Optical imaging lens assembly including eight lenses of +-++--+- or +---+-+- refractive powers

1. An optical imaging lens assembly, sequentially from an object side to an image side of the optical imaging lens assembly along an optical axis, comprising:

a first lens having positive refractive power with a convex object-side surface and a concave image-side surface;

a second lens having negative refractive power with a concave image-side surface;

a third lens having refractive power with a convex object-side surface and a concave image-side surface;

a fourth lens having refractive power;

a fifth lens having refractive power;

a sixth lens having refractive power;

a seventh lens having positive refractive power with a convex object-side surface; and

an eighth lens having negative refractive power with a concave object-side surface and a concave image-side surface,

wherein 5.80 mm<ImgH,

TTL/ImgH<1.10, and

1.00<f7/f<2.00,

where ImgH is half of a diagonal length of an effective pixel area on an imaging plane of the optical imaging lens assembly, TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane of the optical imaging lens assembly, f7 is an effective focal length of the seventh lens, and f is a total effective focal length of the optical imaging lens assembly.

2. The optical imaging lens assembly according to claim 1 , wherein 0.50<R 16 /R 13 <2.00,

where R 13 is a radius of curvature of the object-side surface of the seventh lens, and R 16 is a radius of curvature of the image-side surface of the eighth lens.

3. The optical imaging lens assembly according to claim 1 , wherein 1.00<R 2 /f<3.50,

where R 2 is a radius of curvature of the image-side surface of the first lens, and f is the total effective focal length of the optical imaging lens assembly.

4. The optical imaging lens assembly according to claim 1 , wherein 2.00<CT 4 /T 45 <5.00,

where CT 4 is a center thickness of the fourth lens along the optical axis, and T 45 is a spaced interval between the fourth lens and the fifth lens along the optical axis.

5. The optical imaging lens assembly according to claim 1 , wherein 2.00<(R 4 +R 2 )/(R 2 -R 4 )<5.00,

where R 2 is a radius of curvature of the image-side surface of the first lens, and R 4 is a radius of curvature of the image-side surface of the second lens.

6. The optical imaging lens assembly according to claim 1 , wherein 9.00<(SAG62+SAG61)/(SAG62-SAG61)<20.00,

where SAG61 is an on-axis distance from an intersection of an object-side surface of the sixth lens and the optical axis to a vertex of an effective radius of the object-side surface of the sixth lens, and SAG62 is an on-axis distance from an intersection of an image-side surface of the sixth lens and the optical axis to a vertex of an effective radius of the image-side surface of the sixth lens.

7. The optical imaging lens assembly according to claim 1 , wherein 0.74<DT 82 /ImgH,

where DT 82 is a maximum effective radius of the image-side surface of the eighth lens.

8. The optical imaging lens assembly according to claim 1 , wherein ΣAT/TD<0.40,

where ΣAT is a sum of spaced intervals along the optical axis between each two adjacent lenses of the first lens to the eighth lens, and TD is a distance along the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens.

9. The optical imaging lens assembly according to claim 1 , wherein the optical imaging lens assembly further comprises a stop disposed between the object side and the first lens.

10. The optical imaging lens assembly according to claim 1 , wherein

3.00<(CT5+CT 7 )/(CT 7 -CT 5 )<7.00,

where CT 5 is a center thickness of the fifth lens along the optical axis, and CT 7 is a center thickness of the seventh lens along the optical axis.

11. The optical imaging lens assembly according to claim 10 , wherein 0.50<R 16 /R 13 <2.00,

where R 13 is a radius of curvature of the object-side surface of the seventh lens, and R 16 is a radius of curvature of the image-side surface of the eighth lens.

12. The optical imaging lens assembly according to claim 10 , wherein 1.00<R 2 /f<3.50,

where R 2 is a radius of curvature of the image-side surface of the first lens, and f is a total effective focal length of the optical imaging lens assembly.

13. The optical imaging lens assembly according to claim 10 , wherein 2.00<CT 4 /T 45 <5.00,

where CT 4 is a center thickness of the fourth lens along the optical axis, and T 45 is a spaced interval between the fourth lens and the fifth lens along the optical axis.

14. The optical imaging lens assembly according to claim 10 , wherein 2.00<(R 4 +R 2 )/(R 2 -R 4 )<5.00,

where R 2 is a radius of curvature of the image-side surface of the first lens, and R 4 is a radius of curvature of the image-side surface of the second lens.

15. The optical imaging lens assembly according to claim 10 , wherein 9.00<(SAG62+SAG61)/(SAG62-SAG61)<20.00,

where SAG61 is an on-axis distance from an intersection of an object-side surface of the sixth lens and the optical axis to a vertex of an effective radius of the object-side surface of the sixth lens, and SAG62 is an on-axis distance from an intersection of an image-side surface of the sixth lens and the optical axis to a vertex of an effective radius of the image-side surface of the sixth lens.

16. The optical imaging lens assembly according to claim 10 , wherein 0.74<DT 82 /ImgH,

where DT 82 is a maximum effective radius of the image-side surface of the eighth lens.

17. The optical imaging lens assembly according to claim 10 , wherein ΣAT/TD <0.40,

where ΣAT is a sum of spaced intervals along the optical axis between each two adjacent lenses of the first lens to the eighth lens, and TD is a distance along the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens.

18. The optical imaging lens assembly according to claim 10 , wherein the optical imaging lens assembly further comprises a stop disposed between the object side and the first lens.