Pulse train condition/heat shut off condition determination meth

Details Pulse train condition/heat shut off condition determination meth Pulse train condition/heat shut off condition determination meth

1993-10-19

1996-01-02

Nguyen, Viet Q.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4439, 369100, 369126, 369284, G11B 7125

Patent

active

054815258

ABSTRACT:
This invention relates to an optical recording method and apparatus, in which the intensity of a laser beam to be radiated onto an optical recording medium is raised from an intensity P.sub.pre for maintaining a pre-heat state in which the temperature of the medium surface becomes a predetermined temperature, to P.sub.W1 higher than P.sub.pre, the intensity is reduced to an intensity P.sub.LT lower than P.sub.W1 after P.sub.W1 is maintained for a time T.sub.W1, and thereafter, the laser beam is intensity-modulated between P.sub.LT and an intensity P.sub.W2 higher than P.sub.LT so as to form a mark on the optical recording medium. When at least one of P.sub.W2, P.sub.LT, and a time T.sub.W2 for maintaining P.sub.W2 is controlled, the medium temperature, after an elapse of T.sub.W1, at the peak temperature position or the spot center position of the laser beam radiated onto the medium surface is equal to the medium temperature after an elapse of T.sub.W2.

REFERENCES:
patent: 4438443 (1984-03-01), Doev et al.
patent: 4722522 (1988-09-01), Van Tongeren et al.
patent: 4852077 (1989-07-01), Clark et al.
patent: 4916465 (1990-04-01), Van Tongeren et al.
patent: 5321682 (1994-06-01), Spruit et al.
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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