Optical reading or writing apparatus
US4881204A · kind A · utility
4Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Apr 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/34
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information-carrying medium having the form of a disc is rotated around a central axis. The temperature of the disc is controlled by a temperature-adjusting element facing the surface of the disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.