Optics: measuring and testing – Document pattern analysis or verification
Reexamination Certificate
2008-07-22
2009-12-15
Punnoose, Roy (Department: 2886)
Optics: measuring and testing
Document pattern analysis or verification
C235S454000
Reexamination Certificate
active
07633605
ABSTRACT:
A prism sensor is provided for detecting presence or absence of a document in a document transport path. The prism sensor comprises a light emitter disposed on a first side of the document transport path and for emitting light across the document transport path to a second side of the document transport path, a reflector including (i) a first reflecting surface for receiving light from the light emitter and for providing first reflected light in response thereto, (ii) a second reflecting surface for receiving the first reflected light from the first reflecting surface and for providing second reflected light in response thereto, and (iii) a third reflecting surface for receiving the second reflected light from the second reflecting surface and for providing third reflected light in response thereto, and a light receiver for receiving the third reflected light from the third reflecting surface and for providing a signal which is indicative of presence or absence of a document in the document transport path.
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Chan Michael
NCR Corporation
Punnoose Roy
LandOfFree
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