| 摘要 |
PURPOSE:To absorb heat rays and to prevent materials of members from overheating by arranging an optical filter which absorbs infrared rays close to visible light well between a lamp and an original surface, and correcting drum sensitivity. CONSTITUTION:A main reflecting mirror 2 having an elliptic surface is arranged around the lamp 1 and reflected light from the main reflecting mirror 2 illuminates a slit part 5 on the original surface 4 through a subordinate reflecting mirror 3. Luminous flux emitted from the lamp 1, while reflected by the main reflecting mirror 2 to converge, travels to the subordinate reflecting mirror 3 and is further reflected by the subordinate reflecting mirror 3 to form an image in front of the original surface 4, thereby illuminating the slit part 5 of the original surface 4 in the form of divergent luminous flux. The optical filter 6 which absorbs infrared rays and makes color correction is arranged between the main reflecting mirror 2 and subordinate reflecting mirror 3 slantingly to the optical axis connecting both reflecting mirrors together. |
