performs a zooming operation is held by the zooming moving frame 2. The fixed third group lens L3 is held by the afocal lens barrel 3. Further, the fourth group lens L4 that moves in the direction of the optical axis O and performs the focusing operation is held by the focusing moving frame 4, and the imaging element 6 is fixed to the rear barrel 7. The filter 5 is fixed by being sandwiched between the rear barrel 7, the imaging element 6 and the rubber frame 25.

  Between the fixed barrel 1 and the rear barrel 7, first and second guide bars 8 and 9 are provided, and the zooming movement frame 2 and the focusing movement frame 4 are the first and second guide bars. The guide bars 8 and 9 are supported so as to be movable in the optical axis direction. Further, the variable magnification moving frame 2 and the focusing moving frame 4 are respectively fitted to the first and second guide bars 8 and 9 through sleeve portions having a predetermined length in the optical axis direction, Falling in the direction of the optical axis is prevented. Further, the variable magnification moving frame 2 and the focusing moving frame 4 are engaged with the first and second guide bars 8 and 9 via the U-groove portion, so that the first and second guide bars 8 and 9 are rotated. Is prevented from rotating.

  The afocal barrel 3 is fixed to the rear barrel 7. The aperture unit 10 is fixed to the rear barrel 7. The aperture unit 10 moves the aperture blades in opposite directions to change the aperture diameter.

  The rear barrel 7 is provided with a focus reset switch 11. The focus reset switch 11 is composed of a photo interrupter, and detects the switching between light shielding and light transmission due to movement of the light shielding portion 4a formed in the focusing moving frame 4 in the optical axis direction, and outputs an electrical signal. Based on the electrical signal from the focus reset switch 11, a control circuit (not shown) determines whether or not the fourth group lens L4 is located at the reference position.

  The structure of the vibration type actuator that drives the variable magnification moving frame 2 will be described later. The focusing moving frame 4 is driven in the optical axis direction by a focus motor which is a stepping motor (not shown).

  The optical position sensor 22 is fixed to the fixed barrel 1. The scale 23 is disposed at a position facing the position sensor 22 and is fixed to the variable magnification moving frame 2. The position sensor 22 reflects the light projected from the position sensor 22 with the scale 23, receives the reflected light with the position sensor 22, and detects the relative movement amount of the zoom moving frame 2 by the output of the position sensor 22. To do.

  When the camera is turned on, the microcomputer 32 monitors the outputs of the focus reset circuit 33 and the zoom reset circuit 34. While monitoring this, the focus motor drive circuit 37 rotates the focus motor to move the focusing moving frame 4 in the optical axis direction. In addition, the zoom motor drive circuit 38 drives the vibration type linear actuator to move the variable magnification moving frame 2 in the optical axis direction.

  The outputs of the focus reset circuit 33 and the zoom reset circuit 34 are the positions where the in-focus moving frame 4 and the variable magnification moving frame 2 are set in advance, that is, the light-shielding portions provided in the respective moving frames 4 and 2, respectively. When the boundary position where the light emitting part is shielded is reached, the light is reversed. This series of operations is referred to as a reset operation of the focusing movement frame 4 and the magnification movement frame 2. The microcomputer 32 obtains accurate distance information including the absolute position of the in-focus moving frame 4 by counting the number of driving steps of the focus motor thereafter using the focus reset position as a reference.

  Further, the microcomputer 32 obtains accurate distance information including the absolute position of the zooming movement frame 2 by counting the number of subsequent steps of the zoom position sensor 41 with the zoom reset position as a reference.

  The aperture drive circuit 39 drives the aperture unit 10, the signal of the image sensor 6 is processed by the camera signal processing circuit 40, and the aperture aperture diameter is based on the brightness information of the video signal taken into the microcomputer 32 by the signal. Is controlled.

  Further, the in-focus position can be adjusted by moving the in-focus moving frame 4 by operating the focus operation switch 42. Further, by operating the zoom operation switch 43, the zoom motor drive circuit and the focus motor drive circuit drive the zoom movement frame 2 and move the focusing movement frame 4 to perform the zoom operation. I can do it.

  Next, the structure of the vibration type linear actuator will be described. A leaf spring 12 having a high rigidity in the optical axis direction, a low rigidity in the vertical direction of the optical axis, and a low rigidity in the rotational direction in the optical axis direction is attached to the variable magnification moving frame 2 with screws 13 and 14. The vibrator 16 that is a vibration member includes an electro-mechanical energy conversion element 16a and a plate-like elastic member 16b whose vibration is excited by the electro-mechanical energy conversion element 16a. The vibrator 16 which is the vibration member is attached to the leaf spring 12 with screws 1001 and 1002 and female screw magnets 1003 and 1004 together with the spacer 15. On one surface side of the elastic member 16b, there are pressure contact surfaces 16c and 16d that are in pressure contact with the pressure contact surface 21a of the slider 21.

  The pressure contact surfaces 16c and 16d are surfaces that are short in the driving direction and long in the direction perpendicular to the driving method, and protrude. A flexible wiring board 1011 for supplying electric power for exciting vibration is bonded to the other surface of the electro-mechanical energy conversion element 16a. The female screw magnets 1003 and 1004 are positioned by the positioning pins 15a and 15b of the spacer 15, and are fixed by being prevented from rotating by the rotation stopping pins 15c and 15d.

  The slider fixing frame 17 is attached to the fixed barrel 1 and the rear barrel 7 with screws 18 and 19. A vibration absorbing plate 20 made of rubber or elastomer resin which is a vibration absorbing member is fixed to the slider fixing frame 17. The slider 21, which is a contact member including the slider magnet 21 c and the friction material 21 b, is attached to the vibration absorbing plate 20. The slider 21 is in contact with the vibrator 16, and the vibrator 16 and the slider 21 are attracted by magnetism and are in pressure contact with each other.

  The female screw magnets 1003 and 1004 are at an equal distance from the slider magnet 21c of the slider 21 in the direction perpendicular to the moving direction.

  Next, a magnetic circuit formed by the slider magnet 21c and the internal thread magnets 1003 and 1004 will be described with reference to FIGS. The female screw magnets 1003 and 1004 are made of magnets, and the direction of the magnetic force of the female screw magnets 1003 and 1004 is the same as that of the slider magnet 21 c of the slider 21. A magnetic field is generated by the slider magnet 21c of the slider 21. When the magnetic field lines are expressed, the slider magnet 21c exits the slider magnet 21c, passes through the outer side of the friction plate 21b, the elastic member 16b, the slider magnet 21c, and the slider magnet 21c. Magnetic field lines 1012 and 1013 entering the surface of Thus, an attractive force is generated between the slider 21 and the vibrator 16.

  A magnetic field is generated by the female screw magnets 1003 and 1004. In terms of the lines of magnetic force, magnetic lines 1014, 1015, 1016, and 1017 that exit from the female screw magnets 1003 and 1004, pass through the outside of the elastic member 16 b, the female screw magnets 1003 and 1004, and enter the opposite surface of the female screw magnets 1003 and 1004. Become. The female screw magnets 1003 and 1004 are arranged on both sides of the slider 21. The magnetic field between the slider 21 and the internal thread magnets 1003 and 1004 generates a magnetic force in the same direction. The magnetic lines of force become magnetic lines of force 1012a, 1013a, 1014a, and 1016a, and the internally threaded magnets 1003 and 1004 generate forces of the same magnitude in the direction away from the slider 21.

  Here, as shown in FIG. 7, a state when the female screw magnet 1004 approaches the slider 21 and the female screw magnet 1003 moves away from the slider 21 will be described. The generated magnetic field is changed by the slider magnet 21c of the slider 21 and the female screw magnets 1003 and 1004, and the magnetic field lines thereof are magnetic field lines 1018, 1019, 1020, 1021, 1022, and 1023. The gap between the slider magnet 21c of the slider 21 and the female screw magnet 1004 is narrowed, the gap between the magnetic lines of force 1018a and 1020a is increased, and the repulsive force is larger than the state of FIG.

  Further, the gap between the slider magnet 21c of the slider 21 and the female screw magnet 1003 is widened, the distance between the magnetic lines 1019a and 1022a is widened, and the repulsive force is smaller than the state of FIG. Therefore, when the vibrator 16 moves to a position shifted from the center of the slider 21, the force acting between the slider 21 and the female screw magnets 1003 and 1004 is generated in the central direction between the female screw magnets 1003 and 1004. To do. For this reason, the slider 21 is returned to the center of the female screw magnets 1003 and 1004, so that the vibrator 16 contacts at the center of the slider 21.

  The pressure contact surface 21 a of the slider 21 is fixed to the slider magnet 21 c of the slider 21, the vibration absorbing plate 20, the slider frame 17, and the rear barrel 7. The pressure contact surface 16 a of the vibrator 16 is positioned by the spacer 15, the leaf spring 12, the moving frame 2, and the bars 8 and 9. Further, the bars 8 and 9 are positioned by the fixed lens barrel 1 or the rear lens barrel 7. As described above, since the fixing and positioning are performed by a large number of parts, the pressure contact surfaces 21a and 16a of the slider 21 and the vibrator 16 are displaced in the direction perpendicular to the moving direction.

  However, even if the slider 21 and the vibrator 16 are displaced from the center due to manufacturing errors, the force between the slider 21 and the female screw magnets 1003 and 1004 acts as a force in the center, and the deformation of the spring 12 causes the center to move to the center. Since it is arranged in one side, one side is not worn.

[Example 2]
The structure of the vibration linear actuator will be described. Since the structure of the lens barrel is the same as that of the first embodiment, the description thereof is omitted. FIG. 8 is an exploded perspective view of the vibrator, the vibrator mounting portion, and the magnet in the mounting portion.

  A leaf spring 1005 having a high rigidity in the optical axis direction, a low rigidity in the vertical direction of the optical axis, and a low rigidity in the rotational direction in the optical axis direction is attached to the variable magnification moving frame 2 with screws 13 and 14. The vibrator 1033 which is a vibration member includes an electro-mechanical energy conversion element 1033a and a plate-like elastic member 1033b whose vibration is excited by the electro-mechanical energy conversion element 1033a. On one surface side of the elastic member 1033b, there are pressure contact surfaces 1033c and 1033d that are in pressure contact with the pressure contact surface 1034b of the slider 1034. The pressure contact surfaces 1033c and 1033d are short in the driving direction and long in the direction perpendicular to the driving method, and have a recess at the center in the longitudinal direction and project.

  A flexible wiring board 1011 that supplies electric power for exciting vibration is bonded to the other surface of the electro-mechanical energy conversion element 1033a. The screws 1006 and 1007 are attached to the leaf spring 1005 by female screw magnets 1030 and 1031. The leaf spring 1005 has standing bent portions 1008 and 1032 in which a bending line is bent in a crank shape parallel to the driving direction between the female screw mounting portion and the portion deformed in the pressure contact direction. The standing bent portions 1008 and 1032 are deformed so that the pressure contact surfaces 1033c and 1033d move in the direction perpendicular to the moving direction.

  The slider fixing frame 17 is attached to the fixed barrel 1 and the rear barrel 7 with screws 18 and 19. A vibration absorbing plate 20 made of rubber or elastomer resin which is a vibration absorbing member is fixed to the slider fixing frame 17. A slider 1034 which is a contact member including a magnet is attached to the vibration absorbing plate 20.

  Further, the slider 1034 is in contact with the vibrator 1033, and the vibrator 1033 and the slider 1034 are attracted by magnetism and are in pressure contact with each other.

  Next, a magnetic circuit made up of the slider magnet 1034a and the internal thread magnets 1030 and 1031 will be described with reference to FIGS. The magnetization of the slider magnet 1034a is perpendicular to the pressure contact surface, and the magnetization direction is reversed at the center of the pressure contact surface as viewed from the drive direction.

  A magnetic field is generated by the slider magnet 1034 a of the slider 1034. The magnetic field is represented by magnetic lines 1035, magnetic lines 1036, and magnetic lines 1037. The magnetic force line 1035 exits from the slider 1034, passes through the vibrator 1033, passes through the slider 1034 again, exits from the opposite side of the slider 1034, and returns to the slider 1034 again. The magnetic force line 1036 exits the slider 1034, goes outside the slider 1034, passes through the vibrator 1033, and returns to the slider 1034 again. The magnetic force line 1037 exits from the slider 1034, passes through the vibrator 1033, goes outside the slider 1034, and returns to the slider 1034 again. The slider 1034 and the vibrator 1033 generate an attracting force due to a magnetic field represented by magnetic lines of force 1035, 1036, and 1037 and are brought into pressure contact with each other.

  The female screw magnets 1030 and 1031 are at an equal distance from the slider magnet 1034a of the slider 1034 with respect to the direction perpendicular to the moving direction. The female screw magnets 1030 and 1031 are made of magnets, and the direction of the magnetic force of the female screw magnets 1030 and 1031 is the same direction as the side closer to the slider 1034. A magnetic field is generated by the female screw magnets 1030 and 1031. The magnetic field is represented by lines of magnetic force 1038, 1039, 1040, 1041. The magnetic force line 1038 exits the female screw magnet 1031, passes through the outside of the female screw magnet 1031, passes through the vibrator 1033, and returns to the female screw magnet 1031. Similarly to the magnetic force line 1038, the magnetic force line 1039 exits the female screw magnet 1031, passes through the outside of the female screw magnet 1031, passes through the vibrator 1033, and returns to the female screw magnet 1031. The magnetic force line 1040 exits the female screw magnet 1030, passes through the vibrator 1033, passes through the outside of the female screw magnet 1030, and returns to the female screw magnet 1030. Similarly to the magnetic lines of force 1040, the magnetic lines of force 1041 pass through the vibrator 1033 and return to the internal thread magnet 1030 through the outside of the internal thread magnet 1030.

  The female screw magnets 1030 and 1031 are arranged on both sides of the slider 1034 and generate magnetic force in the same direction as the side near the slider 1034. Since the magnetic lines of force between the slider 1034 and the female screw magnets 1030 and 1031 become magnetic lines of force 1038a, 1036a, 1037a, and 1040a, the female screw magnets 1030 and 1031 generate a force in a direction away from the slider 1034. The lines of magnetic force when the female screw magnet 1031 approaches the slider 1034 are shown in FIG.

Magnetic lines of force representing magnetic fields generated by the slider 1034 and the internal thread magnets 1030 and 1031 are magnetic lines of force 1042, 1043, 1044, 1045, 1046, 1047, 1048.
The magnetic lines 1045a and 1043a between the slider 1034 and the female screw magnet 1031 are denser than the state shown in FIG. 9, and the repulsive force between the slider 1034 and the female screw magnet 1031 is increased. The magnetic lines of force 1044a and magnetic lines of force 1047a between the slider 1034 and the female screw magnet 1030 are sparser than the state of FIG. 9, and the repulsive force between the slider 1034 and the female screw magnet 1030 is small.

  Therefore, when the vibrator 1033 moves to a position shifted from the center of the slider 1034, the force acting between the slider 1034 and the female screw magnets 1030 and 1031 is generated in the central direction between the female screw magnets 1030 and 1031. To do. For this reason, the slider 1034 moves to the center of the female screw magnets 1030 and 1031, so that the vibrator 1033 contacts at the center of the slider 1034.

  A pressure contact surface 1034 a of the slider 1034 is fixed to the slider magnet 1034 a of the slider 1034, the vibration absorbing plate 20, the slider frame 17, and the rear barrel 7. The pressure contact surface 1033 a of the vibrator 1033 is positioned by the leaf spring 1005, the moving frame 2, and the bars 8 and 9. Further, the bars 8 and 9 are positioned by the fixed lens barrel 1 or the rear lens barrel 7. As described above, since the fixing and positioning are performed by a large number of components, the slider 1034 and the pressure contact surfaces 1034a and 1033a of the vibrator 1033 are displaced in the direction perpendicular to the moving direction.

  However, if the slider 1034 and the vibrator 1033 are decentered to one side when the contact portion is shifted from the center due to a manufacturing error, the force between the slider 1034 and the female screw magnets 1030 and 1031 acts as a force in the center direction. The standing bent portions 1008 and 1032 are deformed so that the contact surface is in the center. Accordingly, it is possible to prevent the contact surface between the slider 1034 and the vibrator 1033 from deviating from the center, and the one side is strongly pressed and the one side is worn.

  The effect of the embodiment is that compared with FIG. 1, even with a small force, due to the deformation of the standing bent portions 1008 and 1032 of the spring 1005, the pressure contact portion hits the center, the suction force becomes uniform, and one side has a large pressure contact force. Thus, it is possible to reduce wear on one side.

[Example 3]
Hereinafter, with reference to FIG. 11 and FIG. 12, an optical apparatus according to a third embodiment of the present invention will be described. FIG. 11 is a cross-sectional view of a surface including an optical axis of an optical apparatus used in a photographing apparatus such as a video camera according to the third embodiment of the present invention. FIG. 12 is a detailed view of the vibration type linear actuator of the third embodiment of the present invention.

  The optical system of this lens barrel is a variable power optical system with a five-group configuration having convex / concave / convex / convex power as a photographing lens, and in order from the subject side, a first group lens L51, a second group lens L52, a third lens system. A group lens L53, a fourth group lens L54, and a fifth group lens L55 are arranged.

  The fixed first group lens L51 is held by the fixed barrel 51. The second lens group L52 that moves in the optical axis O direction and performs a zooming operation is held by the zooming moving frame 52. The third group lens L53 that moves in the direction of the optical axis O and performs the correction operation is held by the correction moving frame 53. The fixed fourth group lens L54 is held by the afocal lens barrel 54. Further, the fifth group lens L55 that moves in the direction of the optical axis O to perform the focusing operation is held by the focusing movement frame 55, and the imaging element 57 is fixed to the rear barrel 58. The filter 56 is fixed by being sandwiched between the rear barrel 58, the imaging element 57, and the rubber frame 75. The cam ring 201 is fitted to the inner diameter of the fixed barrel 51.

  A roller 202 is attached to the variable magnification moving frame 52. The roller 202 is fitted in the cam 201 a of the cam ring 201 and the rectilinear groove 51 a of the fixed barrel 51. Due to the rotation of the cam ring 201, the variable magnification moving frame 52 moves in the optical axis direction. A roller 203 is attached to the correction moving frame 53. The roller 203 is fitted in the cam 201 b of the cam ring 201 and the rectilinear groove 51 a of the fixed barrel 51. The correction moving frame 53 moves in the optical axis direction by the rotation of the cam ring 201.

  The suction member 204 is fixed to the cam ring 201 with a screw 205. A rubber ring 206 that is a vibration absorbing member is in contact with the adsorption member 204. A contact magnet ring 207 made of a magnet is in contact with the rubber ring 206.

  Three vibrators 208 are arranged in pressure contact with the circumference of the contact magnet ring 207. A spacer 209 is attached to the vibrator 208. A leaf spring 210 is attached to the spacer 209. The leaf springs 210 are attached to three vibrator fixing portions 212 b of the vibrator holding frame 212 with screws 211. The vibrator holding frame 212 is fixed to the fixed barrel 51 with screws 213. The gap between the stopper portion 212 a of the vibrator holding frame 212 and the contact magnet ring 207 is less than the movable amount of the vibrator 208 by the leaf spring 210.

  The vibrator 208 is attracted and pressed by a magnetic force to a contact magnet ring 207 formed of a magnet. The contact magnet ring 207 is attracted by a magnetic force to the attracting member 204 formed of a magnetic member and is pressed against the rubber ring 206. Even if the contact magnet ring 207 is separated from the rubber ring 206 due to an impact, the movement is restricted by the stopper portion 212a, and the original position is returned to the original position by the attractive force due to the magnetic force.

  Further, the magnet members 1009 and 1010 are attached to the vibrator 208. Further, the magnet members 1009 and 1010 are arranged with the contact magnet ring 207 interposed therebetween.

  First and second guide bars 59 and 60 are provided between the afocal lens barrel 54 and the rear lens barrel 58, and the focusing movement frame 55 is provided with the first and second guide bars 59 and 60. Is supported so as to be movable in the optical axis direction. Further, the focusing movement frame 55 is fitted to the second guide bar 60 via a sleeve portion having a predetermined length in the optical axis direction, thereby preventing the focusing movement frame 55 from falling in the optical axis direction. Further, the focusing movement frame 55 is engaged with the first guide bar 59 via the U-groove portion, so that the rotation around the second guide bar 60 is prevented.

  The afocal barrel 54 is fixed to the rear barrel 58. The aperture unit 61 is fixed to the rear barrel 58. The aperture unit 61 moves the aperture blades in opposite directions to change the aperture diameter.

  The rear barrel 58 is provided with a focus reset switch 62. The focus reset switch 62 is formed of a photo interrupter, and detects the switching between light shielding and light transmission due to movement of the light shielding portion 55a formed in the focusing movement frame 55 in the optical axis direction, and outputs an electrical signal. Based on the electrical signal from the focus reset switch 62, a control circuit (not shown) determines whether or not the fifth group lens L55 is located at the reference position.

  When the camera is turned on, the microcomputer 32 monitors the outputs of the focus reset circuit 33 and the cam ring reset circuit 64. While monitoring this, the focus motor drive circuit 37 rotates the focus motor to move the focusing moving frame 4 in the optical axis direction. Further, the cam ring motor drive circuit 63 drives a vibration type actuator composed of the vibrator 208 and the contact magnet ring 207 to rotate the cam ring 201 so that the variable magnification moving frame 52 and the correction moving frame 53 are moved in the optical axis direction. Move.

The outputs of the focus reset circuit 33 and the cam ring reset circuit 64 are respectively obtained from the positions where the focusing movement frame 55 and the cam ring 201 are set in advance, that is, the focusing movement frame 55 and the light shielding portion provided on the cam ring 201, respectively. When the boundary position where the light emitting part of the reset switch is shielded is reversed. This series of operations is referred to as a reset operation of the focusing movement frame 55 and the cam ring 201. The microcomputer 32 obtains accurate distance information including the absolute position of the in-focus moving frame 55 by counting the number of driving steps of the focus motor thereafter with the focus reset position as a reference.
Further, the microcomputer 32 obtains accurate distance information including the absolute position of the cam ring 201 by counting the number of subsequent steps of the cam ring position sensor 65 with reference to the cam ring reset position.

  The diaphragm drive circuit 39 drives the diaphragm unit 61, and the diaphragm aperture diameter is controlled based on the brightness information of the video signal taken into the microcomputer 32.

  Further, the focus position can be adjusted by moving the focus movement frame 55 by operating the focus operation switch 42. Further, by operating the zoom operation switch 43, the cam ring motor drive circuit 63 and the focus motor drive circuit 37 drive the cam ring 201 and move the in-focus moving frame 55 to perform a zooming operation. I can do it.

  Next, the magnet members 1009 and 1010 will be described. When the magnet is a ring, the vibrator 208 is pressed against the inner diameter side with respect to the radial width of the contact magnet ring 207 so that the pressing force is made uniform by moving the vibrator toward the inner diameter side. Yes. The magnet members 1009 and 1010 are magnetized so as to repel the magnetic field of the contact magnet ring 207, and are disposed at equal positions on both sides of the contact magnet ring 207.

  For this reason, when the contact magnet ring 207 and the vibrator 208 deviate from a predetermined position in the radial direction, the repulsive force of the magnet member closer to the contact magnet ring 207 than the far side increases and moves to the predetermined position. Force is generated in the direction of Due to this force, the contact magnet ring 207 and the vibrator 206 are arranged at predetermined positions.

  The contact magnet ring 207 is held by the rubber ring 206, the attracting member 204, the cam ring 201, and the fixed barrel 51. The vibrator 206 is held by a spacer 209, a leaf spring 210, a vibrator holding frame, and the fixed barrel 51. Since each is held by a large number of parts, a radial error occurs between the contact magnet ring 207 and the vibrator 208. However, due to the force generated in the magnet members 1009 and 1010, the contact magnet ring 207 and the vibrator 206 are moved to a predetermined position in the radial direction and are pressed against each other.

  In this embodiment, the magnet member is arranged at an equal distance from the contact magnet ring. However, the magnetizing force may be changed by changing the distance between the magnet member and the contact magnet ring.

  As an effect of the embodiment, since a force in a direction opposite to the shift acts between the contact magnet ring 207 and the magnet members 1009 and 1010, the eccentricity can be suppressed. For this reason, it is possible to eliminate or alleviate that one side of the contact portion hits strongly and the one side is worn away.

16, 1033, 208 ... vibrator (vibrating member)
21, 1034 ... slider (contact member) 207 ... contact magnet ring (contact member)
20 ... vibration absorbing plate (vibration absorbing member) 206 ... rubber ring (vibration absorbing member)
17 ... Slider fixing frame (adsorption member) 101 ... Adsorption plate (adsorption member)
204 ... Adsorption member (adsorption member)
1003, 1004, 1030, 1031 ... Female thread magnet (magnet)
1009, 1010 ... Magnet member (magnet)
12, 210, 1005 ... leaf spring

Claims (4)

a. a vibration member including an electromechanical conversion element;
b. a contact member including a magnet;
c. the contact member is in contact with the vibrating member;
d. by exciting vibrations in the electromechanical transducer,
e. Generate driving force between contact member and vibrating member
f. In optical equipment using vibration type actuators,
g. On both sides of the contact member as seen from the driving direction,
h. The contact member has a repulsive magnetic force,
i. The magnet is placed on the vibration member or the member that fixes the vibration member
j. An optical device characterized in that an optical member is driven using a vibration type actuator. The optical apparatus according to claim 1, wherein the magnets arranged on both sides of the contact member are at an equal distance from the contact member. The optical device according to claim 1, wherein the contact member is linear or annular. a. A control method characterized in that the contact members are arranged on an inner diameter side and an outer shape side of an annular contact member.