Interference No. 104,649
Page No. 15
F26. Chen Figure 7B is said to show how the embodiment of Chen Figure 7A works.
Generally, Chen states that a light ray is passed through the platen whereupon it is subjected to
"total internal light reflection" in the spaces between the ridges that form a fingerprint. In
contrast, where the light ray contacts the sweat on a finger ridge, the light ray is "refracted" and
no light returns to form an image. (ZX 2008, col. 4, lines 42-53).
B. Sibbald, U.S. Patent No. 5,619,586
F27. Sibbald 's describes an apparatus and techniques for the characterization of fingerprints.
(ZX 2012, col, 1, lines 12-13). Specifically, it is an object of Sibbald's invention to provide a
method of producing an image of a fingerprint that may be viewed without the aid of optical
equipment. (ZX 2012, col. 2, lines 1-8).
F28. Sibbald does not describe using reflected light from a plurality of exit surfaces, e.g.,
prisms, to create an image of the fingerprint. Instead, Sibbald depicts and describes a fingerprint
apparatus employing a direct imaging producing means, such as a ground glass plate or a very
thin layer of non-opaque paint. (ZX 2012, Figures 2, 3 and 5, abstract and col. 2, lines 44-47).
Page: Previous 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next
Last modified: November 3, 2007