# US 11,906,709 B2 · Optical imaging system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,906,709 B2
- Document ID: US11906709B2
- Status: Granted
- Kind: B2
- Application number: 18/087,256
- Filed: 2022-12-22
- Published: 2023-05-04
- Granted: 2024-02-20
- Earliest claimed: 2016-09-12
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Jin Hwa Jung; Yong Joo Jo
- Web page: https://patentgrep.com/patent/US11906709B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/64: having more than six components
- G02B 13/0015: {characterised by the lens design}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens, and a seventh lens having a positive refractive power. The first lens to seventh lens are sequentially disposed in a direction from an object side toward an imaging plane.

## Claims

### Claim 1

An optical imaging system, comprising:
a first lens comprising a convex object-side surface;
a second lens comprising a refractive power;
a third lens comprising a convex object-side surface;
a fourth lens comprising negative refractive power and a convex object-side surface;
a fifth lens comprising negative refractive power;
a sixth lens comprising a concave image-side surface; and
a seventh lens comprising a refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side to an image plane, and
wherein a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens is greater than a thickness along an optical axis of the fifth lens.

### Claim 2 (depends on 1)

The optical imaging system of claim 1, wherein BFL/f<0.15, where BFL represents a distance from an image-side surface of the seventh lens to the imaging plane and f is a focal length of the optical imaging system.

### Claim 3 (depends on 1)

The optical imaging system of claim 1, wherein 0.1<f/(IMG HT)<2.5, where IMG HT is a half diagonal length of the imaging plane and f is a focal length of the optical imaging system.

### Claim 4 (depends on 1)

The optical imaging system of claim 1, wherein 1.5<Nd7<1.7, where Nd7 represents a refractive index of the seventh lens.

### Claim 5 (depends on 1)

The optical imaging system of claim 1, wherein −45<f5/f<45, where f5 represents a focal length of the fifth lens and f is a focal length of the optical imaging system.

### Claim 6 (depends on 1)

The optical imaging system of claim 1, wherein 2.0<f/EPD<2.8, where EPD represents a diameter of an entrance pupil and f is a focal length of the optical imaging system.

### Claim 7 (depends on 1)

The optical imaging system of claim 1, wherein the first lens has positive refractive power.

### Claim 8 (depends on 1)

The optical imaging system of claim 1, wherein the second lens has negative refractive power.

### Claim 9 (depends on 1)

The optical imaging system of claim 1, wherein the third lens has negative refractive power.

### Claim 10

An optical imaging system, comprising:
a first lens comprising a refractive power;
a second lens comprising a concave image-side surface;
a third lens comprising a refractive power;
a fourth lens comprising negative refractive power and a convex object-side surface;
a fifth lens comprising a refractive power;
a sixth lens comprising a concave image-side surface; and
a seventh lens comprising a refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side to an image plane,
wherein a radius of curvature of an object-side surface of the second lens is greater than a radius of curvature of an image-side surface of the seventh lens, and
wherein BFL/f<0.15, where BFL represents a distance from an image-side surface of the seventh lens to the imaging plane and f is a focal length of the optical imaging system.

### Claim 11 (depends on 10)

The optical imaging system of claim 10, wherein 0.1<f/(IMG HT)<2.5, where IMG HT is a half diagonal length of the imaging plane.

### Claim 12 (depends on 10)

The optical imaging system of claim 10, wherein 1.5<Nd7<1.7, where Nd7 represents a refractive index of the seventh lens.

### Claim 13 (depends on 10)

The optical imaging system of claim 10, wherein −45<f5/f<45, where f5 represents a focal length of the fifth lens.

### Claim 14 (depends on 10)

The optical imaging system of claim 10, wherein 2.0<f/EPD<2.8, where EPD represents a diameter of an entrance pupil.

### Claim 15 (depends on 10)

The optical imaging system of claim 10, wherein the fifth lens has a concave object-side surface.

### Claim 16 (depends on 10)

The optical imaging system of claim 10, wherein the seventh lens has a convex object-side surface.