Optical information recording-reproducing apparatus
US5010534A · kind A · utility
15Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1989 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Aug 29, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an optical card recorder-reader, in which erroneous signal recording, caused by a low-level light beam when it is stopped at a position for a prolonged period between writing and/or reading operation, either by interruping the irradiation, or by reducing the power of irradiation, or by placing the light beam outside the recording area, when the recording or reading operation is not in progress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.