Optical information recording apparatus including error checking circuit
US4308612A · kind A · utility
28Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1979 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Dec 20, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In apparatus wherein a predetermined information signal is recorded on an optical disk by the use of a light beam; an information recording apparatus characterized by provision of a light detector for detecting reflected light caused by the reflection of the light beam by the optical disk, and a checking circuit for detecting the duration for which a maximum peak value of the output from the light detector exists, the recorded state of information on the optical disk being detected on the basis of the output from the detector by the checking circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.