# US 10,310,236 B2 · Photographing optical lens assembly, image capturing unit and electronic device

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- Number: US 10,310,236 B2
- Document ID: US10310236B2
- Status: Granted
- Kind: B2
- Application number: 15/955,494
- Filed: 2018-04-17
- Published: 2018-08-16
- Granted: 2019-06-04
- Earliest claimed: 2014-08-01
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Wei-Yu Chen
- Web page: https://patentgrep.com/patent/US10310236B2

## CPC

- G02B 13/0045: {having five or more lenses}
- 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 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, a sixth lens element and a seventh lens element. The first lens element with refractive power has an object-side surface being convex in a paraxial region thereof. Each second, third, fourth and fifth lens element has refractive power. The sixth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, and both of the surfaces of the sixth lens element are aspheric. The seventh lens element with refractive power has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface has at least one convex shape in an off-axis region thereof.

## Claims

### Claim 1

A photographing optical 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 with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element;
a third lens element;
a fourth lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof;
a fifth lens element;
a sixth lens element having negative refractive power; and
a seventh lens element having negative refractive power;
wherein an Abbe number of the sixth lens element is V6, a maximum refractive index of one single lens element among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is Nmax, an f-number of the photographing optical lens assembly is Fno, and the following conditions are satisfied:
10<V6<32;
1.60<Nmax<1.70; and
Fno<2.0.

### Claim 2 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a minimum refractive index of one single lens element among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is Nmin, and the following condition is satisfied:
1.50<Nmin<1.60.

### Claim 3 (depends on 1)

The photographing optical lens assembly of claim 1, wherein the seventh lens element has an object-side surface being concave in a paraxial region thereof, and both the object-side surface and an image-side surface of the seventh lens element are aspheric.

### Claim 4 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a focal length of the photographing optical lens assembly is f, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following condition is satisfied:
−1.8<(f/f6)+(f/f7)<−0.5.

### Claim 5 (depends on 1)

The photographing optical lens assembly of claim 1, 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, an entrance pupil diameter of the photographing optical lens assembly is EPD, and the following condition is satisfied:
Td/EPD<3.0.

### Claim 6 (depends on 1)

The photographing optical lens assembly of claim 1, wherein an image-side surface of the sixth lens element has at least one concave shape in an off-axis region thereof.

### Claim 7 (depends on 1)

The photographing optical lens assembly of claim 1, further comprising an aperture stop disposed between an imaged object and an object-side surface of the third lens element, wherein an air gap in a paraxial region is located between every adjacent lens element among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element.

### Claim 8 (depends on 7)

The photographing optical lens assembly of claim 7, wherein the aperture stop is disposed between the imaged object and the object-side surface of the first lens element.

### Claim 9 (depends on 1)

The photographing optical 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 maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:
TL/ImgH<3.0.

### Claim 10 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a focal length of the photographing optical lens assembly is f, a focal length of the sixth lens element is f6, and the following condition is satisfied:
f6/f<−1.0.

### Claim 11 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a sum of central thicknesses of the first lens element through the seventh lens element is ΣCT, 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, and the following condition is satisfied:
0.60<ΣCT/Td<0.85.

### Claim 12 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a focal length of the photographing optical lens assembly is f, a composite focal length of the first lens element and the second lens element is f12, and the following condition is satisfied:
0.25<f/f12<1.5.

### Claim 13 (depends on 1)

The photographing optical lens assembly of claim 1, wherein an absolute value of a focal length of the fourth lens element is smaller than an absolute value of a focal length of the sixth lens element.

### Claim 14 (depends on 1)

The photographing optical lens assembly of claim 1, wherein an absolute value of a focal length of the fourth lens element is smaller than an absolute value of a focal length of the first lens element.

### Claim 15 (depends on 1)

The photographing optical lens assembly of claim 1, wherein an absolute value of a focal length of the seventh lens element is smaller than an absolute value of a focal length of the sixth lens element.

### Claim 16 (depends on 1)

The photographing optical lens assembly of claim 1, wherein an absolute value of a focal length of the first lens element is smaller than an absolute value of a focal length of the second lens element.

### Claim 17 (depends on 1)

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

### Claim 18 (depends on 17)

An electronic device, comprising:
the image capturing unit of claim 17.

### Claim 19

A photographing optical 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 with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element;
a third lens element;
a fourth lens element having positive refractive power;
a fifth lens element;
a sixth lens element having negative refractive power; and
a seventh lens element;
wherein an absolute value of a focal length of the fourth lens element is smaller than an absolute value of a focal length of the sixth lens element, an Abbe number of the sixth lens element is V6, a maximum refractive index of one single lens element among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is Nmax, 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, an entrance pupil diameter of the photographing optical lens assembly is EPD, and the following conditions are satisfied:
10<V6<26.6;
1.60<Nmax<1.70; and
Td/EPD<1.98.

### Claim 20 (depends on 19)

The photographing optical lens assembly of claim 19, wherein a sum of central thicknesses of the first lens element through the seventh lens element is ΣCT, 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, and the following condition is satisfied:
0.60<ΣCT/Td<0.85.

### Claim 21 (depends on 19)

The photographing optical lens assembly of claim 19, wherein an f-number of the photographing optical lens assembly is Fno, and the following condition is satisfied:
Fno<2.0.

### Claim 22 (depends on 19)

The photographing optical lens assembly of claim 19, wherein an image-side surface of the sixth lens element has at least one concave shape in an off-axis region thereof.

### Claim 23 (depends on 19)

The photographing optical lens assembly of claim 19, 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 assembly is ImgH, and the following condition is satisfied:
TL/ImgH<3.0.

### Claim 24 (depends on 23)

The photographing optical lens assembly of claim 23, wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, the maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:
TL/ImgH<2.2.

### Claim 25 (depends on 19)

The photographing optical lens assembly of claim 19, further comprising an aperture stop disposed between an imaged object and an object-side surface of the third lens element, wherein an air gap in a paraxial region is located between every adjacent lens element among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element.

### Claim 26 (depends on 19)

The photographing optical lens assembly of claim 19, wherein a focal length of the photographing optical lens assembly is f, the focal length of the sixth lens element is f6, and the following condition is satisfied:
f6/f<−1.0.

### Claim 27 (depends on 19)

An image capturing unit, comprising:
the photographing optical lens assembly of claim 19; and
an image sensor, wherein the image sensor is disposed on an image surface of the photographing optical lens assembly.

### Claim 28 (depends on 27)

An electronic device, comprising:
the image capturing unit of claim 27.