Input sensor unit for a fingerprint identification system
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United States of America Patent
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-
Jul 20, 1982
Grant Date -
N/A
app pub date -
Aug 11, 1980
filing date -
Aug 11, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed an input sensor unit for a fingerprint verification system. A sensor plate facing a fingerbed is composed of a transparent polymer which is elastic so as to form a latent topographic relief of a finger pattern. A sensing light beam is coupled into the sensor plate through one edge surface. An output light beam emitted through a planar surface of the sensor plate at the opposite side of the fingerbed is directed onto the light sensitive area of an electro-optical sensing array. In the optical path of the output light beam there is arranged an optical lens for focusing the output light beam onto the light sensitive area and an optical filter for masking out the direct light of the output light beam.
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