Camera optical lens

1. A camera optical lens, comprising nine lenses, the nine lenses from an object side to an image side being:

a first lens with a negative refractive power;

a second lens with a positive refractive power;

a third lens with a positive refractive power;

a fourth lens with a positive refractive power;

a fifth lens with a negative refractive power;

a sixth lens with a negative refractive power;

a seventh lens with a positive refractive power;

an eighth lens with a positive refractive power; and

a ninth lens with a negative refractive power;

wherein the camera optical lens satisfies following conditions:

−5.50≤ f 1/ f≤− 2.00; 3.00≤ d 15/ d 16≤15.00;

where

f denotes a focal length of the camera optical lens;

f1 denotes a focal length of the first lens;

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

d16 denotes an on-axis distance from an image-side surface of the eighth lens to an object-side surface of the ninth lens.

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

1.50≤ f 2/ f≤ 4.50;

where f2 denotes a focal length of the second lens.

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

2.10≤( R 1+ R 2)/( R 1− R 2)≤14.14; 0.01≤ d 1/ TTL≤ 0.04;

where

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;

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

TTL denotes a total track length of the camera optical lens.

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

−16.98≤( R 3+ R 4)/( R 3− R 4)≤−2.69; 0.01≤ d 3/ TTL≤ 0.06;

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;

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

TTL denotes a total track length of the camera optical lens.

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

0.28≤ f 3/ f≤ 0.85; 0.11≤( R 5+ R 6)/( R 5− R 6)≤0.33; 0.02≤ d 5/ TTL≤ 0.06;

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;

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

TTL denotes a total track length of the camera optical lens.

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

26.56≤ f 4/ f≤ 91.14; 10.71≤( R 7+ R 8)/( R 7− R 8)≤34.57; 0.02≤ d 7/ TTL≤ 0.06;

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;

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

TTL denotes a total track length of the camera optical lens.

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

−2.41≤ f 5/ f≤− 0.80; 0.40≤( R 9+ R 10)/( R 9− R 10)≤1.28; 0.02≤ d 9/ TTL≤ 0.05;

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;

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

TTL denotes a total track length of the camera optical lens.

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

−2.86≤ f 6/ f≤− 0.93; −2.09≤( R 11+ R 12)/( R 11− R 12)≤−0.68; 0.02≤ d 11/ TTL≤ 0.05;

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;

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

TTL denotes a total track length of the camera optical lens.

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

0.54≤ f 7/ f≤ 1.63; 0.39≤( R 13+ R 14)/( R 13− R 14)≤1.18; 0.03≤ d 13/ TTL≤ 0.08;

where

f7 denotes a focal length of the seventh lens;

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

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

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

TTL denotes a total track length of the camera optical lens.

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

3.55≤ f 8/ f≤ 13.35; 3.05≤( R 15+ R 16)/( R 15− R 16)≤13.06; 0.07≤ d 15/ TTL≤ 0.25;

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 the image-side surface of the eighth lens;

TTL denotes a total track length of the camera optical lens.

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

−1.55≤ f 9/ f≤− 0.51; 0.06≤( R 17+ R 18)/( R 17− R 18)≤0.36; 0.02≤ d 17/ TTL≤ 0.05;

where

f9 denotes a focal length of the ninth lens;

R17 denotes a central curvature radius of the object-side surface of the ninth lens;

R18 denotes a central curvature radius of an image-side surface of the ninth lens;

d17 denotes an on-axis thickness of the ninth lens;

TTL denotes a total track length of the camera optical lens.