Patent ID: 8908296

Claim:
An imaging lens comprising first, second, third, and fourth lens elements arranged in order from an object side to an imaging side, each of the first, second, third, and fourth lens elements having an object side surface facing toward the object side, and an imaging side surface facing toward the imaging side, wherein, 30<vd1−vd2, wherein vd1and vd2are Abbe numbers of the first and second lens elements, respectively; 0.4<d3avg/d4avg <0.7, wherein d3avg and d4avg are average diameters of the third and fourth lens elements, respectively; and a ratio of a sag at 5 percent point and a sag at 100 percent point of the imaging-side surface of the first lens element is in a range from -0.0082 to 0.0114.