Optical imaging lens group

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

a first prism has a first reflective surface;

a first lens has a refractive power, and an object-side surface thereof is a convex surface;

a second lens has a refractive power;

a third lens has a refractive power, an object-side surface thereof is a concave surface and an image-side surface thereof is a convex surface;

a fourth lens has a refractive power;

a fifth lens has a refractive power; and

a second prism has a second reflective surface; and

an optical distortion Dist. of the optical imaging lens group satisfies: |Dist.|<0.1%;

a combined focal length f12 of the first lens and the second lens and an effective focal length f4 of the fourth lens satisfy: −0.7<f4/f12<−0.2.

2. 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, Semi-FOV and a combined focal length f34 of the third lens and the fourth lens satisfy: −1.3 mm<f34*tan (Semi-FOV)<−0.3 mm.

3. The optical imaging lens group according to claim 1 , wherein a curvature radius R1 of the object-side surface of the first lens and a total effective focal length f of the optical imaging lens group satisfy: 0.2<R1/f<0.7.

4. The optical imaging lens group according to claim 1 , wherein a curvature radius R9 of an object-side surface of the fifth lens, a curvature radius R10 of an image-side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy: −0.7<(R9+R10)/f5<−0.2.

5. The optical imaging lens group according to claim 1 , wherein SAG32 is a distance from an intersection point of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens on the optical axis, and SAG52 is a distance from an intersection point of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens on the optical axis, SAG32 and SAG52 satisfy: −1.0<SAG32/SAG52<−0.5.

6. The optical imaging lens group according to claim 1 , wherein an edge thickness ET1 of the first lens and an edge thickness ET3 of the third lens satisfy: 0.3<ET1/ET3<0.8.

7. The optical imaging lens group according to claim 1 , wherein an edge thickness ET4 of the fourth lens and an edge thickness ET5 of the fifth lens satisfy: 0.3<ET5/(ET4+ET5)<0.8.

8. The optical imaging lens group according to claim 1 , wherein a curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens satisfy: 0.5<R5/R6<1.0.

9. The optical imaging lens group according to claim 1 , wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, 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 satisfy: 0.5<(CT2+CT4)/(CT1+CT3+CT5)<1.5.

10. The optical imaging lens group according to claim 1 , wherein a spacing distance T12 between the first lens and the second lens on the optical axis and a spacing distance T23 between the second lens and the third lens on the optical axis satisfy: 0.2<T12/T23<0.7.

11. The optical imaging lens group according to claim 1 , wherein the fourth lens has a positive refractive power.

12. The optical imaging lens group according to claim 1 , wherein the fifth lens has a negative refractive power, an object-side surface thereof is a convex surface, and an image-side surface thereof is a concave surface.

13. An optical imaging lens group, sequentially comprising from an object side to an image side along an optical axis:

a first prism has a first reflective surface;

a first lens has a refractive power;

a second lens has a refractive power;

a third lens has a refractive power;

a fourth lens has a positive refractive power;

a fifth lens has a negative refractive power, an object-side surface thereof is a convex surface and an image-side surface thereof is a concave surface; and

a second prism has a second reflective surface; and

an optical distortion Dist. of the optical imaging lens group satisfies: |Dist.|<0.1%;

a combined focal length f12 of the first lens and the second lens and an effective focal length f4 of the fourth lens satisfy: −0.7<f4/f12<−0.2.

14. The optical imaging lens group according to claim 13 , wherein Semi-FOV is half of a maximum field of view of the optical imaging lens group, Semi-FOV and a combined focal length f34 of the third lens and the fourth lens satisfy: −1.3 mm<f34*tan (Semi-FOV)<−0.3 mm.

15. The optical imaging lens group according to claim 13 , wherein a curvature radius R1 of the object-side surface of the first lens and a total effective focal length f of the optical imaging lens group satisfy: 0.2<R1/f<0.7.

16. The optical imaging lens group according to claim 13 , wherein a curvature radius R9 of an object-side surface of the fifth lens, a curvature radius R10 of an image-side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy: −0.7<(R9+R10)/f5<−0.2.

17. The optical imaging lens group according to claim 13 , wherein SAG32 is a distance from an intersection point of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens on the optical axis, and SAG52 is a distance from an intersection point of the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens on the optical axis, SAG32 and SAG52 satisfy: −1.0<SAG32/SAG52<−0.5.

18. The optical imaging lens group according to claim 13 , wherein an edge thickness ET1 of the first lens and an edge thickness ET3 of the third lens satisfy: 0.3<ET1/ET3<0.8.