Optical imaging lens group

Patent metadata

Field	Value
Publication number	US-12523849-B2
Application number	US-202117644950-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Jan 25, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

The present disclosure discloses an optical imaging lens group, along an optical axis from an object side to an image side, sequentially includes: an autofocus assembly, a first lens, a second lens, a third lens, a fourth lens, and at least one subsequent lens, where, a radius of curvature of an image-side surface of the autofocus assembly is variable.

First claim

What is claimed is:

1 . An optical imaging lens group, along an optical axis from an object side to an image side sequentially comprising: an autofocus assembly, a first lens having refractive power, a second lens having refractive power, a third lens having negative refractive power, a fourth lens having refractive power, and a fifth lens having negative refractive power, wherein a number of lenses having refractive powers in the optical imaging lens group is five, wherein,
a radius of curvature of an image-side surface of the autofocus assembly is variable,
wherein a center thickness CT 1 of the first lens on the optical axis and a center thickness CT 4 of the fourth lens on the optical axis satisfy: 1.0<CT 4 /CT 1 <3.0.

2 . The optical imaging lens group according to claim 1 , wherein a radius of curvature R 5 of an object-side surface of the third lens and a radius of curvature R 6 of an image-side surface of the third lens satisfy: 1.5<|R 5 /R 6 |<3.5.

3 . The optical imaging lens group according to claim 1 , wherein a radius of curvature R 1 of an object-side surface of the first lens and a radius of curvature R 2 of an image-side surface of the first lens satisfy: −3.5<(R 2 /10)/R 1 <−0.5.

4 . The optical imaging lens group according to claim 1 , wherein a center thickness CT 3 of the third lens on the optical axis and a center thickness CT 5 of the fifth lens on the optical axis satisfy: 1.5<CT 5 /CT 3 <3.5.

5 . The optical imaging lens group according to claim 1 , wherein a spaced interval T 12 between the first lens and the second lens on the optical axis and a spaced interval T 23 between the second lens and the third lens on the optical axis satisfy: 2.0<T 23 /T 12 <9.5.

6 . The optical imaging lens group according to claim 1 , wherein a total effective focal length f of the optical imaging lens group is adjustable by changing the radius of curvature of the image-side surface of the autofocus assembly, and an effective focal length f 2 of the second lens and the total effective focal length f of the optical imaging lens group satisfy: −3.0<f 2 /f<−1.0.

7 . The optical imaging lens group according to claim 1 , wherein a total effective focal length f of the optical imaging lens group is adjustable by changing the radius of curvature of the image-side surface of the autofocus assembly, and an effective focal length f 3 of the third lens the total effective focal length f of the optical imaging lens group satisfy: −6.5<af3/f<−3.0.

8 . The optical imaging lens group according to claim 1 , wherein a distance TTL from the object-side surface of the first lens to an imaging plane of the optical imaging lens group on the optical axis and half of a diagonal length ImgH of an effective pixel area on the imaging plane of the optical imaging lens group satisfy: 2.0<TTL/ImgH<2.5.

9 . The optical imaging lens group according to claim 1 , wherein a distance BFL from an image-side surface of a lens closest to an imaging plane of the optical imaging lens group to the imaging plane of the optical imaging lens group on the optical axis and a center thickness D of the autofocus assembly on the optical axis satisfy: 0.5<BFL/D<1.

10 . The optical imaging lens group according to claim 1 , wherein Semi-FOV is half of a maximum field-of-view of the optical imaging lens group, which satisfies: Semi-FOV≥30°.

11 . The optical imaging lens group according to claim 1 , wherein the first lens has positive refractive power, the second lens has negative refractive power.

12 . The optical imaging lens group according to claim 11 , wherein the fourth lens has positive refractive power.

13 . The optical imaging lens group according to claim 11 , wherein the fourth lens has negative refractive power.

Assignees

• Zhejiang Sunny Optics Co Ltd

Inventors

• Guo Yanling
• Wang Yuhao
• Wang Jian
• He Lingbo
• Huang Lin
• Dai Fujian
• Zhao Liefeng

Classifications

• H04N23/67

  Focus control based on electronic image sensor signals · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B3/14

  of variable focal length · CPC title

• G02B13/0075

  having an element with variable optical properties · CPC title