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:
Feb. 16, 2010
Filed:
Jul. 10, 2007
Tsuyoshi Imamura, Sagamihara, JP;
Kyohta Koetsuka, Fujisawa, JP;
Yoshiyuki Takano, Hachioji, JP;
Masayuki Ohsawa, Atsugi, JP;
Hiroya Abe, Yokohama, JP;
Mieko Terashima, Isehara, JP;
Noriyuki Kamiya, Yamato, JP;
Masaki Watanabe, Kawasaki, JP;
Shigeharu Nakamura, Atsugi, JP;
Tsuyoshi Imamura, Sagamihara, JP;
Kyohta Koetsuka, Fujisawa, JP;
Yoshiyuki Takano, Hachioji, JP;
Masayuki Ohsawa, Atsugi, JP;
Hiroya Abe, Yokohama, JP;
Mieko Terashima, Isehara, JP;
Noriyuki Kamiya, Yamato, JP;
Masaki Watanabe, Kawasaki, JP;
Shigeharu Nakamura, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developer holding member includes a magnetic field generating device and a hollow body including the magnetic field generating device thereinside, and attracting a developer to an external surface thereof with magnetic force of the magnetic field generating device. The external surface of the hollow body is randomly provided with a large number of depressions, and a peak intensity of a spectrum within a range of wavelengths not more than 1 mm, which is figured out by performing a frequency analysis using a profile curve in a circumferential direction of the external surface, is not more than 12.