Developing device and image forming apparatus including the same

摘要

A developing device (100) includes a housing (101) containing toner having an opening (10) at a side thereof, a developing roller (3) supplying the toner supplied through the opening to a photoconductive drum (1), and a regulator (6) contacting the outer circumference of the developing roller to regulate the amount of the toner supplied to the photoconductive drum. The housing also includes a lower frame (60) having both side portions (61,62) and a lower end portion (660) respectively forming both edges and a lower edge of the opening in a lengthwise direction, and an upper frame (80) welded and coupled to the lower frame and including a leading end portion (810) forming an upper edge of the opening and a recess portion (820) recessed from the leading end portion at both end portions of the leading end portion in the lengthwise direction. Both side portions of the lower frame includes a first surface (611) contacting the recess portion to prevent the upper frame from being pushed toward the developing roller when the upper frame is welded and coupled to the lower frame.