Method for erasing recording in a PHB memory
US4855951A · kind A · utility
3Cited by
2References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1987 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Oct 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/249
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A desired portion of information stored in the form of holes using hole burning phenomena is erased by irradiating a desired portion of a recording medium with light so as to erase desired holes. In this way it is possible to erase selectively only desired information among information stored in a PHB memory and further to rewrite information in the portion, where information has been erased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.