公开(公告)号：US20100183971A1

公开(公告)日：2010-07-22

申请号：US12691063

申请日：2010-01-21

申请人： Hiroyuki Fujikawa ,  Koh Ishigami ,  Kunihiko Nakamura ,  Nozomu Komatsu ,  Yoshinobu Baba ,  Takeshi Yamamoto ,  Manami Haraguchi ,  Kenta Kubo

发明人： Hiroyuki Fujikawa ,  Koh Ishigami ,  Kunihiko Nakamura ,  Nozomu Komatsu ,  Yoshinobu Baba ,  Takeshi Yamamoto ,  Manami Haraguchi ,  Kenta Kubo

IPC分类号： G03G9/113 ,  G03G9/107 ,  G03G9/08 ,  G03G13/20

CPC分类号： G03G9/107 ,  G03G9/0819 ,  G03G9/0827 ,  G03G9/1131 ,  G03G9/1136

摘要： A magnetic carrier having magnetic carrier particles each containing at least a magnetic core particle and a resin; the magnetic carrier having a resistivity of from 1.0×106 Ω·cm or more to 1.0×1010 Ω·cm or less at an electric-field intensity of 1.0×103 V/cm as found by measuring dynamic impedance; electric-field intensity E(109) at which the resistivity of the magnetic carrier comes to 1.0×109 Ω·cm being 2.0×104 V/cm or less, and electric-field intensity E(108) at which the resistivity of the magnetic carrier comes to 1.0×108 Ω·cm being from 5.0×103 V/cm or more to 2.8×104 V/cm or less; and the electric-field intensity E(108) and the electric-field intensity E(109) being in a ratio, E(108)/E(109), of from 1.0 or more to 5.0 or less.

摘要翻译： 具有磁性载体颗粒的磁性载体，每个磁性载体颗粒至少含有磁芯颗粒和树脂; 磁性载体的电场强度为1.0×10 3 V / cm，电阻率为1.0×10 6Ω·cm·cm〜1.0×10 10Ω·cm·cm以下，通过测定动态阻抗; 磁性载体的电阻率为1.0×109Ω·cm·cm的电场强度E（109）为2.0×10 4 V / cm以下，电场强度E（108）为 磁载体为5.0×10 3 V / cm以上至2.8×10 4 V / cm以下的1.0×10 8Ω·cm·cm。 电场强度E（108）和电场强度E（109）的比例为E（108）/ E（109），为1.0以上且5.0以下。

公开(公告)号：US07715744B2

公开(公告)日：2010-05-11

申请号：US12104032

申请日：2008-04-16

申请人： Tomoaki Miyazawa ,  Takeshi Yamamoto ,  Manami Haraguchi ,  Kenta Kubo ,  Juun Horie

发明人： Tomoaki Miyazawa ,  Takeshi Yamamoto ,  Manami Haraguchi ,  Kenta Kubo ,  Juun Horie

IPC分类号： G03G15/00 ,  G03G15/09

CPC分类号： G03G15/0907 ,  G03G2215/0607

摘要： An image forming apparatus includes a photosensitive drum to which an electrostatic image is formed and a developing sleeve carrying a developer including toner carrier. An alternating voltage is applied to the sleeve to form an alternating electric field between the sleeve and the drum to develop the electrostatic image with the developer. A relation |K1|

摘要翻译： 图像形成装置包括形成有静电图像的感光鼓和承载包含调色剂载体的显影剂的显影套筒。 交替电压施加到套筒上以在套筒和鼓之间形成交变电场，以与显影剂一起显影静电图像。 关系| K1 | <| K2 | 满足，其中K1：电场强度Ed = |（Vp2-VL）/ D |，K2：电场强度Eb = |（Vp1-VL）/ D |的斜率/ D |，VL：电位 Vp1：提供向硒鼓移动调色剂的电位差的峰值电位[V]，Vp2：提供电位差的峰值电位[V] 将墨粉朝袖子移动，D：鼓和袖子之间的最近距离[m]。

公开(公告)号：US20080187338A1

公开(公告)日：2008-08-07

申请号：US12022575

申请日：2008-01-30

申请人： Takeshi Yamamoto ,  Manami Haraguchi ,  Kenta Kubo ,  Yoshinobu Baba ,  Koh Ishigami

发明人： Takeshi Yamamoto ,  Manami Haraguchi ,  Kenta Kubo ,  Yoshinobu Baba ,  Koh Ishigami

IPC分类号： G03G15/06

CPC分类号： G03G15/065 ,  G03G5/04 ,  G03G15/0806 ,  G03G15/5037 ,  G03G15/5062 ,  G03G2215/00037 ,  G03G2215/0607

摘要： An image forming apparatus, wherein the following formulae are satisfied: 0.22 ≤ ( M / S ) L ≤ 0.4 ,  ( Q M ) L = Vc ( Lt 2  ɛ 0  ɛ t + Ld ɛ 0  ɛ d ) × ( M S ) L ( Dt   max - Dt 0.1 ) { λ × ( M S ) L - 0.1 }  ( Lt 2  ɛ 0  ɛ t + Ld ɛ 0  ɛ d ) × ( M S ) L 500 ≤ αβ ≤ ( Dt   max - Dt 0.1 ) { λ × ( M S ) L - 0.1 }  ( Lt 2  ɛ 0  ɛ t + Ld ɛ 0  ɛ d ) × ( M S ) L 150 αβ ≥ ( Dt   max - Dt 0.1 ) { λ × ( M S ) L - 0.1 } 150 where (M/S)L: a toner bearing amount in a maximum density image portion of a photosensitive drum, (Q/M)L: an average charge amount of the toner in the maximum density portion, Vc: an absolute value of a potential difference between a DC-component of a developing bias and the maximum density portion, Lt: a toner layer thickness of the maximum density portion, Ld: a drum thickness, εt: a relative permittivity of the toner layer, εd: a relative permittivity of the drum, ε0: a vacuum permittivity, Dtmax: a transmission density in a maximum density image portion on the paper after fixation, Dt0.1: a transmission density in an image on the paper when the toner bearing amount on the paper after fixation is 0.1 mg/cm2, and λ: a transfer efficiency of the toner, α = ( Dt   max - Dt 0.1 ) { λ × ( M S ) L - 0.1 } ,  and   β = 1 / ( Q / M ) L .