Interference No. 104,649
Page No. I I
12
22
FIG. 7A
Keagy describes the rays passing through the sheet prism surface 12 as follows:
After passing 4hrough the optical surface 12 from the bottom, the rays that
impinge on points of the surface 26 in contact with air in valleys surrounding
fingerprint ridges are totally internally reflected while rays that impinge on points
of the surface 26 in contact with ridges of the fingerprint will not be reflected and
will escape from the plastic of the finger platen 10 and be dissipated.
(Keagy'969, col. 8, lines 35-41, underline emphasis added). Thus, while Keagy Figure 3 and
Figure 7A both depict rays that bounce off the upper surface of the platen such that the rays are
directed towards the bottom of the platen, Keagy states that these rays were "refracted" in Figure
3 and "reflected" in Figure 7A.
F21 Keagy Figure 6 is said to provide a depiction of a ray diagram for a system that does not
employ a sheet prism. Keagy Figure 6 is provided below:
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Last modified: November 3, 2007