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JP2011181815A - Electromagnetic wave absorber - Google Patents

Electromagnetic wave absorber Download PDF

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Publication number
JP2011181815A
JP2011181815A JP2010046504A JP2010046504A JP2011181815A JP 2011181815 A JP2011181815 A JP 2011181815A JP 2010046504 A JP2010046504 A JP 2010046504A JP 2010046504 A JP2010046504 A JP 2010046504A JP 2011181815 A JP2011181815 A JP 2011181815A
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Prior art keywords
electromagnetic wave
wave absorber
magnetic layer
conductive layer
magnetic
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JP2010046504A
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Japanese (ja)
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Koji Muraoka
貢治 村岡
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Shuhou Co Ltd
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Shuhou Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic wave absorber that demonstrates a transmission suppression effect of predetermined electromagnetic waves while the sheet thickness is controlled. <P>SOLUTION: The electromagnetic wave absorber 10 includes a magnetic layer 1 formed in a sheet shape by densely mixing magnetic powder 1a into a binder 1b, and a conductive layer 2 formed by printing conductive ink. Accordingly, an incident electromagnetic wave 3a into the magnetic layer 1 is absorbed in the magnetic layer 1, and, even when a portion thereof is transmitted without being completely absorbed, the transmitted electromagnetic wave 3b is reflected in the conductive layer 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、電磁波吸収体、特に、板状の電磁波吸収体に関するものである。   The present invention relates to an electromagnetic wave absorber, and more particularly to a plate-like electromagnetic wave absorber.

従来、電子機器から放出される不要電磁波の低減や電子機器に生じる電磁障害の抑制のため、バインダーに磁性粉を分散させ、シート状の磁性層を形成して磁気シートが用いられていた。このとき、使用環境による厚みの変化を抑え、透磁率の低下を防止し、電気抵抗を向上するため、バインダーに絶縁性ゴム微粒子を含有させた磁気シートおよびその製造方法が開示されている(例えば、特許文献1参照)。   Conventionally, in order to reduce unnecessary electromagnetic waves emitted from an electronic device and to suppress electromagnetic interference generated in the electronic device, a magnetic sheet is used by dispersing a magnetic powder in a binder and forming a sheet-like magnetic layer. At this time, in order to suppress a change in thickness due to the use environment, prevent a decrease in magnetic permeability, and improve electric resistance, a magnetic sheet containing insulating fine rubber particles in a binder and a manufacturing method thereof are disclosed (for example, , See Patent Document 1).

特開2009−295671号公報(第4−6頁、図1)Japanese Patent Laying-Open No. 2009-295671 (page 4-6, FIG. 1)

しかしながら、特許文献1は、電磁波の透過抑制効果を高めようとすると、その厚さを増す必要があるため、シート厚さを抑えたままで、所定の電磁波の透過抑制効果を発揮する電磁波吸収体およびその製造方法が求められていた。   However, since Patent Document 1 needs to increase the thickness of the electromagnetic wave transmission suppressing effect when attempting to increase the electromagnetic wave transmission suppressing effect, the electromagnetic wave absorber that exhibits the predetermined electromagnetic wave transmission suppressing effect while suppressing the sheet thickness and There has been a demand for a production method thereof.

本発明は、上記要求に応えるものであって、シート厚さを抑えたままで、所定の電磁波の透過抑制効果を発揮する電磁波吸収体を提供することを目的とする。   An object of the present invention is to meet the above-described requirements and to provide an electromagnetic wave absorber that exhibits a predetermined electromagnetic wave transmission suppressing effect while suppressing the sheet thickness.

(1)本発明の電磁波吸収体は、磁性粉体がバインダーに密に混合され、シート状に形成された磁性層と、該磁性層の一方の面に形成された導電層と、を有することを特徴とする。
(2)また、前記導電層が印刷された導電性インクあるいは塗布された導電性ペーストであることを特徴とする。
(3)あるいは、前記導電層がメッキまたは蒸着された金属膜であることを特徴とする。
(4)さらに、前記バインダーが天然ゴム、人工ゴムあるいは合成樹脂の何れかであることを特徴とする。
(1) The electromagnetic wave absorber of the present invention has a magnetic layer in which magnetic powder is intimately mixed with a binder and formed in a sheet shape, and a conductive layer formed on one surface of the magnetic layer. It is characterized by.
(2) The conductive layer is a printed conductive ink or a coated conductive paste.
(3) Alternatively, the conductive layer is a metal film plated or deposited.
(4) Further, the binder is any of natural rubber, artificial rubber or synthetic resin.

本発明に係る電磁波吸収体は、磁性層の一方の面に形成された導電層を有するから、磁性層に入射した電磁波が磁性層において完全に吸収されないで、一部が透過した場合でも、該透過した電磁波が導電層において反射される。したがって、導電層の磁性層側でない方向への電磁波の漏れが最少に抑えられる。また、導電層において反射され、再度磁性層に入射した電磁波は、再度吸収され、磁性層の導電層側でない方向への電磁波の反射が最少に抑えられる。
したがって、所定の電磁波の透過抑制効果を得るために必要な磁性層の厚さを、薄くすることができる。
また、導電層が印刷された導電性インク等であるから、導電層自体も薄くすることができ、電磁波吸収体の全体厚さを薄くすることができる。
Since the electromagnetic wave absorber according to the present invention has a conductive layer formed on one surface of the magnetic layer, the electromagnetic wave incident on the magnetic layer is not completely absorbed by the magnetic layer, and even when a part of the electromagnetic wave is transmitted, The transmitted electromagnetic wave is reflected on the conductive layer. Therefore, leakage of electromagnetic waves in a direction not on the magnetic layer side of the conductive layer is minimized. Further, the electromagnetic wave reflected by the conductive layer and incident on the magnetic layer again is absorbed again, and reflection of the electromagnetic wave in a direction other than the conductive layer side of the magnetic layer is minimized.
Therefore, the thickness of the magnetic layer necessary for obtaining a predetermined electromagnetic wave transmission suppressing effect can be reduced.
Moreover, since it is the conductive ink etc. with which the conductive layer was printed, the conductive layer itself can also be made thin and the whole thickness of the electromagnetic wave absorber can be made thin.

本発明の実施の形態に係る電磁波吸収体を模式的に示す断面図。Sectional drawing which shows typically the electromagnetic wave absorber which concerns on embodiment of this invention.

図1は、本発明の実施の形態に係る電磁波吸収体を模式的に示す断面図である。
図1において、電磁波吸収体10は、シート状の磁性層1と、磁性層1に印刷された導電層2と、を有している。
磁性層1は磁性粉体1aがバインダー1bに密に混合され、シート状に形成されたものである。また、導電層2は導電性インクが印刷されたものである。
したがって、磁性層1に入射した電磁波3aは磁性層1において吸収される。また、
完全に吸収されないで、一部が透過した場合でも、透過した電磁波3bが導電層2において反射されるから、導電層2の磁性層1側でない方向(図中、上方向)への電磁波3bの漏れが最少に抑えられる。さらに、導電層2において反射され、再度磁性層に入射した電磁波3cは、再度吸収され、磁性層の導電層側でない方向(図中、下方向)への電磁波の反射が最少に抑えられる。
したがって、所定の電磁波の透過抑制効果を得るために必要な磁性層の厚さを、薄くすることができる。また、導電層2が導電性インクを印刷したものであるから、導電層2自体も薄くすることができ、電磁波吸収体10全体の厚さを薄くすることができる。
FIG. 1 is a cross-sectional view schematically showing an electromagnetic wave absorber according to an embodiment of the present invention.
In FIG. 1, an electromagnetic wave absorber 10 includes a sheet-like magnetic layer 1 and a conductive layer 2 printed on the magnetic layer 1.
The magnetic layer 1 is a sheet formed by intimately mixing magnetic powder 1a with a binder 1b. The conductive layer 2 is printed with conductive ink.
Therefore, the electromagnetic wave 3 a incident on the magnetic layer 1 is absorbed by the magnetic layer 1. Also,
Even if a part of the electromagnetic wave 3b is not completely absorbed, the transmitted electromagnetic wave 3b is reflected by the conductive layer 2, so that the electromagnetic wave 3b in a direction (upward in the figure) of the conductive layer 2 is not on the magnetic layer 1 side. Leakage is minimized. Further, the electromagnetic wave 3c reflected on the conductive layer 2 and incident on the magnetic layer again is absorbed again, and reflection of the electromagnetic wave in a direction (downward in the drawing) of the magnetic layer is minimized.
Therefore, the thickness of the magnetic layer necessary for obtaining a predetermined electromagnetic wave transmission suppressing effect can be reduced. Moreover, since the conductive layer 2 is obtained by printing conductive ink, the conductive layer 2 itself can also be thinned, and the thickness of the entire electromagnetic wave absorber 10 can be thinned.

なお、本発明は、磁性粉体1aやバインダー1bの化学成分や形態(粒径等)を限定するものではない。例えば、磁性粉体1aは一定方向に並べたものであっても、ランダムに配置したものであってもよい。また、バインダー1bは、天然ゴム、人工ゴム、合成樹脂等、何れであってもよい。
なお、印刷方法および導電性インクについても限定するものではない。さらに、印刷に代えて、導電性ペーストを塗布したり、金属膜をメッキや蒸着によって形成したりしてもよい。
なお、以上は、磁性層1が平面状のシートであるものを図示しているが、本発明はこれに限定するものではなく、曲面状であったり、厚さが不均一であったりしてもよい。
Note that the present invention does not limit the chemical components and the form (particle size, etc.) of the magnetic powder 1a and the binder 1b. For example, the magnetic powder 1a may be arranged in a certain direction or randomly arranged. The binder 1b may be any of natural rubber, artificial rubber, synthetic resin, and the like.
The printing method and the conductive ink are not limited. Furthermore, instead of printing, a conductive paste may be applied, or a metal film may be formed by plating or vapor deposition.
Although the above shows that the magnetic layer 1 is a planar sheet, the present invention is not limited to this, and may have a curved surface shape or a non-uniform thickness. Also good.

よって、所望の電磁波吸収性能を有する電磁波吸収体の厚さを薄くすることができる。また、導電層を安価に設けることができるから、電磁波吸収体を安価に提供することができる。   Therefore, the thickness of the electromagnetic wave absorber having desired electromagnetic wave absorption performance can be reduced. In addition, since the conductive layer can be provided at low cost, the electromagnetic wave absorber can be provided at low cost.

本発明に係る電磁波吸収体を設置することができる電子機器は限定されるものではないから、周囲への電磁波の伝播を抑えたり、周囲からの電磁波の影響を避けたい各種電子機器に広く設置することができる。   Since the electronic device that can install the electromagnetic wave absorber according to the present invention is not limited, it is widely installed in various electronic devices that want to suppress the propagation of electromagnetic waves to the surroundings or avoid the influence of electromagnetic waves from the surroundings. be able to.

1 磁性層
1a 磁性粉体
1b バインダー
2 導電層
3a 電磁波
3b 電磁波
3c 電磁波
10 電磁波吸収体
DESCRIPTION OF SYMBOLS 1 Magnetic layer 1a Magnetic powder 1b Binder 2 Conductive layer 3a Electromagnetic wave 3b Electromagnetic wave 3c Electromagnetic wave 10 Electromagnetic wave absorber

Claims (4)

磁性粉体がバインダーに密に混合され、シート状に形成された磁性層と、
該磁性層の一方の面に形成された導電層と、
を有することを特徴とする電磁波吸収体。
A magnetic layer in which magnetic powder is intimately mixed with a binder and formed into a sheet;
A conductive layer formed on one surface of the magnetic layer;
Electromagnetic wave absorber characterized by having.
前記導電層が印刷された導電性インクあるいは塗布された導電性ペーストであることを特徴とする請求項1記載の電磁波吸収体。   The electromagnetic wave absorber according to claim 1, wherein the conductive layer is a printed conductive ink or a coated conductive paste. 前記導電層がメッキまたは蒸着された金属膜であることを特徴とする請求項1記載の電磁波吸収体。   2. The electromagnetic wave absorber according to claim 1, wherein the conductive layer is a metal film plated or vapor-deposited. 前記バインダーが天然ゴム、人工ゴムあるいは合成樹脂の何れかであることを特徴とする請求項1記載の電磁波吸収体。   The electromagnetic wave absorber according to claim 1, wherein the binder is any one of natural rubber, artificial rubber, and synthetic resin.
JP2010046504A 2010-03-03 2010-03-03 Electromagnetic wave absorber Pending JP2011181815A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104853578A (en) * 2015-05-16 2015-08-19 常德鑫鸿金属材料有限公司 Electromagnetic shielding-used conductive foam sponge and preparation method thereof
CN105304978A (en) * 2015-11-13 2016-02-03 中国人民解放军空军工程大学 Low-pass and high-absorption electromagnetic functional layer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10163669A (en) * 1996-12-02 1998-06-19 Mitsubishi Electric Corp Shield member
JP2002118008A (en) * 2000-10-10 2002-04-19 Daido Steel Co Ltd Electromagnetic wave absorber for millimeter
JP2008021990A (en) * 2006-06-16 2008-01-31 Nitta Ind Corp Electromagnetic interference suppressor and method of suppressing electromagnetic fault
JP2008270267A (en) * 2007-04-16 2008-11-06 Nippon Shizai Kk Electromagnetic wave control film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10163669A (en) * 1996-12-02 1998-06-19 Mitsubishi Electric Corp Shield member
JP2002118008A (en) * 2000-10-10 2002-04-19 Daido Steel Co Ltd Electromagnetic wave absorber for millimeter
JP2008021990A (en) * 2006-06-16 2008-01-31 Nitta Ind Corp Electromagnetic interference suppressor and method of suppressing electromagnetic fault
JP2008270267A (en) * 2007-04-16 2008-11-06 Nippon Shizai Kk Electromagnetic wave control film

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104853578A (en) * 2015-05-16 2015-08-19 常德鑫鸿金属材料有限公司 Electromagnetic shielding-used conductive foam sponge and preparation method thereof
CN105304978A (en) * 2015-11-13 2016-02-03 中国人民解放军空军工程大学 Low-pass and high-absorption electromagnetic functional layer
CN105304978B (en) * 2015-11-13 2018-12-11 中国人民解放军空军工程大学 A kind of low pass height suction type electromagnetic work ergosphere

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