Optical apparatus for fingerprint recognition system

Details Optical apparatus for fingerprint recognition system Optical apparatus for fingerprint recognition system

1991-05-22

1993-02-23

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

382 4, G06K 920

Patent

active

051894823

ABSTRACT:
An optical apparatus for a fingerprint recognition system utilizes a light source for emitting a spherical beam. A collimating hologram produces a plane beam upon receiving the emitted spherical beam from the light source. A diffuser generates a scattered beam by scattering the plane beam. A prism absorbs the light at ridges of a subject fingerprint and reflects the light at valleys of the subject fingerprint. An image producing hologram then processes the reflected spherical beam from the prism corresponding to the valleys and condenses the spherical beam upon an area CCD. The area CCD converts the produced fingerprint image into an electric signal. The fingerprint image producing hologram and a cutoff/absorption plate for cutting off and absorbing the beam are, respectively, mounted on a vertical surface of the prism.

REFERENCES:
patent: 4728186 (1988-03-01), Eguchi et al.
patent: 4924085 (1990-05-01), Kato et al.

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