Camera optical lens
The present disclosure relates to optical lens, and provides a camera optical lens including eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.80; and −20.00≤(R9+R10)/(R9−R10)≤−2.50. The camera optical lens can achieve good optical performance while meeting design requirements for a long focal length and ultra-thinness.
1. A camera optical lens comprising eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions:
0.95≤f/TTL;
−4.00≤f2/f≤−1.80;
1.30≤d12/d13≤5.50; and
−20.00≤(R9+R10)/(R9-R10)≤−2.50;
where
TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis;
f denotes a focal length of the camera optical lens;
f2 denotes a focal length of the second lens;
d12 denotes an on-axis distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens;
d13 denotes an on-axis thickness of the seventh lens;
R9 denotes a central curvature radius of an object-side surface of the fifth lens; and
R10 denotes a central curvature radius of an image-side surface of the fifth lens.
2. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
0.20≤f1/f≤0.81;
−1.70≤(R1+R2)/(R1-R2)≤−0.48; and
0.05≤d1/TTL≤0.25;
where
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; and
dl denotes an on-axis thickness of the first lens.
3. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
−2.11≤(R3+R4)/(R3-R4)≤0.97; and
0.02≤d3/TTL≤0.07;
where
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; and
d3 denotes an on-axis thickness of the second lens.
4. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
−2.53≤f3/f≤−0.46;
0.62≤(R5+R6)/(R5-R6)≤3.93; and
0.02≤d5/TTL≤0.05;
where
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; and
d5 denotes an on-axis thickness of the third lens.
5. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
−3.18≤f4/f≤6.19;
−31.27≤(R7+R8)/(R7-R8)≤6.93; and
0.02≤d7/TTL≤0.05;
where
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; and
d7 denotes an on-axis thickness of the fourth lens.
6. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
−3.07≤f5/f≤7293324.16; and
0.02≤d9/TTL≤0.05;
where
f5 denotes a focal length of the fifth lens; and
d9 denotes an on-axis thickness of the fifth lens.
7. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
0.62≤f6/f≤7.86;
−9.84≤(R11+R12)/(R11-R12)≤−0.48; and
0.02≤d11/TTL≤0.09;
where
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; and
d11 denotes an on-axis thickness of the sixth lens.
8. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
−2.56≤f7/f≤6.54;
−2.55≤(R13+R14)/(R13-R14)≤19.28; and
0.03≤d13/TTL≤0.18;
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.
9. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following conditions:
−27.31≤f8/f≤−0.73;
−33.65≤(R15+R16)/(R15-R16)≤11.25; and
0.03≤d15/TTL≤0.11;
where
f8 denotes a focal length of the eighth lens;
R15 denotes a central curvature radius of an object-side surface of the eighth lens;
R16 denotes a central curvature radius of an image-side surface of the eighth lens; and
d15 denotes an on-axis thickness of the eighth lens.
10. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following condition the following condition:
f/IH≥2.28
where
IH denotes an image height of the camera optical lens.