Patent ID: 7855042

Claim:
A developer, comprising at least: toner particles each containing at least a binder resin; and a composite inorganic fine powder, wherein: the composite inorganic fine powder is a composite integrally formed from strontium titanate, strontium carbonate and titanium oxide, and has a peak at a Bragg angle (2θ±0.20 deg) of 32.20 deg originating from strontium titanate, 25.80 deg originating from strontium carbonate, and 27.50 deg originating from titanium oxide in a CuKα characteristic X-ray diffraction pattern; and a half width of the X-ray diffraction peak at a Bragg angle (2θ±0.20 deg) of 32.20 deg is 0.20 to 0.30 deg, wherein an intensity level (Ia) of the peak of 32.20 deg, an intensity level (Ib) of the peak of 25.80 deg and an intensity level (Ic) of the peak of 27.50 deg satisfy the following formulae: 0.010<( Ib )/( Ia )<0.150 and 0.010<( Ic )/( Ia )<0.150.