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公开(公告)号：US11378901B2
公开(公告)日：2022-07-05
申请号：US17342134
申请日：2021-06-08
发明人： Yusaku Iwasawa , Yasutaka Yagi , Ken Yokoyama , Hiroyuki Seki
IPC分类号： G03G15/16
摘要： An image forming apparatus includes image bearing members, an intermediary transfer member having ion conductivity, primary transfer members, a first voltage applying portion, a secondary transfer member, a second voltage applying portion, and a controller. On the basis of image information, the controller controls a transfer voltage applied to the secondary transfer member so as to be different between a first voltage when a first region, in which a coverage indicating a ratio occupied by an image region per predetermined area is a first coverage passes through the secondary transfer portion and a second voltage when a second region, in which the coverage is a second coverage larger than the first coverage, passes through the secondary transfer portion. The controller controls a change amount of the first voltage with respect to the second voltage so as to be different between a first mode and a second mode.
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公开(公告)号：US11022922B2
公开(公告)日：2021-06-01
申请号：US16901438
申请日：2020-06-15
发明人： Shuji Saito , Seiji Nakahara , Ken Yokoyama , Hiroshi Kita , Koujirou Izumidate , Kazushi Ino
摘要： An image forming apparatus including: a movable intermediate transfer member onto which a toner image borne by an image bearing member is to be transferred; a detection unit configured to irradiate the toner image on the intermediate transfer member with light to detect reflected light; and a control unit configured to adjust a condition for forming the toner image based on a detection result of the detection unit, wherein a plurality of grooves extending along a movement direction of the intermediate transfer member are formed in a surface of the intermediate transfer member in a width direction intersecting the movement direction, and wherein grooves, formed within a range of the intermediate transfer member to which the light is irradiated by the detection unit, among the plurality of grooves are formed so that intervals each between adjacent grooves with respect to the width direction are regularly changed within a predetermined range.
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公开(公告)号：US10691057B2
公开(公告)日：2020-06-23
申请号：US16450479
申请日：2019-06-24
发明人： Taisuke Minagawa , Ken Yokoyama , Yasuharu Hirado
摘要： A controller controls a secondary transfer power source such that a current having a first value flows in a secondary transfer portion in a case where a transfer material with an image formed on a first surface thereof has been conveyed for less than a predetermined amount of time in a second conveyance path. Moreover, the controller controls the secondary transfer power source such that a current having a second value larger in absolute value than the first value flows in the secondary transfer portion in a case where the transfer material with an image formed on the first surface thereof is conveyed to the secondary transfer portion after waiting for the predetermined amount of time or more in the second conveyance path.
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4.发明申请公开(公告)号：US20190332040A1
公开(公告)日：2019-10-31
申请号：US16383304
申请日：2019-04-12
发明人： Ken Yokoyama , Shuji Saito , Koujirou Izumidate
摘要： An image forming apparatus includes an intermediate transfer member. The intermediate transfer member includes a layer made of an acrylic copolymer. A plurality of grooves is formed in the layer along a moving direction of the intermediate transfer member across a width direction of the intermediate transfer member. A groove distance that is an average distance between adjoining grooves of the plurality of grooves in the width direction of the intermediate transfer member is 2 μm or more and 10 μm or less.
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公开(公告)号：US20220026832A1
公开(公告)日：2022-01-27
申请号：US17497465
申请日：2021-10-08
发明人： Ken Yokoyama , Shuji Saito , Koujirou Izumidate
摘要： An image forming apparatus includes an intermediate transfer member. The intermediate transfer member includes a layer made of an acrylic copolymer. A plurality of grooves is formed in the layer along a moving direction of the intermediate transfer member across a width direction of the intermediate transfer member. A groove distance that is an average distance between adjoining grooves of the plurality of grooves in the width direction of the intermediate transfer member is 2 μm or more and 10 μm or less.
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公开(公告)号：US20210382416A1
公开(公告)日：2021-12-09
申请号：US17342134
申请日：2021-06-08
发明人： Yusaku Iwasawa , Yasutaka Yagi , Ken Yokoyama , Hiroyuki Seki
IPC分类号： G03G15/16
摘要： An image forming apparatus includes image bearing members, an intermediary transfer member having ion conductivity, primary transfer members, a first voltage applying portion, a secondary transfer member, a second voltage applying portion, and a controller. On the basis of image information, the controller controls a transfer voltage applied to the secondary transfer member so as to be different between a first voltage when a first region in which a coverage indicating a ratio occupied by an image region per predetermined area is a first coverage passes through the secondary transfer portion and a second voltage when a second region in which the coverage is a second coverage larger than the first coverage passes through the secondary transfer portion. The controller controls a change amount of the first voltage with respect to the second voltage so as to be different between a first mode and a second mode.
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公开(公告)号：US20200004193A1
公开(公告)日：2020-01-02
申请号：US16450479
申请日：2019-06-24
发明人： Taisuke Minagawa , Ken Yokoyama , Yasuharu Hirado
摘要： A controller controls a secondary transfer power source such that a current having a first value flows in a secondary transfer portion in a case where a transfer material with an image formed on a first surface thereof has been conveyed for less than a predetermined amount of time in a second conveyance path. Moreover, the controller controls the secondary transfer power source such that a current having a second value larger in absolute value than the first value flows in the secondary transfer portion in a case where the transfer material with an image formed on the first surface thereof is conveyed to the secondary transfer portion after waiting for the predetermined amount of time or more in the second conveyance path.
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公开(公告)号：US20180253036A1
公开(公告)日：2018-09-06
申请号：US15910464
申请日：2018-03-02
IPC分类号： G03G15/16
CPC分类号： G03G15/167 , G03G15/1615 , G03G15/5008 , G03G15/75 , G03G2215/00075
摘要： In an image forming apparatus, a peripheral velocity difference is provided between a peripheral velocity of an intermediate transfer belt and a peripheral velocity of an image bearing member, and when a relative moving distance between the image bearing member and the intermediate transfer belt, which is generated in the transfer nip portion because of the peripheral velocity difference, is taken as a shift amount of the toner image, a lower limit value of the shift amount is set to be at least ⅜, preferably half of an average perimeter calculated from a weight-average particle diameter of the toner, which is measured in advance.
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9.发明申请公开(公告)号：US20160248943A1
公开(公告)日：2016-08-25
申请号：US15042699
申请日：2016-02-12
发明人： Ken Yokoyama
CPC分类号： H04N1/6075 , G03G15/5058 , G03G15/55 , G03G2215/00569 , H04N1/6033
摘要： The image forming apparatus configured to execute density control, includes a printer engine configured to indicate a plurality of images obtained by changing an image level in a stepwise manner, and a CPU configured to determine whether or not the density control is to be executed based on an allowance level selected from among the image levels corresponding to the plurality of images and on information on whether or not the density control is to be executed, which is set for each image level.
摘要翻译： 被配置为执行浓度控制的图像形成装置包括：打印机引擎，被配置为指示通过逐步地改变图像级别获得的多个图像;以及CPU，被配置为基于以下步骤来确定是否执行浓度控制： 从与多个图像对应的图像级别中选择的允许级别以及针对每个图像级别设置的关于是否要执行密度控制的信息。
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公开(公告)号：US20140169840A1
公开(公告)日：2014-06-19
申请号：US14102988
申请日：2013-12-11
发明人： Ken Yokoyama , Tsubasa Takeuchi
IPC分类号： G03G15/01
CPC分类号： G03G15/1615 , G03G15/0136 , G03G2215/0193
摘要： The image forming apparatus is capable of changing a state between a first state in which only a first image bearing member and transfer belt contact each other, and a second state in which respective image bearing members are separated from the transfer belt. A second transfer member is located at a first separating portion at which the second transfer member is separated from the image bearing member in the first state, and is located at a second separating portion closer to the second image bearing member than the first separating portion in the second state to regulate the position of the transfer belt.
摘要翻译： 图像形成装置能够改变仅第一图像承载部件和转印带彼此接触的第一状态和各图像承载部件与转印带分离的第二状态。 第二转印部件位于第一分离部分处，在第一分离部分处，第二转印部件在第一状态下与图像承载部件分离，并且位于比第一分离部分更靠近第二图像承载部件的第二分离部分 第二种调节转印带位置的状态。
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