Method for laser recording utilizing dynamic preheating
US4383261A · kind A · utility
25Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1980 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Aug 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved method and apparatus for laser recording of information onto a metal film by dynamically heating the film immediately prior to recording. A single track of information is recorded by directing two laser beams onto the film. An unmodulated preheat beam supplies energy to raise the temperature of the metal film to just below that required for recording. A modulated write beam then provides sufficient additional energy to selectively raise the temperature of the film to a necessary level for recording of data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.