| 摘要 |
PURPOSE:To execute an optimum copy corresponding to a copying document by constituting the title controller so that the exposure quantity at the time of copying can be changed stepwise by a change rate set separately. CONSTITUTION:The title controller is constituted so that the exposure quantity at the time of copying can be changed stepwise by the change rate set separately. That is, when an exposure lamp 1 is lighted, a terminal voltage is detected by a feedback transformer 25 and the corresponding DC effective voltage is obtained by a waveform shaping circuit 27, and a trigger pulse generating circuit 7 controls the electric conduction angle of a triac 3 so that a difference voltage from a differential amplifier 9 becomes zero. In such a way, the exposure quantity corresponding to an exposure step can be setting-changed separately, various adjustments corresponding to the kind of form of the document or a color document, etc., can be executed, and optimum copying is possible. |
