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：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.