Developer, and image forming apparatus and image forming method using the developer

摘要

A developer including a toner and a carrier, wherein the carrier is a ferrite carrier coated with a silicone resin and the following relationships are satisfied: log(&Dgr;Q(t)/Q∞)=−kobt &Dgr;Q(t)=Q∞−Q(t) −2.5 ≦̸log(kob)≦̸−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; Q∞ is a saturated charge quantity (μC/g) of the developer; and kob is a chargeable speed of the developer.