Patent ID: 8035677

Claim:
An optical scanning apparatus comprising: a light source for emitting a light beam; a deflecting device comprising a deflecting element for deflecting the light beam, from said light source, to a surface to be scanned and comprising a motor for driving the deflecting element; an optical system casing for accommodating said light source and said deflecting device; a first wall portion, provided between said light source and said deflecting device to face said deflecting device, having a first opening for permitting passing of the light beam from said light source toward said deflecting device; a second wall portion, provided between said first wall portion and said light source, having a second opening for permitting passing of the light beam from said light source toward said deflecting device; and a connecting portion for connecting said first wall portion and said second wall portion, wherein said first wall portion, said second wall portion, and said connecting portion define a closed surface except for the first opening and the second opening.