Camera optical lens comprising sixth lenses of -+++-+ 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 second lens has a positive refractive power, the third lens has a positive refractive power; the camera optical lens further satisfies the following conditions:

−3≤f1/f≤−2;

1.7≤n4≤2.2;

1.7≤n5≤2.2;

0.055≤d7/TTL≤0.078;

0.44≤f2/f≤1.39; where

f: a focal length of the camera optical lens;

f1: a focal length of the first lens;

f2: a focal length of the second lens;

n4: a refractive index of the fourth lens;

n5: a refractive index of the fifth lens;

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

TTL: a total distance from the object side surface of the first lens to the image plane along the optic axis.

2. The camera optical lens as described in claim 1 , wherein the first lens is made of plastic 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 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:

−2.987≤f1/f≤−2.053;

1.701≤n4≤2.042;

1.709≤n5≤2.047;

0.063≤d7/TTL≤0.078; where

f: the focal length of the camera optical lens;

f1: the focal length of the first lens;

n4: the refractive index of the fourth lens;

n5: the refractive index of the fifth lens;

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

TTL: the total distance from the object side surface of the first lens to the image plane along the optic axis.

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

2.66≤(R1+R2)/(R1−R2)≤12.37;

0.02≤d1/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;

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

TTL: a total distance from the object side surface of the first lens to the image plane along the optic axis.

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

4.25≤(R1+R2)/(R1−R2)≤9.89;

0.04≤d1/TTL≤0.05; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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:

−2.82≤(R3+R4)/(R3−R4)≤−0.84;

0.05≤d3/TTL≤0.18; where

f: the focal length of the camera optical 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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

0.70≤f2/f≤1.11;

−1.76≤(R3+R4)/(R3−R4)≤−1.05;

0.09≤d3/TTL≤0.14; where

f: the focal length of the camera optical lens;

f2: the focal length of the second 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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:

1.49≤f3/f≤4.89;

−10.89≤(R5+R6)/(R5−R6)≤−2.75;

0.03≤d5/TTL≤0.08; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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

2.39≤f3/f≤3.91;

−6.80≤(R5+R6)/(R5−R6)≤−3.44;

0.04≤d5/TTL≤0.06; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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:

0.87≤f4/f≤2.93;

1.73≤(R7+R8)/(R7−R8)≤6.17; 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.

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

1.39≤f4/f≤2.34;

2.77≤(R7+R8)/(R7−R8)≤4.93; 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.

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:

−2.83≤f5/f≤−0.75;

−12.59≤(R9+R10)/(R9−R10)≤−3.41;

0.02≤d9/TTL≤0.07; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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

−1.77≤f5/f≤−0.94;

−7.87≤(R9+R10)/(R9−R10)≤−4.27;

0.04≤d9/TTL≤0.06; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

14. The camera optical lens as described in claim 1 , wherein the sixth 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:

1.71≤f6/f≤14.43;

7.30≤(R11+R12)/(R11−R12)≤324.38;

0.10≤d11/TTL≤0.31; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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

2.74≤f6/f≤11.55;

11.69≤(R11+R12)/(R11−R12)≤259.51;

0.15≤d11/TTL≤0.25; 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 distance from the object side surface of the first lens to the image plane along the optic axis.

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

0.72≤f12/f≤2.42; where

f: the focal length of the camera optical lens;

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

17. The camera optical lens as described in claim 16 , wherein the camera optical lens further satisfies the following conditions:

1.14≤f12/f≤1.94; where

f: the focal length of the camera optical lens;

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

18. The camera optical lens as described in claim 1 , wherein a total distance from the object side surface of the first lens to the image plane along the optic axis 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 distance from the object side surface of the first lens to the image plane along the optic axis 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 a aperture F number of the camera optical lens is less than or equal to 2.27.