Camera optical lens including eight lenses of +−+−−−+− refractive powers

Patent metadata

Field	Value
Publication number	US-11513322-B2
Application number	US-202016854933-A
Country	US
Kind code	B2
Filing date	Apr 22, 2020
Priority date	Dec 13, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

Provided is a camera optical lens, which includes, from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; a sixth lens having a negative refractive power; a seventh lens having a positive refractive power; and an eighth lens having a negative refractive power. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0.00; and 1.55≤n5≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n5 denotes a refractive index of the fifth lens. The present disclosure can achieve high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture.

First claim

What is claimed is:

1. A camera optical lens, comprising, from an object side to an image side:
a first lens;
a second lens;
a third lens;
a fourth lens;
a fifth lens;
a sixth lens;
a seventh lens; and
an eighth lens,
wherein the camera optical lens satisfies following conditions:
3.50≤f1/f≤6.50;
f2≤0.00,
−5.00≤f6/f≤−2.50; and
1.55≤n5≤1.70,
where
f denotes a focal length of the camera optical lens;
f1 denotes a focal length of the first lens;
f2 denotes a focal length of the second lens,
f6 denotes a focal length of the sixth lens; and
n5 denotes a refractive index of the fifth lens.

2. The camera optical lens as described in claim 1 , further satisfying a following condition:
5.00≤d5/d6≤20.00,
where
d5 denotes an on-axis thickness of the third lens; and
d6 denotes an on-axis distance from an image side surface of the third lens to an object side surface of the fourth lens.

3. The camera optical lens as described in claim 1 , further satisfying following conditions:
−34.94≤(R1+R2)/(R1−R2)≤−7.55; and
0.02≤d1/TTL≤0.10,
where
R1 denotes a curvature radius of an object side surface of the first lens;
R2 denotes a 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.

4. The camera optical lens as described in claim 1 , further satisfying following conditions:
−309.55≤f2/f≤−10.52;
10.01≤(R3+R4)/(R3−R4)≤129.30; and
0.01≤d3/TTL≤0.04,
where
R3 denotes a curvature radius of an object side surface of the second lens;
R4 denotes a 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.

5. The camera optical lens as described in claim 1 , further satisfying following conditions:
0.52≤f3/f≤1.60;
−0.44≤(R5+R6)/(R5−R6)≤−0.14; and
0.04≤d5/TTL≤0.15,
where
f3 denotes a focal length of the third lens;
R5 denotes a curvature radius of an object side surface of the third lens;
R6 denotes a 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.

6. The camera optical lens as described in claim 1 , further satisfying following conditions:
−8.08≤f4/f≤−2.35;
1.69≤(R7+R8)/(R7−R8)≤5.57; and
0.01≤d7/TTL≤0.05,
where
f4 denotes a focal length of the fourth lens;
R7 denotes a curvature radius of an object side surface of the fourth lens;
R8 denotes a 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.

7. The camera optical lens as described in claim 1 , further satisfying following conditions:
−36.55≤f5/f≤−8.20;
1.92≤(R9+R10)/(R9−R10)≤7.85; and
0.01≤d9/TTL≤0.05,
where
f5 denotes a focal length of the fifth lens;
R9 denotes a curvature radius of an object side surface of the fifth lens;
R10 denotes a 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.

8. The camera optical lens as described in claim 1 , further satisfying following conditions:
2.15≤(R11+R12)/(R11−R12)≤10.12; and
0.02≤d11/TTL≤0.10,
where
R11 denotes a curvature radius of an object side surface of the sixth lens;
R12 denotes a 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.

9. The camera optical lens as described in claim 1 , further satisfying following conditions:
0.48≤f7/f≤1.79;
−3.43≤(R13+R14)/(R13−R14)≤−1.04; and
0.05≤d13/TTL≤0.15,
where
f7 denotes a focal length of the seventh lens;
R13 denotes a curvature radius of an object side surface of the seventh lens;
R14 denotes a 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.

10. The camera optical lens as described in claim 1 , further satisfying following conditions:
−1.60≤f8/f≤−0.52;
0.04≤d15/TTL≤0.12; and
−1.04≤(R15+R16)/(R15−R16)≤−0.34,
where
f8 denotes a focal length of the eighth lens;
R15 denotes a curvature radius of an object side surface of the eighth lens;
R16 denotes a curvature radius of an image side surface of the eighth lens;
d15 denotes an on-axis thickness of the eighth 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.

Assignees

• Aac Optics Solutions Pte Ltd

Inventors

• Wang Jianming

Classifications

• G02B9/64

  having more than six components · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title

• G02B13/04

  Reversed telephoto objectives · CPC title

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title