Record carrier for a magneto-optical disc memory having guide gr

Details Record carrier for a magneto-optical disc memory having guide gr Record carrier for a magneto-optical disc memory having guide gr

1987-05-21

1991-01-15

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692752, 3692754, G11B 1112, G11B 1304, G11B 724

Patent

active

049858815

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 flat portions therebetween. Each flat portion between the tracks 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 a respective sector is formed in advance with pits of a phase structure and a data portion adjacent to the header portion. The guide groove serves as an optical guide for a light beam which records, reproduces and erases information onto the data portion.

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Horigome et al, "Novel Stamper Process for Optical Disc", SPIE vol. 899 Optical Storage Technology and Applications (1988), pp. 123-128.
Togami et al, "Amorphous Thin Film Disk for Magneto-Optical Memory", SPIE vol. 329 Optical Disk Technology (1982), pp. 208-214.

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