Optical state recognizer, information processor, and optical state recognizing method
US7680007B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 2005 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Dec 22, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc device (100) implements information processing with respect to, for example, a zeroth recording layer of an optical disk by an information processing section (510), and outputs a double-layer main voltage value and a double-layer sub voltage value corresponding to the intensities of a zeroth-order light beam and ±first-order light beams which are received by a photodetecting element (350) to an offset calculating section (522) by a voltage value acquiring section (521). The voltage value acquiring section (521) stores voltage values corresponding to the intensities of the zeroth-order light beam and ±first-order light beams which are received by the photodetecting element (350) as a single-layer main voltage value and a single-layer sub voltage value in a memory (400) in a state where a single-layer disc is loaded. The offset calculating section (522) calculates a voltage value corresponding to the intensity of a stray light beam that is reflected by a first recording layer not intended for information processing as an offset voltage value on the basis of the respective voltage values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.