Magnetooptic disc apparatus and recording medium
US5642343A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1993 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | Jul 9, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1258
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical method for recording, reproducing, and erasing a digital signal of a mark length recording system onto/from an optical recording medium such as an optical disc or the like eliminates a fluctuation of the edge position of the reproduction signal due to heat interference between pits, thereby reducing a fluctuation of the edge position due to a fluctuation of external environmental conditions. For this purpose, there are proposed the following methods: 1) the shape of the recording pulse waveform is controlled, 2) the density at which data is recorded to the disc is variably set in accordance with the disc position, 3) a test recording is executed prior to recording user data, and the like. With these methods, a superhigh density optical recording can be realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.