System for recording and playing back information with magneto-optical disk memory using record and readout light beams of different wavelengths
US4549287A · kind A · utility
17Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10536
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a system for recording and playing back information utilizing a magneto-optical disc memory having a vertical magnetization film on and from which the information is recorded and read out by an optical means. In order to simplify the construction of the system, an optical system including an objective lens and a tracking mirror is used both as a part of an optical path of a recording light beam and a part of an optical path of a readout light beam. The wavelengths of the recording light beam and the readout light beam are selected to be different so that the light beams are easily discriminated in the optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.