Apparatus and method for detecting beam power in optical drive
US7068933B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2002 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Mar 27, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam power received by the light-receiving unit according to the selected gain, and outputs the beam power amplified as a detected beam power. According to the apparatus and method, received beam power (or amplification gain) is amplified by a gain determined according to the characteristics of the respective light sources. Thus, it is possible to provide the detected beam power in consideration of a sufficient dynamic range for the each light source, thereby realizing effective APC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.