Device provided with electromagnetic interference suppression body

Patent metadata

Field	Value
Publication number	US-10130017-B2
Application number	US-201515535700-A
Country	US
Kind code	B2
Filing date	Aug 3, 2015
Priority date	Dec 17, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A device is provided with a potential noise radiating source capable of radiating potential noise, a potential noise receiving portion capable of receiving the potential noise and an electromagnetic interference suppression body. The electromagnetic interference suppression body is made by binding flaky soft magnetic metal powder with a binding component and has a sheet-like shape. The electromagnetic interference suppression body is formed with a plurality of slits. The electromagnetic interference suppression body is provided to straddle the potential noise radiating source and the potential noise receiving portion.

First claim

The invention claimed is:

1. A device comprising:
a potential noise radiating source which may radiate a potential noise;
a potential noise receiving portion which is not directly connected to the potential noise radiating source, wherein the potential noise receiving portion is in a position at which the potential noise receiving portion may receive the potential noise; and
an electromagnetic interference suppression body,
wherein:
the electromagnetic interference suppression body is made by binding flaky soft magnetic metal powder with a binding component and has a sheet-like shape;
the electromagnetic interference suppression body is formed with a plurality of slits; and
the electromagnetic interference suppression body is provided to straddle the potential noise radiating source and the potential noise receiving portion.

2. The device as recited in claim 1 , wherein the slits are formed so that an effective dielectric constant of the electromagnetic interference suppression body in an in-plane direction is at most 500.

3. The device as recited in claim 2 , wherein the effective dielectric constant of the electromagnetic interference suppression body in the in-plane direction is at most 100.

4. The device as recited in claim 1 , wherein a depth of each of the slits is at least 83% of a thickness of the electromagnetic interference suppression body.

5. The device as recited in claim 1 , wherein a width of each of the slits is at least 0.02 mm and at most 0.4 mm.

6. The device as recited in claim 5 , wherein the width of each of the slits is at least 0.05 mm.

7. The device as recited in claim 1 , wherein a ratio P/t of a pitch P of the slits to a thickness t of the electromagnetic interference suppression body is at least 1 and at most 80.

8. The device as recited in claim 7 , wherein the ratio P/t is at most 50.

9. The device as recited in claim 1 , wherein a dielectric constant of the slit is at least 1 and at most 20.

Assignees

• Tokin Corp

Inventors

• Kondo Koichi
• Oka Toshiaki
• Yoshida Shigeyoshi
• Ikeda Masashi

Classifications

• H05K1/0216

  Reduction of cross-talk, noise or electromagnetic interference (grounding H05K1/0215) · CPC title

• H05K2201/0715

  provided by an outer layer of PCB · CPC title

• H05K9/0083 Primary

  comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers (H05K9/0086 takes precedence) · CPC title

• H05K9/0086

  comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering · CPC title

• H05K2201/083

  Magnetic materials · CPC title