Patent ID: 9645360
Date: 2017-05-09
CPC Classifications: G02B

Claim:
1. An optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising a first lens element, a second lens element, an aperture stop, a third lens element, a fourth lens element and a fifth lens element, each of said first, second, third, fourth and fifth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein: said object-side surface of said first lens element comprises a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of said first lens element, wherein a central thickness of said first lens element is represented by T 1 , and G 23 and T 1 satisfy the inequality: G 23 / T 1 ≦1.6; said object-side surface of said second lens element comprises a concave portion in a vicinity of a periphery of said second lens element; said object-side surface of said third lens element comprises a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of said third lens element, and said image-side surface of said third lens element comprises a convex portion in a vicinity of the optical axis; said fourth lens element has negative refracting power; said object-side surface of said fifth lens element comprises a convex portion in a vicinity of the optical axis, said object-side surface of the fifth lens element further comprises a convex portion in a vicinity of a periphery of the fifth lens element, and said image-side surface of said fifth lens element comprises a convex portion in a vicinity of a periphery of said fifth lens element; said optical imaging lens comprises no other lenses having refracting power beyond said five lens elements; and an effective focal length of said optical imaging lens is represented by EFL, an air gap between said second lens element and said third lens element along the optical axis is represented by G 23 , an air gap between said fourth lens element and said fifth lens element along the optical axis is represented by G 45 , and EFL, G 23 and G 45 satisfy the inequalities: