Patent ID: 9541737
Date: 2017-01-10
CPC Classifications: G02B,H04N

Claim:
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 first lens element has negative refracting power; said image-side surface of said first lens comprises a concave portion in a vicinity of a periphery of the first lens element; said object-side surface of said second lens comprises a concave portion in a vicinity of a periphery of the second lens element; 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 third lens element comprises a convex portion in a vicinity of a periphery of the third lens element; said object-side surface of said fourth lens element comprises a concave portion in a vicinity of a periphery of the fourth lens element; said fifth lens element is constructed by plastic material; said object-side surface of said sixth lens element which is constructed by plastic material comprises a convex portion in a vicinity of the optical axis, said image-side surface thereof comprises a concave portion in a vicinity of the optical axis; the optical imaging lens comprises no other lenses having refracting power beyond the six lens element; and the central thickness of the sixth lens element is represented by T6, a sum of the central thicknesses of all six lens elements is represented by ALT, and T6 and ALT satisfy the equation: