公开(公告)号：US11693350B2

公开(公告)日：2023-07-04

申请号：US17858446

申请日：2022-07-06

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Kazunori Tanaka ,  Yasuhiro Tauchi

IPC: G03G15/08 ,  G03G15/00

CPC classification number: G03G15/80

Abstract: An image forming apparatus includes an amorphous silicon photosensitive member, a developing device including a developer carrying member that carries a two-component developer, and a control portion. When a potential difference V0−Vdc between the photosensitive member and the developer carrying member has a first potential difference at which the toner is moved from the developer carrying member to the photosensitive member and a second potential difference at which the toner is moved from the photosensitive member to the developer carrying member, the control portion adjusts V0 or Vdc so that the first potential difference and the second potential difference are equal in value and opposite in polarity, and a first development current |Ia| that flows at the first potential difference and a second development current |Ib| that flows at the second potential difference satisfy 1.9×10−2≥|Ib|/N≥5.7×103 [μA/mm].

公开(公告)号：US09285713B2

公开(公告)日：2016-03-15

申请号：US14680147

申请日：2015-04-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Sakae Saito ,  Hiroaki Sakai ,  Yukimasa Watanabe ,  Yasuhiro Oishi ,  Masashi Fujishima ,  Chikara Ishihara ,  Yasuhiro Tauchi

IPC: G03G15/09 ,  G03G15/08

CPC classification number: G03G15/0907 ,  G03G15/0818 ,  G03G2215/0863

Abstract: A developing device supplies a developer to a photosensitive drum, which has a cylindrical shape, and is rotatable around an axis thereof for forming an electrostatic latent image on the circumferential surface thereof. The developing device is provided with a developing roller. The developing roller is disposed to face the photosensitive drum, and has a cylindrical shape. The developing roller is rotatable around an axis thereof for carrying a developer on the circumferential surface thereof. The developing roller is provided with a small diameter portion. The small diameter portion is a part of the circumferential surface of the developing roller. The small diameter portion extends from an axial end of the developing roller axially inward by a predetermined length, and has an outer diameter smaller than an axially middle portion of the developing roller.

Abstract translation: 显影装置将显影剂供应到具有圆柱形形状的感光鼓，并且可以围绕其轴线旋转以在其圆周表面上形成静电潜像。 显影装置设有显影辊。 显影辊设置成面对感光鼓，并且具有圆柱形形状。 显影辊可绕其轴线转动，用于在其圆周表面上承载显影剂。 显影辊设置有小直径部分。 小直径部分是显影辊的圆周表面的一部分。 小直径部分从显影辊的轴向端部轴向向内延伸预定长度，并且其外径小于显影辊的轴向中间部分。

公开(公告)号：US11163243B2

公开(公告)日：2021-11-02

申请号：US17206261

申请日：2021-03-19

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Norio Kubo ,  Asami Sasaki ,  Yasuhiro Tauchi ,  Yuji Toyota

IPC: G03G15/06

Abstract: A bias condition determiner executes, in order, a first direct current voltage determination mode (first DC calibration) for determining a provisional reference direct current voltage that is a provisional reference for a direct current voltage of a developing bias applied to a developing roller, an inter-peak voltage determination mode (AC calibration) for determining a reference inter-peak voltage that is a reference for an inter-peak voltage of an alternating current voltage of the developing bias applied to the developing roller in an image forming operation, and a second direct current voltage determination mode (second DC calibration) for determining a reference direct current voltage that is a reference for the direct current voltage of the developing bias applied to the developing roller in the image forming operation.

公开(公告)号：US10691052B2

公开(公告)日：2020-06-23

申请号：US16554448

申请日：2019-08-28

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Akifumi Yamaguchi ,  Yasuhiro Tauchi ,  Kenichi Tamaki ,  Koji Suenami

IPC: G03G15/00

Abstract: In the first charge amount acquisition operation, based on density of a plurality of toner images for measurement or based on a direct component of a developing current at the time of forming the plurality of toner images in addition to the density of the plurality of toner images for measurement, the charge amount acquisition section acquires a first toner charge amount that is a charge amount of toner included in the toner image for measurement. In the second charge amount acquisition operation, based on the toner density detected at the time of image formation and a relationship between the first toner charge amount and the toner density detected in the first charge amount acquisition operation, the charge amount acquisition section acquires a second toner charge amount that is a charge amount of the toner in the development device.

公开(公告)号：US20190369523A1

公开(公告)日：2019-12-05

申请号：US16424674

申请日：2019-05-29

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Akifumi Yamaguchi ,  Yasuhiro Tauchi ,  Eiji Gyotoku ,  Yu Sasaki

IPC: G03G15/06

Abstract: An image forming apparatus includes a developer information acquisition unit. The developer information acquisition unit performs a developer deterioration information acquisition operation. In the developer deterioration information acquisition operation, the developer information acquisition unit acquires a tilt of a measurement straight line representing the relationship between the change amount of the frequency in a first measurement toner image forming operation and the density change amount of the measurement toner image based on the change amount of the frequency in the first measurement toner image forming operation and a result of detecting density of the measurement toner image in a density detecting unit, and acquires a toner charging amount based on the acquired tilt of the measurement straight line and the reference information in the storage unit so as to acquire information relating to deterioration of developer based on the acquired toner charging amount.

公开(公告)号：US20170299977A1

公开(公告)日：2017-10-19

申请号：US15480473

申请日：2017-04-06

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Yasuhiro Tauchi

IPC: G03G15/08 ,  G03G15/09

CPC classification number: G03G15/0812 ,  G03G15/0889 ,  G03G15/0893 ,  G03G15/0921 ,  G03G15/0928

Abstract: A developing device includes a housing, a developing roller, a developer stirring member, and a layer thickness regulating member. The developing roller includes a stationary magnet and a sleeve. The stationary magnet includes a first magnetic pole having a specific polarity, and a second magnetic pole lying downstream of the first magnetic pole and having the same polarity as the first magnetic pole. In an entire inter-pole region between the first magnetic pole and the second magnetic pole, the stationary magnet produces a magnetic force including a horizontal component that keeps the specific polarity and has a value greater than zero (mT). The inter-pole region includes a flat area where a horizontal magnetic force component having a minimum absolute value exits and the horizontal magnetic force component changes within a range of 0.5 (mT) or less, the flat area extending over a range of 10 degrees or more.

公开(公告)号：US20150177642A1

公开(公告)日：2015-06-25

申请号：US14571152

申请日：2014-12-15

Applicant: KYOCERA Document Solutions Inc.

Inventor： Yoshinobu Yoneima ,  Yuji Kamiyama ,  Akihiro Watanabe ,  Tamotsu Shimizu ,  Shizuka Okada ,  Sakae Saito ,  Yasuhiro Oishi ,  Chikara Ishihara ,  Masashi Fujishima ,  Yoshimi Shimizu ,  Yasuhiro Tauchi ,  Yu Sasaki

IPC: G03G15/09

CPC classification number: G03G15/0808 ,  G03G15/0818 ,  G03G15/09

Abstract: A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. A resin coat layer has been formed on an outer circumferential surface of the roller main body, the resin coat layer being made of a resin material having electric conductivity. A product of resistance component Rs [Ω] and electrostatic capacitance component Cs [F] in AC impedance Z of the roller main body is in a range from 2.79×10−7 to 6.77×10−5, the AC impedance Z being obtained when an AC voltage of a predetermined frequency f is applied.

Abstract translation: 显影辊包括辊状主体，其被设置为面对而不接触图像载体的外周表面。 在辊主体的外周面上形成树脂涂层，树脂涂层由具有导电性的树脂材料制成。 辊主体的交流阻抗Z中的电阻分量Rs [＆OHgr]和静电电容分量Cs [F]的乘积在2.79×10-7至6.77×10-5的范围内，获得AC阻抗Z 当施加预定频率f的AC电压时。

公开(公告)号：US11914312B2

公开(公告)日：2024-02-27

申请号：US17858537

申请日：2022-07-06

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Yuji Toyota ,  Yasuhiro Tauchi

IPC: G03G15/09 ,  G03G15/08 ,  G03G9/113

CPC classification number: G03G15/0928 ,  G03G9/1136 ,  G03G9/1139 ,  G03G15/0812 ,  G03G2215/0609

Abstract: A developing device includes a developing container storing a two-component developer containing a magnetic carrier and a toner, a developer carrying member carrying the developer on its outer circumferential surface, and a regulation member arranged to be opposed at a prescribed distance to the developer carrying member. The developer carrying member includes a developing sleeve on which a magnetic brush is formed, and a magnet secured in the developing sleeve and having a plurality of magnetic poles including a regulation pole opposed to the regulation member and a downstream-side magnetic pole arranged downstream of the regulation pole with respect to the rotation direction of the developing sleeve. The magnet is such that the vertical magnetic force gradient [mT/°] has a local minimum value near a position at which the vertical magnetic force is 0 [mT] between the downstream-side surface of the regulation member and the downstream-side magnetic pole.

公开(公告)号：US11782357B2

公开(公告)日：2023-10-10

申请号：US17859307

申请日：2022-07-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Yuji Toyota ,  Yasuhiro Tauchi

IPC: G03G15/08 ,  G03G15/09

CPC classification number: G03G15/0812 ,  G03G15/09

Abstract: A developing device includes a developing container storing a two-component developer, a developer carrying member, and a regulation member. The developer carrying member includes a developing sleeve, and a magnet having a regulation pole opposite the regulation member and a main pole opposite the image carrying member. The regulation member is arranged downstream of the position at which the vertical magnetic force of the regulation pole is 0 [mT] but upstream of a position at which the vertical and horizontal magnetic forces of the regulation pole are equal. Let the horizontal magnetic force gradient at the position at which the horizontal magnetic force of the main pole is 0 [mT] be A and the horizontal magnetic force gradient at the upstream-side surface of the regulation member along the rotation direction of the developing sleeve be B, then |A|>2.45 and |B|

公开(公告)号：US20200073308A1

公开(公告)日：2020-03-05

申请号：US16554448

申请日：2019-08-28

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Akifumi Yamaguchi ,  Yasuhiro Tauchi ,  Kenichi Tamaki ,  Koji Suenami

IPC: G03G15/00

Abstract: In the first charge amount acquisition operation, based on density of a plurality of toner images for measurement or based on a direct component of a developing current at the time of forming the plurality of toner images in addition to the density of the plurality of toner images for measurement, the charge amount acquisition section acquires a first toner charge amount that is a charge amount of toner included in the toner image for measurement. In the second charge amount acquisition operation, based on the toner density detected at the time of image formation and a relationship between the first toner charge amount and the toner density detected in the first charge amount acquisition operation, the charge amount acquisition section acquires a second toner charge amount that is a charge amount of the toner in the development device.