Patent ID: 7796147
Filing Date: 2010-09-14
Classification: B41J,G02B,H04N

Abstract:
1. An optical scanner comprising: a light source configured to emit a light beam; a polygon mirror configured to rotate and deflect the light beam to be scanned in a scanning direction; an optical member configured to focus the light beam deflected by the polygon mirror onto a scanning target; a casing housing the polygon mirror and the optical member and including a first wall portion having a wall inner surface opposing the polygon mirror and the optical member and a wall outer surface opposing the scanning target, the first wall portion being formed with an exit hole through which the light beam is irradiated toward the scanning target; and an exit hole cover formed of a light transmissible member and sealed to the wall outer surface to cover the exit hole to prevent dust particles from entering the casing, and wherein a part of the optical member is sunk into the exit hole so that an end of the optical member is positioned closer to the exit hole cover than the wall inner surface while another part of the optical member remains farther away from the exit hole cover than the wall inner surface.