System for print imaging with prism illumination optics

Details System for print imaging with prism illumination optics System for print imaging with prism illumination optics

2005-08-01

2008-09-16

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Document pattern analysis or verification

C356S446000

Reexamination Certificate

active

07426020

ABSTRACT:
A directionally-oriented reflective device is optically coupled to a prism surface in a skin ridge pattern imaging system to reflect illumination light at relatively small angles, along an optical path to an imaging device, so that minimal light is lost from the optical system. Examples of such directionally-oriented reflective devices include, but are not limited to, echelon reflectors, faceted reflective surfaces, retroreflectors, aluminum paint, nacreous pigment, and slightly rough mirror surfaces.

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