Patent ID: 9217845
Filing Date: 2015-12-22
Classification: G02B,H04N

Abstract:
1. An imaging lens comprising an aperture stop, a first lens element, a second lens element, a third lens element and a fourth lens elements arranged from an object side to an image side in the given order, 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 has a positive refractive power, said object-side surface thereof is a convex surface, and said image-side surface of said first lens element has a concave portion in a vicinity of an optical axis of said imaging lens; said second lens element has a negative refractive power, and said image-side surface thereof has a convex portion in a vicinity of the optical axis of said imaging lens; said object-side surface of said third lens element has a concave portion in a vicinity of the optical axis; said object-side surface of said fourth lens element has a convex portion in a vicinity of the optical axis; said image-side surface of said fourth lens element has a concave portion in a vicinity of the optical axis, and a convex portion in a vicinity of a periphery of said fourth lens element; and said imaging lens does not include any lens element with refractive power other than said first, second, third, and fourth lens elements.