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. 08, 1998
Filed:
Nov. 29, 1994
Takeshi Kondo, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
An image forming apparatus includes a toner supporting roller, an aperture electrode assembly including one or more apertures and associated control electrodes, a controller and a back electrode roller. The toner supporting roller supplies charged toner particles to the underside of the apertures of the aperture electrode assembly. The controller selectively generates a potential difference between each of the control electrodes and the toner supporting roller. A coulomb force generated by the potential difference attracts the toner particles towards the apertures of the aperture electrode assembly. When no voltage is applied to the control electrodes in generating a blank line, no voltage or a reverse voltage is fed to the back electrode roller. Thus, undesired toner particles are not inadvertently transferred to a printing paper, such that blank image areas spattered with unintentionally transferred toner particles are minimized.