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:
Oct. 06, 2009
Filed:
Oct. 30, 2006
Shunji Katoh, Sagamihara, JP;
Katsumi Masuda, Yokohama, JP;
Hideo Yoshizawa, Sagamihara, JP;
Yoshio Hattori, Kawasaki, JP;
Hideki Kimura, Yokohama, JP;
Kiyotaka Sakai, Kawasaki, JP;
Kenji Nakajima, Sagamihara, JP;
Keiichi Yoshida, Kawasaki, JP;
Akira Azami, Yokohama, JP;
Yuji Suzuki, Ota-ku, JP;
Shunji Katoh, Sagamihara, JP;
Katsumi Masuda, Yokohama, JP;
Hideo Yoshizawa, Sagamihara, JP;
Yoshio Hattori, Kawasaki, JP;
Hideki Kimura, Yokohama, JP;
Kiyotaka Sakai, Kawasaki, JP;
Kenji Nakajima, Sagamihara, JP;
Keiichi Yoshida, Kawasaki, JP;
Akira Azami, Yokohama, JP;
Yuji Suzuki, Ota-ku, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A developer bearing member on which grooves slanting in a thrust direction of the developer bearing member cross other grooves reversely slanting relative to the thrust direction, wherein each of the grooves and the reversely slanting grooves is slanting at an angle of greater than 0° and not greater than 40°. Any two adjacent intersections of the grooves and the reversely slanting grooves in the thrust (or peripheral) direction are preferably on different levels in the peripheral (or thrust) direction. The distance between two adjacent intersections in the thrust direction is preferably from 1.3 mm to 4.8 mm. The distance between two adjacent intersections in the thrust direction is preferably from 0.38 Vd/Vi (mm) to 1.1 Vd/Vi (mm). The deviation in depth of grooves present on a 36° arc surface portion of the member is not greater than 15% of the gap between the image bearing member and the developer bearing member.