Electrophotographic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTsuyoshi Shimada, Kan Tanabe, Haruhiko Mitsuda
Life of this patent
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Abstract
An electrophotographic apparatus includes an electrophotographic photosensitive member, a charging roller disposed so as to come into contact with the electrophotographic photosensitive member, and a charging device operable to apply only a DC voltage to charge the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a support member, an undercoat layer over the support member, and a photosensitive layer over the undercoat layer and having a plurality of discrete recesses in the surface thereof. The undercoat layer contains zinc oxide particles and a binder resin. The undercoat layer has cavities therein, and the cavities account for 5.00% or less of the volume of the undercoat layer.
Claims5
An electrophotographic apparatus comprising:
- an electrophotographic photosensitive member having discrete recesses in the surface thereof;
- a charging roller disposed so as to come into contact with the electrophotographic photosensitive member;
- and
- a charging device operable to apply only a DC voltage to the charging roller so as to electrically charge the electrophotographic photosensitive member,
- wherein the electrophotographic photosensitive member includes:
- a support member,
- an undercoat layer over the support member, and
- a photosensitive layer over the undercoat layer,
- wherein the undercoat layer contains zinc oxide particles and a binder resin, and the undercoat layer has cavities therein, the cavities accounting for 5.00% or less of the volume of the undercoat layer, and
- wherein the undercoat layer has thickness of 25.0 μm or more, and wherein a volume average particle size of the zinc oxide particles is 30 nm or more and 50 nm or less.
Dependencies are inferred from the claim text.