Patent ID: 9341816
Filing Date: 2016-05-17
CPC Classification: G02B,H04N

Claim Text:
1. An optical imaging lens comprising, from an object side to an image side, an aperture stop, a first lens element, a second lens element, a third lens element, and a fourth lens element, each of the 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: the first lens element has a positive refracting power, and the object-side surface of the first lens element has a convex portion in a vicinity of an optical axis and a convex portion near a circumference of the first lens element; the second lens element has a negative refracting power; the third lens element has a positive refracting power, the object-side surface of the third lens element has a concave portion near a circumference of the third lens element, and the image-side surface of the third lens element has a convex portion in the vicinity of the optical axis and a convex portion near a circumference of the third lens element; the object-side surface of the fourth lens element has a convex portion in the vicinity of the optical axis, and the fourth lens element has a negative refracting power, and the image-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis and a convex portion near the circumference of the fourth lens element; and the optical imaging lens has only four lens elements having a refracting power; a thickness of the second lens element along the optical axis is defined as T a thickness of the fourth lens element along the optical axis is T