Fingerprint input apparatus
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United States of America Patent
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-
Feb 6, 2001
Grant Date -
N/A
app pub date -
Dec 4, 1997
filing date -
Dec 6, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fingerprint input apparatus includes a prism, a light source, a pinhole, and an imaging plane. The prism is placed such that a surface in one direction serves as a fingerprint collection surface. The light source irradiates light on the fingerprint collection surface through the prism. The pinhole is set in the path of light which is reflected by the pattern surface of a finger placed on the fingerprint collection surface and emerges from the prism. The light emerging from the prism and passing through the pinhole is formed into an image on the imaging plane. When the prism is substituted by air, an optical fingerprint collection surface equivalent to the fingerprint collection surface is set to be substantially parallel to the imaging plane.
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