Patent ID: 8804024

Claim:
An optical imaging lens, sequentially from an object side to an image side, comprising an aperture stop, first, second, third and fourth lens elements, each of said first, second, third and fourth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein: said first lens element has positive refracting power, and said image-side surface thereof is a convex surface; said second lens element has negative refracting power, and said image-side surface thereof is a concave surface; said third lens element has positive refracting power, said object-side surface thereof is a concave surface, and said image-side surface thereof is a convex surface; said object-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis and a concave portion in a vicinity of a periphery of the fourth lens element; said optical imaging lens as a whole has only the four lens elements having refracting power; and the sum of the thickness of all four lens elements along the optical axis is ALT, an air gap between the first lens element and the second lens element along the optical axis is AGL 12 , and ALT and AGL 12 satisfy the equation: ALT/AGL 12 ≦36.