Charging unit and discharging unit

摘要

A charging and/or discharging unit for an image formation device may include a discharge wire extending in a lateral direction (a second direction) perpendicular to a first direction, the first direction corresponding to a moving direction of the surface of a photosensitive drum and parallel to the surface of the photosensitive drum. The discharge wire may be distanced from the surface of the photosensitive drum. Shield electrodes and a grid electrode are opposed to the discharge wire, with a distance therefrom and extending along the lateral direction. The shield electrodes and the grid electrode may include ribs extending in the lateral direction, respectively. In one or more examples, the ribs may correspond to recessed portions in a surface of the corresponding electrodes and may be located out of a specified circular area.

主权项

1. A charging unit configured to charge a surface of an image bearing member moving in a first direction, the charging unit comprising:
a discharge electrode extending in a second direction perpendicular to the first direction and parallel to the surface of the image bearing member, wherein the discharge electrode is spaced apart from the surface of the image bearing member; a first shield electrode; and a second shield electrode disposed opposite to the first shield electrode, a surface of the second shield electrode including a first recessed portion and a first non-recessed portion, the first recessed portion being formed by at least two bends in the surface of the second shield electrode, wherein one of the first shield electrode and the second shield electrode is located at an upstream side of the discharge electrode in the first direction, and the other one of the first shield electrode and the second shield electrode is located at a downstream side of the discharge electrode in the first direction, and wherein a length of the first recessed portion in the second direction is less than an entire length of the second shield electrode in the second direction, the first recessed portion being enclosed by the first non-recessed portion at both ends in the second direction.