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

1995-09-12

1996-10-01

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369116, 369 59, G11B 1100

Patent

active

055616429

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: 4843604 (1989-06-01), Fujiwara et al.
patent: 5339298 (1994-08-01), Saito
patent: 5396480 (1995-03-01), Morishita et al.
patent: 5412626 (1995-05-01), Ohno et al.
patent: 5430696 (1995-07-01), Tokita et al.
patent: 5457666 (1995-10-01), Toda et al.

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