Information recording apparatus and method

Details Information recording apparatus and method Information recording apparatus and method

1989-06-28

1992-08-04

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, G11B 7125, G01D 1514

Patent

active

051365731

ABSTRACT:
An information recording apparatus includes a record signal processor for converting information to be recorded into an analog signal having three levels or more, a laser beam source for emitting a laser beam whose power is modulated at multiple levels in accordance with the three levels or more of the processed signal, and an optical system for focusing/radiating the laser beam on an information recording medium. The information recording medium has a recording layer. The laser beam whose power is modulated at the multiple levels is radiated on the recording layer. As a result, a plurality of phases having different crystallinities are obtained in a radiated portion in accordance with the laser power, and hence multi-level information is recorded in the data recording medium. The recorded information can be reproduced by detecting optical characteristics in these phases.

REFERENCES:
patent: 4647950 (1987-03-01), Nosaki et al.
patent: 4773059 (1988-09-01), Minemura et al.
patent: 4938915 (1990-07-01), Saito

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