Device for scanning optical discs using phase detection in a sys

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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369 4435, 369 4436, G11B 7095

Patent

active

060848359

ABSTRACT:
Tracking error signal in an optical read/write device, such as a CD ROM, are fine tuned for deviations in the positions of the lens structure normal to the recorded medium to provide more precise tracking control. Track error signal is developed by means of DPD-TE circuitry, using for example, signals from a four quadrant photodetector. Selected pairs of the signals from the photodetector are summed and the sums are differenced to develop an intermediate signal. The intermediate signal is amplified with a gain proportional the reciprocal of the intensity of light received by the photodetector, and thereafter combined with the track error signal to provide a corrected track error signal.

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