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US 7,612,473 B2Granted
Driving device and method
AssigneeSony Corporation
InventorsNobukazu Suzuki, Gen Ichimura, Masaru Uryu, Yoshio Ohashi
Life of this patent
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Abstract
A driving device has a magnetostrictive actuator that drives a load member based on a driving signal, a sensor that detects an action of the load member, and a compensation unit that performs feedback compensation on the driving signal which the magnetostrictive actuator receives, based on a detection signal that is received from the sensor.
Claims3
The driving device, comprising:
- a magnetostrictive actuator that drives a load member based on a driving signal;
- a sensor that detects an action of the load member;
- and
- a compensation unit that performs feedback compensation on the driving signal which the magnetostrictive actuator receives based on a detection signal that is received from the sensor, wherein the compensation unit includes
- a phase compensation circuit that locks a phase of the detection signal from the sensor into a phase of the driving signal;
- a low-pass filter that removes from the detection signal of the sensor a high-frequency component thereof;
- an equalizer that previously corrects a fluctuation in frequency characteristic of the driving signal, said fluctuation occurring at the feedback compensation;
- and
- a subtracter that subtracts the detection signal of the sensor, said detection signal having been phase-locked in the phase compensation circuit and the high-frequency component of the detection signal having been removed by the low-pass filter, from the driving signal, a frequency characteristic of which has been corrected by the equalizer, thereby getting the compensated driving signal.
6 more elements
A driving device, comprising:
- a magnetostrictive actuator that drives a load member based on a driving signal;
- a sensor that detects an action of the load member;
- and
- a compensation unit that performs feedback compensation on the driving signal which the magnetostrictive actuator receives based on a detection signal that is received from the sensor, wherein
- the sensor includes a ring-shaped piezoelectric element,
- the magnetostrictive actuator has a driving rod that transmits a displacement output, the driving rod being composed of a rod having circularly sectional configuration and having on a middle portion thereof a disc having a large diameter, and
- the piezoelectric element is positioned at a position between the disc and the load member with a front end of the driving rod contacting the load member, the piezoelectric element being sandwiched between two ring-shaped members that are made of the same material as that of the load member.
4 more elements
Dependencies are inferred from the claim text.