Drive circuit for ultrasonic motors
AssigneeNikon Corporation
InventorRyoichi Suganuma
Life of this patent
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Abstract
A drive circuit for an ultrasonic motor, which comprises a stator for generating a progressive oscillatory wave to an elastic element with the drive of a piezoelectric element and a moving element to be pressurized by the stator and driven with the progressive oscillatory wave, comprises an inductive element which is inserted between a power source and an input of the ultrasonic motor, and a switching element which is connected between one end of said inductive element connected to said input and a ground, and performs switching with a drive frequency of said ultrasonic motor.
Claims4
A drive circuit for an ultrasonic motor which comprises a stator for generating a progressive oscillatory wave to an elastic body with the drive of a piezoelectric element and a moving element to be pressurized by the stator and driven with the progressive oscillatory wave, comprising:
- first and second inductive means which are connected in series and inserted between a power source and an input of said ultrasonic motor;
- switching means which is connected between the junction of said first and second inductive means and a ground, and performs switching with a drive frequency of said ultrasonic motor;
- and
- capacitive means which is connected in parallel with said switching means.
Dependencies are inferred from the claim text.