Electrostatic image forming apparatus with charge controller

Abstract

The following is in reference to the electrostatic copying machine with image formation apparatus using the photo conductor. The invention is to compute the electrifier voltage that is able to get the desired charge at the developing section by detecting the charge capacity and potential falling amount in order to correct the change in charge amount affected by the potential falling. The invention is that the correction can be made even in the course of continuous processing and in order not to be affected by the aged deterioration of the photo conductor, memorize the voltage per photo conductor temperature after the correction of the processed number of sheets and renew the memory value with the latest data. The invention is that the degree of the potential falling by the temperature of photo conductor is affected by the quantity of light irradiated on the photo conductor--to change the degree of correction of potential falling in proportion to the temperature of the photo conductor. And, the invention is that the charge capacity is detected timely and that a memory to store the relation between the photo condcutor temperature and the potential falling characteristics is equipped, in order not to be affected by the aged deterioration of the photo conductor and the temperature dependability of the potential falling.