Image forming apparatus, charging roller, production method of charging roller, production apparatus of charging roller
AssigneeSharp Kabushiki Kaisha
InventorToshiaki Kagawa
Life of this patent
Estimating the term…
Abstract
A contact angle of water on the surface of a charging roller is equal to or smaller than a contact angle of water on the surface of the photo conductor. This structure prevents slip of the charging roller in an image forming apparatus wherein the charging roller is rotated due to the driving force of the photo conductor which is transmitted from the photo conductor as the charging roller comes in contact with the surface of the photo conductor.
Claims20
An image forming apparatus, comprising:
- an image carrier for carrying an electrostatic latent image;
- and
- a charging roller which rotates in contact with a surface of the image carrier by transmission of a rotation force of the image carrier, wherein a contact angle of water on a surface of the charging roller is equal to or smaller than 0.87 times a contact angle of water on the surface of the image carrier.
A charging roller for charging an image carrier by coming in contact with a surface of the image carrier, wherein a contact angle of water on a surface of the charging roller is equal to or smaller than 0.87 times a contact angle of water on the surface of the image carrier.
A method of producing a charging roller for charging an image carrier by coming in contact with a surface of the image carrier, the method comprising the step of:
- (a) processing a surface of the charging roller by corona discharge treatment so that a contact angle of water on a surface of the charging roller is equal to or smaller than 0.87 times a contact angle of water on a surface of the image carrier.
A production apparatus for making a charging roller which charges an image carrier by coming in contact with a surface of the image carrier, the production apparatus comprising:
- a retention section for holding a charging roller, the retention section comprising a plurality of roller members having parallel axes for rotating a charging roller, wherein a charging roller is placed on and in contact with an adjacent pair of the roller members;
- and
- a discharge section for generating corona discharge to the charging roller retained by the retention section.
A production apparatus for making a charging roller which charges an image carrier by coming in contact with a surface of the image carrier, the production apparatus comprising:
- a retention section for retaining a charging roller, wherein the retention section includes chain-shaped or belt-shaped endless members that incorporate a plurality of roller members, the endless members being respectively provided near opposite ends of the charging roller, and wherein the opposite ends of the charging roller are placed on adjacent pairs of the rollers on the endless members;
- a discharge section for generating corona discharge to the charging roller retained by the retention section;
- and
- a carriage section for carrying the charging roller retained by the retention section so that the charging roller passes through a region opposite to the discharge section, the carriage section including a plurality of supporting members for suspending the endless members, and a rotation drive section for rotating at least one of the supporting members.
Dependencies are inferred from the claim text.