Patent ID: 8207997
Filing Date: 2012-06-26
Classification: G02B

Abstract:
1. An optical scanning apparatus, comprising: a first scanning unit and a second scanning unit facing each other with a rotational polygon mirror interposed therebetween in a sub-scanning section, the first scanning unit and the second scanning unit each including: an incident optical system in which a light beam emitted from a light source is made incident on a deflecting surface of the rotational polygon mirror; and an imaging optical system including an imaging optical element configured to cause the light beam, deflected for scanning on the deflecting surface of the rotational polygon mirror, form an image on a surface to be scanned, wherein the light beam that enters the deflecting surface of the rotational polygon mirror enters obliquely with respect to a normal of the deflecting surface of the rotational polygon mirror in the sub-scanning section, wherein the first scanning unit includes an undesirable-light blocking member configured to block an undesirable light reflected on an optical surface of the imaging optical element of the second scanning unit to travel toward the surface to be scanned of the first scanning unit, wherein the undesirable-light blocking member is integrally formed with an optical box in which the drive circuit substrate is fixed, and wherein the second scanning unit includes an undesirable-light blocking member configured to block an undesirable light reflected on an optical surface of the imaging optical element of the first scanning unit to travel toward a surface to be scanned of the second scanning unit,