# US 12,007,536 B2 · Photographing optical lens system, image capturing unit and electronic device

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- Number: US 12,007,536 B2
- Document ID: US12007536B2
- Status: Granted
- Kind: B2
- Application number: 18/136,205
- Filed: 2023-04-18
- Published: 2023-08-10
- Granted: 2024-06-11
- Earliest claimed: 2015-08-11
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Wei-Yu Chen
- Web page: https://patentgrep.com/patent/US12007536B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- G02B 5/208: {for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation}
- G02B 9/64: having more than six components
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A photographing optical lens system 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, a sixth lens element, a seventh lens element and an eighth lens element. The second lens element has positive refractive power. The eighth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the eighth lens element has at least one convex shape in an off-axis region thereof, and both an object-side surface and the image-side surface thereof are aspheric. The photographing optical lens system has a total of eight lens elements. An air gap in a paraxial region is located between every two lens elements of the photographing optical lens system that are adjacent to each other.

## Claims

### Claim 1

A photographing optical lens system comprising eight lens elements, the eight 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, a seventh lens element and an eighth lens element, and each of the eight lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the object-side surface of the seventh lens element is convex in a paraxial region thereof, and the image-side surface of the seventh lens element has at least one inflection point;
wherein an axial distance between the seventh lens element and the eighth lens element has a maximum value among axial distances between every two of the eight lens elements that are adjacent to each other;
wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element is Td, an entrance pupil diameter of the photographing optical lens system is EPD, and the following condition is satisfied:
Td/EPD<3.0.

### Claim 2 (depends on 1)

The photographing optical lens system of claim 1, wherein the object-side surface of the second lens element is convex in a paraxial region thereof.

### Claim 3 (depends on 1)

The photographing optical lens system of claim 1, wherein the image-side surface of the seventh lens element is concave in a paraxial region thereof, and the image-side surface of the seventh lens element has at least one convex critical point in an off-axis region thereof.

### Claim 4 (depends on 1)

The photographing optical lens system of claim 1, wherein the seventh lens element has positive refractive power, 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 photographing optical lens system is ImgH, and the following condition is satisfied:
TL/ImgH<3.0.

### Claim 5 (depends on 1)

The photographing optical lens system of claim 1, further comprising an aperture stop, wherein the object-side surface and the image-side surface of the eighth lens element are both aspheric, an axial distance between the aperture stop and the image-side surface of the eighth lens element is Sd, the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element is Td, and the following condition is satisfied:
0.70<Sd/Td<1.20.

### Claim 6 (depends on 1)

The photographing optical lens system of claim 1, wherein a sum of central thicknesses of all lens elements of the photographing optical lens system is ΣCT, an axial distance between the image-side surface of the eighth lens element and an image surface is BL, and the following condition is satisfied:
1.5<ΣCT/BL.

### Claim 7 (depends on 1)

The photographing optical lens system of claim 1, wherein a focal length of the photographing optical lens system is f, a composite focal length of the first lens element, the second lens element and the third lens element is f123, and the following condition is satisfied:
0.30<f/f123<1.5.

### Claim 8 (depends on 1)

The photographing optical lens system of claim 1, wherein a curvature radius of the object-side surface of the eighth lens element is R15, a curvature radius of the image-side surface of the eighth lens element is R16, and the following condition is satisfied:
−0.5<(R15+R16)/(R15−R16).

### Claim 9 (depends on 1)

The photographing optical lens system of claim 1, wherein 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 eighth lens element is Y82, and the following condition is satisfied:
Y11/Y82<1.25.

### Claim 10 (depends on 1)

The photographing optical lens system of claim 1, wherein a vertical distance between a non-axial critical point on the image-side surface of the eighth lens element and an optical axis is Yc82, a focal length of the photographing optical lens system is f, and the following condition is satisfied:
0.10<Yc82/f<0.80.

### Claim 11 (depends on 1)

The photographing optical lens system of claim 1, wherein a focal length of the second lens element is f2, a focal length of the seventh lens element is f7, and the following condition is satisfied:
1.0<|f7/f2|.

### Claim 12 (depends on 1)

An image capturing unit, comprising:
the photographing optical lens system of claim 1; and
an image sensor, wherein the image sensor is disposed on the image side of the photographing optical lens system.

### Claim 13 (depends on 12)

An electronic device, comprising:
the image capturing unit of claim 12.

### Claim 14

A photographing optical lens system comprising eight lens elements, the eight 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, a seventh lens element and an eighth lens element, and each of the eight lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the seventh lens element has at least one inflection point, the image-side surface of the eighth lens element is concave in a paraxial region thereof, and the image-side surface of the eighth lens element has at least one inflection point;
wherein an axial distance between the seventh lens element and the eighth lens element has a maximum value among axial distances between every two of the eight lens elements that are adjacent to each other;
wherein a curvature radius of the image-side surface of the eighth lens element is R16, a focal length of the photographing optical lens system is f, and the following condition is satisfied:
0.10<R16/f<1.0.

### Claim 15 (depends on 14)

The photographing optical lens system of claim 14, wherein the object-side surface of the seventh lens element has at least one inflection point, and the object-side surface and the image-side surface of each of the eight lens elements are both aspheric.

### Claim 16 (depends on 14)

The photographing optical lens system of claim 14, wherein the object-side surface of the seventh lens element has at least one concave critical point in an off-axis region thereof, and an air gap in a paraxial region is located between every two of the eight lens elements that are adjacent to each other.

### Claim 17 (depends on 14)

The photographing optical lens system of claim 14, wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element is Td, the focal length of the photographing optical lens system is f, and the following condition is satisfied:
Td/f<1.50.

### Claim 18 (depends on 14)

The photographing optical lens system of claim 14, 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 photographing optical lens system is ImgH, and the following condition is satisfied:
TL/ImgH<2.0.

### Claim 19 (depends on 14)

The photographing optical lens system of claim 14, wherein a maximum image height of the photographing optical lens system is ImgH, the focal length of the photographing optical lens system is f, and the following condition is satisfied:
0.65<ImgH/f<1.40.

### Claim 20 (depends on 14)

The photographing optical lens system of claim 14, wherein a sum of central thicknesses of all lens elements of the photographing optical lens system is ΣCT, an axial distance between the image-side surface of the eighth lens element and an image surface is BL, and the following condition is satisfied:
2.0<ΣCT/BL<10.

### Claim 21 (depends on 14)

The photographing optical lens system of claim 14, wherein a focal length of the second lens element is f2, a focal length of the seventh lens element is f7, and the following condition is satisfied:
|f7/f2|<1.0.