Camera optical lens

1. A camera optical lens comprising of 6 lenses, from an object side to an image side in sequence: a first lens having a negative refractive power, a second lens having a positive 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, and a sixth lens having a positive refractive power; wherein an aperture F number of the camera optical lens is less than or equal to 2.06, the camera optical lens further satisfies the following conditions:

−5≤ f 1/ f≤− 3.1;

1.7≤ n 1≤2.2;

1.7≤ n 2≤2.2;

0.6≤ f 12/ f≤ 1.91;

where

f: a focal length of the camera optical lens;

f1: a focal length of the first lens;

f12: a combined focal length of the first lens and the second lens;

n1: a refractive index of the first lens;

n2: a refractive index of the second lens.

2. The camera optical lens as described in claim 1 further satisfying the following conditions:

−4.53≤ f 1/ f≤− 3.13;

1.797≤ n 1≤2.08;

1.71≤ n 2≤1.99.

3. The camera optical lens as described in claim 1 , wherein the first lens is made of glass material, the second lens is made of glass material, the third lens is made of plastic material, the fourth lens is made of plastic material, the fifth lens is made of plastic material, the sixth lens is made of plastic material.

4. The camera optical lens as described in claim 1 , wherein first lens has a convex object side surface and a concave image side surface; the camera optical lens further satisfies the following conditions:

4.42≤( R 1+ R 2)/( R 1− R 2)≤15.99;

0.02≤ d 1/ TTL≤ 0.07; where

R1: a curvature radius of object side surface of the first lens;

R2: a curvature radius of image side surface of the first lens;

d1: a thickness on-axis of the first lens;

TTL: a total optical length of the camera optical lens from the object side surface of the first lens to the image plane.

5. The camera optical lens as described in claim 4 further satisfying the following conditions:

7.07≤( R 1+ R 2)/( R 1− R 2)≤12.79;

0.04≤ d 1/ TTL≤ 0.06.

6. The camera optical lens as described in claim 1 , wherein the second lens has a convex object side surface and a concave image side surface; the camera optical lens further satisfies the following conditions:

0.42≤ f 2/ f≤ 1.31;

−4.04≤( R 3+ R 4)/( R 3− R 4)≤−1.25;

0.05≤ d 3/ TTL≤ 0.15; where

f: the focal length of the camera optical lens;

f2: a focal length of the second lens;

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

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

d3: a thickness on-axis of the second lens;

TTL: a total optical length of the camera optical lens from the object side surface of the first lens to the image plane.

7. The camera optical lens as described in claim 6 further satisfying the following conditions:

0.68≤ f 2/ f≤ 1.05;

−2.53≤( R 3+ R 4)/( R 3− R 4)≤−1.56;

0.08≤ d 3/ TTL≤ 0.12.

8. The camera optical lens as described in claim 1 , wherein the third lens has a convex object side surface and a concave image side surface; the camera optical lens further satisfies the following conditions:

36.76≤ f 3 /f ≤322.96;

61.14≤( R 5+ R 6)/( R 5− R 6)≤634.72;

0.02 ≤d 5 /TTL ≤0.07; where

f: the focal length of the camera optical lens;

f3: a focal length of the third lens;

R5: a curvature radius of the object side surface of the third lens;

R6: a curvature radius of the image side surface of the third lens;

d5: a thickness on-axis of the third lens;

TTL: a total optical length of the camera optical lens from the object side surface of the first lens to the image plane.

9. The camera optical lens as described in claim 8 further satisfying the following conditions:

58.82 ≤f 3 /f ≤258.37;

97.83≤( R 5+ R 6)/( R 5− R 6)≤507.77;

0.04 ≤d 5 /TTL ≤0.06.

10. The camera optical lens as described in claim 1 , wherein the fourth lens has a concave object side surface and a convex image side surface; the camera optical lens further satisfies the following conditions:

0.82 ≤f 4 /f ≤2.78;

0.92≤( R 7 +R 8)/( R 7 −R 8)≤3.13;

0.05 ≤d 7 /TTL ≤0.17; where

f: the focal length of the camera optical lens;

f4: a focal length of the fourth lens;

R7: a curvature radius of the object side surface of the fourth lens;

R8: a curvature radius of the image side surface of the fourth lens;

d7: a thickness on-axis of the fourth lens;

TTL: a total optical length of the camera optical lens from the object side surface of the first lens to the image plane.

11. The camera optical lens as described in claim 10 further satisfying the following conditions:

1.32≤ f 4 /f ≤2.23;

1.47≤( R 7 +R 8)/( R 7 −R 8)≤2.5;

0.08 ≤d 7 /TTL ≤0.14.

12. The camera optical lens as described in claim 1 , wherein the fifth lens has a concave object side surface and a convex image side surface; the camera optical lens further satisfies the following conditions:

−3.89≤ f 5 /f ≤−0.89;

−11.06≤( R 9 +R 10)/( R 9 −R 10)≤−2.72;

0.04 ≤d 9 /TTL ≤0.13; where

f: the focal length of the camera optical lens;

f5: a focal length of the fifth lens;

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

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

d9: a thickness on-axis of the fifth lens;

TTL: a total optical length of the camera optical lens from the object side surface of the first lens to the image plane.

13. The camera optical lens as described in claim 12 further satisfying the following conditions:

−2.43 ≤f 5 /f ≤−1.11;

−6.91≤( R 9 +R 10)/( R 9 −R 10)≤−3.4;

0.06 ≤d 9 /TTL ≤0.1.

14. The camera optical lens as described in claim 1 , wherein the sixth lens has a convex object side surface and a concave image side surface; the camera optical lens further satisfies the following conditions:

1.52 ≤f 6 /f ≤8.65;

−109.88≤( R 11 +R 12)/( R 11 −R 12)≤51.87;

0.1 ≤d 11 /TTL ≤0.34; where

f: the focal length of the camera optical lens;

f6: a focal length of the sixth lens;

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

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

d11: a thickness on-axis of the sixth lens;

TTL: a total optical length of the camera optical lens from the object side surface of the first lens to the image plane.

15. The camera optical lens as described in claim 14 further satisfying the following conditions:

2.43 ≤f 6 /f ≤6.92;

−68.67≤( R 11 +R 12)/( R 11 −R 12)≤41.49;

0.16 ≤d 11 /TTL ≤0.27.

16. The camera optical lens as described in claim 1 further satisfying the following condition:

0.96 ≤f 12 /f ≤1.53.

17. The camera optical lens as described in claim 1 , wherein a total optical length from the object side surface of the first lens to the image plane TTL of the camera optical lens is less than or equal to 5.17 mm.

18. The camera optical lens as described in claim 17 , wherein the total optical length TTL of the camera optical lens is less than or equal to 4.93 mm.

19. The camera optical lens as described in claim 1 , wherein the aperture F number of the camera optical lens is less than or equal to 2.02.