Patent ID: 8032042
Filing Date: 2011-10-04
Classification: G03G

Abstract:
1. A developing bias control device that controls developing bias voltage by a square-wave signal having a first level, a second level and a third level between said first and second levels, said developing bias control device comprising: a first square-wave signal output unit that outputs a first square-wave signal instructing output of said first and second levels; a second square-wave signal output unit that outputs a second square-wave signal instructing output of said third level, the instruction of said second square-wave signal having higher priority than that of said first square-wave signal; and a control unit that controls said first and second square-wave signal output units so as to advance a rising edge of said second square-wave signal with respect to a rising edge of said first square-wave signal when the rising edge of said first square-wave signal coincides with the rising edge of said second square-wave signal, and to delay a falling edge of said second square-wave signal with respect to a falling edge of said first square-wave signal when the falling edge of said first square-wave signal coincides with the falling edge of said second square-wave signal.