| 摘要 |
PROBLEM TO BE SOLVED: To provide a development apparatus in which a developer layer is stably formed as a thin layer and with which a stabilized high picture quality image is obtained for a long time period by suppressing deterioration of a two component developer on a developer carrier. SOLUTION: In the development apparatus equipped with a photoreceptor 1, a development sleeve 5 which has a plurality of magnetic poles inside, holds and conveys the two component developer 10 as a magnetic brush, and a developer controlling member 12 which controls layer thickness of the developer which is held and conveyed with the development sleeve 5, an amount of the developer held with a magnetic pole N1 on an opposing part of the developer controlling member 12 on the more upstream side of the development sleeve 5 than the developer controlling member 12 in the developer conveying direction is two times or less of the amount of the developer passing through the developer controlling member 12. Thereby the amount of the developer 10 receiving force from the developer controlling member 12 relative to the total amount of the developer 10 is lowered and the degree of deterioration of the developer is reduced. COPYRIGHT: (C)2006,JPO&NCIPI |
