Optical magnetic memory device utilizing non-recorded portions o

Details Optical magnetic memory device utilizing non-recorded portions o Optical magnetic memory device utilizing non-recorded portions o

1988-07-01

1990-07-03

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 369124, G11B 1304, G11B 1112

Patent

active

049397109

ABSTRACT:
An optical magnetic memory device includes an optical magnetic recording medium such as a disc having recording magnetic film at least on one side thereof and initialized in a certain direction in advance, a recording section for recording data in such a manner that data-recorded portions and non-recorded portions are alternately formed, and a reproducing section for reproducing data from the recording medium by detecting the interval between the recorded or non-recorded portions. The reproducing section comprises a detector for detecting positive and negative peaks of signals reproduced from the recorded or non-recorded portion and a selector for selecting either of the detection outputs from the detector according to a control signal.

REFERENCES:
patent: 3513457 (1970-05-01), Nelson
patent: 3696346 (1972-10-01), Zook
patent: 4472748 (1984-09-01), Kato et al.
patent: 4475183 (1984-10-01), Marchant et al.
patent: 4586161 (1986-04-01), Skoda
patent: 4663676 (1987-05-01), Voegeli
patent: 4688203 (1987-08-01), Koishi et al.
patent: 4737947 (1988-04-01), Osato et al.

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