Optical card having light-absorbing layer

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

G - Physics

11

B

352/57

G11B 7/24 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 1331402

A B S T R A C T 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.

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