# US 2019/0170982 A1 · Imaging lens

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- Number: US 2019/0170982 A1
- Document ID: US20190170982A1
- Status: Published application
- Kind: A1
- Application number: 16/272,735
- Filed: 2019-02-11
- Published: 2019-06-06
- Earliest claimed: 2015-08-31
- Assignees: Kantatsu Co., Ltd.
- Applicants: Kantatsu Co., Ltd.
- Inventors: Yukio SEKINE; Masaya HASHIMOTO
- Web page: https://patentgrep.com/patent/US20190170982A1

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- G02B 13/002: {having at least one aspherical surface}
- 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 imaging lens which meets the demands for low-profileness and a wide field of view and corrects various aberrations properly. The imaging lens includes, in order from an object side to an image side: an aperture stop; a first lens with positive refractive power having a convex surface on the object side; a second lens with negative refractive power as a meniscus lens having a concave surface on the image side; a third lens having a concave surface on the image side; a fourth lens; a fifth lens with positive refractive power having a convex surface on the image side; and a sixth lens with negative refractive power having a concave surface on each of the object side and the image side.

## Claims

### Claim at position 1

1-23. (canceled)

### Claim 24

An imaging lens which forms an image of an object on a solid-state image sensor, comprising exactly six lenses arranged, in the following order from an object side to an image side:
a first lens with positive refractive power as a meniscus lens having a convex surface on the object side;
a second lens with refractive power having a concave surface on the image side;
a third lens with positive refractive power as a meniscus lens having a concave surface on the image side;
a fourth lens with refractive power having a convex surface on the object side;
a fifth lens that is a double-sided aspheric lens having a convex surface on the image side; and
a sixth lens that is a double-sided aspheric lens with negative refractive power having a concave surface on the object side,
wherein conditional expressions (1) and (2) below are satisfied:
0.18<AG16/Σd<0.3 (1)
20<vd3−vd4<40 (2)
where
AG16: sum of air gaps on an optical axis from the first lens to the sixth lens
Σd: distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens
vd3: Abbe number of the third lens at d-ray
vd4: Abbe number of the fourth lens at d-ray.

### Claim 25 (depends on 24)

The imaging lens according to claim 24,
wherein an aperture stop is located on the object side of the first lens.

### Claim 26 (depends on 24)

The imaging lens according to claim 24, comprising:
a lens group with positive composite refractive power including the first lens, the second lens, and the third lens; and
a lens group with negative composite refractive power including the fourth lens, the fifth lens, and the sixth lens.

### Claim 27 (depends on 24)

The imaging lens according to claim 24,
wherein the object-side surface of the fifth lens has a pole point off an optical axis.

### Claim 28 (depends on 27)

The imaging lens according to claim 27,
wherein a conditional expression (3) below is satisfied:
0.2<Ph51/ih<0.9 (3)
where
Ph51: vertical height of the pole point on the object-side surface of the fifth lens from the optical axis
ih: maximum image height.

### Claim 29 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (4) below is satisfied:
(f5+|f6|)/f<1.3 (4)
where
f: focal length of an overall optical system of the imaging lens
f5: focal length of the fifth lens
f6: focal length of the sixth lens.

### Claim 30 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (5) below is satisfied:
0.5<f1/f<1.5 (5)
where
f: focal length of an overall optical system of the imaging lens
f1: focal length of the first lens.

### Claim 31 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (6) below is satisfied:
1.5<(r3+r4)/(r3−r4)<4.5 (6)
where
r3: curvature radius of the object-side surface of the second lens
r4: curvature radius of the image-side surface of the second lens.

### Claim 32 (depends on 24)

The imaging lens according to claim 24,
wherein the fourth lens has negative refractive power.

### Claim 33 (depends on 32)

The imaging lens according to claim 32,
wherein the second lens, and the fourth lens have negative refractive power and the second lens, the fourth lens and the sixth lens satisfy a conditional expression (7) below:
P4<P2<P6 (7)
where
P2: refractive power of the second lens
P4: refractive power of the fourth lens
P6: refractive power of the sixth lens.

### Claim 34 (depends on 33)

The imaging lens according to claim 33,
wherein the fifth lens has positive refractive power and the first lens, the third lens and the fifth lens satisfy a conditional expression (8) below:
P3<P1<P5 (8)
where
P1: refractive power of the first lens
P3: refractive power of the third lens
P5: refractive power of the fifth lens.

### Claim 35 (depends on 24)

The imaging lens according to claim 24,
wherein the image-side surface of the sixth lens has a pole point off an optical axis.

### Claim 36 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (9) below is satisfied:
20<vd1−vd2<40 (9)
where
vd1: Abbe number of the first lens at d-ray
vd2: Abbe number of the second lens at d-ray.

### Claim 37 (depends on 36)

The imaging lens according to claim 36,
wherein conditional expressions (10) and (11) below are satisfied:
50<vd5<70 (10)
50<vd6<70 (11)
where
vd5: Abbe number of the fifth lens at d-ray
vd6: Abbe number of the sixth lens at d-ray.

### Claim 38 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (12) below is satisfied:
0.75<D5/D6<1.50 (12)
where
D5: thickness of the fifth lens on an optical axis
D6: thickness of the sixth lens on the optical axis.

### Claim 39 (depends on 38)

The imaging lens according to claim 38,
wherein a conditional expression (13) below is satisfied:
0.35<(T5/f)×100<3.00 (13)
where
T5: distance on the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens
f: focal length of an overall optical system of the imaging lens.

### Claim 40 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (14) below is satisfied:
0.6<|r7|/f<17.0 (14)
where
f: focal length of an overall optical system of the imaging lens
r7: curvature radius of the object-side surface of the fourth lens.

### Claim 41 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (15) below is satisfied:
0.45<E5/D5<1.20 (15)
where
E5: edge thickness of the fifth lens in a maximum effective diameter
D5: thickness of the fifth lens on an optical axis.

### Claim 42 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (16) below is satisfied:
0.6<f12/f<2.0 (16)
where
f: focal length of an overall optical system of the imaging lens
f12: composite focal length of the first lens and the second lens.

### Claim 43 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (17) below is satisfied:
0.80<ih/f<1.0 (17)
where
f: focal length of an overall optical system of the imaging lens
ih: maximum image height.

### Claim 44 (depends on 24)

The imaging lens according to claim 24,
wherein a conditional expression (18) below is satisfied:
TTL/2ih<1.0 (18)
where
TTL: total track length
ih: maximum image height.