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公开(公告)号：US11067923B2
公开(公告)日：2021-07-20
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
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.
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公开(公告)号：US11143979B2
公开(公告)日：2021-10-12
申请号：US17098406
申请日：2020-11-15
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu Shimizu , Mitsuhiro Hashimoto , Takahiro Okubo , Yohei Wakasa , Kazuhiro Nakachi
IPC: G03G15/06
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. A developing device has a developer carrier that carries a two-component developer including a magnetic carrier and toner. A developing voltage power supply applies a developing voltage obtained by superimposing an AC voltage on a DC voltage on the developer carrier. A control unit estimates a toner charge amount based on a toner current calculated by subtracting a carrier current from a developing current detected by a current detecting unit when a reference image is formed during non-image formation, and a toner developing amount calculated from the density of a reference image detected by a density detecting device.
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公开(公告)号：US20210149321A1
公开(公告)日：2021-05-20
申请号：US17098406
申请日：2020-11-15
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu Shimizu , Mitsuhiro Hashimoto , Takahiro Okubo , Yohei Wakasa , Kazuhiro Nakachi
IPC: G03G15/06
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. A developing device has a developer carrier that carries a two-component developer including a magnetic carrier and toner. A developing voltage power supply applies a developing voltage obtained by superimposing an AC voltage on a DC voltage on the developer carrier. A control unit estimates a toner charge amount based on a toner current calculated by subtracting a carrier current from a developing current detected by a current detecting unit when a reference image is formed during non-image formation, and a toner developing amount calculated from the density of a reference image detected by a density detecting device.
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公开(公告)号：US10996585B2
公开(公告)日：2021-05-04
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
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.
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