Optical imaging lens assembly
The present disclosure discloses an optical imaging lens assembly. The optical imaging lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially arranged from an object side to an image side along an optical axis. The first lens, the second lens, the fifth lens, the seventh lens, and the eighth lens may respectively have a positive focal power or a negative focal power. A combined focal power of the third lens and the fourth lens is a positive focal power. The sixth lens may have a positive focal power. An effective focal length f of the optical imaging lens assembly and a combined focal length f34 of the third lens and the fourth lens satisfy: 0.5≤f/f34<1.0.
1. An optical imaging lens assembly, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially arranged from an object side to an image side along an optical axis,
wherein each of the first lens, the second lens, the fifth lens, the seventh lens, and the eighth lens has a positive focal power or a negative focal power;
a combined focal power of the third lens and the fourth lens is a positive focal power;
the sixth lens has a positive focal power; and
an effective focal length f of the optical imaging lens assembly and a combined focal length f34 of the third lens and the fourth lens satisfy: 0.5≤f/f34<1.0.
2. The optical imaging lens assembly according to claim 1 , wherein the third lens has a positive focal power and the fourth lens has a negative focal power.
3. The optical imaging lens assembly according to claim 2 , wherein a radius R7 of curvature of an object-side surface of the fourth lens and a radius R8 of curvature of an image-side surface of the fourth lens satisfy: 0<(R7−R8)/(R7+R8)<1.0.
4. The optical imaging lens assembly according to claim I, wherein an optical-axis distance TTL from an object-side surface of the first lens to an image plane of the optical imaging lens assembly and a half of a diagonal length ImgH of an effective pixel area on the image plane of the optical imaging lens assembly satisfy: TTL/ImgH≤1.7.
5. The optical imaging lens assembly according to claim 1 , wherein the effective focal length f of the optical imaging lens assembly and a combined focal length f12 of the first lens and the second lens satisfy: 0<f/f12<0.5.
6. The optical imaging lens assembly according to claim 1 , wherein the effective focal length f of the optical imaging lens assembly and an effective focal length f1 of the first lens satisfy: |f/f1|≤0.1.
7. The optical imaging lens assembly according to claim 1 , wherein a radius R3 of curvature of an object-side surface of the second lens and a radius R4 of curvature of an image-side surface of the second lens satisfy: 0.6<R3/R4<1.2.
8. The optical imaging lens assembly according to claim 1 , wherein a center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 0.5<CT2/CT3<0.8.
9. The optical imaging lens assembly according to claim 1 , wherein the effective focal length f of the optical imaging lens assembly and an effective focal length f5 of the fifth lens satisfy: |f/f5|≤0.1.
10. The optical imaging lens assembly according to claim I, wherein a center thickness CT6 of the sixth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy: 0.7<CT6/CT7<1.2.
11. The optical imaging lens assembly according to claim 1 , wherein the effective focal length f of the optical imaging lens assembly and a combined focal length f78 of the seventh lens and the eighth lens satisfy: −0.5<f/f78<0.
12. The optical imaging lens assembly according to claim 1 , wherein the effective focal length f of the optical imaging lens assembly and an entrance pupil diameter EPD of the optical imaging lens assembly satisfy: f/EPD≤1.8.
13. An optical imaging lens assembly, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an. eighth lens, sequentially arranged from an object side to an image side along an optical axis,
wherein each of the first lens, the second lens, and the fifth lens has a positive focal power or a negative focal power;
each of the third lens and the sixth lens has a positive focal power;
the fourth lens has a negative focal power;
a combined focal power of the seventh lens and the eighth lens is a negative focal power; and
an effective focal length f of the optical imaging lens assembly and a combined focal length f78 of the seventh lens and the eighth lens satisfy: −0.5<f/f78<0.
14. The optical imaging lens assembly according to claim 13 , wherein at least one of the seventh lens and the eighth lens has a negative focal power.
15. The optical imaging lens assembly according to claim 13 , wherein a combined focal power of the third lens and the fourth. lens is a positive focal power.
16. The optical imaging lens assembly according to claim 13 , wherein an optical-axis distance TTL from an object-side surface of the first lens to an image plane of the optical imaging lens assembly and a half of a diagonal length ImgH of an effective pixel area on the image plane of the optical imaging lens assembly satisfy: TTL/ImgH≤1.7.
17. The optical imaging lens assembly according to claim 16 , wherein the effective focal length f of the optical imaging lens assembly and an entrance pupil diameter EPD of the optical imaging lens assembly satisfy: f/EPD≤1.8.
18. The optical imaging lens assembly according to claim 17 , wherein the effective focal length f of the optical imaging lens assembly and an effective focal length f6 of the sixth lens satisfy: 0<f/f6<0.5.
19. The optical imaging lens assembly according to claim 17 , wherein the effective focal length f of the optical imaging lens assembly and an effective focal length f5 of the fifth lens satisfy: |f/f5|≤0.1.
20. The optical imaging lens assembly according to claim 17 , wherein the effective focal length f of the optical imaging lens assembly and a radius R11 of curvature of an object-side surface of the sixth lens satisfy: 0.5<f/R11<1.0.
21. The optical imaging lens assembly according to claim 17 , wherein a center thickness CT6 of the sixth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy: 0.7<CT6/CT7<1.2.
22. The optical imaging lens assembly according to claim 17 , wherein a radius R13 of curvature of an object-side surface of the seventh lens and a radius R14 of curvature of an image-side surface of the seventh lens satisfy: |(R13−R14)/(R13+R14)|≤0.5.
23. The optical imaging lens assembly according to claim 17 , wherein a radius R15 of curvature of an object-side surface of the eighth lens and a radius R16 of curvature of an image-side surface of the eighth lens satisfy: 1≤R15/R16<1.5.