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:
Aug. 12, 2008
Filed:
Apr. 25, 2006
Akinobu Okuda, Osaka, JP;
Kazumasa Hayashi, Hyogo, JP;
Akinori Toyoda, Osaka, JP;
Masao Ootsuka, Osaka, JP;
Hideki Yasuda, Osaka, JP;
Naoki Takahashi, Kyoto, JP;
Akinobu Okuda, Osaka, JP;
Kazumasa Hayashi, Hyogo, JP;
Akinori Toyoda, Osaka, JP;
Masao Ootsuka, Osaka, JP;
Hideki Yasuda, Osaka, JP;
Naoki Takahashi, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a developing apparatus that can effectively prevent generation of a ghost due to poor detachment of a developer after development, and generation of unevenness in density between a left part and a right part of an image region due to lack of an amount of the developer transported. The developing apparatus satisfies the relationshipwhere r denotes a rotational radius of a second developer transporting screw, R denotes a rotational radius of a development roller, and d denotes a center distance between the second developer transporting screw and the development roller. The developing apparatus also satisfies the relationship0≧(0×)/0.02where mg0 (g/mm) denotes an amount of a toner per unit area that is supplied from the development roller to an electrostatic latent image having 100% image coverage which is formed on a photosensitive drum, v (mm/s) denotes a rotational peripheral velocity of the photosensitive drum, l (mm) denotes a maximum printing width on the photosensitive drum, and M0 (g/s) denotes an amount of the developer transported per unit time by the second developer transporting screw in a second developer transport direction.