Patent ID: 6069969
Filing Date: 2000-05-30
Classification: G06K

Abstract:
An optical system for acquiring a fingerprint image, comprising:a housing defining an imaging aperture;an incoherent light source directing light toward said imaging aperture at a non-normal angle;an array of light sensors to receive sensed working image signals indicative of a fingerprint image; anda platen affixed to said housing over said imaging aperture, said platen including a light receiving side and a fingerprint receiving side, said fingerprint receiving side receiving a fingerprint that produces fingerprint flesh regions and fingerprint valley regions on said fingerprint receiving side, said light receiving side including a plurality of adjacent optical structures that reduce the reflection of non-working image light signals from said light receiving side and pass working image light signals, said working image light signals being reflected at said fingerprint valley regions to produce a light portion of said sensed working image signals and passing through said fingerprint flesh regions to produce a dark portion of said sensed working image signals.