| 摘要 |
A development device capable of suppressing the occurrence of development defects caused by partial damage to an electrode of a toner bearing roller. The development device is provided with a first electrode layer and a second electrode layer, which are laminated so as to overlap one another in a normal direction with respect to the surface of the roller part of the toner bearing roller. A plurality of openings, which are independently arranged in a matrix in both the roller surface movement direction and an orthogonal-to-movement direction which is the direction orthogonal thereto, are provided in, of these electrode layers, the second electrode layer existing in the upper location that is closer to the roller surface, over the entire latent image bearable area of a photosensitive body in the orthogonal-to-movement direction. The toner on the surface of the roller part 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 the entire area of the first electrode layer which is uniformly formed in the roller circumferential direction.
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