Claims
- 1. A control device for an ultrasonic linear motor for controlling to drive said ultrasonic linear motor to a target position according to a driving signal having a resonance frequency of said ultrasonic linear motor, said control device comprising:
- detecting means for detecting a moving position of said ultrasonic linear motor;
- a control unit for outputting a control pulse having a duty ratio changing from 100% to 0% until said ultrasonic linear motor reaches said target position from a start position, according to a detection data from said detecting means;
- an AND circuit for inputting said driving signal and said control pulse;
- a driving circuit for driving said ultrasonic linear motor according to an output signal from said AND circuit;
- a pair of legs substantially parallel to each other;
- an oscillator having a body portion connecting said legs, said body portion being disposed perpendicular to said legs and forming a pair of corner portions where the body portion is connected to the legs; and
- a pair of piezoelectric elements disposed at the corner portions of the body portion, wherein each piezoelectric element is oriented at an angle of 45.degree. with respect to both the body portion and each respective leg.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-325257 |
Dec 1989 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/601,963, filed Oct. 22, 1990.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
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Parent |
601963 |
Oct 1990 |
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