US 12,436,369 B2
Optical test system
Yang Li, Yuyao (CN); Bin Liu, Yuyao (CN); Lingbo He, Yuyao (CN); Lin Huang, Yuyao (CN); Fujian Dai, Yuyao (CN); and Liefeng Zhao, Yuyao (CN)
Assigned to ZHEJIANG SUNNY OPTICS CO., LTD., Yuyao (CN)
Filed by Zhejiang Sunny Optics Co., Ltd., Yuyao (CN)
Filed on Jan. 13, 2022, as Appl. No. 17/575,210.
Claims priority of application No. 202110110283.5 (CN), filed on Jan. 27, 2021.
Prior Publication US 2022/0236525 A1, Jul. 28, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/34 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/004 (2013.01) [G02B 9/34 (2013.01); G02B 27/0025 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An optical test system, comprising, sequentially along an optical axis:
a distance extension module, comprising one or more lenses; and
an optical lens assembly, comprising, sequentially along the optical axis from an object side to an image side:
a diaphragm;
a first lens, having a positive refractive power, an object-side surface of the first lens being a convex surface, and an image-side surface of the first lens being a convex surface;
a second lens, having a negative refractive power, an object-side surface of the second lens being a concave surface, and an image-side surface of the second lens being a concave surface;
a third lens, having a refractive power, an object-side surface of the third lens being a concave surface, and an image-side surface of the third lens being a convex surface; and
a fourth lens, having a refractive power;
wherein the distance extension module converges parallel light to form a point light source used to simulate an object of the optical lens assembly; and
−2.0<f4/f≤−1.68,
wherein f4 is an effective focal length of the fourth lens, and f is a total effective focal length of the optical lens assembly,
wherein −4.5<f2/f3<−2.5, wherein f2 is an effective focal length of the second lens, and f3 is an effective focal length of the third lens.