To output a high-quality color image at high speed even in the case of using a multiple developing batch transfer method.
As for previous color toner existing in a non-exposure area when entire electrification is performed after developing a previous color toner image, and then exposure is selectively performed in an area where a next color toner image is formed; force acting on the previous color toner in a state where the previous color toner exists in an area proximate to the exposure area and does not exist in the proximate exposure area is set to satisfy a specified conditional expression by adjusting at least one or more of following values when it is assumed that electrified amount per one particle of the previous color toner is q, a difference between the surface potential (Vo) of the toner at the time of entire electrification and the surface potential (VL) of a selective exposure part is ΔM the radius of the particle of the previous color toner is R, a distance (distance between surfaces) between the particles of the previous color toner is D, the relative dielectric constant and the refractive index of the previous color toner are t and nt, respectively, the relative dielectric constant and the refractive index of the medium in which the previous color toner exists are δm and nm, k is a Boltzmann's constant, T is absolute temperature, o is a vacuum dielectric constant, h is a Planck's constant, ve is the absorption frequency of the toner.
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TAKASU ISAO