Patent ID: 6823164
Filing Date: 2004-11-23
Classification: G03G

Abstract:
A non-magnetic mono-component developing device, comprising:a developing roller for supplying non-magnetic mono-component toner layered on the peripheral surface thereof to the photoreceptor surface as it being rotated; and a doctor blade which is cantilevered at its proximal end, has a distal end as a free end, extended to the upstream side with respect to the direction of rotation of the developing roller and can regulate the thickness of the toner layer by abutting part of the side flat surface of the distal end portion against the peripheral surface of the developing roller, characterized in that the doctor blade has, at its distal end, an extension projected in the tangent direction from the abutment S and a bent portion (bent angle &thgr;) angled so as to be positioned away from the peripheral surface, and Z is specified so as to satisfy the following relation: 0&lE;[(Rr+4Ã—&phgr;t)2âˆ’Rr2]1/2, â€ƒwhere Z represents the length of the extension from the abutment point S to the bent portion, Rr the radius of the developing roller, and &phgr;t the mean particle size of the toner.