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公开(公告)号：EP0693715A3
公开(公告)日：1998-01-14
申请号：EP95111251.5
申请日：1995-07-18
发明人： Kumasaka, Takao , Takuma, Yasuo , Igawa, Tatsuo , Sugaya, Tomio , Kikuchi, Yasuo
IPC分类号： G03G15/09
CPC分类号： G03G15/0921 , G03G2215/017 , G03G2215/018 , G03G2215/0602 , G03G2215/0634
摘要： A developing apparatus in which a stationary multipole permanent magnet (4) is placed in a sleeve (3) and in which a development is performed by bringing a developer (7), which contains at least carrier and toner particles and is held on the periphery of a sleeve (3) by use of the magnetic force of the multipole permanent magnet (4), into contact with a photo-conductive body (1) owing to the rotation of the sleeve (3). For securing of image density and for preventing of the deposition of carrier onto the photo-conductive body (1), two magnetic pieces (18, 19), each of which is arranged lengthwise in the direction of the axis thereof and has same polarity, are placed in a region in the multipole permanent magnet (4), which faces the photo-conductive body (1), in such a manner as to adjoin in the circumferential direction of said permanent magnet (4). This results in generation of the distribution of a magnetic field, which have two peaks of the magnetic force. The position, at which a second one of the two peaks of the magnetic force is formed downstream in the direction of rotation of the sleeve (3), is set at the nearest point between the photo-conductive body (1) and the sleeve (3). Thereby, even when a development is performed by bringing the developer (7) into light contact with the photo-conductive body (1), the image density can be secured. Further, the carrier can be prevented from depositing on the photo-conductive body (1).
摘要翻译： 一种显影装置，其中固定多极永磁体（4）放置在套筒（3）中，其中通过使至少包含载体和调色剂颗粒并保持在周边上的显影剂（7）进行显影 通过使用多极永磁体（4）的磁力，由于套筒（3）的旋转而与光导体（1）接触的套筒（3）。 为了确保图像浓度和防止载体沉积到光导体（1）上，两个磁性片（18,19）在其轴线方向上纵向设置并具有相同的极性， 以与所述永磁体（4）的圆周方向相邻的方式配置在与所述导光体（1）相对的所述多极永磁体（4）的区域中。 这导致产生具有磁力的两个峰值的磁场分布。 将磁力的两个峰的第二个峰在套筒（3）的旋转方向的下游形成的位置设置在光导体（1）和套筒（1）之间的最近点 3）。 因此，即使通过使显影剂（7）与光导体（1）发生光接触来进行显影，也可以确保图像浓度。 此外，可以防止载体沉积在光导体（1）上。
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公开(公告)号：EP0693715A2
公开(公告)日：1996-01-24
申请号：EP95111251.5
申请日：1995-07-18
发明人： Kumasaka, Takao , Takuma, Yasuo , Igawa, Tatsuo , Sugaya, Tomio , Kikuchi, Yasuo
IPC分类号： G03G15/09
CPC分类号： G03G15/0921 , G03G2215/017 , G03G2215/018 , G03G2215/0602 , G03G2215/0634
摘要： A developing apparatus in which a stationary multipole permanent magnet (4) is placed in a sleeve (3) and in which a development is performed by bringing a developer (7), which contains at least carrier and toner particles and is held on the periphery of a sleeve (3) by use of the magnetic force of the multipole permanent magnet (4), into contact with a photo-conductive body (1) owing to the rotation of the sleeve (3). For securing of image density and for preventing of the deposition of carrier onto the photo-conductive body (1), two magnetic pieces (18, 19), each of which is arranged lengthwise in the direction of the axis thereof and has same polarity, are placed in a region in the multipole permanent magnet (4), which faces the photo-conductive body (1), in such a manner as to adjoin in the circumferential direction of said permanent magnet (4). This results in generation of the distribution of a magnetic field, which have two peaks of the magnetic force. The position, at which a second one of the two peaks of the magnetic force is formed downstream in the direction of rotation of the sleeve (3), is set at the nearest point between the photo-conductive body (1) and the sleeve (3). Thereby, even when a development is performed by bringing the developer (7) into light contact with the photo-conductive body (1), the image density can be secured. Further, the carrier can be prevented from depositing on the photo-conductive body (1).
摘要翻译： 一种显影装置，其中静止的多极永磁体（4）被放置在套筒（3）中，并且通过将显影剂（7）进行显影，所述显影剂至少包含载体和调色剂颗粒并被保持在外围 利用多极永磁体（4）的磁力使套筒（3）的套筒（3）与套筒（3）的旋转相接触而与光电导体（1）接触。 为了确保图像密度和防止载体沉积在光电导体（1）上，两个磁性片（18,19）沿轴向纵向排列并具有相同的极性， 被放置在多极永磁体（4）中面向光电导体（1）的区域中，以在所述永磁体（4）的圆周方向上邻接。 这导致产生具有两个磁力峰值的磁场分布。 磁力的两个峰值中的第二个在套筒（3）的旋转方向下游形成的位置被设置在光电导体（1）和套筒（3）之间的最近点处 3）。 由此，即使通过使显影剂（7）与光电导体（1）光接触来进行显影，也可以确保图像浓度。 此外，可以防止载体沉积在光电导体（1）上。
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公开(公告)号：EP0693715B1
公开(公告)日：2003-10-08
申请号：EP95111251.5
申请日：1995-07-18
发明人： Kumasaka, Takao , Takuma, Yasuo , Igawa, Tatsuo , Sugaya, Tomio , Kikuchi, Yasuo
IPC分类号： G03G15/09
CPC分类号： G03G15/0921 , G03G2215/017 , G03G2215/018 , G03G2215/0602 , G03G2215/0634
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