US 11,719,912 B2
Optical imaging system
Litong Song, Ningbo (CN); Fujian Dai, Ningbo (CN); and Liefeng Zhao, Ningbo (CN)
Assigned to Zhejiang Sunny Optical Co., Ltd, Ningbo (CN)
Filed by Zhejiang Sunny Optical Co., Ltd, Ningbo (CN)
Filed on Jun. 30, 2020, as Appl. No. 16/917,259.
Claims priority of application No. 201910671727.5 (CN), filed on Jul. 24, 2019.
Prior Publication US 2021/0026109 A1, Jan. 28, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/62 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/62 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical imaging system, sequentially from an object side to an image side of the optical imaging system along an optical axis, comprising:
a first lens having a negative refractive power, and an image-side surface of the first lens being concave;
a second lens having a positive refractive power;
a third lens having a positive refractive power, and an object-side surface of the third lens being convex and an image-side surface of the third lens being convex;
a fourth lens having a negative refractive power;
a fifth lens having a positive refractive power, and an image-side surface of the fifth lens being convex; and
a sixth lens having a negative refractive power;
wherein half of a maximum field-of-view Semi-FOV of the optical imaging system satisfies Semi-FOV>60°; and
wherein a maximum effective radius DT12 of the image-side surface of the first lens and a maximum effective radius DT62 of an image-side surface of the sixth lens satisfy 0.5<DT12/DT62<1;
wherein an on-axis distance SAG12 from an intersection of the image-side surface of the first lens and the optical axis to a vertex of an effective radius of the image-side surface of the first lens, and an edge thickness ET1 of the first lens satisfy: 0.5<SAG12/ET1<1.