Patent ID: 9052492
Filing Date: 2015-06-09
Classification: G02B

Abstract:
1. An imaging lens comprising an aperture stop and first, second, third, fourth and fifth lens elements arranged from an object side to an image side in the given order along an optical axis of said imaging lens, each of said first, second, third, fourth and fifth 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 of said first lens element being a convex surface; said second lens element has a negative refractive power, said image-side surface of said second lens element having 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 image-side surface of said fourth lens element has a concave portion in a vicinity of the optical axis; and said image-side surface of said fifth 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 fifth lens element; wherein said imaging lens does not include any lens element with refractive power other than said first, second, third, fourth and fifth lens elements, and satisfies 0.85≦T5/T3, where T3 represents a distance between said object-side surface and said image-side surface of said third lens element at the optical axis, and T5 represents a distance between said object-side surface and said image-side surface of said fifth lens element at the optical axis.