Patent ID: 8538294

Claim:
A charge-removing device comprising: a light source that emits light; and a light guide portion that confronts a surface of an image-bearing member, the light guide portion extending in a first direction, the light guide portion guiding light from the light source toward the surface of the image-bearing member, a charge on the surface of the image-bearing member being removed by the light emitted from the light guide portion; wherein the light guide portion includes: a first surface opposing the light source; a second surface that is an opposite surface of the first surface in the first direction; a confronting surface connecting the first surface and the second surface, the confronting surface confronting the surface of the image-bearing member in a second direction orthogonal to the first direction; and a rear surface that is an opposite surface of the confronting surface, the rear surface having a rough surface part that reflects, toward the confronting surface, the light entered from the first surface, the rough surface part having a length of a third direction orthogonal to the first direction and the second direction; wherein the rough surface part includes: an increasing portion; a decreasing portion; a first edge; a second edge opposing the first edge in the first direction and being closer to the second surface than the first edge, one edge of the increasing portion being coincident with the first edge; and a maximum portion and a minimum portion, the maximum portion having a constant maximum length of the rough surface part in the third direction, the minimum portion having a constant minimum length of the rough surface part in the third direction, wherein the closer a position of the increasing portion is to the second surface, the larger the length of the increasing portion in the third direction becomes, wherein the closer a position of the decreasing portion is to the second surface, the smaller the length of the decreasing portion in the third direction becomes, and wherein the increasing portion, the maximum portion, the decreasing portion, and the minimum portion are sequentially arranged in the first direction in this order.