Detecting light spot movement direction for an optical disk

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

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369 46, G11B 700

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active

048721530

ABSTRACT:
The peak value of upper envelope of an optical disk read signal is detected, and a signal indicative of the detected peak value or upper envelope is used to correct the total reflected light amount signal. That is to say, two output signals delivered from a pair of horizontally symmetrical photo detectors, which detect the reflected light of a light spot, added together, and furthermore a signal indicative of the result of this addition is added to the signal indicative of the peak value or upper envelope to produce a total reflected light amount signal which is not influenced by the pits on the optical disk.

REFERENCES:
patent: 4338682 (1982-07-01), Hosaka et al.
patent: 4506149 (1985-03-01), Utsumi
Japanese Patent Abstract 58-91536, (English Translation) May 31, 1983.

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