Patent ID: 8153342

Claim:
A one-component developer for a cleanerless image forming apparatus, said developer comprising a mixture of a toner and a carrier, wherein the carrier is a ferrite carrier coated with a silicone resin, wherein the toner includes a charge controlling agent to control a chargeable speed k ob of the developer, the charge controlling agent including at least one of a triphenylmethane dye, a metal complex dye comprising chromium, a chelate compound of molybdic acid, a rhodamine dye, an alkoxyamine substance, an alkylamide substance, a compound containing phosphor and a compound containing sulphur, and wherein the developer has a property of chargeable speed k ob satisfying the following conditions: log(Δ Q ( t )/ Q ∞ )=− k ob t Δ Q ( t )= Q ∞ −Q ( t ) −2.5≦log( k ob )≦−1 wherein Q(t) is a charge quantity (μC/g) of the developer after t sec which is a stirring time of the toner and the carrier to form the mixture; Q ∞ is a saturated charge quantity (μC/g) of the developer.