Optical card

Details Optical card Optical card

1991-09-06

1992-05-05

Pitts, Harold

Registers

Records

Laminated

235468, 235487, 235491, G06K 1402

Patent

active

051110334

ABSTRACT:
In an optical card, a card substrate has its rigidity which is sufficient to handle the card substrate independently. The card substrate has a first side which serves as a reading side upon which reading light is incident. An optical-data recording section includes a light-reflective pattern. The optical-data recording section is arranged on one of the first and second sides of the card substrate. Optical data incident upon the optical-data recording section toward the reading side of the card substrate is recorded by the optical-data recording section. A shielding layer is arranged on one of the first and second sides of the card substrate, for shielding the optical-data recording section from a viewer's field of view. The shielding layer has its transmission characteristic with respect to the reading light, which is sufficient to shield light within a visual range and to enable reading of the optical-data recording section.

REFERENCES:
patent: 3829662 (1974-08-01), Furahashi
patent: 4694148 (1987-09-01), Diekemper
patent: 4831244 (1989-05-01), Slafer et al.

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