Patent ID: 8004552

Claim:
An optical scanning device scanning a photoreceptor with a light beam from a light source through at least lenses, the lenses including a long lens elongated in the main scanning direction for the photoreceptor, at least one of the lenses including support ends formed at both ends of and outside of the lens effective area in the longitudinal direction of the lens, one of the support ends formed at both the ends including a first projection that projects from a side surface in the incoming or outgoing direction of the beam for the lens, the first projection positioning the lens in the longitudinal direction relative to a housing supporting the lens, wherein the housing has a pair of concave places retaining both the ends of the lens and facing each other, wherein the concave places has upper opening portions allowing the support ends of the lens to be inserted, lateral opening portions opposed to each other to receive the support ends of the inserted lens, and one of opposed side walls forming the concave places with a groove engaging with the first projection, and wherein the lens is inserted from the upper opening portions of the concave places and positioned and equipped in the longitudinal direction of the lens relative to the housing with the first projection engaged in the groove.