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. 15, 2017
Filed:
Aug. 09, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Yusuke Ishida, Toride, JP;
Takanori Iida, Noda, JP;
Yasushi Takeuchi, Moriya, JP;
Toshiyuki Yamada, Kashiwa, JP;
Shiro Higashikozono, Tsukuba, JP;
Hiroto Kakinuma, Moriya, JP;
Toshiya Kobayashi, Toride, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A developing device includes a developing container, a developing sleeve, a magnet and grooves provided at a surface of the sleeve and formed along a direction crossing a circumferential direction of the sleeve. In a cross-section, each of the grooves is formed by a flat bottom portion contacting a carrier particle and a pair of side surface portions provided in both sides of the flat bottom portion with respect to the circumferential direction of the sleeve and satisfies the following relationship:22×and2≦<2 In the above, r is a volume-average particle size of the carrier particles, w is a length of the flat bottom portion, L is a width between the side surface portions at the surface of the sleeve, and s is a depth of each of the grooves.