Patent ID: 8922915

Claim:
An optical imaging lens comprising, from an object side to an image side: a first lens element; a second lens element; a third lens element; and a fourth lens element, wherein each of the first lens element, the second lens element, the third lens element, and the fourth lens element have 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, 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, and the image-side surface of the first lens element has a convex portion in a vicinity of the optical axis and a convex portion near the circumference of the first lens element; the second lens element has a negative refracting power, the object-side surface of the second lens element has a concave portion in a vicinity of the optical axis and a concave portion near a circumference of the second lens element, and the image-side surface of the second lens element has a concave portion in a vicinity of the optical axis and a concave portion near the circumference of the second lens element; the third lens element has a positive refracting power, the object-side surface of the third lens element has a concave portion in a vicinity of the optical axis and 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 in a vicinity of the optical axis and a convex portion near the circumference of the third lens element; the fourth lens element has a negative refracting power, the object-side surface of the fourth lens element has a convex portion in a vicinity of the optical axis, and the image-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis and a convex portion near a circumference of the fourth lens element; the optical imaging lens has only four lens elements having a refracting power; and the optical imaging lens satisfies the following relations: 0.430≦T2/T3≦0.653; 0.208≦T4/ALT≦0.269; and 1.366≦(T1+T2)/AAG≦1.752, wherein T1 is a thickness of the first lens element along the optical axis, 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, T4 is a thickness of the fourth lens element along the optical axis, ALT is a sum of thicknesses of the first to fourth lens elements, and AAG is a sum of widths of air gaps between the first to fourth lens elements.