Phase change optical disk and method for using the same

Details Phase change optical disk and method for using the same Phase change optical disk and method for using the same

1990-02-15

1994-01-04

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, 360114, G11B 1112

Patent

active

052766705

ABSTRACT:
A phase change optical disk in which the thermal conductivity of a first region at an outer peripheral position of the disk is set at a value larger than the minimum value of that of a second region. In the optical disk, in order to provide an output characteristic of a uniform reproduced signal when the disk is rotated at a fixed rotation speed, toward an outer peripheral position thereof, the critical cooling rate of a recording film is set at a larger value or the temperature which the recording film is to reach is set at a lower value. Provided is a method of using the phase change optical disk for recording or erasing information, in which method, the power of the laser beam to be directed to an inner peripheral position of the disk is set larger than that directed to an outer peripheral position thereof.

REFERENCES:
patent: 5128910 (1992-07-01), Iida

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