Patent ID: 7715075

Claim:
An optical beam scanning apparatus comprising: a body housing; a light source configured to emit one or plural light fluxes; a pre-deflection optical system configured to give a predetermined characteristic to the light flux emitted from the light source; an optical beam deflecting device configured to deflect the light flux, which is given with the predetermined characteristic by the pre-deflection optical system, to a scanned object by means of reflection in a main scanning direction; a sensor configured to detect a portion of the light flux deflected by the optical beam deflecting device; a holder base fixed to the body housing by a screw; a rotating holder attached to the holder base and provided with a shaft; a sensor substrate fixed to the rotating holder by a screw, the sensor being fixed to the sensor substrate; a rotation adjusting mechanism configured to rotationally adjust the rotating holder around the shaft with respect to the holder base; and a fixing mechanism configured to fix the rotating holder to the holder base.