CHARGING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

摘要

To provide a charging device which can be reduced in size and increased in speed while suppressing the occurrence of charging irregularities on the surface of the photosensitive drum, a process cartridge, and an image forming apparatus. A charging device 311Y which charges a surface of a photosensitive drum 310Y, comprises a discharge electrode 610 which applies a potential to the surface of the photosensitive drum 310Y and charges the surface, and a grid electrode 670 with a porous place shape disposed between the discharge electrode 610 and the surface of the photosensitive drum 320Y so as to face the surface of the photosensitive drum 310Y and which controls the charging potential of the surface, wherein the grid electrode 670 is divided into a plurality of regions approximately parallel to a direction orthogonal to a direction of rotation of the photosensitive drum 310Y, and the plurality of regions is characterized in that an opening ratio of a midstream region 672 close to the photosensitive drum 310Y is greater than an opening ratios of an upstream region 671 and a downstream region 673.

主权项

1. A charging device which is disposed so as to face a surface of a photosensitive drum and which charges the surface of the photosensitive drum, comprising:
a discharge electrode, which carries out corona discharge, applies a voltage to the surface of the photosensitive drum and charges the surface, a grid electrode with a porous plate shape, which is disposed between the discharge electrode and the photosensitive drum so as to face the surface of the photosensitive drum and which controls a charging potential at the surface, wherein the grid electrode is divided into a plurality of regions in a direction along a direction of rotation of the photosensitive drum, and the plurality of regions is set such that an opening ratio of a region close to the photosensitive drum is greater than an opening ratio of another region.