| 摘要 |
PURPOSE:To uniformize the whole light quantity of an LED array, to reduce a manufacturing man-hour, to prolong the life of an LED and to obtain high image quality having stable toner concentration without fogging by automatically adjusting the individual light emitting characteristic of the LED as for a destaticization device for a copying machine in an electrophotographic copying machine constituted of the LED array which is arranged on the circumferential surface of a photosensitive drum being the carrier of an electrostatic image and set for exposing and eliminating the unnecessary image part of the surface of the photosensitive drum. CONSTITUTION:By providing a photodetector according to the respective LEDs of the LED array, setting a reference value to the output signal of the photodetector and executing feedback for the driving system of the LED so as to always control the driving current of the LED based on the reference value, the uniform distribution of the whole light quantity of the LED array and the stable light quantity are automatically obtained even if variation exists in the light emitting characteristic. |
