Camera optical lens

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

a first lens having positive refractive power;

a second lens having negative refractive power;

a third lens having positive refractive power;

a fourth lens having positive refractive power;

a fifth lens having negative refractive power;

a sixth lens having negative refractive power;

a seventh lens having negative refractive power;

an eighth lens having positive refractive power; and

a ninth lens having negative refractive power,

wherein the camera optical lens satisfies the following conditions:

2.00≤ f 1/ f≤ 5.50;

1.00≤( R 17+ R 18)/( R 17− R 18)≤3.50; and

1.50≤ d 15/ d 16≤9.00,

where

f denotes a focal length of the camera optical lens;

f1 denotes a focal length of the first lens;

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

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

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

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 as described in claim 1 , wherein the camera optical lens satisfies the following conditions:

−35.14≤( R 1+ R 2)/( R 1− R 2)≤−3.11; and

0.02≤ d 1/ TTL≤ 0.08,

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; and

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

3. The camera optical lens as described in claim 1 , wherein the camera optical lens satisfies the following conditions:

−8.12≤ f 2/ f≤− 2.48;

2.14≤( R 3+ R 4)/( R 3− R 4)≤10.66; and

0.01≤ d 3/ TTL≤ 0.05,

where

f2 denotes a focal length of the second lens;

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; 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.

4. The camera optical lens as described in claim 1 , wherein the camera optical lens satisfies the following conditions:

0.48≤ f 3/ f≤ 1.83;

−1.30≤( R 5+ R 6)/( R 5− R 6)≤−0.16; and

0.03≤ 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;

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.

5. The camera optical lens as described in claim 1 , wherein the camera optical lens satisfies the following conditions:

2.22≤ f 4/ f≤ 10.54;

−12.60≤( R 7+ R 8)/( R 7− R 8)≤−2.54; and

0.02≤ d 7/ TTL≤ 0.05,

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; 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 , wherein the camera optical lens satisfies the following conditions:

−8.56≤ f 5/ f≤− 2.36;

2.19≤( R 9+ R 10)/( R 9− R 10)≤8.15; and

0.01≤ d 9/ TTL≤ 0.03,

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; 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 , wherein the camera optical lens satisfies the following conditions:

−21.54≤ f 6/ f≤− 4.42;

2.09≤( R 11+ R 12)/( R 11− R 12)≤20.04; and

0.02≤ d 11/ TTL≤ 0.08,

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; 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 , wherein the camera optical lens satisfies the following conditions:

−45.71≤ f 7/ f≤− 5.01;

4.48≤( R 13+ R 14)/( R 13− R 14)≤33.29; and

0.03≤ d 13/ TTL≤ 0.09,

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; 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 , wherein the camera optical lens satisfies the following conditions:

0.36≤ f 8/ f≤ 2.87;

−6.01≤( R 15+ R 16)/( R 15− R 16)≤0.37; and

0.07≤ d 15/ TTL≤ 0.24,

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; 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 , wherein the camera optical lens satisfies the following conditions:

−2.21≤ f 9/ f≤− 0.35; and

0.02≤ d 17/ TTL≤ 0.09,

where

f9 denotes a focal length of the ninth lens;

d17 denotes an on-axis thickness of the ninth 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.