| 摘要 |
PURPOSE:To obtain copy images which are stable all the time including the beginning by checking the illuminance distribution of exposure lamps every time a power switch is turned on and setting applied voltage to the respective lamps. CONSTITUTION:When the power switch of a copying machine is turned on, voltages VA-VC of 50Vrms are applied to the lamps 2a-2c uniformly through a power unit 19 and a lamp regulator 18. The outputs of sensors 16a-16c are compared with data DA-DC stored in the ROM is a CPU 17 after a timer T1 counts 0.5 second. For example, when the value DA is neither smaller than nor equal to the output value of the sensor 16a, a signal indicating that is inputted to the lamp regulator 18, which increases the voltage applied to the corresponding lamp by +1V at every time until the output of the sensor 16a coincides with the DA. |
