发明名称 |
UNEVEN-SURFACE DATA DETECTION APPARATUS |
摘要 |
UNEVEN SURFACE DATA DETECTION APPARATUS An uneven surface data detection apparatus for detecting an uneven surface, such as a human finger, having projected portions and recessed portions. A transparent base having upper and lower surfaces and an upper surface defining an uneven surface contact portion is provided, and a light is incident on the uneven surface so that the light derived from the recess portions enters to the transparent base and comes out thereof. However, a part of the light derived from the projected portions is totally reflected at least one time by the lower opposite surface and focussing lens is integrally formed on the transparent base so that the totally reflected light is drawn out of transparent base and enters to an image sensor. |
申请公布号 |
CA1319433(C) |
申请公布日期 |
1993.06.22 |
申请号 |
CA19890603337 |
申请日期 |
1989.06.20 |
申请人 |
FUJITSU LIMITED |
发明人 |
KATO, MASAYUKI;IGAKI, SEIGO;YAMAGISHI, FUMIO;IKEDA, HIROYUKI;SHINZAKI, TAKASHI |
分类号 |
A61B5/117;G06K9/00 |
主分类号 |
A61B5/117 |
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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