Galvanomirror and optical disk drive using the same
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United States of America Patent
Stats
-
Apr 14, 1998
Grant Date -
N/A
app pub date -
Nov 22, 1996
filing date -
Nov 24, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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