公开(公告)号：US20240142891A1

公开(公告)日：2024-05-02

申请号：US18489272

申请日：2023-10-18

Applicant: KYOCERA Document Solutions Inc.

Inventor： Minoru WADA ,  Takahiro OKUBO ,  Takeru NAGAMOTO

IPC: G03G15/08 ,  G03G9/08

CPC classification number: G03G15/0812 ,  G03G9/0821 ,  G03G15/0818 ,  G03G2215/0617

Abstract: An image forming apparatus includes an image carrying member, a charging device, an exposure device, a developing device, a development voltage power supply, and a control section. The developing device includes a development container which contains a non-magnetic one-component developer and a developer carrying member which includes a rotary shaft and a roller portion stacked on the outer circumferential surface of the rotary shaft, and the resistance value of the roller portion is 9 to 11 [Log Ω], and when the amount of toner conveyed on the developer carrying member is Md [g/m2], the amount of toner adhered on the image carrying member in a solid image is Mp [g/m2], the peripheral speed of the developer carrying member and the image carrying member are Sd [mm/sec] and Sp [mm/sec], 0.8×Sd/Sp

公开(公告)号：US20210286288A1

公开(公告)日：2021-09-16

申请号：US17193719

申请日：2021-03-05

Applicant: KYOCERA Document Solutions Inc.

Inventor： Takahiro OKUBO

IPC: G03G15/08

Abstract: An image forming apparatus includes an image forming unit, a toner detection sensor, a storage unit, and a control unit. The image forming unit includes an image carrier, a charging device, an exposure device, and a developing device. The toner detection sensor detects toner in the developing device. The control unit predicts transition of the toner deterioration degree in the developing device using the toner consumption amount and the cumulative operating time stored in the storage unit, and a predetermined toner deterioration model. The control unit is capable of measuring the toner deterioration degree based on amplitude of an output value of the toner detection sensor, and corrects the toner deterioration model, if the measured value of the toner deterioration degree is apart from the predicted value of the toner deterioration degree by a predetermined value or more.

公开(公告)号：US20210149320A1

公开(公告)日：2021-05-20

申请号：US17098405

申请日：2020-11-15

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Takahiro OKUBO ,  Yohei WAKASA ,  Kazuhiro NAKACHI

IPC: G03G15/06 ,  G03G15/00

Abstract: Provided is an image forming apparatus having a simple configuration capable of measuring a toner current included in a developing current and accurately calculating a toner charge amount based on the measurement result. The developing device has a developer carrier that carries a two-component developer including a magnetic carrier and toner. The density detecting device detects the density of the toner image. The current detecting unit detects a DC component of a developing current that flows when a developing voltage is applied to the developer carrier. The control unit, in a state in which the image carrier is rotated at two or more different linear speeds during non-image formation, forms the same reference image on the image carrier by the developing device, and estimates the toner charge amount based on the developing current when the reference image is formed and the density of the reference image.

公开(公告)号：US20210041808A1

公开(公告)日：2021-02-11

申请号：US16984788

申请日：2020-08-04

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Takahiro OKUBO ,  Mitsuhiro HASHIMOTO ,  Kazuhiro NAKACHI ,  Shiro KANEKO

IPC: G03G15/16 ,  G03G15/00 ,  G03G15/20

Abstract: An image forming apparatus includes an image forming portion, a high-voltage generation circuit, a current detection portion and a control portion. The image forming portion includes an image carrying member, a charging device, an exposure device and a developing device which includes a developer carrying member for carrying a two-component developer. The control portion can perform a transfer memory prediction mode that includes a step of estimating, when a first reference image is formed, the level of occurrence of transfer memory based on the direct-current component of a development current flowing through the developer carrying member and a step of measuring, when the measured direct-current component of the development current is larger than a predetermined value, the amount of charge of the toner within the developing device and estimating the cause of occurrence of the transfer memory based on the measured amount of charge of the toner.

公开(公告)号：US20210041802A1

公开(公告)日：2021-02-11

申请号：US16985151

申请日：2020-08-04

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Mitsuhiro HASHIMOTO ,  Takahiro OKUBO ,  Kazuhiro NAKACHI ,  Shiro KANEKO

IPC: G03G15/06 ,  G03G15/08

Abstract: An image forming apparatus includes an image forming portion, a high-voltage generation circuit, a current detection portion and a control portion. The image forming portion includes an image carrying member, a charging device, an exposure device and a developing device which includes a developer carrying member for carrying a developer including a carrier and a toner. The control portion can perform a development ghost prediction mode that includes a step of measuring the amount of charge of the toner within the developing device at the time of non-image formation, a step of measuring, as a carrier current, the direct-current component of a development current when the amount of development of the toner is 0 [mg/cm2] and a step of estimating the level of occurrence of development ghost and the cause of occurrence based on the amount of charge of the toner and the carrier current which are measured.

公开(公告)号：US20160334732A1

公开(公告)日：2016-11-17

申请号：US15133964

申请日：2016-04-20

Applicant: KYOCERA Document Solutions Inc.

Inventor： Takahiro OKUBO

IPC: G03G15/06 ,  G03G15/02

CPC classification number: G03G15/0283 ,  G03G15/0216 ,  G03G15/0266 ,  G03G15/065

Abstract: An image forming apparatus has an image carrier, a charger, a developing device, a voltage application unit, and a controller. The developing device includes a developing roller. The voltage application unit applies a voltage to the developing roller and to the charger. The controller controls the voltage application unit. The controller controls the voltage application unit such that a developing bias having an AC voltage superposed on a DC voltage is applied to the developing roller and a charging bias including at least a DC voltage and having superposed thereon a compensation AC voltage with an opposite phase to an AC voltage induced in the charger by the developing bias is applied to the charger.

Abstract translation: 图像形成装置具有图像载体，充电器，显影装置，电压施加单元和控制器。 显影装置包括显影辊。 电压施加单元向显影辊和充电器施加电压。 控制器控制电压施加单元。 控制器控制电压施加单元，使得具有叠加在DC电压上的AC电压的显影偏压被施加到显影辊，并且包括至少包括DC电压并且在其上叠加有相反相位的补偿AC电压的充电偏压 通过显影偏压在充电器中感应的AC电压被施加到充电器。