发明名称 |
System for optically identifying an object |
摘要 |
The object (X) to be identified is affixed with an identification medium (1) comprising a reflective layer consisting of a reflective hologram or diffraction grating. The high polymer cholesteric liquid crystal provides an inexpensive identification medium, and the use of the second light receiving unit for providing a reference signal provides a high S/N output signal which is highly distinct and resistant to the contamination of the identification medium. Also, the elimination of the need for expensive optical elements such as beam splitters also contributes to the reduction of cost. <IMAGE> |
申请公布号 |
EP1003126(A2) |
申请公布日期 |
2000.05.24 |
申请号 |
EP19990309101 |
申请日期 |
1999.11.16 |
申请人 |
NHK SPRING CO.LTD. |
发明人 |
HOSHINO, HIDEKAZU;TAKEUCHI, ITSUO;SHIBUYA, SEIYA |
分类号 |
B44F1/12;B42D15/10;G02B5/32;G06K7/12;G06K19/16 |
主分类号 |
B44F1/12 |
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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