# US 12,007,535 B2 · Imaging lens comprising seven lenses of +−+−−+− or +++−−+− refractive powers

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- Number: US 12,007,535 B2
- Document ID: US12007535B2
- Status: Granted
- Kind: B2
- Application number: 17/391,852
- Filed: 2021-08-02
- Published: 2021-11-25
- Granted: 2024-06-11
- Earliest claimed: 2018-10-23
- Assignees: Tokyo Visionary Optics Co., Ltd.
- Applicants: Tokyo Visionary Optics Co., Ltd.
- Inventors: Hisao Fukaya
- Web page: https://patentgrep.com/patent/US12007535B2

## CPC

- G02B 13/0045: {having five or more lenses}
- 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: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a wide field of view, a low profile and a low F-number. An imaging lens comprises, in order from an object side to an image side, a first lens with positive refractive power in a paraxial region, a second lens, a third lens having an image-side surface being convex in the paraxial region, a fourth lens, a fifth lens with negative refractive power in the paraxial region, a sixth lens with positive refractive power in the paraxial region, and a seventh lens with negative refractive power having an image-side surface that is concave in the paraxial region and is formed as an aspheric surface having at least one pole point in a position off the optical axis.

## Claims

### Claim 1

An imaging lens comprising in order from an object side to an image side,
a first lens with positive refractive power in a paraxial region,
a second lens with positive refractive power in a paraxial region,
a third lens with positive refractive power in a paraxial region having an object-side surface being convex and an image-side surface being convex in the paraxial region,
a fourth lens,
a fifth lens with negative refractive power in the paraxial region,
a sixth lens with positive refractive power in the paraxial region, and
a seventh lens with negative refractive power in the paraxial region having an object-side surface being concave in the paraxial region and an image-side surface that is concave in the paraxial region and is formed as an aspheric surface having at least one pole point in a position off the optical axis,
wherein the first lens to the seventh lens are single lenses, respectively,
an object-side surface of the fifth lens is convex in the paraxial region and has at least one pole point in a position off the optical axis, and
an image-side surface of the fifth lens is concave in the paraxial region and is formed as an aspheric surface having at least one pole point in a position off the optical axis, an object-side surface of the sixth lens is convex and is formed as an aspheric surface having at least one pole point in a position off the optical axis, and an image-side surface of the sixth lens is convex in the paraxial region, and the following conditional expression (1) is satisfied:
1.8<νd3/νd4<4.0 (1)
where
νd3: an abbe number at d-ray of the third lens, and
νd4: an abbe number at d-ray of the fourth lens.

### Claim 2 (depends on 1)

The imaging lens according to claim 1, wherein the first lens is formed in a meniscus shape having an object-side surface being convex in the paraxial region.

### Claim 3 (depends on 1)

The imaging lens according to claim 1, wherein the fourth lens has negative refractive power in the paraxial region and has an object-side surface being concave in the paraxial region.

### Claim 4 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (2) is satisfied:
0.80<T2/T3<15.0 (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
T3: a distance along the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens.

### Claim 5 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (3) is satisfied:
0.70<Σd/f<1.30 (3)
where
Σd: a distance along the optical axis from an object-side surface of the first lens to an image-side surface of the seventh lens, and
f: a focal length of the overall optical system of the imaging lens.

### Claim 6 (depends on 1)

The imaging lens according to claim 1, wherein the following conditional expression (4) is satisfied:
6.0<(D6/TTL)×100<13.0 (4)
where
D6: a thickness of the sixth lens along the optical axis, and
TTL: a total track length.