US 12,321,037 B2
Optical system, camera module, and automobile
Hairong Zou, Nanchang (CN); Yuming Le, Nanchang (CN); Byoungtaek Yoo, Nanchang (CN); and Binli Lan, Nanchang (CN)
Assigned to JIANGXI JINGCHAO OPTICAL CO., LTD., Nanchang (CN)
Appl. No. 17/633,197
Filed by JIANGXI JINGCHAO OPTICAL CO., LTD., Nanchang (CN)
PCT Filed Aug. 7, 2019, PCT No. PCT/CN2019/099542
§ 371(c)(1), (2) Date Feb. 5, 2022,
PCT Pub. No. WO2021/022500, PCT Pub. Date Feb. 11, 2021.
Prior Publication US 2022/0334352 A1, Oct. 20, 2022
Int. Cl. G02B 9/60 (2006.01); G02B 5/20 (2006.01)
CPC G02B 9/60 (2013.01) [G02B 5/208 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical system, consisting of, sequentially from an object side to an image side:
a first lens having a negative refractive power, an object side surface of the first lens being convex, and an image side surface of the first lens being concave;
a second lens having a negative refractive power, an image side surface of the second lens being concave;
a third lens having a positive refractive power;
a stop;
a fourth lens having a positive refractive power; and
a fifth lens having a negative refractive power;
the optical system satisfying the following relations:
(SD S2)/(RDY S2)<0.93;
wherein SD S2 denotes a Y-direction semi-aperture of the image side surface of the first lens, and RDY S2 denotes a Y-radius of the image side surface of the first lens; and
Nd2≤1.55;Nd4≤1.55;Vd2≥54; and Vd4≥54;
wherein Nd2 denotes a refractive index of d-line of the second lens, Nd4 denotes a refractive index of d-line of the fourth lens, Vd2 denotes an abbe number of the second lens, and Vd4 denotes an abbe number of the fourth lens.