# US 2019/0170980 A1 · Imaging lens

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0170980 A1
- Document ID: US20190170980A1
- Status: Published application
- Kind: A1
- Application number: 16/259,702
- Filed: 2019-01-28
- Published: 2019-06-06
- Earliest claimed: 2014-10-29
- Assignees: Kantatsu Co., Ltd.
- Applicants: Kantatsu Co., Ltd.
- Inventors: Masaya Hashimoto
- Web page: https://patentgrep.com/patent/US20190170980A1

## 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

A compact low-profile low-cost imaging lens with a small F-value which offers a wide field of view and corrects aberrations properly. Its elements are spaced from each other and arranged from an object side to an image side as follows: a first positive lens having a convex object-side surface; a second negative lens; a third positive or negative lens; a fourth positive or negative lens; a fifth positive or negative lens; a sixth positive or negative lens; and a seventh lens as a double-sided aspheric lens having a concave image-side surface. The third to sixth lenses each have at least one aspheric surface. The aspheric image-side surface of the seventh lens has a pole-change point off an optical axis. The imaging lens satisfies a conditional expression −1.0<f1/f2<−0.15, where f1 denotes focal length of the first lens, and f2 denotes focal length of the second lens.

## Claims

### Claim at position 1

1-20. (canceled)

### Claim 21

An imaging lens configured to form an image of an object on a solid-state image sensor, in which the lenses are arranged in order from an object side to an image side of the imaging lens and are spaced from each other, the imaging lens comprising:
a first lens with a positive refractive power;
a second lens with a negative refractive power having a convex surface facing the image side near an optical axis and a concave surface facing the image side near the optical axis;
a third lens with a positive or a negative refractive power;
a fourth lens with a positive or a negative refractive power;
a fifth lens with a positive refractive power having a convex surface facing the image side near the optical axis;
a sixth lens with a positive or a negative refractive power,
a seventh lens with a negative refractive power, the seventh lens being a double-sided aspheric lens having a concave surface facing the object side near the optical axis and a concave surface facing the image side near the optical axis, wherein
the third lens, the fourth lens, the fifth lens, and the sixth lens each have at least one aspheric surface,
the seventh lens has a pole-change point spaced from an optical axis of the imaging lens on its aspheric image-side surface, and
an expression (21) is satisfied:
f/EPD<2.40, where (21)
f: an overall focal length of the imaging lens, and
EPD: entrance pupil diameter.

### Claim 22 (depends on 1)

The imaging lens according to claim 1, wherein an expression (1) is satisfied:
−1.0<f1/f2<−0.15, where (1)
f1: a focal length of the first lens, and
f2: a focal length of the second lens.

### Claim 23 (depends on 1)

The imaging lens according to claim 1, wherein an expression (6) is satisfied:
20<νd1−νd2<40, where (6)
νd1: abbe number of the first lens at d-ray, and
νd2: abbe number of the second lens at d-ray.

### Claim 24 (depends on 1)

The imaging lens according to claim 1, wherein an expression (7) is satisfied:
40<νd3<75, where (7)
νd3: abbe number of the third lens at d-ray.

### Claim 25 (depends on 1)

The imaging lens according to claim 1, wherein an expression (8) is satisfied:
40<νd7<75, where (8)
νd7: abbe number of the seventh lens at d-ray.

### Claim 26 (depends on 1)

The imaging lens according to claim 1, wherein an expression (9) is satisfied:
40<νd4<75, where (9)
νd4: abbe number of the fourth lens at d-ray.

### Claim 27 (depends on 1)

The imaging lens according to claim 1, wherein an expression (10) is satisfied:
20<|νd5−νd6|<40, where (10)
νd5: abbe number of the fifth lens at d-ray, and
νd6: abbe number of the sixth lens at d-ray.

### Claim 28 (depends on 1)

The imaging lens according to claim 1, wherein an expression (13) is satisfied:
1.0<TTL/f<1.35, where (13)
f: an overall focal length of the imaging lens, and
TTL: a distance along the optical axis from an image plane of the imaging lens to an object-side surface of an optical element located nearest an imaged object.

### Claim 29 (depends on 1)

The imaging lens according to claim 1, wherein an expression (19) is satisfied:
0.8<(r9+r10)/(r9−r10)<2.5, where (19)
r9: curvature radius of the object-side surface of the fifth lens, and
r10: curvature radius of the image-side surface of the fifth lens.

### Claim 30 (depends on 1)

The imaging lens according to claim 1, wherein an expression (14) is satisfied:
TTL/2ih<1.0, where (14)
TTL: a distance along the optical axis from an image plane of the imaging lens to an object-side surface of an optical element located nearest an imaged object, and
ih: a maximum image height.

### Claim 31 (depends on 1)

The imaging lens according to claim 1, wherein an expression (2) is satisfied:
0.5<f5/f<1.5, where (2)
f: an overall focal length of the imaging lens, and
f5: a focal length of the fifth lens.