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:
Dec. 14, 1982
Filed:
Sep. 29, 1980
Applicant:
Inventors:
Assignee:
Fuji Xerox Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
346 75 ; 3461 / ;
Abstract
An ink droplet charging device and method in which ink droplets are alternately charged positive, negative and with zero charges to prevent the accumulation of foreign particles upon charging electrodes. A nozzle jets an ink stream which is divided into ink droplets. A charging electrode disposed at the position where the ink stream divides into the droplets controls the charge condition of the ink droplets according to whether the ink droplets are utilized for printing or not. Positive, negative and ground level voltages are applied to the charging electrode in synchronization with the formation of the ink droplets.