Patent ID: 8724199
Filing Date: 2014-05-13
Classification: B41J,G02B

Abstract:
1. An optical scanning apparatus comprising: a light source configured to emit a light beam; a deflecting device disposed on a surface of the optical scanning apparatus, the deflecting device including a rotational polygon mirror that deflects the light beam from the light source such that a photosensitive member is scanned with the light beam deflected by the rotational polygon minor, and a drive unit that rotates the rotational polygon mirror; a first lens configured to pass therethrough the light beam deflected by the rotational polygon mirror; a wall disposed between the first lens and the deflecting device; a reflection mirror configured to reflect the light beam that has passed through the first lens; a second lens disposed between the deflection device and the wall in a direction perpendicular to a rotation shaft of the rotational polygon minor and disposed on a side opposite to the surface on which the rotational polygon minor is disposed in relation to the rotational polygon mirror in a direction of the rotation shaft, and on which the light beam reflected by the reflection mirror and passing outside of the wall in the direction of the rotation shaft is incident; and a shielding portion disposed between the second lens and an optical path of the light beam between the rotational polygon mirror and the wall configured to shield the second lens such that an air flow generated by the deflecting device does not collide against the second lens directly from a space between the wall and the deflecting device.