Mita Industrial Co., Ltd.

Tomiyasu Matsuda

Teruaki Higashiguchi

Mamoru Kato

Masanori Matsuda

Takeshi Hori

Atsuhiko Irie

The method of feeding a developer according to the present invention is characterized by controlling the quantity of the developer fed to a developing zone, by the use of a member having on its surface an electret dielectric layer, which is used as an ear cutter. According to the present invention, the quantity of the developer being carried is controlled by the action of an electrostatic force exerted from the electret dielectric layer. Hence it becomes possible to effectively eliminate the density unevenness, charge unevenness of the developer and to obtain a stable image.

Method of feeding developer to developing zone in electrophotography

An optimum image can be obtained by carrying out the development while using a two-component type developer comprising an electroscopic toner and a magnetic carrier and maintaining the peripheral speed ratio of the magnet sleeve to the photosensitive material drum within a certain range according to the average particle size and saturation magnetization of the magnetic carrier and the dynamic friction coefficient of the magnetic brush.

Growing community of inventors

Yokosuka, Japan

Tomiyasu Matsuda