Patent ID: 8811854

Claim:
A developing apparatus comprising; a developing container for accommodating developer including magnetic particles; a developer carrying member, rotatably provided in said developing container, for carrying the developer to a region where said developer carrying member is opposed to an image bearing member; a magnet, stationarily provided in said developer carrying member, having a pair of magnetic poles of the same polarity adjacent to each other in a circumferential direction of said developer carrying member; and a magnet seal member provided at each of opposite ends of said developer carrying member with respect to a longitudinal direction thereof, wherein said magnet seal member is extended along the circumferential direction of said developer carrying member in a region interposed between half-peak widths of said pair of magnetic poles and a region opposing the half-peak-widths, and wherein said magnet seal member has a surface opposing said developer carrying member, the surface being magnetized with only a polarity which is the same as the polarity of said pair of magnetic poles.