Patent ID: 9395518
Filing Date: 2016-07-19
CPC Classification: G02B

Claim Text:
1. An imaging lens comprising: a first lens having a positive (+) power; a second lens having a positive (+) power; a third lens having a negative (−) power; and a fourth lens having a positive (+) power; wherein the first lens, the second lens, the third lens, and the fourth lens are sequentially disposed away from an object side to transmit an image of light having a wavelength band in a range between about 400 nm and about 1,000 nm and receive visible light and infrared light, such that the imaging lens is used during day and night; wherein all of the first to fourth lenses are aspherical lenses; wherein the fourth lens has an aspheric surface inflection point on an image side surface thereof; wherein both the second lens and the fourth lens are doublet lenses; wherein the second lens comprises a first sub lens having a positive (+) power and a second sub lens having a negative (−) power in an order from the object side to the image side of the imaging lens, and the first sub lens and the second sub lens jointly have a first contact surface, and the first contact surface is flat or concave toward the second sub lens; wherein the fourth lens comprises a third sub lens having a positive (+) power and a fourth sub lens having a negative (−) power in order from the object side to the image side of the imaging lens, and the third sub lens and the fourth sub lens jointly have a second contact surface and the second contact surface is flat or concave toward the fourth sub lens; wherein the third lens is a bi-concave lens; wherein the first sub lens has a convex surface on the object side thereof, and the second sub lens has a concave surface on the image side thereof; and wherein the third sub lens has a convex surface on the object side thereof, and the fourth sub lens has a concave surface on the image side thereof.