Optical card having light absorbing layer
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United States of America Patent
Stats
-
Dec 21, 1993
Issued Date -
N/A
app pub date -
Nov 16, 1992
filing date -
Jun 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A technique of optical card having high information recording density. In the optical cards, there are two types of optical cards having a read-only optical card and an additional recording optical card. Conventionally, separate readers for reproduction have been used due to difference in light reflectivity. In this invention, a light-absorbing layer (50) having light absorbing ability with respect to reading light (300) is arranged between a card side upon which the reading light is incident and a reflective surface of a pattern (21) of an optical data recording section (20), so that the optical cards have interchangeability therebetween in reading.
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