US 12,242,134 B2
Optical system, lens module, and electronic device
Jinhua Zou, Jiangxi (CN); Binbin Liu, Jiangxi (CN); and Hairong Zou, Jiangxi (CN)
Assigned to JIANGXI JINGCHAO OPTICAL CO., LTD., Jiangxi (CN)
Filed by JIANGXI JINGCHAO OPTICAL CO., LTD., Jiangxi (CN)
Filed on Aug. 27, 2021, as Appl. No. 17/459,022.
Application 17/459,022 is a continuation of application No. PCT/CN2019/103897, filed on Aug. 31, 2019.
Prior Publication US 2021/0389557 A1, Dec. 16, 2021
Int. Cl. G02B 9/62 (2006.01); G02B 13/00 (2006.01); G02B 5/20 (2006.01)
CPC G02B 9/62 (2013.01) [G02B 13/0045 (2013.01); G02B 5/208 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical system comprising, in order from an object side to an image side along an optical axis:
a first lens with a negative refractive power;
a second lens with a positive refractive power;
a third lens with a negative refractive power;
a fourth lens with a refractive power;
a fifth lens with a positive refractive power, wherein the fifth lens has an object-side surface which is convex near the optical axis and concave near a periphery of the object-side surface of the fifth lens, the object-side surface of the fifth lens has at least one inflection point;
a sixth lens with a negative refractive power, wherein the sixth lens has an object-side surface which is convex near the optical axis and concave near a periphery of the object-side surface of the sixth lens, and an image-side surface which is concave near the optical axis and convex near a periphery of the image-side surface of the sixth lens, and wherein at least one of the object-side surface and the image-side surface of the sixth lens has at least one inflection point; and
the optical system satisfies the following expression:
−9<f4/|f1|<3.5;
wherein f1 represents an effective focal length of the first lens, f4 represents an effective focal length of the fourth lens, and
wherein an object-side surface and an image-side surface of each of the first lens to the sixth lens are rotationally symmetric.