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:
Mar. 09, 1982
Filed:
Aug. 15, 1980
Applicant:
Inventor:
Robert I Keur, Niles, IL (US);
Assignee:
A. B. Dick Company, Chicago, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
346-11 ; 346 75 ;
Abstract
A method and apparatus for ink jet printing are disclosed which employ reverse charge coupling to increase character height. A video signal is utilized to modulate the charge ring voltage. Via a parallel path the ink in the nozzle is reversely charged by the video signal. Thus, as the ink drops are formed their electrical charge is greater than can be obtained under ordinary circumstances. This permits greater deflection of the drops resulting in larger characters on the printing media at the normal distance between media and nozzle or higher quality characters of the same size if the media is moved closer to the nozzle.