Patent ID: 8913330

Claim:
An optical imaging lens comprising, from an object side to an image side: an aperture stop; a first lens element; a second lens element; a third lens element; a fourth lens element; and a fifth lens element, each of the first, second, third, fourth and fifth lens element having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein: the first lens element has a positive refracting power and the object-side surface of the first lens element has a convex portion in a vicinity of an optical axis and a convex portion near a circumference of the first lens element; the second lens element has a negative refracting power; the object-side surface of the third lens element has a concave portion near a circumference of the third lens element and the image-side surface of the third lens element has a convex portion near the circumference of the third lens element; the fourth lens element has a positive refracting power, the object-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis and a concave portion near a circumference of the fourth lens element, and the image-side surface of the fourth lens element has a convex portion in a vicinity of the optical axis and a convex portion near the circumference of the fourth lens element; the fifth lens element has a negative refracting power, the image-side surface of the fifth lens element has a concave portion in a vicinity of the optical axis and a convex portion near a circumference of the fifth lens element; the optical imaging lens has only five lens elements having a refracting power; and the optical imaging lens satisfies the following relations: 2.200 ≦T 2 /AG 12≦3.100; 0.659 ≦T 2 /T 3≦1.219; and 1.551 ≦ALT/AAG≦ 2.531, wherein T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, AG12 is a width of an air gap between the first and second lens elements along the optical axis, ALT is a sum of thicknesses of the first to fifth lens elements, and AAG is a sum of widths of air gaps between the first to fifth lens elements.