Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1993-11-18
1994-11-15
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369110, 369 13, G11B 1112
Patent
active
053655087
ABSTRACT:
A magneto-optical read/write device having a radiation detection system which includes two radiation-sensitive detectors the outputs of which are connected via DC coupled current-to-voltage converters to an input of an adder circuit and an input of a subtracter circuit to obtain a sum signal and a difference signal. The sum signal on the output of the adder circuit is coupled to an input of a selection circuit via a capacitive coupling. The difference signal on the output of the subtracter circuit is coupled to another input of the selection circuit. The output of the selection circuit is coupled to a signal processing circuit via another capacitive coupling. The device is particularly suited for use with a magneto-optical record carrier having sector headers with a pre-arranged pit structure. When information areas between the sector headers are recorded and erased, the device maintains the intensity level at a constant read level during scanning of the sector headers and avoids production of undesired transition phenomena at the output of the selection circuit.
REFERENCES:
patent: 4837758 (1989-06-01), Motoyama et al.
patent: 5062091 (1991-10-01), Maeda et al.
Dzierzynski Paul M.
Eason Leroy
U.S. Philips Corporation
Wong Don
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