Camera optical lens

1. A camera optical lens, comprising, from an object side to an image side:

a first lens having a negative refractive power;

a second lens having a positive refractive power;

a third lens;

a fourth lens having a negative refractive power;

a fifth lens having a positive refractive power;

a sixth lens having a positive refractive power; and

a seventh lens having a negative refractive power,

wherein at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, or the seventh lens comprises a free-form surface, and

wherein the camera optical lends satisfies: 1.50≤d2/d3≤4.00, where d2 denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens, and d3 denotes an on-axis thickness of the second lens.

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

−3.68≤ f 1/ f≤− 1.08;

−0.50≤( R 1+ R 2)/( R 1− R 2)≤1.66; and

0.03≤ d 1/ TTL≤ 0.19

where f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, R1 denotes a central curvature radius of an 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, and TTL denotes a total optical length from the object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

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

0.5≤ f 2/ f≤ 5.80;

−8.28≤( R 3+ R 4)/( R 3− R 4)≤0.19; and

0.02≤ d 3/ TTL≤ 0.16,

where f denotes a focal length of the camera optical lens, f2 denotes a focal length of the second lens, 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, d3 denotes an on-axis thickness of the second lens, and TTL denotes a total optical length from an object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

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

−18.3≤ f 3/ f≤ 4.43;

−3.09≤( R 5+ R 6)/( R 5− R 6)≤1.98; and

0.02≤ d 5/ TTL≤ 0.21,

where f denotes a focal length of the camera optical lens, 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, d5 denotes an on-axis thickness of the third lens, and TTL denotes a total optical length from an object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

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

−5.87≤ f 4/ f≤− 1.39;

−0.23≤( R 7+ R 8)/( R 7− R 8)≤2.09; and

0.02≤ d 7/ TTL≤ 0.06;

where f denotes a focal length of the camera optical lens, 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, d7 denotes an on-axis thickness of the fourth lens, and TTL denotes a total optical length from an object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

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

1.18≤ f 5/ f≤ 9.88;

−1.67≤( R 9+ R 10)/( R 9− R 10)≤0.54; and

0.04≤ d 9/ TTL≤ 0.15,

where f denotes a focal length of the camera optical lens, f5 denotes a focal length of the fifth lens, R9 denotes a central curvature radius of an object-side surface of the fifth lens, 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 TTL denotes a total optical length from an object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

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

0.55≤ f 6/ f≤ 3.56;

0.67≤( R 11+ R 12)/( R 11− R 12)≤3.57; and

0.04≤ d 11/ TTL≤ 0.17,

where f denotes a focal length of the camera optical lens, 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, d11 denotes an on-axis thickness of the sixth lens, and TTL denotes a total optical length from an object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

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

−12.55≤ f 7/ f≤− 0.84;

1.40≤( R 13+ R 14)/( R 13− R 14)≤9.96; and

0.03≤ d 13/ TTL≤ 0.10,

where f denotes a focal length of the camera optical lens, 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, d13 denotes an on-axis thickness of the seventh lens, and TTL denotes a total optical length from an object-side surface of the first lens to an image plane of the camera optical lens along an optic axis.

9. The camera optical lens as described in claim 1 , wherein the camera optical lens satisfies: FNO≤1.96, where FNO denotes an F number of the camera optical lens.