Registers – Records
Patent
1989-06-28
1990-04-10
Trafton, David L.
Registers
Records
235454, 235488, 369283, G06K 1900
Patent
active
049163000
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.
REFERENCES:
patent: 4340959 (1982-07-01), Levin
patent: 4754128 (1988-06-01), Takeda et al.
Patent Abstracts of Japan, vol. 9, No. 127 (P-360) (1850), May 31, 1985; JP A 60 008 993 (Fujitsu K.K.) 1/17/85.
Omron Tateisi Electronics Co.
Trafton David L.
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