发明名称 |
Development device, process cartridge, and image forming apparatus incorporating same |
摘要 |
A development device includes a developer container for containing developer, a developer bearer to carry by rotation the developer contained in the developer container to a development range facing a latent image bearer, a partition dividing the developer container into an upper compartment and a lower compartment arranged vertically, an upper developer conveyance member disposed in the upper compartment, a lower developer conveyance member disposed in the lower compartment, a communication portion through which the developer moves from the lower compartment to the upper compartment, disposed in a downstream end portion of the lower compartment in a direction in which the lower developer conveyance member transports the developer, and a toner concentration detector to detect a concentration of toner in the developer beneath the communication portion inside the lower compartment. |
申请公布号 |
US8873979(B2) |
申请公布日期 |
2014.10.28 |
申请号 |
US201213355020 |
申请日期 |
2012.01.20 |
申请人 |
Ricoh Company, Ltd. |
发明人 |
Fujiwara Yoshihiro;Ohyama Kunihiro;Yamane Masayuki;Kimura Hideki;Takahashi Masaki;Hayashi Toshiki |
分类号 |
G03G15/08 |
主分类号 |
G03G15/08 |
代理机构 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. A development device comprising:
a developer container for containing two-component developer; a developer bearer to carry by rotation the developer contained in the developer container to a development range facing a latent image bearer; a partition dividing at least partly the developer container into an upper compartment and a lower compartment arranged vertically; an upper developer conveyance member disposed in the upper compartment to transport the developer inside the upper compartment; a lower developer conveyance member disposed in the lower compartment to transport the developer inside the lower compartment; a communication portion through which the developer moves from the lower compartment to the upper compartment, the communication portion disposed in a downstream end portion of the lower compartment in a direction in which the lower developer conveyance member transports the developer; and a toner concentration detector to detect a concentration of toner in the developer beneath the communication portion inside the lower compartment, the toner concentration detector being positioned directly beneath the communication portion with respect to a vertical direction and a longitudinal direction, and the toner concentration detector being positioned beneath the lower developer conveyance member. |
地址 |
Tokyo JP |