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 may comprise an aperture stop and five lens elements positioned sequentially from an object side to an image side. By 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 may exhibit 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, and first, second, third, fourth and fifth lens elements, each of said first, second, third, fourth and fifth lens elements having refracting index, 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 second lens element comprises a concave portion in a vicinity of the optical axis; said object-side surface of said fourth lens element comprises a convex portion in a vicinity of a periphery of the fourth lens element, and said image-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the fourth lens element; said image-side surface of said fifth lens element comprises a concave portion in a vicinity of the optical axis; the optical imaging lens comprises no other lenses having refracting index beyond the five lens elements; and an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, a sum of the central thicknesses of all five lens elements is represented by ALT, and G34 and ALT satisfy the inequality:
4≦ALT/G34≦10.