Camera lens group

Patent metadata

Field	Value
Publication number	US-12197039-B2
Application number	US-201917043706-A
Country	US
Kind code	B2
Filing date	Oct 30, 2019
Priority date	Apr 2, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

The disclosure discloses a camera lens group, which sequentially includes, from an object side to an image side along an optical axis, a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens with focal power, wherein the first lens, the fourth lens, the sixth lens and the seventh lens have positive focal power; the eighth lens has negative focal power; a total effective focal length f of the camera lens group and a maximum Semi-Field of View (Semi-FOV) of the camera lens group meet f×tan(Semi-FOV)>6.0 mm; and the total effective focal length f of the camera lens group and an effective focal length f7 of the seventh lens meet 0.44/f7<1.2.

First claim

What is claimed is:

1. A camera lens group, sequentially comprising, from an object side to an image side along an optical axis, a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens with focal power, wherein
the first lens, the fourth lens, the sixth lens and the seventh lens have positive focal power;
the eighth lens has negative focal power;
a total effective focal length f of the camera lens group and a maximum Semi-Field of View (Semi-FOV) of the camera lens group meet f×tan(Semi-FOV)>6.0 mm; and
the total effective focal length f of the camera lens group and an effective focal length f7 of the seventh lens meet 0.4<f/f7<1.2;
an effective focal length f2 of the second lens and an effective focal length f5 of the fifth lens meet 0.5<f2/f5<1.2.

2. The camera lens group as claimed in claim 1 , wherein ImgH is a half of a diagonal length of an effective pixel region on an imaging surface of the camera lens group, TTL is a Total Track Length from an object-side surface of the first lens to the imaging surface of the camera lens group on the optical axis, and ImgH and TTL meet TTL/ImgH<1.6.

3. The camera lens group as claimed in claim 2 , wherein ImgH is the half of the diagonal length of the effective pixel region on the imaging surface of the camera lens group, TTL is the Total Track Length from the object-side surface of the first lens to the imaging surface of the camera lens group on the optical axis, and ImgH and TTL meet TTL/ImgH<1.4.

4. The camera lens group as claimed in claim 1 , wherein the total effective focal length f of the camera lens group and an effective focal length f1 of the first lens meet 0.8˜f/f1<1.2.

5. The camera lens group as claimed in claim 1 , wherein an effective focal length f3 of the third lens and an effective focal length f4 of the fourth lens meet 0.3<f/f3+f/f4<0.7.

6. The camera lens group as claimed in claim 1 , wherein an effective focal length f6 of the sixth lens and an effective focal length f8 of the eighth lens meet −0.8<f6/f8<−3.0.

7. The camera lens group as claimed in claim 1 , wherein the total effective focal length f of the camera lens group, an air space T67 of the sixth lens and the seventh lens on the optical axis and an air space T78 of the seventh lens and the eighth lens on the optical axis meet 2.5<f/(T67+T78)<6.

8. The camera lens group as claimed in claim 1 , wherein the total effective focal length f of the camera lens group and an air space T56 of the fifth lens and the sixth lens on the optical axis may meet 11<f/T56<18.

9. The camera lens group as claimed in claim 1 , wherein a minimum thickness ET7 min of the seventh lens in a direction parallel to the optical axis and a center thickness CT7 of the seventh lens on the optical axis meet 0.5<ET7 min/CT7<1.0.

10. The camera lens group as claimed in claim 1 , wherein a curvature radius R5 of an object-side surface of the third lens and a curvature radius R6 of an image-side surface of the third lens meet 0.45<R5/R6<1.2.

11. The camera lens group as claimed in claim 1 , wherein a curvature radius R3 of an object-side surface of the second lens and a curvature radius R4 of an image-side surface of the second lens meet 0<(R3−R4)/(R3+R4)<0.25.

12. The camera lens group as claimed in claim 1 , wherein the total effective focal length f of the camera lens group, a curvature radius R12 of the image-side surface of the sixth lens and a curvature radius R13 of the object-side surface of the seventh lens meet 0.5<f/|R12|+f/R13<2.0.

13. The camera lens group as claimed in claim 1 , wherein the total effective focal length f of the camera lens group and a curvature radius R15 of an object-side surface of the eighth lens meet −3.5<f/R15<−1.5.

14. The camera lens group as claimed in claim 1 , wherein TTL is a Total Track Length from an object-side surface of the first lens to the imaging surface of the camera lens group on the optical axis, TTL and an Entrance Pupil Diameter (EPD) of the camera lens group meet 2.1<TTL/EPD<2.5.

15. The camera lens group as claimed in claim 1 , wherein the total effective focal length f of the camera lens group, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis meet 5<f/(CT3+CT4+CT5)<9.

16. A camera lens group, sequentially comprising, from an object side to an image side along an optical axis, a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens with focal power, wherein
the first lens, the fourth lens, the sixth lens and the seventh lens have positive focal power;
the eighth lens has negative focal power,
both an image-side surface of the sixth lens and an object-side surface of the seventh lens are convex surfaces; and
a total effective focal length f of the camera lens group and a maximum Semi-Field of View (Semi-FOV) of the camera lens group meet f×tan(Semi-FOV)>6.0 mm;
an effective focal length f2 of the second lens and an effective focal length f5 of the fifth lens meet 0.5<f2/f5<1.2.

17. The camera lens group as claimed in claim 16 , wherein ImgH is a half of a diagonal length of an effective pixel region on an imaging surface of the camera lens group, TTL is a Total Track Length from an object-side surface of the first lens to the imaging surface of the camera lens group on the optical axis, and ImgH and TTL meet TTL/ImgH<1.6.

18. The camera lens group as claimed in claim 16 , wherein an effective focal length f6 of the sixth lens and an effective focal length f8 of the eighth lens meet −8.0<f6/f8<−3.0.

19. The camera lens group as claimed in claim 16 , wherein TTL is a Total Track Length from an object-side surface of the first lens to the imaging surface of the camera lens group on the optical axis, TTL and an Entrance Pupil Distance (EPD) of the camera lens group meet 2.1<TTL/EPD<2.5.

Assignees

• Zhejiang Sunny Optical Co Ltd

Inventors

• Dai Fujian
• Zhang Kaiyuan
• Zhang Yi
• Zhao Liefeng

Classifications

• G02B13/0045

  having five or more lenses · CPC title

• G02B9/64 Primary

  having more than six components · CPC title