Patent ID: 7619956
Filing Date: 2009-11-17
Classification: G11B

Abstract:
1. A calibration method for improving stability of a write control signal during writing in a CD recorder, wherein the CD recorder has a pickup device and a write control device for outputting the write control signal, the calibration method obtains a gain of the write control device, the gain is for controlling the write control signal, and the write control signal controls the pickup device to write a disk, the calibration method comprising: switching the pickup device to a de-focus state; switching the write control device to a close-loop mode and obtaining a first relationship curve showing a relationship between the write control signal and a light-emitting power generated by a laser diode; and switching the write control device to a long-term open mode and obtaining a second relationship curve showing a relationship between the gain and the write control signal, wherein if the pickup device adopts a specific light-emitting power to write, the CD recorder performs a method comprising: obtaining a specific write control signal corresponding to the specific light-emitting power according to the first relationship curve; and obtaining a specific gain corresponding to the specific write control signal according to the second relationship curve, such that the write control signal outputted by the write control device in the long-term open mode substantially equals the specific write control signal outputted by the write control device in the close-loop mode.