Patent ID: 7920812
Filing Date: 2011-04-05
Classification: G03G

Abstract:
1. A development device, which comprises a toner bearing member that causes a toner borne on its surface to hop, and which transports the toner that is hopping on the surface of the toner bearing member to a development area opposite a latent image bearing member of an image forming apparatus along with the surface movement of the toner bearing member, and develops a latent image on the latent image bearing member by causing the hopping toner to adhere to the latent image in the development area, the toner bearing member comprising: a first electrode layer and a second electrode layer laminated so as to overlap one another in a normal direction with respect to the surface of the toner bearing member; and a plurality of openings which are provided in, of these electrode layers, the second electrode layer existing in the upper location that is closer to the surface of the toner bearing member and which are independently arranged in a matrix in both the direction of surface movement of the toner bearing member and an orthogonal-to-movement direction which is the direction orthogonal to the surface movement direction, these openings being provided over an entire latent image bearable area of the latent image bearing member in the orthogonal-to-movement direction, wherein the toner on the surface of the toner bearing member is caused to hop between a plurality of spots directly beneath the openings that respectively exist directly beneath the plurality of openings in the second electrode layer, and a plurality of spots between the openings that respectively exist between the plurality of openings in the second electrode layer, within an entire area of the first electrode layer in the surface direction of the toner bearing member.