JP2017200366A - Vibration wave motor and electronic apparatus loading the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact vibration wave motor with an arrangement configuration of folding a flexible substrate to supply power to a vibrator.SOLUTION: The vibration wave motor includes: a vibrator; a slide member which contacts to the vibrator; a flexible substrate connected to the vibrator; and a moving member which is arranged on the opposite face side of the slide member to a contact surface to which the vibrator contacts, so as to move with the vibrator. The vibrator and the slide member relatively move by a vibration generated on the vibrator. The flexible substrate includes a bent part which is formed by being folded and has a varied formation position along the movement direction of the vibrator according to the movement of the vibrator. The bent part is formed between the slide member and the moving member.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vibration wave motor.

  2. Description of the Related Art Conventionally, a vibration wave motor (ultrasonic motor) is known in which a vibrator that periodically vibrates by applying a high-frequency voltage is pressed against a sliding member and the sliding member is relatively driven. Patent Document 1 discloses an ultrasonic motor in which a flexible substrate that feeds power to a vibrator is folded and arranged to smoothly drive the vibrator straightly.

  Japanese Patent No. 4333131

  However, the ultrasonic motor of Patent Document 1 needs to be provided with a dedicated member or space for disposing a flexible substrate, which increases the size. Therefore, it is difficult to reduce the size of the ultrasonic motor.

  In view of such a problem, an object of the present invention is to provide a vibration wave motor that can be reduced in size while providing a configuration in which a flexible substrate that feeds power to a vibrator is folded.

  The vibration wave motor according to one aspect of the present invention includes a vibrator, a sliding member that contacts the vibrator, a flexible substrate connected to the vibrator, and a contact of the sliding member that contacts the vibrator. A vibration member that is disposed on a surface opposite to the surface and moves together with the vibrator, wherein the vibrator and the sliding member move relatively by vibration generated in the vibrator. The flexible substrate includes a bent portion that is formed by folding and changes a position formed along a moving direction of the vibrator according to the movement of the vibrator. It is formed between the sliding member and the moving member.

  According to the present invention, it is possible to provide a vibration wave motor that can be reduced in size while providing a configuration in which a flexible substrate that feeds power to a vibrator is folded.

It is principal part sectional drawing of an electronic device provided with the ultrasonic motor which concerns on embodiment of this invention. 1 is a perspective view of an ultrasonic motor according to Embodiment 1. FIG. 1 is an exploded perspective view of an ultrasonic motor according to Embodiment 1. FIG. 1 is a cross-sectional view of a main part of an ultrasonic motor according to Embodiment 1. FIG. 1 is a front sectional view of an ultrasonic motor according to Embodiment 1. FIG. It is explanatory drawing of the arrangement | positioning method of a flexible substrate. 6 is a cross-sectional view of a main part of an ultrasonic motor according to Embodiment 2. FIG. 6 is a front sectional view of an ultrasonic motor according to Embodiment 2. FIG.

  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 a main part of a lens barrel that is an example of an electronic apparatus including an ultrasonic motor 1 that is a vibration wave motor according to an embodiment of the present invention. Since the lens barrel is substantially rotationally symmetric, only the upper half is shown in FIG. FIG. 1 shows a range barrel that can be attached to and detached from an imaging apparatus as an example of an electronic apparatus that includes an ultrasonic motor 1 that is a vibration wave motor according to an embodiment of the present invention. As an example, there is an imaging device in which a lens barrel is integrated.

  A lens barrel 3 is detachably attached to the camera body (imaging device) 2 via a mount 5, and an imaging element 4 is provided inside the camera body 2. A front barrel 7 holding the lens G1 and a rear barrel 8 holding the lens G3 are fixed to the fixed barrel 6 of the lens barrel 3. The lens holding frame 9 holds the lens G2 and is held by a guide bar 10 held by the front lens barrel 7 and the rear lens barrel 8 so as to be able to move straightly. The ground plate 115 of the ultrasonic motor 1 is formed with a flange portion (not shown) that is fixed to the rear barrel 8 with screws or the like.

  When the movable part including the vibrator holding member 102 of the ultrasonic motor 1 is driven, the driving force of the ultrasonic motor 1 is transmitted to the lens holding frame 9 via the vibrator holding member 102, and the lens holding frame 9 is moved to the guide bar 10. As a result, it moves straight in parallel with the optical axis O (x-axis).

  In the present embodiment, the ultrasonic motor 1 is mounted on the lens barrel 3 which is an electronic device, but the present invention is not limited to this. The ultrasonic motor 1 may be mounted on an electronic device different from the lens barrel or the imaging device.

  2 to 5 are a perspective view, an exploded perspective view, a cross-sectional view of a main part, and a top view, respectively, of the ultrasonic motor 1A of the present embodiment.

  The pressurizing spring (pressurizing means) 111 is connected to the pressurizing force transmitting member (transmitting member) 110 and the moving member 112 serving as a driving force transmitting member at four positions via connecting holding portions. A tension spring force is generated between the pressure transmission member 110 and the moving member 112, and the pressure transmission member 110 is pulled in the direction of arrow A by the tension spring force. The pressure transmission member 110 includes a pressurizing part 110a formed by a substantially hemispherical protrusion, and the elastic member 109 prevents the piezoelectric element 103 from being damaged by direct contact between the piezoelectric element 103 and the pressurizing part 110a. Between these members. The pressurizing spring 111 pressurizes the vibrator 100 in the direction of arrow A through these members. When the pressurizing spring 111 pressurizes the vibrator 100, the press contact portion 100a which is a protrusion provided on the surface of the vibrator 100 opposite to the surface on the pressure transmission member 110 side is a friction member (sliding member). 104 makes frictional contact. In this embodiment, the pressure spring 111 pressurizes the vibrator 100 at four positions. However, if a plurality of pressurizing members can pressurize the vibrator 100 at different positions, the present invention It is not limited to this. In this embodiment, a spring is used as the pressing means. However, the present invention is not limited to this as long as the vibrator 100 is pressed against the friction member 104.

  The vibrator 100 includes a diaphragm 101 and a piezoelectric element 103. The diaphragm 101 is fixed to the vibrator holding member 102 by welding or an adhesive. The piezoelectric element 103 is fixed to the diaphragm 101 with an adhesive or the like. A flexible substrate 150 is fixed to the piezoelectric element 103 to supply power. The piezoelectric element 103 excites ultrasonic vibration when a high frequency voltage is applied through the flexible substrate 150. The vibration plate 101 resonates by exciting the piezoelectric element 103 with ultrasonic vibration while the vibration plate 101 and the piezoelectric element 103 are bonded. That is, the vibrator 100 generates ultrasonic vibration when a high frequency voltage is applied through the flexible substrate 150. As a result, elliptical vibration is generated at the tip of the pressure contact portion 100 a of the vibrator 100.

  By changing the frequency and phase of the high-frequency voltage applied to the piezoelectric element 103, it is possible to appropriately change the rotation direction and the ellipticity ratio to generate a desired vibration. Therefore, a driving force for moving the pressure contact portion 100a of the vibrator 100 relative to the friction contact surface 104a of the friction member 104 is generated, thereby generating a driving force to move the vibrator 100 with respect to the friction member 104 in the x-axis (optical axis O). ) Can be moved along. The relative movement direction of the vibrator 100 is orthogonal to the pressing direction by the pressing spring 111.

  Between the vibrator holding member 102 and the holding housing 105 holding the pressure transmission member 110, rollers (rolling members) 106a and 106b and a plate spring (biasing member) 107 having a predetermined elasticity are formed. The connecting means 116 is incorporated. The roller 106a is sandwiched between the leaf spring 107 and the vibrator holding member 102 so as to be movable in the arrow A direction (the pressing direction of the pressing spring 111). The leaf spring 107 is disposed between the holding housing 105 and the roller 106a and has a biasing force parallel to the x axis. That is, the leaf spring 107 biases the vibrator holding member 102 in the arrow B direction via the roller 106a, and biases the holding housing 105 in the arrow C direction. Therefore, the roller 106 b is sandwiched between the vibrator holding member 102 and the holding housing 105.

  By configuring as described above, the connecting means 116 does not generate backlash in the direction parallel to the x axis (the moving direction of the vibrator 100), but in the direction of the arrow A (the pressing direction of the pressing spring 111). Hardly generates sliding resistance by the action of the rollers 106a and 106b.

  Further, the urging force of the leaf spring 107 is set to be larger than the inertial force due to acceleration / deceleration generated when the holding housing 105 and the driven part are started and stopped. By setting in this way, the vibrator 100, the vibrator holding member 102, and the holding housing 105 do not generate relative displacement along the moving direction of the vibrator 100 due to the inertial force during driving. Can be realized.

  In this embodiment, the rollers 106a and 106b are used as rolling members constituting the connecting means 116, but the present invention is not limited to this as long as it can move in the direction of arrow A. For example, a ball or the like may be used instead of the roller. In this embodiment, the leaf spring 107 is used as the urging member constituting the connecting means 116. However, the urging member can eliminate the play between the vibrator holding member 102 and the holding housing 105. The present invention is not limited to this.

  The moving member 112 is fixed to the holding housing 105 by bonding or screwing, and transmits the driving force generated by the vibrator 100. That is, the moving member 112 is connected to the vibrator 100 via the vibrator holding member 102 and the holding housing 105. The moving member 112 is formed with a guide portion 112 a for guiding the flexible substrate 150. In addition, rolling balls (guide members) 114a to 114c are fitted in the moving member 112, respectively, and three V grooves (moving side guide portions) for guiding the holding housing 105 along the x axis (optical axis O). Is formed. The plate member (guide member) 113 is disposed below the friction member 104 (the surface side opposite to the friction contact surface 104a of the friction member 104). The friction member 104 and the plate member 113 are fixed to the main plate 115 with screws or the like. The plate member 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 moving member 112 and a fixed side guide portion formed on the plate member 113. By these members, the holding housing 105 is supported so as to advance and retreat along the x axis (optical axis O) according to the movement of the vibrator 100. At this time, the moving member 112 also moves along the x-axis (optical axis O). That is, the moving member 112 is movably held by a guide member configured by the plate member 113 and the rolling balls 114a to 114c. In this embodiment, the three fixed guide portions formed on the plate member 113 are two V-grooves and one is a bottomed flat groove, but the rolling balls 114 are rollable grooves. I just need it.

  In this embodiment, in order to reduce the thickness of the ultrasonic motor 1A in the z-axis direction, the pressure spring 111 is not stacked on the top of the vibrator 100, but is arranged at four positions so as to surround the vibrator 100. Yes. In the present embodiment, the pressurizing spring 111 can be made smaller by generating the pressurizing force by the plurality of pressurizing springs 111. Further, the vibrator 100 is preferably pressed uniformly against the friction member 104. Therefore, in this embodiment, when the ultrasonic motor 1 </ b> A is viewed in plan with respect to the XY plane, the pressure spring 111 is disposed so as to surround the pressure contact portion 100 a of the vibrator 100.

  The coupling means (rollers 106a and 106b and leaf spring 107) 116 are arranged between the pressure springs 111 (from the pressure spring 111) in a direction parallel to the x axis (moving direction of the vibrator 100) and a direction parallel to the y axis. Is also located at a position close to the press contact part 100a. That is, the pressurizing spring 111 is disposed outside the coupling means 116 around the vibrator 100 in the direction parallel to the x-axis and the direction parallel to the y-axis. Here, the direction parallel to the y-axis is a direction orthogonal to the moving direction of the vibrator 100 and the pressing direction of the pressing spring 111. Note that it is not necessary to be strictly orthogonal, and even if it is shifted by several degrees, it is regarded as being substantially orthogonal (substantially orthogonal).

  The flexible substrate 150 needs to be arranged so as not to hinder the relative movement of the vibrator 100 with respect to the friction member 104. In the present embodiment, as shown in FIG. 4, the flexible substrate 150 is folded and disposed. The flexible substrate 150 includes a bent portion 150 a formed by folding back and a connecting portion 150 b connected to the piezoelectric element 103. Further, the flexible substrate 150 is arranged so that the plate member 113 is sandwiched between the friction member 104 and the moving member 112. When the distance between the friction member 104 and the moving member 112 is short, the radius of the bent portion 150a becomes small, and the bent portion 150a may be damaged. When damage is applied to the bent portion 150a, the flexible substrate 150 may cause disconnection or the like. Therefore, it is preferable to set the radius of the bent portion 150a as large as possible. However, if the distance between the friction member 104 and the moving member 112 is simply increased, the ultrasonic motor 1A is increased in size. Therefore, in this embodiment, as shown in FIG. 5, the flexible substrate 150 can be arranged on the friction member 104 on the surface opposite to the friction contact surface 104 a that frictionally contacts the pressure contact portion 100 a of the vibrator 100. A concave shape 104b is formed. By forming the concave shape 104b in the friction member 104, the bending force applied to the bent portion 150a can be reduced. In this embodiment, the concave shape 104b is formed in the friction member 104. However, the present invention is not limited to this as long as the flexible substrate 150 can be disposed.

  Hereinafter, a method for arranging the flexible substrate 150 will be described with reference to FIG. FIG. 6 is an explanatory diagram of a method for arranging the flexible substrate 150. In FIG. 6, only representative members are shown for the sake of clarity.

  First, as shown in FIG. 6A, the flexible substrate 150 is pulled out in a direction orthogonal to the relative movement direction of the vibrator 100 (a direction parallel to the y-axis) with the connection portion 150 b connected to the piezoelectric element 103. It is. Next, the flexible substrate 150 is bent along the broken line D in FIG. 6A to be in the state shown in FIG. At this time, the flexible substrate 150 is disposed so as to pass between the rolling balls 114a and 114b. When the vibrator 100 moves, the rolling balls 114a and 114b move along the x axis (optical axis O), but are arranged so as not to interfere with the flexible substrate 150 in the moving range.

  Next, the flexible substrate 150 is bent along the broken line E in FIG. 6B and is in the state shown in FIG. At this time, the flexible substrate 150 is disposed along the guide portion 112 a formed on the moving member 112. In addition, a second end different from the connection portion 150 b which is the first end of the flexible substrate 150 extends in the direction of arrow F.

  Next, the flexible substrate 150 is folded back so that a bent portion 150a is formed by a broken line G in FIG. 6C, and becomes a U-turn shape shown in FIGS. 6D and 6E. FIG. 6E is a front view of the ultrasonic motor 1A in the state of FIG. The second end of the flexible substrate 150 extends in the arrow H direction. When the vibrator 100 moves relative to the friction member 104, the position where the bent portion 150a is formed also moves. Further, the flexible substrate 150 is disposed so as to pass between the rolling balls 114b and 114c. When the vibrator 100 moves, the rolling balls 114b and 114c move along the x-axis (optical axis O) and do not interfere with the flexible substrate 150.

  As described above, the flexible substrate 150 is folded back and disposed between the friction member 104 and the moving member 112 in the z-axis direction, so that the relative movement of the vibrator 100 with respect to the friction member 104 is not hindered. In addition, by arranging the flexible substrate 150 in the existing space in this way, the ultrasonic motor 1A can be reduced in size.

  7 and 8 are a cross-sectional view and a front cross-sectional view of the main part of the ultrasonic motor 1B of the present embodiment, respectively. In the ultrasonic motor 1B of the present embodiment, the components other than the friction member (sliding member) 204 and the plate member (guide member) 213 are not changed in configuration and configuration such as the ultrasonic motor 1A of the first embodiment. Description is omitted. Regarding the reference numbers of the respective parts, the parts other than the friction member 204 and the plate member 213 are the same as those in the first embodiment.

  As shown in FIG. 7, in this embodiment, the friction member 204 is not provided with a concave shape. Further, the friction member 204 and the plate member 213 are disposed close to each other. Therefore, in the first embodiment, the flexible substrate 150 is arranged so that the plate member 113 is sandwiched between the moving member 112 and the friction member 104, but in this embodiment, the flexible substrate 150 is disposed between the plate member 213 and the moving member 112. Is arranged. That is, in this embodiment, the bent portion 150 a of the flexible substrate 150 is disposed between the plate member 213 and the moving member 112. As described above, after the plate member 213, which is another member, is disposed between the friction member 204 and the moving member 112, the bent portion 150 a of the flexible substrate 150 may be disposed between the plate member 213 and the moving member 112. Is possible.

  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.

1, 1A, 1B Ultrasonic motor (vibration wave motor)
100 vibrator 104 friction member (sliding member)
112 Moving member 150 Flexible substrate 150a Bent part

Claims (8)

A vibrator,
A sliding member in contact with the vibrator;
A flexible substrate connected to the vibrator;
A sliding member that is disposed on the surface of the sliding member that is opposite to the contact surface that contacts the vibrator, and that moves together with the vibrator;
A vibration wave motor in which the vibrator and the sliding member move relatively by vibration generated in the vibrator;
The flexible substrate is formed by folding back, and includes a bent portion whose position is changed along the moving direction of the vibrator according to the movement of the vibrator,
The bending wave portion is formed between the sliding member and the moving member. A guide member that is disposed between the sliding member and the moving member and holds the moving member movably along the moving direction of the vibrator;
The vibration wave motor according to claim 1, wherein the flexible substrate is disposed so as to sandwich the guide member.   The vibration wave motor according to claim 2, wherein a concave shape in which the flexible substrate can be disposed is formed on a surface of the sliding member opposite to the contact surface. A guide member that is disposed between the sliding member and the moving member and holds the moving member movably along the moving direction of the vibrator;
The vibration wave motor according to claim 1, wherein the bent portion is formed between the guide member and the moving member. The guide member includes a plurality of rolling members,
5. The vibration wave motor according to claim 2, wherein the flexible substrate is disposed between the plurality of rolling members. 6.   The said vibrator | oscillator is provided with the piezoelectric element which excites an ultrasonic vibration by applying the vibration plate and voltage which contact the said sliding member, The Claim 1 characterized by the above-mentioned. Vibration wave motor.   The vibration wave motor according to claim 6, wherein the flexible substrate includes a connection portion connected to the piezoelectric element. An electronic apparatus comprising the vibration wave motor according to claim 1.