Optical information recording and/or reproducing apparatus provi

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

1989-09-08

1992-08-18

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, G11B 7085, G11B 709

Patent

active

051405733

ABSTRACT:
An optical information recording and/or reproducing apparatus includes an optical head for recording and/or reproducing information by applying a light beam to an optical recording medium having a plurality of tracks, an actuator for relatively moving the light beam in a direction which intersects the tracks, an optical detector for detecting, by intersecting the tracks, a reflected or transmitted light of the light beam, which has been modulated, a peak holding circuit for holding a peak value of a signal detected by the optical detector, a bottom holding circuit for holding a bottom value of the detected signal, a circuit for obtaining an intermediate value of the held peak value and bottom value, and a comparison circuit for transmitting an on-track/off-track signal by making a comparison between the intermediate value and the detected signal.

REFERENCES:
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4410969 (1983-10-01), Maeda
patent: 4530079 (1985-07-01), Millar
patent: 4637003 (1987-01-01), Yokogawa
patent: 4849953 (1989-07-01), Nomura et al.
patent: 4974220 (1990-11-01), Harada

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