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 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 refraction 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 object-side surface of said first lens comprises a convex portion in a vicinity of the optical axis; said image-side surface of the second lens element comprises a concave portion in a vicinity of a periphery of said second lens element, and said object-side surface of said second lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said third lens element comprises a concave portion in a vicinity of a periphery of said third lens element; said object-side surface of said fourth lens element comprises a concave portion in a vicinity of the optical axis; said fifth lens element has a positive refraction power, and said object-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 comprises a concave portion in a vicinity of the optical axis; the optical imaging lens comprises no other lenses having refraction power beyond the six lens elements; and an air gap between the second lens element and the third lens element along the optical axis is represented by G23, an air gap between the fifth lens element and the sixth lens element along the optical axis is represented by G56, a distance between the object-side surface of the first lens element and an image plane along the optical axis is represented by TTL, the central thickness along the optical axis of the third lens element is represented by T3, the central thickness along the optical axis of the fourth lens element is represented by T4, and G23, G56, TTL, T3, and T4 satisfy the equations:
1.4≦G23/G56;TTL/T4≦19.0; and0.96≦T3/T4.