Browse Prior Art Database

Optical Recording Media

IP.com Disclosure Number: IPCOM000042168D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kuech, TF: AUTHOR

Abstract

An optical recording medium is made up of a three-layer structure wherein there is a transparent surface layer, a reflecting intermediate layer and an underlayer, all supported by a backing. The three layers respond chemically or physically to localized heat, such as a focused laser, such that a spot becomes non-reflecting and covered by a transparent film whereby recording in the intermediate layer occurs through an encapsulating layer. Examples are: Surface layers and underlayer of B-A12O3 and intermediate layer of Ag, Na or Li. In this example, local heating causes the intermediate layer to diffuse rapidly into the surface layer locally removing the reflecting intermediate layer, thus producing a recorded spot. Surface layer and underlayer of CaCl2 and the intermediate layer of Ir2O3 .

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Optical Recording Media

An optical recording medium is made up of a three-layer structure wherein there is a transparent surface layer, a reflecting intermediate layer and an underlayer, all supported by a backing. The three layers respond chemically or physically to localized heat, such as a focused laser, such that a spot becomes non-reflecting and covered by a transparent film whereby recording in the intermediate layer occurs through an encapsulating layer. Examples are: Surface layers and underlayer of B-A12O3 and intermediate layer of Ag, Na or Li. In this example, local heating causes the intermediate layer to diffuse rapidly into the surface layer locally removing the reflecting intermediate layer, thus producing a recorded spot. Surface layer and underlayer of CaCl2 and the intermediate layer of Ir2O3 . In this example, the reaction is chemical. The localized heat drives H2O from the Ir2O3 to the CaCl2, rendering it non-reflective. This reaction is reversible under uniform heating.

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