| 摘要 |
PURPOSE:To restrain variations in the discharge amount by controlling the value of a current fed to a discharge heater. CONSTITUTION:In a constitution where 8 groups of discharge heaters h1 to h64 are driven separately, using common signals COM 1 to COM 8 and segment signals SEG1 to SEG8, a reference voltage value of a constant current circuit 1404 corresponding to each of the common signals is preset, and a applicable reference voltage value is supplied through a D-A converter 1402 when each of the common signals is on. Thus optimal current values can be set for each of the heaters h1 to h64. |
