JP2018061399A - Vibration wave motor and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration wave motor capable of being coupled without increasing size and rattling.SOLUTION: A vibration wave motor includes: an oscillator; a transmission member that transmits an applied pressure to the oscillator; a first holding member holding the oscillator; a second holding member holding the transmission member; and coupling means of coupling the first and second holding members. In the vibration wave motor, the oscillator and a slide member are relatively moved by the oscillation generated in the oscillator. The coupling means comprises: a rolling motion member for relatively moving the first holding member to a direction of the applied pressure; and an energize member that energizes a relative movement direction of the oscillator and the slide member and the rolling motion member in parallel. Each of the first and second holding members comprises first and second stopping parts for preventing the rolling motion from pulling out. The first and second stopping parts prevents the rolling motion from pulling out to an assembling direction side of the first holding member to the second holding member, and prevents the rolling motion from pulling out to the assembling direction side of the second holding member to the first holding member.SELECTED DRAWING: Figure 4

Description

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

  The vibration wave motor is driven by pressurizing a sliding member that is periodically vibrated by applying a high-frequency voltage to the sliding member and bringing it into frictional contact. In the vibration wave motor of Patent Document 1, the vibrator can be moved in the pressurizing direction with respect to the holding member, but is connected without play in the traveling direction. In order to realize such a configuration, the holding member has a two-body structure, and the two members are connected via a rolling member.

Japanese Patent No. 5969976

  However, the vibration wave motor of Patent Document 1 needs to have both a retaining structure that prevents the rolling member from falling off and a retaining structure that prevents the two members of the holding member from falling off. The overall size will increase.

  In view of such a problem, an object of the present invention is to provide a vibration wave motor and an electronic device that can be connected without backlash without being increased in size.

  A vibration wave motor according to one aspect of the present invention includes a vibrator, a transmission member that transmits pressure applied to the vibrator against a sliding member in contact with the vibrator, and the transmission member. A first holding member that holds one of the vibrator and the transmission member, a second holding member that holds the other of the vibrator and the transmission member, and a connection that connects the first and second holding members And a vibration wave motor in which the vibrator and the sliding member move relative to each other by vibration generated in the vibrator, wherein the coupling means includes the first and second holding members. And a biasing member for biasing the first rolling member in parallel with the relative movement direction of the vibrator and the sliding member. And the first holding member is detached from the first rolling member. The second retaining member includes a second retaining portion for retaining the first rolling member, and the first retaining portion includes: The first rolling member is prevented from coming off toward the assembly direction side of the first holding member with respect to the second holding member, and the second retaining portion is the first holding member with respect to the first holding member. It is characterized in that the first rolling member is prevented from coming off toward the assembly direction side of the two holding members.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration wave motor and electronic device which can be connected without looseness without enlarging can be provided.

It is sectional drawing of an imaging device provided with the vibration wave motor which concerns on embodiment of this 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 the assembly | attachment of the principal part. 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 figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a cross-sectional view of an imaging apparatus including 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. Inside the imaging lens unit 1, a vibration wave motor 3 and a focusing lens 4 attached to the vibration wave motor 3 are arranged. An image sensor 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 during photographing. The subject image is formed at the position of the image sensor 5, and the image sensor 5 generates a focused image. In the present embodiment, the vibration wave motor 3 is mounted on the imaging apparatus, but 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 can be attached to and detached 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 a direction orthogonal to the optical axis O. The imaging lens unit 1 is configured integrally with the camera body 2 in the present embodiment, but may be a lens that is detachably attached to the camera body 2.

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

  The friction member (sliding member) 101 and the guide support member (rail plate) 113 are fixed to the base plate 112 with screws or the like. The pressurizing spring (pressurizing means) 110 connects the pressure transmission member (transmission member) 111 and the driving force transmission member (movable plate) 115 at four positions via respective spring hooks, and the vibrator 104 A pressing force is applied to cause frictional contact with the friction member 101. In this embodiment, the pressure spring 110 applies pressure to the vibrator 104 at four positions. However, it is possible that a plurality of pressure means can apply pressure to the vibrator 104 at different positions. For example, the present invention is not limited to this. The pressure applied by the pressure 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 with an adhesive or the like. The diaphragm 102 includes a contact portion that is a protruding portion provided on a surface opposite to the surface on the pressure transmission member 111 side, and the contact portion is a friction member in a state in which the contact portion is pressurized by the pressure of the pressure spring 110. 101 is contacted. The piezoelectric element 103 excites ultrasonic vibration by applying a voltage. A resonance phenomenon occurs in the vibrator 104 by exciting ultrasonic vibration in the piezoelectric element 103 in a state where the vibration plate 102 and the piezoelectric element 103 are bonded. At this time, two types of standing waves are generated in the vibrator 104, and a 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 pressurizing mechanism holding member 107, which is a holding housing for holding the pressure transmission member 111, is a vibrator holding member 105 via cylindrical rollers (rolling members) 108 a and 108 b and a leaf spring (biasing member) 109. Connected to The pressurizing mechanism holding member 107 includes a power take-out unit (not shown) connected to the driven body.

  The elastic member 106 is disposed between the piezoelectric element 103 and the pressure transmission member 111. The elastic member 106 prevents the piezoelectric element 103 from coming into direct contact with the pressurizing unit included in the pressure transmission member 111 in order to prevent the piezoelectric element 103 from being damaged.

  The pressure mechanism holding member 107 and the movable plate 115 are fixed with screws or the like. The movable plate 115 has three V-groove moving side guides, and rolling balls 114a to 114c are fitted into the moving side guides, respectively. The rail plate 113 is formed with three groove-shaped fixed side guide portions. The rolling balls 114 a to 114 c are sandwiched between a moving side guide portion formed on the movable plate 115 and a fixed side guide portion formed on the rail plate 113. In the present embodiment, two fixed-side guide portions formed on the rail plate 113 are two V-grooves and one is a bottomed flat groove, but the rolling balls 114a to 114c can roll. Any groove may be used.

  In this embodiment, in order to reduce the thickness of the vibration wave motor 3 in the Z-axis direction, a plurality of pressure springs 110 are arranged apart from each other so as to surround the vibrator 104 rather than being stacked on the vibrator 104. Yes. In the present embodiment, the pressurizing spring 110 can be made smaller by generating the pressurizing force with the plurality of pressurizing springs 110. The pressure spring 110 presses the vibrator 104 against the friction member 101 in the direction of arrow C (the direction of the applied pressure, the pressing direction) via the elastic member 106, so that the contact portion of the vibration plate 102 is in contact with the pressure spring 110. The friction member 101 is contacted in a state of being pressurized by the applied pressure. When a voltage is applied to the piezoelectric element 103 in this state, a 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 pressure mechanism holding member 107, the pressure spring 110, the pressure transmission member 111, and the movable plate 115 has an optical axis O. It becomes possible to move relative to the friction member 101.

  Next, the connecting mechanism 116 that connects the vibrator holding member 105 and the pressure mechanism holding member 107 will be described. The coupling mechanism 116 includes rollers 108 a and 108 b and a leaf spring 109. 2 and 3, the rollers 108a and 108b are disposed between the vibrator holding member 105 and the pressure mechanism holding member 107 so as to be movable along the Z axis. The leaf spring 109 is disposed between the pressure 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 urges the vibrator holding member 105 in the direction of arrow A and urges the pressurizing mechanism holding member 107 in the direction of arrow B via the roller 108b. Accordingly, the roller (second rolling member) 108 a is sandwiched between the vibrator holding member 105 and the pressure mechanism holding member 107.

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

  In the present embodiment, the roller 108a contacts the vibrator holding member 105 on the center side (side approaching the center of the vibrator 104), and the pressure mechanism holding member on the outside (side away from the center of the vibrator 104). 107 abuts. The roller 108b contacts the vibrator holding member 105 on the center side, and contacts the leaf spring 109 held by the pressure mechanism holding member 107 on the outer side. Since the pressurizing mechanism holding member 107 holds the leaf spring 109, the piezoelectric element 103, the elastic member 106, the pressurizing force transmitting member 111, and the like are stacked and arranged in the center of the vibrator 104 without impairing the assembling property. Interference with other parts can be avoided. Therefore, the plurality of pressure springs 110 can be arranged close to the central portion of the vibrator 104, and the outer size of the moving unit 120 in plan view with respect to the XY plane can be reduced.

  Further, the urging force of the leaf spring 109 is set to be larger than the inertial force due to acceleration / deceleration generated when the driving of the vibrator 104 is started and stopped. Thereby, since the relative displacement along the moving direction of the moving unit 120 due to the inertial force during driving does not occur in the vibrator 104 and the vibrator holding member 105, stable drive control can be realized.

  In this embodiment, the coupling mechanism 116 includes the rollers 108a and 108b and the leaf spring 109, but the present invention is not limited to this as long as it includes a rolling member and a biasing member. For example, a ball or the like may be used instead of the roller. In this embodiment, the leaf spring 109 is used as the urging member constituting the coupling mechanism 116. However, the play between the vibrator holding member 105 and the pressure mechanism holding member 107 can be eliminated. The present invention is not limited to this as long as it is a force member.

  Next, assembly of the vibrator holding member 105 and the pressure mechanism holding member 107 will be described with reference to FIG. FIG. 4 is a view for explaining assembly of the vibrator holding member 105 and the pressure mechanism holding member 107. FIG. 4A is a side sectional view before assembly, and FIG. 4B is a side sectional view after assembly. 4C and 4D are enlarged views of the D region and the E region in FIG. 4B, respectively. As shown in FIG. 4A, the vibrator 104 is assembled to the vibrator holding member 105 before assembly. Further, rollers 108 a and 108 b and a leaf spring 109 are assembled to the pressurizing 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 certain amount in the positive direction of the Z axis, the roller 108a comes into contact with the retaining portion 105a formed on the vibrator holding member 105, and the movement is restricted. Further, when the roller 108a moves by a certain amount in the negative direction of the Z axis, the roller 108a comes into contact with the retaining portion 107a formed on the pressure mechanism holding member 107, and the movement is restricted. With such a configuration, the roller 108a is prevented from falling off.

  As shown in FIG. 4D, when the roller 108b moves by a certain amount in the positive direction of the Z axis, the roller 108b comes into contact with the retaining portion 105b formed on the vibrator holding member 105, and the movement is restricted. Further, when the roller 108b moves by a certain amount in the negative direction of the Z-axis, the roller 108b comes into contact with the retaining portion 107b formed on the pressure mechanism holding member 107, and the movement is restricted. With such a configuration, the roller 108b is prevented from falling off.

  Accordingly, the retaining portions 105 a and 105 b prevent the rollers 108 a and 108 b from slipping toward the assembly direction side of the vibrator holding member 105 with respect to the pressure mechanism holding member 107. Further, the retaining portions 107 a and 107 b prevent the rollers 108 a and 108 b from coming off toward the assembly direction side of the pressurizing mechanism holding member 107 with respect to the vibrator holding member 105. In other words, the retaining portion formed on one of the vibrator retaining member 105 and the pressure mechanism retaining member 107 prevents the rollers 108a and 108b from slipping toward one assembly direction with respect to the other.

  Next, a retaining structure for the vibrator holding member 105 and the pressure 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 in the negative direction of the Z axis relative to the pressurizing mechanism holding member 107. At this time, when the vibrator holding member 105 moves by a certain amount in the negative direction of the Z axis, the retaining portions 105a and 105b of the vibrator holding member 105 come into contact with the rollers 108a and 108b, respectively. Thereafter, the vibrator holding member 105 moves in the negative direction of the Z axis while dragging the rollers 108a and 108b. In this state, when the vibrator holding member 105 further moves by a certain amount, the retaining portions 105a and 105b come into contact with the retaining portions 107a and 107b of the pressure mechanism retaining member 107 through the rollers 108a and 108b, respectively. As a result, the movement of the vibrator holding member 105 is restricted.

  Further, in the state of FIG. 4B, it is assumed that the pressurizing mechanism holding member 107 is pulled out in the positive direction of the Z axis relative to the vibrator holding member 105. At this time, when the pressure mechanism holding member 107 moves by a certain amount in the positive direction of the Z axis, the retaining portions 107a and 107b of the pressure mechanism holding member 107 come into contact with the rollers 108a and 108b, respectively. Thereafter, the pressure mechanism holding member 107 moves in the positive direction of the Z axis by dragging the rollers 108a and 108b. In this state, when the pressurizing mechanism holding member 107 further moves by a certain amount, the retaining portions 107a and 107b come into contact with the retaining portions 105a and 105b of the vibrator retaining member 105 through the rollers 108a and 108b, respectively. As a result, the movement of the pressure mechanism holding member 107 is restricted.

  As described above, each retaining portion of the vibrator holding member 105 and the pressure mechanism holding member 107 is formed so that at least a part thereof overlaps the rollers 108a and 108b when viewed from the Z-axis direction. With such a configuration, in the present embodiment, the retaining portions of the vibrator holding member 105 and the pressure mechanism holding member 107 are configured to prevent the rollers 108a and 108b from coming off, and the vibrator holding member 105 and the pressure mechanism holding member. 107 is retained.

  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 into a curved surface. When the pressure mechanism holding member 107 with the rollers 108a and 108b assembled 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 in the X axis direction, respectively. At this time, the leaf spring 109 is elastically deformed in the X-axis direction so as to be retracted from the retaining portion 105b. Thereby, the roller 108b can get over the retaining portion 105b.

  Next, the configuration of the retaining portion will be described. FIG. 5A shows a side cross-sectional view of the pressure mechanism holding member 107 in a state where the rollers 108a and 108b and the leaf spring 109 are incorporated. FIG. 5B is an enlarged view of the F region in FIG.

  As shown in FIG. 5B, the retaining portion 107b of the pressure mechanism holding member 107 is provided on the negative side (arrow H side) of the Z axis. The leaf spring 109 is incorporated and held in the pressurizing mechanism holding member 107 from the side opposite to the side where the retaining portion 107b is provided (the positive side of the Z axis, the arrow G side). In other words, the leaf spring 109 is held in the order of the leaf spring 109 and the retaining portion 107b along the assembly direction of the pressure 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 interfere with each other.

  FIG. 6 is a side sectional view of the vibrator holding member 105 in a state where 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 105 a and 105 b of the vibrator holding member 105 are provided on the side opposite to the side on which the vibrator 104 is assembled (the positive side of the Z axis, the arrow I side). The vibrator holding member 105 is assembled to the pressurizing 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 pressure mechanism holding member 107 on the X axis can be overlapped, and an increase in size in the X axis direction can be prevented.

  As described above, the vibration wave motor 3 according to the present embodiment can prevent the rollers 108a and 108b from being detached, the vibrator holding member 105, and the pressurizing mechanism holding member 107 while performing the connection without backlash. Can be prevented. For this reason, the size of the vibration wave motor 3 as a whole can be prevented from increasing.

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

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

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 Connecting means

Claims (14)

A vibrator,
A transmission member for transmitting a pressing force for pressurizing the vibrator to the sliding member in contact with the vibrator;
A first holding member that holds one of the vibrator and the transmission member;
A second holding member that holds the other of the vibrator and the transmission member;
Connecting means for connecting the first and second holding members;
A vibration wave motor in which the vibrator and the sliding member move relatively by vibration generated in the vibrator;
The connecting means includes a first rolling member for relatively moving the first and second holding members in the direction of the applied pressure, and a parallel movement direction of the vibrator and the sliding member A biasing member that biases 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 portion prevents the first rolling member from slipping toward the assembly direction side of the first holding member with respect to the second holding member,
The vibration wave motor, wherein the second retaining portion prevents the first rolling member from slipping toward the assembly direction side of the second retaining member with respect to the first retaining member. The second holding member holds the transmission member,
The vibration wave motor according to claim 1, wherein the urging member is held by the second holding member.   The vibration wave motor according to claim 1, wherein the second holding member is assembled to the first holding member from the side having the second retaining portion. The first holding member holds the vibrator,
The first retaining portion is provided on the side opposite to the side holding the vibrator,
4. The vibration wave according to claim 1, wherein the first holding member is assembled to the second holding member from the side having the first retaining portion. 5. motor.   The first rolling member is in contact with the first holding member on the center side of the vibrator in the relative movement direction of the vibrator and the sliding member, and is opposite to the center side of the vibrator. The vibration wave motor according to claim 1, wherein the vibration wave motor is in contact with the urging member.   A second rolling member that contacts the first holding member on the center side of the vibrator and abuts on the second holding member on the opposite side in the relative movement direction of the vibrator and the sliding member The vibration wave motor according to claim 1, further comprising: A pressurizing means for generating the pressurizing force;
The vibration wave motor according to any one of claims 1 to 6, wherein a plurality of the pressurizing units are arranged so as to surround the vibrator.   8. The vibration wave motor according to claim 1, wherein a direction of the pressure 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. Item 9. The vibration wave motor according to any one of Items 1 to 8.   10. The first and second retaining portions are provided so that at least a part thereof overlaps the first rolling member when viewed from the direction of the applied pressure. The vibration wave motor according to any one of the above.   The vibration wave motor according to claim 1, wherein the biasing member is a leaf spring.   The vibration wave motor according to claim 1, wherein the rolling member is a cylindrical roller.   The said vibrator | oscillator is provided with the piezoelectric element which excites an ultrasonic vibration by applying the voltage and the diaphragm which contacts the said sliding member, It is any one of Claim 1 to 12 characterized by the above-mentioned. Vibration wave motor. An electronic apparatus comprising the vibration wave motor according to claim 1.