| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize development property as well as to stably maintain a developer transport rate over a long period of time by regulating the thickness of a developer layer after development on a developer carrier on which a two-component developer is carried and transported. <P>SOLUTION: A development device is composed of: a developer carrier 2 having a rotatable development sleeve 3 capable of carrying a developer on a surface thereof and a magnet body 4 having a plurality of fixedly arranged magnetic poles including at least adjacent repelling magnetic poles m1, m2 of the same polarity within the development sleeve 3; a pre-development layer thickness regulating member 5 disposed apart from the developer carrier 2 on an upstream side of a development area in a developer transport direction of the developer carrier 2 and on a downstream side of a developer detachment portion from the developer carrier 2 by the repelling magnetic poles m1, m2 to regulate the thickness of a developer layer on the developer carrier 2 before development; and a post-development layer thickness regulating member 6 for regulating the thickness of a developer layer on the developer carrier 2 after development within a thickness smaller than the thickness of the developer layer regulated by the pre-development layer thickness regulating member 5 on a downstream side of the development area and on an upstream side of the detachment portion. <P>COPYRIGHT: (C)2008,JPO&INPIT |
