Optical pickup driver having piezoelectric elements of...

Details Optical pickup driver having piezoelectric elements of... Optical pickup driver having piezoelectric elements of...

2007-02-27

2007-02-27

Dinh, Tan (Department: 2627)

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

C720S659000

Reexamination Certificate

active

10467060

ABSTRACT:
The present invention is directed to a drive device comprising an electromechanical transducer (25) attached to one end of a drive shaft (24) and adapted to be expanded and contracted in the axial direction of the drive shaft (24) in accordance with drive voltage to thereby allow the drive shaft (24) to undergo displacement in the axial direction thereof, and an optical pick-up (14) movably supported in the axial direction of the drive shaft (24) and moved along the drive shaft (24) as the result of the fact that the drive shaft (24) is caused to undergo displacement by the electromechanical transducer (25) to apply a drive voltage higher than that at the time of steady transfer to the electromechanical transducer (25) at the time of starting.

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