Simultaneous MO and ROM optical disk signal detection

Details Simultaneous MO and ROM optical disk signal detection Simultaneous MO and ROM optical disk signal detection

1992-06-15

1993-11-23

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

369124, 369 4435, 369 4429, 360114, G11B 1112, G11B 1304

Patent

active

052650855

ABSTRACT:
A circuit for simultaneously detecting both MO and ROM signals reflected from an optical disk so that both signals are present and useable without switching from one to the other. The circuit eliminates switching time and switching transients. Two photodetectors are arranged to sense P and S components of polarized light in order to stimulate a differential amplifier and produce an output representative of MO recorded data. A second amplifier is connected to at least one of the photodetectors to produce an output representative of ROM recorded data and also representative of defects in the MO portion of the optical disk.

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