Patent ID: 7535612

Claim:
An optical scanner to scan a plurality of objects respectively with optical beams emitted from an optical beam emitter, the optical scanner comprising: a deflector assembly including at least one deflecting unit configured to deflect the optical beams in a main scanning direction; and a plurality of reflection optical systems each including, a plurality of reflection mirrors configured to reflect one of the optical beams, and a curvature adjustment unit including a holder structure configured to forcibly curve one of the plurality of reflection mirrors in a direction opposite the main scanning direction and a pressure unit configured to push the reflection mirror in a direction opposite the direction of the forcible curve, wherein the curvature adjustment unit adjusts a direction and an amount of curvature of a main scanning line on the object by adjusting an amount that the pressure unit deforms the reflection mirror, and a direction of a curve of the main scanning line on the object caused by the forcible curve of the reflection mirror formed by the holder structure is similar in the plurality of objects.