Opto-magnetic disk unit with improved dynamic range characterist

Details Opto-magnetic disk unit with improved dynamic range characterist Opto-magnetic disk unit with improved dynamic range characterist

1989-01-17

1991-07-23

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 47, 360 59, G11B 1304, G11B 1112

Patent

active

050349341

ABSTRACT:
An opto-magnetic disk unit is constructed so that predetermined areas existing in the front of the unit recording areas can be detected. In addition, at least one of first and second saturation magnetizations are recorded on each of the detected predetermined areas. At the time of reproduction, signal processing on the output of the pickup is performed after a part of the output of the pickup corresponding to the one section of the predetermined area is clamped to a predetermined level. Also at the time of reproduction, gain controlling of a circuit for signal processing the output of the pickup may be performed based on the level difference between the signal read from a first saturation magnetization section and the signal read from a second saturation magnetization section. An opto-magnetic disk is also provided having recording areas including at least one of first and second magnetization saturation levels arranged in the front of the unit recording areas.

REFERENCES:
patent: 4730289 (1988-03-01), Saitoh et al.
patent: 4733385 (1988-03-01), Henmi et al.
patent: 4764916 (1988-08-01), Mori
patent: 4789972 (1988-12-01), Oldham

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