# US 12,000,992 B2 · Optical imaging system and camera device including five lenses of ++−+−, ++−−−or ++−−+ refractive powers

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- Number: US 12,000,992 B2
- Document ID: US12000992B2
- Status: Granted
- Kind: B2
- Application number: 17/833,802
- Filed: 2022-06-06
- Published: 2022-09-29
- Granted: 2024-06-04
- Earliest claimed: 2016-11-15
- Assignees: Zhejiang Sunny Optical Co., Ltd
- Applicants: Zhejiang Sunny Optical Co., Ltd
- Inventors: Saifeng Lv; Fujian Dai
- Web page: https://patentgrep.com/patent/US12000992B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/60: having five components only
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present disclosure provides an optical imaging system and a camera device equipped with the optical imaging system. The optical imaging system includes sequentially, from an object side to an image side along an optical axis, a first lens having a positive refractive power, wherein an image-side surface of the first lens gradually changes from a paraxial concave surface to an edge convex surface as the image-side surface moves away from the optical axis; a second lens having a positive refractive power, wherein an object-side surface of the second lens is a convex surface, and an image-side surface of the second lens is a convex surface; a third lens having a negative refractive power; a fourth lens having a positive refractive power or a negative refractive power; and a fifth lens having a positive refractive power or a negative refractive power, wherein an object-side surface of the fifth lens is a convex surface at a paraxial position, and an image-side surface of the fifth lens is a concave surface at a paraxial position. A combined refractive power of the fourth lens and the fifth lens is a negative refractive power.

## Claims

### Claim 1

An optical imaging system comprising sequentially, from an object side to an image side along an optical axis, a first lens assembly having a positive refractive power, a second lens assembly having a negative refractive power and at least one subsequent lens assembly,
wherein the first lens assembly comprises a first lens and a second lens having positive refractive powers;
the second lens assembly comprises a third lens having a negative refractive power;
the at least one subsequent lens assembly comprises a third lens assembly having a negative refractive power, and the third lens assembly comprises a fourth lens having a refractive power; and
an image-side surface of the first lens gradually changes from a concave surface to a convex surface as the image-side surface moves away from the optical axis,
wherein a center thickness CT3 of the third lens and a center thickness CT4 of the fourth lens satisfy: CT3/CT4≤0.4.

### Claim 2 (depends on 1)

The optical imaging system according to claim 1, wherein a combined focal length f12 of the first lens and the second lens and an effective focal length f3 of the third lens satisfy: −0.5<f12/f3<0.

### Claim 3 (depends on 1)

The optical imaging system according to claim 1, wherein an object-side surface and an image-side surface of the second lens are convex surfaces.

### Claim 4 (depends on 1)

The optical imaging system according to claim 1, wherein a total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD≤2.0.

### Claim 5 (depends on 1)

The optical imaging system according to claim 1, wherein an effective focal length f1 of the first lens and a total effective focal length f of the optical imaging system satisfy: 0.3≤f/f1≤0.5.

### Claim 6 (depends on 1)

The optical imaging system according to claim 1, wherein an effective focal length f2 of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy: f2/|R4|≤0.6.

### Claim 7 (depends on 1)

The optical imaging system according to claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy: 0<(R5−R6)/(R5+R6)<0.5.

### Claim 8 (depends on 1)

The optical imaging system according to claim 1, wherein a radius of curvature R4 of an image-side surface of the second lens and a radius of curvature R5 of an object-side surface of the third lens satisfy: −1.2<R5/R4<0.

### Claim 9 (depends on 1)

The optical imaging system according to claim 1, wherein an abbe number V3 of the third lens and an abbe number V4 of the fourth lens satisfy: |V3−V4|≤10.

### Claim 10 (depends on 1)

The optical imaging system according to claim 1, wherein a radius of curvature R7 of an object-side surface of the fourth lens and the total effective focal length f of the optical imaging system satisfy: f/|R7|≤0.6.

### Claim 11 (depends on 1)

The optical imaging system according to claim 1, wherein a spacing distance T34 between the third lens and the fourth lens on the optical axis and an axial distance TTL from an object-side surface of the first lens to an image plane of the optical imaging system satisfy: T34/TTL<0.2.

### Claim 12 (depends on 1)

The optical imaging system according to claim 1, wherein the third lens assembly further comprises a fifth lens having a refractive power,
wherein an object-side surface of the fifth lens is a convex surface at a paraxial position, and an image-side surface of the fifth lens is a concave surface at a paraxial position.

### Claim 13 (depends on 12)

The optical imaging system according to claim 12, wherein a combined focal length f45 of the fourth lens and the fifth lens and the total effective focal length f of the optical imaging system satisfy: −0.5<f/f45<0.

### Claim 14 (depends on 1)

A camera device, comprising the optical imaging system according to claim 1.