| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an original illumination device capable of easily correcting the deviation of an illuminance distribution in a target irradiation area from the outside of the original illumination device, with a simple configuration and to provide a scan optical unit, an image reading device, and an image forming apparatus. <P>SOLUTION: An original illumination part 56 includes a shield member 42 including an opposite surface 42a to which a reflecting part 48 is attached and a lower surface 42b constituting the outer surface of the original illumination part 56 and a cover member 43 including an opposite surface 43b to which a reflecting part 47 is attached and an upper surface 43c constituting the outer surface of the original illumination part 56. The original illumination part 56 is configured so that a light diffusion sheet 81 is fixed to the upper surface 43c and the engagement projection 81b of the light diffusion sheet 81 is engaged with the hole 42c of the shield member 42. The original illumination part 56 includes an adjustment part 70 which can adust the fixing position of the light diffusion sheet 81 and the adjustment part 70 comprises a through-hole 81d formed in the light diffusion sheet 81 and a long groove 43d formed in the upper surface 43c. <P>COPYRIGHT: (C)2013,JPO&INPIT |
