MAGNETIC SHIELD SHEET

To provide a magnetic shield sheet that exerts an electromagnetic wave suppression effect even at high frequencies from MHz to GHz in order to prevent leakage electromagnetic fields from a component that generates electromagnetic waves such as a coil in an electronic circuit, wiring, or the like.SOL...

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Bibliographic Details
Main Authors OMORI MIKIO, IDE TOSHIHIDE
Format Patent
LanguageEnglish
Japanese
Published 13.09.2021
Subjects
BASIC ELECTRIC ELEMENTS
CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS
CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
GENERATION
INDUCTANCES
MAGNETS
MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
PRINTED CIRCUITS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SYSTEMS FOR STORING ELECTRIC ENERGY
TRANSFORMERS
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Summary:To provide a magnetic shield sheet that exerts an electromagnetic wave suppression effect even at high frequencies from MHz to GHz in order to prevent leakage electromagnetic fields from a component that generates electromagnetic waves such as a coil in an electronic circuit, wiring, or the like.SOLUTION: A magnetic shield sheet according to an embodiment of the present invention for reducing the electromagnetic field leaking from a solenoid coil in a wireless power transmission circuit has a flat plate shape having a surface that is close to at least one of two end faces that are substantially perpendicular to the length direction of the solenoid coil, or close to a side surface that is substantially parallel to the length direction of the solenoid coil, and faces the end face or side surface, and includes a magnetic material in which a real component μ' of the relative permeability (complex relative permeability μr=μ'-jμ") in a high frequency band over a range of one digit or more from 1 MHz to 30 GHz is 1 or more, and the imaginary component μ" is 0.2 or less.SELECTED DRAWING: Figure 1 【課題】電子回路内のコイル等の電磁波を発生する部品や配線等からの漏洩電磁場を防ぐため、ＭＨｚからＧＨｚの高周波においても電磁波の抑制効果を発揮する防磁シートを提供する。【解決手段】本発明一態様の無線電力伝送回路内のソレノイドコイルから漏洩する電磁場を低減するための防磁シートは、ソレノイドコイルの長さ方向に略垂直な２つの端面の少なくとも一方に近接し、またはソレノイドコイルの長さ方向に略平行な側面に近接し、当該端面または側面に対向する表面を有する平板形状を有し、１ＭＨｚ〜３０ＧＨｚのうち一桁以上の範囲に亘って高周波数帯域での比透磁率（複素比透磁率μｒ＝μ'−ｊμ"）の実数成分μ'が１以上であって虚数成分μ"が０．２以下である磁性材料を含む。【選択図】図１
Bibliography:Application Number: JP20200033584