JP6715324B2 - 磁性シート、これを含むモジュールおよびこれを含む携帯用機器 - Google Patents
磁性シート、これを含むモジュールおよびこれを含む携帯用機器 Download PDFInfo
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- JP6715324B2 JP6715324B2 JP2018517506A JP2018517506A JP6715324B2 JP 6715324 B2 JP6715324 B2 JP 6715324B2 JP 2018517506 A JP2018517506 A JP 2018517506A JP 2018517506 A JP2018517506 A JP 2018517506A JP 6715324 B2 JP6715324 B2 JP 6715324B2
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Description
また、本発明は、本発明に係る磁性シートを通じて具現される磁場ユニットを通じて近距離通信用アンテナ、無線通信用アンテナなどのアンテナ特性を向上させることによって、データおよび/または電力信号の送受信効率および送受信距離が顕著に増加した近距離通信モジュールまたは無線電力伝送モジュールを提供することにさらに他の目的がある。
また、前記磁性層は単一層の厚さが1〜30μmであり得る。
また、前記金属軟磁性体は、Ni−Co系合金、Fe−Ni系合金、Fe−Cr系合金、Fe−Al系合金、Fe−Si系合金、Fe−Si−B系合金、Fe−Si−B−Cu−Nb系合金からなる群から選択された1種以上を含み、前記フェライトは、Mn−Zn系フェライト、Ni−Zn系フェライト、Ni−Co系フェライト、Mg−Zn系フェライト、Cu−Zn系フェライト、およびコバルト置換Y型またはZ型六方晶系フェライトからなる群から選択された1種以上を含むことができる。
また、前記磁性層は単一層の厚さが1〜30μmであり得る。
また、本発明は、無線電力伝送用アンテナを含むアンテナユニット;前記アンテナユニットの一面に配置されて無線電力伝送用アンテナ特性を向上させ、アンテナに向かって磁束を集束させる本発明に係る磁性シートを少なくとも一つ以上具備する磁場ユニットを含む無線電力伝送モジュールを提供する。
以下、本発明で使用された用語について説明する。
具体的には、前記磁性層110a、110a’、110a”は、磁性シートの可撓性を向上させるために磁性体を破砕した磁性体破片111で形成される。
[数学式1]
異形度=破片の外接円の直径(μm)/破片の内接円の直径(μm)
前記数学式1において、破片の外接円の直径とは、破片のある一面に存在するある二点の間の距離うち最も長い距離を意味(図4aのR1、図4bのR2)し、このときに該当する破片の二点を通る円が破片の外接円に該当する。また、破片の内接円の直径は、破片のある一面に存在する二辺以上と接する内接円のうち直径が最も大きい内接円の直径を意味(図4aのr1、図4bのr2)する。
前記非晶質合金はFe系またはCo系の非晶質合金を使用することができ、生産単価を考慮する時、Fe系非晶質合金を使用することが好ましい。Fe系非晶質合金は、例えば、Fe−Si−B系非晶質合金を使用することができ、この時、Feが70〜90at%、SiおよびBの和が10〜30at%であることが好ましい。Feをはじめとする金属の含有量が高いほど飽和磁束密度が高くなるが、Fe元素の含有量が過度に多い場合は非晶質の形成が難しいので、Feの含有量が70〜90at%であることが好ましい。また、SiおよびBの和が10〜30at%の範囲のとき、合金の非晶質形成能が最も優秀である。このような基本組成に腐食を防止するために、Cr、Coなどの耐腐食性元素を20at%以内に添加することもでき、他の特性を付与するように必要に応じて他の金属元素を少量含むこともできる。また、前記Fe−Si−B系合金は例えば、結晶化温度が508℃であり、キュリー温度(Tc)が399℃であるものを使用することができる。しかし、このような結晶化温度はSiおよびBの含有量や、3元合金成分の他に添加される他の金属元素およびその含有量により変動され得る。
前記薄膜コーティング層110bは、破砕されてそれぞれが分離され得る磁性体破片を、一つの層となり得るように磁性体破片のそれぞれを固定および支持させて磁性層をシート状に維持させると共に、磁性体破片に加えられる外力を緩衝させ、水分が浸透して磁性体が酸化することを防止する役割を担当する。
前記熱可塑性高分子化合物は、ポリエチレン、ポリプロピレン、ポリスチレン、ポリ塩化ビニル、ポリアクリロニトリル樹脂、アクリロニトリル−ブタジエン−スチレン(ABS)、スチレン−アクリロニトリル(SAN)、アクリル系樹脂、メタクリル系樹脂、ポリアミド、熱可塑性ポリエステル(Ex.ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート(PBT)等)、ポリカーボネート、ポリフェニレンサルファイド樹脂、ポリアミドイミド、ポリビニルブチラール、ポリビニルホルマール、ポリヒドロキシポリエーテル、ポリエーテル、ポリフタルアミド(polypthalamide)、フッ素系樹脂(Ex.ポリテトラフルオロエチレン(PTFE)およびポリクロロトリフルオロエチレン(PCTFE))、フェノキシ樹脂、ポリウレタン系樹脂、ニトリルブタジエン樹脂などを1種以上含むことができる。また、前記熱硬化性高分子化合物は、フェノール系樹脂(PE)、ユリア系樹脂(UF)、メラミン系樹脂(MF)、不飽和ポリエステル系樹脂(UP)およびエポキシ樹脂などを1種以上含むことができる。また、前記ゴム系化合物は、スチレン−ブタジエンゴム(SBR)、ポリブタジエンゴム(BR)、アクリロニトリル−ブタジエンゴム(NBR)、ポリイソブチレン(PIB)ゴム、アクリルゴム、フッ素ゴム、シリコンゴムおよびクロロプレンなどを1種以上含むことができる。
前記薄膜コーティング層110bを形成させる薄膜コーティング層形成組成物が硬化反応を通じて固化される場合、前述した高分子化合物を硬化させることができる硬化性成分をさらに含むことができ、場合によって溶媒、硬化促進剤をさらに含むことができる。
また、前記薄膜コーティング層形成組成物は、必要に応じてpH調整剤、イオン捕捉剤、粘度調整剤、揺変性付与剤、酸化防止剤、熱安定剤、光安定剤、紫外線吸収剤、着色剤、脱水剤、難燃剤、帯電防止剤、防黴剤、防腐剤、などの各種添加剤の1種類または2種類以上が添加されてもよい。
また、保護部材140は、薄膜コーティング層110b上に別途の接着部材なしに直接対面して付着されるかまたは別途の接着部材を介在させて接着されてもよい。ただし、磁性シートの薄型化のために接着部材を介在させることなく直接薄膜コーティング層110bに付着することが好ましい。
本発明の第1製造方法に係る磁性シートは、(1)磁性体シートの少なくとも一面に薄膜コーティング層を形成させる段階;および(2)薄膜コーティング層が形成された磁性体シートを破砕する段階;を含んで製造され得るが、まず、本発明の一実施例に係る(1)段階として、磁性体シートの少なくとも一面に薄膜コーティング層を形成させる段階を遂行する。
磁性体シートを直接製造する一例として、磁性体がNi−Zn−Cu−Co系フェライトシートである場合、該当フェライトの製造方法は次のとおりである。まず、酸化ニッケル、酸化亜鉛、酸化銅、酸化コバルトおよび二酸化三鉄を所定の組成比となるように混合して、原料混合物を収得する。この時、前記混合物は乾式混合や湿式混合を通じて混合され得、混合される原料の粒径は0.05〜5μmであることが好ましい。前記原料混合物に含まれる酸化ニッケル、酸化亜鉛などの成分は、それぞれの成分または前記成分を含有する複合酸化物の形態で原料に含まれ得、酸化コバルトの場合にもコバルトフェライト、四酸化三コバルトの形態で原料に含まれ得る。
薄膜コーティング層形成組成物に対する固化程度の選択は具体的な具現例によって変更され得るが、例えばそれぞれの磁性層の付着のために別途の接着剤層を使用せずに磁性層が複数個で備えられる磁性シートを製造する一方法として、薄膜コーティング層を接着剤層として代用するために、薄膜コーティング層を半固化状態に維持させることができる。すなわち、完全固化した薄膜コーティング層は作業性のために常温タッキーも殆どなく、接着性がないため完全固化した薄膜コーティング層を他の磁性層と付着させることは接着剤がなくては不可能であるが、組成によって半固化した薄膜コーティング層は他の磁性層との付着後に完全固化を通じて独立的に製造された2個の磁性層を別途の接着剤がなくても付着させることができる利点がある。ただし、後述する(2)段階である破砕工程で生成する磁性体破片が、半固化した薄膜コーティング層を破ったり損傷させない程度の機械的強度および屈曲特性を保有できる薄膜コーティング層形成組成物に限って、半固化タイプに具現されることが好ましい。
前記磁性体シートを破砕する方法は、公知とされた磁性体の破砕方法である場合、制限なく採用して使用することができる。その一例として、接着部材、磁性体シート、薄膜コーティング層および保護部材順に順次積層された積層体を破砕装置を通過させて磁性体シートを非定型の破片に粉砕させることができ、その後圧力を加えて磁性層の平坦化および薄膜コーティング層が磁性体破片をさらによく固定させることができる。ただし、前記のような積層体を、製造後破砕させずに保護部材がない状態で薄膜コーティング層のみを具備した状態で破砕することもでき、破砕の時に保護部材を具備させる場合でも紙のように接着層を具備していない臨時の保護部材を薄膜コーティング層が形成された磁性体シートに載せて破砕した後、前記臨時の保護部材を除去させることも可能である。
具体的には、図5aに図示されたように、凹凸11a、12aがある複数個の第1ローラー11、12と前記第1ローラー11、12とそれぞれ対応する第2ローラー21、22を具備する破砕装置に非晶質合金の磁性体が積層された積層体100’aを通過させて積層体100’aを破砕および加圧させた後、第3ローラー13および前記第3ローラー13に対応する第4ローラー23を通じて積層体100’bをさらに加圧させて磁性シート100’を製造することができる。この時、加圧の程度に応じて破砕された破片間離隔空間に薄膜コーティング層が浸透するように調節することができる。
具体的には、磁性シート100の保護部材140の上部および/または接着部材130の下部に電磁波遮蔽層、放熱層および/またはこれらが積層された複合層やこれらが一つの層になって機能が複合された複合層のような機能層が備えられ得る。一例として、熱伝導度および導電率に優れている銅、アルミニウムなどの金属ホイルが接着剤や両面テープを通じて保護部材140の上部に付着され得る。または、Cu、Ni、Ag、Al、Au、Sn、Zn、Mn、Mg、Cr、Tw、Tiまたはこれらの金属の組み合わせが保護部材140上にスパッタリング、真空蒸着、化学気相蒸着などの公知とされた方法で蒸着されて金属箔膜を形成することもできる。前記機能層が接着剤を通じて備えられる場合、前記接着剤は公知の接着剤であり得、これに対する非制限的な例として、アクリル系、ウレタン系、エポキシ系などの接着剤を使用することができる。一方、前記接着剤にも放熱性能を付与させて使用することができ、このために接着剤にニッケル、銀、炭素素材などの公知とされたフィラーを混合させることができ、前記フィラーの含有量は公知とされた放熱接着剤内のフィラーの含有量であり得るため、本発明ではこれを特に限定しない。
以上で説明した本発明の一実施例に係る磁性シート100、100’、100”、200は、所定の周波数において磁気的特性が異なる他の磁性シートと複合化されて、互いに異なる周波数帯域を使用するアンテナ特性をそれぞれ同時に向上させることができる複合磁場ユニットで具現されてもよく、この時、互いに異なる磁性シートの配置は積層構造であり得、ある一磁性シートが他の磁性シートの内部に差し込まれて配置され得るなど、本発明では具体的な配置関係に対しては限定しない。
また、前述した本発明の一実施例に係る磁性シート100、100’、100”、200は、少なくとも一つのシートを含む磁場ユニット1000であって、アンテナコアの少なくとも一面に付着して低周波アンテナとして具現され得るが、図8aに図示されたように、低周波アンテナは、アンテナコア1100、前記アンテナコア1100の両面にそれぞれ付着した磁場ユニット1000および前記アンテナコア1100および前記磁場ユニット1000の外側面に巻かれるコイル1400を含む。この時、前記アンテナコア1100は磁性体、例えばNi−Zn系フェライトであり得、形状的に長いバーの形状を有し得、フェライトの高い脆性のため、長いバーの形状のアンテナコアは容易にいくつかの塊りに分離され得、これに伴い、初期に設計された透磁率などの物性を満足させることができない可能性があるなどの問題がある。しかし、アンテナコアの少なくとも一面に付着する磁場ユニットは、アンテナコアの分離による物性の低下が発生しても磁場ユニットによる物性の補完を通じて、低周波アンテナとしての機能を持続的に発現できる利点があり、外力が加えられても磁場ユニットに備えられる磁性シートの可撓性、緩衝性が優秀であるため、磁性シートに備えられる磁性体破片にはそれ以上破片の微細欠片化が防止されて、磁場ユニットを通じてのアンテナコアの磁気的物性の補完は長期に渡って持続され得る。
ただし、下記の実施例は本発明の理解を助けるためのものに過ぎず、本発明は下記の実験例によって限定されるものではない。
メルトスピニングによる急冷凝固法(RSP)でFe91.6Si2B6Co0.2Ni0.2非晶質合金リボンを製造後、シート状にカッティングした厚さが24μmであるリボンシートを460℃、大気雰囲気で1時間無磁場熱処理して磁性体を具備するリボンシートを製造した。
実施例1と同一に実施して製造するものの、前記薄膜コーティング層形成組成液を下記の表1のように変更して実施して磁性シートを製造した。
実施例1と同一に実施して製造するものの、前記薄膜コーティング層を形成してロールプレス工程を通じて積層する代わりに、厚さが10μmである両面テープ(支持基材PET、ケイウォンコーポレーション、VT−8210C)を前記2枚のリボンシートの間に介在させて接着した磁性シートを製造した。
実施例と比較例に係る磁性シートの製造段階で準備された積層体について接着力を評価した。具体的には、積層された2枚のリボンシートの間の薄膜コーティング層の接着力を評価するために、磁性体破片を含む2枚のリボンシートで構成された磁性シートを手で分離し、この時、磁性シートが壊れる程度を評価して、接着力が非常によい場合を◎、よい場合をO、悪い場合を△、非常に悪い場合は×で表示して下記の表2に表示した。
実施例と比較例を通じて準備された磁性シートについて下記のような物性を評価して表2に表示した。
磁性シートの内部に備えられた磁性体の延伸力を測定するために、磁性シートを3cm×3cm大きさの試料にサンプリングし、両端から20kg/cm2の張力を加えて10秒間維持した後、磁性シートが破断する程度を評価して、実施例1を通じて製造された磁性シートを基準として1〜100の数値で表示した。(数字が大きいほど延伸力が優秀)
2.磁性体破片の剥離防止の程度の評価
磁性シートの内部に備えられた磁性体破片の剥離防止の程度を測定するために、磁性シートを3cm×3cm大きさの試料にサンプリングし、両端から20kg/cm2の張力を加えて10秒間維持した後、磁性シートの表面に磁性体破片の剥離防止の程度を肉眼で確認し、その結果を肉眼で評価して磁性体破片の剥離が全くない場合、非常によい場合を◎、よい場合をO、悪い場合を△、非常に悪い場合は×で表示した。
磁性シートを3cm×3cm大きさの試料にサンプリングし、プローブタック(Probe Tack)測定装備を利用してtack測定をしたのであり、このときプローブ(probe)の直径は5mmであり、測定条件はload 200gfの力で10秒の間維持した後、10mm/secでプーリング(pulling)してタック(tack)測定をした。
Claims (12)
- 可撓性を向上させるために磁性体シートが複数個の破片に粉砕した磁性層;および前記磁性層の少なくとも一面に形成された薄膜コーティング層;を含み、
前記薄膜コーティング層は、厚さが10μm以下であり、前記磁性層をシート状に維持および磁性体破片に加えられる外力を緩衝させるためにエチレン−プロピレン−ジエンゴム(Ethylene Propylene Diene Monomer、EPDM)からなる単一層である、磁性シート。 - 前記薄膜コーティング層は、隣接する磁性体破片のうち少なくとも一部の破片間に存在する離隔空間に一部が浸透又は全部が浸透している、請求項1に記載の磁性シート。
- 前記磁性層は、単一層の厚さが1〜30μmである、請求項1又は請求項2に記載の磁性シート。
- 前記磁性体破片は軟磁性体である磁性シートであり、
前記軟磁性体は金属軟磁性体またはフェライトを含む、請求項1〜請求項3のいずれか1項に記載の磁性シート。 - 前記金属軟磁性体は、Ni−Co系合金、Fe−Ni系合金、Fe−Cr系合金、Fe−Al系合金、Fe−Si系合金、Fe−Si−B系合金、Fe−Si−B−Cu−Nb系合金からなる群から選択された1種以上を含み、
前記フェライトは、Mn−Zn系フェライト、Ni−Zn系フェライト、Ni−Co系フェライト、Mg−Zn系フェライト、Cu−Zn系フェライト、およびコバルト置換Y型またはZ型六方晶系フェライトからなる群から選択された1種以上を含む、請求項4に記載の磁性シート。 - (1)磁性体シートの少なくとも一面にエチレン−プロピレン−ジエンゴム(Ethylene Propylene Diene Monomer、EPDM)を含む薄膜コーティング層形成組成物をコーティングした後固化させて厚さが10μm以下の単一層である薄膜コーティング層を形成させる段階;および
(2)薄膜コーティング層が形成された磁性体シートを破砕する段階;を含む、磁性シートの製造方法。 - アンテナコア;
前記アンテナコアの一面または両面にそれぞれ付着される請求項1〜請求項5のいずれか1項に記載された磁性シート;および
前記アンテナコアおよび前記磁性シートの外側面に巻かれるコイル;を含む、低周波アンテナ。 - 請求項1〜請求項5のいずれか1項に記載された磁性シート;および
前記磁性シートの外側面に巻かれるコイル;を含む、低周波アンテナ。 - 無線電力伝送用アンテナを含むアンテナユニット;
前記アンテナユニットの一面に配置されて無線電力伝送用アンテナ特性を向上させ、アンテナに向かって磁束を集束させる請求項1〜請求項5のいずれか1項に記載された磁性シートを少なくとも一つ以上具備する磁場ユニットを含む、無線電力伝送モジュール。 - 前記アンテナユニットは近距離通信(NFC)用アンテナおよびマグネチックセキュリティ伝送(MST)用アンテナのうちいずれか一つ以上をさらに含む、請求項9に記載の無線電力伝送モジュール。
- 近距離通信用アンテナを含むアンテナユニット;
前記アンテナユニットの一面に配置されて近距離通信用アンテナ特性を向上させ、アンテナに向かって磁束を集束させる請求項1〜請求項5のいずれか1項に記載された磁性シートを少なくとも一つ含む磁場ユニット;を含む、近距離通信モジュール。 - 請求項9に記載された無線電力伝送モジュールまたは請求項11に記載された近距離通信モジュールを受信用モジュールとして含む、携帯用機器。
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- 2016-10-05 WO PCT/KR2016/011149 patent/WO2017061773A1/ko active Application Filing
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US20180286546A1 (en) | 2018-10-04 |
CN108140479B (zh) | 2020-11-13 |
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