JP3224141B2 - Ultrasonic motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic motor for rotating a rotor by pressing a sliding protrusion of the rotor against an end face of a thin ring-shaped piezoelectric vibrator by the elasticity of an elastic frame. Things.

[0002]

2. Description of the Related Art The applicant of the present invention has formed electrodes on both sides of a ring-shaped vibrator or a disk-shaped vibrator, provided a groove at the center of these electrodes, divided each electrode into two, and formed an angle of the groove. And proposes an ultrasonic motor that generates a traveling wave on the side and both sides of the ring-shaped vibrator or disc-shaped vibrator by applying AC voltage to one electrode of each of the two divided electrodes. (See Japanese Patent Application Laid-Open No. Sho 3043077).

[0003]

By the way, in this ultrasonic motor, the driving body is brought into contact with one surface of the ring-shaped vibrator or the disc-shaped piezoelectric vibrator, so that the electrodes are driven. , The electrode is easily worn.

[0004]

SUMMARY OF THE INVENTION The present invention provides a case, a ring-shaped piezoelectric vibrator in which a protrusion formed inside the case is inserted and fixed in a center hole, and a circular elastic part with a part cut away. A rotor provided with a plurality of sliding protrusions inside a frame having elasticity, wherein the sliding protrusions provided on the frame having elasticity of the rotor are provided on an end face of the ring-shaped piezoelectric vibrator. The portion is pressed against the elasticity of the frame having elasticity, and the rotor is rotated by the traveling wave of the ring-shaped piezoelectric vibrator,
Power is taken out from the rotor, and a supporting member for passing the center thereof is provided on a frame of the rotor, a rotating shaft is mounted on the supporting member, and the supporting member is provided on a projecting portion of the case and a case cover. The rotating shaft is supported by a bearing, and rotational power is taken out from the rotating shaft.Moreover, a projecting hole is provided in the case, and a member having a high coefficient of friction is mounted on the outer periphery of the rotor, and the coefficient of friction is reduced. The rotating member is rotated by projecting a high member from the projecting hole of the case and bringing the member having a high coefficient of friction into contact with the rotating member. A member having a high coefficient of friction is attached to the outer periphery, the member having a high coefficient of friction is projected from the projecting hole of the case, the member having a high coefficient of friction is brought into contact with a moving body that moves linearly, and the rotation of the rotor Said move The case is provided with a protruding hole, a gear is mounted on the outer periphery of the rotor, the gear is protruded from the protruding hole of the case to engage with another gear, and the other It rotates gears.

[0005]

According to the present invention, the elastic frame of the rotor is opened from the notch at the end face of the ring-shaped or disc-shaped piezoelectric vibrator, and the sliding protrusion of the rotor is performed by the elasticity of the elastic frame. The part is pressed against the end face of the ring-shaped or disk-shaped piezoelectric vibrator.

When AC 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 vibrator. Rotate the child.

[0007] If a rotating shaft is mounted on the rotor, power can be taken out from the rotating shaft, and a member having a high friction coefficient is adhered or integrally fixed to the outer periphery of the rotor.
When a gear is formed on the outer periphery of the rotor, a member or a part of the gear is protruded from the case, and a rotating body or a linear moving body or another gear is brought into contact with the protruding member or the gear, the rotating body and the linear moving body are formed. Alternatively, power can be extracted from other gears.

[0008]

FIG. 1 is a plan view of an ultrasonic motor according to an embodiment of the present invention, in which a plurality of sliding projections 2b are provided so as to project from the inner surface of a frame 2a, and a rotor 2 is constructed. The frame 2a of the rotor 2 is made of an elastic member, and a notch 2c is formed in an appropriate portion of the elastic frame 2a. The notch 2c is opened to open the elastic frame. When the plurality of sliding protrusions 2b of the body 2a are fitted to the end face of the ring-shaped piezoelectric vibrator 1, the sliding protrusions 2b are formed on the end face of the ring-shaped piezoelectric vibrator 1 by the elasticity of the elastic frame 2a. Is pressed.

The rotor 2 is a ring-shaped piezoelectric vibrator 1
A guide 2d is provided on the opposing sliding protrusion 2b so as not to come off.

The support member 3 is fixed substantially across the center between the opposed guides 2d of the rotor 2, and the rotating shaft 4 is fixed to the support member 3. At this time, the support member 3 is fixed.
The notch 2c is formed on one side of the frame 2a, but the piezoelectric vibrator 1 is pressed at a portion separated by two of the frame 2a, and the frame 2a uniformly presses the piezoelectric vibrator 1 over the entire body. There is no uneven pressing between the piezoelectric vibrator 2 and the piezoelectric vibrator 1.

Further, the protruding portion 5a of the case 5 is inserted into the hole 1a of the ring-shaped piezoelectric vibrator 1, and the ring-shaped piezoelectric vibrator 1 is fixed to the case 5. The rotating shaft 4 is supported by the provided bearing 6 and the bearing 7 provided on the case cover 5b opposed thereto.

In the thus constructed ultrasonic motor of this embodiment, when AC power is supplied to the electrodes (not shown) of the ring-shaped piezoelectric vibrator 1, the rotor 2 rotates, thereby rotating the rotating shaft 4. Rotate.

In the ultrasonic motor of the present embodiment, the thickness of the ring-shaped piezoelectric vibrator 1 can be made from 1 mm to 1.5 mm, so that the size of the ultrasonic motor can be extremely reduced. As soon as the power supply is cut off, it does not require braking means like a normal electric motor, it can be used to rotate the volume of audio equipment or used for other control equipment .

Although the bearings 6 and 7 are provided, these bearings 6 and 7 are used to reduce the size of the ultrasonic motor.
Lubricating oil may be impregnated.

FIG. 3 is a plan view of an ultrasonic motor according to another embodiment of the present invention, and FIG. 4 is a side sectional view of the ultrasonic motor of FIG. 3, where 1 is a ring-shaped piezoelectric vibrator and 2 is a rotor. Numerals 5 and 5 denote cases, which are the same as those in the above embodiment, and a description thereof will be omitted. In this embodiment, a member 8 having a high coefficient of friction is adhered or integrally fixed to the outer periphery of the rotor 2. Then, a part of this member 8 is projected from the projection hole 5c of the case 5,
The end surface of the rotating body 9 on which the rotating shaft 9a is supported is in contact with the member 8.

In the thus constructed ultrasonic motor of the present embodiment, when the rotor 2 rotates, the projecting hole 5a of the case 5 is formed.
The rotating body 9 that has come into contact with the member 8 having a high coefficient of friction is rotated, and power can be taken out from the rotating body 9.

FIG. 5 is a plan view of an ultrasonic motor according to still another embodiment of the present invention. FIG. 6 is a side sectional view of the ultrasonic motor of FIG. Rotor, 5
Is a case, and 8 is a member having a high coefficient of friction. Since these structures are the same as those in the above embodiment, the description is omitted, but in this embodiment, a part of the member 8 is protruded from the protruding hole 5c of the case 5. Is projected, and the supporting roller 1 opposed to the member 8 is
The moving body 12 supported by 0 and 11 is in contact.

In the thus constructed ultrasonic motor of this embodiment, when the rotor 2 rotates, the projecting hole 5a of the case 5
Since the moving body 12 in contact with the member 8 from which the is projected moves linearly, the moving body 12 can control positioning and the like.

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. Rotor, 5
Is a case, and these configurations are the same as those in the above embodiment, and therefore the description is omitted. In this embodiment, the gear 13 is provided integrally or bonded to the outer periphery of the rotor 2, and A notch 13a is provided at the same portion as the notch 2c of the second gear 2, and a part of the gear 13 projects from the projecting hole 5c of the case 5, and a gear 14 supported by the projected gear 13 by a rotating shaft 14a.
Are engaged.

In this embodiment constructed as described above, when the gear 13 is rotated by the rotation of the rotor 2, the projection hole 5 of the case 5 is formed.
The gear 14 engaged with the gear 13 from which a protrudes rotates, and power can be taken out from the rotating shaft 14a.

Further, the guide 2d is provided on the protruding portion 2b opposed thereto, but it may be provided on each protruding portion 2b or on the frame 2a.

In the above embodiment, the protruding portion 2b has a rectangular contact surface with the piezoelectric vibrator 1. However, the contact surface may have an arc shape or a pointed shape. The piezoelectric vibrator 1 is not limited to the piezoelectric vibrator shown in the above-described conventional example, but may be a piezoelectric vibrator provided with a plurality of electrodes and supplying voltages having a phase shift of 90 degrees from each other.

Further, since the frame 2a is made of a metal or a synthetic resin, a member having a high coefficient of friction is bonded to the outer periphery of the frame 2a. However, the frame 2a itself is made of a member having a high coefficient of friction. If the surface has a high coefficient of friction, there is no need to bond other members.

Further, in the embodiment shown in FIG. 7, the gear 13 is bonded or integrally formed on the outer periphery of the rotor 21. The gear 13 is also formed of a resilient material, and the degree of opening of the notch 13 is increased. Alternatively, the gear 14 may be rotated by 360 degrees.

[0025]

As described above, in the ultrasonic motor of the present invention, the motor can be miniaturized by using the thin ring-shaped piezoelectric vibrator. Can be rotated to directly drive a rotating body or a moving body, and when power supply is stopped, it stops immediately, so it can be used as it is for positioning control and rotation of a volume, etc. There are advantages.

[Brief description of the 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 of FIG. 1;

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 of FIG. 3;

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

FIG. 6 is a side sectional view of the ultrasonic motor of FIG. 5;

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. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring-shaped piezoelectric vibrator 2 Rotor 3 Supporting member 4 Rotating shaft 5 Case 6, 7 Bearing 8 Member with high friction coefficient 9 Rotating body 10, 11 Roller 12 Moving body 13, 14 Gear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02N 2/00

Claims (5)

(57) [Claims] 1. A case, a ring-shaped piezoelectric vibrator in which a protrusion formed inside the case is inserted into a center hole and fixed, and a circular elastic frame having a part cut away inside the case. A frame comprising a rotor provided with a plurality of sliding projections, wherein the sliding projection provided on the end face of the ring-shaped piezoelectric vibrator is provided on the elastic frame of the rotor. An ultrasonic motor which is brought into pressure contact with the elasticity of a body, rotates the rotor by a traveling wave of the ring-shaped piezoelectric vibrator, and extracts power from the rotor. 2. A supporting member for passing the center thereof is provided on a frame of the rotor, a rotating shaft is mounted on the supporting member, and the rotating shaft is supported by a bearing provided on a projecting portion of the case and a case cover. 2. The ultrasonic motor according to claim 1, wherein rotational power is taken out from said rotary shaft. 3. A case in which a projecting hole is provided in the case, a member having a high coefficient of friction is mounted on the outer periphery of the rotor, and the member having a high coefficient of friction is projected from the projecting hole of the case, so that the high coefficient of friction is obtained. The ultrasonic motor according to claim 1, wherein the rotating body is rotated by bringing the member into contact with the rotating body. 4. A protruding hole is provided in the case, a member having a high coefficient of friction is mounted on the outer periphery of the rotor, and the member having a high coefficient of friction is protruded from the protruding hole of the case to increase the coefficient of friction. The ultrasonic motor according to claim 1, wherein the member is brought into contact with a moving body that moves linearly, and the moving body moves linearly by rotation of the rotor. 5. A protruding hole is provided in the case, a gear is mounted on the outer periphery of the rotor, and the gear is protruded from the protruding hole of the case to engage with another gear, thereby rotating the other gear. The ultrasonic motor according to claim 1, wherein: