Optics: measuring and testing – Position or displacement
Reexamination Certificate
2011-01-04
2011-01-04
Pham, Hoa Q (Department: 2886)
Optics: measuring and testing
Position or displacement
C356S622000, C345S175000, C345S174000
Reexamination Certificate
active
07864341
ABSTRACT:
A coordinate detection apparatus has a light projecting unit and light receiving unit, detects abnormal light based on the output from the light receiving unit in a state in which the light projecting unit does not project any light, and detects the coordinates of a light-shielded position based on the output from the light receiving unit in a state in which the light projecting unit projects light.
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Canon Kabushiki Kaisha
Cowan Liebowitz & Latman P.C.
Pham Hoa Q
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