Information recording apparatus having automatic focusing
US4556965A · kind A · utility
3Cited by
16References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1981 |
| Grant date | Dec 3, 1985 |
| Priority date | — |
| Expiry date | Mar 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0909
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an information recording apparatus for recording predetermined information on a recording medium by means of a laser beam, an optical system and a light detector are arranged for detecting a reflected version of the laser beam from the recording medium, whereby the focusing of the laser beam on the recording medium is automatically controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.