Patent ID: 7415230
Filing Date: 2008-08-19
Classification: G03G

Abstract:
1. A developing apparatus, comprising: a developer carrying member, disposed opposite to an image bearing member, for carrying developer which is caused to jump from said developer carrying member to said image bearing member to develop an electrostatic latent image formed on said image bearing member by creating an oscillation electric field between said image bearing member and said developer carrying member at an opposing portion where said image bearing member and said developer carrying member are opposed to each other; and a jumping developer regulation member for regulating an area in which the developer is caused to jump in the opposing portion, said jumping developer regulation member being extended from an upstream side of the opposing portion into a developing zone in a movement direction of said image bearing member, wherein said jumping developer regulation member is disposed apart from the developer carried by said developer carrying member and has an electrically insulated member, wherein said jumping developer regulation member is disposed in contact with a surface of said image bearing member under pressure, wherein said jumping developer regulation member is provided with an electrically insulated electroconductive member during development, and wherein when a developing zone between said image bearing member and said developer carrying member has a length L and a length from a position of an upstream end portion of said developing zone in a movement direction of said image bearing member to a position of a free end of said jumping developer regulation member is N, the lengths L and N satisfying the following relationship: