JP2550325Y2 - Vibration wave motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a vibration wave motor, and more particularly to a structure of a vibration wave motor utilizing vibration of a piezoelectric element, and more particularly to a structure of a motor support member and a terminal plate.

[0002]

2. Description of the Related Art Conventionally, an ultrasonic motor, which is a traveling wave type vibration wave motor using a traveling wave of a piezoelectric element, or converts longitudinal vibration of a piezoelectric element into elliptical vibration by arrangement of a piezoelectric body and structure of a vibrator. Various ultrasonic motors, which are vibration wave motors, have been proposed. In providing a compact motor with high drive efficiency in these ultrasonic motors, the structure of the support member of the vibrating body and the structure of the terminal for applying the drive voltage to the piezoelectric element have become problems, and various proposals have been made conventionally. ing.

Japanese Patent Application Laid-Open No. 61-106077 relates to an ultrasonic motor which is a traveling wave type vibration wave motor, and a terminal is provided on an auxiliary vibrator provided to support the motor. A power supply to the electrostrictive element (piezoelectric body) via the terminal. Japanese Patent Application Laid-Open No. 62-203571 also relates to a traveling-wave type ultrasonic motor, which includes a diaphragm adhered in a conductive state to a piezoelectric element, and a diaphragm attached to the diaphragm. The pressing plate and the moving plate are formed of a conductive member, and form one voltage application path for the piezoelectric element.

Japanese Patent Application Laid-Open No. 63-242184 also relates to a traveling wave type ultrasonic motor. In this motor, an elastic support arm which is a support member for supporting a piezoelectric element is provided. , the elastic support arms piezoelectric element electrode surface upper press contact slide is formed of a conductive member,
A drive voltage can be applied to the piezoelectric element via the support arm.

On the other hand, an ultrasonic motor utilizing the above-mentioned longitudinal vibration has a very high efficiency.
%, And its structure is simple, and in recent years, it has attracted more attention than other traveling wave type ultrasonic motors and the like.
The above-mentioned conventional longitudinal vibration motor drives a moving body by a vibrating body by combining longitudinal vibration and transverse vibration in a direction perpendicular to the longitudinal vibration. In order to resonate with lateral vibration using strong primary longitudinal vibration, most motors have a columnar shape, and the vibrating body is provided with a driving source such as a vertical or slippery motor. The piezoelectric body that has the effect is longitudinal vibration, or
It is located near the node of slip vibration.

[0006] There has also been proposed a structure in which a supporting member for supporting the vibrating body is fixed to a node of the vibration so as not to hinder the vibration. Further, an electric terminal for applying a driving voltage of the motor is provided separately from the support member near a central portion in the axial direction of the motor.

[0007]

The invention disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 61-106077 is a traveling wave type ultrasonic motor in which a terminal is provided on an auxiliary vibrator serving as a support member. In addition, the configuration is simplified. But,
In the traveling wave type ultrasonic motor, the vibrator does not have a mode of vibration, so in order not to hinder the vibration, it is necessary to make the supporting structure of the auxiliary vibrator to be a supporting member to have a low rigidity structure. Can not be held firmly,
Increase in size.

Further, Japanese Patent Application Laid-Open No. 62-203571,
The one disclosed in JP-A-63-242184 is also a traveling wave type, and has no vibration mode.
There is a problem that the support structure is complicated. On the other hand, in the case of the conventional ultrasonic motor using the longitudinal vibration, the electric terminals for applying the drive voltage of the motor are provided as separate members from the support member, and the structure becomes complicated and the motor becomes large. .

The present invention has been made to solve the problems of the vibration wave motor, and has a shape of a motor support member which is more effective in insulating vibration. By minimizing the external dimensions of the motor including the body and the electrical terminals as much as possible, it is suitable for installation in a limited space, and furthermore, the output efficiency is high and no audible sound is generated. An object is to provide a vibration wave motor having high stability.

[0010]

SUMMARY OF THE INVENTION A vibration wave motor according to the present invention includes a piezoelectric element for generating a longitudinal vibration or a sliding vibration when an AC voltage is applied thereto, and a terminal for applying the AC voltage to the piezoelectric element. A plate, the piezoelectric element and the terminal plate are pressure-fixed and fixed, and a vibrating body that converts longitudinal vibration of the piezoelectric element into a combined vibration of longitudinal vibration and lateral vibration at an end surface, and press-contacts the surface of the vibrating body And a moving member that is driven to rotate with respect to the vibrating body by the combined vibration, and extends from the vicinity of the installation portion of the piezoelectric element in parallel with the rotation axis of the moving member, and has a tip near the end of the vibrating body. is fixed to the mounting member Te, characterized by comprising a support member having the terminal board and the conductive formation <br/> are engaged, conductive at installation the vicinity of the piezoelectric element.

[0011]

The supporting member for supporting the vibrating body has a shape in which the supporting member is coupled to the terminal plate at a substantially node of vibration of the vibrating body.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1, 2, and 3 are a longitudinal sectional view of a vibration wave motor and a mounting portion, a plan view of a torsion connector, and a perspective view of a support showing a first embodiment of the present invention. The vibration wave motor according to the present invention is a longitudinal vibration type torsional coupler type vibration wave motor, and includes a vibrator 8 as a stator unit, a rotor 10 as a moving member, and a pressure contact mechanism 16.

The vibrator 8 has piezoelectric elements 1a, 1b whose polarization directions are opposed to each other in the direction shown by the arrow in FIG.
And ring-shaped terminal plates 2a, 2b and a support 3 arranged so as to sandwich the piezoelectric element in a sandwich state.
Terminal plate portion 3a which constitutes a part of
(a), the front vibrator (4) crimped to the piezoelectric element (1a), the rear vibrator (5) crimped to the piezoelectric element (1b) via the lower terminal plate portion (3a), and the torsion connector further crimped to the front vibrator (4) 6 and the front and rear vibrators 4 and 5 are connected to the terminal boards 2a and 2
In order to crimp the piezoelectric elements 1a, 1b via the terminal board 3a and the piezoelectric element 1a, 1b, the crimping body 7 is inserted from below through the piezoelectric elements 1a, 1b and screwed to the torsion connector 6.
And a ground-side lead wire 9a connected to the terminal plate 2a and the terminal plate portion 3a, a high-frequency voltage application-side lead wire 9b connected to the terminal plate 2b, and further connected to the terminal plate portion 3a. 3 having a motor supporting member 3b
It is composed of Note that the lead wires 9a and 9b are guided to the outside through the through holes of the rear vibrating body 5. Further, the piezoelectric elements 1a and 1b are arranged near nodes of vibration of the vibrator 8.

The lower surface of the rotor 10 is pressed against the beam 6c of the torsion connector 6 by a pressing mechanism. The pressing mechanism 16 transmits a pressing force to the rotor 10, a thrust ball bearing including a ball 11 and a ball presser 12, a disc spring 13 for applying the pressing force, a spacer 14 for adjusting the spring pressure, and a spacer. And a rotor shaft 15 which presses the disc spring 13 via the through hole, rotatably supports the thrust ball bearing and the rotor 10, and is screwed to the torsion connector 6. In addition, since the thrust ball bearing is pre-loaded by the disc spring 13, the centering action works. Therefore, even if the rotor 10 is not fitted to the rotor shaft 15 without any gap, the rotor 10 is automatically centered and driven on the rotor shaft 15.

The support 3 for mounting the motor has a shape as shown in FIG. That is, the support 3 is formed of a terminal plate portion 3a of a flat portion formed in a donut shape and a support member portion 3b described later. The support member portion 3b extends integrally from two symmetrical positions on the outer peripheral edge of the terminal plate portion 3a, and extends in the axial direction of the rotor 10 and along the outer peripheral surface of the rear vibrator 5. After being bent downward at a right angle, each lower end is further bent outward at a right angle. Therefore, the terminal plate portion 3a and the fixed portion 3c are of an integral structure,
It will be composed of a conductive member.

As shown in FIG. 1, an attaching member 1 is attached to the motor attaching portion formed by the lower bent portion.
8 is provided with a through hole 3c for screwing,
The motor is screwed to the mounting member 18 with screws 17 inserted into the through holes 3c.

Next, the operation of the present embodiment will be described. When a high-frequency voltage is applied to the piezoelectric elements 1a, 1b through the lead wires 9b, 9a, in the vicinity of the resonance of the front and rear vibrators 4, 5 constituting the vibrator 8. The longitudinal vibrations generated in the piezoelectric elements 1a and 1b become resonance longitudinal vibrations in the vibrator. Due to the generated resonance longitudinal vibration, the leg 6a of the torsion connector 6
Via (see FIG. 2), a bending vibration is excited in the disk portion 6b with the screw connection portion 6d with the crimping body 7 as a node and the belly near the leg portion 6a. Since the material and shape of the torsional coupler 6 are selected so that the bending vibration resonates with the resonance longitudinal vibration, a bending vibration having a large amplitude is excited in the disk portion 6b. As shown in FIG. 2, since the beam 6c is provided to be inclined with respect to the leg 6a, torsional vibration is generated in the beam 6c with the crimped joint as a node.

Since the torsional coupler 6 is made of a shape and material that resonates with this torsional vibration, a large amplitude torsional vibration is generated in the beam portion 6c, and the torsional coupler 6 and the rotor 10 are connected to each other. Elliptical vibration in which torsional vibration and longitudinal vibration are combined occurs at the contact interface. Due to this elliptical vibration, the rotor 10 pressed against the torsional coupler 6 is driven in the rotational direction of the elliptical vibration.

At this time, high-frequency vibration is generated in the vibrator 8, and if a portion corresponding to the antinode of the vibration is pressed or fixed, the vibration of the vibrator 8 is obstructed, and the output of the motor decreases. In some cases, it stops. Therefore, when supporting the vibrator 8, it is desirable to fix the vicinity of the nodes of the vibration of the front and rear vibrators 4 and 5. Therefore, in the present embodiment, the terminal plate portion 3
a, and the supporting member 3b of the supporting body 3 shown in FIG.
Not to interfere with the vibration. Further, the support member 3b constituting the support 3 extending in the axial direction has a shape suitable for damping the vibration generated in the vibrator 8, so that the loss of the vibration is minimized.

Further, as described above, since the support 3 is only bent in the axial direction at the outer peripheral portion of the motor, it is not necessary to provide a large space for supporting the outer peripheral portion of the motor. The motor can be arranged in the lower part opposite to the output side of the motor, and the motor can be stored in a smaller space. Further, since the terminal plate portion 3a of the support 3 also serves as the ground terminal, there is no need to newly provide a ground terminal or the like, and the component configuration is simplified.

In this embodiment, the grounding lead wire 9a is connected to the terminal plate portion 3a. As a modified example, the grounding lead wire is connected to the end of the support member 3b on the mounting portion side. You may make it. Further, in this embodiment, the ground terminal portion is configured to be also used as the terminal plate portion 3a of the support 3, but the terminal plate portion may be provided separately from the support 3. Further, the portion where the motor is mounted is formed by bending the support member 3b outward at a predetermined position, but conversely bending the support member 3b in the motor axial direction.
If the mounting portion b is formed, or if the bending is not performed, and the mounting is performed at a portion extending in the motor axial direction, a further space-saving motor can be realized.

In this embodiment, the case where the number of the support members 3b is two has been described. However, if it is necessary to further stabilize the holding of the motor, a large number of the above-mentioned fixing portions may be provided. Instead of the support member 3b formed to extend in the motor axial direction, a cylindrical fixing portion surrounding the outer periphery of the motor may be used. In this case as well, it is necessary to consider the damping of the vibration, and the second moment of area in the section perpendicular to the axis of the outer periphery of the motor corresponding to the support member 3b of the support 3 is set to a predetermined value in consideration of the resonance frequency. Must be determined.

Further, in this embodiment, the motor is fixed by the post-oscillation body 5.
However, if necessary for installation of the motor, the support member 3b of the support 3 may be connected to the torsion connector 6
, And can be fixed on the torsion connector 6 side.

Next, a description will be given of a vibration wave motor according to a second embodiment of the present invention. 4 and 5 are a longitudinal sectional view of a vibrator and a mounting portion of the vibration wave motor of the present embodiment, and a perspective view of a support of the motor. The vibration wave motor of the present embodiment is
Although it is a torsional coupler type vibration wave motor like the first embodiment, only the structure of the support is different from that of the first embodiment, and only the support will be described.

That is, the support 2 of the vibration wave motor of this embodiment
Numeral 6 is composed of a terminal plate 21 and a support member 22, but the two members are not integrally molded products, and as shown in FIG. 5, the support member 22 is a conductive member formed of a shaft member. Then, it is connected to the donut-shaped terminal plate 21 by means such as caulking, screwing, welding, and outsert molding.

The support member 22 is provided with a rear vibrating body 23.
Notches 23a provided axially at symmetrical portions of the outer peripheral surface of
And a screw hole for fixing is provided on the mounting surface side of the motor mounting portion 24 under the motor mounting portion 24. In addition, the notch groove 23a is formed to have a size that does not interfere with the fixing portion 22 in terms of vibration proofing, and furthermore, a vibration proofing agent or the like may be applied to the gap to obtain a vibration proofing effect. The ground side lead wire 9a is connected to the terminal plate 21 of the support 26.

As shown in the vertical sectional view of FIG. 4, the support 26 is composed of the piezoelectric elements 1a and 1b and the front and rear vibrators 4 and 23 with the terminal plate 21 pressed against the piezoelectric element 1b. At the node of vibration of the vibrator 20 to be performed.
Then, the screw 25 is screwed into the screw hole of the support member 22 to be fixed to the mounting member 24. Therefore,
The support member 22 of the support 26 is coupled to the terminal plate 21 on the vibration node of the vibrator 20.

The vibration wave motor of the present embodiment having the above-described structure has the same vibration damping function as that of the motor of the first embodiment, and the parts for supporting and fixing the motor have the outer diameter of the motor. Therefore, a vibration-wave motor which is more space-saving than that of the first embodiment can be obtained.

In this embodiment, the rear vibrating body 23 is provided with the cutout groove 23a for inserting the support member 22, but it may be a through hole. In this case, the lead wire 9 shown in FIG.
The holes 23b for inserting the holes a and 9b can be used also as the through holes. That is, the support member 22 is formed of a pipe, which is fixed to the terminal plate 21, and the lead wires 9a and 9b may be passed through the pipe, and the rear vibrator 23 is added to the notch groove 23a as described above. Hole 23 for REET wire
There is no need to provide b. Further, if the support member 22 is used as a current supply path to the terminal plate 21, the lead wire 9a can be omitted.

Although the number of the support members 22 is two in this embodiment, it is also possible to use a large number of two or more.
Further, various fastening positions of the support member 22 with respect to the mounting member 24 can be considered in the same manner as described in the first embodiment. Further, in the present embodiment, the support 26 is
It is premised that the member is formed by fastening the support member 22 and the support member 22. However, as in the first embodiment, a member having the same effect as that of the present embodiment can be realized even with an integral structure. It is possible.

The support member 22 of this embodiment must also have a vibration wave damping effect as in the case of the first embodiment. However, since the support member 22 is not integrated with the support member 21, the support member 22 is A plastic material having an excellent damping effect, a composite plastic material with an inorganic material, or the like can be used. In this modification, the vibrator can be supported in a stable state having a more vibration-proof effect than the thin plate-like support member used in the first embodiment.

Next, a description will be given of a vibration wave motor according to a third embodiment of the present invention. 6 and 7 are a longitudinal sectional view of a vibrator and a mounting portion of the vibration wave motor of the third embodiment, and an exploded perspective view of the vibrator of the vibration wave motor. The motor of this embodiment is also a torsional coupler type vibration wave motor, but differs from the first embodiment in the motor support means and the power supply means.

First, in the first embodiment, a single terminal plate portion and two extended support members constituting a support are used as a single unit. In this embodiment, the support is used. It is separated into two parts. That is, the supports 32 and 33
Are used. The support 32 is a support 3
The support 33 is composed of a support member 33a and a terminal plate 33b, each of which is integrally formed. As shown in FIG. 7, unlike the case of the first embodiment, the terminal plate portions 32a and 33a are provided on the outer peripheral portion of the motor at the support member portions 32b and 33b, respectively.
Are respectively formed by bending in the direction of the torsional connector 6 along the axial direction of the rotor as the moving member. Further, the tip portion is bent outward at a right angle as a motor mounting portion.

The motor mounting portion is provided with through holes 32c and 33c for mounting the motor and terminal portions for lead wires. The support 3
3, the terminal plate 33a is interposed between the piezoelectric elements 1a and 1b and is also used as an electrode for applying a high-frequency voltage. Insulated. Further, the supports 32, 33
Support members 32b, 33b and the vibrator 4 of the vibrator 30
Vibration absorbing members 34a and 34b are interposed in the gaps formed between them to improve the vibration isolation effect.

In this embodiment, as shown in FIG. 6, a mounting member 35 is provided on the torsion connector 6 side.
The through holes 32c, 33c of the support members 32b, 33b
This motor is attached to the mounting member 3 by the screw 36 inserted through
Fix to 5. As for the wiring of the lead wire, the terminal portion provided near the through holes 32c and 33c, the grounding lead wire 37 toward the support body 32 on the ground side, and the support body on the high frequency voltage application side. 33 is connected to a high-frequency voltage lead wire 39, respectively. Since the terminal plate 2 and the terminal plate portion 32a are both ground-side electrodes, they are short-circuited by the lead wires 38.

In the present example configured as described above,
The support portion of the motor can be disposed above the output side of the motor, and there is no need to draw out the power supply lead wire from the inside of the vibrating body, and the lead wire can be processed externally. Therefore, safe and reliable power supply can be performed, and the lead wire does not need to be routed in the vicinity of the vibrating body, so that the lead wire does not contact the vibrating body and generate unpleasant audible sound. .

Further, the vibration of the vibrator 30 is not impaired by the action of the vibration absorbing members 34a and 34b, and the generation of audible sound due to unnecessary vibration is suppressed. Further, the deformation of the support members 32, 33 due to the external force is also prevented by the absorbing members 34a, 34b.
, The motor position can be stabilized. The vibration absorbers 34a and 34b are made of a vibration-proof material such as felt, cork, rubber, and plastic. If an electrically insulating material is used, it is also effective for insulating the support 33 on the high frequency voltage side from the vibrator 30. In this embodiment, the vibration absorbing members 34a and 34b are fixed to the supports 32 and 33 as shown in FIG. 7, but the vibration absorbing members 34a and 34b may be fixed to the front vibrator 4 side of the vibrator 30. An equivalent effect can be obtained.

As in this embodiment, the support is divided into two parts.
The configuration in which the electrodes are different from each other can also be applied to the case where the support member is disposed on the rear vibrator 5 side as in the first embodiment. In the first to third embodiments, the case where the present invention is applied to a torsional coupler type vibration wave motor is shown.
Ultrasonic torsional vibrator type motor using a combination of a torsional vibrating piezoelectric element and a thickness vibrating piezoelectric element as disclosed in JP-A-121777, or Japanese Patent Application Laid-Open No. 62-12687.
The present invention can also be applied to an ultrasonic motor using a piezoelectric element having electrodes that are polarized in the thickness direction and divided in the circumferential direction, as disclosed in Japanese Patent No. it can.

Next, an application example of the vibration wave motor of the present invention will be described. Conventionally, an electromagnetic motor is provided in a spool chamber or a film storage chamber for winding and rewinding a film of a camera. Then, in the conventional motor, the support portion is located near the central portion of the motor, and the terminal portion for applying the driving voltage is provided as a separate member from the support portion, so that there is a problem in the storage space of the spool chamber. . In addition, the above-mentioned support member portion has a conventional configuration,
Even if the motor is moved to the lower or upper part of the motor, the vibration of the vibrating body is hindered, and the efficiency of the motor is reduced, and in some cases, the motor cannot rotate.

Therefore, the mounting portion can be moved to the lower or upper portion of the motor without disturbing the vibration as in the present invention, and the terminal occupying space can be reduced by integrating the terminal portion with the supporting portion. This vibration wave motor can be arranged in a spool room or a film storage room having the same space as a conventional electromagnetic motor.

[0041]

As described above, in the vibration wave motor according to the present invention, the support member is connected to the terminal plate near the node of the vibration so as not to hinder the vibration of the vibrating body. The mounting portion for the support member is provided at a position separated from the moving member along the direction of the rotation axis, and the support member and the terminal plate are integrally formed. Therefore, a vibration wave motor that is highly efficient without being hindered by the support member, can be supported at a position suitable for the motor arrangement, and does not need to be provided with a separate terminal plate is realized. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a torsional coupler type vibration wave motor and a mounting portion thereof according to a first embodiment of the present invention.

FIG. 2 is a plan view of a torsional coupler of the torsional coupler type vibration wave motor of the first embodiment.

FIG. 3 is a perspective view of a support of the torsional coupler type vibration wave motor of the first embodiment.

FIG. 4 is a longitudinal sectional view of a vibrator of a torsional coupler type vibration wave motor and a mounting portion thereof according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of a support and a rear vibrator of the torsional coupler type vibration wave motor of the second embodiment.

FIG. 6 is a longitudinal sectional view of a vibrator of a torsional coupler type vibration wave motor and a mounting portion thereof according to a third embodiment of the present invention.

FIG. 7 is an exploded perspective view of a support, a front vibrator and a piezoelectric element of the torsional coupler type vibration wave motor of the third embodiment.

[Explanation of symbols]

1a, 1b Piezoelectric element 3a, 32a, 33a Terminal plate part (terminal plate) 3b, 32b, 33b Support member part (support member) 4 Previbrator (Vibration body) 5, 23 ... Post-vibration body (vibration body) 8, 20, 30 ... Vibrator (vibration body) 10 ... Rotor (moving member) 21 ... Terminal plate 22 Support member

Claims (1)

(57) [Scope of request for utility model registration] A piezoelectric element for generating a longitudinal vibration or a sliding vibration by applying an AC voltage, a terminal plate for applying an AC voltage to the piezoelectric element, and crimping the piezoelectric element and the terminal plate. Fix the above piezoelectric element
A vibrating body that converts the longitudinal vibration into a combined vibration of the longitudinal vibration and the transverse vibration at the end surface; and a moving member that is pressed against the surface of the vibrating body and is rotationally driven with respect to the vibrating body by the combined vibration. The installation part of the piezoelectric element in parallel with the rotation axis of the moving member
A support member extending from the vicinity and having the tip fixed to the mounting member near the end of the vibrating body and conductively coupled to the terminal plate near the installation portion of the piezoelectric element , A vibration wave motor comprising: "