Acousto-optical intensity control of laser beam during etching of optical servo information of magnetic media
US5279775A · kind A · utility
43Cited by
9References
10Claims
0Family size
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Key dates
| Filing date | Jun 10, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Jun 10, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/82
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The intensity of a beam of light used to etch concentric servo tracks on a magnetic medium is adjusted with an acousto-optical device to maintain a substantially constant energy density delivered by the beam while the optics which generate the beam move radially of the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.