| 摘要 |
This invention has as its object to provide an illumination device which has excellent performance and characteristics, and can attain a cost reduction, size reduction, and the like, an image sensor having the illumination device, and an image reading apparatus and information processing system using the image sensor. To achieve this object, the illumination device has a light source and a light guide member having an entrance surface for receiving light coming from the light source, an exit surface for outputting light in an illumination direction, and a diffusion region for reflecting and/or diffusing an incoming light beam across the longitudinal direction.
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