Heat shut off condition determination method and apparatus for o

Details Heat shut off condition determination method and apparatus for o Heat shut off condition determination method and apparatus for o

1993-10-19

1996-01-23

Psitos, Aristotelis

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369 59, G11B 1112, G11B 1304

Patent

active

054870593

ABSTRACT:
In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto a magnetooptical recording medium is raised from an intensity P.sub.pre for maintaining a pre-heat state, in which the temperature on the medium surface has a predetermined temperature .THETA..sub.pre, to an intensity P.sub.W1 higher than P.sub.pre so as to form a mark on the medium, the intensity is reduced to an intensity P.sub.LB lower than P.sub.pre, and after an elapse of a time T.sub.off, the intensity is raised to P.sub.pre. At least one of P.sub.pre, T.sub.off, and P.sub.LB is controlled to achieve the pre-heat state within a time period until the intensity is raised to P.sub.W1 again to form the next mark.

REFERENCES:
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patent: 4894816 (1990-01-01), Sukeda et al.
patent: 4938915 (1990-07-01), Saito
patent: 4972337 (1990-11-01), Eguchi et al.
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Patent Abstracts of Japan, vol. 14, No. 569 (P-1144) 18 Dec. 1990 (JP-A-02 244 443).
Patent Abstracts of Japan, vol. 11, No. 178 (P-584) 9 Jun. 1987 (JP-A-62 008 371).
Standard ECMA/TC31/92/36, European Computer Manufacturers Association, 3rd Draft Proposal, Sep. 1992, "Information Interchange on Second Generation 130 mm Optical Disk Cartridges, Rewritable and Worm, Using the Magneto-Optical Effect, and Read Only" (two pages).

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