| 摘要 |
PROBLEM TO BE SOLVED: To reduce transfer color slurring by providing a first supporting body which is used in common for plural photoreceptors, and a second supporting body having a coefficient of thermal expansion smaller than that of the first supporting body. SOLUTION: The frame 4 of the photoreceptor 1 is separated from the frame 6 of a scanning exposure device. That is, this device is provided with the frame 4 which rotatably supports the plural photoreceptors 1 and which is used in common for the plural photoreceptors 1, and the frame 6 which supports at least plural constituting parts among members constituting an exposing means, which is in common with the plural constituting parts, and whose coefficient of thermal expansion is smaller than that of the frame 4. In the case, as to the frame 6 whose temperature change, such material whose coefficient of thermal expansion is small as steel is assembled to be used; and as to the frame 4 whose temperature change is small, resin, etc., whose coefficient of thermal expansion is comparatively large can be used. For example, the coefficient of thermal expansion of the frame 6 connecting each canning exposure device each other is nearly half of that of the frame 4 connecting each photoreceptor each other. |
