INFRARED COLLIMATING LENS AND INFRARED LENS MODULE

WIPO Patent Application WO/2022/052133

A1

Provided is an infrared collimating lens (110), comprising, sequentially arranged from the imaging side to the light source side, a diaphragm (115), a first lens (111), a second lens (112), and a third lens (113). The first and third lenses (111, 113) have a positive optical power, and the second lens (112) has a negative optical power. The near-axis region of the first lens (111) near the light source side is a concave surface, and the near-axis region near the imaging side is a convex surface; the near-axis region of the second lens (112) near the imaging side is a concave surface; the near-axis region of the third lens (113) near the light source side is a convex surface. At least one of the two surfaces of each lens is a non-spherical surface. Parameters of the lens (110) satisfy: 0.2<|(Y/f)*TTL|<0.8, 0.6