Patent ID: 9531900
Filing Date: 2016-12-27
CPC Classification: G02B,H04N

Claim Text:
1. An optical scanning apparatus comprising; a light source configured to emit a light beam; a rotary polygonal mirror configured to deflect the light beam emitted from the light source, so as to scan the light beam on a photosensitive member in a scanning direction; an optical member configured to guide the light beam deflected by the rotational polygonal mirror to the photosensitive member; a housing in which the rotational polygonal mirror and the optical member are disposed; a cover member attached to the housing, in which cover member there is formed an emission opening to externally emit the light beam deflected by the rotational polygonal mirror, from within a space formed by the housing and the cover member; a transparent member configured to pass the light beam and to close off the emission opening; a seal member formed of an elastic material, to close off a gap between the transparent member and the cover member; an inlet for pouring in the molten elastic material when forming the seal member; and a channel through which the molten elastic material poured in from the inlet flows, the channel being formed in the cover member following an edge of the emission opening so as to surround the emission opening, wherein the inlet is connected to the channel between both ends of the emission opening in the longitudinal direction of the emission opening, and a cross-sectional area of the channel in the lateral direction of the emission opening following the edge of the emission opening closer to the inlet in the longitudinal direction of the emission opening, is larger than a cross-sectional area of the channel in the lateral direction following the edge of the emission opening farther from the inlet in the longitudinal direction of the emission opening.