US 12,392,997 B2
Optical system, image capturing module, and electronic device
Jinhua Zou, Nanchang (CN); Ming Li, Nanchang (CN); and Hairong Zou, Nanchang (CN)
Assigned to JIANGXI JINGCHAO OPTICAL CO., LTD., Nanchang (CN)
Appl. No. 17/614,359
Filed by JIANGXI JINGCHAO OPTICAL CO., LTD., Nanchang (CN)
PCT Filed Apr. 8, 2020, PCT No. PCT/CN2020/083697
§ 371(c)(1), (2) Date Nov. 25, 2021,
PCT Pub. No. WO2021/203277, PCT Pub. Date Oct. 14, 2021.
Prior Publication US 2022/0236535 A1, Jul. 28, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/62 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/62 (2013.01); G02B 13/006 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical system, sequentially arranged from an object side to an image side, comprising:
a first lens having a positive refractive power;
a second lens having a refractive power;
a third lens having a negative refractive power, an object side surface and an image side surface of the third lens being both concave at circumferences thereof;
a fourth lens having a negative refractive power;
a fifth lens having a positive refractive power, at least one of an object side surface and an image side surface of the fifth lens having an inflection point; and
a sixth lens having a negative refractive power;
wherein the optical system satisfies the following relational expressions:
0.60<CT1/SD11<1.01;
5.5<TTL/CT1≤6.84; and
2.2≤FNO≤2.6;
wherein, CT1 is a thickness of the first lens on an optical axis, SD11 is half of a maximum effective aperture of an object side surface of the first lens, TTL is a distance from the object side surface of the first lens to an imaging plane of the optical system on the optical axis, and FNO is an f-number of the optical system.