# US 12,111,447 B2 · Imaging lens

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- Number: US 12,111,447 B2
- Document ID: US12111447B2
- Status: Granted
- Kind: B2
- Application number: 17/310,911
- Filed: 2020-02-26
- Published: 2022-04-21
- Granted: 2024-10-08
- Earliest claimed: 2019-03-13
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Duk Keun Kwon
- Web page: https://patentgrep.com/patent/US12111447B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B 13/04: Reversed telephoto objectives
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens is provided. An imaging lens according to an aspect of the present invention comprises a first lens having negative (−) refractive power, a second lens having positive (+) refractive power, a third lens having positive (+) refractive power, a fourth lens having negative (−) refractive power, a fifth lens having positive (+) refractive power, and a sixth lens having negative (−) refractive power, which are arranged in the order from an object side to an image-side, wherein each of the lenses satisfies the equation tan θd×D>−0.2 (where θd is the maximum half-angle of field of view of an optical system, and D is the degree of distortion at the maximum image height).

## Claims

### Claim 1

An imaging lens comprising:
a first lens having negative (−) refractive power;
a second lens having positive (+) refractive power;
a third lens having positive (+) refractive power;
a fourth lens having negative (−) refractive power;
a fifth lens having positive (+) refractive power; and
a sixth lens,
wherein the first to sixth lenses are disposed in order from an object-side to an image-side,
wherein the imaging lens satisfies an equation:
tan θd×D>−0.2,
wherein θd is a maximum half-angle of field of view of an optical system, and D is a degree of distortion at a maximum image height,
wherein a radius of curvature of an object-side surface of the first lens is negative at an optical axis,
wherein a radius of curvature of an object-side surface of the fourth lens is negative at the optical axis, and
wherein a radius of curvature of an object-side surface of the fifth lens is negative at the optical axis.

### Claim 2 (depends on 1)

The imaging lens of claim 1, satisfying an equation:
0.7<TTL/(2×Y)<1.2,
wherein TTL is a distance from an object-side surface of the first lens to an imaging plane, and Y is a maximum image height.

### Claim 3 (depends on 1)

The imaging lens of claim 1, satisfying an equation:
1<TTL/f<3,
wherein TTL is a distance from the object-side surface of the first lens to an imaging plane, and f is a focal length of the imaging lens.

### Claim 4 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an image-side surface of the second lens is positive at the optical axis.

### Claim 5 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an object-side surface of the third lens is positive at the optical axis.

### Claim 6 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an image-side surface of the third lens is negative at the optical axis.

### Claim 7 (depends on 1)

The imaging lens of claim 1, wherein, at the optical axis, a distance between the first lens and the second lens is greater than a distance between the fourth lens and the fifth lens.

### Claim 8 (depends on 1)

The imaging lens of claim 1, comprising an aperture disposed between the second lens and the third lens.

### Claim 9 (depends on 1)

The imaging lens of claim 1, wherein the sixth lens has a negative (−) refractive power.

### Claim 10

An imaging lens comprising:
a first lens having negative (−) refractive power;
a second lens having positive (+) refractive power;
a third lens having positive (+) refractive power;
a fourth lens having negative (−) refractive power;
a fifth lens having positive (+) refractive power; and
a sixth lens having negative (−) refractive power,
wherein the first to sixth lenses are disposed in order from an object-side to an image-side,
wherein the first lens is disposed closest to the object-side, and the sixth lens is disposed closest to the image-side,
wherein an image-side surface of the first lens is formed to be concave at an optical axis,
wherein a radius of curvature of an object-side surface of the first lens is negative at the optical axis,
wherein a radius of curvature of an object-side surface of the fourth lens is negative at the optical axis, and
wherein a radius of curvature of an object-side surface of the fifth lens is negative at the optical axis.

### Claim 11 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an image-side surface of the first lens is positive at the optical axis.

### Claim 12 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an object-side surface of the second lens is positive at the optical axis.

### Claim 13 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an image-side surface of the fourth lens is positive at the optical axis.

### Claim 14 (depends on 1)

The imaging lens of claim 1, wherein a radius of curvature of an image-side surface of the fifth lens is negative at the optical axis.

### Claim 15 (depends on 1)

The imaging lens of claim 1, wherein, at the optical axis, a distance between the third lens and the fourth lens is greater than a distance between the fifth lens and the sixth lens.

### Claim 16 (depends on 1)

A camera module comprising the imaging lens of claim 1.

### Claim 17

An imaging lens comprising:
a first lens having negative (−) refractive power;
a second lens having positive (+) refractive power;
a third lens having positive (+) refractive power;
a fourth lens having negative (−) refractive power;
a fifth lens having positive (+) refractive power; and
a sixth lens having negative (−) refractive power,
wherein the first to sixth lenses are disposed in order from an object-side to an image-side,
wherein, at an optical axis, a distance between the third lens and the fourth lens is greater than a distance between the fifth lens and the sixth lens,
wherein a radius of curvature of an object-side surface of the first lens is negative at the optical axis,
wherein a radius of curvature of an object-side surface of the fourth lens is negative at the optical axis, and
wherein a radius of curvature of an object-side surface of the fifth lens is negative at the optical axis.

### Claim 18 (depends on 17)

The imaging lens of claim 17, wherein a radius of curvature of an object-side surface of the second lens is positive at the optical axis, and
wherein a radius of curvature of an image-side surface of the second lens is positive at the optical axis.

### Claim 19 (depends on 17)

The imaging lens of claim 17, wherein a radius of curvature of an image-side surface of the fourth lens is positive at the optical axis.

### Claim 20 (depends on 17)

The imaging lens of claim 17, wherein a radius of curvature of an image-side surface of the fifth lens is negative at the optical axis.