JP2519061B2 - Ultrasonic drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic drive device that rotates a driven body forward and backward.

2. Description of the Related Art The applicant of the present application holds a piezoelectric vibrator 1 such as a ceramic vibrator between a long metal block 2 and a short metal block 3 as shown in FIG. , A stator 5 of an ultrasonic drive device, which is fixed by tightening bolts 4 provided with 4b, 4b, has been proposed.

When an AC power supply 6 is connected to the input terminals 1a, 1b of the vibrator 1 of the stator 5 as shown in FIG. 3 and an AC voltage is applied, the screws 4a, 4b of the bolt 4 are right-handed respectively. In some cases, elliptical vibrations are generated on the side surfaces of the metal blocks 2 and 3 in the arrow directions, and elliptical vibrations are generated on the end surfaces in the opposite directions of the arrows on both side surfaces. Further, as shown in FIG. It was found that the magnitude of vibration occurs as shown by the length of the arrow. Then, it was found that when the rotating body is brought into contact with the position where these elliptical vibrations occur, the rotating body rotates.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the ultrasonic driving device configured as described above, if the rotating body is brought into contact with the portion of the stator 5 where elliptical vibration is generated, the rotating body rotates only in one direction, There is a problem that it is not possible to change the current direction and rotate forward and backward like a general electric motor.

Means for Solving the Problems In order to solve the above problems, according to the present invention, two metal oscillators each having a piezoelectric vibrator such as a ceramic vibrator sandwiched between three metal flocs and screws provided at both ends thereof are provided. This is characterized in that the metal blocks are fixed to each other with the above bolts, the screws of the above two bolts are cut into opposite threads, and the driven body is combined with the end face or the side face.

Effect According to the present invention, when an AC voltage is applied to one piezoelectric vibrator such as a ceramic vibrator, the rotating body brought into contact with the end face or the side face rotates in the direction determined by the screw of one bolt, and When an AC voltage is applied to the other piezoelectric vibrator, the rotating body rotates in the opposite direction determined by the other screw.

First Embodiment FIG. 1 is a cross-sectional view of an ultrasonic driving device according to a first embodiment of the present invention. Piezoelectric vibrators 7 and 8 such as ceramic vibrators are three metal blocks 9, 10 and 11 having substantially the same length. Bolts which are sandwiched by and are provided with screws 12a, 12b, 13a, 13b at both ends between the metal blocks 9, 10 and the metal blocks 10, 11.
Tighten with 12 and 13 to be united, but these bolts 12
The screws 12a and 12b and the screws 13a and 13b of the bolt 13 are cut in the opposite directions.

The rotating body 14 is brought into pressure contact with the end surface of the metal block 9 of the stator 14 configured as described above, and the AC power supply 15 switches to the switch 16
When an AC voltage is applied from the terminal 7a to the piezoelectric vibrator 7 via the, the bolt 12 rotates in the threaded direction of the bolt 12 as shown by the arrow A, and the switch 16 is switched to change the terminal from the AC power supply 15 to the terminal.
When an AC voltage is applied to the piezoelectric vibrator 8 through 8a, the bolt 12 having a screw in the opposite direction to the bolt 12 causes the rotor to rotate.
14 rotates in the direction of arrow B. When the rotating body 14 is brought into contact with the end surface of the metal block 11, the rotating body 14 rotates in the same manner as above.

As described above, since the rotating body 14 can be normally or reversely rotated by applying the AC voltage to either the piezoelectric body vibrator 7 or 8 by the switch 16 of the present embodiment, it can be used in the same manner as the conventional electric motor. can do.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, when an AC voltage is applied to one of the ceramic vibrators, the rotating body brought into contact with the end face or the side face is screwed with one bolt. Rotate in the direction determined by, and when an AC voltage is applied to the other piezoelectric vibrator, the rotor will rotate in the opposite direction determined by the other screw, so use the same as a conventional electric motor. In addition to the advantages, the structure is simple, a large torque can be obtained, and the structure is simple.

[Brief description of drawings]

FIG. 1 is a sectional view of an ultrasonic wave drive device according to an embodiment of the present invention,
2 is a cross-sectional view of the stator of the ultrasonic drive device proposed by the applicant, FIG. 3 is a side view of the ultrasonic drive device of FIG. 2, and FIG. 4 is a side view of the ultrasonic drive device of FIG. It is the figure which showed the magnitude | size of the circular vibration which generate | occur | produced in the stator by the arrow. 7, 8 ... Piezoelectric vibrator, 9, 10, 11 ... Metal block, 12, 13 ... Bolt, 14 ... Rotating body, 15 ... AC power supply, 16 ... Switch

Claims (1)

(57) [Claims] 1. A piezoelectric vibrator such as a ceramic vibrator is sandwiched between three metal blocks, and the two metal blocks are fixed to each other with two bolts provided with screws at both ends. An ultrasonic drive device characterized in that the screw of the bolt is cut to the opposite screw, and the driven body is combined with the end face or the side face.