Patent attributes
An image forming apparatus includes a photosensitive member and a scanning lens. The photosensitive member bears a latent image thereon and defines a main scanning direction. The scanning lens transmits a light beam scanningly deflected in the main scanning direction for exposing the photosensitive member to the light beam to form the latent image thereon. The scanning lens includes a lens body and a rib. The lens body is formed of resin and extends substantially in the main scanning direction. The lens body defines a sub-scanning direction perpendicular to the main scanning direction. The lens body has opposite surfaces that are both substantially perpendicular to the sub-scanning direction. The rib is formed integrally with the lens body and protrudes in the sub-scanning direction from either one of the opposite surfaces. The rib extends over a predetermined range in the main scanning direction.
