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:
Jun. 30, 1981
Filed:
Aug. 13, 1979
Millard A Habegger, Boulder, CO (US);
Ross B Hooker, III, Boulder, CO (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system is disclosed in which a light beam from a light source is scanned over the surface of a document to be copied which is located at a nominal document position within the system. Light from the light beam is retro-scattered by the document, collected by a lens system and focused upon a detector. The intensity of the light impinging upon the detector is indicative of information contained upon the portion of the surface of the document being scanned. The system further includes aperture stops for limiting the solid angle of collection of retro-scattered light from a first position beyond the nominal document position from the lens system to a first predetermined angular value and for limiting the solid angle of collection of retro-scattered light from a second position between the nominal document position and the lens system to a second predetermined angular value.