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. 10, 2010
Filed:
May. 09, 2008
Kazunari Hagiwara, Numazu, JP;
Katsuhiro Sakaizawa, Numazu, JP;
Norio Takahashi, Suntou-gun, JP;
Rie Endo, Ashigarakami-gun, JP;
Kazunari Hagiwara, Numazu, JP;
Katsuhiro Sakaizawa, Numazu, JP;
Norio Takahashi, Suntou-gun, JP;
Rie Endo, Ashigarakami-gun, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus in which a toner has a volume-average particle diameter R that is in a range of 4.0 μm≦R≦6.2 μm, a developing roller has an arithmetic mean roughness Ra (μm) that is not more than 0.10 times the volume-average particle diameter R of the toner, a voltage applied to a supply roller is of negative polarity, that is, a normal charging polarity of the toner, triboelectrification polarity of the supply roller with respect to the toner is negative, that is, of the normal charging polarity of the toner, and an abutment width S in which the developing roller and the supply roller abut each other is in a range of 2.5 mm≦S≦5.5 mm.