Patent ID: 9098011
Filing Date: 2015-08-04
Classification: G03G

Abstract:
1. A development device comprising: a developer bearing member that is disposed opposite an image bearing member bearing an electrostatic latent image, and conveys a developer having toner and a carrier to a development region; a first bias applying portion that applies a first DC voltage to the developer bearing member; an electrode member that is disposed on an upstream side of the development region in a developer conveying direction; a second bias applying portion that applies a second DC voltage to the electrode member; and a controller that controls the first bias applying portion and the second bias applying portion such that a first electric field intensity formed between the electrode member and the developer bearing member by a potential difference between the second DC voltage and the first DC voltage is larger than a second electric field intensity formed between the image bearing member and the developer bearing member by a potential difference between a potential at an image portion of the image bearing member and the first DC voltage, wherein the first electric field intensity between the electrode member and the developer bearing member is smaller than a discharge starting voltage between the electrode member and the developer bearing member.