| 摘要 |
PROBLEM TO BE SOLVED: To provide a one-component developing device having durability by improving the separating performance of toner from a developing sleeve. SOLUTION: The diameter of a rotating sleeve 11 is set to 10 to 30 mmϕ, the magnetic pole of a fixed magnet roller 10 is three-pole constitution consisting of a developing pole N1 arranged near a developing position and two magnetic poles S1 and S2 whose polarity is different from the developing pole N1 , and horizontal magnetic field whose polarity is reverse to two magnetic poles S1 and S2 is formed on the sleeve 11 put between two magnetic poles S1 and S2 . Furthermore, an interpole angle between two magnetic poles S1 and S2 is set within about 120 deg. to 170 deg., and further the blade pole S2 out of two magnetic poles S1 and S2 is deflected by 6 to 15 deg. to an upstream side in a sleeve rotating direction with respect to a layer thickness regulating member 13. |
