Playing laser power control method in optical disc device

Abstract

The invention relates to a method for controlling a playing laser power of a compact disc device. For example, when data playing operation is executed in DVD recorder and various compact disc devices, a RF signal wobble value read and played in the compact disc can be detected at any time, and at the same time when the detected RF signal wobble value exceeds a predefined standard value, the playing laser power is gradually increased. The playing laser power can be controlled to be compensated into a suitable state according to played RF signal wobble value such that the stable playing operation which is irrelevant to media material of the compact disc is executed, while a series of automatic laser power control operations are executed by compensating the laser power variation following the temperature variation in a light picker.

Description

technical field [0001] The present invention relates to the laser power control method of playing in the optical disc device, especially refers to in various types of optical disc devices such as DVD video recorder (DVD-Recorder), for the data control playing laser power (Read Laser) recorded in the optical disc for playing Power) is a method for controlling playback laser power in an optical disc device that changes in time. Background technique [0002] Generally, in various types of optical disc devices such as DVD recorders that can record and save high-quality video data and high-quality audio data for a long time, such as figure 1 Shown includes an optical pickup 11, for example, the above optical pickup 11 includes an objective lens 110, a coil 111, an electron beam splitter 112, a laser diode 113, a light receiving element 114, an automatic laser power control board circuit 115 (ALPC), etc. . [0003] In addition, the above-mentioned objective lens 110 moves up, do...

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Problems solved by technology

[0006] But even if the laser power change is compensated according to the temperature change in the above-mentioned optical pickup, the quality of the corresponding playback signal is different due to the media material of the optical disc currently being played. The quality of playing RF signals is low, and errors will occur during data playback.

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