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:
Sep. 01, 1992
Filed:
Nov. 01, 1991
Irene F Stein, Fort Collins, CO (US);
Steven L Webb, Loveland, CO (US);
David W Boyd, Greeley, CO (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A document to be scanned is corner referenced on a transparent platen, with the document's image facing down. The platen defines an X-Y coordinate system matrix. A moving line of light extends in the X direction and illuminates the document's image, line by line, as the line of light moves in the Y direction. The line of light that is thus reflected from the document is sensed by a linear CCD sensor array having a large number of individual sensor cells arranged in a line that effectively extends in the X direction. Each cell of the CCD array defines an individual pixel (PEL) within the line of light that is reflected from the document. A reflection target is located at a known position relative to the platen's referencing corner, to be scanned prior to scanning the document. Sensing of the target enables (1) the X direction physical position of the CCD sensor array relative to the referencing corner to be accurately determined, and (2) the Y direction physical position of the line of light relative to the the referencing corner to be accurately determined, both parameters being determined prior to scanning of the document.