Disk reproduction device
US7242651B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2001 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Jan 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a disk playback device wherein a disk (1) is irradiated with a laser beam from an optical head (4) to reproduce signals from the disk, and which comprises an external synchronizing signal producing circuit (8) and a delay circuit (12) for producing a reproduction synchronizing signal providing reference timing at which a reproduced signal is detected by reading an output signal from the optical head (4), a circuit (7) for detecting the reproduced signal by reading the output signal from the optical head (4) based on the reproduction synchronizing signal, and a system controller (10) for determining an optimum phase for a normal reproduction operation by altering the phase of the reproduction synchronizing signal and executing a reproduction operation, the controller (10) being operable to make a phase adjustment for the reproduction synchronizing signal prepared by the delay circuit (12). A normal reproduction operation can be performed at all times by assuring the reproduction synchronizing signal of the optimum phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.