| 摘要 |
PROBLEM TO BE SOLVED: To make quickly and thermally processible a photosensitive material by miniaturizing an image forming device by making the heating drum of the image forming device small-sized and excellently balanced. SOLUTION: A long photosensitive material 50 is cut into a specified length, and each photosensitive material piece 50A is successively made in parallel in a width direction. Heating processing is executed while winding and rotating each photosensitive material piece 50A in a parallel state on the wide outer peripheral surface 62 of the heating drum 60. Since the heating drum 60 may process each photosensitive material piece 50A which is short, it is formed into a shape by which it is made small-sized, long in an axial direction and excellently balanced, so that the image forming device to which it is attached can be miniaturized.
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