Developing roller with an identical polarity magnetic part

A developing device comprising:

• a rotatable developing sleeve;
• a magnet member stationarily disposed inside said developing sleeve;
• and
• a developer restricting member which restricts an amount of developer transported on a peripheral surface of said developing sleeve toward a developing region in accordance with rotation of said developing sleeve, said magnet member having a developing magnetic pole part which is formed of a plurality of adjacent magnetic poles of identical polarity and confronts said developing region, an identical polarity magnetic part which is provided between said developer restricting member and said developing magnetic pole part and is formed of a plurality of adjacent magnetic poles of an identical polarity, said identical polarity magnetic part has the same polarity as the developing magnetic pole part, and a transporting magnetic pole which is provided between said identical polarity magnetic part and said developing magnetic pole part for transporting the developer and has a polarity opposite to that of the identical polarity magnetic part.

A developing device comprising:

• a rotatable developing sleeve;
• a developer restricting member which restricts an amount of developer transported on a peripheral surface of said developing sleeve toward a developing region in accordance with rotation of said developing sleeve;
• a magnet member stationarily disposed inside said developing sleeve, said magnet member having a developing magnetic pole confronting said developing region, an identical polarity magnetic part which is provided between said developer restricting member and said developing magnetic pole and is formed of a plurality of adjacent magnetic poles having identical polarity;
• and a transporting magnetic pole which is provided between said identical polarity magnetic part and said developing magnetic pole for transporting the developer;
• and
• a developer stirring member which is disposed at a location confronting said identical polarity magnetic part, and contacts the developer being transported on an outer peripheral surface of said developing sleeve toward said developing region for stirring the same.

A developing device comprising:

• a rotatable developing sleeve;
• a developer restricting member which restricts an amount of developer transported on a peripheral surface of said developing sleeve toward a developing region in accordance with rotation of said developing sleeve;
• a magnet member stationarily disposed inside said developing sleeve, said magnet member having a developing magnetic pole confronting said developing region, an identical polarity magnetic part which is provided between said developer restricting member and said developing magnetic pole and is formed of a plurality of adjacent magnetic poles having identical polarity, and a transporting magnetic pole which is provided between said identical polarity magnetic part and said developing magnetic pole for transporting the developer;
• and
• a developer stirring member which is disposed at a location confronting said identical polarity magnetic part and is spaced from said developer, and applies a magnetic field to stir the developer being transported on an outer peripheral surface of said developing sleeve toward said developing region.