Image formation apparatus and method for clear character and smooth image reproduction

摘要

A photosensitive body, charge device, and exposure device are adjusted so as to satisfy relations 0.3<E2/E1<1.3 and 0.2<E1/E0<0.6 wherein a charge potential of the photosensitive body charged by the charge device is VH, a saturated surface potential of light attenuation of the photosensitive body is VL, an energy setup value of a light beam is E0, a light energy width of a dead area in which the surface potential of the photosensitive body remains in a potential less than or equal to VH and greater than or equal to VH-(VH-VL)/5 is E1, and a light energy width of a responsive area in which the surface potential of the photosensitive body remains in a potential less than or equal to VH-(VH-VL)/5 and greater than or equal to VL+(VH-VL)/5 is E2.