Camera optical lens

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 camera optical lens further satisfies the following conditions:

−3≤f1/f≤−1.2;

1.7≤n1≤2.2;

1.7≤n 4 ≤2.2;

0.5≤f5/f6≤0.8;

0.37≤f2/f≤1.21;

where

f: the focal length of the camera optical lens;

f1: the focal length of the first lens;

f2: the focal length of the second lens;

n1: the refractive index of the first lens;

n4: the refractive index of the fourth lens;

f5: the focal length of the fifth lens;

f6: the focal length of the sixth lens.

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

−2.925≤f1/f≤−1.401;

1.797≤n1≤2.080;

1.707≤n4≤1.986;

0.503≤f5/f6≤0.798.

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 plastic material, the third lens is made of plastic material, the fourth lens is made of glass 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 negative refractive power with a convex object side surface and a concave image side surface; the camera optical lens further satisfies the following conditions:

2.96a≤(R1+R2)/(R1−R2)≤13.18;

0.02≤d1/TTL≤0.07; where

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

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

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

TTL: the total optical length of the camera optical lens.

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

4.74a≤(R1+R2)/(R1−R2)≤10.54;

0.04≤d1/TTL≤0.05.

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

−2.98≤(R3+R4)/(R3-R4)≤−0.85;

0.06≤d3/TTL≤0.17; where

f: the focal length of the camera optical lens;

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

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

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

TTL: the total optical length of the camera optical lens.

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

0.59≤f2/f≤0.97;

−1.86≤(R3+R4)/(R3-R4)≤−1.06;

0.09≤d3/TTL≤0.14.

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

2.01≤f3/f≤207.29;

−18.57≤(R5+R6)/(R5-R6)≤−147.54;

0.02≤d5/TTL≤0.07; where

f: the focal length of the camera optical lens;

f3: the focal length of the third lens;

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

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

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

TTL: the total optical length of the camera optical lens.

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

3.22≤f3/f≤165.83;

−11.61≤(R5+R6)/(R5-R6)≤−118.03;

0.04≤d5/TTL≤0.06.

10. 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:

0.84≤f4/f≤2.72;

−1.45≤(R7+R8)/(R7-R8)≤−5.36;

0.04≤d7/TTL≤0.12; where

f: the focal length of the camera optical lens;

f4: the focal length of the fourth lens;

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

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

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

TTL: the total optical length of the camera optical lens.

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

1.34≤f4/f≤2.18;

−2.31≤(R7+R8)/(R7-R8)≤−4.29;

0.06≤d7/TTL≤0.10.

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

−6.48≤f5/f≤−1.85;

−16.49≤(R9+R10)/(R9-R10)≤−5.31;

0.02≤d9/TTL≤0.10; where

f: the focal length of the camera optical lens;

f5: the focal length of the fifth lens;

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

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

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

TTL: the total optical length of the camera optical lens.

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

−4.05≤f5/f≤−2.31;

−10.31≤(R9+R10)/(R9-R10)≤−6.64;

0.04≤d9/TTL≤0.08.

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

−12.61≤f6/f≤−2.32;

−2.48≤(R11+R12)/(R11-R12)≤−9.12;

0.09≤d11/TTL≤0.31; where

f: the focal length of the camera optical lens;

f6: the focal length of the sixth lens;

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

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

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

TTL: the total optical length of the camera optical lens.

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

−7.88≤f6/f≤−2.90;

3.97≤(R11+R12)/(R11-R12)≤−7.29;

0.14≤d11/TTL≤0.24.

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

0.62≤f12/f≤2.29; where

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

f: the focal length of the camera optical lens.

17. The camera optical lens as described in claim 16 further satisfying the following condition;

0.99≤f12/f≤1.83.

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

19. The camera optical lens as described in claim 18 , wherein the total optical length TTL of the camera optical lens is less than or equal to 4.94 mm.

20. 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 2.16.

21. The camera optical lens as described in claim 20 , wherein the aperture F number of the camera optical lens is less than or equal to 2.12.