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 of the lens elements and designing parameters satisfying an 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 and fifth lens elements, each of said first, second, third, fourth and fifth lens elements having refracting power, an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
said object-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 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 the optical axis; said object-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis, and said image-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis; said fifth lens element is constructed by plastic material, and said image-side surface thereof comprises a concave portion in a vicinity of the optical axis; the optical imaging lens as a whole comprises only the five lens elements having refracting power; and a central thickness of the first lens element along the optical axis is CT1, a central thickness of the fourth lens element along the optical axis is CT4, and CT1 and CT4 satisfy the equation:
1.40≦CT4/CT1.