Patent ID: 9690074
Date: 2017-06-27
CPC Classifications: G02B

Claim:
1. An imaging lens, the imaging lens comprising in an ordered way from an object side to an image side: a first lens having positive (+) refractive power; a second lens having negative (−) refractive power; a third lens having positive (+) refractive power; a fourth lens having positive (+) refractive power; and a fifth lens having negative (−) refractive power, wherein the fifth lens has a convex form at an object side surface thereof at an optical axis of the imaging lens, wherein a conditional expression of 4.7<ΣT<5.9, 0.5<ΣT/fz1, ΣT/fz2, ΣT/fz3<1.5 is satisfied, where a distance from an object side surface of the first lens to an image-forming surface is ΣT; where focus distances of the imaging lens are respectively fz1, fz2, and fz3 at zoom positions 1, 2, and 3; and wherein a distance to object is infinity at the zoom position 1, a distance to object is 60 cm at the zoom position 2, and a distance to object is 10 cm at the zoom position 3.