Disk playback device

Details Disk playback device Disk playback device

2006-09-12

2006-09-12

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047520, C369S047530

Reexamination Certificate

active

07106678

ABSTRACT:
The present invention provides a disk playback device comprising a laser drive circuit15for feeding a drive signal to an optical head4and adjusting the power of a laser beam irradiated by the optical head4, an error correcting circuit11for detecting an error rate of a reproduced signal, and a system controller10for controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correction circuit11. The system controller10retrieves one limit value of two limit values of a reproduction power wherein the error rate is not beyond a prescribed value, and calculates an optimum reproduction power based on the one limit value retrieved. Accordingly it is possible to move to signal reproduction in a short period of time and to reproduce signals with high accuracy by setting the optimum reproduction power.

REFERENCES:
patent: 5796704 (1998-08-01), Nanba et al.
patent: 6519212 (2003-02-01), Ashinuma
patent: 3-116566 (1991-05-01), None
patent: 08-221760 (1996-08-01), None
patent: 8-221760 (1996-08-01), None

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