Method for feedback adjusting laser power of read head of optical disk drive and reated set

Abstract

This invention relates to a method relevant device for feedback adjusting laser power of optical disc machine pick-up head. The said read head can adjust voltage of a laser generator according to a control signal to alter laser power. The method includes to feedback and renew the said control signal according to the said voltage or control signal to adjust the laser power.

Description

technical field [0001] The invention provides a method and related device for feedback controlling the laser power of the read head of an optical disc drive, in particular to a method or related device for feedback controlling the power of the read head according to the voltage of the laser diode or the magnitude of the laser control signal. Background technique [0002] Optical discs with light weight, convenient storage, low cost and large storage capacity have become one of the most important non-volatile storage media in the modern information society. To read the data on the optical disc, it is necessary to use a CD drive; how to make the performance of the CD drive more stable and reliable has become the focus of research and development in the information industry. [0003] Please refer to figure 1 . figure 1 It is a functional block diagram of a conventional optical disc drive 10 . The optical disk drive 10 is provided with a motor 14 , a pickup head 16 , a contro...

AI Technical Summary

Problems solved by technology

If the laser power output by the read head 16 is too large, the laser power reflected by the optical disc 12 will also increase; the high-level reflected signal will drive the transistor in the control circuit 18 to the edge of the normal work area, which will easily make the waveform of the signal distortion, and introduces non-linear effects that make it difficult for the above-mentioned feedback control to work correctly

If the laser power output by the read head 16 is too small, the reflected laser signal will also be small, which is easily affected by noise, and the above-mentioned feedback control of the optical disc drive cannot work correctly.

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