IMAGE FORMATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an image formation apparatus capable of obtaining a satisfactory image without stripe unevenness even if an electrophotographic process changes by an environmental change, a temporal change or the like.SOLUTION: An image formation apparatus comprises: an exposure device that includes a plurality of light-emitting elements and a plurality of lenses collecting light from the light-emitting elements in a main scan direction, and forming an electrostatic latent image by irradiating a charged image carrier with the light; and a developing device to which a developing bias according to a developing property is applied so as to make constant a quantity of toner supplied to the electrostatic latent image. A charging bias applied to a charging device is controlled so as to be interlocked with a change in the developing bias. A light quantity of the developing device is controlled on the basis of a surface potential of the image carrier charged with the charging bias in a range satisfying 1≤E0≤3.0 and E0×0.8≤E1≤E0×1.2, while it is assumed that a preset light quantity is E0 times as large as a half exposure quantity at the surface potential serving as a reference potential of the image carrier, and the light quantity changing so as to be interlocked with the changed developing bias and the surface potential is E1 times as large as the half exposure quantity at the changed surface potential.