Optical Recording Media
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
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 .