| 摘要 |
PROBLEM TO BE SOLVED: To output a high-quality color image at high speed even in the case of using a multiple developing batch transfer method. SOLUTION: 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 εt 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, εo is a vacuum dielectric constant, h is a Planck's constant, ve is the absorption frequency of the toner. |
