Input sensor unit for a fingerprint identification system

Details Input sensor unit for a fingerprint identification system Input sensor unit for a fingerprint identification system

1980-08-11

1982-07-20

Punter, William H.

Optics: measuring and testing

Document pattern analysis or verification

G06K 900, G06K 920

Patent

active

043403000

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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