公开(公告)号：US20180284651A1

公开(公告)日：2018-10-04

申请号：US15894639

申请日：2018-02-12

Applicant: KYOCERA Document Solutions Inc.

Inventor： Satoshi SUNAYAMA

IPC: G03G21/00

CPC classification number: G03G15/0898 ,  G03G15/0865 ,  G03G15/0891 ,  G03G15/0893 ,  G03G21/206

Abstract: An image forming apparatus includes an image carrier, a developing device, a detecting device and a vibration imparting device. The image carrier rotates around an axis. The developing device includes a developing member rotating around an axis at a position facing the image carrier and supplying a toner to the image carrier. The detecting device detects a number of the toner scattered from an inside to an outside of the developing device. The vibration imparting device imparts vibration to the toner accumulated near the developing member when the number of the toner detected by the detecting device satisfies a predetermined condition.

公开(公告)号：US20200026219A1

公开(公告)日：2020-01-23

申请号：US16510255

申请日：2019-07-12

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kazuhiro NAKACHI ,  Satoshi SUNAYAMA

IPC: G03G15/08

Abstract: A mode control section forms a plurality of reference toner images having different densities on a photosensitive drum, where the frequency of an alternating-current voltage of a development bias is varied with a potential difference between direct-current voltages of a development roller and the photosensitive drum maintained constant, generates a reference straight line indicating a relationship between a toner amount of each reference toner image obtained by converting the density of the measured reference toner image into weight, and a representative value of current values of a development current measured during formation of the reference toner image, and acquires the amount of electrostatic charge of toner using the reference straight line.

公开(公告)号：US20200233333A1

公开(公告)日：2020-07-23

申请号：US16745027

申请日：2020-01-16

Applicant: KYOCERA Document Solutions Inc.

Inventor： Satoshi SUNAYAMA ,  Shizuya UEMURA ,  Takashi INOUE

IPC: G03G15/06

Abstract: An image forming apparatus includes a photosensitive drum, a developing section, a voltage applicator, a detector, a calculating section, and an evaluating section. The detector detects values of first and second currents. The first current flows between the photosensitive drum and the developing section during formation of an electrostatic latent image. The second current flows between the photosensitive drum and the developing section when the electrostatic latent image is not being formed. The calculating section calculates a toner charge-to-mass ratio. The evaluating section evaluates reliability of a calculation result of the toner charge-to-mass ratio by comparing the second current value to a reference value. The reference value is of a reference current flowing between the photosensitive drum and the developing section when the electrostatic latent image is not being formed, and indicates a current value detected after adjustment to at least one of the photosensitive drum and the developing section.