| 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 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 first lens 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 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 convex portion in a vicinity of a periphery of the third lens element; said image-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said fifth lens element which is constructed by plastic comprises a convex portion in a vicinity of the optical axis; the optical imaging lens comprises no other lenses having refracting power beyond the five lens elements; and the central thickness of the third lens element is represented by T3, the central thickness of the fifth lens element is represented by T5, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, a sum of the central thicknesses of all five lens elements is represented by ALT, a distance between the object-side surface of the first lens element and an image plane along the optical axis is represented by TTL, and TTL, T3, T5, G23 and ALT satisfy the equations:
TTL/T3≦13;ALT/T5≦3.7; andT3/G23≦2.0. |
