G - Physics – 11 – B
Patent
G - Physics
11
B
42/2
G11B 7/24 (2006.01) C23C 14/20 (2006.01) G11B 7/243 (2006.01)
Patent
CA 1237279
21 ABSTRACT OF THE DISCLOSURE An information medium adapted to be written by thermo-optical means comprising a heat-sensitive structure adapted to store information to be read by optical means. This includes a thin metal layer, which, when incident writing radiation impinges on it, causes a transient localized temperature rise. Above a temperature threshold this causes a change in the optical characteristics of the heat-sensitive structure. The information medium is manufactured by a method involving depositing a continuous thin film of polycrystalline aggregate over an acceptor surface of the aforementioned structure by means of an incident flux of particles of a precious metal and a transition metal. In order to obtain a defined metallic composition, these metal particles are extracted from at least one target exposed to bombardment by other particles resulting from an electrical discharge in a rare gas at reduced pressure and confined by a magnetic field. The acceptor surface collects these metal particles with a residual energy content giving rise to a density of nucleation sites increased relative to that for a similar deposit obtained by vacuum evaporation. The maximum distance between the target and the acceptor surface is preferably not more than twenty centimeters, and advantageously not more than ten centimeters.
488219
Goudreau Gage Dubuc
Societe Anonyme Dite: Alcatel Thomson Gigadisc
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