Optical card

Details Optical card Optical card

1987-11-17

1991-01-08

Pitts, Harold

Registers

Records

Laminated

235385, 235457, 235487, G06R 1902

Patent

active

049838199

ABSTRACT:
In an optical card having a card substrate on which binary data are recorded by a portion having high reflectivity and a portion having low reflectivity, a background portion is formed by a material having low reflectivity. Therefore, even if a positional relation between a light receiving region of a light receiving element and a bit portion is varied, the data can be accurately read out. Further, since the background portion can be formed by the printing method or the photo developing method and can be used for the other of binary data, the optical card can be manufactured in an inexpensive manner without generating a skew.

REFERENCES:
patent: 4157784 (1979-06-01), Grottrup
patent: 4254329 (1981-03-01), Gokey
patent: 4598196 (1986-07-01), Pierce
patent: 4730293 (1988-03-01), Pierce
patent: 4782221 (1988-11-01), Brass
Japanese Patent Appln. Laid-Open No. 61-214,152.

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