JPH05244785A - Ultrasonic motor - Google Patents

Abstract

PURPOSE:To output power from a rotary member by bringing a sliding member of a rotor into pressure contact with an end face of a ringlike or disclike piezoelectric vibrators by a spring. CONSTITUTION:Many sliding members 4 are provided inside a ringlike frame 2 through a spring member 3 to constitute a rotor 5, and the members 4 of the rotor 5 are brought into contact with a ringlike or disclike piezoelectric vibrator 1. A member 6 having a high frictional coefficient is adhered to or integrated with the outer periphery of the frame 2 of the rotor 5. In an ultrasonic motor constructed in this manner, an AC voltage is applied to the electrodes of the vibrator 1 to generate a traveling wave at the end face of the vibrator 1, thereby rotating the rotor 5 by the wave, and hence the part of the member 6 provided on the outer periphery of the frame 2 of the rotor 5 is allowed to protrude from a hole 7c of a case 7 to be brought into contact with a rotary member 8, thereby outputting power by the member 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a super-rotor for rotating a rotor by bringing a sliding member mounted through a spring member provided inside the rotor into contact with an end face of a thin ring-shaped or disc-shaped piezoelectric vibrator. The present invention relates to a sound wave motor.

[0002]

2. Description of the Related Art The applicant of the present invention forms electrodes on both sides of a ring-shaped vibrator or a disk-shaped vibrator, forms a groove in the center of these electrodes to divide each electrode into two, and determines the angle of the groove. We propose an ultrasonic motor that generates traveling waves on the side and both sides of a ring-shaped oscillator or disc-shaped oscillator by applying alternating voltage to one electrode of each of the two divided electrodes (See JP-A-64-30477).

[0003]

By the way, in this ultrasonic motor, since the driving body is brought into contact with one surface of the ring-shaped vibrator or the disk-shaped piezoelectric vibrator to drive the electrode, the electrodes are driven by the driving body. However, there was a problem that the electrode was worn out immediately after being contacted with.

[0004]

SUMMARY OF THE INVENTION According to the present invention, one end of a plurality of spring members is integrally formed or bonded or fixed to the inside of a ring-shaped frame, and a sliding member is integrated with the other end of the spring members. Is formed or adhered to form a rotor, and the sliding member of the rotor is pressed against the end face of the thin ring-shaped or disc-shaped piezoelectric vibrator.

[0005]

According to the present invention, the sliding member mounted on the frame of the rotor via the spring member is pressed against the end face of the ring-shaped or disc-shaped piezoelectric vibrator.

When alternating current power is supplied to the ring-shaped or disk-shaped piezoelectric vibrator, a traveling wave is generated at the end face of the ring-shaped or disk-shaped piezoelectric resonator, and the sliding member is moved by this traveling wave to move the rotor. To rotate.

If a rotary shaft is attached to this rotor, power can be taken out from the rotary shaft, and a part of a member having a high friction coefficient attached to the outer periphery of the rotor is made to project from the case, and this projecting When the rotating body or the linear moving body is brought into contact with the member, power can be taken out by the rotating body and the linear moving body.

Further, by mounting a gear on the outer circumference of the rotor,
By engaging with another gear, power can be taken out by the gear.

FIG. 1 is a plan view of an ultrasonic motor according to an embodiment of the present invention. One end of a plurality of spring members 3 is formed inside the ring-shaped frame 2 integrally with the frame 2. Alternatively, the rotor 5 is constituted by adhering or adhering with a screw or the like, and further adhering or adhering the sliding member 4 to the other end of the spring member 3, respectively. It is in contact with the end surface of the child 1.

As shown in FIG. 2, a guide 4a is formed on the sliding member 4 of the rotor 5, the guide 4a is configured to sandwich the ring-shaped piezoelectric vibrator 1, and the rotor 5 is a ring. The piezoelectric vibrator 1 is prevented from coming off.

The rotor 5 is made of synthetic resin or metal. If the surface of the rotor 5 has a sufficiently high coefficient of friction, the rotor 5 is used as it is, but the surface of the rotor 5 has a coefficient of friction. If is low, the member 6 having a high friction coefficient such as rubber or other synthetic resin is bonded to the outer periphery of the rotor 5.

Further, the case 7 and the projecting portion 7a are inserted and fixed in the hole 1a of the ring-shaped piezoelectric vibrator 1, and the case cover 7b is covered.

Further, a hole 7c is formed in the case 7, a part of the rotor 5 projects from the hole 7c of the case 7, and the member 6 of the rotor 5 is rotatably supported by the rotary shaft 8a. It is in contact with the body 8.

In the ultrasonic motor of this embodiment having the above-described structure, when AC power is supplied to the electrodes (not shown) of the ring-shaped piezoelectric vibrator 1, the rotor 5 is moved by moving the sliding member 2. The rotary body 8 rotates by this rotation, and power can be taken out from the rotary shaft 8a.

The ultrasonic motor according to the present embodiment can be made extremely small because the ring-shaped piezoelectric vibrator 1 can be configured to have a thickness of 1 mm to 1.5 mm. Since it shuts off as soon as the power supply is cut off, it does not require braking means like a normal electric motor and can be used to rotate the volume of audio equipment or be used for other control equipment. ..

FIG. 3 is a plan view of an ultrasonic motor according to still another embodiment of the present invention, and FIG. 4 is a side sectional view of the ultrasonic motor of FIG. The frame member 3 is a spring member, 4 is a sliding member, 5 is a rotor, 6 is a member having a high friction coefficient, and 7 is a case. Since these structures are the same as those in the above-described embodiment, the description thereof is omitted. However, in this embodiment, a part of the member 6 is projected from the hole 7c of the case 7,
The moving body 11 supported by the supporting rollers 9 and 10 facing the member 6 is in contact therewith.

In the ultrasonic motor of this embodiment having the above-described structure, when the member 6 is rotated by the rotation of the rotor 5, the moving body 11 in contact with the member 6 moves linearly. Etc. can be controlled.

FIG. 5 is a plan view of an ultrasonic motor according to another embodiment of the present invention, and FIG. 6 is a side sectional view of the ultrasonic motor of FIG. 5, where 1 is a ring-shaped piezoelectric vibrator and 2 is a frame body. Reference numeral 3 is a spring member, 4 is a sliding member, 5 is a rotor, and 7 is a case. Since these configurations are the same as those in the above-described embodiment, the description thereof is omitted, but in this embodiment, the case 7 is used. Bearing 1
2 and 13 are provided, and the rotating shaft 14 is supported by the bearings 12 and 13, and the rotating shaft 14 is provided in the rotor 5.
Is supported by a support member 15 mounted through substantially the center.

In the ultrasonic motor of this embodiment having the above-mentioned structure, the rotation shaft 14 is rotated by the rotation of the rotor 2 and power can be taken out.

Although an example in which the bearings 12 and 13 are provided has been shown, the bearings 12 and 13 may be impregnated with lubricating oil in order to miniaturize the ultrasonic motor.

FIG. 7 is a plan view of an ultrasonic motor according to still another embodiment of the present invention. FIG. 8 is a side sectional view of the ultrasonic motor of FIG. The frame member 3, the spring member 4, the sliding member 5, the rotor 5, and the case 7 have the same structure as the above-mentioned embodiment,
Although not described, in the present embodiment, a gear 16 is formed on the outer periphery of the rotor 5, a part of the gear 16 is projected from the hole 7c of the case 7, and the gear 16 is rotatable by the rotary shaft 17a. The supported gear 17 is engaged.

In the ultrasonic motor of this embodiment having the above structure, when the gear 16 is rotated by the rotation of the rotor 5,
Since the gear 17 engaged with the gear 16 rotates, the power can be taken out by the gear 17.

In the above embodiment, the ring-shaped piezoelectric vibrator 1 is used. However, when a disk-shaped piezoelectric vibrator is used instead of the ring-shaped piezoelectric vibrator 1, the disk-shaped piezoelectric vibrator is used. If it is directly fixed to the protruding portion 6a of the case 6, it can be used similarly.

Further, the piezoelectric vibrator 1 is not limited to the above-mentioned conventional one, and a large number of electrodes are provided on the surface of the piezoelectric vibrator, and piezoelectric vibration for supplying a voltage with a phase difference of 90 degrees to these electrodes. A child can be used.

As described above, in the ultrasonic motor of the present invention, by using a thin ring-shaped or disk-shaped piezoelectric vibrator, the motor can be miniaturized, and a rotating body or a moving body can be obtained. Or you can drive the gears directly,
Further, when the supply of electric power is stopped, it is immediately stopped, so that there is an advantage that it can be used as it is for positioning control and rotation of the volume or the like.

[Brief description of drawings]

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

FIG. 2 is a side sectional view of the ultrasonic motor shown in FIG.

FIG. 3 is a plan view of an ultrasonic motor according to another embodiment of the present invention.

FIG. 4 is a side sectional view of the ultrasonic motor shown in FIG.

FIG. 5 is a plan view of an ultrasonic motor according to still another embodiment of the present invention.

6 is a side sectional view of the ultrasonic motor of FIG.

FIG. 7 is a plan view of an ultrasonic motor according to still another embodiment of the present invention.

8 is a side sectional view of the ultrasonic motor of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ring-shaped piezoelectric vibrator 2 frame 3 spring member 4 sliding member 5 rotor 6 member with high friction coefficient 7 case 8 rotor 9 10, roller 11 moving body 12, 13 bearing 14 rotary shaft 15 support member 16 gear

Claims (5)

[Claims] 1. One end of a plurality of spring members is integrally formed or adhered or fixed to the inside of a ring-shaped frame, and a sliding member is integrally formed or adhered to the other end of the spring member. An ultrasonic motor comprising a rotor, wherein a sliding member of the rotor is pressed against an end face of a thin ring-shaped or disc-shaped piezoelectric vibrator. 2. The outer periphery of the rotor is formed of a member having a high friction coefficient, and the member having a high friction coefficient is brought into contact with a rotating body to take out power by the rotation of the rotor. The ultrasonic motor according to claim 1. 3. The ultrasonic motor according to claim 1, wherein the member having a high coefficient of friction of the rotor is brought into contact with a moving body that moves linearly to move the moving body linearly by the rotation of the rotor. .. 4. The ultrasonic motor according to claim 1, wherein the rotor is provided with a support member for passing the center thereof, and a rotary shaft is attached to the support member. 5. The ultrasonic motor according to claim 1, wherein a gear is integrally or adhesively provided on the outer circumference of the rotor, and another gear is engaged with the gear.