Patent ID: 9307130
Filing Date: 2016-04-05
CPC Classification: G02B,H04N

Claim Text:
1. An imaging lens comprising an aperture stop, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element arranged in order from an object side to an image side along an optical axis of said imaging lens, each of said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element having an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein: said first lens element has a refractive power; said image-side surface of said second lens element has a concave portion in a vicinity of a periphery of said second lens element; said object-side surface of said third lens element has a concave portion in a vicinity of a periphery of said third lens element; said object-side surface of said fourth lens element has a concave portion in a vicinity of the optical axis of said imaging lens; said fifth lens element has a refractive power; said object-side surface of said sixth lens element has a convex portion in a vicinity of the optical axis of said imaging lens; and said imaging lens does not include any lens element with refractive power other than said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element; wherein said imaging lens satisfies ALT/T5≦6.90, where T5 represents a thickness of said fifth lens element at the optical axis, and ALT represents a summation of thicknesses of said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element at the optical axis, and wherein said imaging lens further satisfies Gaa/T1≦2.0, where Gaa represents a summation of five air gap lengths among said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element at the optical axis, and T1 represents the thickness of said first lens element at the optical axis.