# US 2019/0170978 A1 · Telescopic 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 2019/0170978 A1
- Document ID: US20190170978A1
- Status: Published application
- Kind: A1
- Application number: 16/045,866
- Filed: 2018-07-26
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Jung Hui KO; Ju Hwa SON; Ju Sung PARK; Yong Joo JO
- Web page: https://patentgrep.com/patent/US20190170978A1

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B 13/02: Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical imaging system includes a first lens which has refractive power, a second lens which has refractive power, a third lens which has a convex object-side surface, and an inflection point is formed on an image-side surface thereof, a fourth lens which has refractive power, a fifth lens which has a convex object-side surface, and a sixth lens which has refractive power and an inflection point is formed on an image-side surface thereof, and wherein the first to sixth lens are sequentially disposed from an object side.

## Claims

### Claim 1

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

### Claim 2 (depends on 1)

The optical imaging system of claim 1, wherein an inflection point is formed on an image-side surface of the first lens.

### Claim 3 (depends on 1)

The optical imaging system of claim 1, wherein a sign of refractive power of the second lens is different from a sign of the refractive power of the first lens.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

The optical imaging system of claim 1, further comprising a stop disposed between the first lens and the second lens.

### Claim 11

An optical imaging system comprising:
a first lens which has refractive power and which has an inflection point formed on an image-side surface thereof,
a second lens which has refractive power;
a third lens which has refractive power;
a fourth lens which has refractive power;
a fifth lens of which an object-side surface is convex; and
a sixth lens which has refractive power and which has an inflection point formed on an image-side surface thereof,
wherein the first to sixth lenses are sequentially disposed from an object side.

### Claim 12 (depends on 11)

The optical imaging system of claim 11, wherein an inflection point is formed on an image-side surface of the third lens.

### Claim 13 (depends on 11)

The optical imaging system of claim 11, wherein an f-number of the optical imaging system is 2.0 or less.

### Claim 14 (depends on 11)

The optical imaging system of claim 11, wherein an entire field of view (FOV) of the optical imaging system is 80° or more.

### Claim 15 (depends on 11)

The optical imaging system of claim 11, wherein TTL/f<1.2 in which TTL is a distance from an object-side surface of the first lens to an imaging plane, and f is an overall focal length of the optical imaging system.

### Claim 16 (depends on 11)

The optical imaging system of claim 11, wherein f1/f<1.0 in which f is an overall focal length of the optical imaging system, and f1 is a focal length of the first lens.

### Claim 17

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

### Claim 18 (depends on 17)

The optical system of claim 17, wherein the first lens has a concave image-side surface.

### Claim 19 (depends on 17)

The optical system of claim 17, wherein inflection points are formed on the image-side surface of the first lens.

### Claim 20 (depends on 17)

The optical system of claim 17, wherein the fifth lens and/or the sixth lens has inflection points on the image-side surface and the object-side surface.