Patent ID: 8929000
Filing Date: 2015-01-06
Classification: G02B,H04N

Abstract:
1. An optical imaging lens, in an order from an object side to an image side, comprising first, second, third and fourth lens elements, each of said first, second, third, and fourth lens elements 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 with positive refracting power, and said object-side surface thereof being a convex surface; said second lens element with negative refracting power, said object-side surface thereof comprising a concave portion in the vicinity of the optical axis and said image-side surface comprising a concave portion in the vicinity of the periphery of said second lens element; said third lens element with positive refracting power, said object-side surface thereof being a concave surface and said image-side surface thereof being a convex surface; said object-side surface of said fourth lens element comprising a convex portion in the vicinity of the optical axis and said image-side surface of said fourth lens element comprising a concave portion in the vicinity of the optical axis and a convex portion in the vicinity of a periphery of the fourth lens element; lens as a whole having only the four lens elements with refracting power, wherein a central thickness of the second lens element along the optical axis is T2, a central thickness of the third lens element along the optical axis is T3, an air gap between the third lens element and the fourth lens element along the optical axis is G