# US 12,111,445 B2 · Optical imaging system

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- Number: US 12,111,445 B2
- Document ID: US12111445B2
- Status: Granted
- Kind: B2
- Application number: 17/562,410
- Filed: 2021-12-27
- Published: 2022-04-21
- Granted: 2024-10-08
- Earliest claimed: 2016-12-28
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Ho Sik Yoo
- Web page: https://patentgrep.com/patent/US12111445B2

## CPC

- G02B 13/001: {Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence)}
- G02B 9/60: having five components only
- G02B 9/62: having six components only
- G02B 13/002: {having at least one aspherical surface}
- G02B 13/0045: {having five or more lenses}
- G02B 13/0065: {having a beam-folding prism or mirror}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G03B 17/17: with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

An optical imaging system includes: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having refractive power, a fifth lens having refractive power, and an image sensor on an image side of the fifth lens such that the fifth lens is most adjacent to the image sensor. The first to fifth lenses are sequentially disposed from an object side to an image side of the optical imaging system and the optical imaging system includes a total of five lenses. The optical imaging system satisfies 1.3<TTL/BFL<3.5, where TTL is a distance from an object-side surface of the first lens to an imaging plane of the image sensor, and BFL is a distance from an image-side surface of the fifth lens to the imaging plane of the image sensor.

## Claims

### Claim 1

An optical imaging system comprising:
a first lens having positive refractive power;
a second lens having negative refractive power;
a third lens having negative refractive power;
a fourth lens having refractive power; and
a fifth lens having refractive power; and
an image sensor disposed on an image side of the fifth lens such that the fifth lens is a lens disposed most adjacent to the image sensor,
wherein the first to fifth lenses are sequentially disposed from an object side of the optical imaging system to an image side of the optical imaging system,
wherein the optical imaging system includes a total of five lenses, and
wherein 1.3<TTL/BFL<3.5 is satisfied, where TTL is a distance from an object-side surface of the first lens to an imaging plane of the image sensor, and BFL is a distance from an image-side surface of the fifth lens to the imaging plane of the image sensor.

### Claim 2 (depends on 1)

The optical imaging system of claim 1, wherein FOV≤40° is satisfied, where FOV is a field of view of the optical imaging system.

### Claim 3 (depends on 1)

The optical imaging system of claim 1, wherein 0.9<DF/DC<1.3 is satisfied, where DF is an effective aperture radius of the image-side surface of the fifth lens, and DC is an effective aperture radius of the object-side surface of the first lens.

### Claim 4 (depends on 1)

The optical imaging system of claim 1, wherein 0.8<TTL/f<1.5 is satisfied, where f is an overall focal length of the optical imaging system.

### Claim 5 (depends on 1)

The optical imaging system of claim 1, wherein 0.6<f12/f<2.0 is satisfied, where f12 is a combined focal length of the first lens and the second lens, and f is an overall focal length of the optical imaging system.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 6)

The optical imaging system of claim 6, wherein the second lens has a convex object-side surface and a concave image-side surface.

### Claim 8 (depends on 7)

The optical imaging system of claim 7, wherein the first lens has a convex image-side surface, and the third lens has a convex object-side surface and a concave image-side surface.

### Claim 9 (depends on 7)

The optical imaging system of claim 7, wherein the fourth lens has a concave object-side surface and a convex image-side surface.

### Claim 10 (depends on 9)

The optical imaging system of claim 9, wherein the fourth lens has positive refractive power.

### Claim 11 (depends on 9)

The optical imaging system of claim 9, wherein the image-side surface of the fifth lens is concave.