Data Recording Material for Optical Record
Original Publication Date: 1980-Dec-01
Included in the Prior Art Database: 2005-Feb-13
Black tin oxide is known to be unstable in the presence of heat and humidity and to revert to its lower oxidation state which is transparent. The relative humidity may be about 90 percent or less, and the temperature may be about 150 degrees F or less. The black oxide can be stabilized against this reversion by sealing it with an unsaturated oil, typically linseed oil. A high density data record is initially formed as a layer of black tin oxide on a suitable support. The oxide surface is exposed to a laser which heats the surface to about 150 degrees F in a spot of 1 micron diameter or less to convert the black tin oxide to its lower oxidation state, thereby displaying its underlying tin surface. The surface is then sealed with an unsaturated oil to preserve the recorded image.