Camera optical lens

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

a first lens having a positive refractive power;

a second lens having a negative refractive power;

a third lens having a positive refractive power;

a fourth lens having a negative refractive power;

a fifth lens having a negative 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 following conditions:

2.00≤ f 1/ f≤ 3.40;

f 2≤0.00; and

1.55≤ n 6≤1.70,

where

f denotes a focal length of the camera optical lens;

f1 denotes a focal length of the first lens;

f2 denotes a focal length of the second lens; and

n6 denotes a refractive index of the sixth lens.

2. The camera optical lens as described in claim 1 , further satisfying a following condition:

−12.00≤( R 1+ R 2)/( R 1− R 2)≤−5.00,

where

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

R2 denotes a curvature radius of an image side surface of the first lens.

3. The camera optical lens as described in claim 1 , further satisfying a following condition:

−16.00≤ f 5/ f≤− 3.50,

where

f5 denotes a focal length of the fifth lens.

4. The camera optical lens as described in claim 1 , further satisfying a following condition:

0.04 ≤d 1 /TTL≤ 0.14,

where

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

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

5. The camera optical lens as described in claim 1 , further satisfying following conditions:

−107.35≤ f 2/ f≤− 6.91;

6.68≤( R 3+ R 4)/( R 3− R 4)≤71.83; and

0.02≤ d 3/ TTL≤ 0.05,

where

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

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

d3 denotes an on-axis thickness of the second lens; and

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

6. The camera optical lens as described in claim 1 , further satisfying following conditions:

0.56≤ f 3/ f≤ 1.98;

−0.73≤( R 5+ R 6)/( R 5− R 6)≤−0.07; and

0.03≤ d 5/ TTL≤ 0.11,

where

f3 denotes a focal length of the third lens;

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; and

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

7. The camera optical lens as described in claim 1 , further satisfying following conditions:

−8.79≤ f 4/ f≤− 1.71;

0.72≤( R 7+ R 8)/( R 7− R 8)≤6.20; and

0.02≤ d 7/ TTL≤ 0.06,

where

f4 denotes a focal length of the fourth lens;

R7 denotes a curvature radius of an 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; and

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

8. The camera optical lens as described in claim 1 , further satisfying following conditions:

0.04≤( R 9+ R 10)/( R 9− R 10)≤21.31; and

0.02≤ d 9/ TTL≤ 0.06,

where

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

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

d9 denotes an on-axis thickness of the fifth lens; and

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

9. The camera optical lens as described in claim 1 , further satisfying following conditions:

−24.00≤ f 6/ f≤− 3.72;

0.52≤( R 11+ R 12)/( R 11− R 12)≤24.48; and

0.03≤ d 11/ TTL≤ 0.09,

where

f6 denotes a focal length of the sixth lens;

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

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

d11 denotes an on-axis thickness of the sixth lens; and

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

10. The camera optical lens as described in claim 1 , further satisfying following conditions:

0.53≤ f 7/ f≤ 1.68;

−4.00≤( R 13+ R 14)/( R 13− R 14)≤−0.98; and

0.05≤ d 13/ TTL≤ 0.17,

where

f7 denotes a focal length of the seventh lens;

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

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

d13 denotes an on-axis thickness of the seventh lens; and

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

11. The camera optical lens as described in claim 1 , further satisfying following conditions:

−1.67≤ f 8/ f≤− 0.51;

0.03≤ d 15/ TTL≤ 0.10; and

−2.56≤( R 15+ R 16)/( R 15− R 16)≤−0.40,

where

f8 denotes a focal length of the eighth lens;

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

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

d15 denotes an on-axis thickness of the eighth lens; and

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