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 an aperture stop and six lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, 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 first, second, third, fourth, fifth and sixth lens elements, each of said first, second, third, fourth, fifth and sixth lens elements having refracting power, an object-side surface facing toward the object side and an image-side surface facing toward the image side and a central thickness defined along the optical axis, wherein:
said image-side surface of said first lens element comprises a convex portion in a vicinity of a periphery of the first lens element; said image-side surface of said second lens element comprises a concave portion in a vicinity of the optical axis; said image-side surface of said third lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said fourth lens element comprises a concave 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, said image-side surface of said fifth lens element comprises a convex portion in a vicinity of the optical axis; said image-side surface of said sixth lens element which is constructed by plastic material comprises a concave portion in a vicinity of the optical axis; the central thickness of the fifth lens element is represented by T5, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, and T5 and G45 satisfy the equation: T5/G45≦2; the optical imaging lens comprises no other lenses having refracting power beyond the six lens element.