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:
Jul. 14, 1992
Filed:
Sep. 28, 1990
Applicant:
Inventor:
Randall C Ryon, Fairport, NY (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; G06K / ;
U.S. Cl.
CPC ...
2502081 ; 2502 / ; 358406 ;
Abstract
A document image scanner is provided in which a platen is provided with an optical target in the form of a succession of ruling lines provided at one edge thereof. The ruling lines are inclined at an angle relative to a direction of scan of an optical sensor array such that 5% or less coverage change is provided over each pixel on a scanning line of the array. An output signal from scanning each line can be produced as a square wave signal. From the generated signal, the scanning motion may be corrected. A diagnostic tool is also provided for diagnosing scanning motion using at least two of the optical targets.