Optical imaging lens
The disclosure discloses an optical imaging lens, which sequentially includes, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power, the fourth lens has positive refractive power, and the seventh lens has negative refractive power. A total effective focal length f of the optical imaging lens and a maximum Field Of View (FOV) of the optical imaging lens meet f×tan(FOV/2)?5.5 mm. An effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens meet 1.3≤f4/f6<4.5.
1. An optical imaging lens, sequentially comprising, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein
the first lens has positive refractive power, the fourth lens has positive refractive power, and the seventh lens has negative refractive power;
a total effective focal length f of the optical imaging lens and a maximum Field Of View (FOV) of the optical imaging lens meet f×tan(FOV/2)≥5.5 mm; and
an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens meet 1.3≤f4/f6≤4.5;
a curvature radius R11 of an object-side surface of the sixth lens and a curvature radius R12 of an image-side surface of the sixth lens meet 0.95≤R12/R11<4.0.
2. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens and a center thickness CT6 of the sixth lens on the optical axis meet 9≤f/CT6<15.
3. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens and a curvature radius R8 of an image-side surface of the fourth lens meet −1.5<f/R8<0.
4. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens and a curvature radius R5 of an object-side surface of the third lens meet −1.0<f/R5<0.1.
5. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens and an effective focal length f1 of the first lens meet 1<f/f≤1.3.
6. The optical imaging lens according to claim 1 , wherein an effective focal length f2 of the second lens and an effective focal length f7 of the seventh lens meet 1.5<f2/f7<3.2.
7. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens, an effective focal length f3 of the third lens and an effective focal length f5 of the fifth lens meet 0.25≤f/|f3|+f/|f5|0.5.
8. The optical imaging lens according to claim 1 , wherein a refractive index N4 of the fourth lens, a refractive index N5 of the fifth lens and a refractive index N6 of the sixth lens meet 1.5<(N4+N5+N6)/3≤1.6; and
an Abbe number V5 of the fifth lens and an Abbe number V6 of the sixth lens meet 15<V6−V5≤20.
9. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of an image-side surface of the first lens meet 0.5≤f/(R2−R1)≤1.0.
10. The optical imaging lens according to 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 2.0<(R3+R4)/(R3−R4)<4.0.
11. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens, a curvature radius R9 of an object-side surface of the fifth lens and a curvature radius R10 of an image-side surface of the fifth lens meet −1.0<f/R9−f/R10<0.
12. The optical imaging lens according to claim 1 , wherein a separation distance T34 of the third lens and the fourth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis meet T34/T45≤50.5; and
the separation distance T45 of the fourth lens and the fifth lens on the optical axis and a separation distance T56 of the fifth lens and the sixth lens on the optical axis meet 0.5<T45/T56<3.0.
13. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens and the effective focal length f2 of the second lens meet − 0 . 6 ≤f/f2≤−0.4.
14. The optical imaging lens according to claim 1 , wherein the total effective focal length f of the optical imaging lens and the effective focal length f7 of the seventh lens meet − 1 . 3 ≤f/f7≤−1.0.
15. The optical imaging lens according to claim 1 , wherein TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical imaging lens on the optical axis and ImgH is a half of a diagonal length of an effective pixel region on the imaging surface meet TTL/ImgH<1.5.