Method and system for optically recording and playing back information on a recording medium having magnetization film thereon
US4539662A · kind A · utility
31Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1982 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Jun 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a method and system for recording and playing back information utilizing a recording medium having a vertical magnetization film on and from which the information is recorded and read out by an optical means, characterized by changing the direction of the magnetic field applied on the recording medium during the application of a recording light beam so as to maintain the recording track of portions of the recording medium on which the previously recorded information is erased by the application of the recording light beam during editing operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.