Optical information recording and reproducing apparatus having a function of preventing overwrite recording
US5909414A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Jul 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0903
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording apparatus for at least recording information by irradiating an optical information recording medium having a plurality of information tracks with at least one light beam. The apparatus includes a recorder for recording information on the recording medium with an information recording light beam and a plurality of detecting elements for detecting reflected light from the recording medium. Also provided is a high-frequency component detector for detecting a high-frequency component of a signal corresponding to an output signal from at least one of the plurality of detecting elements. Also provided is a controller for stopping recording of information by the recorder when the high-frequency component detector detects the high-frequency component during recording of information by the recorder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.