Title:
【発明の名称】現像装置
Document Type and Number:
Japanese Patent JP3384914
Kind Code:
B2
Abstract:
In an image forming apparatus, a developing device has a developing sleeve accommodating a magnet roller therein, and a doctor for regulating the amount of developer to be conveyed to a developing position. When the developing sleeve is rotated, the part of the doctor shaved off by the doctor from the sleeve is moved in a developer storing section to a toner replenishing opening formed in a toner storing section. Then, this part of the developer is returned to the doctor along the surface of the sleeve via the toner replenishing opening. The developer consists of a first developer containing a first carrier and deposited in a layer on the surface of the sleeve, and a second developer containing a second carrier different from the first carrier and stored in the developer storing section in such a manner as to contact the first developer deposited on the sleeve. The first carrier has a higher charging ability than the second carrier. The device does not need a toner replenishing mechanism or a toner concentration sensor and has, therefore, a miniature and inexpensive construction. In addition, the device is applicable even to a high-speed image forming apparatus.
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Inventors:
Fumihiro Sasaki
Ken Mochizuki
Hidefumi Gohara
Megumi Sakakura
Seiji Oka
Hajime Koyama
Kiyonori Tsuda
Yasushi Akiba
Ken Mochizuki
Hidefumi Gohara
Megumi Sakakura
Seiji Oka
Hajime Koyama
Kiyonori Tsuda
Yasushi Akiba
Application Number:
JP20145495A
Publication Date:
March 10, 2003
Filing Date:
July 14, 1995
Export Citation:
Assignee:
株式会社リコー
International Classes:
G03G21/16; G03G9/08; G03G13/09; G03G15/08; G03G15/09; (IPC1-7): G03G15/08
Domestic Patent References:
| JP6459270A |
Attorney, Agent or Firm:
Hisashi Kuroda