Patent ID: 9341821
Filing Date: 2016-05-17
CPC Classification: G02B

Claim Text:
1. An optical imaging lens, sequentially from an object side to an image side, comprising first, second, third, fourth and fifth lens elements, 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 first lens element has positive refracting power, and said object-side surface comprises a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the first lens element; said second lens element has negative refracting power; said third lens element is made of plastic; said object-side surface of said fourth lens element comprises a concave portion in a vicinity of the optical axis, said image-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said fifth lens element comprises a concave portion in a vicinity of the optical axis; the optical imaging lens as a whole has only the five lens elements having refracting power; a central thickness of the second lens element along the optical axis is T2, a central thickness of the fourth lens element along the optical axis is T4, an air gap between the fourth lens element and the fifth lens element along the optical axis is G45, and T2, T4 and G45 satisfy the equation: a sum of air gaps from the first lens element to the fifth lens element along the optical axis is Gaa, a central thickness of the fifth lens element along the optical axis is T5, and Gaa and T5 satisfy the equation: