| 摘要 |
PROBLEM TO BE SOLVED: To divide developer for two developer holding bodies, and stably hold and convey the resulting developer from the division toward respective development areas without giving excessive stress to the developer.SOLUTION: A developing device includes: a first developer holding body 2 that is arranged at a position opposite to an image holding body 1 and rotates in a direction opposite to a direction of rotation of the image holding body 1; a second developer holding body 3 that is arranged at a position opposite to the first developer holding body 2 and rotates in the same direction as the direction of rotation of the first developer holding body 2; a developer supply mechanism 4 that supplies developer G to either one of the first and second developer holding bodies 2 and 3; a developer division unit 6 that has division magnetic poles 7 (7a and 7b) having different polarities from each other arranged at opposing positions of the first and second developer holding bodies 2 and 3, and divides the developer G for the two developer holding bodies 2 and 3 in division magnetic fields formed by the division magnetic poles; and a developer conveying unit 9 that has conveyance magnetic poles 10 (10a and 10b) arranged respectively between development magnetic poles 8 (8a and 8b) and the respective division magnetic poles 7 of the first and second developer holding bodies 2 and 3, the conveyance magnetic poles 10 having polarity different from that of the magnetic poles 8 and 7, and holds and conveys the developer G after the division. |
