Camera optical lens including seven lenses of ++−+−+−, ++−+++− or ++−−−+− refractive powers

1. A camera optical lens comprising, from an object side to an image side:

a first lens;

a second lens;

a third lens;

a fourth lens;

a fifth lens;

a sixth lens; and

a seventh lens;

wherein the camera optical lens satisfies following conditions:

1.51≤ f 1/ f≤ 2.50;

1.70≤ n 1≤2.20;

−2.00≤ f 3/ f 4≤2.00;

−3.88≤ f 4/ f≤ 7.25;

−2.69≤( R 7+ R 8)/( R 7− R 8)≤5.62;

0.05≤ d 7/ TTL≤ 0.13;

2.50≤( R 13+ R 14)/( R 13− R 14)≤10.01; and

1.70≤ n 7≤2.20;

where

f denotes a focal length of the camera optical lens;

f1 denotes a focal length of the first lens;

f3 denotes a focal length of the third lens;

f4 denotes a focal length of the fourth lens;

n1 denotes a refractive index of the first lens;

n7 denotes a refractive index of the seventh lens;

R7 denotes a curvature radius of the object-side surface of the fourth lens;

R8 denotes a curvature radius of an image-side surface of the fourth lens;

d7 denotes an on-axis thickness of the fourth lens;

R13 denotes a curvature radius of an object-side surface of the seventh lens; and

R14 denotes a curvature radius of an image-side surface of the seventh lens.

2. The camera optical lens according to claim 1 further satisfying following conditions:

1.71≤ n 1≤2.16; and

1.71≤ n 7≤2.16.

3. The camera optical lens according to claim 1 , wherein the first lens has a positive refractive power, and comprises an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region; and

the camera optical lens further satisfies following conditions:

−12.49≤( R 1+ R 2)/( R 1− R 2)≤−1.62; and

0.03≤ d 1/ TTL≤ 0.11;

where

R1 denotes a curvature radius of the object-side surface of the first lens;

R2 denotes a curvature radius of the image-side surface of the first lens;

d1 denotes an on-axis thickness of the first lens; and

TTL donates a total optical length from an object side surface of the first lens to an image surface of the camera optical lens along an optical axis.

4. The camera optical lens according to claim 3 further satisfying following conditions:

−7.81≤( R 1+ R 2)/( R 1− R 2)≤−2.03; and

0.05≤ d 1/ TTL≤ 0.09.

5. The camera optical lens according to claim 1 , wherein the second lens has a positive refractive power and comprises an object-side surface being convex in a paraxial region; and

the camera optical lens further satisfies following conditions:

0.87≤ f 2/ f≤ 9.46;

−4.01≤( R 3+ R 4)/( R 3− R 4)≤0.21; and

0.05≤ d 3/ TTL≤ 0.19;

where

f2 denotes a focal length of the second lens;

R3 denotes a curvature radius of the object-side surface of the second lens;

R4 denotes a curvature radius of an image-side surface of the second lens; and

d3 denotes an on-axis thickness of the second lens.

6. The camera optical lens according to claim 5 further satisfying following conditions:

1.39≤ f 2/ f≤ 7.57;

−2.51≤( R 3+ R 4)/( R 3− R 4)≤0.17; and

0.08≤ d 3/ TTL≤ 0.15.

7. The camera optical lens according to claim 1 , wherein the third lens has a negative refractive power, and

the camera optical lens further satisfies following conditions:

−12.41≤ f 3/ f≤− 1.30;

−18.01≤( R 5+ R 6)/( R 5− R 6)≤5.53; and

0.02≤ d 5/ TTL≤ 0.07;

where

R5 denotes a curvature radius of an object-side surface of the third lens;

R6 denotes a curvature radius of an image-side surface of the third lens;

d5 denotes an on-axis thickness of the third lens.

8. The camera optical lens according to claim 7 further satisfying following conditions:

−7.75≤ f 3/ f≤− 1.63;

−11.26≤( R 5+ R 6)/( R 5− R 6)≤4.42; and

0.03≤ d 5/ TTL≤ 0.06.

9. The camera optical lens according to claim 1 , wherein the fifth lens has a refractive power, and comprises an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region; and

the camera optical lens further satisfies following conditions:

−5.03≤ f 5/ f≤ 13.07;

−11.35≤( R 9+ R 10)/( R 9− R 10)≤23.88; and

0.02≤ d 9/ TTL≤ 0.12;

where

f5 denotes a focal length of the fifth lens;

R9 denotes a curvature radius of the object-side surface of the fifth lens;

R10 denotes a curvature radius of the image-side surface of the fifth lens;

d9 denotes an on-axis thickness of the fifth lens.

10. The camera optical lens according to claim 9 further satisfying following conditions:

−3.14≤ f 5/ f≤ 10.45;

−7.09≤( R 9+ R 10)/( R 9− R 10)≤19.10; and

0.04≤ d 9/ TTL≤ 0.10.

11. The camera optical lens according to claim 1 , wherein the sixth lens has a positive refractive power, and comprises an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region, and

the camera optical lens further satisfies following conditions:

0.17≤ f 6/ f≤ 4.46;

−13.67≤( R 11+ R 12)/( R 11− R 12)≤−2.10; and

0.04≤ d 11/ TTL≤ 0.15;

where

f6 denotes a focal length of the sixth lens;

R11 denotes a curvature radius of the object-side surface of the sixth lens;

R12 denotes a curvature radius of the image-side surface of the sixth lens;

d11 denotes an on-axis thickness of the sixth lens.

12. The camera optical lens according to claim 11 further satisfying following conditions:

0.28≤ f 6/ f≤ 3.57;

−8.55≤( R 11+ R 12)/( R 11− R 12)≤−2.62; and

0.07≤ d 11/ TTL≤ 0.12.

13. The camera optical lens according to claim 1 , wherein the seventh lens has a negative refractive power, and comprises an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region, and

the camera optical lens further satisfies following conditions:

−20.97≤ f 7/ f≤− 0.90; and

0.06≤ d 13/ TTL≤ 0.20;

where

f7 denotes a focal length of the seventh lens;

d13 denotes an on-axis thickness of the seventh lens.

14. The camera optical lens according to claim 13 further satisfying following condition:

−13.10≤ f 7/ f≤− 1.12; and

0.10≤ d 13/ TTL≤ 0.16.

15. The camera optical lens according to claim 1 , where a total optical length TTL from the object-side surface of the first lens to an image surface of the camera optical lens along an optical axis is less than or equal to 5.99 mm.

16. The camera optical lens according to claim 15 , wherein the total optical length TTL of the camera optical lens is less than or equal to 5.72 mm.

17. The camera optical lens according to claim 1 , wherein an F number of the camera optical lens is less than or equal to 1.65.

18. The camera optical lens according to claim 17 , wherein the F number of the camera optical lens is less than or equal to 1.62.