公开(公告)号：US09256188B2

公开(公告)日：2016-02-09

申请号：US14662865

申请日：2015-03-19

Applicant: Konica Minolta, Inc.

Inventor： Toru Kasamatsu ,  Mikiyuki Aoki ,  Yohei Yamada ,  Kouei Cho

IPC: G03G15/00 ,  G03G15/06

CPC classification number: G03G15/80 ,  G03G15/065

Abstract: An image forming apparatus having image supporting members and developing devices provided for a plurality of colors respectively, and a developing bias source. The developing bias source includes DC power circuits provided for the colors respectively, an AC power circuit provided for use in common for all of the colors, and an element provided for at least one of the colors other than black. The developing bias source generates developing biases by superimposing an AC voltage output from the AC power circuit on DC voltages output from the DC power circuits and applies the developing biases to the respectively corresponding developing devices. The element maintains a constant voltage having a potential of an opposite polarity to a potential of charged toner used for the development. The developing bias source further superimposes the constant voltage on the developing bias for the at least one of the colors other than black.

Abstract translation: 具有分别设置有多种颜色的图像支持部件和显影装置的图像形成装置和显影偏压源。 显影偏压源包括分别为颜色提供的DC电源电路，为所有颜色共同使用而设置的AC电源电路，以及为黑色以外的至少一种颜色提供的元件。 显影偏压源通过将从AC电源电路输出的AC电压叠加在从DC电源电路输出的直流电压上产生显影偏压，并将显影偏压施加到相应的显影装置。 该元件保持具有与用于显影的带电调色剂的电位相反极性的电位的恒定电压。 显影偏压源进一步将恒定电压叠加在黑色以外的至少一种颜色的显影偏压上。

公开(公告)号：US11990856B2

公开(公告)日：2024-05-21

申请号：US17854777

申请日：2022-06-30

Applicant: Konica Minolta, Inc.

Inventor： Yuta Tachibana ,  Hiroyuki Yoshikawa ,  Kazumichi Yoshida ,  Satoshi Miyajima ,  Kouei Cho

IPC: H02P21/18 ,  H02P6/16 ,  H02P21/22

CPC classification number: H02P6/16 ,  H02P21/22

Abstract: A rotation detector includes a motor, a current detector and a hardware processor. The motor includes coils of two or more phases and a rotor. The current detector detects currents flowing in coils of at least two phases among the coils of two or more phases. The hardware processor estimates an initial position of the rotor based on current values of the currents detected by the current detector to start the motor, controls an energization pattern on the phases to rotate and start the motor based on the estimated initial position, and determines whether the rotor stops or is rotating before completing the estimation of the initial position.

公开(公告)号：US11221578B2

公开(公告)日：2022-01-11

申请号：US16703238

申请日：2019-12-04

Applicant: Konica Minolta, Inc.

Inventor： Taku Kimura ,  Masahiro Kamiya ,  Junichi Masuda ,  Masahiro Nonoyama ,  Kouei Cho ,  Akimasa Ishikawa

IPC: G03G15/00 ,  B65H9/00 ,  B65H5/06

Abstract: An image forming apparatus includes: a conveyance path that conveys a sheet; registration rollers that are arranged across the conveyance path and each comprise a nip part; a sheet locking member that locks a front end of a sheet conveyed in the conveyance path, where the sheet locking member swings between a first attitude and a second attitude, in the first attitude the sheet locking member locks the sheet on an upstream side of the nip part, and in the second attitude the sheet locking member is retracted to a downstream side of the nip part and allows the sheet to pass through the nip part; an energizer that energizes the sheet locking member to maintain the first attitude; and a hardware processor that detects deterioration of the energizer.

公开(公告)号：US10313546B2

公开(公告)日：2019-06-04

申请号：US15717979

申请日：2017-09-28

Applicant: Konica Minolta, Inc.

Inventor： Takashi Watanabe ,  Kazutoshi Yoshimura ,  Kiyohito Tsujihara ,  Akinori Kimata ,  Shiro Umeda ,  Kouei Cho

IPC: H04N1/04 ,  H04N1/00

Abstract: An image reading apparatus for separating and conveying documents from a bundle of documents, causing the document to pass through a reading position, and reading an image from the document, includes: a reading translucent plate; a rotation member capable of rotating around a shaft; and a rotation driver that rotates the rotation member, wherein in the rotation member, each of: a cleaning member; a white reference area; and an end portion detection area is formed partially with regard to a circumferential direction, the cleaning member and the end portion detection area are arranged adjacent to each other, the rotation driver is arranged so that the end portion detection area faces an opposing surface, and the rotation member is rotated in a paper interval period from when a trailing edge of the document passes the reading position to when a leading edge of a subsequent document reaches the reading position.

公开(公告)号：US10148167B2

公开(公告)日：2018-12-04

申请号：US15655986

申请日：2017-07-21

Applicant: KONICA MINOLTA, INC.

Inventor： Toru Kasamatsu ,  Mikiyuki Aoki ,  Kouei Cho

IPC: H02M1/36 ,  G03G15/00 ,  H02M3/28 ,  H02M3/335 ,  H02M1/00

Abstract: A power supply device includes: a first transformer including a primary winding and a secondary winding; a first control circuit controlling a switching operation of a switch element, and cause the primary winding to generate a first AC voltage; an application circuit receiving a second AC voltage generated in the secondary winding by mutual induction with the primary winding, and apply an output voltage according to the second AC voltage to a load; a voltage detection circuit detecting a magnitude of a DC voltage obtained by rectifying the first AC voltage or the second AC voltage; and an output circuit outputting a stop signal indicating stop of the power supply device, when a result of comparison between the magnitude of the DC voltage and a threshold value set according to a magnitude of the load satisfies a predetermined condition, after reception of an instruction to stop voltage supply.

公开(公告)号：US09250556B2

公开(公告)日：2016-02-02

申请号：US13887795

申请日：2013-05-06

Applicant: KONICA MINOLTA, INC.

Inventor： Munehiro Natsume ,  Teruhiko Toyoizumi ,  Nobuhiro Matsuo ,  Kouei Cho

IPC: G03G15/02 ,  G03G21/20 ,  G03G15/01

CPC classification number: G03G15/0258 ,  G03G15/0189 ,  G03G15/0266 ,  G03G15/0291 ,  G03G21/206 ,  G03G2215/0132 ,  G03G2215/0164

Abstract: An image forming apparatus having; an electrostatic latent image support; a charger for charging the electrostatic latent image support; an exposure unit for exposing the electrostatic latent image support with a light beam to form an electrostatic latent image; a development unit for developing the electrostatic latent image into a toner image; a sheet feeding unit for feeding a recording sheet in an image forming operation; a transfer member for transferring the toner image to the recording sheet; a fuser for fusing the toner image onto the recording sheet; and a high-voltage power supply circuit for, in an image forming operation, applying a plurality of bias voltages at least to the charger and to the development unit, wherein the high-voltage power supply circuit supplies a high voltage only to the charger in an operation in an ion generation mode so as to cause the charger to generate ions.

Abstract translation: 一种图像形成装置，具有： 静电潜像载体; 用于对静电潜像载体进行充电的充电器; 曝光单元，用于用光束曝光所述静电潜像载体以形成静电潜像; 用于将静电潜像显影成调色剂图像的显影单元; 用于在成像操作中馈送记录纸的供纸单元; 用于将调色剂图像转印到记录片材的转印部件; 定影器，用于将调色剂图像定影到记录纸上; 以及用于在图像形成操作中至少向充电器和显影单元施加多个偏置电压的高压电源电路，其中高压电源电路仅向充电器提供高电压 离子发生模式的操作，以使充电器产生离子。