stability of a write control signal

Details stability of a write control signal stability of a write control signal

2004-11-17

2009-11-17

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053260, C369S116000

Reexamination Certificate

active

07619956

ABSTRACT:
A calibration method for improving stability of write control signal during writing can be applied in a CD recorder. The CD recorder has a pickup device having a laser diode, and a write control device for outputting a write control signal. A first relationship curve showing the relationship between the write control signal and a light-emitting power generated by the laser diode is obtained by switching the pickup device into a de-focus state and switching the write control device into a close-loop mode. A second relationship curve showing the relationship between a gain of the write control device and the write control signal is obtained by switching the write control device into a long-term open mode. When a specific light-emitting power is adapted to write, a specific write control signal and a specific gain corresponding to the specific light-emitting power is obtained according to the first and second relationship curves.

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