Samsung Electronics Co., Ltd.

Naonori Kurogawa

Kyu-cheol Shin

Myung-kook Ahn

Masahiko Itaya

Tsutomu Sasaki

Tsutomu Teraoka

A powder conveying device and an image forming apparatus having the same are disclosed. The powder conveying device to convey powder such as toner, includes a conveying plate to carry powder thereon, a vibration generating device to vibrate the conveying plate, and a plurality of conveying protrusions provided on a surface of the conveying plate to convey the powder loaded on the conveying plate. Each of the conveying protrusions has an incline of an upstream side and an incline of a downstream side on a powder conveying path. The incline of the upstream side is smaller than the incline of the downstream side. The powder conveying device can realized with smaller size and/or with lower cost.

Powder conveying device and image forming apparatus having the same

An electrophotographic image forming device is provided which includes an image holder on which an electrostatic latent image is formed. A magnetic roller has a magnetic brush including nonmagnetic toner and a magnetic carrier using a magnetic force. Donor rollers are provided which have toner layers that are received from the magnetic roller on an outer circumference of each of the donor rollers. The donor rollers are located opposite to the image holder to develop the toner onto the electrostatic latent image.

Electrophotolithographic image forming device and image developing method

A hybrid type developing apparatus and method forms a magnetic brush of non-magnetic toner and a magnetic carrier on a circumference of a magnetic roller forms a uniform toner layer on the circumference of a donor roller using only toner from the magnetic roller, and develops an electrostatic latent image on an image receptor. The hybrid type developing apparatus includes: a plurality of electrodes on the circumference of the donor roller; first and second brush electrodes in an upstream area and a downstream area, respectively, of the donor roller facing the magnetic roller with respect to a direction of rotation; and a bias applying device for applying a recovery bias to the first brush electrode to remove toner from the donor roller and a supply bias to the second brush electrode to supply toner from the magnetic roller to the donor roller.

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Suwon-si, South Korea

Naonori Kurogawa