# US 2019/0170983 A1 · Imaging lens assembly

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- Number: US 2019/0170983 A1
- Document ID: US20190170983A1
- Status: Published application
- Kind: A1
- Application number: 16/273,447
- Filed: 2019-02-12
- Published: 2019-06-06
- Earliest claimed: 2017-09-18
- Assignees: Zhejiang Sunny Optical Co., Ltd
- Applicants: Zhejiang Sunny Optical Co., Ltd
- Inventors: Ming LI; Jianke WENREN
- Web page: https://patentgrep.com/patent/US20190170983A1

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B 7/028: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation}
- G02B 9/62: having six components only
- G02B 13/0055: {employing a special optical element}
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present disclosure discloses an imaging lens assembly. The imaging lens assembly includes, sequentially from an object side to an image side of the imaging lens assembly, a first lens having a positive refractive power and a convex object-side surface; a second lens having a negative refractive power and a concave image-side surface; and at least one subsequent lens. At least one of the first lens, the second lens, or the at least one subsequent lens is a glass aspheric lens. A transmittance T1 of the imaging lens assembly corresponding to a wave band 650 nm satisfies: T1>85%, a transmittance T2 of the imaging lens assembly corresponding to a wave band 490 nm satisfies: T2>88%, and a transmittance T3 of the imaging lens assembly corresponding to a wave band 430 nm satisfies: T3>75%.

## Claims

### Claim 1

An imaging lens assembly comprising, sequentially from an object side to an image side of the imaging lens assembly,
a first lens having a positive refractive power and a convex object-side surface;
a second lens having a negative refractive power and a concave image-side surface; and
at least one subsequent lens,
wherein at least one of the first lens, the second lens, or the at least one subsequent lens is a glass aspheric lens,
a transmittance T1 of the imaging lens assembly corresponding to a wave band 650 nm satisfies: T1>85%,
a transmittance T2 of the imaging lens assembly corresponding to a wave band 490 nm satisfies: T2>88%, and
a transmittance T3 of the imaging lens assembly corresponding to a wave band 430 nm satisfies: T3>75%.

### Claim 2 (depends on 1)

The imaging lens assembly according to claim 1, wherein an influence ratio dng/dt of a unit temperature to a unit refractive index of the glass aspheric lens and a influence ratio dni/dt of a unit temperature to a unit refractive index of a lens closest to the image side satisfy: |dng/dt|/|dni/dt|<0.1.

### Claim 3 (depends on 1)

The imaging lens assembly according to claim 1, wherein an abbe number Vg of the glass aspheric lens and an abbe number Vi of a lens closest to the image side satisfy: 0.35<Vg/Vi<1.5.

### Claim 4 (depends on 1)

The imaging lens assembly according to claim 1, wherein a refractive index Ng of the glass aspheric lens satisfies: 1.5≤Ng≤2.0.

### Claim 5 (depends on 3)

The imaging lens assembly according to claim 3, wherein an effective focal length f of the imaging lens assembly and an entrance pupil diameter EPD of the imaging lens assembly satisfy: 1.5<f/EPD<2.5.

### Claim 6 (depends on 5)

The imaging lens assembly according to claim 5, wherein the effective focal length f of the imaging lens assembly and an effective focal length fg of the glass aspheric lens satisfy: −0.6<f/fg<1.2.

### Claim 7 (depends on 1)

The imaging lens assembly according to claim 1, wherein an effective focal length f of the imaging lens assembly and a radius of curvature R1 of the object-side surface of the first lens satisfy: 2<f/R1<4.

### Claim 8 (depends on 7)

The imaging lens assembly according to claim 7, wherein the radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 0<R1/R4<1.0.

### Claim 9

An imaging lens assembly comprising, sequentially from an object side to an image side of the imaging lens assembly,
a first lens;
a second lens; and
at least one subsequent lens,
wherein at least one of the first lens, the second lens, or the at least one subsequent lens is a glass aspheric lens, and an influence ratio dng/dt of a unit temperature to a unit refractive index of the glass aspheric lens and an influence ratio dni/dt of a unit temperature to a unit refractive index of a lens closest to the image side satisfy: |dng/dt|/|dni/dt|<0.1.

### Claim 10 (depends on 9)

The imaging lens assembly according to claim 9, wherein the first lens has a positive refractive power, an object-side surface of the first lens is a convex surface, the second lens has a negative refractive power, and an image-side surface of the second lens is a concave surface.

### Claim 11 (depends on 9)

The imaging lens assembly according to claim 9, wherein a transmittance T1 of the imaging lens assembly corresponding to a wave band 650 nm satisfies: T1>85%, a transmittance T2 of the imaging lens assembly corresponding to a wave band 490 nm satisfies: T2>88%, and a transmittance T3 of the imaging lens assembly corresponding to a wave band 430 nm satisfies: T3>75%.

### Claim 12 (depends on 9)

The imaging lens assembly according to claim 9, wherein an abbe number Vg of the glass aspheric lens and an abbe number Vi of the lens closest to the image side satisfy: 0.35<Vg/Vi<1.5.

### Claim 13 (depends on 9)

The imaging lens assembly according to claim 9, wherein a refractive index Ng of the glass aspheric lens satisfies: 1.5≤Ng≤2.0.

### Claim 14 (depends on 9)

The imaging lens assembly according to claim 9, wherein an effective focal length f of the imaging lens assembly and an entrance pupil diameter EPD of the imaging lens assembly satisfy: 1.5<f/EPD<2.5.

### Claim 15 (depends on 14)

The imaging lens assembly according to claim 14, wherein the effective focal length f of the imaging lens assembly and an effective focal length fg of the glass aspheric lens satisfy: −0.6<f/fg<1.2.

### Claim 16 (depends on 10)

The imaging lens assembly according to claim 10, wherein an effective focal length f of the imaging lens assembly and a radius of curvature R1 of the object-side surface of the first lens satisfy: 2<f/R1<4.

### Claim 17 (depends on 16)

The imaging lens assembly according to claim 16, wherein the radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 0<R1/R4<1.0.

### Claim 18

An imaging lens assembly comprising, sequentially from an object side to an image side of the imaging lens assembly,
a first lens having a positive refractive power and a convex object-side surface;
a second lens having a negative refractive power and a concave image-side surface; and
at least one subsequent lens,
wherein at least one of the first lens, the second lens, or the at least one subsequent lens is a glass aspheric lens, and
an effective focal length f of the imaging lens assembly and a radius of curvature R1 of the object-side surface of the first lens satisfy: 2<f/R1<4.

### Claim 19 (depends on 18)

The imaging lens assembly according to claim 18, wherein an abbe number Vg of the glass aspheric lens and an abbe number Vi of a lens closest to the image side satisfy: 0.35<Vg/Vi<1.5.

### Claim 20 (depends on 19)

The imaging lens assembly according to claim 19, wherein a transmittance T1 of the imaging lens assembly corresponding to a wave band 650 nm satisfies: T1>85%, a transmittance T2 of the imaging lens assembly corresponding to a wave band 490 nm satisfies: T2>88%, and a transmittance T3 of the imaging lens assembly corresponding to a wave band 430 nm satisfies: T3>75%.