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US 6,647,225 B2Granted
Charging device for frictionally-charging an image bearing member and image forming apparatus including same
AssigneeCanon Kabushiki Kaisha
InventorTomomi Kakeshita
Life of this patent
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Abstract
A charging device includes a charging rotary member provided in contact with an image bearing member capable of bearing a toner for charging the image bearing member, in which a peripheral speed of the charging rotary member is different from a peripheral speed of the image bearing member, and the charging rotary member includes a surface layer frictionally charging the toner to a normal charging polarity.
Claims25
A charging device comprising:
- a charging rotary member provided in contact with an image bearing member, which can bear toner, for charging the image bearing member, a peripheral speed of the charging rotary member being different from a peripheral speed of the image bearing member,
- wherein a rotating direction of the charging rotary member is the same as a rotating direction of the image bearing member in a contact position of the charging rotary member and the image bearing member, and
- wherein the charging rotary member includes a surface layer frictionally charging the toner to a normal charging polarity of the toner.
An image forming apparatus comprising:
- an image bearing member, which can bear toner;
- and
- a charging rotary member provided in contact with the image bearing member, for charging the image bearing member, a peripheral speed of the charging rotary member being different from a peripheral speed of the image bearing member,
- wherein a rotating direction of the charging rotary member is the same as a rotating direction of the image bearing member in a contact position of the charging rotary member and the image bearing member, and
- wherein the charging rotary member includes a surface layer frictionally charging the toner to a normal charging polarity of the toner.
2 more elements
Dependencies are inferred from the claim text.