Appeal No. 95-3781
Application 07/978,223
24 and is polarized by polarizer or analyzer 26. In Figure 1,
analyzer 26 rotates on a rotation stage. In another
embodiment depicted in Figure 2, the polarizer 50 rotates on a
rotation stage. The polarizer and analyzer are preferably
birefringent polarizing prisms. Cohn also discloses that
three equations representing three analyzer angles are
necessary to determine the properties of the reflecting
surface (Col 1, lines 15-29, Col. 4, lines 29-34). The
examiner stated:
It would have been obvious rotate the
polarizer or analyzer of Korth... to
generate the three different signals
at the three different angles as
taught by Korth. Cohn et al teaches
measuring at a minimum of three angles
(column 4, lines 33-34), which agrees
with Korth, which measures at three
angles. [Examiner's Answer at page
8].
With respect to the recitation in claim 11 that the
photo sensor is an area sensor, the examiner points out that
Cohn teaches that after the reflected light beam passes
through the polarizer 26, it is directed to a CCD camera 30
which senses an area of reflected light (See Col. 7, lines 11-
15).
-9-
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