Optoelectronic signal recording medium and method of making same

Details Optoelectronic signal recording medium and method of making same Optoelectronic signal recording medium and method of making same

1989-08-30

1991-11-05

Welsh, David

Static information storage and retrieval

Radiant energy

428689, 428698, 428699, 428700, 428702, 430 60, 430 84, 354 3, 423600, G11C 1300

Patent

active

050635387

ABSTRACT:
An optoelectronic signal recording and storage medium including a base layer, a conductive layer, a photoconductive layer and storage layer has a coherent crystal morphology throughout, even though the chemical and electrical properties of its layers are by choice dramatically different. The base layer is preferably made of monocrystalline sapphire grown in a manner as to allow the growth of the other layers directly on a surface of the base layer without the need to grind and polish that surface, thereby minimizing internal defects in the medium. The monocrystalline base layer also allows the acceptance of exeptionally uniformly distributed charges over wide areas of the medium, thereby enabling the medium to locally record and store minutely differing optoelectronic signals on a background of minimal noise, thus facilitating low light level electronic or optical recording and long term storage of signals and minimal energy readout of those stored signals. The medium base layer can be thin enough to be flexible and transparent and yet to have great strength to provide a firm foundation for the other medium layers. A method of making the medium is also disclosed.

REFERENCES:
patent: 4812352 (1989-04-01), Debe
patent: 4862414 (1989-08-01), Kuehmle

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