Apparatus for reducing ambient light into an optical print...

Details Apparatus for reducing ambient light into an optical print... Apparatus for reducing ambient light into an optical print...

2006-10-10

2006-10-10

Stafira, Michael P. (Department: 2877)

Optics: measuring and testing

Document pattern analysis or verification

Reexamination Certificate

active

07119889

ABSTRACT:
A light shroud reduces or eliminates the effects of ambient light on an optical fingerprint scanner. Because of the geometry of a prism used in the scanner, ambient light from only certain incidence angles can interfere with an image produced by the scanner. The light shroud blocks this ambient light entering the system at angles which allow the light to interfere with the illumination system or camera. In an embodiment, the light shroud can be closed to act as a cover, protecting the platen surface.

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