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Browse Prior Art Database

Optical Memory Device

IP.com Disclosure Number: IPCOM000077840D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Ruane, RE: AUTHOR

Abstract

Copper, when treated in a solution of cupric chloride, exhibits a sensitivity to actinic radiation and produces readily visible images when exposed. Image erasure is effected by heat.

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Optical Memory Device

Copper, when treated in a solution of cupric chloride, exhibits a sensitivity to actinic radiation and produces readily visible images when exposed. Image erasure is effected by heat.

In the figure, a display panel 1 is constructed by evaporating or laminating a copper film 2 onto a quartz substrate 3, and immersing the copper in concentrated cupric chloride to produce a photosensitive film. Thereafter, the substrate is rinsed and dried. The quartz substrate is laminated at its uncoated surface to another quartz substrate 4, but with a serpentine electrical resistance element 5 between the two substrates. A transparent protective film 6, such as polyester film, is then applied to the composite panel.

Recording is done on the panel by selectively exposing the treated copper surface to actinic radiation of approximately 4000 Angstroms wavelength from source 7. Radiation may be from a xenon tube, laser or mercury arc producing suitable wavelength. Erasure is accomplished by attaching an energy source 8 across the resistance element 5 and heating the panel until the images disappear. Erasure time varies with the temperature used, which may be from 250-400 degrees F. Erasure does not degrade the sensitivity of the surface to recording, so that repeated record-erase cycles can be performed.

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