Optical disc recorder with recording modality switching for...

Details Optical disc recorder with recording modality switching for... Optical disc recorder with recording modality switching for...

2006-08-08

2006-08-08

Korzuch, William R. (Department: 2656)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053370, C369S053260, C369S053270

Reexamination Certificate

active

07088665

ABSTRACT:
An error detector circuit compares a value corresponding to a laser power supplied from a monitor diode of an optical pickup with a value representative of a target laser power, and outputs an error from the target value to a change-over switch. The change-over switch selects one of low-pass filters used for CAV recording and CLV recording. The low-pass filter used for CAV recording has a larger time constant than that of the low-pass filter used for CLV recording. The servo gain of a servo loop during the CAV recording is therefore set smaller than that of a servo loop during the CLV recording. A change in the laser power becomes gentle.

REFERENCES:
patent: 4660189 (1987-04-01), Tsukamura et al.
patent: 5315402 (1994-05-01), Ito et al.
patent: 5579294 (1996-11-01), Ohta et al.
patent: 6259662 (2001-07-01), Matsui
patent: 6687202 (2004-02-01), Watanabe et al.
patent: 6711107 (2004-03-01), Chao et al.
patent: H08-185663 (1996-07-01), None
patent: 2000-173089 (2000-06-01), None
patent: H11-232772 (2001-07-01), None

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