# US 12,216,253 B2 · Image capturing optical system, imaging apparatus and electronic device

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- Number: US 12,216,253 B2
- Document ID: US12216253B2
- Status: Granted
- Kind: B2
- Application number: 18/398,377
- Filed: 2023-12-28
- Published: 2024-04-25
- Granted: 2025-02-04
- Earliest claimed: 2017-02-18
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Po-Lun Hsu; Hsin-Hsuan Huang
- Web page: https://patentgrep.com/patent/US12216253B2

## CPC

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

## Abstract

An image capturing optical system includes 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. An image-side surface of the fifth lens element is convex in a paraxial region thereof. An image-side surface of the sixth lens element is concave in a paraxial region thereof. The seventh lens element has negative refractive power.

## Claims

### Claim 1

An image capturing optical 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; wherein each of the seven 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 first lens element is concave in a paraxial region thereof; the image-side surface of the fourth lens element is convex in a paraxial region thereof; the image-side surface of the seventh lens element comprises at least one convex critical point in an off-axis region thereof;
wherein the image capturing optical system further comprises an aperture stop disposed between the second lens element and the third lens element; an absolute value of a curvature radius of the image-side surface of the fifth lens element is larger than an absolute value of a curvature radius of the object-side surface of the fifth lens element.

### Claim 2 (depends on 1)

The image capturing optical system of claim 1, wherein the object-side surface of the second lens element is convex in a paraxial region thereof; a focal length of the first lens element is f1, a focal length of the third lens element is f3, and the following condition is satisfied:
−1.50<f3/f1<1.55.

### Claim 3 (depends on 1)

The image capturing optical system of claim 1, wherein the fifth lens element has negative refractive power; the image-side surface of the seventh lens element is concave in a paraxial region thereof; a curvature radius of the object-side surface of the second lens element is R3, 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, and the following condition is satisfied:
0.70<R3/TD<0.80.

### Claim 4 (depends on 1)

The image capturing optical system of claim 1, wherein the object-side surface of the first lens element comprises at least one inflection point in an off-axis region thereof; a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, and the following condition is satisfied:
|R5/R6|<4.50.

### Claim 5 (depends on 1)

The image capturing optical system of claim 1, wherein the object-side surface of the sixth lens element comprises at least one concave critical point in an off-axis region thereof; a maximum of chief ray angles of the image capturing optical system is CRAmax, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
35.0 degrees<CRAmax<50.0 degrees; and
TL<7.5 mm.

### Claim 6 (depends on 1)

The image capturing optical system of claim 1, wherein there is an air space between adjacent lens elements of the lens elements; a central thickness of the second lens element is larger than a central thickness of the sixth lens element.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The image capturing optical system of claim 1, wherein a maximum effective radius of the object-side surface of the first lens element is larger than a maximum effective radius of the image-side surface of the sixth lens element.

### Claim 9 (depends on 1)

An imaging apparatus, comprising:
the image capturing optical system of claim 1;
a driving apparatus connected to the image capturing optical system; and
an image sensor disposed on an image surface of the image capturing optical system.

### Claim 10 (depends on 9)

An electronic device, comprising:
the imaging apparatus of claim 9.

### Claim 11 (depends on 1)

The image capturing optical system of claim 1, wherein the seventh lens element has negative refractive power.