# US 2019/0196144 A1 · Imaging optical lens system, image capturing unit and electronic device

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- Number: US 2019/0196144 A1
- Document ID: US20190196144A1
- Status: Published application
- Kind: A1
- Application number: 15/870,806
- Filed: 2018-01-12
- Published: 2019-06-27
- Earliest claimed: 2017-12-22
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Hung-Shuo CHEN; Tzu-Chieh KUO
- Web page: https://patentgrep.com/patent/US20190196144A1

## CPC

- G02B 9/64: having more than six components
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B 13/0045: {having five or more lenses}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging optical lens system 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. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The object-side surface of the first lens element is convex in a paraxial region thereof. The second lens element has positive refractive power. The third lens element has negative refractive power. At least one surface among the object-side surfaces and the image-side surfaces of the seven lens elements has at least one critical point in an off-axis region thereof.

## Claims

### Claim 1

An imaging optical lens system 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; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, the object-side surface of the first lens element being convex in a paraxial region thereof, the second lens element having positive refractive power, and the third lens element having negative refractive power;
wherein at least one surface among the object-side surfaces and the image-side surfaces of the seven lens elements has at least one critical point in an off-axis region thereof, an Abbe number of the first lens element is V1, an Abbe number of the fourth lens element is V4, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, a focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following conditions are satisfied:
1.20<V1/V4<5.50;
0<(R3+R4)/(R3−R4); and
|f2/f1|<3.00.

### Claim 2 (depends on 1)

The imaging optical lens system of claim 1, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following condition is satisfied:
|f2/f1|<0.80.

### Claim 3 (depends on 1)

The imaging optical lens system of claim 1, wherein a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following condition is satisfied:
1.50<|R9/R10|.

### Claim 4 (depends on 1)

The imaging optical lens system of claim 1, wherein an Abbe number of the third lens element is V3, the Abbe number of the fourth lens element is V4, and the following condition is satisfied:
10.0<V3+V4<65.0.

### Claim 5 (depends on 1)

The imaging optical lens system of claim 1, wherein a central thickness of the second lens element is CT2, a central thickness of the seventh lens element is CT7, and the following condition is satisfied:
0<CT7/CT2<1.20.

### Claim 6 (depends on 1)

The imaging optical lens system of claim 1, wherein a focal length of the imaging optical lens system is f, a curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:
0≤f/R8.

### Claim 7 (depends on 1)

The imaging optical lens system of claim 1, wherein a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following condition is satisfied:
0≤f3/f4<1.0.

### Claim 8 (depends on 1)

The imaging optical lens system of claim 1, wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the imaging optical lens system is EPD, half of a maximum field of view of the imaging optical lens system is HFOV, and the following conditions are satisfied:
1.0 [mm]<TL<7.0 [mm];
0.8<TL/EPD<2.6; and
25.0[deg.]<HFOV<75.0[deg.].

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

The imaging optical lens system of claim 1, wherein the fifth lens element has positive refractive power, the object-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element is convex in a paraxial region thereof.

### Claim 11 (depends on 1)

The imaging optical lens system of claim 1, wherein the image-side surface of the sixth lens element has at least one critical point in an off-axis region thereof, the image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof, a vertical distance between the at least one critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, a vertical distance between the at least one critical point on the image-side surface of the seventh lens element and the optical axis is Yc72, and the following condition is satisfied:
0<Yc62/Yc72<2.0.

### Claim 12 (depends on 1)

The imaging optical lens system of claim 1, wherein the seventh lens element has negative refractive power, the image-side surface of the seventh lens element is concave in a paraxial region thereof, the image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof, a focal length of the imaging optical lens system is f, a focal length of the seventh lens element is f7, and the following condition is satisfied:
−1.35<f/f7<−0.75.

### Claim 13 (depends on 1)

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

### Claim 14 (depends on 1)

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

### Claim 15 (depends on 14)

An electronic device, comprising:
the image capturing unit of claim 14.

### Claim 16

An imaging optical lens system 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; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, the image-side surface of the second lens element being convex in a paraxial region thereof, the third lens element having negative refractive power, the object-side surface of the fifth lens element being concave in a paraxial region thereof, and the object-side surface of the seventh lens element being convex in a paraxial region thereof;
wherein at least one surface among the object-side surfaces and the image-side surfaces of the seven lens elements has at least one critical point in an off-axis region thereof, an Abbe number of the first lens element is V1, an Abbe number of the fourth lens element is V4, a focal length of the third lens element is f3, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
1.10<V1/V4<6.50; and
|f5/f3|<0.80.

### Claim 17 (depends on 16)

The imaging optical lens system of claim 16, wherein the Abbe number of the first lens element is V1, the Abbe number of the fourth lens element is V4, and the following condition is satisfied:
1.55<V1/V4<4.50.

### Claim 18 (depends on 16)

The imaging optical lens system of claim 16, wherein a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, and the following condition is satisfied:
−0.50<(R3+R4)/(R3−R4).

### Claim 19 (depends on 16)

The imaging optical lens system of claim 16, wherein a central thickness of the first lens element is CT1, an axial distance between the first lens element and the second lens element is T12, and the following condition is satisfied:
0<CT1/T12<3.5.

### Claim 20 (depends on 16)

The imaging optical lens system of claim 16, wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the imaging optical lens system is EPD, a maximum image height of the imaging optical lens system is ImgH, and the following conditions are satisfied:
1.0 [mm]<TL<7.0 [mm];
0.8<TL/EPD<2.6; and
0.8<TL/ImgH≤1.6.

### Claim 21 (depends on 16)

The imaging optical lens system of claim 16, wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the seventh lens element is concave in a paraxial region thereof, an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the sixth lens element and the seventh lens element is T67, a focal length of the imaging optical lens system is f, a curvature radius of the image-side surface of the seventh lens element is R14, and the following conditions are satisfied:
0<TD/(T34+T67)<10.0; and
0.60<f/R14<8.0.

### Claim 22 (depends on 16)

The imaging optical lens system of claim 16, wherein the image-side surface of the sixth lens element has at least one critical point in an off-axis region thereof, the image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof, a vertical distance between the at least one critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, a vertical distance between the at least one critical point on the image-side surface of the seventh lens element and the optical axis is Yc72, and the following condition is satisfied:
0<Yc62/Yc72<2.0.

### Claim 23

An imaging optical lens system 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; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, the image-side surface of the second lens element being convex in a paraxial region thereof, the object-side surface of the fifth lens element being concave in a paraxial region thereof, and the object-side surface of the seventh lens element being convex in a paraxial region thereof;
wherein at least one surface among the object-side surfaces and the image-side surfaces of the seven lens elements has at least one critical point in an off-axis region thereof, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
−0.50<(R3+R4)/(R3−R4); and
1.85<|R9/R10|.

### Claim 24 (depends on 23)

The imaging optical lens system of claim 23, wherein the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and the following condition is satisfied:
−0.15<(R3+R4)/(R3−R4).

### Claim 25 (depends on 23)

The imaging optical lens system of claim 23, wherein an Abbe number of the first lens element is V1, an Abbe number of the fourth lens element is V4, and the following condition is satisfied:
1.45<V1/V4<5.00.

### Claim 26 (depends on 23)

The imaging optical lens system of claim 23, wherein a focal length of the imaging optical lens system is f, a curvature radius of the object-side surface of the first lens element is R1, and the following condition is satisfied:
−1.0<f/R1<1.5.

### Claim 27 (depends on 23)

The imaging optical lens system of claim 23, wherein 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:
0≤f7/f6.

### Claim 28 (depends on 23)

The imaging optical lens system of claim 23, wherein the fifth lens element has positive refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof, a focal length of the second lens element is f2, a focal length of the fifth lens element is f5, and the following condition is satisfied:
0<f5/f2<1.24.

### Claim 29 (depends on 23)

The imaging optical lens system of claim 23, wherein the image-side surface of the sixth lens element has at least one critical point in an off-axis region thereof, the image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof, an f-number of the imaging optical lens system is Fno, half of a maximum field of view of the imaging optical lens system is HFOV, a vertical distance between the at least one critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, a vertical distance between the at least one critical point on the image-side surface of the seventh lens element and the optical axis is Yc72, and the following conditions are satisfied:
1.0<Fno<2.0;
25.0[deg.]<HFOV<75.0[deg.]; and
0<Yc62/Yc72<2.0.