Patent ID: 7421225

Claim:
An image forming apparatus comprising: a main casing; and a developing cartridge detachably mountable to the main casing in a first direction wherein the developing cartridge further comprises: a housing that accommodates a developer therein; a developing roller including a developer roller shaft rotatably supported by the housing; and a conductive member provided with the housing, the conductive member including a first contact member and a second contact member, the second contact member being electrically connected to the developing roller shaft and the first contact member, the first contact member being movable in a second direction from outside the housing toward interior of the housing, the second direction being generally orthogonal to the first direction, the first contact member being positioned on a trailing side from the second contact member with respect to the first direction, the main casing further comprises: a wall that defines a cartridge mounting area where the developing cartridge is mounted, the wall including a slide surface; and a bias electrode located adjacent the slide surface, the bias electrode being electrically connected to a power source; wherein the first contact member contacts the bias electrode when the developing cartridge is mounted in the cartridge mounting area.