Charging device and image forming apparatus
AssigneeSharp Kabushiki Kaisha
InventorTakashi HORI
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Abstract
There is provided a charging device having high durability, of which controllability of charged potential of a photoreceptor is hardly impaired even with a some amount of contaminants such as a toner so that control of charged potential of a photoreceptor can be stably carried out to fall in an appropriate range over a long period of time, and moreover which is inexpensive. As a grid electrode, one prepared by forming a composite plated layer composed of three layers of an Sn plated layer, an Sn—Co plated layer and a Ni plated layer is used. More preferably, an upper layer is an Sn plated layer, an intermediate layer is an Sn—Co plated layer and a lower layer is a Ni plated layer.
Claims4
A charging device to be mounted in an electrophotographic image forming apparatus including a photoreceptor, so as to face a surface of the photoreceptor, comprising:
- a charging electrode for charging the surface of the photoreceptor by applying a voltage to the charging electrode, and
- a grid electrode disposed between the charging electrode and the photoreceptor, including a porous plate-like substrate and a composite plated layer formed on a part or a whole of a surface of the porous plate-like substrate,
- wherein the composite plated layer is composed of three layers of an Sn plated layer, an Sn—Co plated layer and a Ni plated layer.
Dependencies are inferred from the claim text.