Magneto-optical disc memory apparatus including a header signal

Details Magneto-optical disc memory apparatus including a header signal Magneto-optical disc memory apparatus including a header signal

1990-11-21

1992-11-03

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369124, 369 54, 360 59, 360114, G11B 1304, G11B 1112, G11B 1110

Patent

active

051611350

ABSTRACT:
A record carrier for recording, reproducing and erasing information. A circular disc-like substrate has a recording layer thereon such that information is written onto the recording layer by changing the direction of magnetization. A guide groove of a plurality of tracks is formed in advance and extends in the radial direction with intervals therebetween. Each track of the guide groove is divided into a plurality of sectors, each of which includes a header portion in which a header signal containing an address for distinguishing at least said sector is formed in advance with pits of a phase structure and a data portion adjacent to said header portion. The guide groove serves as an optical guide for a light beam which records, reproduces and erases information onto the data portion. A first detection system for detecting the light intensity of the reflected light from the record carrier and a second detection system for detecting the direction of polarization of the reflected light from the record carrier, and a level adjustment circuit for adjusting the levels of the header signal detected by the first detection system and the data signal detected by the second detection system are incorporated in this apparatus, whereby recording, reproducing and erasing information of any number of sectors are enabled.

REFERENCES:
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patent: 4535439 (1985-08-01), Satoh et al.
patent: 4566088 (1986-01-01), Yoshida et al.
patent: 4985881 (1991-01-01), Saito et al.
patent: 4999824 (1991-03-01), Fuji et al.

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