Laser power control apparatus and method, an optical disk...

Details Laser power control apparatus and method, an optical disk... Laser power control apparatus and method, an optical disk...

2008-05-06

2008-05-06

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S116000, C369S094000

Reexamination Certificate

active

07369469

ABSTRACT:
A laser power control apparatus is for use in an optical disk apparatus for recording information on an optical disk having at least a first layer and a second layer. The laser power control apparatus includes a power control section for controlling a laser element such that a power of a laser beam approaches a control target level; a change detection section for detecting that a recording condition for the optical disk has been changed; and a power adjustment section for adjusting the power of the laser beam for a recording film of the first layer, in accordance with an output from the change detection section. The power adjustment section determines the power of the laser beam for a recording film of the second layer, based on the power of the laser beam which has been adjusted for the recording film of the first layer.

REFERENCES:
patent: 5608715 (1997-03-01), Yokogawa et al.
patent: 6049521 (2000-04-01), Aratani
patent: 6667947 (2003-12-01), Maeda et al.
patent: 6865147 (2005-03-01), Hosokawa
patent: 2004/0085874 (2004-05-01), Akiyama et al.
patent: 2005/0226116 (2005-10-01), Kubo et al.
patent: 2000-311346 (2000-11-01), None

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