Camera optical lens

1. A camera optical lens comprising eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, a seventh lens having a positive refractive power, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions:

0.95 ≤f/TTL;

−4.50 ≤f 2 /f ≤−1.90; and

0.30≤( R 13 +R 14)/( R 13 −R 14)≤1.00;

where

f denotes a focal length of the camera optical lens;

TTL denotes 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;

f2 denotes a focal length of the second lens;

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

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

2. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following condition:

3.50≤ d 5/ d 6≤20.00;

where

d5 denotes an on-axis thickness of the third lens; and

d6 denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of the fourth lens.

3. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

0.36 ≤f 1 /f ≤1.16;

−3.15≤( R 1 +R 2)/( R 1 −R 2)≤−0.96; and

0.05 ≤d 1 /TTL ≤0.20;

where

f1 denotes a focal length of the first lens;

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

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

d1 denotes an on-axis thickness of the first lens.

4. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

0.80≤( R 3 +R 4)/( R 3 −R 4)≤3.90; and

0.02 ≤d 3 /TTL ≤0.08;

where

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

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

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

5. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

−6.56 ≤f 3 /f ≤−1.33;

0.39≤( R 5 +R 6)/( R 5 −R 6)≤3.52; and

0.04 ≤d 5 /TTL ≤0.12;

where

f3 denotes a focal length of the third lens;

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

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

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

6. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

1.05 ≤f 4 /f ≤3.36;

−3.32≤( R 7 +R 8)/( R 7 −R 8)≤−0.97; and

0.02 ≤d 7 /TTL ≤0.08;

where

f4 denotes a focal length of the fourth lens;

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

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

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

7. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

1.01 ≤f 5 /f ≤3.73;

0.38≤( R 9 +R 10)/( R 9 −R 10)≤2.26; and

0.04 ≤d 9 /TTL ≤0.14;

where

f5 denotes a focal length of the fifth lens;

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

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

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

8. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

−28.44 ≤f 6 /f ≤−1.73;

3.34≤( R 11 +R 12)/( R 11 −R 12)≤30.28; and

0.01 ≤d 11 /TTL ≤0.04;

where

f6 denotes a focal length of the sixth lens;

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

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

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

9. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

2.18 ≤f 7 /f ≤9.49; and

0.01 ≤d 13 /TTL ≤0.04;

where

f7 denotes a focal length of the seventh lens; and

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

10. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

−1.84 ≤f 8 /f ≤−0.49;

0.25≤( R 15 +R 16)/( R 15 −R 16)≤0.91; and

0.01 ≤d 15 /TTL ≤0.04;

where

f8 denotes a focal length of the eighth lens;

R15 denotes a central curvature radius of an object-side surface of the eighth lens;

R16 denotes a central curvature radius of an image-side surface of the eighth lens; and

d15 denotes an on-axis thickness of the eighth lens.

11. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:

f /IH≥2.18;

where IH denotes an image height of the camera optical lens.