Abstract: A method of manufacturing an optical filtering element includes a preparing step and a layer-forming step. The preparing step comprises preparing a glass material, a red light absorbing material composed of a medium and an organic pigment, and an infrared reflective-layer material composed by two or more materials with different reflectivities stacked with each other. The glass material is cut to form multiple glass substrates. The red light absorbing material is coated on the glass substrates and is heated at 300° C. to form a red light absorbing layer on each glass substrate. The infrared reflective-layer material is coated on the glass substrates to form multiple infrared light reflective layers on each glass substrate.

Abstract: Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises four lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refractive power of the lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.