G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.4
G11B 7/00 (2006.01) G11B 5/62 (2006.01) G11B 5/82 (2006.01) G11B 7/241 (2006.01)
Patent
CA 1155546
ABSTRACT OF THE DISCLOSURE A multi-layer information recording medium for storing large amounts of information in a prescribed pattern of microscopic pits, formed by focusing onto the medium a beam of radiation having a prescribed wave- length and having an intensity modulated by the infor- mation to be recorded. The record medium includes a substrate having a light-reflective surface on its upper side, a light-absorptive dielectric layer overlaying the substrata and having a thickness approximately equal to an odd integral multiple of one fourth the wavelength of the beam of radiation in the dielectric material, and a thin metallic layer overlaying the dielectric layer and having a light-reflective surface on its lower side. During recording of the information, a substantial propor- tion of the intensity-modulated beam of radiation is transmitted through the metallic layer to the dielectric layer where it is confined,due to multiple internal reflections by the light-reflective surfaces of the substrate and the metallic layer, until it is finally absorbed by the dielectric material. This causes an evaporation of the dielectric material whenever the inten- sity of the beam exceeds a predetermined threshold, such evaporation carrying away the overlaying portions of the metallic layer and creating the prescribed pattern of microscopic information-bearing pits.
345722
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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