| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device capable of obtaining an excellent output image by preventing the output image quality from lowering in consequence of the temp. rising, even though successively carrying out the image output with high speed. SOLUTION: In this image forming device 4 provided with a developing vessel (developer containing means) 41 containing the powdered developer, a developing sleeve (developer carrying means) 42 in a roller shape supported by the developing vessel 41 freely rotatably, for carrying the developer on its surface, and a doctor blade (developer layer controlling member) 43, the device is provided with a first heat radiating means 49 equipped with a fin 49a on an end part of the developing sleeve 42. |
