JP3244961B2 - Ultrasonic motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of an ultrasonic motor,
In particular, the present invention relates to a conduction structure of an ultrasonic motor and an electronic device with an ultrasonic motor.

[0002]

2. Description of the Related Art A conventional ultrasonic motor has a conductive structure to a piezoelectric element, as shown in a sectional view of FIG. 3 and a plan view of a piezoelectric element of FIG.
The lead wire 260 was fixed to the pattern A205A and the pattern B205B of No. 05 by soldering 231 or the like. For example, JP-A-3-198673, JP-A-Hei-4
A structure of a conventional ultrasonic motor is disclosed in JP-A-125084 and the like.

[0003]

In the structure of the conventional ultrasonic motor as described above, since the lead wires are fixed to the piezoelectric element by soldering, the assembling work is complicated. In addition, since the lead wire is thin, there is anxiety such as disconnection in handling, and it is necessary to protect the terminal of the lead wire. Therefore, an object of the present invention is to provide an ultrasonic motor that is easy to assemble and safe in handling.

[0004]

In order to solve the above-mentioned problems, the present invention provides a lead board for transmitting an electric signal to a piezoelectric element of an ultrasonic motor, provided on the center axis of the support plate by using the center axis as a guide. The structure is such that it is supported by a step portion and a vibrating body or a piezoelectric element fixed to the vibrating body.

[0005]

The lead board for inputting electric signals to the piezoelectric element of the ultrasonic motor is guided by the center axis of the support plate, and is supported by a step provided on the center axis and the piezoelectric element fixed to the vibrator. The lead substrate is firmly fixed. In addition, since the lead pattern is wired on the lead substrate, the conductive structure can be wider than the lead wire, and the strength increases. When an electric signal is transmitted to the piezoelectric element via the lead wire, the piezoelectric element expands and contracts, and drives the moving body by a vibration wave generated in the vibrating body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. The center shaft 121 is fixed to the support plate 120.
The piezoelectric element 105 is fixed to the surface of the vibrating body 101 where the displacement enlarging portion 102 is not provided by bonding or the like. A part of the vibrating body 101 is provided with a comb-shaped displacement enlarging portion 102 in an annular shape.

[0007] The lead substrate 130 is guided by the central axis 121. The lead substrate 130 includes a step portion 126 provided on the center axis 121 and the piezoelectric element 1 fixed to the vibrating body 101.
05 supported. A sliding plate 111 is fixed to a contact portion between the moving body 110 and the displacement expanding section 102 of the vibrating body 101 by adhesion in order to adjust frictional resistance and prevent scraping. The moving body 110 is provided with a bearing 112 at the center,
One is set.

The spring 123 includes a spring retainer 124 and a spring holder 1.
22. The spring retainer 124 is fixed to the center shaft 121 by a screw 125. The spring pressure of the spring 123 constituting the pressurizing means is transmitted via the spring receiver 122 to the movable body 110.
To a bearing 122 provided at the center of the bearing. Spring 123
Presses the moving body 110 against the vibrating body 101 with a predetermined pressure.

The piezoelectric element 105 is provided with a pattern (A) 105A and a pattern (B) 105B in which every twelve equally divided shapes are connected. The lead substrate 130 is preferably made of a flexible material such as polyimide. The lead board 130 is provided with a lead pattern (A) 130A and a lead pattern (B) 130B. Lead substrate 13
0A lead pattern (A) 130A and lead pattern (B) 130B correspond to the pattern (A) 10 of the piezoelectric element 105.
5A and the pattern (B) 105B.

[0010] Lead pattern (A) of lead substrate 130
130A is a pattern (A) 105A of the piezoelectric element 105.
Connect with The lead pattern (B) 130B of the lead substrate 130 is the pattern (B) 1 of the piezoelectric element 105.
05B. The lead pattern (A) 130A and the lead pattern (B) 130B of the lead substrate 130 and the pattern (A) 105A and the pattern (B) of the piezoelectric element 105.
105B are configured such that they do not contact each other. The lead substrate 130 contacts only at the center of the piezoelectric element 105 and does not contact at the periphery of the piezoelectric element 105.
Preferably, if an insulating member is applied to the periphery of the lead substrate 130, the insulating property is further improved.

(2) Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. The piezoelectric element 205 has a pattern (A) 205A and a pattern (B) in which every twelve equally divided shapes are connected.
205B is provided. The lead substrate 730 is preferably made of a flexible material such as polyimide. The lead substrate 730 is provided with a lead pattern (A) 730A and a lead pattern (B) 730B. Lead pattern (A) 7
30A and the lead pattern (B) 730B are formed from the windows 731 provided on the lead substrate 730 so that one end thereof is overhanged.

The lead pattern (A) 730A and the lead pattern (B) 730B overhanging from the window 731 of the lead substrate 730 are the pattern (A) 205A and the pattern (B) 20 provided on the piezoelectric element 205, respectively.
Conduction is achieved by pressure bonding to 5B. Lead pattern (A) 73
0A and lead pattern (B) 730B and piezoelectric element 20
Conduction with 5 is preferably by welding, soldering, conductive adhesive or the like. The lead substrate 730 is supported by the vibrating body 101 to which the step portion 126 provided on the central axis 121 and the piezoelectric element 205 are fixed.

(3) Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG.
The difference from the first embodiment is that the center shaft 221 is a screw pin,
It is to fix to the support plate 220. Lead board 130
Is guided by the projection step 251 of the support plate 220, and is supported by the projection 250 and the piezoelectric element 105. This makes it possible to support the lead substrate 130 with an appropriate strength, thereby improving the assemblability and effective in after-sales service.

(4) Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIGS. The piezoelectric element 505 is patterned into a shape equally divided into twelve. The lead board 530 is a double-sided board having a pattern formed on both sides. The lead substrate 530 forms 12 through holes at equal intervals around the hole through which the central axis 121 passes, and each of the through hole patterns comes into contact with the corresponding pattern of the piezoelectric element 505 divided into 12 equal parts.

The through holes formed in the lead substrate 530 are connected to every other pattern on the side not in contact with the piezoelectric element 505, and the lead pattern (A) 53 is formed.
0A and a lead pattern (B) 530B. An insulating plate 540 is interposed between the lead board 530 and the stepped portion 126 provided on the center axis 121, and the lead pattern (A) 530A and the lead pattern (B) 530B provided on the lead board 530 are connected to the center axis 121. To prevent conduction. The lead substrate 530 is provided with a notch 531 so as to be in contact only at the center of the piezoelectric element 505 and not at the periphery of the piezoelectric element 505.
In the structure of the fourth embodiment of the present invention, the pattern of the piezoelectric element has a very simple shape.

(5) Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIGS. The piezoelectric element 505 is patterned into 12 equally divided shapes. The lead substrate 630 is preferably made of a flexible material such as polyimide. The lead substrate 630 is provided with a lead pattern (A) 630A and a lead pattern (B) 630B.

The lead pattern (A) 630A is formed by forming a pattern near one round on the inner side, and protruding outward at six locations every 60 degrees. The lead pattern (B) 630B is the lead pattern (A) 6
A pattern of approximately one round is formed on the outer side of 30A, and further, the pattern is formed to protrude inward at six places every 60 degrees from a position shifted by 30 degrees from the protrusion of the lead pattern (A) 630A. .

A silver paste 550 is fixed to the leading end of the lead pattern (A) 630A and the lead pattern (B) 630B at twelve points to form protrusions, and an insulating layer 551 is applied on the lead patterns other than the protrusions. . Lead board 63
Numeral 0 is guided by the protrusion 250 of the support plate 220, supported by the protrusion step 251 and the piezoelectric element 505, and the lead pattern and the piezoelectric element 505 conduct.

(6) Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIGS. The piezoelectric element 505 is patterned into 12 equally divided shapes. The lead substrate 830 is preferably made of a flexible material such as polyimide. The lead substrate 830 is provided with a lead pattern (A) 830A and a lead pattern (B) 830B.

The lead pattern (A) 830A is formed by forming a pattern that is almost one round on the inside, and further protruding the pattern outward every 60 degrees. The lead pattern (B) 830B forms a pattern almost one round outside the lead pattern (A) 830A, and is further shifted every 60 degrees from a position shifted by 30 degrees from the protrusion of the lead pattern (A) 830A. The pattern is formed to protrude inward. The lead pattern (A) 830A and the lead pattern (B) 830B are formed from windows 831 provided in the lead substrate 830, with their tips overhanging.

The lead pattern (A) 830A and the lead pattern (B) 830B overhanging from the window portion 831 of the lead substrate 830 are the pattern (A) 505A and the pattern (B) 50 provided on the piezoelectric element 505, respectively.
Conduction is achieved by pressure bonding to 5B. Lead pattern (A) 83
0A, lead pattern (B) 830B and piezoelectric element 50
Conduction with 5 is preferably by welding, soldering, conductive adhesive or the like. The lead substrate 830 is supported by the vibrating body 101 to which the step portion 126 provided on the central axis 121 and the piezoelectric element 505 are fixed.

(7) Seventh Embodiment Next, a seventh embodiment of the present invention will be described with reference to FIG. The difference from the first embodiment is that the lead substrate 330 is a double-sided substrate having a pattern formed on both sides. Piezoelectric element 105
Lead pattern (C) 330C
Is formed, conduction with the central shaft 121 is obtained.
The ultrasonic motor can be driven even when the support plate 120 is used as an insulating member.

(8) Eighth Embodiment Further, using the ultrasonic motor of the present invention, a power transmitting means operating integrally with the moving body 110 of the ultrasonic motor, and an output operating based on the operation of the power transmitting means. The electronic device with the ultrasonic motor can be realized by the configuration including the means.

As the power transmission means, a transmission wheel such as a gear or a friction wheel is preferably used. As output means,
Preferably, hands are used in an electronic timepiece, a film feeder or a lens drive is used in a camera, a blade feeder or a workpiece feeder is used in a machine tool, and an arm is used in a robot. As the electronic device with an ultrasonic motor of the present invention, preferably, an electronic watch, a camera, a printer, a printing machine, a machine tool, a robot,
A mobile device can be realized.

(9) Ninth Embodiment Next, a ninth embodiment of the present invention will be described with reference to a longitudinal sectional view of an analog electronic timepiece using an ultrasonic motor shown in FIG. A vibrating body 201 having a piezoelectric element 305 adhered to the back surface is fixed to a guide pin 290, and this guide pin 290 is
1 is fixed with a set screw 292. A plurality of projections 293 are provided on the upper surface of the vibrating body 201, and the projections 293
While the moving body 210 receives the pressure of the pressure spring 294,
The guide pin 290 is rotatably incorporated by being guided by a tip portion 290a of the guide pin 290.

Through the first connection means 295a or the second connection means 295b joined to the piezoelectric element 305,
A constant frequency voltage is applied from a driving circuit (not shown) to the piezoelectric element 30.
5, the vibrating body 201 is deformed and the projection 2
Due to the deformation of 93, the moving body 210 is rotated at a constant speed. The moving body gear 210a on the outer periphery of the moving body 210 rotates the fourth wheel & pinion 296, and further, the third wheel & pinion 297 and the minute wheel 29.
8. The minute wheel (not shown) and the hour wheel 299 are rotated at a constant speed.

If the period of the frequency voltage applied to the piezoelectric element 305 and the number of teeth of each gear are set to predetermined values, the hour is set by the hour hand attached to the hour wheel, and the minute is set by the minute hand attached to the minute wheel. The second can be displayed by the second hand attached to the guard wheel. In addition to displaying the time information by using a plurality of wheel trains and hands as described above, the time information can be displayed by directly attaching hands or indicators to the moving body 210, which can be displayed from the side of the dial 289 in FIG. The pressure spring 29
4 can also be seen from the side.

Further, by adjusting the drive signal output from the transmission drive circuit to the piezoelectric element 305 by the motor control circuit, the second hand can be moved stepwise every second or continuously. In addition to the display of the time information, it is also possible to display a calendar such as year, month, day, etc., a remaining battery level, environmental information, and a mechanism.

[0029]

The present invention according to the present invention, as described above, guides the lead substrate with the central axis, supported by a vibrating body or a piezoelectric element and a step portion provided in the center axis, leads to the pattern of the piezoelectric element substrate Due to the structure that conducts by directly contacting the above pattern, the following effects are obtained. (1) The assembly work of the ultrasonic motor is facilitated. (2) The handling strength of the lead of the ultrasonic motor is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of an ultrasonic motor according to the present invention.

FIG. 2 is a plan view of a first embodiment of a piezoelectric element and a lead board of the ultrasonic motor according to the present invention.

FIG. 3 is a sectional view of a conventional ultrasonic motor.

FIG. 4 is a plan view showing how a piezoelectric element and a lead wire of a conventional ultrasonic motor are mounted.

FIG. 5 is a partial sectional view of a second embodiment of the ultrasonic motor according to the present invention.

FIG. 6 is a plan view of a second embodiment of the piezoelectric element and the lead board of the ultrasonic motor according to the present invention.

FIG. 7 is a sectional view of a third embodiment of the ultrasonic motor according to the present invention.

FIG. 8 is a partial sectional view of a fourth embodiment of the ultrasonic motor according to the present invention.

FIG. 9 is a plan view of a piezoelectric element and a lead board of an ultrasonic motor according to a fourth embodiment of the present invention.

FIG. 10 is a partial sectional view of a fifth embodiment of the ultrasonic motor according to the present invention.

FIG. 11 is a plan view of a fifth embodiment of the lead board of the ultrasonic motor according to the present invention.

FIG. 12 is a partial sectional view of a sixth embodiment of the ultrasonic motor according to the present invention.

FIG. 13 is a plan view of a piezoelectric element and a lead board of an ultrasonic motor according to a sixth embodiment of the present invention.

FIG. 14 is a plan view of a lead board according to a seventh embodiment of the present invention.

FIG. 15 is a longitudinal sectional view of a ninth embodiment of an analog electronic timepiece using the ultrasonic motor of the present invention.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Watanabe 6-31-1, Kameido, Koto-ku, Tokyo Inside Seiko Electronic Industries Co., Ltd. (72) Takashi Sato 6-31-1, Kameido, Koto-ku, Tokyo Seiko Electronics Co., Ltd. (72) Inventor Kunihiko Honda 6-31-1, Kameido, Koto-ku, Tokyo Seiko Electronics Co., Ltd. (56) References JP-A-63-305774 (JP, A) JP-A-60-200779 (JP, A) JP-A-2-287281 (JP, A) JP-A-8-140371 (JP, A) JP-A-60-30690 (JP, U) (58) Int.Cl. ⁷ , DB name) H02N 2/00

Claims (14)

(57) [Claims] And 1. A central axis, fixed to the central shaft, a vibrator fixing the piezoelectric elements, in contact with a predetermined pressure to the vibrating body, the moving body frictionally driven by vibrating waves generated by the expansion and contraction movement of the piezoelectric element And a lead board that transmits a predetermined electric signal to the piezoelectric element , wherein the lead board passes a hole provided at the center through a central axis.
Step and a piezoelectric element provided on the central axis
An ultrasonic motor characterized by being supported by being sandwiched therebetween . 2. A central axis, fixed to the central shaft, a vibrator fixing the piezoelectric element, an ultrasonic motor and a lead substrate convey a predetermined electric signal to the piezoelectric element, the lead substrate, Pass the center hole through the center axis
Between the vibrating body and the step provided on the center axis.
An ultrasonic motor characterized by being supported by being sandwiched between . 3. A center axis fixed to a support plate, a vibrating body fixed to the center axis and fixing a piezoelectric element, and a vibrating wave generated by expansion and contraction of the piezoelectric element by contacting the vibrating body with a predetermined pressure. An ultrasonic motor having a moving body that is driven by friction and a lead substrate that transmits a predetermined electric signal to a piezoelectric element , wherein the lead substrate has a hole provided at the center thereof formed by a projection of a support plate.
Guided by passing through the part, the projection step provided on the support plate
An ultrasonic motor supported by being sandwiched between a portion and a piezoelectric element . 4. A central shaft, which is fixed to the central shaft, a vibrator fixing the piezoelectric element, an ultrasonic motor and a lead substrate convey a predetermined electric signal to the piezoelectric element, the lead substrate , Pass the center hole through the center axis
Guided by the
Supported by being sandwiched between an insulating plate and a piezoelectric element
Ultrasonic motor, characterized in that that. 5. A central axis, fixed to the central shaft, a vibrator fixing the piezoelectric element, an ultrasonic motor and a lead substrate convey a predetermined electric signal to the piezoelectric element, provided on the lead board Of the piezoelectric element
An ultrasonic motor, wherein a silver paste is fixed to a portion to be electrically connected to a turn to form a projection, and an insulating layer is applied on a lead pattern other than the projection. 6. A central axis, fixed to the central shaft, a vibrator fixing the piezoelectric element, an ultrasonic motor and a lead substrate convey a predetermined electric signal to the piezoelectric element, the lead board lead pattern Is the window provided on the lead board
Overhanging by the same number as the number of pattern divisions of the piezoelectric element from the portion , and formed so that adjacent leads have different lead patterns, and made the pattern of the piezoelectric element conductive. Ultrasonic motor. 7. A lead pattern provided on a lead substrate.
The ultrasonic motor according to any one of claims 1 to 3, wherein the second member is directly connected to a piezoelectric element or a pattern provided on the piezoelectric element . 8. The lead pattern of a lead substrate is a lead pattern.
It overhangs from the window provided on the board, and one end is pressed.
3. The ultrasonic motor according to claim 2, wherein the ultrasonic motor is electrically connected to an electric element or a pattern of a piezoelectric element . 9. The lead pattern of a lead substrate is a lead pattern.
Formed on both sides of the substrate, using a through hole from the outside of the outer periphery of the vibrator , arranging a lead pattern on the support plate side,
The lead pattern of the lead board is formed on the piezoelectric element side again by through holes in the inner peripheral part of the piezoelectric element.
It is characterized by being formed and conducting with the pattern of the piezoelectric element
Any one of claim 1 or claim 3 or claim 4
An ultrasonic motor according to the item . 10. A lead putter provided on a lead substrate.
The piezoelectric element or the pattern provided on the piezoelectric element
When directly conducts and re provided on the other surface of the lead substrate
Dopatan, by conduction directly with the central axis, the support plate
2. The ultrasonic motor according to claim 1, wherein an electric signal can be transmitted even when the member is an insulating member. 11. A method in which two alternately and evenly arranged packets are provided.
Turns are turned on by the short circuit pattern
The ultrasonic motor according to claim 1, wherein the ultrasonic motor is configured using a piezoelectric element . 12. The method according to claim 1, wherein the piezoelectric element is formed by using piezoelectric elements in which the patterns are arranged alternately and evenly, and each is formed independently. Ultrasonic motor. 13. The power transmission device according to claim 1, further comprising: a power transmission unit that operates integrally with the moving body; and an output unit that operates based on the operation of the power transmission unit. An electronic device with an ultrasonic motor as described in the above. 14. A power supply, a source oscillation for outputting a reference signal, a clock control circuit for outputting a predetermined time signal, and a drive for operating an ultrasonic motor by inputting an output signal output from the clock control circuit. A motor drive circuit for outputting a signal, an ultrasonic motor according to any one of claims 1 to 10, which operates by inputting a drive signal output from the motor drive circuit, and a predetermined operation performed by the operation of the ultrasonic motor. And a display means for displaying the above information. An analog electronic timepiece using an ultrasonic motor.