Method of producing an optical recording card having a hologram contained therein
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United States of America Patent
Stats
-
Apr 23, 1991
Issued Date -
N/A
app pub date -
Apr 14, 1989
filing date -
Oct 15, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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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