# US 11,906,710 B2 · Image capturing optical lens system

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- Number: US 11,906,710 B2
- Document ID: US11906710B2
- Status: Granted
- Kind: B2
- Application number: 18/148,539
- Filed: 2022-12-30
- Published: 2023-05-11
- Granted: 2024-02-20
- Earliest claimed: 2012-10-22
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Hsiang-Chi Tang; Tsung-Han Tsai; Hsin-Hsuan Huang
- Web page: https://patentgrep.com/patent/US11906710B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An image capturing 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, and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has refractive power. The third lens element with refractive power has a concave image-side surface. The fourth lens element has refractive power, and at least one surface thereof is aspheric. The fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, and the surfaces thereof are aspheric. The sixth lens element with refractive power has a convex object-side surface, and an image-side surface changing from concave at a paraxial region thereof to convex at a peripheral region thereof, and the surfaces are aspheric.

## Claims

### Claim 1

An image capturing optical lens system 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;
wherein each of the six lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side;
wherein the object-side surface of the second lens element is convex in a paraxial region thereof; the image-side surface of the sixth lens element is concave in a paraxial region thereof and comprises at least one convex shape in an off-axis region thereof;
wherein focal lengths of the third lens element and the fourth lens element have different signs;
wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the fifth lens element is V5, a maximum image height of the image capturing optical lens system is ImgH, an axial distance between the object-side surface of the first lens element and an image plane is TTL, and the following relationships are satisfied:
0.6<(V2+V5)/V1<1.0; and
TTL/ImgH≤1.70.

### Claim 2 (depends on 1)

The image capturing optical lens system of claim 1, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, the Abbe number of the fifth lens element is V5, and the following relationship is satisfied:
0.6<(V2+V5)/V1≤0.83.

### Claim 3 (depends on 1)

The image capturing optical lens system of claim 1, wherein the second lens element has negative refractive power; a focal length of the image capturing optical lens system is f, a focal length of the fifth lens element is f5, and the following relationship is satisfied:
−1.20<f/f5<−0.20.

### Claim 4 (depends on 1)

The image capturing optical lens system of claim 1, wherein the sixth lens element has positive refractive power; both of the object-side surface and the image-side surface of the sixth lens element are aspheric; the image-side surface of the fourth lens element is convex in a paraxial region thereof.

### Claim 5 (depends on 1)

The image capturing optical lens system of claim 1, wherein an axial distance between the image-side surface of the sixth lens element and the image plane is BFL, 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 relationship is satisfied:
0.15<BFL/Td<0.40.

### Claim 6 (depends on 1)

The image capturing optical lens system of claim 1, wherein a central thickness of the second lens element is CT2, an angle between a tangent of an inflection point on the image-side surface of the sixth lens element and an optical axis is α, and the following relationship is satisfied:
0 mm<CT2/tan(α)<0.15 mm.

### Claim 7 (depends on 1)

The image capturing optical lens system of claim 1, wherein an absolute value of the focal length of the fourth lens element is smaller than an absolute value of a focal length of the second lens element.

### Claim 8 (depends on 1)

The image capturing optical lens system of claim 1, wherein a central thickness of the third lens element is larger than a central thickness of the first lens element.

### Claim 9 (depends on 1)

The image capturing optical lens system of claim 1, wherein an absolute value of a curvature radius of the object-side surface of the third lens element is larger than an absolute value of a curvature radius of the object-side surface of the sixth lens element.

### Claim 10 (depends on 1)

The image capturing optical lens system of claim 1, wherein curvature radii of the image-side surface of the first lens element and the image-side surface of the third lens element have the same sign.

### Claim 11

An image capturing optical lens system 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;
wherein each of the six lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side;
wherein the first lens element has positive refractive power; the third lens element has positive refractive power; the sixth lens element has positive refractive power; the object-side surface of the second lens element is convex in a paraxial region thereof; the object-side surface of the third lens element is convex in a paraxial region thereof; the object-side surface of the sixth lens element is convex in a paraxial region thereof; the image-side surface of the sixth lens element is concave in a paraxial region thereof; both of the object-side surface and the image-side surface of the fifth lens element are aspheric;
wherein there is an air gap between each of adjacent lens elements of the six lens elements; an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, and the following relationship is satisfied:
0.20<V5/V6<0.70.

### Claim 12 (depends on 11)

The image capturing optical lens system of claim 11, wherein the object-side surface of the first lens element is convex in a paraxial region thereof; the image-side surface of the third lens element is convex in a paraxial region thereof.

### Claim 13 (depends on 11)

The image capturing optical lens system of claim 11, wherein a maximum image height of the image capturing optical lens system is ImgH, a focal length of the image capturing optical lens system is f, and the following relationship is satisfied:
0.72<ImgH/f<1.0.

### Claim 14 (depends on 11)

The image capturing optical lens system of claim 11, wherein a focal length of the second lens element is f2, a curvature radius of the image-side surface of the sixth lens element is R12, and the following relationship is satisfied:
−1.0<R12/f2<0.

### Claim 15 (depends on 11)

The image capturing optical lens system of claim 11, wherein curvature radii of the object-side surface of the fourth lens element and the object-side surface of the fifth lens element have different signs.

### Claim 16 (depends on 11)

The image capturing optical lens system of claim 11, wherein an axial distance between the second lens element and the third lens element is larger than an axial distance between the first lens element and the second lens element.

### Claim 17

An image capturing optical lens system 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;
wherein each of the six lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side;
wherein the fifth lens element has negative refractive power; the image-side surface of the first lens element is convex in a paraxial region thereof; the object-side surface of the second lens element is convex in a paraxial region thereof; the object-side surface of the sixth lens element is convex in a paraxial region thereof;
wherein focal lengths of the third lens element and the sixth lens element have the same sign; curvature radii of the image-side surface of the third lens element and the object-side surface of the fourth lens element have the same sign;
wherein there is an air gap between each of adjacent lens elements of the six lens elements; a maximum image height of the image capturing optical lens system is ImgH, an axial distance between the object-side surface of the first lens element and an image plane is TTL, and the following relationship is satisfied:
TTL/ImgH<1.8.

### Claim 18 (depends on 17)

The image capturing optical lens system of claim 17, wherein the first lens element has positive refractive power; the image-side surface of the second lens element is concave in a paraxial region thereof.

### Claim 19 (depends on 17)

The image capturing optical lens system of claim 17, wherein the image-side surface of the sixth lens element is concave in a paraxial region thereof and comprises at least one convex shape in an off-axis region thereof; a focal length of the second lens element is f2, a curvature radius of the image-side surface of the sixth lens element is R12, and the following relationship is satisfied:
−1.0<R12/f2<0.

### Claim 20 (depends on 17)

The image capturing optical lens system of claim 17, wherein an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, and the following relationship is satisfied:
0.20<V5/V6<0.70.

### Claim 21 (depends on 17)

The image capturing optical lens system of claim 17, wherein an absolute value of a curvature radius of the object-side surface of the first lens element is larger than an absolute value of a curvature radius of the image-side surface of the second lens element.

### Claim 22 (depends on 17)

The image capturing optical lens system of claim 17, wherein an absolute value of a focal length of the fifth lens element is larger than an absolute value of a focal length of the fourth lens element.

### Claim 23 (depends on 17)

The image capturing optical lens system of claim 17, further comprising:
an aperture stop, closer to the object side of the image capturing optical lens system than the third lens element.