Beam scanning apparatus and apparatus for writing image information.

摘要

A beam scanning apparatus for scanning light beam on a scanning surface, has a deflector, a scanning mechanism, a detector and a controller. The deflector deflects the light beam so as to guide it to the scanning surface. The scanning mechanism functions to change at least one of a deflection angle and a deflection position of the deflector so that the light beam is scanned on the scanning surface. The detector detects the scanning state of the light beam by the scanning mechanism on the scanning surface by receiving the light beam from the deflector. The controller corrects at least one of the deflection angle and the deflection position of the deflector on the basis of the detection result of the detector.