Optically readable/writable card
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 10, 1990
Issued Date -
N/A
app pub date -
Jun 28, 1989
filing date -
Apr 15, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optically readable/writable card has such a structure that a transparent protection layer is laminated so as to cover a recording medium layer on a card substrate. A recess portion is formed in the transparent protection layer at the position over the recording medium layer. The flat bottom surface of the recess portion is located lower than the card surface. With this recess portion, the transparent protection layer over the recording medium layer is protected from scratches because it is difficult to be come into contact with the card casing or the like, so that the recorded information can be accurately certainly read out or written.
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Cited Art Landscape
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