# US 11,112,581 B2 · Optical imaging lens assembly, image capturing unit and electronic device

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- Number: US 11,112,581 B2
- Document ID: US11112581B2
- Status: Granted
- Kind: B2
- Application number: 16/847,066
- Filed: 2020-04-13
- Published: 2020-07-30
- Granted: 2021-09-07
- Earliest claimed: 2017-11-23
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Wei-Yu Chen
- Web page: https://patentgrep.com/patent/US11112581B2

## CPC

- G02B 9/64: having more than six components
- G02B 13/0045: {having five or more lenses}
- G02B 13/22: Telecentric objectives or lens systems
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical imaging lens assembly includes seven lens elements which are, 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, a sixth lens element and a seventh lens element. The seventh lens element has an image-side surface being concave in a paraxial region thereof. At least one of an object-side surface and the image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof. The object-side surface and the image-side surface of the seventh lens element are both aspheric.

## Claims

### Claim 1

An optical imaging lens assembly comprising seven lens elements, the seven 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, a sixth lens element and a seventh lens element;
wherein an axial distance between an object-side surface of the first lens element and an image-side surface of the seventh lens element is Td, a maximum effective radius of the image-side surface of the seventh lens element is Y72, a chief ray with an incident angle of 55 degrees relative to an optical axis is CR, an intersection point between CR and the image-side surface of the seventh lens element is P, a vertical distance from the optical axis to P is Yc_55, a maximum image height of the optical imaging lens assembly is ImgH, and the following conditions are satisfied:
Td/|Y72|<1.80; and
0.30<|Yc_55|/ImgH<0.95.

### Claim 2 (depends on 1)

The optical 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, the maximum image height of the optical imaging lens assembly is ImgH, a maximum field of view of the optical imaging lens assembly is FOV, an f-number of the optical imaging lens assembly is Fno, and the following conditions are satisfied:
TL/ImgH<2.0;
110 [deg.]<FOV<220 [deg.]; and
1.0<Fno<2.40.

### Claim 3 (depends on 1)

The optical imaging lens assembly of claim 1, wherein a maximum effective radius of the object-side surface of the first lens element is Y11, the maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:
|Y11/Y72|<1.20.

### Claim 4 (depends on 1)

The optical imaging lens assembly of claim 1, wherein a focal length of the optical imaging lens assembly is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following condition is satisfied:
|f/f1|+|f/f2|<0.70.

### Claim 5 (depends on 1)

The optical imaging lens assembly of claim 1, wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, a curvature radius of an object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of an image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius of an image-side surface of the sixth lens element is R12, a curvature radius of an object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, and the following conditions are satisfied:
|R14/R1|<1.0;
|R14/R2|<1.0;
|R14/R3|<1.0;
|R14/R4|<1.0;
|R14/R5|<1.0;
|R14/R6|<1.0;
|R14/R7|<1.0;
|R14/R8|<1.0;
|R14/R9|<1.0;
|R14/R10|<1.0;
|R14/R11|<1.0;
|R14/R12|<1.0; and
|R14/R13|<1.0.

### Claim 6 (depends on 1)

The optical imaging lens assembly of claim 1, wherein a vertical distance between a convex critical point closest to a maximum effective radius position on an image-side surface of the sixth lens element and the optical axis is Yc62, a vertical distance between a convex critical point closest to a maximum effective radius position on the image-side surface of the seventh lens element and the optical axis is Yc72, and the following condition is satisfied:
0.50<|Yc62/Yc72|<1.5.

### Claim 7 (depends on 1)

The optical imaging lens assembly of claim 1, wherein the sixth lens element is meniscus in a paraxial region thereof.

### Claim 8 (depends on 1)

The optical imaging lens assembly of claim 1, wherein a number of lens elements having an Abbe number smaller than 20 among the seven lens elements is V20, and the following condition is satisfied:
2≤V20.

### Claim 9 (depends on 1)

The optical imaging lens assembly of claim 1, wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, the maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:
1.0<Td/|Y72|<1.60.

### Claim 10 (depends on 1)

The optical imaging lens assembly of claim 1, wherein the seventh lens element has an object-side surface being convex in a paraxial region thereof.

### Claim 11 (depends on 1)

The optical imaging lens assembly of claim 1, wherein the fourth lens element has negative refractive power.

### Claim 12 (depends on 1)

The optical imaging lens assembly of claim 1, wherein at least one of an object-side surface and the image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof, and the object-side surface and the image-side surface of the seventh lens element are both aspheric.

### Claim 13 (depends on 1)

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

### Claim 14 (depends on 13)

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

### Claim 15

An optical imaging lens assembly comprising seven lens elements, the seven 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, a sixth lens element and a seventh lens element, wherein the first lens element has an object-side surface being concave in a paraxial region thereof, the third lens element has an image-side surface being convex in a paraxial region thereof, the sixth lens element has an image-side surface being concave in a paraxial region thereof, the image-side surface of the sixth lens element has at least one critical point in an off-axis region thereof, and an object-side surface and the image-side surface of the sixth lens element are both aspheric;
wherein an axial distance between the object-side surface of the first lens element and an image-side surface of the seventh lens element is Td, a maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:
Td/|Y72|<1.80.

### Claim 16 (depends on 15)

The optical imaging lens assembly of claim 15, wherein the object-side surface of the sixth lens element is convex in a paraxial region thereof and has at least one critical point in an off-axis region thereof.

### Claim 17 (depends on 15)

The optical imaging lens assembly of claim 15, wherein the image-side surface of the seventh lens element is concave in a paraxial region thereof and has at least one critical point in an off-axis region thereof, and an object-side surface and the image-side surface of the seventh lens element are both aspheric.

### Claim 18 (depends on 17)

The optical imaging lens assembly of claim 17, wherein a vertical distance between a convex critical point closest to a maximum effective radius position on the image-side surface of the sixth lens element and an optical axis is Yc62, a vertical distance between a convex critical point closest to a maximum effective radius position on the image-side surface of the seventh lens element and the optical axis is Yc72, and the following condition is satisfied:
0.50<|Yc62/Yc72|<1.5.

### Claim 19 (depends on 15)

The optical imaging lens assembly of claim 15, wherein the third lens element has an object-side surface being convex in a paraxial region thereof, the object-side surface of the third lens element has at least one critical point in an off-axis region thereof, and the object-side surface and the image-side surface of the third lens element are both aspheric.

### Claim 20 (depends on 15)

The optical imaging lens assembly of claim 15, wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, the maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:
1.0<Td/|Y72|<1.60.

### Claim 21 (depends on 15)

The optical 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 maximum image height of the optical imaging lens assembly is ImgH, an f-number of the optical imaging lens assembly is Fno, and the following conditions are satisfied:
TL/ImgH<2.0; and
1.0<Fno<2.40.

### Claim 22 (depends on 15)

The optical imaging lens assembly of claim 15, wherein a maximum effective radius of the object-side surface of the first lens element is Y11, the maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:
|Y11/Y72|<1.20.

### Claim 23 (depends on 15)

The optical imaging lens assembly of claim 15, further comprising an aperture stop, wherein a maximum effective radius of the object-side surface of the first lens element is Y11, an aperture radius of the aperture stop is Ystop, and the following condition is satisfied:
|Y11/Ystop|<2.0.

### Claim 24 (depends on 15)

The optical imaging lens assembly of claim 15, wherein the fifth lens element has an image-side surface being convex in a paraxial region thereof.

### Claim 25 (depends on 15)

The optical imaging lens assembly of claim 15, wherein the first lens element has an image-side surface being convex in a paraxial region thereof.

### Claim 26 (depends on 15)

The optical imaging lens assembly of claim 15, wherein a number of lens elements having an Abbe number smaller than 20 among the seven lens elements is V20, and the following condition is satisfied:
2≤V20.