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. 31, 2002
Filed:
May. 11, 2001
Akira Kumon, Osaka, JP;
Akira Fukano, Nara, JP;
Yoshitaka Kitaoka, Osaka, JP;
Akira Ryoji, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
An image forming apparatus for use in a printer for computers and the like includes an image forming head ( ) between a developing sleeve ( ) and an opposing electrode. ( ). Control electrodes ( ) are provided around respective openings ( ) of the head ( ), so that the openings ( ) are electrostatically opened and closed by controlling a voltage applied to the respective control electrodes ( ). In order to prevent the openings ( ) of the head ( ) from being clogged with toner ( ), the percentage of the area of the opening ( ) to the sum of the area of the extent of the control electrode ( ) around the opening ( ) and the area of the opening ( ) is set to 8% or more.