Optical recording and/or reproducing apparatus

Details Optical recording and/or reproducing apparatus Optical recording and/or reproducing apparatus

1990-07-23

1992-12-01

Envail, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4441, G11B 709

Patent

active

051684870

ABSTRACT:
An optical recording and/or reproducing apparatus comprising a light beam generator, a photodetector, an optical path forming device for causing a light beam from the light beam generator to impinge upon an optical disc and for guiding the light beam emanating from the optical disc to the photodector, and a signal generating circuit block operative to obtain based on a detection output obtained from the photodetector a first signal representing a tracking condition of the light beam in relation to a record track portion on the optical disc and a second signal different in phase by substantially ninety degrees from the first signal and to produce a tracking error signal which satisfies the following equation:

REFERENCES:
patent: 4722079 (1988-01-01), Matsumoto
patent: 4775968 (1988-10-01), Ohsato

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