The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 2009
Filed:
Jul. 22, 2008
Fredrik L. N. Kallin, Waterloo, CA;
Fredrik L. N. Kallin, Waterloo, CA;
NCR Corporation, Dayton, OH (US);
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.