# US 2017/0288314 A1 · Near-field electromagnetic wave absorbing film

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- Number: US 2017/0288314 A1
- Document ID: US20170288314A1
- Status: Published application
- Kind: A1
- Application number: 15/363,793
- Filed: 2016-11-29
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Inventors: Seiji KAGAWA
- Web page: https://patentgrep.com/patent/US20170288314A1

## CPC

- H01Q 17/007: {with means for controlling the absorption}
- H05K 9/0096: {for television displays, e.g. plasma display panel}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A near-field electromagnetic wave absorbing film comprising a plastic film, and a single- or multi-layer, thin metal film formed on its surface; the thin metal film having laser-beam-bored holes of 200 μm or less in diameter with intervals of 50 μm or less on the entire surface, and pluralities of openings as large as giving transmission viewability partially on the surface.

## Claims

### Claim 1

A near-field electromagnetic wave absorbing film comprising a plastic film, and a single- or multi-layer, thin metal film formed on one surface of said plastic film;
said thin metal film having laser-beam-bored holes of 200 μm or less in diameter with intervals of 50 μm or less on the entire surface, and pluralities of openings as large as giving transmission viewability partially on the surface.

### Claim 2 (depends on 1)

The near-field electromagnetic wave absorbing film according to claim 1, wherein said laser-beam-bored holes have diameters of 100 μm or less.

### Claim 3 (depends on 2)

The near-field electromagnetic wave absorbing film according to claim 2, wherein said laser-beam-bored holes have diameters of 20-100 μm.

### Claim 4 (depends on 1)

The near-field electromagnetic wave absorbing film according to claim 1, wherein said laser-beam-bored holes are arranged with intervals of 20 μm or less.

### Claim 5 (depends on 1)

The near-field electromagnetic wave absorbing film according to claim 1, wherein said openings formed in said thin metal film are arranged in at least two directions.

### Claim 6 (depends on 1)

The near-field electromagnetic wave absorbing film according to claim 1, wherein the area ratio of said openings is 15-60%.

### Claim 7 (depends on 1)

The near-field electromagnetic wave absorbing film according to claim 1, wherein the thickness of said thin metal film is 10-300 nm.

### Claim 8 (depends on 1)

The near-field electromagnetic wave absorbing film according to claim 1, wherein said thin metal film is made of at least one metal selected from the group consisting of aluminum, copper, silver, tin, nickel, cobalt, chromium and their alloys.