# US 10,120,165 B2 · Wide angle six-piece lens

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- Number: US 10,120,165 B2
- Document ID: US10120165B2
- Status: Granted
- Kind: B2
- Application number: 15/237,982
- Filed: 2016-08-16
- Published: 2017-11-23
- Granted: 2018-11-06
- Earliest claimed: 2016-05-17
- Assignees: Kinko Optical Co., Ltd.
- Applicants: Kinko Optical Co., Ltd.
- Inventors: See-Ying Chen
- Web page: https://patentgrep.com/patent/US10120165B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B 13/06: Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A wide angle six-piece lens includes a first lens having a negative refractive power and an image side as a concave surface, a second lens having a positive refractive power and an object side as a convex surface, an aperture, a third lens having a positive refractive power and an image side as a convex surface, a fourth lens having a positive refractive power and an object surface and an image surface as convex surfaces, a fifth lens having a negative refractive power and an object side as a concave surface, and a sixth lens having a positive refractive power and an object side as a convex surface. The overall effective focal length of the wide angle six-piece lens is f, the focal length of the third lens is f3, and an equation 0.29<f/f3<0.36 is satisfied. As such, a wide angle system is formed and aberration is eliminated.

## Claims

### Claim 1

A wide angle six-piece lens, from an object side to an image side, sequentially comprising:
a first lens (L1), having a negative refractive power, and including an object side having a radius of curvature greater than a radius of curvature of its image side;
a second lens (L2), having a positive refractive power, and including an object side having a radius of curvature smaller than a radius of curvature of its image side, wherein the radius of curvature of the object side of the second lens is in a positive value;
an aperture (S);
a third lens (L3), having a positive refractive power, and including a concave object side and a convex image side, wherein the radius of curvature of the object side of the third lens is in a negative value;
a fourth lens (L4), having a positive refractive power, and including an object side having a radius of curvature greater than a radius of curvature of its image side, wherein the radius of curvature of the object side of the fourth lens is in a positive value;
a fifth lens (L5), having a negative refractive power, and including an object side having a radius of curvature smaller than a radius of curvature of its image side, wherein the radius of curvature of the object side of the fifth lens is in a negative value; and
a sixth lens (L6), having a positive refractive power, and including an object side having a radius of curvature greater than a radius of curvature of its image side, wherein the radius of curvature of the object side of the sixth lens is in a positive value;
wherein a maximum distortion of an image generated by the wide angle six-piece lens along the image height is smaller than 8.5%;
wherein, an overall effective focal length of the wide angle six-piece lens is f, a focal length of the third lens (L3) is f3, and an equation below is further satisfied:
0.29<f/f3<0.36.

### Claim 2 (depends on 1)

The wide angle six-piece lens of claim 1, wherein the image side of the first lens is a concave surface; the object side of the second lens is a convex surface; the image side of the third lens is a convex surface; both the object side and the image side of the fourth lens are convex surfaces; the object side of the fifth lens is a concave surface; the object side of the six lens is a convex surface.

### Claim 3 (depends on 1)

The wide angle six-piece lens of claim 1, wherein an image side of the fourth lens (L4) is a convex surface.

### Claim 4 (depends on 1)

The wide angle six-piece lens of claim 1, wherein a system length of the wide angle six-piece lens is TTL, the overall effective focal length of the wide angle six-piece lens is f, and an equation below is further satisfied:
6.11≤TTL/f≤6.64.

### Claim 5 (depends on 1)

The wide angle six-piece lens of claim 1, wherein an object side of the first lens (L1) is a convex surface.

### Claim 6 (depends on 1)

The wide angle six-piece lens of claim 1, wherein an image side of the second lens (L2) is a concave surface.

### Claim 7 (depends on 1)

The wide angle six-piece lens of claim 1, wherein an image side of the fifth lens (L5) is a concave surface.

### Claim 8 (depends on 1)

The wide angle six-piece lens of claim 1, wherein an image side of the sixth lens (L6) is a convex surface.

### Claim 9 (depends on 1)

The wide angle six-piece lens of claim 1, wherein the overall effective focal length of the wide angle six-piece lens is f, a focal length of the fifth lens (L5) is f5, and an equation below is further satisfied:
0.68<|f/f5|<0.9.

### Claim 10 (depends on 1)

The wide angle six-piece lens of claim 1, wherein a radius of curvature of the image side of the first lens (L1) is R2, a radius of curvature of the object side of the second lens (L2) is R3, and the first lens (L1) and the second lens (L2) further satisfy an equation below:
1.5<R3/R2<4.

### Claim 11 (depends on 1)

The wide angle six-piece lens of claim 1, wherein a distance from an object side of the first lens (L1) to an imaging surface (20) is D, a focal length of the first lens (L1) is f1, and an equation below is further satisfied:
4.2<|D/f1|<5.4.

### Claim 12 (depends on 1)

The wide angle six-piece lens of claim 1, wherein a abbe number of the fourth lens (L4) is V4, a abbe number of the fifth lens (L5) is V5, a abbe number of the sixth lens (L6) is V6, and an equation below is further satisfied:
(
V
⁢
⁢
4
+
V
⁢
⁢
6
)
2
-
V
⁢
⁢
5
>
25.

### Claim 13 (depends on 1)

The wide angle six-piece lens of claim 1, wherein an object side and the image side of the first lens (L1) are aspheric.