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. 22, 1987
Filed:
Apr. 21, 1986
Marco Padalino, Dallas County, TX (US);
Ricoh Co., Ltd., Tokyo, JP;
Ricoh Systems, Inc., San Jose, CA (US);
Abstract
An inkjet printing system has a drop generator with a nozzle fed by a pressurized ink source to cause a continuous stream of ink to break into synchronized droplets. A pair of electrodes positioned on either side of the path followed by the droplets are controlled in a time multiplex mode to charge the droplets, and then to deflect the charged droplets. The electronics of this invention provide electronic synchronization and compensation whereby synchronization is achieved between the drop generator stimulation source and the charge/deflect circuit so that during each cycle, a small period of time is allocated for charging and the remaining larger period of time for deflection; and the compensation system provides for the fact that each charged droplet is to be exposed to an equal accumulated deflection energy during its movement between the plates. A gutter collects and recirculate unwanted drops back through the ink system, and provide a drop charge feedback control signal to the synchronization and compensation circuit. In addition to the charge/deflect assembly electrodes which are used in a time multiplex mode for charging and deflecting the droplets, a pair of electrodes common to all jet streams are provided for generating a constant deflection field perpendicular to the time-multiplexed deflection field and parallel to the direction of motion of the recording medium, so that a complete pixel of the overall field to be printed may be covered by the two-dimensional deflection of the droplets issuing from a single orifice.