Optical data recording/reproducing method and apparatus for determing an optimum recording power
US5790505A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Sep 11, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical data recording/reproducing method in which data is recorded for testing in a pattern including a not-recorded section and a recorded section as changing a recording power P onto an optical data recording medium from time to time, An amplitude m of the recorded data corresponding to the recording power P is monitored by reproducing the data recorded for testing. A standardized gradient g(P) is calculated from the following expression: EQU g(P)=(.DELTA.m/m)/(.DELTA.P/P) or h(P) is calculated from the following expression: EQU h(P)=(.DELTA.m/m)/.DELTA.P wherein .DELTA.P indicates a minute change rate near P and .DELTA.m indicates a minute change rate corresponding to .DELTA.P near m, and an optimum recording power is decided and set by evaluating whether the recording power is too high or too low according to the standardized gradient g(P) or h(P).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.