| 摘要 |
In an image reading apparatus, an image is illuminated to be guided as a light beam to a photosensitive drum through an image forming lens. Light amount correcting members are attached to a movable member movably attached relatively to the image forming lens. The movable member moves in the optical axis direction in accordance with movement of the image forming lens, and one of the light amount correcting members farther from the image forming lens is caused to face a corresponding surface of the image forming lens so as to intercept a part of the light beam from the image in association with the movement of the movable member. The other of the light amount correcting members closer to the image forming lens is caused to retract from a corresponding surface of the image forming lens in association with the movement of the movable member.
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