Economical skin-pattern-acquisition and analysis apparatus for access control, systems controlled thereby

摘要

Surface relief of a finger is read using an optical-fiber prism unit, with fiber terminations at one end to contact the surface, and at the other for light passages along fibers from the first. Light enters where NA<0.5 and fiber diameter is constant with longitudinal position. The device is in a 1.4-2 L case, with a battery or power unit, converter to form a corresponding data array for verifying, digital signal processor to do the verifying, and output to indicate or implement a decision. The optical fiber prism unit has a substantially circular cylindrical wall defining a longitudinal axis, fused optical fibers parallel to the longitudinal axis, a traverser face for output of a skin pattern image from the prism and a generally elliptical angled face for contacting such a skin pattern.