method for developing product of latent images

摘要

PURPOSE:To prevent the uneven developing from being generated, by taking the period of beat of a developing force peak value caused from the superimposition between a revolution of a magnetic roller and an AC development bias as less than a substantial development time. CONSTITUTION:A rotating magnetic roller 2 is provided in a developing sleeve 1. The number of revolutions of the magnetic roll and the frequency of an AC developing bias are set so that the beat of a developing peak value caused from the change and superimposition of the magnetic and electric operations is less than a substantial developing time (a time when a point on the surface of an electrostatic latent image carrier passes through a developing possible region actually developed), e.g., 1,400rpm and 560Hz. The unevenness of the number of revolutions of the magnetic roll is detected with a magnetic force change detecting element 8 beneath a sleeve end, a control circuit 9 controls the frequency of the AC bias and the shift in setting can be prevented.