# US 12,216,335 B2 · Imaging lens

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- Number: US 12,216,335 B2
- Document ID: US12216335B2
- Status: Granted
- Kind: B2
- Application number: 17/391,713
- Filed: 2021-08-02
- Published: 2021-11-18
- Granted: 2025-02-04
- Earliest claimed: 2019-03-07
- Assignees: Tokyo Visionary Optics Co., Ltd.
- Applicants: TOKYO VISIONARY OPTICS Co., Ltd.
- Inventors: Koji Nitta
- Web page: https://patentgrep.com/patent/US12216335B2

## CPC

- G02B 9/64: having more than six components
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B 3/02: with non-spherical faces (G02B3/10 takes precedence)
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- G02B 13/0045: {having five or more lenses}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

There is provided an imaging lens with excellent optical characteristics which satisfies demand of wide field of view, low profile and low F-number. An imaging lens comprises, in order from an object side to an image side, a first lens with positive or negative refractive power in a paraxial region, a second lens with positive or negative refractive power in a paraxial region, a third lens with positive refractive power in a paraxial region, a fourth lens with negative refractive power in a paraxial region, a fifth lens with positive refractive power in a paraxial region, a sixth lens with positive refractive power in a paraxial region, and a seventh lens with negative refractive power.

## Claims

### Claim 1

An imaging lens comprising in order from an object side to an image side,
a first lens with positive or negative refractive power in a paraxial region,
a second lens with positive or negative refractive power in a paraxial region,
a third lens with positive refractive power in a paraxial region,
a fourth lens with negative refractive power in a paraxial region,
a fifth lens with positive refractive power in a paraxial region,
a sixth lens with positive refractive power in a paraxial region, and
a seventh lens with negative refractive power,
wherein an image-side surface of said first lens is convex in the paraxial region, an object-side surface of said second lens is convex in the paraxial region, and an image-side surface of said sixth lens is concave in the paraxial region, and
wherein the following conditional expressions (4) and (5) are satisfied:
0.10<vd6/vd7<0.60 (4)
0.20<(D1/|f1|)×100<7.50 (5)
where
vd6: an abbe number at d-ray of the sixth lens,
vd7: an abbe number at d-ray of the seventh lens,
D1: a thickness of the first lens along the optical axis, and
f1: a focal length of the first lens.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

The imaging lens according to claim 1, wherein an image-side surface of said fourth lens is convex in the paraxial region.

### Claim 5 (depends on 1)

The imaging lens according to claim 1, wherein an object-side surface of said sixth lens is convex in the paraxial region.

### Claim 6 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (1) is satisfied:
0.10<(T1/TTL)×100<0.45 (1)
where
T1: a distance along the optical axis from an image-side surface of the first lens to an object-side surface of the second lens, and
TTL: a total track length.

### Claim 7 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (2) is satisfied:
10.00<T2/T4 (2)
where
T2: a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and
T4: a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.