Patent ID: 8532538

Claim:
A developing device comprising: a developer carrying member; a first feeding path in which a developer is to be supplied and fed to said developer carrying member at a position in which said first feeding path opposes said developer carrying member; a second feeding path, communicating with said first feeding path, for forming a circulation path with said first feeding path; a discharge opening for permitting discharge of an excessive developer in said developing device; a first supply opening, located downstream of said first feeding path opposing said developer carrying member with respect to a developer feeding direction and located upstream of said discharge opening with respect to the developer feeding direction, for permitting supply of a first developer containing at least toner; and a second supply opening, located upstream of said first feeding path with respect to the developer feeding direction and located downstream of said discharge opening with respect to the developer feeding direction, for permitting supply of a second developer which has a toner ratio lower than a toner ratio of the first developer or is consisting only of a carrier.