# US 12,216,332 B2 · Imaging lens assembly and electronic device

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- Number: US 12,216,332 B2
- Document ID: US12216332B2
- Status: Granted
- Kind: B2
- Application number: 17/545,001
- Filed: 2021-12-08
- Published: 2022-06-23
- Granted: 2025-02-04
- Earliest claimed: 2020-12-23
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd.
- Inventors: Chien-Pang Chang; Wen-Yu Tsai; Lin-An Chang; Ming-Ta Chou; Kuo-Chiang Chu
- Web page: https://patentgrep.com/patent/US12216332B2

## CPC

- G02B 9/04: having two components only
- G02B 13/001: {Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence)}
- C23C 16/40: Oxides
- G02B 1/041: {Lenses}
- G02B 1/11: Anti-reflection coatings
- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- G02B 27/0018: {with means for preventing ghost images (anti-reflection coatings G02B1/11)}
- G03B 17/12: with means for supporting objectives, supplementary lenses, filters, masks, or turrets
- G03B 30/00: Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- 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 imaging lens assembly has an optical axis and includes a plastic lens element set. The plastic lens element set includes two plastic lens elements and at least one anti-reflective layer. The two plastic lens elements, in order from an object side to an image side along the optical axis are a first plastic lens element and a second plastic lens element. The anti-reflective layer has a nanostructure and is disposed on at least one of an image-side surface of the first plastic lens element and an object-side surface of the second plastic lens element.

## Claims

### Claim 1

An imaging lens assembly, having an optical axis, comprising:
a plastic lens element set, comprising:
two plastic lens elements, in order from an object side to an image side along the optical axis being a first plastic lens element and a second plastic lens element; and
at least one anti-reflective layer, having a nanostructure, and disposed on at least one of an image-side surface of the first plastic lens element and an object-side surface of the second plastic lens element;
wherein a central distance between a paraxial region of the image-side surface of the first plastic lens element and a paraxial region of the object-side surface of the second plastic lens element is d, a minimum air gap between an off-axis region of the image-side surface of the first plastic lens element and an off-axis region of the object-side surface of the second plastic lens element is AG1, a peripheral air gap between an edge of an optical effective region of the image-side surface of the first plastic lens element and an edge of an optical effective region of the object-side surface of the second plastic lens element is AG2, the minimum air gap is formed on the at least one anti-reflective layer, a grain height of the nanostructure is gH, and the following conditions are satisfied:
65 nm<gH<600 nm;
0.001≤AG1/d<0.7; and
0.01<AG1/AG2<0.9.

### Claim 2 (depends on 1)

The imaging lens assembly of claim 1, wherein the at least one anti-reflective layer comprises a metal oxide layer.

### Claim 3 (depends on 2)

The imaging lens assembly of claim 2, wherein the minimum air gap between the off-axis region of the image-side surface of the first plastic lens element and the off-axis region of the object-side surface of the second plastic lens element is located between the optical effective region of the image-side surface of the first plastic lens element and the optical effective region of the object-side surface of the second plastic lens element.

### Claim 4 (depends on 1)

The imaging lens assembly of claim 1, wherein the peripheral air gap between the edge of the optical effective region of the image-side surface of the first plastic lens element and the edge of the optical effective region of the object-side surface of the second plastic lens element is AG2, the central distance between the paraxial region of the image-side surface of the first plastic lens element and the paraxial region of the object-side surface of the second plastic lens element is d, and the following condition is satisfied:
0.001<AG2/d<1.8.

### Claim 5 (depends on 1)

The imaging lens assembly of claim 1, wherein the minimum air gap between the off-axis region of the image-side surface of the first plastic lens element and the off-axis region of the object-side surface of the second plastic lens element is AG1, the peripheral air gap between the edge of the optical effective region of the image-side surface of the first plastic lens element and the edge of the optical effective region of the object-side surface of the second plastic lens element is AG2, and the following condition is satisfied:
0.01<AG1/AG2<0.64.

### Claim 6 (depends on 1)

The imaging lens assembly of claim 1, wherein the minimum air gap between the off-axis region of the image-side surface of the first plastic lens element and the off-axis region of the object-side surface of the second plastic lens element is AG1, and the following condition is satisfied:
0.001 mm<AG1<0.06 mm.

### Claim 7 (depends on 1)

The imaging lens assembly of claim 1, wherein the grain height of the nanostructure is gH, and the following condition is satisfied:
85 nm<gH<470 nm.

### Claim 8 (depends on 1)

The imaging lens assembly of claim 1, wherein a reflectance in a wavelength of 400 nm of the at least one anti-reflective layer is R400, a reflectance in a wavelength of 600 nm of the at least one anti-reflective layer is R600, a reflectance in a wavelength of 700 nm of the at least one anti-reflective layer is R700, and the following conditions are satisfied:
0.0%<R400≤1.0%;
0.0%<R600≤1.0%; and
0.0%<R700≤1.0%.

### Claim 9 (depends on 8)

The imaging lens assembly of claim 8, wherein the reflectance of the at least one anti-reflective layer at 700 nm is R700, and the following condition is satisfied:
0.0%<R700<0.6%.

### Claim 10 (depends on 1)

The imaging lens assembly of claim 1, further comprising:
a first light blocking sheet, disposed between the first plastic lens element and the second plastic lens element, and having an opening;
wherein a diameter of the optical effective region of the image-side surface of the first plastic lens element is ID1, a diameter of the optical effective region of the object-side surface of the second plastic lens element is OD2, a diameter of the opening of the first light blocking sheet is SD1, and the following condition is satisfied:
ID1<SD1<OD2.

### Claim 11 (depends on 10)

The imaging lens assembly of claim 10, further comprising:
a second light blocking sheet, disposed between the first plastic lens element and the second plastic lens element, and having an opening;
wherein the diameter of the optical effective region of the image-side surface of the first plastic lens element is ID1, the diameter of the optical effective region of the object-side surface of the second plastic lens element is OD2, a diameter of the opening of the second light blocking sheet is SD2, and the following condition is satisfied:
SD2<ID1<OD2.

### Claim 12 (depends on 1)

An electronic device, comprising:
the imaging lens assembly of claim 1; and
an image sensor, corresponding to the imaging lens assembly.