G - Physics – 11 – B
Patent
G - Physics
11
B
42/2
G11B 7/24 (2006.01) G06K 19/06 (2006.01) G11B 7/245 (2006.01)
Patent
CA 1263533
ABSTRACT OF THE DISCLOSURE An information recording card using a semiconductor laser beam for writing and reading information. The card has a recording layer formed on a card substrate so as to closely cover at least a selected surface area of the substrate and may have a reflective metal layer on the back side of the recording layer. The material of the recording layer is a polymer blend which exhibits phase transition and resultant changes in light transmittance and reflectance by heating and which is either a binary polymer blend of a vinylidene fluoride (VDF) base polymer, either PVDF or a copolymer of VDF and another F- containing monomer such as TFE, and an acrylic or methacrylic polymer represented by PMMA or a ternary copolymer comprising a vinyl ester polymer in addition to the components of the binary polymer blend. The thermally caused phase transition is reversible by slow cooling in the case of the binary polymer blend but is irreversible in the case of the ternary polymer blend.
529099
Central Glass Company Limited
Maeda Kazuhiko
Robic Robic & Associes/associates
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