# US 11,442,248 B2 · Imaging lens

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- Number: US 11,442,248 B2
- Document ID: US11442248B2
- Status: Granted
- Kind: B2
- Application number: 17/017,809
- Filed: 2020-09-11
- Published: 2020-12-31
- Granted: 2022-09-13
- Earliest claimed: 2017-12-12
- Assignees: Tokyo Visionary Optics Co., Ltd.
- Applicants: Tokyo Visionary Optics Co., Ltd.
- Inventors: Yoji Kubota; Kenichi Kubota; Hitoshi Hirano; Hisao Fukaya
- Web page: https://patentgrep.com/patent/US11442248B2

## CPC

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

## Abstract

An imaging lens includes a first lens having negative refractive power; an aperture stop; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The fourth lens is formed in a meniscus shape at a paraxial region thereof. The fifth lens is formed in a shape so that a surface thereof on the object side is convex at a paraxial region thereof. The sixth lens is formed in a meniscus shape at a paraxial region thereof. The first lens and the sixth lens have specific Abbe's numbers.

## Claims

### Claim 1

An imaging lens comprising:
a first lens having negative refractive power;
an aperture stop;
a second lens;
a third lens;
a fourth lens;
a fifth lens; and
a sixth lens, arranged in this order from an object side to an image plane side,
wherein said fourth lens is formed in a meniscus shape at a paraxial region thereof,
said fifth lens is formed in a shape so that a surface thereof on the object side is convex at a paraxial region thereof,
said sixth lens is formed in a meniscus shape at a paraxial region thereof, and
said first lens has an Abbe's number ν1, said sixth lens has an Abbe's number ν6, and said
second lens and said third lens have a composite focal length f23 so that the following conditional expressions are satisfied:
40<ν1<75,
10<ν6<40,
0.2<f23/f<1,
where f is a focal length of a whole lens system.

### Claim 2 (depends on 1)

The imaging lens according to claim 1, wherein said first lens is disposed away from the second lens by a distance D12 on an optical axis thereof so that the following conditional expression is satisfied:
0.05<D12/f<0.8,
where f is a focal length of a whole lens system.

### Claim 3 (depends on 1)

The imaging lens according to claim 1, wherein said second lens is disposed away from the third lens by a distance D23 on an optical axis thereof so that the following conditional expression is satisfied:
0.001<D23/f<0.3,
where f is a focal length of a whole lens system.

### Claim 4 (depends on 1)

The imaging lens according to claim 1, wherein said first lens is disposed away from the second lens by a distance D12 on an optical axis thereof, and said second lens is disposed away from the third lens by a distance D23 on an optical axis thereof so that the following conditional expression is satisfied:
2<D12/D23<30.

### Claim 5 (depends on 1)

The imaging lens according to claim 1, wherein said sixth lens has a focal length f6 so that the following conditional expression is satisfied:
−5<f6/f<−0.5,
where f is a focal length of a whole lens system.

### Claim 6 (depends on 1)

The imaging lens according to claim 1, wherein said fifth lens has a thickness T5 on an optical axis thereof and said sixth lens has a thickness T6 on an optical axis thereof so that the following conditional expression is satisfied:
0.5<T5/T6<3.5.

### Claim 7

An imaging lens comprising:
a first lens having negative refractive power;
an aperture stop;
a second lens;
a third lens;
a fourth lens;
a fifth lens; and
a sixth lens, arranged in this order from an object side to an image plane side,
wherein said second lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side are convex at a paraxial region thereof,
said third lens is formed in a shape so that a surface thereof on the object side is convex at a paraxial region thereof,
said fourth lens is formed in a meniscus shape at a paraxial region thereof,
said fifth lens is formed in a shape so that a surface thereof on the object side is convex at a paraxial region thereof, and
said first lens is disposed away from the second lens by a distance D12 on an optical axis thereof,
and said fifth lens has a thickness T5 on an optical axis thereof, said sixth lens has a thickness T6 on an optical axis thereof, and said second lens and said third lens have a composite focal length f23 so that the following conditional expressions are satisfied:
0.05<D12/f<0.8,
0.5<T5/T6<3.5,
0.2<f23/f<1,
where f is a focal length of a whole lens system.

### Claim 8 (depends on 7)

The imaging lens according to claim 7, wherein said second lens is disposed away from the third lens by a distance D23 on an optical axis thereof so that the following conditional expression is satisfied:
0.001<D23/f<0.3.

### Claim 9 (depends on 7)

The imaging lens according to claim 7, wherein said second lens is disposed away from the third lens by a distance D23 on an optical axis thereof so that the following conditional expression is satisfied:
2<D12/D23<30.

### Claim 10 (depends on 7)

The imaging lens according to claim 7, wherein said sixth lens has a focal length f6 so that the following conditional expression is satisfied:
−5<f6/f<−0.5.

### Claim 11 (depends on 7)

The imaging lens according to claim 7, wherein said sixth lens has an Abbe's number ν6 so that the following conditional expression is satisfied:
10<ν6<40.