Optical information apparatus and method of recording and erasing information
US4718053A · kind A · utility
21Cited by
6References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1985 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Nov 6, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/24308
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention employs as a recording medium a metal or alloy which exhibits an intercrystalline transition before and after writing. In the present invention, two light beams of unequal wavelengths are used so as to write information with the light beam of the longer wavelength and to erase information with the light beam of the shorter wavelength. In changing a written content, a wavelength with which the reflection rate of the recording medium increases is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.