JP2018092457A - Airtight structure - Google Patents
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Abstract
Description
本発明は，無線センサモジュールを配置する密閉空間が内部に形成された密閉構造体に関する。 The present invention relates to a sealed structure in which a sealed space for arranging a wireless sensor module is formed.
所定の物理量を測定するセンサモジュールが実装され，センサモジュールが出力した測定データを無線通信により外部装置へ送信可能に構成された無線センサモジュールが開発されている。特許文献１で開示された無線センサモジュール（特許文献１では，温度センサ端末）は，物理量として温度を検出するセンサモジュールと，測定データである温度データを記憶するメモリと，メモリに記憶された温度データを無線通信で送信するための無線通信モジュールと，無線センサモジュールの動作を制御するコントローラモジュール（特許文献１では，制御モジュール）を備える。 A sensor module for measuring a predetermined physical quantity is mounted, and a wireless sensor module configured to transmit measurement data output from the sensor module to an external device by wireless communication has been developed. A wireless sensor module disclosed in Patent Document 1 (in Patent Document 1, a temperature sensor terminal) includes a sensor module that detects temperature as a physical quantity, a memory that stores temperature data that is measurement data, and a temperature that is stored in the memory. A wireless communication module for transmitting data by wireless communication and a controller module (control module in Patent Document 1) for controlling the operation of the wireless sensor module are provided.
特許文献１では，無線センサモジュールの無線通信モジュールをＩＥＥＥ８０２.１１規格に準拠したもの（Ｗｉｆｉ）にしているが，Ｂｌｕｅｔｏｏｔｈ（登録商標）の低消費電力化が進んだことを受けて，Ｂｌｕｅｔｏｏｔｈ（登録商標）を無線通信モジュールとして実装した無線センサモジュールが増えている。 In Patent Document 1, the wireless communication module of the wireless sensor module is a wireless communication module that conforms to the IEEE802.11 standard (WiFi). However, in response to the progress of low power consumption of Bluetooth (registered trademark), Bluetooth (registered) The number of wireless sensor modules mounting a trademark) as a wireless communication module is increasing.
上述の無線センサモジュールは，密閉容器や部屋など密閉構造体内の物理量の測定に用いられることがある。密閉構造体内の物理量の測定に無線センサモジュールを使用する場合，密閉構造体内に配置された無線センサモジュールの電波が密閉構造体の外側に届かなければならず，特許文献２で開示された発明では，密閉構造体の外側と内側で無線通信が行えるように，密閉構造体の壁を挟んで２つのアンテナを対向して配置している。 The wireless sensor module described above may be used to measure physical quantities in a sealed structure such as a sealed container or a room. When a wireless sensor module is used to measure a physical quantity in a sealed structure, radio waves from the wireless sensor module arranged in the sealed structure must reach the outside of the sealed structure. In the invention disclosed in Patent Document 2, The two antennas are arranged facing each other across the wall of the sealed structure so that wireless communication can be performed outside and inside the sealed structure.
電波遮蔽性を有する材料（例えば，金属）を用いて密閉構造体の壁が形成されていなければ，密閉構造体内に配置した無線センサモジュールのアンテナと対向させて，密閉構造体の外部にアンテナを配置する構成で，無線センサモジュールの電波を密閉構造体の外部で受信できる。しかし，電波遮蔽性を有する材料を用いて密閉構造体の壁が形成されている場合，上記のように構成しても，密閉構造体の壁により電波が遮蔽されるため，無線センサモジュールの電波を密閉構造体の外部で受信できない。 If the wall of the sealed structure is not formed using a radio wave shielding material (for example, metal), the antenna is placed outside the sealed structure so as to face the antenna of the wireless sensor module disposed in the sealed structure. With the arrangement, radio waves from the wireless sensor module can be received outside the sealed structure. However, when the wall of the sealed structure is formed using a material having radio wave shielding properties, the radio wave of the wireless sensor module is blocked because the radio wave is shielded by the wall of the sealed structure even if configured as described above. Cannot be received outside the sealed structure.
そこで，本発明は，無線センサモジュールを内部に配置する密閉構造体の形成に電波遮蔽性を有する材料が用いられている場合であっても，密閉性を損なうことなく，無線センサモジュールが放射する電波が外部に届くようにした密閉構造体を提供することを課題とする。 Therefore, the present invention radiates the wireless sensor module without damaging the sealing performance even when a material having radio wave shielding properties is used to form the sealing structure in which the wireless sensor module is disposed. It is an object to provide a sealed structure in which radio waves can reach the outside.
上述した課題を解決する第１の発明は，所定の物理量を測定するセンサモジュールを有し，直線偏波アンテナを用いて無線通信する無線センサモジュールと，前記無線センサモジュールを内部に配置する密閉空間が形成され，前記密閉空間と外部を隔てる絶縁封止材が設けられた筐体とから少なくとも構成され，前記無線センサモジュールの前記直線偏波アンテナの偏波方向が前記絶縁封止材の長手方向になるように，前記無線センサモジュールの前記直線偏波アンテナを前記絶縁封止材に対向させて配置したことを特徴とする密閉構造体である。 A first invention that solves the above-described problem includes a sensor module that measures a predetermined physical quantity, and performs wireless communication using a linearly polarized antenna, and a sealed space in which the wireless sensor module is disposed. Is formed at least from the sealed space and a housing provided with an insulating sealing material that separates the outside, and the polarization direction of the linearly polarized antenna of the wireless sensor module is the longitudinal direction of the insulating sealing material Thus, the sealed structure is characterized in that the linearly polarized antenna of the wireless sensor module is arranged to face the insulating sealing material.
上述した課題を解決する第２の発明は，第１の発明に記載の密閉構造体において，前記筐体は，開口部が設けられた筐体本体と，前記筐体本体の開口部と嵌合する密閉部材と，前記密閉部材を閉じたときに生じる隙間を塞ぐパッキンとから構成され，前記パッキンを前記絶縁封止材として利用するように構成したことを特徴とする。 A second invention that solves the above-described problem is the sealed structure according to the first invention, wherein the casing is fitted with a casing main body provided with an opening, and an opening of the casing main body. It is comprised from the sealing member which seals, and the packing which closes the clearance gap which arises when the said sealing member is closed, It comprised so that the said packing might be utilized as said insulation sealing material.
上述した本発明によれば，無線センサモジュールを内部に配置する密閉構造体の形成に電波遮蔽性を有する材料が用いられている場合であっても，密閉性を損なうことなく，無線センサモジュールが放射する電波が外部に届くようにした密閉構造体を提供できる。 According to the present invention described above, even when a material having radio wave shielding properties is used to form a sealing structure in which the wireless sensor module is disposed, the wireless sensor module can be used without impairing the sealing performance. A sealed structure in which radiated radio waves can reach the outside can be provided.
ここから，本発明の好適な実施形態を記載する。なお，以下の記載は本発明の技術的範囲を束縛するものでなく，理解を助けるために記述するものである。 From here, preferred embodiments of the present invention will be described. The following description is not intended to limit the technical scope of the present invention, but is provided to aid understanding.
図１は，本実施形態に係る密閉構造体１を説明する図である。本実施形態に係る密閉構造体１は，金属製容器，金属製箱や建屋の部屋など密閉空間１３が内部に形成される構造体で，所定の物理量を測定するセンサモジュール１１２を有し，直線偏波アンテナ１１０を用いて無線通信する無線センサモジュール１１と，無線センサモジュール１１を内部に配置する密閉空間１３が形成され，密閉空間１３と外部を隔てる絶縁封止材１２が設けられた筐体１０とから少なくとも構成される。密閉空間１３を形成する手法は任意であるが，本実施形態に係る密閉構造体１では，密閉部材となる筐体１０のドア１０ａにより筐体１０内が密閉される構造になっている。 FIG. 1 is a diagram illustrating a sealed structure 1 according to the present embodiment. The sealed structure 1 according to the present embodiment is a structure in which a sealed space 13 such as a metal container, a metal box, or a room of a building is formed. The sealed structure 1 includes a sensor module 112 that measures a predetermined physical quantity, A housing provided with a wireless sensor module 11 that performs wireless communication using a polarization antenna 110, a sealed space 13 in which the wireless sensor module 11 is disposed, and an insulating sealing material 12 that separates the sealed space 13 from the outside 10 at least. The method for forming the sealed space 13 is arbitrary, but the sealed structure 1 according to the present embodiment has a structure in which the inside of the casing 10 is sealed by the door 10a of the casing 10 serving as a sealing member.
図２は，筐体内に配置される無線センサモジュール１１のブロック図である。無線センサモジュール１１は，密閉構造体１の内部に形成された密閉空間１３内の所定の物理量を測定し，測定結果を無線通信により外部装置３（図１では，スマートフォン）へ送信するための装置である。図２で図示したように，無線センサモジュール１１は，所定の物理量を検出するセンサモジュール１１２と，センサモジュール１１２が出力した測定データを記憶するメモリ１１４と，直線偏波アンテナ１１０を利用して無線通信する無線通信モジュール１１１と，無線センサモジュール１１の動作を制御するコントローラモジュール１１３を備えている。 FIG. 2 is a block diagram of the wireless sensor module 11 arranged in the housing. The wireless sensor module 11 is a device for measuring a predetermined physical quantity in the sealed space 13 formed inside the sealed structure 1 and transmitting the measurement result to the external device 3 (smart phone in FIG. 1) by wireless communication. It is. As shown in FIG. 2, the wireless sensor module 11 wirelessly uses a sensor module 112 that detects a predetermined physical quantity, a memory 114 that stores measurement data output from the sensor module 112, and a linearly polarized antenna 110. A wireless communication module 111 for communication and a controller module 113 for controlling the operation of the wireless sensor module 11 are provided.
無線センサモジュール１１のセンサモジュール１１２は，具体的に，所定の物理量を測定するセンサとセンサ用の回路である。センサモジュール１１２が測定する物理量は任意でよいが，一般的には，温度，湿度，照度または振動になる。なお，無線センサモジュール１１が備えるセンサモジュール１１２の数は，一つのみでなく複数であってもよい。例えば，温度を測定するセンサモジュール１１２と，湿度を測定するセンサモジュール１１２の２つを無線センサモジュール１１に備えさせることができる。 The sensor module 112 of the wireless sensor module 11 is specifically a sensor for measuring a predetermined physical quantity and a circuit for the sensor. The physical quantity measured by the sensor module 112 may be arbitrary, but is generally temperature, humidity, illuminance, or vibration. Note that the number of sensor modules 112 included in the wireless sensor module 11 is not limited to one and may be plural. For example, the wireless sensor module 11 can include two sensor modules 112 that measure temperature and sensor module 112 that measures humidity.
無線センサモジュール１１のコントローラモジュール１１３は，具体的に，ファームウェアにより動作するプロセッサを含む電気回路で，無線通信モジュール１１１を利用して，センサモジュール１１２が出力した測定データを外部装置３へ送信する処理を行う。無線センサモジュール１１のコントローラモジュール１１３が実行する具体的な処理はファームウェアにより変更できる。センサモジュール１１２が出力した測定データを所定のサンプリング間隔で取得してメモリ１１４に記憶し，測定データの送信指示を外部装置３から無線通信で受けると，メモリ１１４に記憶している測定データを外部装置３へ無線通信により送信するように，コントローラモジュール１１３を構成できる。また，測定データの送信指示を外部装置３から無線通信で受けると，この時にセンサモジュール１１２が出力した測定データを外部装置３へ無線通信により送信するように，コントローラモジュール１１３を構成することもできる。 Specifically, the controller module 113 of the wireless sensor module 11 is an electric circuit including a processor operated by firmware, and uses the wireless communication module 111 to transmit measurement data output from the sensor module 112 to the external device 3. I do. Specific processing executed by the controller module 113 of the wireless sensor module 11 can be changed by firmware. The measurement data output from the sensor module 112 is acquired at a predetermined sampling interval and stored in the memory 114. When a measurement data transmission instruction is received from the external device 3 by wireless communication, the measurement data stored in the memory 114 is externally transmitted. The controller module 113 can be configured to transmit to the device 3 by wireless communication. Further, the controller module 113 can be configured to transmit the measurement data output from the sensor module 112 to the external device 3 by wireless communication when receiving the measurement data transmission instruction from the external device 3 by wireless communication. .
無線センサモジュール１１の無線通信モジュール１１１は，具体的に，外部装置３と無線通信するための回路である。無線センサモジュール１１が無線通信に用いる電波の周波数はＵＨＦ帯以上の周波数であることが望ましく，本実施形態において，無線センサモジュール１１の無線通信モジュール１１１は２．４５Ｇ帯を利用するＢｌｕｅｔｏｏｔｈ（登録商標）に対応したモジュールである。 Specifically, the wireless communication module 111 of the wireless sensor module 11 is a circuit for wirelessly communicating with the external device 3. The frequency of the radio wave used by the wireless sensor module 11 for wireless communication is preferably a frequency higher than the UHF band. In this embodiment, the wireless communication module 111 of the wireless sensor module 11 uses Bluetooth (registered trademark) that uses the 2.45G band. ).
無線センサモジュール１１と無線通信する外部装置３をスマートフォンとする場合，スマートフォンは，地面に対して水平な状態（タッチパネル面が上を向く状態）で利用されることが一般的であるため，本実施形態では，無線センサモジュール１１が無線通信に用いるアンテナを水平偏波用の直線偏波アンテナ１１０にしている。 When the external device 3 that wirelessly communicates with the wireless sensor module 11 is a smartphone, the smartphone is generally used in a state that is horizontal with respect to the ground (a state in which the touch panel surface faces upward). In the embodiment, the antenna used by the wireless sensor module 11 for wireless communication is a linearly polarized antenna 110 for horizontal polarization.
密閉構造体１の筐体１０の一部に設けられた絶縁封止材１２は，筐体１０内の密閉性を損なうことなく，無線センサモジュール１１が外部装置３と無線通信できるように設けられた部材である。密閉構造体１の筐体１０の一部に設ける絶縁封止材１２には，ゴム，エラストマー，プラスチック発泡体，プラスチック，セラミックおよびコンクリートのいずれかを利用できる。 The insulating sealing material 12 provided in a part of the casing 10 of the sealed structure 1 is provided so that the wireless sensor module 11 can wirelessly communicate with the external device 3 without impairing the sealing performance in the casing 10. It is a member. Any of rubber, elastomer, plastic foam, plastic, ceramic and concrete can be used for the insulating sealing material 12 provided in a part of the casing 10 of the sealed structure 1.
無線センサモジュール１１の直線偏波アンテナ１１０は，無線センサモジュール１１の直線偏波アンテナ１１０の偏波方向が絶縁封止材１２の長手方向になるように，絶縁封止材１２に対向して配置される。なお，絶縁封止材１２の長手方向とは，密閉構造体１の外側から絶縁封止材１２を見た時に長い方の方向を意味する。本実施形態では，無線センサモジュール１１の直線偏波アンテナ１１０を水平偏波用にしているため，直線偏波アンテナ１１０の偏波方向に該当する方向は水平方向になり，絶縁封止材１２の長手方向の辺は絶縁封止材１２の水平方向の辺になる。 The linearly polarized antenna 110 of the wireless sensor module 11 is disposed facing the insulating sealing material 12 so that the polarization direction of the linearly polarized antenna 110 of the wireless sensor module 11 is the longitudinal direction of the insulating sealing material 12. Is done. The longitudinal direction of the insulating sealing material 12 means the longer direction when the insulating sealing material 12 is viewed from the outside of the sealed structure 1. In the present embodiment, since the linearly polarized antenna 110 of the wireless sensor module 11 is for horizontal polarization, the direction corresponding to the polarization direction of the linearly polarized antenna 110 is horizontal, and the insulating sealing material 12 The side in the longitudinal direction is the side in the horizontal direction of the insulating sealing material 12.
無線センサモジュール１１の直線偏波アンテナ１１０の偏波方向が絶縁封止材の長手方向になるように，無線センサモジュール１１の直線偏波アンテナ１１０を絶縁封止材１２に対向して配置することで，無線センサモジュール１１が放射した電波が絶縁封止材１２を伝搬し易くなる。なお，絶縁封止材１２の長手方向の長さは，直線偏波アンテナ１１０が放射する電波の波長よりも長くすることが好適で，例えば，２．４５Ｇ帯を利用するＢＬＥを無線通信モジュール１１１に用いる場合，電波の波長は１２２．３６ｍｍになるため，絶縁封止材１２の長手方向の長さはこれよりも長くなる。 The linearly polarized antenna 110 of the wireless sensor module 11 is disposed to face the insulating sealing material 12 so that the polarization direction of the linearly polarized antenna 110 of the wireless sensor module 11 is the longitudinal direction of the insulating sealing material. Thus, the radio wave radiated from the wireless sensor module 11 can easily propagate through the insulating sealing material 12. The length in the longitudinal direction of the insulating sealing material 12 is preferably longer than the wavelength of the radio wave radiated from the linearly polarized antenna 110. For example, BLE using the 2.45G band is used as the wireless communication module 111. When used for the above, since the wavelength of the radio wave is 122.36 mm, the length of the insulating sealing material 12 in the longitudinal direction is longer than this.
図３は，絶縁封止材１２の設置方法を説明する図である。図１で図示した密閉構造体１では，絶縁封止材１２を設けるための孔１０ｂを筐体１０の一部に加工し，筐体１０の一部に加工した孔１０ｂに絶縁封止材１２を設置している。ゴムやエストラマーなど伸縮性のある材料を絶縁封止材１２に用いると，筐体１０に加工した孔１０ｂの大きさが絶縁封止材１２の断面サイズより若干小さくても，筐体１０に加工した孔１０ｂに絶縁封止材１２を収めることができる。 FIG. 3 is a diagram illustrating a method for installing the insulating sealing material 12. In the sealed structure 1 illustrated in FIG. 1, the hole 10 b for providing the insulating sealing material 12 is processed into a part of the housing 10, and the insulating sealing material 12 is formed into the hole 10 b processed into a part of the housing 10. Is installed. When a stretchable material such as rubber or elastomer is used for the insulating sealing material 12, it is processed into the housing 10 even if the size of the hole 10 b processed in the housing 10 is slightly smaller than the cross-sectional size of the insulating sealing material 12. The insulating sealing material 12 can be stored in the hole 10b.
なお，上述した密閉構造体１の形態は上述の方法に限定されない。図４は，変形例に係る密閉構造体２を説明する図である。変形例に係る密閉構造体２は，上部に矩形の開口部を設けた筐体本体２０ａと，筐体本体２０ａの開口部と嵌合する蓋体２０ｂから筐体２０を構成した容器で，蓋体２０ｂを閉じた状態で，筐体本体２０ａと蓋体２０ｂの間に生じる隙間をパッキン２２で塞ぐことで密閉空間２３が形成される構造になっている。 In addition, the form of the sealing structure 1 mentioned above is not limited to the above-mentioned method. FIG. 4 is a diagram for explaining a sealed structure 2 according to a modification. The sealed structure 2 according to the modified example is a container in which the casing 20 is configured by a casing main body 20a having a rectangular opening at the top, and a lid 20b fitted to the opening of the casing main body 20a. In a state where the body 20b is closed, a sealed space 23 is formed by closing a gap generated between the housing body 20a and the lid 20b with the packing 22.
図５は，変形例に係る密閉構造体２の部分拡大断面図である。筐体本体２０ａと蓋体２０ｂの間に生じる隙間を塞ぐパッキン２２は蓋体２０ｂに設けることもできるが，図５では，巴形のパッキン２２を筐体本体２０ａの開口部の縁に沿って設けている。筐体本体２０ａに設けられた開口部を蓋体２０ｂで塞いだときに，筐体本体２０ａの開口部の縁に沿って設けられた巴形のパッキン２２が蓋体２０ｂより押圧されることで，密閉空間２３が筐体２０内に形成される。変形例に係る密閉構造体２では，筐体本体２０ａと蓋体２０ｂの間に生じる隙間を塞ぐパッキン２２を図１の絶縁封止材１２として利用し，筐体２０の蓋体２０ｂの裏側に無線センサモジュール２１を取り付け，蓋体２０ｂの裏側に取り付けられた無線センサモジュール２１の直線偏波アンテナ２１０をパッキン２２と対向させて配置している。 FIG. 5 is a partially enlarged cross-sectional view of the sealed structure 2 according to the modification. The packing 22 that closes the gap generated between the housing body 20a and the lid 20b can be provided on the lid 20b. However, in FIG. 5, the bowl-shaped packing 22 is provided along the edge of the opening of the housing body 20a. Provided. When the opening provided in the housing body 20a is closed with the lid 20b, the bowl-shaped packing 22 provided along the edge of the opening of the housing body 20a is pressed from the lid 20b. , A sealed space 23 is formed in the housing 20. In the sealed structure 2 according to the modification, the packing 22 that closes the gap generated between the housing body 20a and the lid body 20b is used as the insulating sealing material 12 in FIG. The wireless sensor module 21 is attached, and the linearly polarized antenna 210 of the wireless sensor module 21 attached to the back side of the lid 20 b is disposed so as to face the packing 22.
１ 密閉構造体
１０ 筐体
１１ 無線センサモジュール
１１０ 直線偏波アンテナ
１１２ センサモジュール
１２ 絶縁封止材
１３ 密閉空間
２ 変形例に係る密閉構造体
２０ 筐体
２１ 無線センサモジュール
２１０ 直線偏波アンテナ
２２ パッキン
２３ 密閉空間
DESCRIPTION OF SYMBOLS 1 Sealing structure 10 Case 11 Wireless sensor module 110 Linearly polarized antenna 112 Sensor module 12 Insulating sealing material 13 Sealed space 2 Sealed structure according to modification 20 Housing 21 Wireless sensor module 210 Linearly polarized antenna 22 Packing 23 Sealed space
Claims (2)
前記無線センサモジュールの前記直線偏波アンテナの偏波方向が前記絶縁封止材の長手方向になるように，前記無線センサモジュールの前記直線偏波アンテナを前記絶縁封止材に対向させて配置したことを特徴とする密閉構造体。 A wireless sensor module having a sensor module for measuring a predetermined physical quantity and performing wireless communication using a linearly polarized antenna, and a sealed space in which the wireless sensor module is disposed are formed, and the sealed space is separated from the outside. And at least a casing provided with a sealing material,
The linearly polarized antenna of the wireless sensor module is arranged to face the insulating sealing material so that the polarization direction of the linearly polarized antenna of the wireless sensor module is the longitudinal direction of the insulating sealing material. A sealed structure characterized by that.
The housing includes a housing main body provided with an opening, a sealing member that fits into the opening of the housing main body, and a packing that closes a gap generated when the sealing member is closed, The sealed structure according to claim 1, wherein packing is used as the insulating sealing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016236422A JP2018092457A (en) | 2016-12-06 | 2016-12-06 | Airtight structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016236422A JP2018092457A (en) | 2016-12-06 | 2016-12-06 | Airtight structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2018092457A true JP2018092457A (en) | 2018-06-14 |
Family
ID=62566226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2016236422A Pending JP2018092457A (en) | 2016-12-06 | 2016-12-06 | Airtight structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2018092457A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022172461A1 (en) * | 2021-02-15 | 2022-08-18 | パナソニックＩｐマネジメント株式会社 | Ventilator and ventilating system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11317589A (en) * | 1998-05-01 | 1999-11-16 | Kitagawa Ind Co Ltd | Shielding case structure and shielding member |
| US6115677A (en) * | 1995-09-20 | 2000-09-05 | Fraunhofer-Gesellschaft Zur Foderung Der Angewandten Forschung E.V. | Consumption measurement system for remote reading |
| JP2002245581A (en) * | 2001-02-19 | 2002-08-30 | Nagano Japan Radio Co | Automatic meter-reading system and antenna device |
-
2016
- 2016-12-06 JP JP2016236422A patent/JP2018092457A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6115677A (en) * | 1995-09-20 | 2000-09-05 | Fraunhofer-Gesellschaft Zur Foderung Der Angewandten Forschung E.V. | Consumption measurement system for remote reading |
| JPH11317589A (en) * | 1998-05-01 | 1999-11-16 | Kitagawa Ind Co Ltd | Shielding case structure and shielding member |
| JP2002245581A (en) * | 2001-02-19 | 2002-08-30 | Nagano Japan Radio Co | Automatic meter-reading system and antenna device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022172461A1 (en) * | 2021-02-15 | 2022-08-18 | パナソニックＩｐマネジメント株式会社 | Ventilator and ventilating system |
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