# US 11,442,252 B2 · Optical imaging system

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- Number: US 11,442,252 B2
- Document ID: US11442252B2
- Status: Granted
- Kind: B2
- Application number: 16/779,998
- Filed: 2020-02-03
- Published: 2020-06-04
- Granted: 2022-09-13
- Earliest claimed: 2015-12-28
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Tae Youn Lee
- Web page: https://patentgrep.com/patent/US11442252B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical imaging system includes a first lens including a negative refractive power and a convex object-side surface, and a second lens including a convex object-side surface and a convex image-side surface. The optical imaging system also includes a third lens including a negative refractive power and a convex object-side surface, a fourth lens including a convex image-side surface, a fifth lens, and a sixth lens including an inflection point formed on an image-side surface thereof. The first to sixth lenses are sequentially disposed in an optical-axis direction.

## Claims

### Claim 1

An optical imaging system, comprising:
a first lens comprising a negative refractive power and a convex object-side surface;
a second lens comprising a convex object-side surface and a convex image-side surface;
a third lens comprising a negative refractive power and a convex object-side surface;
a fourth lens comprising a convex image-side surface;
a fifth lens; and
a sixth lens comprising an inflection point formed on an image-side surface thereof,
wherein the first to sixth lenses are sequentially disposed in an optical-axis direction, and
wherein TL/2Y<0.76 is satisfied, in which TL is a distance from the object-side surface of the first lens to an imaging plane, and 2Y is a diagonal length of the imaging plane.

### Claim 2 (depends on 1)

The optical imaging system of claim 1, wherein an image-side surface of the first lens is concave.

### Claim 3 (depends on 1)

The optical imaging system of claim 1, wherein an image-side surface of the third lens is concave.

### Claim 4 (depends on 1)

The optical imaging system of claim 1, wherein the fourth lens comprises a positive refractive power.

### Claim 5 (depends on 1)

The optical imaging system of claim 1, wherein the image-side surface of the sixth lens is concave.

### Claim 6 (depends on 1)

The optical imaging system of claim 1, wherein −3.0%<Dist1.0−Dist0.6<−1.0% is satisfied, in which Dist1.0 is a distortion ratio at a maximum height of an imaging plane, and Dist0.6 is a distortion ratio at a point corresponding to 60% of the maximum height of the imaging plane.

### Claim 7 (depends on 1)

The optical imaging system of claim 1, wherein 0.5<f/f2<1.7 is satisfied, in which f is an overall focal length of the optical imaging system, and f2 is a focal length of the second lens.

### Claim 8 (depends on 1)

The optical imaging system of claim 1, wherein −0.7<f/f3<−0.2 is satisfied, in which f is an overall focal length of the optical imaging system, and f3 is a focal length of the third lens.

### Claim 9 (depends on 1)

The optical imaging system of claim 1, wherein 0.9<tan θ is satisfied, in which θ is a half of a field of view of the optical imaging system.

### Claim 10 (depends on 1)

The optical imaging system of claim 1, wherein 0.7<t1+t3+t5<0.9 is satisfied, in which t1 is a thickness of an optical axis center of the first lens, t3 is a thickness of an optical axis center of the third lens, and t5 is a thickness of an optical axis center of the fifth lens.

### Claim 11 (depends on 1)

The optical imaging system of claim 1, wherein 1.63<n1<1.67 is satisfied, in which n1 is a refractive index of the first lens.

### Claim 12 (depends on 1)

The optical imaging system of claim 1, wherein 41.0<V1+V3<46.0 is satisfied, in which V1 is an Abbe number of the first lens, and V3 is an Abbe number of the third lens.

### Claim 13 (depends on 1)

The optical imaging system of claim 1, wherein f/EPD<2.1 is satisfied, in which f is an overall focal length of the optical imaging system, and EPD is an entrance pupil diameter of the optical imaging system.

### Claim 14 (depends on 1)

The optical imaging system of claim 1, wherein −4.5<R21/R22<−1.3 is satisfied, in which R21 is a radius of curvature of an object-side surface of the second lens, and R22 is a radius of curvature of an image-side surface of the second lens.

### Claim 15

An optical imaging system, comprising:
a first lens comprising a negative refractive power and a convex object-side surface;
a second lens;
a third lens comprising a convex object-side surface;
a fourth lens comprising a positive refractive power and a concave object-side surface;
a fifth lens; and
a sixth lens comprising an inflection point formed on an image-side surface thereof,
wherein the first to sixth lenses are sequentially disposed in an optical-axis direction, and
wherein TL/2Y<0.76 is satisfied, in which TL is a distance from the object-side surface of the first lens to an imaging plane, and 2Y is a diagonal length of the imaging plane.

### Claim 16

An optical imaging system, comprising:
a first lens comprising a negative refractive power and a convex object-side surface;
a second lens comprising a convex object-side surface and a convex image-side surface;
a third lens comprising a negative refractive power and a convex object-side surface;
a fourth lens comprising a positive refractive power and a convex image-side surface;
a fifth lens; and
a sixth lens comprising an inflection point formed on an image-side surface thereof,
wherein the first to sixth lenses are sequentially disposed in an optical-axis direction.

### Claim 17 (depends on 16)

The optical imaging system of claim 16, wherein an image-side surface of the first lens is concave.

### Claim 18 (depends on 16)

The optical imaging system of claim 16, wherein an image-side surface of the third lens is concave.

### Claim 19 (depends on 16)

The optical imaging system of claim 16, wherein the image-side surface of the sixth lens is concave.