| 摘要 |
PURPOSE: A method and a device for correcting voltage variation owing to power change or system variation on an image forming system are provided to accurately control an image concentration or high voltage output by correcting the voltage variation owing to the power change or the system variation for measurement of an analog value to control the image concentration or the high voltage output. CONSTITUTION: An image concentration detector(350) detects the image concentration. A variation corrector(370) calculates the variation by comparing the first supply power voltage of the image concentration detector with the first reference value, corrects the detected image concentration by applying a correction value, and digitalizes/provides it to an engine controller(330). An environment detection value measurer(360) measures a roll resistance value for detecting environment. The variation corrector calculates the variation by comparing the second supply power voltage of the environment detection value measurer with the second reference value, corrects the roll resistance value by applying the correction value, and digitalizes/provides it to the engine controller.
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