Patent ID: 7369799

Claim:
A developing cartridge attachable to and detachable from an image forming apparatus that forms an image on a recording medium, the developing cartridge comprising: a developer agent chamber that stores a developer agent of a nonmagnetic single component; a developer agent carrier that supplies the developer agent to an electrostatic latent image formed on an image carrier provided in the image forming apparatus; and a layer thickness restricting member that has a contact portion that elastically contacts with the developer agent carrier and restricts a layer thickness of the developer agent carried on the developer agent carrier, wherein the contact portion includes a first layer that contacts with the developer agent carrier and a second layer covered by the first layer, the second layer being configured to be exposed by wearing of the first layer in accordance with rotation of the developer agent carrier and to be contacted with the developer agent carrier, wherein the first layer is configured to charge the developer agent by a friction when the developer agent passes between the first layer and the developer agent carrier, and wherein the second layer is configured to cause the developer agent into a failure in charging when the developer agent passes between the second layer and the developing agent carrier.