OPTICAL SCANNING DEVICE AND ITS LENS ADJUSTING METHOD

PROBLEM TO BE SOLVED: To obtain an integrated type cylindrical lens which is small-sized and easily fitted to an optical frame. SOLUTION: A 2nd cylindrical lens 16 which has negative refractive index and a plastic lens has a concave lens effective part 16a that laser light passes through, three guide parts 16b where a 1st cylindrical lens 15 as a glass lens is nearly positioned outside the effective part 16a, three abutting reference surfaces 16c which abut against the 1st cylindrical lens 15 to prescribe its interval, and a land part 16d for adhesion for holding the 1st cylindrical lens 15 from both sides. The 1st cylindrical lens 15 is inserted along the guide part 16b of the 2nd cylindrical lens 16, and while it abuts against the abutting reference surfaces 16c, if the two lenses 15 and 16 are adhered and fixed with an adhesive by using the land 16d for adhesion, their optical axes are nearly aligned with each other.