Optical imaging lens

Abstract

An optical imaging lens including a first, a second, a third and a fourth lens element sequentially along an optical axis from an object-side to an image-side is provided. The first to the fourth lens element each includes an object-side surface facing toward the object-side and allowing an imaging ray to pass through as well as an image-side facing toward the image-side and allowing the imaging rays to pass through. Wherein an optical axis region of the image-side surface of the third lens element is concave, a periphery region of the object-side surface of the fourth lens element is convex, an optical axis region of the image-side surface of the fourth lens element is concave, a periphery region of the image-side surface of the fourth lens element is convex, and the lens elements of the optical imaging lens has only the four lens elements.