Optical card having light absorbing layer

Details Optical card having light absorbing layer Optical card having light absorbing layer

1992-11-16

1993-12-21

Shepperd, John

Registers

Records

235488, 3692755, G06F 1900

Patent

active

052723267

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.

REFERENCES:
patent: 4683371 (1987-07-01), Drexler
patent: 4694148 (1987-09-01), Diekemper et al.
patent: 4754128 (1988-06-01), Takeda et al.

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