Optical disk apparatus
US8094527B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2008 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Jun 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/121
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc apparatus includes: a first signal generating portion which generates a first signal that is obtained by processing signal which is output from the photo detecting portion, and which shows a peak in case where a focus position of an objective lens is matched on a recording surface of an optical disc; a second signal generating portion which generates a second signal that is obtained by slicing the first signal at a prescribed level to be digitalized; and a movement stopping portion which stops moving of the objective lens if the second signal is asserted by existence of the recording surface that is a target to be reproduced or to be recorded, then it is negated, and the state to be negated is continued for a prescribed time interval when focus control is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.