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:
Oct. 31, 1989
Filed:
Aug. 04, 1988
Applicant:
Inventors:
Ned J Seachman, Penfield, NY (US);
Joseph P Taillie, Rochester, NY (US);
Gary A Dir, Fairport, NY (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G02B / ;
U.S. Cl.
CPC ...
3503 / ; 350335 ; 35016212 ;
Abstract
A liquid crystal birefringent MTF filter is permanently positioned between lens and array of an image input scanner to reduce image modulation at frequencies where moire occurs, with a source of electric potential and a control switch for selectively applying the potential and switching the filter to or from a filtering state. In a variation of the first embodiment, a two-stage MTF filter is used. In a second embodiment, a tunable liquid crystal scattering MTF filter is combined with a full width sensor array.