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:
Jan. 14, 2003
Filed:
May. 14, 2001
Takehiko Okamura, Nagano-ken, JP;
Hidenori Kin, Nagano-ken, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A developing device according to the present invention comprises an image developing roll having a roll surface treated with sand blast treatment to form a rough surface morphology in which aluminum anodizing is also applied to the surface of the image developing roll where the rough surface morphology is formed. To the image developing roll is applied a development bias consisting of a direct current voltage overlapped with an alternate current voltage. In this arrangement, the image developing roll can perform the functions of conveying developer, charging developer, and preventing of discharge of the developing bias, while the image developing roll can be manufactured from a metallic roll such as aluminum roll at a low cost. Moreover, a gradual scraping of the image developing roll surface by external additives of toner suppresses adhering of toner onto the surface of the image developing roll , preventing the occurrence of filming.