| 摘要 |
PURPOSE:To always obtain a good copy with a good exposure quantity, by varying almost proportionally exposure light source voltage and an exposure quantity display value corresponding to a variation of said voltage. CONSTITUTION:To an exposure quantity adjusting knob 547, a three-throw variable resistor 631 which has interlocked variable resistors 631a, 631b and 631c is directly coupled. When the variable resistor 631a turns clockwise, its resistance value becomes small, and when the variable resistor 631b turns clockwise, its resistance value becomes large, and when the exposure quantity adjusting knob 547 is turned clockwise by combining both the resistors 631a, 631b, the resistance value becomes small. A lamp regulator 632 is an electric power supply for applying the voltage to a light source lamp 5, and controls the applied voltage by feeding back the applied voltage to the lamp regulator 632. |
