Mobile device and optical imaging lens thereof

摘要

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

主权项

1. An optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising an aperture stop, 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 image-side surface thereof comprises a convex portion in a vicinity of a periphery of the first lens element; said second lens element has negative refracting power, and said image-side surface thereof is a concave surface; said object-side surface of said third lens element comprises a concave portion in a vicinity of a periphery of the third lens element, and said image-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of the third lens element; said fourth lens element has negative refracting power, and said object-side surface of said fourth lens element is a concave surface; said image-side surface of said fifth lens element comprises a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the fifth lens element; a central thickness of the third lens element along the optical axis is thicker than a central thickness of the fourth lens element along the optical axis; a central thickness of the fifth lens element along the optical axis is thicker than a central thickness of the third lens element along the optical axis; and the optical imaging lens as a whole comprises only the five lens elements having refracting power; an air gap between the third lens element and the fourth lens element along the optical axis is G34, the sum of the thickness of all five lens elements along the optical axis is ALT, and ALT and G34 satisfy the equation:
3.5≦ALT/G34≦15; an air gap between the second lens element and the third lens element along the optical axis is G23, an effective focal length is EFL, and G23 and EFL satisfy the equation:
7≦EFL/G23≦16.