JP6537482B2 - Vibration wave motor and electronic equipment - Google Patents

Description

  The present invention relates to a vibration wave motor and an electronic device.

  The vibration wave motor is driven by pressing a frictional member, which is periodically vibrated by application of a high frequency voltage, to the sliding member to bring it into frictional contact. In the oscillatory wave motor of Patent Document 1, the vibrator can move in the pressing direction with respect to the holding member, but is coupled in the advancing direction without rattling. In order to realize such a configuration, the holding member has a two-piece structure, and the two members are connected via the rolling member.

Patent No. 5969976

  However, since the oscillatory wave motor of Patent Document 1 needs to have both a retaining structure for preventing the rolling member from falling off and a retaining structure for preventing the falling off of the two members of the holding member, It will be enlarged as a whole.

  In view of such problems, it is an object of the present invention to provide a vibration wave motor and an electronic device which can be connected without rattling without enlargement.

A vibration wave motor according to one aspect of the present invention includes: a vibrator; a transmission member for transmitting a pressure force for pressing the vibrator to a sliding member in contact with the vibrator; A connection that connects a first holding member holding one of the vibrator and the transmission member, a second holding member holding the other of the vibrator and the transmission member, and the first and second holding members Means for moving the vibrator and the sliding member relative to each other by the vibration generated in the vibrator, wherein the connecting means includes the first and second holding members. A first rolling member for moving the relative movement in the direction of the pressing force, and a biasing member for biasing the first rolling member in parallel with the relative moving direction of the vibrator and the sliding member And the first holding member is for removing the first rolling member. Comprising a first retaining portion that performs fit, said second retaining member includes a second retaining portion that performs stopper of the first rolling member, the second holding member, the The first retaining member is assembled to the first holding member from the side having the second retaining portion, and the first retaining portion is on the side of the mounting direction of the first holding member with respect to the second retaining member. The first rolling member is prevented from coming off, and the second slipping prevention portion is a state in which the first rolling member comes off in the mounting direction of the second holding member with respect to the first holding member. It is characterized by performing a stop.

  According to the present invention, it is possible to provide a vibration wave motor and an electronic device that can be connected without rattling without upsizing.

It is a sectional view of an imaging device provided with a vibration wave motor concerning an embodiment of the present invention. It is a block diagram of a vibration wave motor. It is the elements on larger scale of a vibration wave motor. It is a figure explaining attachment of an important section. It is a figure explaining the structure of the principal part. It is a figure explaining the structure of the principal part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the drawings, the same members are denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a cross-sectional view of an imaging device provided with a vibration wave motor according to an embodiment of the present invention. The imaging device includes an imaging lens unit 1 and a camera body 2. The vibration wave motor 3 and the focusing lens 4 attached to the vibration wave motor 3 are disposed inside the imaging lens unit 1. An imaging element 5 is disposed inside the camera body 2. The focusing lens 4 is moved along the optical axis O (X axis) by the vibration wave motor 3 at the time of photographing. The subject image is formed at the position of the imaging device 5, and the imaging device 5 generates a focused image. Although the vibration wave motor 3 is mounted on the imaging device in the present embodiment, the present invention is not limited to this. The vibration wave motor 3 may be mounted on an electronic device different from the imaging device, for example, a lens barrel that is detachable from the imaging device. The vibration wave motor 3 may be used not to move the focusing lens 4 along the optical axis O, but to move the shake correction lens in the direction orthogonal to the optical axis O. In addition, although the imaging lens unit 1 is configured integrally with the camera body 2 in the present embodiment, it may be a lens that is detachably attached to the camera body 2.

  FIG. 2 is a block diagram of the vibration wave motor 3. FIGS. 2A to 2D are a perspective view, an exploded perspective view, a front view, and a side sectional view, respectively, of the vibration wave motor 3. FIG. 3 is a partially enlarged view of the vibration wave motor 3. Fig.3 (a) is the elements on larger scale of FIG.2 (c), FIG.3 (b) is the elements on larger scale of FIG.2 (d).

  The friction member (sliding member) 101 and the guide support member (rail plate) 113 are fixed to the ground plate 112 by screws or the like. The pressurizing spring (pressurizing means) 110 connects the pressurizing force transmission member (transmission member) 111 and the driving force transmission member (movable plate) 115 at four positions via a spring hooking portion respectively, and the vibrator 104 A pressing force is applied to bring the friction member 101 into frictional contact. In the present embodiment, although the pressure spring 110 applies pressure to the vibrator 104 at four positions, it is possible to apply pressure to the vibrator 104 at different positions of a plurality of pressure means. For example, the present invention is not limited thereto. Further, the pressing force by the pressing spring 110 is orthogonal to the relative movement direction of the moving unit 120 described later.

  The vibrator 104 includes a diaphragm 102 and a piezoelectric element 103. The diaphragm 102 and the piezoelectric element 103 are fixed by an adhesive or the like. The diaphragm 102 has a contact portion which is a projecting portion provided on the surface opposite to the surface on the side of the pressure transfer member 111, and the contact portion is a friction member in a state of being pressurized by the pressure of the pressure spring 110. Contact 101. The piezoelectric element 103 excites ultrasonic vibration by applying a voltage. By causing ultrasonic vibration to be excited in the piezoelectric element 103 in a state where the diaphragm 102 and the piezoelectric element 103 are bonded, a resonance phenomenon occurs in the vibrator 104. At this time, two types of standing waves are generated in the vibrator 104, and substantially elliptical motion is generated in the contact portion of the diaphragm 102.

  The vibrator holding member 105 holds the vibrator 104 with an adhesive or the like. The pressing mechanism holding member 107, which is a holding case for holding the pressure transmission member 111, includes the vibrator holding member 105 via cylindrical rollers (rolling members) 108 a and 108 b and a plate spring (biasing member) 109. Connected to The pressing mechanism holding member 107 includes a power takeout portion (not shown) connected to the driven body.

  The elastic member 106 is disposed between the piezoelectric element 103 and the pressing force transfer member 111. The elastic member 106 prevents the piezoelectric element 103 from being in direct contact with the pressure part of the pressure transfer member 111 in order to prevent the piezoelectric element 103 from being damaged.

  The pressing mechanism holding member 107 and the movable plate 115 are fixed by a screw or the like. The movable plate 115 is formed with three V-groove moving side guides, and rolling balls 114a to 114c are fitted in the moving side guides, respectively. The rail plate 113 is formed with three groove-shaped fixed side guides. The rolling balls 114 a to 114 c are nipped by the moving side guiding portion formed on the movable plate 115 and the fixed side guiding portion formed on the rail plate 113. In the present embodiment, the three fixed side guides formed on the rail plate 113 are two V grooves and one flat groove with one bottom, but the rolling balls 114a to 114c can roll. It may be a groove.

  In the present embodiment, in order to make the vibration wave motor 3 thinner in the Z-axis direction, the pressure springs 110 are not stacked on the top of the vibrator 104 but are spaced apart to surround the vibrator 104. There is. In the present embodiment, the pressing spring 110 can be made smaller by generating pressing force by the plurality of pressing springs 110. The contact portion of the diaphragm 102 is made of the pressure spring 110 by pressing the vibrator 104 against the friction member 101 in the direction of the arrow C (direction of pressure, direction of pressure) via the elastic member 106 via the pressure spring 110. It contacts the friction member 101 in a state of being pressurized by pressure. When a voltage is applied to the piezoelectric element 103 in this state, the substantially elliptical motion generated in the vibrator 104 is efficiently transmitted to the friction member 101. At this time, the moving unit 120 including the vibrator 104, the vibrator holding member 105, the elastic member 106, the pressing mechanism holding member 107, the pressing spring 110, the pressing force transmission member 111, and the movable plate 115 has the optical axis O Relative to the friction member 101.

  Next, the connecting mechanism 116 for connecting the vibrator holding member 105 and the pressing mechanism holding member 107 will be described. The connection mechanism 116 includes rollers 108 a and 108 b and a plate spring 109. As shown in FIGS. 2 and 3, the rollers 108 a and 108 b are disposed between the vibrator holding member 105 and the pressing mechanism holding member 107 so as to be movable along the Z-axis. The plate spring 109 is disposed between the pressing mechanism holding member 107 and the roller (first rolling member) 108b, and has a biasing force parallel to the X axis. The leaf spring 109 biases the vibrator holding member 105 in the arrow A direction via the roller 108 b and biases the pressing mechanism holding member 107 in the arrow B direction. Thus, the roller (second rolling member) 108 a is held between the vibrator holding member 105 and the pressing mechanism holding member 107.

  By configuring as described above, the vibrator holding member 105 and the pressing mechanism holding member 107 can move along the Z axis by rolling of the rollers 108 a and 108 b. Therefore, the vibrator holding member 105 and the pressing mechanism holding member 107 can be connected without inhibiting the ultrasonic vibration generated in the vibrator 104. In addition, since the vibrator holding member 105 and the pressing mechanism holding member 107 can be connected in a direction parallel to the X axis, that is, in a state in which there is no backlash in the moving direction of the moving unit 120, delay in response due to backlash does not occur. As a result, it is possible to improve the driving efficiency.

  Further, in the present embodiment, the roller 108a abuts on the vibrator holding member 105 at the center side (the side approaching the center of the vibrator 104) and the pressing mechanism holding member at the outside (the side away from the center of the vibrator 104). Contact with 107. The roller 108 b is in contact with the vibrator holding member 105 at the center side, and is in contact with a plate spring 109 held by the pressing mechanism holding member 107 at the outside. Since the pressing mechanism holding member 107 holds the plate spring 109, there is no loss in assemblability, and the piezoelectric element 103, the elastic member 106, the pressing force transmitting member 111, etc., are stacked and disposed at the central portion of the vibrator 104. Interference with other parts of the Therefore, the plurality of pressure springs 110 can be disposed close to the central portion of the vibrator 104, and the external size of the moving portion 120 in plan view with respect to the XY plane can be miniaturized.

  Further, the biasing force of the plate spring 109 is set to be larger than the inertial force due to acceleration / deceleration generated at the start and stop of the drive of the vibrator 104. As a result, since relative displacement along the moving direction of the moving part 120 due to the inertial force at the time of driving does not occur in the vibrator 104 and the vibrator holding member 105, stable driving control can be realized.

  In the present embodiment, the connection mechanism 116 includes the rollers 108a and 108b and the plate spring 109. However, the present invention is not limited to this as long as it includes the rolling member and the biasing member. For example, balls or the like may be used instead of the rollers. Further, in the present embodiment, the plate spring 109 is used as the biasing member that constitutes the coupling mechanism 116, but the backlash between the vibrator holding member 105 and the pressing mechanism holding member 107 can be eliminated. The present invention is not limited to this as long as it is a biasing member.

  Next, assembly of the vibrator holding member 105 and the pressing mechanism holding member 107 will be described with reference to FIG. FIG. 4 is a view for explaining the assembly of the vibrator holding member 105 and the pressing mechanism holding member 107. As shown in FIG. FIG. 4A is a side sectional view before assembly, and FIG. 4B is a side sectional view after assembly. FIG.4 (c) and FIG.4 (d) are the enlarged views of D area | region and E area | region of FIG.4 (b), respectively. As shown in FIG. 4A, the vibrator 104 is assembled to the vibrator holding member 105 before assembling. Further, the rollers 108 a and 108 b and the plate spring 109 are assembled to the pressing mechanism holding member 107.

  First, the retaining structure of the rollers 108a and 108b will be described. As shown in FIG. 4C, when the roller 108a moves by a fixed amount in the positive direction of the Z axis, the roller 108a abuts on the retaining portion 105a formed on the vibrator holding member 105, and the movement is restricted. In addition, when the roller 108a moves a fixed amount in the negative direction of the Z axis, the roller 108a abuts on the retaining portion 107a formed on the pressing mechanism holding member 107, and the movement is restricted. Such a configuration prevents the roller 108a from falling off.

  As shown in FIG. 4D, when the roller 108b moves a fixed amount in the positive direction of the Z axis, the roller 108b abuts on the retaining portion 105b formed on the vibrator holding member 105, and the movement is restricted. In addition, when the roller 108b moves by a fixed amount in the negative direction of the Z axis, the roller 108b abuts on the retaining portion 107b formed on the pressing mechanism holding member 107, and the movement is restricted. Such a configuration prevents the roller 108b from falling off.

  Therefore, the retaining portions 105 a and 105 b prevent the rollers 108 a and 108 b from being removed in the direction in which the vibrator holding member 105 is attached to the pressing mechanism holding member 107. Further, the retaining portions 107 a and 107 b prevent the rollers 108 a and 108 b from being removed in the direction in which the pressure mechanism holding member 107 is attached to the vibrator holding member 105. In other words, the retaining portions formed on one of the vibrator holding member 105 and the pressing mechanism holding member 107 prevent the rollers 108a and 108b from being removed in the one assembling direction with respect to the other.

  Next, the retaining structure of the vibrator holding member 105 and the pressing mechanism holding member 107 will be described. Here, in the state of FIG. 4B, it is assumed that the vibrator holding member 105 is pulled out relatively to the pressing mechanism holding member 107 in the negative direction of the Z axis. At this time, when the vibrator holding member 105 moves by a fixed amount in the negative direction of the Z axis, the retaining portions 105a and 105b of the vibrator holding member 105 abut on the rollers 108a and 108b, respectively. Thereafter, the vibrator holding member 105 moves in the negative direction of the Z-axis by dragging the rollers 108a and 108b. When the vibrator holding member 105 further moves by a fixed amount in this state, the retaining portions 105a and 105b abut on the retaining portions 107a and 107b of the pressing mechanism retaining member 107 via the rollers 108a and 108b, respectively. As a result, the movement of the transducer holding member 105 is restricted.

  Further, in the state of FIG. 4B, it is assumed that the pressing mechanism holding member 107 is pulled out relative to the vibrator holding member 105 in the positive direction of the Z axis. At this time, when the pressing mechanism holding member 107 moves by a predetermined amount in the positive direction of the Z axis, the retaining portions 107a and 107b of the pressing mechanism holding member 107 abut on the rollers 108a and 108b, respectively. Thereafter, the pressing mechanism holding member 107 moves in the positive direction of the Z axis by dragging the rollers 108a and 108b. When the pressing mechanism holding member 107 is further moved by a fixed amount in this state, the retaining portions 107a and 107b abut on the retaining portions 105a and 105b of the vibrator holding member 105 via the rollers 108a and 108b, respectively. As a result, the movement of the pressing mechanism holding member 107 is restricted.

  As described above, the retaining portions of the vibrator holding member 105 and the pressing mechanism holding member 107 are formed such that at least a part thereof overlaps the rollers 108a and 108b when viewed in the Z-axis direction. With such a configuration, in the present embodiment, the retaining portions of the vibrator holding member 105 and the pressing mechanism holding member 107 prevent the rollers 108 a and 108 b from falling off, and the vibrator holding member 105 and the pressing mechanism holding member And 107 to hold it out.

  Further, the positive side of the Z axis of the retaining portions 105a and 105b is chamfered at an angle of 45 degrees, and the negative side is chamfered to a curved surface. When the pressing mechanism holding member 107 assembled with the rollers 108a and 108b is assembled to the vibrator holding member 105 from the positive side of the Z axis, the retaining portions 105a and 105b push the rollers 108a and 108b apart in the X axis direction. At this time, the plate spring 109 is elastically deformed in the X-axis direction so as to retract from the retaining portion 105 b. Thus, the roller 108 b can ride over the retaining portion 105 b.

  Next, the configuration of the retaining portion will be described. FIG. 5A shows a side cross-sectional view of the pressing mechanism holding member 107 in a state in which the rollers 108a and 108b and the plate spring 109 are incorporated. FIG.5 (b) is an enlarged view of F area | region of FIG. 5 (a).

  As shown in FIG. 5B, the retaining portion 107b of the pressing mechanism holding member 107 is provided on the negative side (arrow H side) of the Z axis. The plate spring 109 is incorporated and held in the pressing mechanism holding member 107 from the side (the positive side of the Z axis, the arrow G side) opposite to the side where the retaining portion 107b is provided. That is, the plate spring 109 is held so as to be in order of the plate spring 109 and the retaining portion 107b along the assembling direction of the pressing mechanism holding member 107 (the negative direction of the Z axis). With such a configuration, the leaf spring 109 and the retaining portion 107b do not inhibit each other.

  FIG. 6 is a side cross-sectional view of the vibrator holding member 105 in a state in which the vibrator 104 is incorporated. As shown in FIG. 6, the vibrator 104 is assembled from the negative side (arrow J side) of the Z axis. The retaining portions 105a and 105b of the vibrator holding member 105 are provided on the opposite side (the positive side of the Z axis, the arrow I side) to the side where the vibrator 104 is assembled. The vibrator holding member 105 is assembled to the pressure mechanism holding member 107 on the positive side of the Z axis. As a result, the positions of the vibrator 104, the vibrator holding member 105, and the pressing mechanism holding member 107 on the X axis can be overlapped, and an increase in the size in the X axis direction can be prevented.

  As described above, the oscillatory wave motor 3 according to the present embodiment prevents the rollers 108a and 108b required for connection from coming off while connecting with no rattling, the vibrator holding member 105, and the pressing mechanism holding member 107. It is possible to prevent Therefore, an increase in size of the vibration wave motor 3 as a whole can be suppressed.

  In the present embodiment, the plate spring 109 is incorporated into the pressing mechanism holding member 107, but may be incorporated into one of the vibrator holding members 105. In this case, the plate spring 109 is held in order of the plate spring 109 and the retaining portions 105a and 105b along the assembling direction (the positive direction of the Z axis) of the vibrator holding member 105.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the present invention.

3 Vibration wave motor 101 Friction member (sliding member)
104 vibrator 105 vibrator holding member (first or second holding member)
105b Retaining part (first or second retaining part)
107 Pressurizing mechanism holding member (first or second holding member)
107b Retaining part (first or second retaining part)
108b roller (first rolling member)
109 leaf spring (biasing member)
111 Pressure transmission member (transmission member)
116 Means of connection

Claims (16)

A vibrator,
A transmission member for transmitting to the vibrator a pressing force for pressing the vibrator against a sliding member in contact with the vibrator;
A first holding member for holding one of the vibrator and the transmission member;
A second holding member for holding the other of the vibrator and the transmission member;
Connecting means for connecting the first and second holding members;
A vibration wave motor, wherein the vibrator and the sliding member move relative to each other by vibration generated in the vibrator,
The connection means includes a first rolling member for relatively moving the first and second holding members in the direction of the pressing force, and the parallel movement direction of the vibrator and the sliding member. And a biasing member for biasing the first rolling member,
The first holding member includes a first retaining portion for retaining the first rolling member.
The second holding member includes a second retaining portion for retaining the first rolling member.
The second holding member is assembled to the first holding member from the side having the second retaining portion,
The first retaining member prevents removal of the first rolling member toward the mounting direction of the first holding member with respect to the second holding member.
2. The vibration wave motor according to claim 1, wherein the second retaining member prevents removal of the first rolling member toward the mounting direction of the second holding member with respect to the first holding member. The first holding member holds the vibrator.
The first retaining portion is provided on the side opposite to the side holding the vibrator,
The vibration wave motor according to claim 1, wherein the first holding member is assembled to the second holding member from the side having the first retaining portion. It further comprises pressure means for generating the pressure force,
The oscillatory wave motor according to claim 1 or 2, wherein a plurality of the pressurizing means are disposed apart from each other so as to surround the vibrator. A vibrator,
A transmission member for transmitting to the vibrator a pressing force for pressing the vibrator against a sliding member in contact with the vibrator;
A first holding member for holding one of the vibrator and the transmission member;
A second holding member for holding the other of the vibrator and the transmission member;
Connecting means for connecting the first and second holding members;
A vibration wave motor, wherein the vibrator and the sliding member move relative to each other by vibration generated in the vibrator,
The connection means includes a first rolling member for relatively moving the first and second holding members in the direction of the pressing force, and the parallel movement direction of the vibrator and the sliding member. And a biasing member for biasing the first rolling member,
The first holding member includes a first retaining portion for retaining the first rolling member.
The second holding member includes a second retaining portion for retaining the first rolling member.
The first holding member holds the vibrator.
The first retaining portion is provided on the side opposite to the side holding the vibrator,
The first holding member is assembled to the second holding member from the side having the first retaining portion,
The first retaining member prevents removal of the first rolling member toward the mounting direction of the first holding member with respect to the second holding member.
2. The vibration wave motor according to claim 1, wherein the second retaining member prevents removal of the first rolling member toward the mounting direction of the second holding member with respect to the first holding member. It further comprises pressure means for generating the pressure force,
5. The oscillatory wave motor according to claim 4, wherein a plurality of the pressurizing means are disposed apart from each other so as to surround the vibrator. A vibrator,
Pressing means for generating a pressing force for pressing the vibrator against a sliding member in contact with the vibrator;
A transmission member for transmitting the pressure to the vibrator;
A first holding member for holding one of the vibrator and the transmission member;
A second holding member for holding the other of the vibrator and the transmission member;
Connecting means for connecting the first and second holding members;
A vibration wave motor, wherein the vibrator and the sliding member move relative to each other by vibration generated in the vibrator,
A plurality of the pressure means are spaced apart so as to surround the vibrator, and
The connection means includes a first rolling member for relatively moving the first and second holding members in the direction of the pressing force, and the parallel movement direction of the vibrator and the sliding member. And a biasing member for biasing the first rolling member,
The first holding member includes a first retaining portion for retaining the first rolling member.
The second holding member includes a second retaining portion for retaining the first rolling member.
The first retaining member prevents removal of the first rolling member toward the mounting direction of the first holding member with respect to the second holding member.
2. The vibration wave motor according to claim 1, wherein the second retaining member prevents removal of the first rolling member toward the mounting direction of the second holding member with respect to the first holding member. The second holding member holds the transmission member.
The oscillatory wave motor according to any one of claims 1 to 6, wherein the biasing member is held by the second holding member.   The first rolling member is in contact with the first holding member at the center side of the vibrator in the relative movement direction of the vibrator and the sliding member, and the opposite side to the center side of the vibrator The oscillatory wave motor according to any one of claims 1 to 7, wherein the oscillatory wave motor abuts on the biasing member. In the relative movement direction of the vibrator and the sliding member, the center side of the vibrator is in contact with the first holding member, and the opposite side to the center side of the vibrator is in contact with the second holding member. The oscillatory wave motor according to any one of claims 1 to 8, further comprising a second rolling member in contact therewith.   The vibration wave motor according to any one of claims 1 to 9, wherein a direction of the pressing force is orthogonal to a relative movement direction of the vibrator and the sliding member. The first holding member holds the vibrator.
The biasing force of the biasing member is set to be larger than an inertial force applied to the first holding member when the vibrator and the sliding member move relative to each other. 11. An oscillatory wave motor according to any one of Items 1 to 10.   The first and second retaining portions are provided such that at least a part thereof overlaps with the first rolling member when viewed from the direction of the pressure force. The vibration wave motor according to any one of the above.   The oscillatory wave motor according to any one of claims 1 to 12, wherein the biasing member is a leaf spring.   The oscillatory wave motor according to any one of claims 1 to 13, wherein the rolling member is a cylindrical roller.   The vibrator according to any one of claims 1 to 14, wherein the vibrator includes a vibrating plate in contact with the sliding member and a piezoelectric element that excites ultrasonic vibration by applying a voltage. Vibration wave motor. An electronic device comprising the vibration wave motor according to any one of claims 1 to 15.