Camera optical lens comprising six lenses of −+++−− or −++++− refractive powers

1. A camera optical lens comprising, from an object side to an image side in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens;

wherein the first lens has a negative refractive power with a convex object side surface and a concave image side surface, the second lens has a positive refractive power, the third lens has a positive refractive power; the camera optical lens further satisfies the following conditions:

−2.4≥ f 1/ f≥− 1.5;

1.7≥ n 1≥2.2;

1.7≥ n 5≥2.2;

0.59≥ f 12/ f≥ 2.01;

3.22≥( R 1+ R 2)/( R 1− R 2)≥11.15;

0.02≥ d 1/ TTL≥ 0.07;

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;

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;

n1: a refractive index of the first lens;

n5: a refractive index of the fifth lens.

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

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

−2.347≥ f 1/ f≥− 1.550;

1.796≥ n 1≥2.080;

1.714≥ n 5≥2.062

.

4. The camera optical lens as described in claim 1 , wherein the camera optical lens further satisfies the following conditions: 5 . 15 ≥(R 1 +R 2 )/(R 1 −R 2 )≥ 8 . 92 ; 0 . 04 ≥d 1 /TTL≥ 0 . 05 .

5. 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:

0.32≥ f 2/ f≥ 1.19;

−2.98≥( R 3+ R 4)/( R 3− R 4)≥−0.77;

0.06≥ d 3/ TTL≥ 0.19; where

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.

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

0.51≥ f 2/ f≥ 0.95;

−1.86≥( R 3+ R 4)/( R 3− R 4)≥−0.97;

0.09≥ d 3/ TTL≥ 0.15

.

7. 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:

3.59≥ f 3/ f≥ 305.28;

−77.38≥( R 5+ R 6)/( R 5− R 6)≥83.09;

0.02≥ d 5/ TTL≥ 0.08;

where

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.

8. The camera optical lens as described in claim 7 , wherein the camera optical lens further satisfies the following conditions:

5.74≥ f 3/ f≥ 244.22;

−48.36≥( R 5+ R 6)/( R 5− R 6)≥66.47;

0.04≥ d 5/ TTL≥ 0.06

.

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

0.90≥f4/f≥5.84;

1.10≥(R7+R8)/(R7−R8)≥6.16;

0.03≥d7/TTL≥0.13;

where

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.

10. The camera optical lens as described in claim 9 , wherein the camera optical lens further satisfies the following conditions:

1.44≥ f 4/ f 4.67;

1.76≥( R 7+ R 8)/( R 7− R 8)≥4.93;

0.05≥ d 7/ TTL≥ 0.11

.

11. 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:

31 16.47≥ f 5/ f≥ 41.45;

−43.23≥( R 9+ R 10)/( R 9− R 10)≥6.72;

0.03≥ d 9/ TTL≥ 0.10;

where

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.

12. The camera optical lens as described in claim 11 , wherein the camera optical lens further satisfies the following conditions:

31 10.29≥ f 5/ f≥ 33.16;

−27.02≥( R 9+ R 10)/( R 9− R 10)≥8.40;

0.04≥ d 9/ TTL≥ 0.08

.

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

31 11.48≥ f 6/ f≥− 1.18;

1.61≥( R 11+ R 12)/( R 11− R 12)≥8.81;

0.09≥ d 11/ TTL≥− 0.30;

where

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.

14. The camera optical lens as described in claim 13 , wherein the camera optical lens further satisfies the following conditions:

−7.17 ≥f 6 /f −1.48;

2.57≥( R 11 +R 12)/( R 11 −R 12)≥7.04;

0.15≥ d 11/ TTL≥ 0.24

.

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

0.94≥ f 12/ f≥ 1.61

16. The camera optical lens as described in claim 1 , wherein a total optical length TTL of the camera optical lens is less than or equal to 5.17 mm.

17. The camera optical lens as described in claim 16 , wherein the total optical length TTL of the camera optical lens is less than or equal to 4.94 mm.

18. The camera optical lens as described in claim 1 , wherein an aperture F number of the camera optical lens is less than or equal to 2.22.