| 摘要 |
PURPOSE:To always obtain an excellent formed image by detecting environment, humidity, etc., with the aid of the high voltage current of a high voltage transformer, and automatically correcting the original luminous energy of an image forming device. CONSTITUTION:In terms of correction of luminous energy not under the highly humid environment, a current if flowed in a resistance A19, whereby the input voltage 23 of a lamp regulator R is dropped. Under the highly humid environment, an operating signal 22 from the microcomputer MC of a DC controller C is outputted to a transistor A21 with the aid of a humidity detecting signal 10, and accordingly the titled device operates so that a current is also flowed in a resistance B20 as well as the resistance A19. The titled device is so constituted that the voltage drop of the input voltage 23 to the lamp regulator R can be larger than the device is not under the highly humid environment. In order for the input voltage 23 of the lamp regulator R to raised slowly from such a state so as to increase the lamp luminous energy, a time constant circuit composed of a resistance 13 and a capacitor 14 is provided. |
