Optical tracking system

Details Optical tracking system Optical tracking system

1982-07-14

1985-06-25

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

250202, G11B 2110, G11B 700

Patent

active

045258236

ABSTRACT:
A tracking system for optically tracking information tracks formed on a recording medium, comprising a comparator which generates a trigger signal when the light beam scanning the information track is located over an information pit, and a sample holding circuit which samples a deviation signal caused by the difference of reflection light intensities on two photo detectors at that time. The deviation signal obtained when the light beam is located over the information pit includes smaller error component caused by the displacement of the object lens during the tracking control, whereby the accurate tracking control can be achieved.

REFERENCES:
patent: 4268745 (1981-05-01), Okano
patent: 4338682 (1982-07-01), Hosaka
patent: 4346471 (1982-08-01), Hirosawa
patent: 4349901 (1982-09-01), Howe
patent: 4408314 (1983-10-01), Yokota

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