Galvanomirror and optical disk drive using the same
US5740150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Nov 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08564
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.