Track control circuit for optical card recording/reproducing app

Details Track control circuit for optical card recording/reproducing app Track control circuit for optical card recording/reproducing app

1993-07-12

1994-03-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4429, 369 4436, G11B 7095

Patent

active

052933652

ABSTRACT:
In a track control circuit for an optical car recording/reproducing apparatus, a light beam for optically recording or reproducing information is incident on a desired track of an optical card having a plurality of tracks through a focusing lens. A beam reflected by a desired track of the optical card is detected by a photosensor, and a track error signal is generated as a signal representing a deviation of the reflected beam. A track actuator moves the focusing lens in horizontal and vertical directions so as to position the focusing lens on the track of the optical card in accordance with a track error signal gain-controlled by a variable gain amplifier. The variable gain amplifier receives a control signal from a CPU so as to change the gain of the track error signal in accordance with the amplitude of the generated track error signal.

REFERENCES:
patent: 4616353 (1986-10-01), Kaneda et al.
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 5023860 (1991-06-01), Ueda
patent: 5048002 (1991-09-01), Horie et al.
patent: 5109367 (1992-04-01), Yoshikawa
patent: 5138596 (1992-08-01), Yamada
patent: 5146443 (1992-09-01), Iwase et al.

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