Scanning and imaging lens, optical scanning device and image forming apparatus

A scanning and imaging lens condensing a light flux deflected by a deflector onto a surface to be scanned as a beam spot, comprising a plurality of lenses, wherein:

• a shape in main scanning cross section of each of both surfaces of a lens on a side of deflector has a convex shape, and a shape in main scanning cross section of at least one surface of said lens on the side of deflector is a non-arc shape;
• a shape in main scanning cross section of a first surface of a lens on a side of surface to be scanned has a convex shape, and a shape in main scanning cross section of at least one surface of said lens on the side of surface to be scanned is a non-arc shape;
• said scanning and imaging lens has at least two special toroidal surfaces in each of which a curvature in sub-scanning cross section varies in main scanning direction;
• and
• each of said at least two special toroidal surfaces have no rotational symmetrical axis.