Patent ID: 7446910

Claim:
An optical scanning device, comprising: a base plate having a first surface and a second surface opposite to the first surface; a light source mounted on the first surface of the base plate, the light source emitting a light beam; a reflecting body mounted on the first surface of the base plate, the reflecting body deflecting and scanning the light beam emitted from the light source; a condenser lens mounted on the first surface of the base plate; a substrate mounted on the base plate, the condenser lens being located between the base plate and the substrate, the substrate extending substantially parallel with the base plate, the substrate having a first substrate surface and a second substrate surface opposite to the first substrate surface, the second substrate surface of the substrate confronting the first surface of the base plate; a synchronization detection element mounted on the second substrate surface of the substrate, the synchronization detection element receiving the light that has been deflected by the reflecting body and that has passed through the condenser lens to perform synchronization detection for image formation; and a circuit element mounted on the first substrate surface of the substrate, the circuit element controlling the light source.