Camera optical lens

1. A camera optical lens comprising eight lenses which are, 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 positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power and an eighth lens having a negative refractive power;

wherein the camera optical lens satisfies following conditions:

0.95≤ f/TTL;

0.70≤ f 1/ f≤ 2.49;

−10.16≤( R 1+ R 2)/( R 1− R 2)≤−2.83;

0.05≤ d 1/ TTL≤ 0.15;

−3.50≤ f 2/ f≤− 1.80;

3.00≤( R 9+ R 10)/( R 9− R 10)≤30.00; and

1.50≤ d 10/ d 9≤3.00; and

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;

f1 denotes a focal length of the first lens,

R1 denotes a central curvature radius of the 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;

f2 denotes a focal length of the second lens;

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

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

d10 denotes an on-axis distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens.

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

3.00≤( R 3+ R 4)/( R 3− R 4)≤17.99; and

0.02≤ d 3/ TTL≤ 0.05;

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.

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

0.55≤ f 3/ f≤ 1.74;

−3.42≤( R 5+ R 6)/( R 5− R 6)≤−0.96; and

0.05≤ d 5/ TTL≤ 0.19;

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.

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

2.50≤ f 4/ f≤ 26.48;

−201.36≤( R 7+ R 8)/( R 7− R 8)≤−15.55; 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; and

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

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

−67.69≤ f 5/ f≤− 2.89; and

0.02≤ d 9/ TTL≤ 0.06;

where

f5 denotes a focal length of the fifth lens.

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

1.69≤ f 6/ f≤ 12.93;

1.49≤( R 11+ R 12)/( R 11− R 12)≤9.80; and

0.03≤ 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; and

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

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

−5.36≤ f 7/ f≤− 1.50;

1.81≤( R 13+ R 14)/( R 13− R 14)≤7.10; and

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; and

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

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

−3.05≤ f 8/ f≤− 0.96;

−2.52≤( R 15+ R 16)/( R 15− R 16)≤−0.58; and

0.03≤ d 15/ TTL≤ 0.09;

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.