Mita Industrial Co., Ltd.

Yasuhiro Koshijima, Deceased

Masahiko Maeda

Osamu Takemura

A developing device which includes a housing including an opening toward a photosensitive drum, the housing containing a single-component toner, a developing roller disposed in the opening facing the photosensitive drum so as to transfer the toner to an image-forming area between the developing roller and the photosensitive drum, a porous plate disposed in the opening and kept in contact with the part of the developing roller which is positioned in the housing, the porous plate having pores of such a size so as to allow the toner to pass through, and a toner supply means for supplying the toner from the housing to the porous plate.

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Itami, Japan

Yasuhiro Koshijima, Deceased