Information recording medium and apparatus using reversible phas

Details Information recording medium and apparatus using reversible phas Information recording medium and apparatus using reversible phas

1988-04-08

1991-01-01

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

049823965

ABSTRACT:
An information recording method and apparatus therefor utilizes an information recording medium having a recording film enabling reversible phase change. The information recording medium is irradiated with an energy beam while relatively moving the information recording medium and the energy beam so as to at least enable recording of information in accordance with phase state changes of the recording film caused by irradiation of the energy beam. The energy beam is modulated so that an intensity of the energy beam obtains a first level having a high power for one portion of coded data information to be recorded, obtains a second level different from the first level for a predetermined time for another portion of the coded data information, and then again obtains the first level to enable recording of the coded data information independently of a previous recording state on the information recording medium.

REFERENCES:
patent: 3774702 (1988-09-01), Giacomel
patent: 4712207 (1987-12-01), Reno
patent: 4799208 (1989-01-01), Satoh et al.

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