| 摘要 |
A scanning optical apparatus including a rotatable polygon mirror for deflecting laser light flux with equal angular velocity, an f lens for compensating the laser light flux deflected by the rotatable polygon mirror with equal angular velocity to equal velocity deflection, a surface falling-down compensating lens for compensating the surface falling-down of the rotatable polygon mirror for the laser light flux compensated by the f lens and focusing the laser light flux on the surface to be scanned, and a light intercepting member for intercepting laser light flux transmitted through the f lens and directed toward the edge portion at the side of ending the scanning of the surface falling-down compensating lens. The light intercepting member may be a mounting member for mounting the surface falling-down compensating lens, an element mounted on the mounting member. The light intercepting member may also be painted or stuck on the surface falling-down compensating lens or on the mounting member. The scanning optical apparatus further includes plural laser light sources and a single light receiving element.
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