Read/write optical memory

Details Read/write optical memory Read/write optical memory

1989-07-31

1991-09-24

Fears, Terrell W.

Static information storage and retrieval

Radiant energy

Photoconductive and ferroelectric

365112, 365117, G11C 1122, G11C 1142

Patent

active

050519506

ABSTRACT:
An improved read/write optical disk is disclosed which is capable of being rewritten more than 10.sup.6 times. The disk utilizes a storage medium in which data is stored as different polarization states in the same phase of the material. The preferred embodiment utilizes a lead lanthanum zirconate titanate material for the storage medium. The state of polarization of the material at the location of a specified data bit is changed by applying a voltage to the bit location in question. The location is specified by illuminating the surface of the disk with light in the infra-red.

REFERENCES:
patent: 3868653 (1975-02-01), Winter
patent: 3973247 (1976-08-01), Kumada et al.
patent: 4041477 (1977-08-01), Drenckhan

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