Patent ID: 8077371

Claim:
An optical beam scanning apparatus comprising: a light source configured to emit one or plural luminous fluxes; a pre-deflection optical system configured to form the luminous fluxes emitted from the light source to image the luminous fluxes as a line image in a direction corresponding to a main scanning direction; a light deflecting device configured to scan the luminous fluxes against a scanning object in the main scanning direction; a post-deflection optical system configured to at least include one or plural first optical elements which act on the luminous fluxes for all color components, and plural second optical elements which respectively act on the luminous fluxes for each of color components, the post-deflection optical system imaging the luminous fluxes scanned by the light deflecting device on the scanning object; and a position adjusting mechanism configured to adjust positions of the second optical elements, wherein the light deflecting device has deflection surfaces that form different angles with respect to a rotation center axis thereof, and each of the deflection surfaces corresponds to one of the color components.