Registers – Records – Laminated
Patent
1989-04-14
1991-04-23
Levy, Stuart S.
Registers
Records
Laminated
235487, 283 86, G06K 1916, G06K 1918
Patent
active
050102435
ABSTRACT:
A certification card such as ID card or the like includes a hologram and an optical recording portion. Hologram is such that an amplitude and a phase of a light wave emitted from an object are recorded and an image of the object is rebuilt by emitting light to reproduce of an amplitude and a phase of the thus emmited light. An optical recording technique for use with the card employs data pits which are formed on an optical reflective surface of an optical recording layer. The thus formed data pits are detected by difference in optical reflectivity from the data pits when the object is illuminated by laser beam so that data are read. The card is constituted by adhering a card front substrate to a card rear substrate, and hologram and optical recording portion are formed between the card front substrate and the card rear substrate. The certification card is difficult to falsify and alter and, therefore, has high safety.
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patent: 3814904 (1974-06-01), Russell et al.
patent: 4014602 (1977-03-01), Ruell
patent: 4376887 (1983-03-01), Greenaway et al.
patent: 4677285 (1987-06-01), Taniguchi
patent: 4754128 (1988-06-01), Takeda et al.
patent: 4835376 (1989-05-01), Drexler
Fujita Minoru
Fukushima Yoichi
Haga Toshio
Kakinuma Yuji
Farber Martin A.
Kyodo Printing Co., Ltd.
Levy Stuart S.
Weinhardt Robert
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