Galvanomirror and optical disk drive using the same

Details Galvanomirror and optical disk drive using the same Galvanomirror and optical disk drive using the same

1996-11-22

1998-04-14

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

057401500

ABSTRACT:
An optical disk drive has a drive unit for driving a disk and an optical head for focusing a laser beam onto the disk. The optical head has a light source for emitting the laser beam, a galvanomirror for correcting a light passage of the emitted laser beam, and a lens for focusing the laser beam from the galvanomirror onto the disk. The galvanomirror has a rocking portion being electrically chargeable, and one surface of the rocking portion having a reflection surface for reflecting the laser beam. The rocking portion is rockably supported by first end portions of supporting portions. Second end portions of the supporting portions are connected to a second plate (fixing portion). The second plate has an opposed portion opposed to the other surface of the rocking portion with a predetermined gap interposed. Electrically chargeable electrodes are provided on the opposed portion of the second plate, for electrostatically driving the rocking portion thereby reflecting the laser beam at a desired angle. The other surface of the rocking portion is provided with recess portions for reducing an air pressure caused when the rocking portion is rocked.

REFERENCES:
patent: 4782474 (1988-11-01), Arai et al.

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