# US 2025/0085508 A1 · 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 2025/0085508 A1
- Document ID: US20250085508A1
- Status: Published application
- Kind: A1
- Application number: 18/661,818
- Filed: 2024-05-13
- Published: 2025-03-13
- Earliest claimed: 2023-09-13
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Seong Il CHO; Do Hyeong JANG; Dong Shin YANG; Woo Young KIM; Ho Bin GO
- Web page: https://patentgrep.com/patent/US20250085508A1

## CPC

- G02B 9/12: having three components only
- G02B 13/004: {having four lenses}
- G02B 9/34: having four components only
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B 27/0018: {with means for preventing ghost images (anti-reflection coatings G02B1/11)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side toward an image plane, wherein the first lens may be formed of glass, and wherein a conditional expression 70<v1 and 0.8≤OAL/f≤0.9 may be satisfied, where v1 is an Abbe number of the first lens, OAL is a distance from an object-side surface of the first lens to the image plane, and f is a total focal length of the optical imaging system.

## Claims

### Claim 1

An optical imaging system, comprising:
a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side toward an image plane,
wherein the first lens is formed of glass, and
wherein a conditional expression 70<v1 and 0.8≤OAL/f≤0.9 is satisfied,
where v1 is an Abbe number of the first lens, OAL is a distance from an object-side surface of the first lens to the image plane, and f is a total focal length of the optical imaging system.

### Claim 2 (depends on 1)

The optical imaging system according to claim 1,
wherein the first lens has positive refractive power, and
wherein a conditional expression 5<f1<10 is satisfied,
where f1 is a focal length of the first lens.

### Claim 3 (depends on 1)

The optical imaging system according to claim 1,
wherein the fourth lens has a convex image-side surface in a paraxial region.

### Claim 4 (depends on 1)

The optical imaging system according to claim 1,
wherein the fourth lens has a concave image-side surface in a paraxial region, and a convex surface in a peripheral region.

### Claim 5 (depends on 1)

The optical imaging system according to claim 1,
wherein a conditional expression 4<OAL/ΣCT<6 is satisfied,
where CT is a sum of thicknesses of the first lens to the third lens.

### Claim 6 (depends on 1)

The optical imaging system according to claim 1,
wherein the first lens is a D-cut lens, and a conditional expression 0.5<AR1<1.0 is satisfied,
where AR1 is an aspect ratio of an effective diameter of the first lens.

### Claim 7 (depends on 1)

The optical imaging system according to claim 1,
wherein a conditional expression 0.4≤d2/d1≤1.0 is satisfied,
where d1 is a distance between the first lens and the second lens, and d2 is a distance between the second lens and the third lens.

### Claim 8 (depends on 1)

The optical imaging system according to claim 1,
wherein the second lens has negative refractive power, and the second lens has a concave object-side surface in a paraxial region.

### Claim 9 (depends on 1)

The optical imaging system according to claim 1,
wherein the third lens has positive refractive power, and a conditional expression 1.3<|f/f2+f/f3|≤2.3 is satisfied,
where f2 is a focal length of the second lens, and f3 is a focal length of the third lens.

### Claim 10 (depends on 1)

The optical imaging system according to claim 1,
wherein a conditional expression 0.15<R1/f≤0.25 is satisfied,
where R1 is a radius of curvature of the object-side surface of the first lens.

### Claim 11

An optical imaging system, comprising:
a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side toward an image plane,
wherein conditional expressions 70<v1 and 0<v2−v3<15 are satisfied,
where v1 is an Abbe number of the first lens, v2 is an Abbe number of the second lens, and v3 is an Abbe number of the third lens.

### Claim 12 (depends on 11)

The optical imaging system according to claim 11,
wherein a conditional expression 0.5≤D4/D1≤0.8 is satisfied, where D1 is a maximum effective diameter of the first lens, and D4 is a maximum effective diameter of the fourth lens.

### Claim 13 (depends on 11)

The optical imaging system according to claim 11,
wherein in at least one of the second lens and the fourth lens, an object-side surface and an image-side surface thereof have a concave shape.

### Claim 14 (depends on 11)

The optical imaging system according to claim 11,
wherein the second lens has a convex image-side surface, and the fourth lens has a convex image-side surface.

### Claim 15 (depends on 11)

The optical imaging system according to claim 11,
wherein a conditional expression 0.8≤OAL/f≤0.9 is satisfied, where OAL is a distance from an object-side surface of the first lens to the image plane, and f is a total focal length of the optical imaging system.

### Claim 16 (depends on 11)

The optical imaging system according to claim 11,
wherein a conditional expression 0.4≤BFL/f≤0.6 is satisfied,
where BFL is a distance from an image-side surface of the fourth lens to the image plane, and f is a total focal length of the optical imaging system.