| 摘要 |
A developer used in an image forming apparatus, the developer containing: a toner, and a carrier that charges the toner, the toner containing a core toner, and an external additive that is added to a surface of the core toner, the core toner containing a colorant, a binder resin, a releasing agent, and a charge controlling agent containing Al and Mg, an amount of the charge controlling agent on the surface of the core toner being from 0.2 to 4.0 cps/eV in terms of a Mg amount measured by EDX, the core toner having a circularity of from 0.880 to 0.930, the external additive having a primary particle diameter of from 70 to 200 nm, an amount of the external additive being from 0.2 to 3.0% by weight based on the core toner.
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