Prepulse conditon/heat shut off condition determination method a

Details Prepulse conditon/heat shut off condition determination method a Prepulse conditon/heat shut off condition determination method a

1995-05-03

1996-12-03

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 360 59, 360114, G11B 700

Patent

active

055815359

ABSTRACT:
In an optical recording method and apparatus, 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 an intensity P.sub.W1 higher than P.sub.pre, and after P.sub.W1 is maintained for a time T.sub.W1, the intensity is reduced to an intensity P.sub.W2 lower than P.sub.W1 to form a mark on the optical recording medium. P.sub.W2 is controlled so that the medium temperature at a peak temperature position or a spot center position of the laser beam radiated onto the medium surface after an elapse of the time T.sub.W1 becomes constant even after the intensity is reduced to P.sub.W2, and at least one of P.sub.pre, T.sub.off, and P.sub.LB is controlled to establish the pre-heat condition within a time period until the intensity is raised to P.sub.W1 again so as to form the next mark.

REFERENCES:
patent: 5331612 (1994-07-01), Murakami et al.
patent: 5420837 (1995-05-01), Saito et al.
patent: 5428594 (1995-06-01), Izumi et al.
patent: 5457666 (1995-10-01), Toda et al.
patent: 5463600 (1995-10-01), Kirino et al.
Aoki et al., "Magnetooptical Memory of High Rate and High Density (Preemphasis)," IEEE Translation Journal on Magnetics in Japan, vol. 3, No. 7, Jul. 1988, pp. 541-542.

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