# US 11,906,707 B2 · Imaging lens system having seven lenses of +−+−−+− or +−+−++− refractive powers

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- Number: US 11,906,707 B2
- Document ID: US11906707B2
- Status: Granted
- Kind: B2
- Application number: 17/578,775
- Filed: 2022-01-19
- Published: 2022-05-05
- Granted: 2024-02-20
- Earliest claimed: 2019-06-17
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Kil Soo Shin; Yong Joo Jo
- Web page: https://patentgrep.com/patent/US11906707B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/64: having more than six components
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed at intervals from an object side of the imaging lens system. The imaging lens system satisfies 1.5<Nd5<1.6, 30<V5<50, and TTL/2IH<0.730, where Nd5 is a refractive index of the fifth lens, V5 is an Abbe number of the fifth lens, TTL is a distance from an object side surface of the first lens to an imaging plane, and 21H is a diagonal length of the imaging plane.

## Claims

### Claim 1

An imaging lens system comprising:
a first lens comprising a convex object-side surface;
a second lens comprising a convex object-side surface;
a third lens comprising positive refractive power and a convex image-side surface in a paraxial region;
the third lens has a convex object-side surface;
a fourth lens comprising a concave image-side surface;
a fifth lens comprising negative refractive power and a convex object-side surface;
a sixth lens comprising a convex object-side surface and a concave image-side surface in a paraxial region; and
a seventh lens comprising a concave object-side surface,
wherein the first to seventh lenses are sequentially disposed from an object side of the imaging lens system, and
wherein an absolute value of a radius of curvature of an image-side surface of the first lens is greater than an absolute value of a radius of curvature of the object-side surface of the fifth lens.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

The imaging lens system of claim 1, wherein TTL/f<1.4, where TTL is a distance from the object-side surface of the first lens to an imaging plane.

### Claim 7 (depends on 1)

The imaging lens system of claim 1, wherein 1.5<f3/f, where f is a focal length of the imaging lens system and f3 is a focal length of the third lens.

### Claim 8 (depends on 1)

The imaging lens system of claim 1, wherein 1.5<Nd5<1.6, where Nd5 is a refractive index of the fifth lens.

### Claim 9 (depends on 1)

The imaging lens system of claim 1, wherein an F-number is 2.0 or less.

### Claim 10 (depends on 1)

The imaging lens system of claim 1, wherein 25<V1-V4<45, where V4 is an Abbe number of the fourth lens.