Information medium adapted to be written by thermo-optical means

Details Information medium adapted to be written by thermo-optical means Information medium adapted to be written by thermo-optical means

1985-08-02

1987-04-21

Herbert, Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

346 76L, 3461351, 346137, 427 35, 427 37, 428336, 428461, 428913, B32B 1504, B32B 1508, B05D 306

Patent

active

046596208

ABSTRACT:
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.

REFERENCES:
patent: 4414273 (1983-11-01), Wada et al.
J. A. Thornton (1), Metal Finishing, "Sputter Deposition onto Plastics", Jul. 1976, pp. 46-51.
J. A. Thornton (2), Metal Finishing, "Sputter Deposition onto Plastics", Aug. 1976, pp. 32-34, 40.
Patent Abstracts of Japan, vol. 3, No. 143 (E-154), Nov. 27, 1979, pp. 44E 154, J.P.-A-54 121 154, (Sharp K.K.), 20-09-1979.

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