| 摘要 |
An optical scanner to be used for an image forming apparatus such as a digital copying machine comprises a light source such as a semiconductor laser for emitting a light beam, a deflection element such as a rotary polygon mirror for deflecting the emitted light beam, and an imaging optical system for focusing the deflected light beam on a surface to be scanned, typically a photosensitive drum surface. The imaging optical system includes at least first and second optical elements as well as a reflector mirror arranged on the optical path between the first optical element and the second optical element for reflecting the light beam coming from the former and leading it to the latter so that any displacement of the scanning spot in the sub-scanning direction may effectively be eliminated.
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