| 摘要 |
An imaging lens with a perfect imaging quality and a low manufacture cost is provided for using in an image reading apparatus or an image forming apparatus by controlling a surface shape error thereof in a predetermined range disclosed by the present invention. The imaging lens includes a plurality of lenses, and an aperture stop, wherein a vertical interval between a convex in one direction with respect to a lens surface and a concave in the other direction reverse to the one direction on at least one surface of a lens disposed adjacent to the aperture stop is controlled not greater than ½ with respect to a wavelength in a wave range used, the vertical interval is a surface shape error which is set as a deviation between the lens surface and a proximal spherical surface thereof.
|
