# US 11,440,290 B2 · Waterproof sound-transmitting sheet for facilitating vision inspection

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- Number: US 11,440,290 B2
- Document ID: US11440290B2
- Status: Granted
- Kind: B2
- Application number: 17/295,825
- Filed: 2019-11-22
- Published: 2022-03-24
- Granted: 2022-09-13
- Earliest claimed: 2018-11-22
- Assignees: Amogreentech Co., Ltd.
- Applicants: Amogreentech Co., Ltd.
- Inventors: Inyong Seo
- Web page: https://patentgrep.com/patent/US11440290B2

## CPC

- B32B 7/023: Optical properties
- H04R 1/023: {Screens for loudspeakers}
- B32B 5/02: characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)}
- B32B 5/022: {Non-woven fabric}
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 5/267: {characterised by at least one non-woven fabric layer that is a spunbonded fabric}
- D01F 1/04: Pigments
- D04H 1/728: by electro-spinning {(electro-spinning methods and apparatus D01D5/0007)}
- H04R 1/086: {Protective screens, e.g. all weather or wind screens}
- B32B 2250/03: 3 layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2255/02: on fibrous or filamentary layer
- B32B 2262/0238: Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
- B32B 2262/0292: Polyurethane fibres
- B32B 2305/026: Porous
- B32B 2307/10: having particular acoustical properties
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2307/7265: Non-permeable
- B32B 2457/00: Electrical equipment
- D01D 5/0007: {Electro-spinning (non-woven fabrics produced by electro-spinning D04H1/728)}
- H04R 31/003: {for diaphragms or their outer suspension}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS

## Abstract

Disclosed is a waterproof sound-transmitting sheet for facilitating a visual inspection, which radiates a polymer material in a state of blending a pigment to form a waterproof layer having an achromatic color, thereby facilitating a vision inspection, and improving a water repellence even while making the waterproof sound-transmitting sheet thin and light. The disclosed waterproof sound-transmitting sheet for facilitating the visual inspection includes an acoustic layer interposed between an upper waterproof layer and a lower waterproof layer, and at least one of the upper waterproof layer and the lower waterproof layer is composed of a porous colored membrane having a color.

## Claims

### Claim 1

A waterproof sound-transmitting sheet for facilitating a vision inspection comprising:
an upper waterproof layer composed of a porous membrane;
a lower waterproof layer composed of the porous membrane and disposed under the upper waterproof layer; and
an acoustic layer composed of the porous membrane and interposed between the upper waterproof layer and the lower waterproof layer,
wherein the porous membrane of at least one of the upper waterproof layer and the lower waterproof layer is a porous colored membrane having a color other than white and black, and
wherein the upper waterproof layer and the lower waterproof layer include a fiber structure in a straight shape, whereas the porous membrane of the acoustic layer includes a fiber structure in a spring shape with more curves than those of the upper waterproof layer and the lower waterproof layer.

### Claim 2 (depends on 1)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 1,
wherein the porous colored membrane has an achromatic color other than white and black.

### Claim 3 (depends on 1)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 1,
wherein the porous colored membrane is gray.

### Claim 4 (depends on 1)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 1,
wherein the porous colored membrane is formed by electrospinning a mixture of a pigment and a polymer material, and a color of the pigment is one of black and white.

### Claim 5 (depends on 4)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 4,
wherein a rate of adding the pigment is 0.5 wt % or more and 5 wt % or less based on the mixture.

### Claim 6 (depends on 4)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 4,
wherein the polymer material is one of polyvinylidenefluoride (PVDF) and polyurethane (PU), and a color of the polymer material is white.

### Claim 7 (depends on 1)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 1,
wherein the porous colored membrane has a coating material coated on a surface of a fiber.

### Claim 8 (depends on 1)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 1,
wherein the porous membrane of the acoustic layer is a porous colored membrane of a color formed by electrospinning a polymer material mixed with a colored pigment.

### Claim 9 (depends on 1)

The waterproof sound-transmitting sheet for facilitating the vision inspection of claim 1,
wherein the porous membrane of the acoustic layer is a porous colored membrane of an achromatic color formed by electrospinning a polymer material mixed with a black pigment.