# US 2019/0170969 A1 · Imaging lens assembly, image capturing unit and electronic device

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- Number: US 2019/0170969 A1
- Document ID: US20190170969A1
- Status: Published application
- Kind: A1
- Application number: 16/265,855
- Filed: 2019-02-01
- Published: 2019-06-06
- Earliest claimed: 2015-10-23
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co.,Ltd.
- Inventors: Lin-Yao LIAO; Hsin-Hsuan HUANG
- Web page: https://patentgrep.com/patent/US20190170969A1

## CPC

- G02B 9/60: having five components only
- G02B 9/62: having six components only
- G02B 13/0045: {having five or more lenses}
- G02B 13/006: {at least one element being a compound optical element, e.g. cemented elements}
- G02B 13/04: Reversed telephoto objectives
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has negative refractive power. The imaging lens assembly has a total of six lens elements.

## Claims

### Claim 1

An imaging lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; each of the six lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the first lens element has negative refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, the third lens element has positive refractive power, the object-side surface of the third lens element is convex in a paraxial region thereof, the fifth lens element has positive refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof, the sixth lens element has negative refractive power, and the image-side surface of the sixth lens element is concave in a paraxial region thereof;
wherein the imaging lens assembly further comprises an aperture stop disposed between the second lens element and the third lens element, an axial distance between the third lens element and the fourth lens element is larger than an axial distance between the fourth lens element and the fifth lens element, an Abbe number of the sixth lens element is V6, and the following condition is satisfied:
V6≤23.8.

### Claim 2 (depends on 1)

The imaging lens assembly of claim 1, wherein the second lens element has positive refractive power.

### Claim 3 (depends on 1)

The imaging lens assembly of claim 1, wherein the object-side surface of the first lens element is convex in a paraxial region thereof, and the image-side surface of the first lens element is concave in a paraxial region thereof.

### Claim 4 (depends on 1)

The imaging lens assembly of claim 1, wherein a sum of central thicknesses of all lens elements of the imaging lens assembly is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, and the following condition is satisfied:
0.60<ΣCT/Td<1.0.

### Claim 5 (depends on 1)

The imaging lens assembly of claim 1, wherein a focal length of the imaging lens assembly is f, an entrance pupil diameter of the imaging lens assembly is EPD, and the following condition is satisfied:
f/EPD<1.85.

### Claim 6 (depends on 1)

The imaging lens assembly of claim 1, wherein a focal length of the imaging lens assembly is f, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
0<f/R12<3.0.

### Claim 7 (depends on 1)

The imaging lens assembly of claim 1, wherein the Abbe number of the sixth lens element is V6, and the following condition is satisfied:
V6≤22.3.

### Claim 8 (depends on 1)

The imaging lens assembly of claim 1, wherein an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, an Abbe number of the fifth lens element is V5, and the following conditions are satisfied:
30<V1;
30<V3; and
30<V5.

### Claim 9 (depends on 1)

The imaging lens assembly of claim 1, wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging lens assembly is f, and the following condition is satisfied:
2.40≤TL/f<7.0.

### Claim 10 (depends on 1)

The imaging lens assembly of claim 1, wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:
0.74≤(CT5+CT6)/(CT1+CT2+CT3+CT4).

### Claim 11 (depends on 1)

The imaging lens assembly of claim 1, wherein a ratio of a focal length of the imaging lens assembly to a focal length of the first lens element is P1, a ratio of the focal length of the imaging lens assembly to a focal length of the second lens element is P2, a ratio of the focal length of the imaging lens assembly to a focal length of the fifth lens element is P5, a ratio of the focal length of the imaging lens assembly to a focal length of the sixth lens element is P6, and the following condition is satisfied:
(|P1|+|P2|)/(|P5|+|P6|)<0.60.

### Claim 12 (depends on 1)

The imaging lens assembly of claim 1, wherein a curvature radius of the object-side surface of the fourth lens element and a curvature radius of the image-side surface of the fourth lens element have the same sign.

### Claim 13 (depends on 1)

An image capturing unit, comprising:
the imaging lens assembly of claim 1; and
an image sensor disposed on the image side of the imaging lens assembly.

### Claim 14 (depends on 13)

An electronic device, comprising:
the image capturing unit of claim 13.

### Claim 15

An imaging lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; each of the six lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the first lens element has negative refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, the third lens element has positive refractive power, the object-side surface of the third lens element is convex in a paraxial region thereof, the fifth lens element has positive refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof, the sixth lens element has negative refractive power, and the image-side surface of the sixth lens element is concave in a paraxial region thereof;
wherein the imaging lens assembly further comprises an aperture stop disposed between the second lens element and the third lens element, an axial distance between the second lens element and the third lens element is larger than an axial distance between the fifth lens element and the sixth lens element, an Abbe number of the sixth lens element is V6, and the following condition is satisfied:
V6≤23.8.

### Claim 16 (depends on 15)

The imaging lens assembly of claim 15, wherein the second lens element has positive refractive power.

### Claim 17 (depends on 15)

The imaging lens assembly of claim 15, wherein each of the first lens element, the second lens element, the third lens element and the fourth lens element is a single and non-cemented lens element, the object-side surface of the first lens element is convex in a paraxial region thereof, and the image-side surface of the first lens element is concave in a paraxial region thereof.

### Claim 18 (depends on 15)

The imaging lens assembly of claim 15, wherein a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, an Abbe number of the fifth lens element is V5, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging lens assembly is f, and the following conditions are satisfied:
N1<N2;
30<V1;
30<V3;
30<V5; and
1.8<TL/f<7.0.

### Claim 19 (depends on 15)

The imaging lens assembly of claim 15, wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging lens assembly is f, and the following condition is satisfied:
2.40≤TL/f<7.0.

### Claim 20 (depends on 15)

The imaging lens assembly of claim 15, wherein a focal length of the imaging lens assembly is f, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
0<f/R12<3.0.

### Claim 21 (depends on 15)

The imaging lens assembly of claim 15, wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CTS, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:
0.65<(CT5+CT6)/(CT1+CT2+CT3+CT4).

### Claim 22 (depends on 15)

The imaging lens assembly of claim 15, wherein a ratio of a focal length of the imaging lens assembly to a focal length of the first lens element is P1, a ratio of the focal length of the imaging lens assembly to a focal length of the second lens element is P2, a ratio of the focal length of the imaging lens assembly to a focal length of the fifth lens element is P5, a ratio of the focal length of the imaging lens assembly to a focal length of the sixth lens element is P6, and the following condition is satisfied:
(|P1|±|P2|)/(|P5|+|P6|)<0.60.

### Claim 23 (depends on 15)

The imaging lens assembly of claim 15, wherein a ratio of a focal length of the imaging lens assembly to a focal length of the first lens element is P1, a ratio of the focal length of the imaging lens assembly to a focal length of the second lens element is P2, a ratio of the focal length of the imaging lens assembly to a focal length of the fifth lens element is P5, a ratio of the focal length of the imaging lens assembly to a focal length of the sixth lens element is P6, and the following condition is satisfied:
(|P1|+|P2|)/(|P5|+|P6|)≤0.32.

### Claim 24 (depends on 15)

The imaging lens assembly of claim 15, wherein a sum of central thicknesses of all lens elements of the imaging lens assembly is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the sixth lens element is Y62, and the following conditions are satisfied:
0.60<ΣCT/Td<1.0; and
0.80<Y11/Y62<1.55.

### Claim 25 (depends on 15)

The imaging lens assembly of claim 15, wherein a curvature radius of the object-side surface of the fourth lens element and a curvature radius of the image-side surface of the fourth lens element have the same sign.