Patent ID: 7890026
Filing Date: 2011-02-15
Classification: G03G

Abstract:
1. A development apparatus which develops an electrostatic image formed on an image bearing member with a developer comprising: a developing container having a first chamber and a second chamber which communicates with the first chamber and to which a developer to be fed is supplied; a developer bearing member which is rotatably provided in the first chamber and feeds the developer to the image bearing member; a regulation member disposed against the developer bearing member, for regulating a layer thickness of the developer on the developer bearing member; a first conveying member which is rotatably provided in the first chamber and conveys the developer in the first chamber; and a second conveying member which is rotatably provided in the second chamber and conveys the developer in the second chamber to the first chamber, wherein a frame of the developing container having the first chamber and the second chamber is formed so as to satisfy the following relationships: where Wds, Wd Ts is a dynamic torque (kgf·m) of the developer bearing member, T T Rs is a rotation angle speed (rad/s) of the developer bearing member, R R wherein when the first chamber is divided by a perpendicular bisector which bisects a line connecting the most nearest points of the developer bearing member and the first conveying member: