Developing device



<P>PROBLEM TO BE SOLVED: To provide a developing device which dispenses with a toner replenishing mechanism or the like, is made small-sized and inexpensive and sufficiently electrifies the toner of developer even when used in a high speed copying machine. <P>SOLUTION: In the developing device, the developer blocked by a doctor 6 is moved to the side of the toner replenishing opening 8a of a toner hopper 8 by the internal pressure and the gravity of the developer itself in a developer storing part (developer stagnating part) 10, and the developer taken in the toner from the toner hopper 8 is fed to the side of the doctor 6 along the surface of a developing sleeve 4 and the developer on the developing sleeve 4 whose quantity is regulated to a given quantity is supplied to a developing area opposed to a photoreceptor drum 1. In the developing device, magnetic toner is used as the toner constituting the developer. Then, it is desirable to have a space (interstice) in the developer storing part 10 in a state that the toner concentration of the developer reaches upper limit toner concentration. <P>COPYRIGHT: (C)2004,JPO
【課題】 トナー補給機構等を必要としない小型で安価な現像装置であって、高速の複写機に用いた場合でも現像剤のトナーを十分に帯電することができる現像装置を提供する。 【解決手段】 ドクタ6で阻止された現像剤を現像剤収容部(現像剤滞留部)10内で現像剤自身の内圧及び自重によりトナーホッパ8のトナー補給用開口8a側に移動させるとともに、トナーホッパ8からトナーを取り込んだ現像剤を、現像スリーブ4表面に沿ってドクタ6側に搬送し、所定量に規制した現像スリーブ4上の現像剤を感光体ドラム1と対向する現像領域に供給する現像装置において、現像剤を構成するトナーとして磁性トナーを用いる。ここで、上記現像剤のトナー濃度が上限トナー濃度になった状態で、現像剤収容部10内に空間(空隙)を有するのが好ましい。 【選択図】 図1




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