Patent ID: 6638593
Filing Date: 2003-10-28
Classification: G11B,Y10T

Abstract:
A multi-layer optical medium comprising:a substrate having a first major surface and a second major surface, said first major surface having information pits and lands thereon; a metal reflector layer, said metal reflector layer being disposed along the information pits and lands; a polymeric film positioned over said metal reflector layer, said polymeric film comprising light-changeable material; wherein said metal reflector layer has a plurality punctuate discontinuities therein that permit laser light directed through said second major surface to impinge on the light-changeable material polymeric film; wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being converted in the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first a optical state.