Image forming device

Abstract

PURPOSE: To shorten time for checking a density and simultaneously, to reduce the number of forms and the quantity of toner, used for checking the density. CONSTITUTION: A CPU 5 changes over the reference value [light data (d)] of a monitor voltage supplied to a pulse width modulating control circuit 4 at each printing of one/fifth of a form, in five stages of A to E (A>B>C>D> E), to change the switching duty of a switching transistor 3, and varying a developing bias applied to a developing sleeve 1 from a high voltage transformer 2. Thus, the quantity of the toner stuck to an electrostatic latent image from a developing device is changed and a printing density is changed in five stages, with respect to a form sheet. COPYRIGHT: (C)1992,JPO&Japio

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