Phase change optical disk initializing apparatus
US6278674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1997 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Dec 10, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An initializing apparatus includes a laser light source for emitting an erasing laser light for initializing an optical disk, a laser drive circuit for driving the laser light source according to an AC waveform signal, an optical system for irradiating the optical disk with the erasing laser light and track address detecting circuitry for detecting the track address. Furthermore, the laser light source, the laser drive circuit and the optical system are previously adjusted so that an amorphous portion having a size of 1/2 or less of a wavelength of the erasing laser light may be formed at the inside of a melting re-crystallization portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.