JP2012023261A - Magnetic substance sheet and magnetic substance core using the same - Google Patents

Magnetic substance sheet and magnetic substance core using the same Download PDF

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JP2012023261A
JP2012023261A JP2010161330A JP2010161330A JP2012023261A JP 2012023261 A JP2012023261 A JP 2012023261A JP 2010161330 A JP2010161330 A JP 2010161330A JP 2010161330 A JP2010161330 A JP 2010161330A JP 2012023261 A JP2012023261 A JP 2012023261A
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magnetic
iron
resin
alloy
magnetic substance
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Yoshiaki Ishii
善明 石井
Takahiro Ogawa
高浩 小川
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Toko Inc
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Toko Inc
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PROBLEM TO BE SOLVED: To provide a magnetic substance sheet capable of solving a problem that a conventional magnetic substance sheet cannot be used for electronic equipment used at a place including within electronic equipment where temperature easily becomes high because, at a high temperature of 105°C or higher, thermal expansion stress of magnetic substance powder concentrates in the thickness direction of the magnetic substance sheet, the magnetic substance sheet expands in the thickness direction and stress of the thermal expansion is added so as to expand intervals between the magnetic substance sheets, resulting in a degradation of core strength and real part permeability, because a flat surface of a flat or needle-like soft magnetic material powder is so oriented as to be arranged in the direction perpendicular to the thickness direction of a magnetic substance sheet.SOLUTION: A magnetic substance sheet is formed by using spherical magnetic substance powder and insulation magnetic substance having organic binder. The magnetic substance sheet prevents degradation in properties including real part permeability even if it is used at a place where temperature easily becomes high.

Description

本発明は、磁性体粉と有機結合剤を有する磁性体によって形成された磁性体シート及び、この磁性体シートを複数枚積層して形成された磁性体コアに関するものである。   The present invention relates to a magnetic sheet formed of a magnetic body having magnetic powder and an organic binder, and a magnetic core formed by laminating a plurality of the magnetic sheets.

近年、通信端末の小型化、多用途化が進み、低中波帯の電波を利用した小型の端末が多く見られる。この様な低中波帯の送信及び受信に使用するコイルアンテナとして、図９に示す様に、偏平状又は針状の軟磁性体粉と有機結合剤を有する磁性体によって形成された磁性体シートを複数枚積層してコア９１を形成し、このコア９１に巻線９２を巻回して形成したものがある（例えば、特許文献１を参照。）。   In recent years, communication terminals have become smaller and more versatile, and there are many small terminals using low-medium-band radio waves. As a coil antenna used for transmission and reception in such a low and medium wave band, as shown in FIG. 9, a magnetic sheet formed of a magnetic material having a flat or needle-shaped soft magnetic powder and an organic binder. A core 91 is formed by laminating a plurality of layers, and a winding 92 is wound around the core 91 (see, for example, Patent Document 1).

特開2005-317674号公報JP 2005-317674 A

この様な従来のコイルアンテナは、偏平状又は針状の軟磁性体粉を用い、この軟磁性体粉の平らな面が磁性体シートの厚み方向と垂直な方向に配列する様に配向した磁性体シートを複数枚積層しているため、コアの実数部透磁率を高くすることができ、これによりコアの形状を小さくでき、コイルの出力も大きくできる。
一方、コイルアンテナは、設置スペースに余裕があり、形状が大きくても問題がなかったり、実数部透磁率が低くても問題がないものも多い。また、従来のコイルアンテナは、偏平状又は針状の軟磁性体粉の平らな面を磁性体シートの厚み方向と垂直な方向に配列する様に配向しているため、１０５℃以上の高温になると、磁性体粉の熱膨張応力が磁性体シートの厚み方向に集中して磁性体シートが厚み方向に膨張し、この熱膨張の応力が磁性体シート間を押し広げる形で加わって、コアの強度が劣化したり、実数部透磁率が低下したりするという問題があった。そのため、電子機器内の高温になり易い場所や、高温になり易い場所で用いられる電子機器に使用できなかった。 Such a conventional coil antenna uses flat or needle-shaped soft magnetic powder, and the magnetic surface is oriented so that the flat surface of the soft magnetic powder is arranged in a direction perpendicular to the thickness direction of the magnetic sheet. Since a plurality of body sheets are laminated, the real part permeability of the core can be increased, thereby reducing the shape of the core and increasing the output of the coil.
On the other hand, many coil antennas have a sufficient installation space, and there is no problem even if the shape is large. In addition, since the conventional coil antenna is oriented so that the flat surface of the flat or needle-like soft magnetic powder is arranged in a direction perpendicular to the thickness direction of the magnetic sheet, the coil antenna is heated to a high temperature of 105 ° C. or higher. In this case, the thermal expansion stress of the magnetic powder concentrates in the thickness direction of the magnetic sheet, and the magnetic sheet expands in the thickness direction. There was a problem that the strength deteriorated or the real part permeability decreased. Therefore, it could not be used for an electronic device used in a place where the temperature in the electronic device is likely to be high or a location where the temperature is likely to be high.

本発明の磁性体シート及びこの磁性体シートを用いた磁性体コアは、高温になる場所で使用しても実数部透磁率等の特性が劣化したり、コアの強度が劣化したりするのを防止できる磁性体シート及びこの磁性体シートを用いた磁性体コアを提供することを目的とする。   The magnetic material sheet of the present invention and the magnetic material core using this magnetic material sheet may deteriorate characteristics such as the permeability of the real part or the strength of the core even when used in a place where the temperature is high. It is an object of the present invention to provide a magnetic sheet that can be prevented and a magnetic core using the magnetic sheet.

本発明の磁性体シートは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成される。
また、本発明の磁性体コアは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成された厚さが１０μｍ〜１ｍｍの磁性体シートを複数枚積層して形成される。
さらに、本発明の磁性体コアは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成された厚さが１０μｍ〜１ｍｍの磁性体シートを複数枚積層し、可撓性を持たせる。 The magnetic sheet of the present invention is formed using an insulating magnetic material having a spherical magnetic powder and an organic binder.
The magnetic core of the present invention is formed by laminating a plurality of magnetic sheets having a thickness of 10 μm to 1 mm formed using an insulating magnetic material having a spherical magnetic powder and an organic binder. .
Furthermore, the magnetic core of the present invention is formed by laminating a plurality of magnetic sheets having a thickness of 10 μm to 1 mm formed using an insulating magnetic material having a spherical magnetic powder and an organic binder. To have.

本発明の磁性体シートは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成されるので、高温になり易い場所で使用しても実数部透磁率等の特性が劣化するのを防止できる。
また、本発明の磁性体コアは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成された厚さが１０μｍ〜１ｍｍの磁性体シートを複数枚積層して形成されるので、磁性体シートが厚み方向に膨張することがなく、高温になり易い場所で使用しても実数部透磁率等の特性が劣化するのを防止でき、かつ、コアの強度が劣化するのを防止できる。
さらに、本発明の磁性体コアは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成された厚さが１０μｍ〜１ｍｍの磁性体シートを複数枚積層し、可撓性を持たせるので、磁性体シートが厚み方向に膨張することがなく、高温になり易い場所で使用しても実数部透磁率等の特性が劣化するのを防止でき、かつ、コアの強度が劣化するのを防止できる。 Since the magnetic sheet of the present invention is formed by using an insulating magnetic material having a spherical magnetic powder and an organic binder, characteristics such as real part permeability deteriorate even when used in a place where the temperature tends to be high. Can be prevented.
The magnetic core of the present invention is formed by laminating a plurality of magnetic sheets having a thickness of 10 μm to 1 mm formed using an insulating magnetic material having a spherical magnetic powder and an organic binder. Therefore, the magnetic sheet does not expand in the thickness direction, and even when used in a place where the temperature tends to be high, it is possible to prevent deterioration of characteristics such as the real part permeability, and the strength of the core is also deteriorated. Can be prevented.
Furthermore, the magnetic core of the present invention is formed by laminating a plurality of magnetic sheets having a thickness of 10 μm to 1 mm formed using an insulating magnetic material having a spherical magnetic powder and an organic binder. Therefore, the magnetic sheet does not expand in the thickness direction, and it can be prevented from deteriorating characteristics such as the permeability of the real part even when used in a place where the temperature tends to be high, and the core strength is deteriorated. Can be prevented.

本発明の磁性体シートを用いた磁性体コアの実施例を示す分解斜視図である。It is a disassembled perspective view which shows the Example of the magnetic body core using the magnetic material sheet of this invention. 本発明の磁性体シートを用いた磁性体コアの実施例を示す斜視図である。It is a perspective view which shows the Example of the magnetic body core using the magnetic material sheet of this invention. 本発明の磁性体シートを用いた磁性体コアの製造工程を示す斜視図である。It is a perspective view which shows the manufacturing process of the magnetic body core using the magnetic material sheet of this invention. 本発明の磁性体コアを用いたコイルアンテナの斜視図である。It is a perspective view of the coil antenna using the magnetic body core of this invention. 本発明の磁性体シートを高温高湿中に放置した時の厚み方向の膨張特性を示すグラフである。It is a graph which shows the expansion characteristic of the thickness direction when the magnetic material sheet of this invention is left to stand in high temperature and high humidity. 本発明の磁性体シートを用いた磁性体コアの強度特性を示すグラフである。It is a graph which shows the intensity | strength characteristic of the magnetic body core using the magnetic body sheet | seat of this invention. 本発明の磁性体シートを用いた磁性体コアの別の実施例を示す斜視図である。It is a perspective view which shows another Example of the magnetic body core using the magnetic material sheet of this invention. 本発明の磁性体コアを用いた無接点充電装置を示す斜視図である。It is a perspective view which shows the non-contact charging device using the magnetic body core of this invention. 従来のコイルアンテナを示す斜視図である。It is a perspective view which shows the conventional coil antenna.

本発明の磁性体シートは、鉄アルミ珪素合金、鉄ニッケル、鉄コバルト合金、鉄コバルトシリコン合金、鉄シリコンバナジューム合金、鉄コバルトボロン合金、鉄クロムシリコン合金、コバルト系アモルファス合金、鉄系アモルファス合金、酸化物磁性粉、カーボニル鉄、モリブデンパーマロイ、純鉄圧粉の磁性材料のうち少なくとも１種類以上を含有する球状の磁性体粉と、ポリエステル系樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ニトリル−ブタン系ゴム、スチレン−ブタジエン系ゴム等の熱可塑性樹脂あるいはそれらの共重合体、エポキシ樹脂、フェノール樹脂、アミド系樹脂、イミド系樹脂等の熱硬化性樹脂、あるいは有機系難燃剤であるハロゲン化物、臭素化ポリマーのうち少なくとも１種類以上を含有する有機結合剤を混合した絶縁性磁性体を用いてシート状に形成される。この磁性体シートは、厚みが１０μｍ〜１ｍｍになる様に形成され、複数枚積み重ねられて磁性体コアが形成される。この時、この磁性体コアは、可撓性を有する様に、球状の磁性体粉と有機結合剤の材質及び比率が選択される。
従って、本発明の磁性体シートは、球状の磁性体粉を用いているため、有機結合剤中における各磁性体粉の位置変動や、磁性体粉の形状の変形の自由度が大きく、高温になっても、磁性体粉の熱膨張の応力が磁性体シートの全方向に分散され、発生する歪の大きさも小さく常温に戻るとその歪が解消される。また、本発明の磁性体コアは、高温になっても、その熱膨張の影響を小さくできるので、コアの強度が劣化したり、実数部透磁率が低下したりすることもない。 The magnetic sheet of the present invention includes iron aluminum silicon alloy, iron nickel, iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, iron chromium silicon alloy, cobalt amorphous alloy, iron amorphous alloy, Spherical magnetic powder containing at least one of magnetic materials such as oxide magnetic powder, carbonyl iron, molybdenum permalloy, and pure iron compact, polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin Thermoplastic resins such as cellulose resins, nitrile-butane rubbers, styrene-butadiene rubbers or copolymers thereof, epoxy resins, phenol resins, amide resins, imide resins, or organic Halogens and brominated polymers that are flame retardants It is formed into a sheet using an insulating magnetic material obtained by mixing an organic binder containing at least one or more. This magnetic sheet is formed to have a thickness of 10 μm to 1 mm, and a plurality of sheets are stacked to form a magnetic core. At this time, the material and ratio of the spherical magnetic powder and the organic binder are selected so that the magnetic core has flexibility.
Accordingly, since the magnetic sheet of the present invention uses spherical magnetic powder, the degree of freedom of positional variation of each magnetic powder in the organic binder and deformation of the shape of the magnetic powder is large, and the temperature is high. Even so, the thermal expansion stress of the magnetic powder is dispersed in all directions of the magnetic sheet, and the generated distortion is small, and the distortion is eliminated when the temperature returns to room temperature. In addition, since the magnetic core of the present invention can reduce the influence of thermal expansion even at high temperatures, the strength of the core does not deteriorate and the real part permeability does not decrease.

以下、本発明の磁性体シート及びこの磁性体シートを用いた磁性体コアの実施例を図１乃至図８を参照して説明する。
図１は本発明の磁性体シートを用いた磁性体コアの実施例を示す分解斜視図、図２は本発明の磁性体シートを用いた磁性体コアの実施例を示す斜視図である。
磁性体シート１１Ａ〜１１Ｅは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて、それぞれ厚みが１０μｍ〜１ｍｍになる様に形成される。球状の磁性体粉としては、例えば鉄とクロムとシリコンを含有した鉄クロムシリコン合金が用いられる。また、有機結合剤としては、例えばポリウレタン樹脂、硬化剤及び、難燃剤を組み合わせたものが用いられる。この有機結合剤は、鉄クロムシリコン合金に対して、ポリウレタン樹脂が８〜１２重量部、硬化剤が０．５〜２重量部及び、難燃剤が１〜１０重量部添加される。
この磁性体シート１１Ａ〜１１Ｅは、所定の厚みになる様に複数枚積み重ねられ、圧着されて、図２に示す様な磁性体コア１１が形成される。 Embodiments of the magnetic sheet of the present invention and a magnetic core using the magnetic sheet will be described below with reference to FIGS.
FIG. 1 is an exploded perspective view showing an embodiment of a magnetic core using the magnetic sheet of the present invention, and FIG. 2 is a perspective view showing an embodiment of the magnetic core using the magnetic sheet of the present invention.
The magnetic sheets 11A to 11E are formed so as to have a thickness of 10 μm to 1 mm, respectively, using an insulating magnetic material having a spherical magnetic powder and an organic binder. As the spherical magnetic powder, for example, an iron-chromium-silicon alloy containing iron, chromium, and silicon is used. Moreover, as an organic binder, what combined the polyurethane resin, the hardening | curing agent, and the flame retardant is used, for example. The organic binder is added with 8 to 12 parts by weight of a polyurethane resin, 0.5 to 2 parts by weight of a curing agent, and 1 to 10 parts by weight of a flame retardant with respect to the iron chromium silicon alloy.
A plurality of the magnetic sheets 11A to 11E are stacked so as to have a predetermined thickness and are pressed to form a magnetic core 11 as shown in FIG.

この様な磁性体コアは次の様にして製造される。まず、鉄クロムシリコン合金にポリウレタン樹脂８〜１２重量部、硬化剤０．５〜２重量部及び、難燃剤１〜１０重量部を添加し、さらに溶媒を添加して攪拌機で混合分散し、脱泡後、ドクターブレード法等で支持フィルム上に塗布することにより、図３（Ａ）に示す様な、厚みが１０μｍ〜１ｍｍの磁性体シート２１Ａ〜２１Ｅがそれぞれ形成される。この複数の磁性体シート２１Ａ〜２１Ｅは所定の厚みになる様に複数枚積み重ねられ、これらに３０〜５０ＭＰｓの圧力を加えて圧着して、図３（Ｂ）に示す様な、磁性体シート積層体２１が形成される。この磁性体シート積層体２１は、刃型、プレス金型、カッターの様な刃物等を用いて、所定の大きさに点線の部分で切断されて、図２に示す様な磁性体コア１１が形成される。
この磁性体コアは、コイルアンテナとして用いられる場合、図４に示される様に、磁性体コア４１の外周に巻線４２が巻回される。 Such a magnetic core is manufactured as follows. First, 8-12 parts by weight of a polyurethane resin, 0.5-2 parts by weight of a curing agent, and 1-10 parts by weight of a flame retardant are added to an iron-chromium silicon alloy, a solvent is further added, and the mixture is dispersed with a stirrer. After foaming, the magnetic material sheets 21A to 21E having a thickness of 10 μm to 1 mm as shown in FIG. 3A are formed by coating on a support film by a doctor blade method or the like. A plurality of the magnetic sheets 21A to 21E are stacked so as to have a predetermined thickness, and a pressure of 30 to 50 MPs is applied to the magnetic sheets to be bonded to each other, and a magnetic sheet stack as shown in FIG. A body 21 is formed. This magnetic sheet laminate 21 is cut into a predetermined size at a dotted line using a blade, a press die, a cutter such as a cutter, etc., and a magnetic core 11 as shown in FIG. 2 is formed. It is formed.
When this magnetic core is used as a coil antenna, a winding 42 is wound around the outer periphery of the magnetic core 41 as shown in FIG.

この様に形成された本発明の磁性体シートは、鉄アルミ珪素合金からなる球状の磁性体粉を用いて１ｍｍの厚さにしたものと、鉄クロムシリコン合金からなる球状の磁性体粉を用いて１．２ｍｍの厚さにしたものを１２５℃中に９４時間放置したところ、磁性体シートの厚み方向の膨張率はそれぞれ０％、０．６７％となった。これは、鉄アルミ珪素合金からなる偏平状の磁性体粉を用いて１ｍｍの厚さにした従来の磁性体シートの厚み方向の膨張率が７．１２％、それ以外の材質の偏平状磁性体粉を用いて厚さを０．３ｍｍ、０．５ｍｍ、１ｍｍ、３ｍｍにした従来の磁性体シートの厚み方向の膨張率がそれぞれ３．１５％、１６．９８％、２８．５４％、３０．３８％であるので、本発明の磁性体シートの高温における熱膨張率は従来の磁性体シートの高温における熱膨張率に比較して大幅に小さくなっている。
また、球状の磁性体粉を用いた本発明の磁性体シートと、偏平状の磁性体粉を用い磁性体シートの厚みをそれぞれ０．３ｍｍ、０．５ｍｍ、１ｍｍにした従来の磁性体シートを温度が８５℃、湿度が８５％の大気中に５００時間以上放置したところ、図５に示す様に、本発明の磁性体シートの厚み方向の膨張率５１は、偏平状の磁性体粉を用い磁性体シートの厚みをそれぞれ０．３ｍｍにした従来の磁性体シートの厚み方向の膨張率５２、偏平状の磁性体粉を用い磁性体シートの厚みをそれぞれ０．５ｍｍにした従来の磁性体シートの厚み方向の膨張率５３、偏平状の磁性体粉を用い磁性体シートの厚みをそれぞれ１ｍｍにした従来の磁性体シートの厚み方向の熱膨張率５４のいずれのものものよりも小さくすることができた。
さらに、球状の磁性体粉を用いて厚みを１．５ｍｍにした磁性体シートを積み重ねて形成した本発明の磁性体コアと偏平状の磁性体粉を用いて厚みを１．５ｍｍにした磁性体シートを積み重ねて形成した従来の磁性体コアについてオートグラフによる屈曲試験をしたところ、図６に点線で示す様に従来の磁性体コアは１０００サイクル程度で層間剥離が発生して強度が劣化したのに対し、図６に実線で示す様に本発明の磁性体コアは３０００サイクル以上でも強度が劣化しなかった。 The magnetic sheet of the present invention formed in this way uses a spherical magnetic powder made of iron aluminum silicon alloy and is made 1 mm thick, and a spherical magnetic powder made of iron chrome silicon alloy. When the thickness of 1.2 mm was left at 125 ° C. for 94 hours, the expansion coefficient in the thickness direction of the magnetic sheet was 0% and 0.67%, respectively. This is because a flat magnetic material made of iron-aluminum-silicon alloy has a thickness of 1 mm using a flat magnetic material powder, and the expansion coefficient in the thickness direction is 7.12%. The expansion coefficient in the thickness direction of a conventional magnetic sheet having a thickness of 0.3 mm, 0.5 mm, 1 mm, and 3 mm using powder is 3.15%, 16.98%, 28.54%, and 30.30, respectively. Since it is 38%, the thermal expansion coefficient of the magnetic sheet of the present invention at a high temperature is significantly smaller than the thermal expansion coefficient of the conventional magnetic sheet at a high temperature.
Also, a magnetic sheet of the present invention using spherical magnetic powder and a conventional magnetic sheet using flat magnetic powder and having a thickness of 0.3 mm, 0.5 mm, and 1 mm, respectively. When left in an atmosphere having a temperature of 85 ° C. and a humidity of 85% for 500 hours or longer, as shown in FIG. 5, the expansion coefficient 51 in the thickness direction of the magnetic material sheet of the present invention is flat magnetic powder. Conventional magnetic sheet in which the thickness of the magnetic sheet is 0.3 mm, and the expansion coefficient 52 in the thickness direction of the conventional magnetic sheet is 0.3 mm, and the thickness of the magnetic sheet is 0.5 mm using flat magnetic powder. The thermal expansion coefficient 53 in the thickness direction and the thermal expansion coefficient 54 in the thickness direction of the conventional magnetic material sheet using flat magnetic powder and each magnetic material sheet having a thickness of 1 mm can be made smaller. did it.
Further, the magnetic body of the present invention formed by stacking magnetic sheets having a thickness of 1.5 mm using a spherical magnetic powder and a magnetic body having a thickness of 1.5 mm using a flat magnetic powder. When a conventional magnetic core formed by stacking sheets was subjected to a bending test by an autograph, the strength of the conventional magnetic core deteriorated as a result of delamination in about 1000 cycles as shown by the dotted line in FIG. On the other hand, as indicated by the solid line in FIG. 6, the strength of the magnetic core of the present invention did not deteriorate even after 3000 cycles.

図７は本発明の磁性体シートを用いた磁性体コアの別の実施例を示す斜視図である。
磁性体シートは、球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて、厚みが１０μｍ〜１ｍｍになる様に形成される。球状の磁性体粉としては、例えば鉄クロムシリコン合金が用いられる。また、有機結合剤としては、例えばポリウレタン樹脂、硬化剤及び、難燃剤を組み合わせたものが用いられる。この有機結合剤は、鉄クロムシリコン合金に対して、ポリウレタン樹脂が８〜１２重量部、硬化剤が０．５〜２重量部及び、難燃剤が１〜１０重量部添加される。
この磁性体シートは、所定の厚みになる様に複数枚積み重ねられ、圧着されて、図７に示す様な磁性体コア７１が形成される。
この様な磁性体コアは前述の実施例と同様に、まず、鉄クロムシリコン合金にポリウレタン樹脂８〜１２重量部、硬化剤０．５〜２重量部及び、難燃剤１〜１０重量部を添加し、さらに溶媒を添加して攪拌機で混合分散し、脱泡後、ドクターブレード法等で支持フィルム上に塗布することにより、厚みが１０μｍ〜１ｍｍの磁性体シートが形成される。この複数の磁性体シートは所定の厚みになる様に複数枚積み重ねられ、これらに３０〜５０ＭＰｓの圧力を加えて圧着して、磁性体シート積層体が形成される。この磁性体シート積層体は、刃型、プレス金型、カッターの様な刃物等を用いて、所定の大きさに切断されて形成される。
この磁性体コアは、無接点充電装置として用いられる場合、図８に示される様に、磁性体コア８１の表面に、巻線を巻回した空芯コイル８２が配置される。 FIG. 7 is a perspective view showing another embodiment of a magnetic core using the magnetic sheet of the present invention.
The magnetic sheet is formed so as to have a thickness of 10 μm to 1 mm using an insulating magnetic body having a spherical magnetic powder and an organic binder. As the spherical magnetic powder, for example, iron chrome silicon alloy is used. Moreover, as an organic binder, what combined the polyurethane resin, the hardening | curing agent, and the flame retardant is used, for example. The organic binder is added with 8 to 12 parts by weight of a polyurethane resin, 0.5 to 2 parts by weight of a curing agent, and 1 to 10 parts by weight of a flame retardant with respect to the iron chromium silicon alloy.
A plurality of the magnetic sheets are stacked so as to have a predetermined thickness, and are pressed to form a magnetic core 71 as shown in FIG.
In the same manner as in the previous embodiment, such a magnetic core is first added with 8-12 parts by weight of a polyurethane resin, 0.5-2 parts by weight of a curing agent, and 1-10 parts by weight of a flame retardant in an iron-chromium silicon alloy. Further, a solvent is added, mixed and dispersed with a stirrer, defoamed, and then applied onto a support film by a doctor blade method or the like, thereby forming a magnetic sheet having a thickness of 10 μm to 1 mm. A plurality of the magnetic sheets are stacked so as to have a predetermined thickness, and a pressure of 30 to 50 MPs is applied to the magnetic sheets and pressed to form a magnetic sheet laminate. The magnetic sheet laminate is formed by cutting into a predetermined size using a blade, a press die, a blade such as a cutter, or the like.
When this magnetic core is used as a non-contact charging device, an air-core coil 82 in which a winding is wound is disposed on the surface of the magnetic core 81 as shown in FIG.

以上、本発明の磁性体シート及びこの磁性体シートを用いた磁性体コアの実施例を述べたが、本発明はこれらの実施例に限定されるものではない。例えば、球状の磁性体粉としては、鉄アルミ珪素合金、鉄ニッケル、鉄コバルト合金、鉄コバルトシリコン合金、鉄シリコンバナジューム合金、鉄コバルトボロン合金、コバルト系アモルファス合金、鉄系アモルファス合金、酸化物磁性粉、カーボニル鉄、モリブデンパーマロイ、純鉄圧粉の磁性材料のうち少なくとも１種類以上を含有する磁性材料を用いてもよい。また、有機結合剤としては、ポリエステル系樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ニトリル−ブタン系ゴム、スチレン−ブタジエン系ゴム等の熱可塑性樹脂あるいはそれらの共重合体、エポキシ樹脂、フェノール樹脂、アミド系樹脂、イミド系樹脂等の熱硬化性樹脂、あるいは有機系難燃剤であるハロゲン化物、臭素化ポリマーのうち少なくとも１種類以上を含有するものを用いてもよい。   As mentioned above, although the Example of the magnetic body sheet of this invention and the magnetic body core using this magnetic body sheet was described, this invention is not limited to these Examples. For example, spherical magnetic powders include iron aluminum silicon alloy, iron nickel, iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, cobalt amorphous alloy, iron amorphous alloy, oxide magnetic You may use the magnetic material containing at least 1 or more types among the magnetic materials of powder | flour, a carbonyl iron, molybdenum permalloy, and a pure iron compact. Examples of the organic binder include polyester resins, polyvinyl chloride resins, polyvinyl butyral resins, polyurethane resins, cellulose resins, nitrile-butane rubbers, styrene-butadiene rubbers, A thermosetting resin such as a coalescence, epoxy resin, phenol resin, amide resin, imide resin, or the like, or a halide or brominated polymer that is an organic flame retardant may be used. .

１１Ａ〜１１Ｅ 磁性体シート
１１ 磁性体コア 11A to 11E Magnetic material sheet 11 Magnetic material core

Claims (7)

球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成されたことを特徴とする磁性体シート。   A magnetic material sheet formed using an insulating magnetic material having a spherical magnetic powder and an organic binder. 前記球状の磁性体粉は、鉄アルミ珪素合金、鉄ニッケル、鉄コバルト合金、鉄コバルトシリコン合金、鉄シリコンバナジューム合金、鉄コバルトボロン合金、鉄クロムシリコン合金、コバルト系アモルファス合金、鉄系アモルファス合金、酸化物磁性粉、カーボニル鉄、モリブデンパーマロイ、純鉄圧粉の磁性材料のうち少なくとも１種類以上を含有する請求項１に記載の磁性体シート。   The spherical magnetic powder is composed of iron aluminum silicon alloy, iron nickel, iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, iron chrome silicon alloy, cobalt amorphous alloy, iron amorphous alloy, 2. The magnetic sheet according to claim 1, comprising at least one of magnetic materials of oxide magnetic powder, carbonyl iron, molybdenum permalloy, and pure iron powder. 前記有機結合剤は、ポリエステル系樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ニトリル−ブタン系ゴム、スチレン−ブタジエン系ゴム等の熱可塑性樹脂あるいはそれらの共重合体、エポキシ樹脂、フェノール樹脂、アミド系樹脂、イミド系樹脂等の熱硬化性樹脂、あるいは有機系難燃剤であるハロゲン化物、臭素化ポリマーのうち少なくとも１種類以上を含有する請求項１に記載の磁性体シート。   The organic binder is a thermoplastic resin such as polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, nitrile-butane rubber, styrene-butadiene rubber, or a copolymer thereof. The magnetic body according to claim 1, comprising at least one of a thermosetting resin such as an epoxy resin, a phenol resin, an amide resin, and an imide resin, or a halide or brominated polymer that is an organic flame retardant. Sheet. 球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成された厚さが１０μｍ〜１ｍｍの磁性体シートを複数枚積層したことを特徴とする磁性体コア。   A magnetic core characterized in that a plurality of magnetic sheets having a thickness of 10 μm to 1 mm formed by using an insulating magnetic material having a spherical magnetic powder and an organic binder are laminated. 球状の磁性体粉と有機結合剤を有する絶縁性磁性体を用いて形成された厚さが１０μｍ〜１ｍｍの磁性体シートを複数枚積層し、可撓性を持たせたことを特徴とする磁性体コア。   A magnetic material characterized in that a plurality of magnetic sheets having a thickness of 10 μm to 1 mm formed by using an insulating magnetic material having a spherical magnetic powder and an organic binder are laminated to give flexibility. Body core. 前記球状の磁性体粉は、鉄アルミ珪素合金、鉄ニッケル、鉄コバルト合金、鉄コバルトシリコン合金、鉄シリコンバナジューム合金、鉄コバルトボロン合金、鉄クロムシリコン合金、コバルト系アモルファス合金、鉄系アモルファス合金、酸化物磁性粉、カーボニル鉄、モリブデンパーマロイ、純鉄圧粉の磁性材料のうち少なくとも１種類以上を含有する請求項４又は請求項５に記載の磁性体コア。   The spherical magnetic powder is composed of iron aluminum silicon alloy, iron nickel, iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, iron chrome silicon alloy, cobalt amorphous alloy, iron amorphous alloy, The magnetic core according to claim 4 or 5, comprising at least one kind of magnetic materials of oxide magnetic powder, carbonyl iron, molybdenum permalloy, and pure iron compact. 前記有機結合剤は、ポリエステル系樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ニトリル−ブタン系ゴム、スチレン−ブタジエン系ゴム等の熱可塑性樹脂あるいはそれらの共重合体、エポキシ樹脂、フェノール樹脂、アミド系樹脂、イミド系樹脂等の熱硬化性樹脂、あるいは有機系難燃剤であるハロゲン化物、臭素化ポリマーのうち少なくとも１種類以上を含有する請求項４又は請求項５に記載の磁性体コア。   The organic binder is a thermoplastic resin such as polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, nitrile-butane rubber, styrene-butadiene rubber, or a copolymer thereof. Claim 4 or Claim 5 containing at least one or more of thermosetting resins such as epoxy resins, phenolic resins, amide resins, imide resins, halides that are organic flame retardants, and brominated polymers. The magnetic core according to the description.
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