# US 11,899,180 B2 · Imaging lens

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- Number: US 11,899,180 B2
- Document ID: US11899180B2
- Status: Granted
- Kind: B2
- Application number: 17/391,885
- Filed: 2021-08-02
- Published: 2022-06-09
- Granted: 2024-02-13
- Earliest claimed: 2019-10-10
- Assignees: Tokyo Visionary Optics Co., Ltd.
- Applicants: Tokyo Visionary Optics Co., Ltd.
- Inventors: Masaya Hashimoto
- Web page: https://patentgrep.com/patent/US11899180B2

## CPC

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

## Abstract

There is provided an imaging lens with excellent optical characteristics which satisfies demand of low profile and low F-number. An imaging lens comprising in order from an object side to an image side, a first lens with positive refractive power having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with negative refractive power having an object-side surface being convex in a paraxial region, a fourth lens having an object-side surface being convex in a paraxial region, a fifth lens with negative refractive power in a paraxial region, and a sixth lens with positive refractive power having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

## Claims

### Claim 1

An imaging lens comprising, in order from an object side to an image side, a first lens with positive refractive power having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with negative refractive power having an object-side surface being convex in a paraxial region, a fourth lens having an object-side surface being convex in a paraxial region, a fifth lens with negative refractive power in a paraxial region, and a sixth lens with positive refractive power having an image-side surface being convex in a paraxial region, wherein the following conditional expressions (1), (2) and (3) are satisfied:
11.00<vd2<27.00 (1)
−1.55<f3/f<−0.20 (2)
0.25<r3/f<5.00 (3)
where
vd2: an abbe number at d-ray of the second lens,
f3: a focal length of the third lens,
f: a focal length of the overall optical system of the imaging lens, and
r3: a paraxial curvature radius of an object-side surface of the second lens, and
wherein an image-side surface of said first lens is convex in a paraxial region.

### Claim 2 (depends on 1)

The imaging lens according to claim 1, wherein an object-side surface of said fifth lens is concave in a paraxial region.

### Claim 3 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (4) is satisfied:
9.00<(D6/f6)×100 (4)
where
D6: a thickness along the optical axis of the sixth lens, and
f6: a focal length of the sixth lens.

### Claim 4 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (5) is satisfied:
0.50<f6/f1<2.60 (5)
where
f6: a focal length of the sixth lens, and
f1: a focal length of the first lens.

### Claim 5 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (6) is satisfied:
1.00<r2/r12<7.50 (6)
where
r2: a paraxial curvature radius of an image-side surface of the first lens, and
r12: a paraxial curvature radius of an image-side surface of the sixth lens.

### Claim 6 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (7) is satisfied:
0.10<r8/f<0.55 (7)
where
r8: a paraxial curvature radius of an image-side surface of the fourth lens, and
f: a focal length of the overall optical system of the imaging lens.