# US 2025/0147276 A1 · Optical imaging system

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- Number: US 2025/0147276 A1
- Document ID: US20250147276A1
- Status: Published application
- Kind: A1
- Application number: 19/012,380
- Filed: 2025-01-07
- Published: 2025-05-08
- Earliest claimed: 2016-12-20
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Tae Youn LEE; Yong Joo JO
- Web page: https://patentgrep.com/patent/US20250147276A1

## CPC

- G02B 9/62: having six components only
- G02B 9/04: having two components only
- G02B 9/60: having five components only
- G02B 13/0045: {having five or more lenses}
- H04M 1/0264: {for a camera module assembly}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)

## Abstract

An optical imaging system includes a first lens group having a first group of lenses. A foremost lens of the first group of lenses is a lens closest to an object side and has a positive refractive power. The optical imaging system also includes a second lens group having a second group of lenses. A rearmost lens of the second group of lenses is a lens closest to an imaging plane and has convex surfaces. The first and second lens groups are sequentially disposed from the object side to an imaging plane. An expression TL/f1<2.0 is satisfied, where TL represents a distance from an object-side surface of the foremost lens to the imaging plane and f1 represents a focal length of the foremost lens.

## Claims

### Claim 1

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 a refractive power;
a fifth lens comprising a refractive power, and
a sixth lens comprising a refractive power,
wherein the first to the sixth lenses are sequentially disposed from an object side to an imaging plane,
wherein a sign of refractive power of the fourth lens is different from a sign of refractive power of the fifth lens,
wherein a radius of curvature of an object-side surface of the third lens is greater than a radius of curvature of an image-side surface of the sixth lens,
wherein a radius of curvature of an image-side surface of the third lens is greater than a radius of curvature of an object-side surface of the fourth lens, and
wherein −3.5<f/f3<−0.4, where f3 is a focal length of the third lens.

### Claim 2 (depends on 1)

The optical imaging system of claim 1, wherein the first lens has a convex object-side surface.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

The optical imaging system of claim 1, wherein the third lens has a concave object-side surface.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

The optical imaging system of claim 1, wherein the fourth lens has a convex object-side surface.

### Claim 7 (depends on 1)

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

### Claim 8

An optical imaging system, comprising:
a first lens comprising a concave image-side surface;
a second lens comprising a concave image-side surface;
a third lens comprising a refractive power;
a fourth lens comprising a refractive power; and
a fifth lens comprising a refractive power,
wherein the first to the fifth lenses are sequentially disposed from an object side to an imaging plane,
wherein a sign of refractive power of the fourth lens is different from a sign of refractive power of the fifth lens,
wherein a radius of curvature of an image-side surface of the third lens is greater than a radius of curvature of an object-side surface of the fourth lens, and
wherein −3.5<f/f3<−0.4, where f3 is a focal length of the third lens.

### Claim 9 (depends on 8)

The optical imaging system of claim 8, wherein the first lens has a convex object-side surface.

### Claim 10 (depends on 8)

The optical imaging system of claim 8, wherein the third lens has a concave object-side surface.

### Claim 11 (depends on 8)

The optical imaging system of claim 8, wherein the fourth lens has a concave object-side surface.

### Claim 12 (depends on 8)

The optical imaging system of claim 8, wherein the fifth lens has a concave image-side surface.