Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsSatoshi Tsuruya, Katsuhiro Sakaizawa, Jun Suzuki, Masaru Shimura
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide an image forming apparatus in which when a first area to be an image forming area of the image bearing member exists in said nip portion, a superimposed voltage resulting from a direct current voltage and an alternating voltage having a peak to peak voltage smaller than an alternating voltage applied when a charging potential of the image bearing member is converged is applied to the charging member, and wherein when a part of a second area to be a non-image area of the image bearing member exists in said nip portion, a direct current voltage without an alternating voltage is applied to the charging member.
Claims21
An image forming apparatus comprising:
- an image bearing member;
- a flexible charging member for forming a nip portion with said image bearing member and for charging said image bearing member, said nip portion being provided with a conductive particle;
- and
- developing means for developing an electrostatic image formed on said image bearing member with a developer, said developing means being capable of conducting collection operation for collecting a remaining developer on said image bearing member;
- wherein when a first area to be an image forming area of said image bearing member exists in said nip portion, a superimposed voltage resulting from a direct current voltage and an alternating voltage having a peak to peak voltage smaller than an alternating voltage applied when a charging potential of said image bearing member is converged is applied to said charging member, and
- wherein when a part of a second area to be a non-image area of said image bearing member exists in said nip portion, a direct current voltage without an alternating voltage is applied to said charging member.
Dependencies are inferred from the claim text.