公开(公告)号：US07826781B2

公开(公告)日：2010-11-02

申请号：US12051186

申请日：2008-03-19

申请人： Masashi Fujishima ,  Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Yukihiro Mori

发明人： Masashi Fujishima ,  Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Yukihiro Mori

IPC分类号： G03G15/09

CPC分类号： G03G15/0921 ,  G03G15/0818 ,  G03G2215/0609

摘要： An image forming apparatus has a photoconductive member, and a developing roller develops a latent image on the photoconductive member by a first alternating-current bias in the form of a rectangular wave. The following relationships are satisfied in calculating the duty ratio (D1) of the first alternating-current bias using an application period of voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period: a CV value in the number particle size distribution of the toner is ≦25%, 4 μm≦Dt≦7 μm, 105 Ω·cm≦pv≦109 Ω·cm, 0.4 μm≦Ra≦1.5 μm, and 35%≦D1≦75%. where Dt denotes the volume average particle diameter of the toner, pv denotes the intrinsic resistance value of a developing roller surface, Ra denotes the arithmetic average roughness of the developing roller surface.

摘要翻译： 图像形成装置具有感光体，并且显影辊通过矩形波形式的第一交流偏压在感光体上显影潜像。 在使用调色剂从显影辊朝向感光体转印调色剂的方向的电压施加期间，计算第一交流偏压的占空比（D1）为以下关系：CV值 调色剂的数量粒度分布为25％，4μm＆nlE; Dt＆nlE;7μm，105＆OHgr;·cm＆nlE; pv＆nlE; 109＆OHgr;·cm，0.4μm和nlE; Ra＆nlE;1.5μm和35％ ; 75％。 其中Dt表示调色剂的体积平均粒径，pv表示显影辊表面的固有电阻值，Ra表示显影辊表面的算术平均粗糙度。

公开(公告)号：US20080232859A1

公开(公告)日：2008-09-25

申请号：US12050219

申请日：2008-03-18

申请人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

发明人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

IPC分类号： G03G15/09

CPC分类号： G03G15/0928 ,  G03G15/0907

摘要： An image forming apparatus has a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image on the photoconductive member by a first bias. A magnetic roller forms a magnetic brush thereon with a two-component developer and forms a thin toner layer on the developing roller by a second bias. The developing roller is aluminum with a surface treated for high resistance. The thickness (T) of the toner layer and the duty ratio (D1) of the first alternating-current bias satisfy relationships of the following equations for calculating the duty ratio (D1) using an application period of a voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period: 7 μm≦T≦13 μm, and 35%≦D1≦70%.

摘要翻译： 图像形成装置具有要在其上形成潜像的感光体，用于通过第一偏压在感光体上显影潜像的显影辊。 磁性辊在其上用双组分显影剂形成磁刷，并通过第二偏压在显影辊上形成薄的调色剂层。 显影辊是具有高电阻表面处理的铝。 调色剂层的厚度（T）和第一交流偏置的占空比（D 1）满足以下等式的关系，用于使用电压在施加方向上的施加周期来计算占空比（D 1） 将调色剂从显影辊朝着感光体转移到正周期：<？in-line-formula description =“In-line Formulas”end =“lead”？> 7 mum <= T <= 13 mum， ？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> 35％<= D 1 < = 70％。<？in-line-formula description =“In-line Formulas”end =“tail”？>

公开(公告)号：US07848686B2

公开(公告)日：2010-12-07

申请号：US12127151

申请日：2008-05-27

申请人： Toyotsune Inoue ,  Takahisa Nakaue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Shoichi Sakata ,  Yukihiro Mori

发明人： Toyotsune Inoue ,  Takahisa Nakaue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Shoichi Sakata ,  Yukihiro Mori

IPC分类号： G03G15/09 ,  G03G15/08

CPC分类号： G03G15/095 ,  G03G15/0815

摘要： A developing device uses a two-component developer including at least carriers and toners. The toners are supplied to an image bearing member bearing an electrostatic latent image so that a toner image is developed from the electrostatic latent image. The developing device has a developing roller arranged to oppose the image bearing member; and a magnetic roller arranged to oppose the developing roller. The magnetic roller retains the two-component developer to supply toners to the developing roller. The developing roller and the magnetic roller are rotationally driven in directions to be opposite from one another at an opposed position, and a magnetic pole of the magnetic roller and a magnetic pole of the developing roller have magnetic polarities different from one another at the opposed position. A surface roughness of the magnetic roller is greater than a surface roughness of the developing roller.

摘要翻译： 显影装置使用包括至少载体和调色剂的双组分显影剂。 将调色剂供应到承载静电潜像的图像承载部件，使得调色剂图像从静电潜像显影。 显影装置具有布置成与图像承载部件相对的显影辊; 以及布置成与显影辊相对的磁辊。 磁性辊保持双组分显影剂以将调色剂供应到显影辊。 显影辊和磁性辊在相对位置上被相互旋转的方向旋转驱动，磁性辊的磁极和显影辊的磁极在相对位置处具有彼此不同的磁极性 。 磁辊的表面粗糙度大于显影辊的表面粗糙度。

公开(公告)号：US07742727B2

公开(公告)日：2010-06-22

申请号：US12050219

申请日：2008-03-18

申请人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

发明人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

IPC分类号： G03G15/09

CPC分类号： G03G15/0928 ,  G03G15/0907

摘要： An image forming apparatus has a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image on the photoconductive member by a first bias. A magnetic roller forms a magnetic brush thereon with a two-component developer and forms a thin toner layer on the developing roller by a second bias. The developing roller is aluminum with a surface treated for high resistance. The thickness (T) of the toner layer and the duty ratio (D1) of the first alternating-current bias satisfy relationships of the following equations for calculating the duty ratio (D1) using an application period of a voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period: 7 μm≦T≦13 μm, and 35%≦D1≦70%.

摘要翻译： 图像形成装置具有要在其上形成潜像的感光体，用于通过第一偏压在感光体上显影潜像的显影辊。 磁性辊在其上用双组分显影剂形成磁刷，并通过第二偏压在显影辊上形成薄的调色剂层。 显影辊是具有高电阻表面处理的铝。 调色剂层的厚度（T）和第一交流偏置的占空比（D1）满足用于计算占空比（D1）的以下等式的关系，即使用转印方向上的电压的施加周期 调色剂从显影辊朝向感光体的正周期：7μm＆amp; NlE; T＆nlE;13μm和35％＆amp; D1; D1＆nlE; 70％。

公开(公告)号：US08014690B2

公开(公告)日：2011-09-06

申请号：US12042684

申请日：2008-03-05

申请人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

发明人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

IPC分类号： G03G15/06

CPC分类号： G03G15/065

摘要： A developing unit has a voltage-applicator (80) to apply a developing bias voltage to a developing roller (72). The voltage-applicator (80) applies the developing bias voltage for a first duration to apply an AC voltage having a rectangular waveform, and a second duration to stop applying the AC voltage. The AC voltage has a duty ratio of 50% or more in a direction for causing toner to develop an electrostatic latent image. The number of cycles of the AC voltage in the first duration is two or more, and the AC voltage has a voltage in a direction for pulling the toner back to the developing roller, just before transition to the second duration. The developing unit suppresses occurrence of image unevenness due to a fluctuation in developing gap. Thus, an image forming apparatus equipped with the developing unit forms a high-quality image while suppressing image unevenness.

摘要翻译： 显影单元具有向显影辊（72）施加显影偏压的电压施加器（80）。 电压施加器（80）施加显影偏压第一持续时间以施加具有矩形波形的交流电压和第二持续时间以停止施加AC电压。 AC电压在使调色剂显影静电潜像的方向上具有50％以上的占空比。 在第一持续时间内的交流电压的周期数为两个或更多个，并且在转换到第二持续时间之前，AC电压具有用于将调色剂拖回显影辊的方向上的电压。 显影单元抑制由于显影间隙的波动引起的图像不均匀的发生。 因此，配备有显影单元的图像形成装置在抑制图像不均匀的同时形成高质量图像。

公开(公告)号：US20080298847A1

公开(公告)日：2008-12-04

申请号：US12127151

申请日：2008-05-27

申请人： Toyotsune Inoue ,  Takahisa Nakaue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Shoichi Sakata ,  Yukihiro Mori

发明人： Toyotsune Inoue ,  Takahisa Nakaue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Shoichi Sakata ,  Yukihiro Mori

IPC分类号： G03G15/09

CPC分类号： G03G15/095 ,  G03G15/0815

摘要： A developing device uses a two-component developer including at least carriers and toners. The toners are supplied to an image bearing member bearing an electrostatic latent image so that a toner image is developed from the electrostatic latent image. The developing device has a developing roller arranged to oppose the image bearing member; and a magnetic roller arranged to oppose the developing roller. The magnetic roller retains the two-component developer to supply toners to the developing roller. The developing roller and the magnetic roller are rotationally driven in directions to be opposite from one another at an opposed position, and a magnetic pole of the magnetic roller and a magnetic pole of the developing roller have magnetic polarities different from one another at the opposed position. A surface roughness of the magnetic roller is greater than a surface roughness of the developing roller.

摘要翻译： 显影装置使用包括至少载体和调色剂的双组分显影剂。 将调色剂供应到承载静电潜像的图像承载部件，使得调色剂图像从静电潜像显影。 显影装置具有布置成与图像承载部件相对的显影辊; 以及布置成与显影辊相对的磁辊。 磁性辊保持双组分显影剂以将调色剂供应到显影辊。 显影辊和磁性辊在相对位置上被相互旋转的方向旋转驱动，磁性辊的磁极和显影辊的磁极在相对位置处具有彼此不同的磁极性 。 磁辊的表面粗糙度大于显影辊的表面粗糙度。

公开(公告)号：US20080232862A1

公开(公告)日：2008-09-25

申请号：US12051186

申请日：2008-03-19

申请人： Masashi Fujishima ,  Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Yukihiro Mori

发明人： Masashi Fujishima ,  Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Yukihiro Mori

IPC分类号： G03G15/08

CPC分类号： G03G15/0921 ,  G03G15/0818 ,  G03G2215/0609

摘要： An image forming apparatus has a photoconductive member, and a developing roller develops a latent image on the photoconductive member by a first alternating-current bias in the form of a rectangular wave. The following relationships are satisfied in calculating the duty ratio (D1) of the first alternating-current bias using an application period of voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period: a CV value in the number particle size distribution of the toner is ≦25%, 4 μm≦Dt≦7 μm, 105 Ω·cm≦pv≦109 QΩcm, 0.4 μm≦Ra≦1.5 μm, and 35%≦D1≦75%. where Dt denotes the volume average particle diameter of the toner, pv denotes the intrinsic resistance value of a developing roller surface, Ra denotes the arithmetic average roughness of the developing roller surface.

摘要翻译： 图像形成装置具有感光体，并且显影辊通过矩形波形式的第一交流偏压在感光体上显影潜像。 在使用调色剂从显影辊向感光体传送调色剂的方向上，使用电压施加期间计算第一交流偏压的占空比（D 1）为以下关系：CV值 在调色剂的数量粒度分布为<= 25％，4μm<= Dt <=7μm，10±5cm -1 = 10 < > QOmegacm，0.4mg

公开(公告)号：US20080226320A1

公开(公告)日：2008-09-18

申请号：US12042684

申请日：2008-03-05

申请人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

发明人： Shoichi Sakata ,  Takahisa Nakaue ,  Toyotsune Inoue ,  Akihiro Watanabe ,  Masashi Fujishima ,  Yukihiro Mori

IPC分类号： G03G15/06

CPC分类号： G03G15/065

摘要： A developing unit has a voltage-applicator (80) to apply a developing bias voltage to a developing roller (72). The voltage-applicator (80) applies the developing bias voltage for a first duration to apply an AC voltage having a rectangular waveform, and a second duration to stop applying the AC voltage. The AC voltage has a duty ratio of 50% or more in a direction for causing toner to develop an electrostatic latent image. The number of cycles of the AC voltage in the first duration is two or more, and the AC voltage has a voltage in a direction for pulling the toner back to the developing roller, just before transition to the second duration. The developing unit suppresses occurrence of image unevenness due to a fluctuation in developing gap. Thus, an image forming apparatus equipped with the developing unit forms a high-quality image while suppressing image unevenness.

摘要翻译： 显影单元具有向显影辊（72）施加显影偏压的电压施加器（80）。 电压施加器（80）施加显影偏压第一持续时间以施加具有矩形波形的交流电压和第二持续时间以停止施加AC电压。 AC电压在使调色剂显影静电潜像的方向上具有50％以上的占空比。 在第一持续时间内的交流电压的周期数为两个或更多个，并且在转换到第二持续时间之前，AC电压具有用于将调色剂拖回显影辊的方向上的电压。 显影单元抑制由于显影间隙的波动引起的图像不均匀的发生。 因此，配备有显影单元的图像形成装置在抑制图像不均匀的同时形成高质量图像。

公开(公告)号：US20080292365A1

公开(公告)日：2008-11-27

申请号：US12123553

申请日：2008-05-20

申请人： Masashi Fujishima ,  Shoichi Sakata ,  Takahisa Nakaue ,  Yukihiro Mori

发明人： Masashi Fujishima ,  Shoichi Sakata ,  Takahisa Nakaue ,  Yukihiro Mori

IPC分类号： G03G15/08

CPC分类号： G03G15/0808

摘要： An image forming apparatus is characterized in that an absolute value of a difference between a first coefficient of variation in a number distribution of the particle diameter of a toner carried on a developing roller and a second coefficient of variation in a number distribution of the particle diameter of a toner in a two-component developer carried on the magnetic roller is within 5% and an absolute value of a difference between a third coefficient of variation in a number distribution of the particle diameter of a toner of a toner image developed on the outer surface of an image bearing member and the second coefficient of variation is within 6%. With such an image forming apparatus, high-quality images can be stably formed over a long term.

摘要翻译： 图像形成装置的特征在于，显影辊承载的调色剂的粒径的数量分布的第一变异系数与粒径的数量分布的第二变异系数之间的差的绝对值 承载在磁性辊上的双组分显影剂中的调色剂的绝对值在5％以内，并且在外部显影的调色剂图像的调色剂的粒径的数量分布的第三变异系数之间的差异的绝对值 图像承载部件的表面和第二变异系数在6％以内。 利用这种图像形成装置，可以长期稳定地形成高质量的图像。

公开(公告)号：US20080232860A1

公开(公告)日：2008-09-25

申请号：US12050466

申请日：2008-03-18

申请人： Shoichi Sakata ,  Takahisa Nakaue ,  Kiyotaka Kobayashi ,  Yukihiro Mori

发明人： Shoichi Sakata ,  Takahisa Nakaue ,  Kiyotaka Kobayashi ,  Yukihiro Mori

IPC分类号： G03G15/09

CPC分类号： G03G15/0907

摘要： An image forming apparatus is provided with a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image formed on the photoconductive member by a first bias, and a magnetic roller for forming a magnetic brush thereon with a two-component developer and forming a thin toner layer on the developing roller by a second bias. If (D1) denotes the duty ratio of a first alternating-current bias included in the first bias and (D2) denotes the duty ratio of a second alternating-current bias included in the second bias, the duty ratios (D1, D2) satisfy the following relationship: D1>100−D2.

摘要翻译： 图像形成装置设置有要在其上形成潜像的感光体，用于通过第一偏压将形成在感光体上的潜像显影的显影辊和用于在其上形成磁刷的磁辊， 双组分显影剂并通过第二偏压在显影辊上形成薄的调色剂层。 如果（D 1）表示包括在第一偏压中的第一交流偏压的占空比，（D 2）表示包括在第二偏压中的第二交流偏压的占空比，占空比（D 1， D 2）满足以下关系：<？in-line-formula description =“In-line Formulas”end =“lead”？> D1> 100-D2。 <？in-line-formula description =“In-line Formulas”end =“tail”？>