Developer comprising toner and/or carrier having specified average degree of roundness and specified standard deviation of degree of roundness

摘要

The present invention relates to developer comprising a toner and/or a carrier; the toner comprising: toner particles comprising colored resin-particles containing at least a binder resin and a colorant, and inorganic fine particles fixed on the surface of the colored resin-particles, the toner particles having an average degree of roundness of not less than 0.960 and a standard deviation of degree of roundness of not more than 0.040; and carrier having an average degree of roundness of not less than 0.940 and a standard deviation of degree of roundness of not more than 0.055.