JP2005192124A - 磁界アンテナ、それを用いて構成したワイヤレスシステムおよび通信システム - Google Patents
磁界アンテナ、それを用いて構成したワイヤレスシステムおよび通信システム Download PDFInfo
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- B29C53/02—Bending or folding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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Abstract
【解決手段】磁界アンテナを、磁界が到来することにより金属面4上に誘導される金属面に平行な磁界成分を受信し、そして金属面に平行な磁界成分を送信するために、金属面4に垂直の断面積成分を有するコイル2が金属面上に配置され、コイルは金属面との間に絶縁物3を介して密着固定されるとともに、磁界アンテナを使用周波数に共振させるためにコイルに並列または直列にコンデンサが装荷されている構成にした。
【選択図】図1
Description
まず、本発明による第1の磁界アンテナについて説明する。
図1は、本発明による第1の磁界アンテナの一実施形態を斜視図で示している。
図1において、1は本発明磁界アンテナ、2はコイル、3は絶縁物、4は金属板、および5は磁界アンテナが貼り付けられる被対象物の表面を示している。また、同図に示される矢印は金属板4の表面に平行な磁界成分を示している。
この本発明による第1の磁界アンテナは、図1に示すように、金属板4の絶縁物3側でない面に接着剤を塗布し被対象物5に貼り付けて使用する。
また、コイル2の断面形状は、図1に示す矩形に限られず円形断面などとしてももよいが、要するに、コイル2に起電力を生じさせるために、金属板4の表面に垂直の断面積成分を有することが必要である。
また、絶縁物3は、コイル2が金属板4の表面で短絡するのを防止するためのものである。
図2において、6はコンデンサ、7はメモリと書き込み、読み出しの機能を具えたICである。ここで、コンデンサ6はコイル2と共振させることによって、13.56MHzの磁界を選択受信するためのものである。
その他の部分は、図1と同じであるので同じ符号を付して示してある。
図3において、符号7で示されるICは、電源回路8、変復調回路9、制御回路10、およびメモリ11から構成されている。
コイル2とコンデンサ6からなる磁界アンテナで選択受信された信号は電源回路8に供給され、整流、平滑化されDC電圧が取り出され、変復調回路9および制御回路10にそれらの回路を駆動するための電源として供給される。変復調回路9は磁界アンテナによって受信された信号を復調して制御回路10に供給するとともに、制御回路10から受信した情報信号で搬送波を変調して磁界アンテナに供給するように構成されている。制御回路10は、メモリ11に受信された信号を書き込み、また、すでに書き込まれている情報信号を読み出して変復調回路9に供給する。
ICタグを代表とするワイヤレスシステムはよく知られているので、これ以上の説明は省略する。
本発明ワイヤレスシステムおよび通信システムは、また、本発明による第1の磁界アンテナを以下に説明する本発明による第2の磁界アンテナに置き換えても同様に実現できる。
図4は、本発明による第2の磁界アンテナの一実施形態を斜視図で示している。
図4において、12は本発明磁界アンテナ、2はコイル、3は絶縁物、4は金属板、13は磁性体、および5は磁界アンテナが貼り付けられる被対象物の表面を示している。また、同図に示される矢印は金属板4の表面に平行な磁界成分を示している。
実際には、第2の磁界アンテナの場合、コイルの下部に金属板があるので、これがインダクタンスLを見かけ上小さくし、それとの兼ね合いになる。
この特徴を活かして本発明による磁界アンテナは、物の生産現場や流通の段階、あるいは、人の出入りをチェックするシステムなど、広範囲に利用できるものである。
2 コイル
3 絶縁物
4 金属板
5 磁界アンテナが貼り付けられる被対象物の表面
6 コンデンサ
7 メモリと書き込み、読み出しの機能を具えたIC
8 電源回路
9 変復調回路
10 制御回路
11 メモリ
12 磁界アンテナ
13 磁性体
51 コイル
52 基板
53 情報記憶および読み出しの機能を具えたIC
Claims (12)
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面積成分を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されていることを特徴とする磁界アンテナ。
- 請求項1記載の磁界アンテナにおいて、前記金属面を有する金属板の前記金属面とは反対側の面に磁性体が被着されていることを特徴とする磁界アンテナ。
- 請求項1または2記載の磁界アンテナにおいて、前記コイルは、磁性体からなるコアを有することを特徴とする磁界アンテナ。
- 請求項2または3記載の磁界アンテナにおいて、前記磁性体は、フェライト磁性体またはフェライト磁性体以外の金属磁性体であることを特徴とする磁界アンテナ。
- 請求項2または3記載の磁界アンテナにおいて、前記磁性体は、球状、扁平状および破砕状のうちのいずれかの形状にして粉体化した磁性体を熱可塑性樹脂または熱硬化性樹脂中に分散し、固体化したものであることを特徴とする磁界アンテナ。
- 請求項1記載の磁界アンテナにおいて、前記金属面を有する金属の前記金属面とは反対側の面に接着剤を塗布し、該接着剤により磁界アンテナを被対象物に貼り付けるようにしたことを特徴とする磁界アンテナ。
- 請求項2記載の磁界アンテナにおいて、前記磁性体の前記金属が被着されているのとは反対側の面に接着剤を塗布し、該接着剤により磁界アンテナを被対象物に貼り付けるようにしたことを特徴とする磁界アンテナ。
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面積成分を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されている磁界アンテナのコイルの両端に、ワイヤレスシステム用ICチップが装着されていることを特徴とするワイヤレスシステム。
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面積成分を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定され、かつ前記金属面を有する金属板の前記金属面とは反対側の面に磁性体が被着されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されている磁界アンテナのコイルの両端に、ワイヤレスシステム用ICチップが装着されていることを特徴とするワイヤレスシステム。
- 請求項8または9記載のワイヤレスシステムにおいて、前記ICチップが有する入力容量を使用して前記コイルと共振させるために、コイルの巻線を調整して前記ワイヤレスシステムが使用する周波数に共振させるようにしたことを特徴とするワイヤレスシステム。
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面積成分を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されている磁界アンテナのコイルの両端に、通信システム用送受信回路が接続されていることを特徴とする通信システム。
- 磁界が到来することにより金属面上に誘導される前記金属面に平行な磁界成分を受信し、そして前記金属面に平行な磁界成分を送信するために、前記金属面に垂直の断面積成分を有するコイルが前記金属面上に配置され、前記コイルは前記金属面との間に絶縁物を介して密着固定され、かつ前記金属面を有する金属板の前記金属面とは反対側の面に磁性体が被着されるとともに、使用周波数において磁界アンテナを共振させるために前記コイルに並列または直列にコンデンサが装荷されている磁界アンテナのコイルの両端に、通信システム用送受信回路が接続されていることを特徴とする通信システム。
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EP04026015A EP1547753A1 (en) | 2003-12-26 | 2004-11-03 | Method and apparatus for molding thermosetting composite material |
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