Information recording method using a modulated recording beam at

Details Information recording method using a modulated recording beam at Information recording method using a modulated recording beam at

1989-05-31

1992-01-28

Envall,, Jr.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369 4433, 369121, G11B 7125

Patent

active

050848577

ABSTRACT:
The present invention relates to a method of recording on a rewritable recording medium using a laser beam capable of producing at least three discreet levels of power. The three levels of power used for writing to the recording medium is greater than the power required for reading. The present method is unique in that the power level of the laser beam is modulated between high, intermediate, and low levels over a time period so that at least three discreet power levels are radiated to the recording medium during recording. The increment of the radiation energy of the upward pulse from the intermediate level toward the high level is within the range of 0.8 to 1.2 times the decrement of the radiation energy of the downward pulse from the intermediate level to the low level. The present invention provides high density recording capability with minimum non-erasure areas even when the recording medium is formed from a high velocity crystallization (high speed erasure).

REFERENCES:
patent: 4710911 (1987-12-01), Yamada et al.

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