Patent ID: 6700857
Filing Date: 2004-03-02
Classification: G11B

Abstract:
An optical disk system for reproducing information stored on an optical disk, the system comprising:a microcontroller for generating a plurality of control signals for controlling the operation of the optical disk system; a light power adjusting apparatus for generating a light quantity control signal for controlling the quantity of light emitted to the optical disk using light quantity information related to the quantity of light reflected from the optical disk, in response to at least one of the plurality of control signals output from the microcontroller; and an optical pickup device for adjusting the quantity of light emitted from the optical disk in response to the light quantity control signal, receiving light reflected from the optical disk, and generating the light quantity information; wherein: the light quantity information comprises E and F beam signals which are used for generating a tracking error signal, and the light power adjusting apparatus comprises: a signal converter for receiving the E and F beam signals and converting them into voltage signals; a signal synthesizer for synthesizing the E and F beam voltage signals output from the signal converter and outputting the synthesized result as a tracking sum signal; a current difference detector for outputting a difference current signal corresponding to the difference between the tracking sum signal and a reference signal; and a current-to-voltage converter for converting the difference current signal into a converted voltage signal and outputting the converted voltage signal as the light quantity control signal.