| 摘要 |
PURPOSE:To provide an image forming device which can form an image whose density is well balanced while it follows the change of an environment by simple constitution. CONSTITUTION:Water content absorbed by toner as developer is inferred based on an environment sensor (environment detection means) 19 as a humidity sensor and the leaving time thereof. Then, a degree belonging to a fuzzy set based on respective detection quantity is obtained and the fuzzy sets of contrast voltages corresponding to the respective degrees are detected. Besides, the area of the detected fuzzy sets of the constrast voltages is composed and is regarded as the obtaining contrast voltage which determine the position of the center of the gravity there of. |
