| 摘要 |
A line source unit with a uniform light generation characteristic and an image input apparatus are provided. In the line source unit, only defective element(s) can be replaced. Light enters at the side portion of a light guiding member which is transparent and placed within a cover, and travels within the light guiding member undergoing total reflection. The light is then released to the outside of the member by reflecting the light at a light diffusing portion formed on a part of the light guiding member. Inner part of the cover which closely contacts with the light guiding member is partly black in color, within a predetermined range from light generation elements. With this construction, the line source unit provides a uniform light amount.
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