US Patent 7609313 Image pick-up lens, image pick-up unit and mobile terminal

An image pick-up lens for forming an image of an object on a solid image pick-up element having a rectangular effective pixel area, has a first lens; a second lens; a third lens; and a diaphragm having an aperture. The following conditional expressions are satisfied:15°<IAD<35°|IAh−(IAD·Yh/YD)|<5°where,YD: a length of ½ of the diagonal length of the rectangular effective pixel area of the solid image pick-up element,Yh: an arbitrary image height of the image pick-up lens (where, Yh<YD),IAD: an angle formed between a chief ray of a light flux forming an image at the image height YD of the image pick-up lens and the optical axis, andIAh: an angle formed between a chief ray of a light flux image forming an image at the image height Yh of the image pick-up lens, and the optical axis.