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1. (WO2017155125) DEVELOPING DEVICE

Pub. No.:    WO/2017/155125    International Application No.:    PCT/JP2017/010289
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Mar 09 00:59:59 CET 2017
IPC: G03G 15/09
G03G 15/08
Applicants: CANON KABUSHIKI KAISHA
キヤノン株式会社
Inventors: SAKAMAKI, Tomoyuki
坂巻 智幸
OKUYAMA, Yuta
奥山 雄太
Title: DEVELOPING DEVICE
Abstract:
A developing device comprising: a rotatable developing sleeve that carries a developer including a toner and a magnetic carrier and develops an electrostatic latent image formed on an image carrier in a developing area where the developer comes in contact with the image carrier; and a magnetic field generation unit that is provided inside the developing sleeve and includes a development magnetic pole located facing the image carrier to create the developing area. The ratio of the 80% width of a magnetic flux density of the development magnetic pole along the direction normal to the developing sleeve relative to the half width of the magnetic flux density along a direction normal to the development magnetic pole is 0.65 or greater, and the magnetic force of the development magnetic pole along the direction normal to each developing sleeve near both ends of the developing area along the rotational direction of the developing sleeve is greater than the magnetic force at the center of the developing area.