| 摘要 |
An object of the present invention is to provide a small-sized developing apparatus which well supplies the developer, does not cause the image degradation for a long term. The developing apparatus comprises a developer containing chamber, a developer supply chamber and developing means which is disposed in said developer supply chamber and develops an electrostatic latent image, a boundary wall which is disposed between said developer containing chamber and said developer supply chamber and has a first and a second opening, and an opening and closing member for opening and closing said first opening. The single component developer is supplied through said second opening into the developer supply chamber. The opening and closing member opens and closes, in response to the toner quantity supplied into the toner supply chamber and allows said single component developer to move in only one direction from said developer supply chamber to said developer containing chamber.
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