Optical pickup apparatus having switch for allowing positional a

Details Optical pickup apparatus having switch for allowing positional a Optical pickup apparatus having switch for allowing positional a

1988-03-28

1990-11-20

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369120, 369124, G11B 709

Patent

active

049724002

ABSTRACT:
The invention comprises an optical pickup apparatus including a photodetector which detects a laser beam reflected from information tracks of a disk and an amplifier circuit which amplifies the outputs of the photodetector. The photodetector and the amplifier circuit are integrally combined. A preamplifier circuit is also provided for positional adjustments. A switch is included within the amplifier for alternately inhibiting the path of the outputs of the photodetector to the amplifier circuit to allow for positional adjustment with the preamplifier and enabling the path of the outputs of the photodetector to the amplifier circuit for normal operation.

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