发明名称 |
OPTICAL CARD HAVING LIGHT-ABSORBING LAYER |
摘要 |
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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申请公布号 |
CA1331402(C) |
申请公布日期 |
1994.08.09 |
申请号 |
CA19890601991 |
申请日期 |
1989.06.07 |
申请人 |
KYODO PRINTING CO., LTD. |
发明人 |
FUJITA, MINORU;FUKUSHIMA, YOICHI |
分类号 |
B42D15/10;G06K19/06;G11B7/0033;G11B7/24;(IPC1-7):G11B7/24 |
主分类号 |
B42D15/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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