| 摘要 |
PURPOSE:To prevent an exposing means from flickering and having voltage variation by connecting a resistance to a power supply and turning a fixing means when the exposing means is in operation. CONSTITUTION:A controller 30 functions as the power supply which supplies electric power to a fixing lamp 21 and an exposure light source and a semiconductor switch 39 which is connected to the exposure light source 4 through a resistance 35, an exposure switch (including resistances R1-R3) 36 is connected to a fixing lamp driving circuit SSR 34. When an original platen moves by specific size, an original platen position detection switch 33 is turned on sand then while the exposure light source 4 illuminates at the same time, the controller 30 inhibits the fixing lamp 21 from being supplied with the electricity. Consequently, variation in source voltage due to the fixing lamp 21 is precluded and the supply voltage to the exposure light source 4 is stabilized. |
