JP3786683B2

JP3786683B2 - Environmental test equipment

Info

Publication number: JP3786683B2
Application number: JP2002268442A
Authority: JP
Inventors: 武彦辻
Original assignee: 株式会社マックシステムズ
Priority date: 2002-09-13
Filing date: 2002-09-13
Publication date: 2006-06-14
Anticipated expiration: 2022-09-13
Also published as: JP2004108807A

Description

【０００１】
【発明の属する技術分野】
本発明は環境試験装置、特に、電波を用いた機器の環境試験を行うための環境試験装置に関する。
【０００２】
【従来の技術】
従来より、各種機器について、様々な環境下での動作特性を測定する環境試験を行うために、内部を所定の環境状態に設定することができる環境試験装置が提案されてきた。例えば、試験槽として、内部を所定の温度に設定することができる恒温槽を備えた環境試験装置が挙げられる（例えば、特許文献１参照）。また、従来より、電波を用いた各種機器の利用が研究されている。このような機器の利用を確立するために、これらの機器についても、様々な環境下での動作特性を測定する環境試験を行う必要がある。
ところで、従来の環境試験装置としては、試験槽の外側面及び内側面の大部分を金属壁板で構成するようにしたものがある。この環境試験装置については、試験槽の外側面及び内側面の全体を金属壁で構成するようにすれば、試験槽の内部と外部とで電波を遮蔽する構造となる。
【０００３】
【特許文献１】
特開２００１−２５５３４９号公報
【０００４】
【発明が解決しようとする課題】
しかし、このような環境試験装置では、電波機器の環境試験を適切に行うことが困難であった。例えば、電波受信機の環境試験を行う場合、上述したような従来の環境試験装置を用いると、この環境試験装置の試験槽が電波遮蔽構造であるため、電波受信機について環境試験を行うのに、電波受信機だけでなく、電波送信機をも試験槽内に配置しなければならない。従って、試験が面倒であり、大型の環境試験装置を用いる必要がある。また、試験結果には、電波送信機の特性変化も含まれ、電波受信機のみの環境特性を正確に測定することが困難であった。
【０００５】
また、上述した従来の環境試験装置には、供試体を出し入れするための扉が設けられており、この扉を閉めたときに、扉と試験槽との間に介在して試験槽内を密閉するためのシール部材が取付られていた。このシール部材は、シリコンゴム等の非導電性ゴム製であるため、電波がこのシール部材を透過してしまい、電波の外部への漏れだし、あるいは試験空間内への電波の侵入などにより、環境試験を適切に行うことができない虞があった。
【０００６】
また、試験槽内には、試験空間の温度（環境状態）を検知する温度センサ（環境センサ）が設けられている。しかるに、試験空間内の電波が、この温度センサの出力に対してノイズとして重畳されることによって、温度の誤検知が生じる虞があった。あるいは、外部からの電波が温度センサを通じて試験空間内に侵入する虞もあった。このため、環境試験を適切に行うことができない虞があった。
【０００７】
本発明は、かかる現状に鑑みてなされたものであって、各種機器の電波に関する環境試験を容易に且つ適切に行うことができる環境試験装置を提供することを目的とする。具体的には、試験槽が小型であっても適切に環境試験を行いうる環境試験装置を提供することを目的とする。
【０００８】
【課題を解決するための手段、作用及び効果】
その解決手段は、試験槽を有し、この試験槽内の試験空間の温度を設定することができる環境試験装置であって、上記試験槽は、上記試験空間を包囲する試験槽壁と、この試験槽壁を貫通して形成された電波通過孔であって、この電波通過孔を通じて上記試験空間と上記環境試験装置外部との間で電波の送受信が可能な電波通過孔と、上記電波通過孔を経由した外部の環境状態の上記試験空間の環境状態に対する影響を遮断する遮断手段と、を備え、上記遮断手段は、上記電波通過孔を閉塞する電波透過性の断熱材を含み、上記断熱材より外側に位置し、上記電波通過孔を閉塞する外側閉塞部材であって、この外側閉塞部材のうち、上記電波通過孔をその軸線方向に投射した仮想投射領域に含まれる外側窓部の少なくとも一部は、電波透過性の材質からなる外側閉塞部材、及び、上記断熱材より内側に位置し、上記電波通過孔を閉塞する内側閉塞部材であって、この内側閉塞部材のうち、上記仮想投射領域に含まれる内側窓部の少なくとも一部は、電波透過性の材質からなる内側閉塞部材、を有し、上記外側閉塞部材と上記内側閉塞部材とで挟まれた空間は密閉されてなり、上記外側閉塞部材の上記外側窓部は、上記電波通過孔の軸線に対して斜めに配置され、上記内側閉塞部材の上記内側窓部は、上記電波通過孔の軸線に対して斜めに配置されてなる環境試験装置である。
【０００９】
本発明の環境試験装置では、試験槽壁を貫通する電波通過孔が形成され、試験空間と外部との間で電波の送受信を可能としている。このため、例えば、電波受信機（供試体）について環境試験を実施したい場合、電波送信機を外部に配置し、電波受信機だけを環境試験装置の試験槽内に配置するようにして環境試験を行うことができる。このため、本発明の環境試験装置では、試験槽が小型であっても適切に環境試験を行うことができる。また、電波送信機の環境特性に影響されることなく、供試体について正確に、温度特性などの環境特性を測定することができる。さらに、本発明の環境試験装置では、外部の環境状態が電波通過孔を通じて試験空間の環境状態に影響を与えないように、外部の環境状態を遮断する遮断手段を設けている。このため、試験空間を所定の環境状態に精度良く設定することができるので、供試体について、温度特性等の環境特性を正確に測定することができる。
【００１０】
さらに、本発明の環境試験装置では、電波透過性の断熱材によって電波通過孔を閉塞する。このため、電波通過孔を通じて外部と試験空間との間の熱の移動を防ぐことができ、試験槽内を所定の温度に精度良く設定することできる。
【００１１】
また、本発明の環境試験装置は、断熱材を挟むようにして、外側閉塞部材と内側閉塞部材とで電波通過孔を閉塞し、これらで囲まれる空間を密閉している。このため、外部の環境状態を遮断する遮断機能が高まり、より精度良く、試験空間の環境状態を所定の環境状態に設定することができる。
【００１２】
その上、本発明の環境試験装置では、外側閉塞部材の外側窓部が電波通過孔の軸線に対して斜めに配置され、内側閉塞部材の内側窓部が電波通過孔の軸線に対して斜めに配置されている。例えば、外部の電波送信機から電波通過孔の軸線方向に試験槽内の電波受信機に向かって電波を発射したとき、この送信電波のうち一部は、外側閉塞部材または内側閉塞部材で反射する。しかし、本発明の環境試験装置では、外側閉塞部材または内側閉塞部材が電波通過孔の軸線に対して斜めに配置されているので、この反射電波が電波送信機に戻ることを防止できる。また、試験槽内の電波送信機から電波通過孔の軸線方向に外部の電波受信機に向かって電波を送信したときについても同様である。なお、外側閉塞部材の外側窓部と内側閉塞部材の内側窓部とを、平行に配置したものに限定されるものではない。
【００１３】
なお、外部の環境状態を遮断する遮断手段としては、例えば、電波透過性の断熱材（例えば、ウレタンフォーム）で電波通過孔を閉塞する手段が挙げられる。また、電波透過性の素材（例えば、ポリテトラフルオロエチレン（商標名テフロン））で電波通過孔を閉塞するようにしても良い。さらに、これらを組合わせたものとしても良い。また、電波通過孔の内側または外側にエアカーテンを設けるようにしても良い。このようにすることで、電波通過孔を介して外部と試験空間との間で電波を送受信可能とすると共に、試験空間を所定の環境状態（特に、温度や湿度）に精度良く設定することができる。なお、環境試験装置としては、恒温槽、恒温恒湿槽、ヒートサイクル試験装置、熱衝撃試験装置、プレッシャクッカ試験装置等が挙げられる。
【００１４】
また、断熱材としては、例えば、ウレタンフォーム、発泡スチロール等が挙げられる。
【００１５】
さらに、外側閉塞部材の閉塞形態としては、例えば、全体が電波通過孔の中に位置して電波通過孔を閉塞するものが挙げられる。この場合、外側窓部は外側閉塞部材と一致する。また、外側閉塞部材の一部または全部が、電波通過孔の外側に位置して電波通過孔を閉塞するようにしても良い。内側閉塞部材についても同様に、全体が電波通過孔内に位置するもの、一部が電波通過孔より内側（試験空間側）に位置するもの、または全体が電波通過孔より内側（試験空間側）に位置するものが挙げられる。
【００１６】
また、外側閉塞部材及び内側閉塞部材の構成としては、例えば、全体が電波透過性の材質で構成されたものが挙げられる。また、外側窓部及び内側窓部が電波透過性の材質で、それ以外の部分を他の材質で構成するようにしても良い。また、外側窓部及び内側窓部の一部だけを電波透過性の材質で構成するようにしても良い。なお、外側閉塞部材及び内側閉塞部材に用いる電波透過性の材質としては、例えば、ポリテトラフルオロエチレン（商標名テフロン）が挙げられる。
ところで、本発明の環境試験装置は、断熱材として吸湿性を有する素材（例えば、ウレタンフォーム）を用いた場合、特に有効となる。すなわち、多湿な環境下で環境試験を行った場合でも、この断熱材は密閉空間内の配置されるために吸湿することがなく、断熱性の低下・劣化等を防止することができる。また、外側閉塞部材及び内側閉塞部材は、断熱材と隙間なく配置したり、断熱材との間にそれぞれ隙間を設けるようにしても良い。
【００１７】
他の解決手段は、試験槽を有し、この試験槽内の試験空間の温度を設定することができる環境試験装置であって、上記試験槽は、上記試験空間を包囲する試験槽壁と、この試験槽壁を貫通して形成された電波通過孔であって、この電波通過孔を通じて上記試験空間と上記環境試験装置外部との間で電波の送受信が可能な電波通過孔と、上記電波通過孔を経由した外部の環境状態の上記試験空間の環境状態に対する影響を遮断する遮断手段と、を備え、上記遮断手段は、上記電波通過孔を閉塞する外側閉塞部材と内側閉塞部材とを有し、上記外側閉塞部材は、上記内側閉塞部材より外側に位置し、この外側閉塞部材のうち、上記電波通過孔をその軸線方向に投射した仮想投射領域に含まれる外側窓部の少なくとも一部は、電波透過性の材質からなり、上記内側閉塞部材は、上記外側閉塞部材より内側に離れて位置し、この内側閉塞部材のうち、上記仮想投射領域に含まれる内側窓部の少なくとも一部は、電波透過性の材質からなり、上記外側閉塞部材と上記内側閉塞部材とで挟まれた空間は密閉されてなり、上記外側閉塞部材の上記外側窓部は、上記電波通過孔の軸線に対して斜めに配置され、上記内側閉塞部材の上記内側窓部は、上記電波通過孔の軸線に対して斜めに配置されてなる環境試験装置である。
【００１８】
本発明の環境試験装置では、試験槽壁を貫通する電波通過孔が形成され、試験空間と外部との間で電波の送受信を可能としている。このため、例えば、電波受信機（供試体）について環境試験を実施したい場合、電波送信機を外部に配置し、電波受信機だけを環境試験装置の試験槽内に配置するようにして環境試験を行うことができる。このため、本発明の環境試験装置では、試験槽が小型であっても適切に環境試験を行うことができる。また、電波送信機の環境特性に影響されることなく、供試体について正確に、温度特性などの環境特性を測定することができる。さらに、本発明の環境試験装置では、外部の環境状態が電波通過孔を通じて試験空間の環境状態に影響を与えないように、外部の環境状態を遮断する遮断手段を設けている。このため、試験空間を所定の環境状態に精度良く設定することができるので、供試体について、温度特性等の環境特性を正確に測定することができる。
【００１９】
また、本発明の環境試験装置では、外側閉塞部材と内側閉塞部材とによって電波通過孔を閉塞し、両部材で挟まれた空間が密閉されている。このため、外部の環境状態を遮断することができるので、試験空間の環境状態を所定の環境状態に精度良く設定することができる。
【００２０】
本発明の環境試験装置では、外側閉塞部材の外側窓部が電波通過孔の軸線に対して斜めに配置され、内側閉塞部材の内側窓部が電波通過孔の軸線に対して斜めに配置されている。例えば、外部の電波送信機から電波通過孔の軸線方向に試験槽内の電波受信機に向かって電波を発射したとき、この送信電波のうち一部は、外側閉塞部材または内側閉塞部材で反射する。しかし、本発明の環境試験装置では、外側閉塞部材または内側閉塞部材が電波通過孔の軸線に対して斜めに配置されているので、この反射電波が電波送信機に戻ることを防止できる。また、試験槽内の電波送信機から電波通過孔の軸線方向に外部の電波受信機に向かって電波を送信したときについても同様である。なお、外側閉塞部材の外側窓部と内側閉塞部材の内側窓部とを、平行に配置したものに限定されるものではない。
【００２１】
外側閉塞部材の閉塞形態としては、前述したものと同様に、例えば、全体が電波通過孔の中に位置して電波通過孔を閉塞するものが挙げられる。この場合、外側窓部は外側閉塞部材と一致する。また、外側閉塞部材の一部または全部が、電波通過孔の外側に位置して電波通過孔を閉塞するようにしても良い。内側閉塞部材についても同様に、全体が電波通過孔内に位置するもの、一部が電波通過孔より内側（試験空間側）に位置するもの、または全体が電波通過孔より内側（試験空間側）に位置するものが挙げられる。
【００２２】
また、外側閉塞部材及び内側閉塞部材の構成としては、前述したものと同様に、例えば、全体が電波透過性の材質で構成されたものが挙げられる。また、外側窓部及び内側窓部が電波透過性の材質で、それ以外の部分を他の材質で構成するようにしても良い。また、外側窓部及び内側窓部の一部だけを電波透過性の材質で構成するようにしても良い。なお、外側閉塞部材及び内側閉塞部材に用いる電波透過性の材質としては、例えば、ポリテトラフルオロエチレン（商標名テフロン）が挙げられる。
【００２３】
さらに、上記いずれかに記載の環境試験装置であって、前記試験槽壁の内側面の少なくとも一部は、電波吸収体層で被覆されてなる環境試験装置とすると良い。
【００２４】
本発明の環境試験装置は、試験槽壁の内側面の少なくとも一部が電波吸収体層で構成されている。このため、例えば、電波受信機を試験槽内に配置して環境試験を実施する場合、外部から送信された電波のうち、電波受信機に受信されないで電波受信機を通過したり、電波受信機で反射した電波は、試験槽の内側面で反射することなく電波吸収体層に吸収される。従って、本発明の環境試験装置では、試験槽内の供試体が試験槽の内側面で反射した電波を受信するなど、反射電波に影響されないので、正確な環境試験が実施可能となる。なお、電波吸収体層は、使用する周波数等を考慮して、その配置を決定すると良い。具体的には、周波数が比較的低い（例えば、１ＧＨｚ）場合には、試験槽壁の内側面全体に電波吸収体層を形成すると良い。一方、周波数が比較的高い（例えば、７０ＧＨｚ）場合には、電波の直進性が顕著となるため、反射防止に必要な部分にのみ電波吸収体層を形成しても良い。
【００２５】
さらに、上記いずれかの環境試験装置であって、前記電波通過孔の内周面は、斜め内側及び斜め外側の少なくともいずれかを向いてなる環境試験装置とすると良い。
【００２６】
本発明の環境試験装置は、電波通過孔の内周面が、斜め内側または斜め外側を向いている。換言すれば、電波通過孔の内周面の法線ベクトルが試験槽内部の方向（斜め内側）、または環境試験装置の外部の方向（斜め外側）を向いている。例えば、電波通過孔の内周面が斜め内側を向いている場合、外部に配置する電波送信機を、この傾斜を有する内周面を外部に延長した仮想内周面より電波通過孔から離れる側に配置すれば、電波送信機から送信された電波がこの内周面で反射して試験空間内に入ることがない。また、電波通過孔の内周面が斜め外側を向いている場合、試験槽内に配置する電波受信機を、この傾斜を有する内周面を試験槽内に延長した仮想内周面より電波通過孔から離れる側に配置すれば、外部から発射された電波のうちこの内周面で反射した電波が、電波受信機に入射することを防止できる。なお、試験槽内に電波送信機を配置し、外部に電波受信機を配置した場合も同様である。
【００２７】
さらに、上記いずれかの環境試験装置であって、前記電波通過孔の内周面は、内周面電波吸収体層で被覆されてなる環境試験装置とすると良い。
【００２８】
本発明の環境試験装置は、電波通過孔の内周面が内周面電波吸収体層で構成されている。このため、電波通過孔の内周面での電波の反射を防止できる。従って、本発明の環境試験装置では、電波通過孔の内周面で反射した電波が試験槽内に入ったり、外部に出ることがないので、反射電波に影響され難い環境試験が実施可能となる。
【００２９】
さらに、試験槽を有し、この試験槽内の試験空間を所定の環境状態に設定する環境試験装置であって、上記試験槽は、上記試験空間を包囲し、上記試験空間と上記環境試験装置外部とをつなぐ開口を有する包囲槽と、上記開口を閉塞する扉と、を有し、上記包囲槽は、上記試験空間を包囲する包囲槽壁であって、上記試験空間を包囲する包囲槽金属壁板を含む包囲槽壁を備え、上記包囲槽金属壁板は、上記開口の外側周縁まで延在し上記開口を囲んで露出する延在露出部含み、上記扉は、上記開口を塞ぐ扉金属壁板を備え、上記扉金属壁板は、上記扉で上記開口を閉塞したときに上記延在露出部に対向して露出する対向露出部を含み、上記延在露出部及び上記対向露出部の少なくともいずれかは、上記扉で上記開口を閉塞したとき、上記開口を環状に囲みつつ、上記延在露出部と上記対向露出部との間に介在し、両者を導通させる導通部材を備える環境試験装置とすると好ましい。
【００３０】
この環境試験装置では、扉で開口を閉塞したとき、開口を環状に包囲しつつ、延長露出部と対向露出部との間に介在し、両者を導通させる導通部材を備えている。このため、扉と包囲槽との間を通じて、電波が試験空間内に侵入したり、試験空間から漏れ出たりしないようにできる。
導通部材としては、延長露出部と対向露出部との間を導通できるものであれば良いが、例えば、線状またはチューブ状の導電性ゴムからなるシール部材が挙げられる。この場合、繰り返し使用することができる上、扉と包囲槽とを導通させるだけでなく、扉で開口を閉塞したときに扉と包囲槽との間を密閉することもできるので、別途シール部材を設ける必要はない。また、導通部材として、シリコンゴムチューブの外表面を金属メッシュで被覆した電波シールド部材を用いても良い。この場合には、この電波シールド部材よりも開口の径方向外側または径方向内側に、扉で開口を閉塞したときに扉と包囲槽との間を密閉するためのシール部材（例えば、シリコンゴムチューブ）を環状に設けると良い。
【００３１】
さらに、上記環境試験装置であって、前記導通部材は、前記扉で前記開口を閉塞したときに前記包囲槽と前記扉との間を密閉するシール部材を兼ねる環境試験装置とするのが好ましい。
【００３２】
この環境試験装置では、導通部材がシール部材を兼ねている。換言すれば、延長露出部と対向露出部との間を導通させることと、扉と包囲槽との間を密閉することを１つの部材で行っている。このため、本発明の環境試験装置は、部品点数を低減でき、製造容易となる。なお、シール部材を兼ねる導通部材としては、例えば、導電性ゴムからなるシール部材が挙げられる。
【００３３】
あるいは、上記環境試験装置であって、前記扉で前記開口を閉塞したときに、前記導通部材よりも前記開口の径方向内側または径方向外側に環状に位置するように配置され、前記包囲槽と前記扉との間を密閉するシール部材を有する環境試験装置とするのが好ましい。
【００３４】
この環境試験装置では、導通部材よりも開口の径方向内側または径方向外側に環状に配置された、包囲槽と扉との間を密閉するシール部材を有している。換言すれば、導通部材とシール部材とを別途設けている。前述した、導電性ゴムは高価であるため、環境試験装置がコスト高になる。これに対し、導通部材及びシール部材は、導電性ゴムに比して安価であるため、本発明の環境試験装置は安価となる。なお、導通部材としては、シリコンゴムの外表面を金属メッシュで被覆した電波シールド部材、シール部材としては、シリコンゴムが挙げられる。
【００３５】
さらに、試験槽を有し、この試験槽内の試験空間を所定の環境状態に設定する環境試験装置であって、上記試験槽内において上記試験空間の環境状態を検知する環境センサと、上記環境センサを包囲して電波を遮蔽する遮蔽部材であって、この遮蔽部材内部と上記試験空間との間を貫通する通気孔を有する遮蔽部材と、を備える環境試験装置とすると好ましい。
【００３６】
この環境試験装置では、環境センサが電波を遮蔽する遮蔽部材によって包囲されている。このため、例えば、試験空間内の電波が環境センサの出力に対してノイズとして重畳されることによって誤検知が生じる不具合や、外部からの電波が環境センサを通じて試験空間内に侵入する不具合を防止できる。さらに、この遮断部材は通気孔を有しているので、遮蔽部材内部の環境状態は試験空間の環境状態と同様になる。従って、本発明の環境試験装置では、環境センサによって、試験空間の環境状態を正確に検知することができる。なお、環境センサとしては、例えば、温度センサ、湿度センサが挙げられる。また、遮蔽部材としては、例えば、金属メッシュ、パンチングメタル等を有底筒状に成形したものが挙げられる。
【００３７】
【発明の実施の形態】
（実施形態）
本発明の実施の形態である環境試験装置１００について、図面を参照しつつ説明する。まず、本実施形態の環境試験装置１００の側面図を図１（ａ）に、正面視部分断面図を図１（ｂ）に示す。図１に示すように、環境試験装置１００は、試験槽１０１と、この上方に配置された恒温装置１０６とを有している。このうち、試験槽１０１は、Ｗ６６０（ｍｍ）×Ｈ６００（ｍｍ）×Ｄ９４０（ｍｍ）の外寸法で、包囲槽１０３と扉１０２とからなり、試験空間１２０を包囲している。このうち、包囲槽１０３は、開口１２１を有し、試験空間１２０を包囲する包囲槽壁１３１を備える。一方、扉１０２は開口１２１を閉塞する。なお、本実施形態では、包囲槽壁１３１及び扉１０２が試験槽壁に相当する。また、恒温装置１０６は、Ｗ６６０（ｍｍ）×Ｈ６２５（ｍｍ）×Ｄ９４０（ｍｍ）の外寸法で、制御装置１０５、図示しない冷凍機等を有している。このような環境試験装置１００は、−４０℃〜１００℃の範囲で試験空間１２０を恒温状態に設定することができる。
【００３８】
さらに、図１（ｂ）に示すように、包囲槽壁１３１（試験槽壁）のうち、正面から見て左側の側面をなす第１包囲槽壁部１３２には、これを貫通する電波通過孔１１０が形成されている。このため、試験空間１２０と環境試験装置１００の外部との間で電波の送受信が可能となっている。例えば、電波受信機（供試体）について環境試験を実施したい場合、電波送信機を外部に配置し、電波受信機だけを環境試験装置１００の試験空間１２０内に配置するようにして環境試験を行うことができる。このため、比較的小型の試験槽１０１を有する環境試験装置１００で、環境試験を行うことができる。
【００３９】
次に、包囲槽１０３及びその内部（試験空間１２０）について、図２を参照しつつ説明する。図２は、開口１２１（図１参照）側から包囲槽１０３を透視した透視断面図を示している。図２に示すように、包囲槽壁１３１（試験槽壁）は、外側から、外側包囲槽金属壁板１３４、断熱材１３５、内側包囲槽金属壁板１３６、電波吸収体層１３７の順に配置された４つの層で構成され、試験空間１２０を包囲している。この試験空間１２０の大きさは、Ｗ５００（ｍｍ）×Ｈ３５０（ｍｍ）×Ｄ３５０（ｍｍ）である。なお、本実施形態では、電波吸収体層１３７として、土とカーボンとを混練して焼成した電波吸収タイルを用いている。また、外側包囲槽金属壁板１３４及び内側包囲槽金属壁板１３６は、ステンレスによって形成されている。断熱材１３５は、ウレタンフォームで形成されている。
【００４０】
さらに、試験空間１２０内には、この試験空間１２０に温風や冷風を送り込む送風口１６１と、外部に空気を排出する排出口１６２が開口している。これらの開口には、外部からの電波の侵入及び外部への電波の漏洩を防止し、且つ通気可能とすべくハニカム状の金属構造材が嵌め込まれている。また、試験空間１２０内を所定の温度にするための温度センサ１７１が、包囲槽壁１３１（試験槽壁）の内側面１３１ｃから（本実施形態では、図２中奥から手前に向かって）突出して配置されている。すなわち、本実施形態では、環境センサとして、温度センサ１７１を設けている。また、図２中左側の壁には、上述の電波通過孔１１０が形成されており、この電波通過孔１１０を内側から閉塞する内側閉塞部材１５０が、包囲槽壁１３１（試験槽壁）の内側面１３１ｃから突出して配置されている。さらに、本実施形態では、電波吸収体層１３７がこれらの部分を除く内側包囲槽金属壁板１３６の内側面上に形成され、包囲槽壁１３１を被覆している。
【００４１】
このように、環境試験装置１００では、包囲槽壁１３１（試験槽壁）の内側面１３１ｃの大部分が電波吸収体層１３７で被覆されている。このため、例えば、電波受信機を試験空間１２０内に配置して環境試験を実施する場合、外部から送信された電波のうち、電波受信機に受信されないで電波受信機を通過したり、電波受信機で反射した電波は、包囲槽壁１３１（試験槽壁）の内側面１３１ｃで反射することなく電波吸収体層１３７に吸収される。従って、環境試験装置１００では、試験空間１２０内の供試体が包囲槽壁１３１（試験槽壁）の内側面１３１ｃで反射した電波をも受信するなど、反射電波に影響されないので、正確な環境試験が実施可能となる。
【００４２】
次に、扉１０２を開いた状態の試験槽１０１の斜視図を図３に示す。図３に示すように、包囲槽１０３の内側包囲槽金属壁板１３６（図２参照）は、開口１２１の外側周縁まで延在し、開口１２１を囲んで露出する環状の延在露出部１３６ｂを含んでいる。また、扉１０２は、開口１２１を塞ぐ内側扉金属壁板１２６を備え、この内側扉金属壁板１２６の内側面１２６ｃのうち、扉１０２を閉じたときに開口１２１に対向する部分には、電波吸収体層１２９を設けている。このため、扉１０２を閉じた状態で環境試験を行うとき、試験空間１２０内の電波が開口１２１の部分（扉１０２）で反射することを防止できる。なお、内側扉金属壁板１２６は、扉１０２で開口１２１を閉塞したときに延在露出部１３６ｂに対向して露出する環状の対向露出部１２６ｂ含んでいる。
【００４３】
さらに、この対向露出部１２６ｂには、導通部材１２７が環状に設けられている。この導通部材１２７は、扉１０２で開口１２１を閉塞したとき、開口１２１を環状に包囲しつつ、延長露出部１３６ｂと対向露出部１２６ｂとの間に介在し、両者を導通させる。このため、扉１０２と包囲槽１０３との間を通じて、電波が試験空間１２０内に侵入したり、試験空間１２０から漏れ出たりしないようにできる。なお、本実施形態では、導通部材１２７として、シリコンゴムチューブの外表面を金属メッシュで被覆した電波シールド部材を用いている。
【００４４】
さらに、延長露出部１３６ｂのうち開口１２１の外側周縁には、シール部材１２８が環状に設けられている。このシール部材１２８は、扉１０２で開口１２１を閉塞したとき、導通部材１２７よりも開口１２１の径方向内側に位置し、包囲槽１０３と扉１０２との間を密閉する。なお、本実施形態では、シール部材１２８として、シリコンゴムチューブを用いている。さらに、シール部材１２８自身に導電性ゴムを用いることもできる。この場合には、包囲槽１０３と扉１０２の密閉と、電波の侵入・漏洩防止とを兼ねるため、導通部材１２７が不要となる。
【００４５】
次に、図１（ｂ）のＢ部拡大図を図４に示す。図４に示すように、包囲槽壁１３１の第１包囲槽壁部１３２に形成した電波通過孔１１０内には、電波透過性の断熱材１１３（ウレタンフォーム）が配置されている。さらに、電波通過孔１１０の外側（図４中左側）には、電波透過性の外側窓部材１４１（ポリテトラフルオロエチレン（商標名テフロン）製の板材）（以下、テフロン板ともいう）有する外側閉塞部材１４０が配置されている。同様に、電波通過孔１１０の内側（試験空間１２０側（図４中右側））には、電波透過性の内側窓部材１５１（ポリテトラフルオロエチレン（商標名テフロン）製の板材）を有する内側閉塞部材１５０が配置されている。このため、環境試験装置１００では、電波通過孔１１０を通じて、環境試験装置１００の外部と試験空間１２０内との間で電波の送受信を可能としている。
【００４６】
ところで、電波通過孔１１０は、厚さ５０ｍｍのウレタンフォーム製の断熱材１１３によって閉塞されている。このため、電波通過孔１１０を通じて環境試験装置１００の外部（図２中左側）と試験空間１２０（図２中右側）との間の熱の移動を防ぐことができ、試験空間１２０内を所定の温度に精度良く設定することできる。さらに、電波通過孔１１０は、この外側（図４中左側）に配置された外側閉塞部材１４０によって外側から閉塞され、同様に、内側（図４中右側）に配置された内側閉塞部材１５０によって内側から閉塞されている。このように、環境試験装置１００では、断熱材１１３を挟むようにして、外側閉塞部材１４０と内側閉塞部材１５０とで電波通過孔１１０を閉塞し、これらで囲まれる空間を密閉している。このため、環境試験装置１００の外部と試験空間１２０との間の熱の移動防止等、環境試験装置１００の外部の環境状態を遮断する遮断機能が高まるので、より精度良く、試験空間１２０内の環境状態を所定の環境状態に設定することができる。本実施形態では、遮断手段として、断熱材１１３、外側閉塞部材１４０、内側閉塞部材１５０を設けている。
【００４７】
また、断熱材１１３を構成するウレタンフォームは、電波透過性に優れているが、吸湿性が高い材質である。このため、多湿な環境下で環境試験を行った場合には、断熱材１１３が吸湿してしまい、断熱性の低下・劣化等の原因となる。これに対し、環境試験装置１００では、外側閉塞部材１４０及び内側閉塞部材１５０によって、ウレタンフォーム製の断熱材１１３を密閉空間に配置している。このようにすることで、多湿な環境下で環境試験を行った場合でも、ウレタンフォーム製の断熱材１１３は吸湿することがなく、断熱性の低下・劣化等を防止することができる。
【００４８】
外側閉塞部材１４０は、矩形板状の外側窓部材１４１、この外側窓部材１４１を外側（図４中左側）から第１包囲槽壁部１３２に固定するための第１外側窓枠部材１４２及び第２外側窓枠部材１４３によって構成されている。外側窓部材１４１は、板厚２ｍｍのテフロン板で、図４に示すように、電波通過孔１１０を軸線Ｓの方向に投射した仮想投射領域Ｍに含まれる外側窓部１４１ｂを有している。第１外側窓枠部材１４２は、ベークライトからなり、矩形筒状で、開口端面１４２ｂが電波通過孔１１０の軸線Ｓに対し斜めに形成されている。第２外側窓枠部材１４３は、４本の矩形棒状体１４３ｂ，１４３ｃ，１４３ｄ，１４３ｅからなり、これらを矩形環状に配置したものである。外側閉塞部材１４０は、外側窓部材１４１の周縁部が第１外側窓枠部材１４２と第２外側窓枠部材１４３との間に挟まれて固定されることで一体に形成されている。そして、第１外側窓枠部材１４２に形成された図示しない貫通孔を利用して、タッピングスクリュ１１によって第１包囲槽壁部１３２の第１外側面１３２ｂにねじ止めされている。
【００４９】
内側閉塞部材１５０も同様に、矩形板状の内側窓部材１５１、この内側窓部材１５１を内側（試験空間１２０側（図４中右側））から第１包囲槽壁部１３２に固定するための第１内側窓枠部材１５２及び第２外側窓枠部材１５３によって構成されている。内側窓部材１５１は、板厚２ｍｍのテフロン板で、図４に示すように、電波通過孔１１０を軸線Ｓの方向に投射した仮想投射領域Ｍに含まれる内側窓部１５１ｂを有している。第１内側窓枠部材１５２は、ベークライトからなり、矩形筒状で、開口端面１５２ｂが電波通過孔１１０の軸線Ｓに対し斜めに形成されている。第２内側窓枠部材１５３は、４本の矩形棒状体１５３ｂ，１５３ｃ，１５３ｄ，１５３ｅからなり、これらを矩形環状に配置したものである。内側閉塞部材１５０は、内側窓部材１５１の周縁部が第１内側窓枠部材１５２と第２内側窓枠部材１５３との間に挟まれて固定されることで一体に形成されている。そして、第１内側窓枠部材１５２に形成された図示しない貫通孔を利用して、タッピングスクリュ１１によって第１包囲槽壁部１３２の第１内側面１３２ｃにねじ止めされている。
【００５０】
また、図４に示すように、電波通過孔１１０の内周面１１０ｂは、内周面電波吸収体層１１１で構成されている。このため、電波通過孔１１０の内周面１１０ｂでの電波の反射を防止できる。従って、環境試験装置１００では、電波通過孔１１０の内周面１１０ｂで反射した電波が試験槽１０１内に入ったり、外部に出ることを防止できるので、反射電波に影響され難い環境試験が実施可能となる。なお、本実施形態では、内周面電波吸収体層１１１として、土とカーボンとを混練して焼成した電波吸収タイルを用いている。
【００５１】
さらに、電波通過孔１１０の内周面１１０ｂは、斜め外側を向いている。換言すれば、内周面１１０ｂの法線ベクトルＮが環境試験装置１００の外部を向いている。このため、例えば、供試体として試験空間１２０内に電波受信機を配置する場合、この内周面１１０ｂを試験槽１０１内に延長した仮想内周面Ｌより電波通過孔１１０から離れる側に配置すれば、たとえ外部から発射された電波が内周面１１０ｂで反射したとしても、電波受信機に入射することを防止できる。なお、本実施形態では、内周面１１０ｂの法線ベクトルＮと電波通過孔１１０の軸線Ｓとがなす角は６０度となっている。
【００５２】
さらに、環境試験装置１００では、外側窓部材１４１が電波通過孔１１０の軸線Ｓに対して斜めに配置され、内側窓部材１５１も電波通過孔１１０の軸線Ｓに対して斜めに配置されている。例えば、外部の電波送信機から電波通過孔１１０の軸線Ｓの方向に沿って試験槽１０１内の電波受信機に向かって電波を発射したとき、この送信電波のうち一部は、外側閉塞部材１４０または内側閉塞部材１５０で反射する。しかし、環境試験装置１００では、外側窓部１４１及び内側窓部１５１が電波通過孔１１０の軸線Ｓに対して斜めに配置されているので、この反射電波が電波送信機に戻ることを防止できる。また、試験槽１０１内の電波送信機から電波通過孔１１０の軸線Ｓの方向に沿って外部の電波受信機に向かって電波を送信したときについても同様である。なお、本実施形態では、外側窓部材１４１と内側窓部材１５１とは平行に配置され、図４に示すように、電波通過孔１１０を側面視したとき、外側窓部１４１及び内側窓部１５１と電波通過孔１１０の軸線Ｓとのなす角は８０度となっている。
【００５３】
次いで、図２のＣ部の側方視断面図を図５に示す。図５に示すように、試験空間１２０に突出する温度センサ１７１は、筒状の金属メッシュからなる電波遮蔽部材１７０によって包囲されている。このため、例えば、試験空間１２０内の電波が温度センサ１７１の出力に対してノイズとして重畳されることによって温度の誤検知が生じる不具合や、外部からの電波が温度センサ１７１を通じて試験空間内に侵入する不具合を防止できる。さらに、電波遮蔽部材１７０は、多数の通気孔１７０ｂを有する金属メッシュで形成されているため、通気性に優れている。このため、電波遮蔽部材１７０内部の温度は、試験空間１２０内の温度と等しくなる。従って、環境試験装置１００では、温度センサ１７１によって、試験空間１２０内の温度を正確に検知することができる。なお、温度センサ１７１は、包囲槽壁１３１に形成された貫通孔１３１ｄを挿通しているが、外側包囲槽金属壁板１３４及び内側包囲槽金属壁板１３６と導通しないように、この部分を筒状のシリコンゴムで被覆している。また、電波遮蔽部材１７０は、内側包囲槽金属壁板１３６と導通するように配置されている。
なお、温度センサ１７１のほか湿度センサ等を有する場合にも、電波遮蔽部材１７０で覆うようにすれば良い。
【００５４】
このような、本実施形態の環境試験装置１００は、例えば、図６に示すようにして、電波を利用した機器の環境試験に用いられる。具体的には、電波受信機２０を環境試験装置１００の試験空間１２０内に配置し、環境試験装置１００の外部であって電波通過孔１１０を挟んで電波受信機２０と対向する位置に、電波送信機３０を配置する。そして、電波送信機３０から所定の周波数の電波を送信し、この電波を電波受信機２０によって受信する。このとき、恒温装置１０６の制御装置１０５によって、試験空間１２０内について、−２０℃の状態と６０℃の状態とを３０分ずつ繰り返すように変化させて、電波受信機２０の温度特性を測定する。
【００５５】
以上において、本発明を実施形態に即して説明したが、本発明は上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できることはいうまでもない。
例えば、実施形態の環境試験装置１００では、図４に示すように、断熱材１１３によって電波通過孔１１０を閉塞した。しかし、例えば、図７に示すように、断熱材１１３を設けないで、外側閉塞部材１４０と内側閉塞部材１５０とによって電波通過孔１１０を閉塞し、両部材で挟まれた空間を密閉するようにしても良い。
【００５６】
また、実施形態の環境試験装置１００では、図４に示すように、外側閉塞部材１４０の外側窓部材１４１と内側閉塞部材１５０の内側窓部材１５１とを平行に配置した。しかし、例えば、図８に示すように、内側閉塞部材１５０を上下反対に装着して、この内側閉塞部材２５０の内側窓部材１５１が、外側窓部材１４１と平行でなく、且つ電波通過孔１１０の軸線Ｓに対して斜めに配置するようにしても良い。
【００５７】
また、実施形態の環境試験装置１００では、図４に示すように、外側閉塞部材１４０が、第１外側窓枠部材１４２及び第２外側窓枠部材１４３と電波透過性の外側窓部材１４１とによって構成され、同様に、内側閉塞部材１５０も、第１内側窓枠部材１５２及び第２内側窓枠部材１５３と電波透過性の内側窓部材１５１とによって構成されていた。しかし、例えば、図９に示すように、外側閉塞部材３４０及び内側閉塞部材３５０の全体を電波透過性の材質で形成するようにしても良い。また、外側閉塞部材及び内側閉塞部材のいずれか一方について、その全体を電波透過性の材質で形成するようにしても良い。
【００５８】
また、実施形態の環境試験装置１００では、図４に示すように、外側閉塞部材１４０を電波通過孔１１０の外側（図４中左側）に配置し、内側閉塞部材１５０を電波通過孔１１０の内側（試験空間１２０側（図４中右側））に配置した。しかし、例えば、図１０に示すように、外側閉塞部材４４０及び内側閉塞部材４５０を電波通過孔１１０内に配置するようにしても良い。このとき、この外側閉塞部材４４０及び内側閉塞部材４５０の全体を、電波透過性の材質、例えば、ポリテトラフルオロエチレン（商標名テフロン）の板材で形成すると良い。
【００５９】
なお、図１０に示す形態では、断熱材４１３を電波通過孔１１０の中央に配置して、外側閉塞部材４４０及び内側閉塞部材４５０との間にそれぞれ空間を設けている。これに対し、図１１に示すように、外側閉塞部材４４０と断熱材５１３及び内側閉塞部材４５０と断熱材５１３が隙間なく接するように、それぞれを配置するようにしても良い。
また、実施形態の環境試験装置１００において、外側閉塞部材１４０と内側閉塞部材１５０とで囲まれた空間全体に断熱材を充填するようにしても良い。
【図面の簡単な説明】
【図１】実施形態にかかる環境試験装置１００を示す図であり、（ａ）はその側面図、（ｂ）はその正面視部分断面図である。
【図２】実施形態にかかる環境試験装置１００の包囲槽１０３の透視断面図である。
【図３】実施形態にかかる環境試験装置１００のうち、扉１０２を開いた状態の試験槽１０１の斜視図である。
【図４】図１のＢ部を示す図であり、実施形態にかかる環境試験装置１００の電波通過孔１１０付近の断面図である。
【図５】図２のＣ部の側方視断面図であり実施形態にかかる環境試験装置１００の温度センサ１７１付近を示す。
【図６】実施形態にかかる環境試験装置１００を用いた環境試験を説明する説明図である。
【図７】他の形態にかかる環境試験装置の電波通過孔１１０付近の断面図である。
【図８】他の形態にかかる環境試験装置の電波通過孔１１０付近の断面図である。
【図９】他の形態にかかる環境試験装置の電波通過孔１１０付近の断面図である。
【図１０】他の形態にかかる環境試験装置の電波通過孔１１０付近の断面図である。
【図１１】他の形態にかかる環境試験装置の電波通過孔１１０付近の断面図である。
【符号の説明】
１００環境試験装置
１０１試験槽
１０２扉（試験槽壁）
１０３包囲槽
１１０電波通過孔
１１０ｂ電波通過孔の内周面
１１１内周面電波吸収体層
１１３，４１３，５１３断熱材（遮断手段）
１２０試験空間
１２１開口
１２６内側扉金属壁板（扉金属壁板）
１２６ｂ対向露出部
１２７導通部材
１２８シール部材
１３１包囲槽壁（試験槽壁）
１３４外側包囲槽金属壁板（包囲槽金属壁板）
１３６内側包囲槽金属壁板（包囲槽金属壁板）
１３６ｂ延在露出部
１３７電波吸収体層
１４０，３４０，４４０外側閉塞部材（遮断手段）
１４１ｂ外側窓部
１５０，２５０，３５０，４５０内側閉塞部材（遮断手段）
１５１ｂ内側窓部
１７０電波遮蔽部材（遮蔽部材）
１７０ｂ通気孔
１７１温度センサ（環境センサ）
Ｍ仮想投射領域[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an environmental test apparatus, and more particularly to an environmental test apparatus for performing an environmental test on equipment using radio waves.
[0002]
[Prior art]
  2. Description of the Related Art Conventionally, environmental test apparatuses capable of setting the inside to a predetermined environmental state have been proposed in order to perform environmental tests for measuring operating characteristics of various devices under various environments. For example, as a test tank, an environmental test apparatus provided with a thermostatic chamber whose inside can be set to a predetermined temperature is mentioned (for example, refer to Patent Document 1). Conventionally, the use of various devices using radio waves has been studied. In order to establish the use of such devices, it is necessary to perform environmental tests on these devices to measure their operating characteristics in various environments.
  By the way, as a conventional environmental test apparatus, there is one in which most of the outer side surface and the inner side surface of the test tank are constituted by metal wall plates. About this environmental test apparatus, if the whole outer side surface and inner side surface of the test tank are made of metal walls, the structure is such that radio waves are shielded between the inside and outside of the test tank.
[0003]
[Patent Document 1]
  JP 2001-255349 A
[0004]
[Problems to be solved by the invention]
  However, with such an environmental test apparatus, it has been difficult to appropriately perform an environmental test on radio wave equipment. For example, when conducting an environmental test of a radio wave receiver, using a conventional environmental test apparatus as described above, the test tank of the environmental test apparatus has a radio wave shielding structure. In addition to radio receivers, radio transmitters must be placed in the test chamber. Therefore, the test is troublesome and it is necessary to use a large environmental test apparatus. In addition, the test results included changes in the characteristics of the radio wave transmitter, and it was difficult to accurately measure the environmental characteristics of only the radio wave receiver.
[0005]
  Further, the above-mentioned conventional environmental test apparatus is provided with a door for taking in and out the specimen, and when the door is closed, the inside of the test tank is sealed between the door and the test tank. The sealing member for doing was attached. Since this seal member is made of non-conductive rubber such as silicon rubber, radio waves may pass through this seal member, leak out of the radio waves, or enter the test space. There was a possibility that the test could not be performed properly.
[0006]
  Further, a temperature sensor (environment sensor) for detecting the temperature (environmental state) of the test space is provided in the test tank. However, there is a possibility that erroneous detection of temperature may occur when radio waves in the test space are superimposed as noise on the output of the temperature sensor. Alternatively, external radio waves may enter the test space through the temperature sensor. For this reason, there existed a possibility that an environmental test could not be performed appropriately.
[0007]
  The present invention has been made in view of the present situation, and an object of the present invention is to provide an environmental test apparatus that can easily and appropriately perform an environmental test on radio waves of various devices. Specifically, an object of the present invention is to provide an environmental test apparatus that can appropriately perform an environmental test even if the test tank is small.
[0008]
[Means, actions and effects for solving the problems]
  The solution includes a test tank and a test space in the test tank.The temperature ofSetbe able toAn environmental test apparatus, wherein the test tank includes a test tank wall surrounding the test space, and a radio wave passage hole formed through the test tank wall. A radio wave passage hole capable of transmitting and receiving radio waves to and from the outside of the environmental test apparatus, and a blocking means for blocking the influence of the external environmental state via the radio wave passage hole on the environmental state of the test space.The blocking means includes a radio wave-permeable heat insulating material that closes the radio wave passage hole, and is an outer closing member that is located outside the heat insulating material and closes the radio wave passage hole. Among them, at least a part of the outer window portion included in the virtual projection region that projects the radio wave passage hole in the axial direction thereof is located on the inner side of the outer closing member made of radio wave transmitting material, and the heat insulating material, An inner blocking member that blocks the radio wave passage hole, and of the inner blocking member, at least a part of the inner window portion included in the virtual projection area includes an inner blocking member made of a radio wave transmitting material. The space between the outer closing member and the inner closing member is hermetically sealed, and the outer window portion of the outer closing member is disposed obliquely with respect to the axis of the radio wave passage hole, Inside of the closing member Window portion, it is arranged obliquely to the axis of the wave passing holeEnvironmental test equipment.
[0009]
  In the environmental test apparatus of the present invention, a radio wave passage hole penetrating the test chamber wall is formed, and radio waves can be transmitted and received between the test space and the outside. Therefore, for example, if you want to conduct an environmental test on a radio receiver (specimen), perform the environmental test by placing the radio transmitter outside and placing only the radio receiver in the test tank of the environmental test equipment. It can be carried out. For this reason, in the environmental test apparatus of this invention, even if a test tank is small, an environmental test can be performed appropriately. Further, it is possible to accurately measure environmental characteristics such as temperature characteristics of the specimen without being affected by the environmental characteristics of the radio wave transmitter. Furthermore, the environmental test apparatus of the present invention is provided with a blocking means for blocking the external environmental state so that the external environmental state does not affect the environmental state of the test space through the radio wave passage hole. For this reason, since the test space can be accurately set to a predetermined environmental state, environmental characteristics such as temperature characteristics can be accurately measured for the specimen.
[0010]
Furthermore, in the environmental test apparatus of the present invention, the radio wave passage hole is closed with a radio wave permeable heat insulating material. For this reason, heat transfer between the outside and the test space can be prevented through the radio wave passage hole, and the inside of the test chamber can be accurately set to a predetermined temperature.
[0011]
Moreover, the environmental test apparatus of this invention obstruct | occludes the electric wave passage hole by the outer closing member and the inner closing member so as to sandwich the heat insulating material, and seals the space surrounded by these. For this reason, the interruption | blocking function which interrupts | blocks an external environmental state increases, and it can set the environmental state of a test space to a predetermined | prescribed environmental state more accurately.
[0012]
Moreover, in the environmental test apparatus of the present invention, the outer window portion of the outer blocking member is disposed obliquely with respect to the axis of the radio wave passage hole, and the inner window portion of the inner blocking member is inclined with respect to the axis line of the radio wave passage hole. Has been placed. For example, when a radio wave is emitted from an external radio wave transmitter toward the radio wave receiver in the test tank in the axial direction of the radio wave passage hole, a part of the transmitted radio wave is reflected by the outer blocking member or the inner blocking member. . However, in the environmental test apparatus of the present invention, the outer blocking member or the inner blocking member is disposed obliquely with respect to the axis of the radio wave passage hole, so that the reflected radio wave is transmitted to the radio wave transmitter. It can be prevented from returning. The same applies to the case where radio waves are transmitted from the radio wave transmitter in the test tank toward the external radio wave receiver in the axial direction of the radio wave passage hole. The outer window part of the outer closing member and the inner window part of the inner closing member are not limited to those arranged in parallel.
[0013]
  Examples of the blocking means for blocking the external environmental state include a means for closing the radio wave passage hole with a radio wave permeable heat insulating material (for example, urethane foam). Further, the radio wave passage hole may be closed with a radio wave transmitting material (for example, polytetrafluoroethylene (trade name: Teflon)). Furthermore, it is good also as what combined these. An air curtain may be provided inside or outside the radio wave passage hole. In this way, radio waves can be transmitted and received between the outside and the test space via the radio wave passage hole, and the test space can be accurately set to a predetermined environmental state (especially temperature and humidity). it can. In addition, as an environmental test apparatus, a constant temperature bath, a constant temperature and humidity tank, a heat cycle test apparatus, a thermal shock test apparatus, a pressure cooker test apparatus, etc. are mentioned.
[0014]
Moreover, as a heat insulating material, a urethane foam, a polystyrene foam etc. are mentioned, for example.
[0015]
Further, as a closing form of the outer closing member, for example, one in which the whole is located in the radio wave passage hole and closes the radio wave passage hole can be mentioned. In this case, the outer window coincides with the outer closing member. Further, a part or all of the outer blocking member may be positioned outside the radio wave passage hole to close the radio wave passage hole. Similarly, the inner blocking member is entirely located inside the radio wave passage hole, partially located inside the radio wave passage hole (test space side), or entirely inside the radio wave passage hole (test space side). The one located in is mentioned.
[0016]
Moreover, as a structure of an outer side obstruction | occlusion member and an inner side obstruction | occlusion member, what was entirely comprised with the radio wave permeable material is mentioned, for example. Further, the outer window portion and the inner window portion may be made of a radio wave transmitting material, and the other portions may be made of other materials. Moreover, you may make it comprise only a part of outer side window part and inner side window part with a radio wave-permeable material. In addition, as a radio wave permeable material used for an outer side obstruction | occlusion member and an inner side obstruction | occlusion member, polytetrafluoroethylene (brand name Teflon) is mentioned, for example.
By the way, the environmental test apparatus of the present invention is particularly effective when a hygroscopic material (for example, urethane foam) is used as the heat insulating material. That is, even when an environmental test is performed in a humid environment, the heat insulating material is not absorbed because it is disposed in the sealed space, and it is possible to prevent deterioration and deterioration of the heat insulating property. Moreover, you may make it arrange | position a clearance gap between an outer closing member and an inner closing member without a clearance gap between heat insulation materials, or a heat insulation material.
[0017]
Another solution is an environmental test apparatus having a test tank and capable of setting the temperature of the test space in the test tank, wherein the test tank includes a test tank wall surrounding the test space; A radio wave passage hole formed through the test chamber wall, through which the radio wave can be transmitted and received between the test space and the outside of the environmental test apparatus, and the radio wave passage hole. A blocking means for blocking the influence of the external environmental state via the hole on the environmental condition of the test space, and the blocking means includes an outer blocking member and an inner blocking member that block the radio wave passage hole. The outer blocking member is located outside the inner blocking member, and at least a part of the outer window portion included in the virtual projection region in which the radio wave passage hole is projected in the axial direction of the outer blocking member is, From radio wave permeable material The inner closing member is located away from the outer closing member, and at least a part of the inner window portion included in the virtual projection area is made of a radio wave transmissive material. The space between the outer blocking member and the inner blocking member is hermetically sealed, and the outer window portion of the outer blocking member is disposed obliquely with respect to the axis of the radio wave passage hole, The inner window portion of the member is an environmental test apparatus arranged obliquely with respect to the axis of the radio wave passage hole.
[0018]
In the environmental test apparatus of the present invention, a radio wave passage hole penetrating the test chamber wall is formed, and radio waves can be transmitted and received between the test space and the outside. Therefore, for example, if you want to conduct an environmental test on a radio receiver (specimen), perform the environmental test by placing the radio transmitter outside and placing only the radio receiver in the test tank of the environmental test equipment. It can be carried out. For this reason, in the environmental test apparatus of this invention, even if a test tank is small, an environmental test can be performed appropriately. Further, it is possible to accurately measure environmental characteristics such as temperature characteristics of the specimen without being affected by the environmental characteristics of the radio wave transmitter. Furthermore, the environmental test apparatus of the present invention is provided with a blocking means for blocking the external environmental state so that the external environmental state does not affect the environmental state of the test space through the radio wave passage hole. For this reason, since the test space can be accurately set to a predetermined environmental state, environmental characteristics such as temperature characteristics can be accurately measured for the specimen.
[0019]
In the environmental test apparatus of the present invention, the radio wave passage hole is closed by the outer closing member and the inner closing member, and the space sandwiched between the two members is sealed. For this reason, since an external environmental state can be interrupted | blocked, the environmental state of a test space can be accurately set to a predetermined environmental state.
[0020]
In the environmental test apparatus of the present invention, the outer window portion of the outer blocking member is disposed obliquely with respect to the axis of the radio wave passage hole, and the inner window portion of the inner blocking member is disposed obliquely with respect to the axis of the radio wave passage hole. Yes. For example, when a radio wave is emitted from an external radio wave transmitter toward the radio wave receiver in the test tank in the axial direction of the radio wave passage hole, a part of the transmitted radio wave is reflected by the outer blocking member or the inner blocking member. . However, in the environmental test apparatus of the present invention, since the outer blocking member or the inner blocking member is disposed obliquely with respect to the axis of the radio wave passage hole, it is possible to prevent this reflected radio wave from returning to the radio wave transmitter. The same applies to the case where radio waves are transmitted from the radio wave transmitter in the test tank toward the external radio wave receiver in the axial direction of the radio wave passage hole. The outer window part of the outer closing member and the inner window part of the inner closing member are not limited to those arranged in parallel.
[0021]
As the closing form of the outer closing member, for example, the one that is entirely located in the radio wave passage hole and closes the radio wave passage hole is mentioned, as described above. In this case, the outer window coincides with the outer closing member. Further, a part or all of the outer blocking member may be positioned outside the radio wave passage hole to close the radio wave passage hole. Similarly, the inner blocking member is entirely located inside the radio wave passage hole, partially located inside the radio wave passage hole (test space side), or entirely inside the radio wave passage hole (test space side). The one located in is mentioned.
[0022]
Moreover, as a structure of an outer side obstruction | occlusion member and an inner side obstruction | occlusion member, the thing comprised entirely by the radio wave permeable material is mentioned similarly to what was mentioned above, for example. Further, the outer window portion and the inner window portion may be made of a radio wave transmitting material, and the other portions may be made of other materials. Moreover, you may make it comprise only a part of outer side window part and inner side window part with a radio wave-permeable material. In addition, as a radio wave permeable material used for an outer side obstruction | occlusion member and an inner side obstruction | occlusion member, polytetrafluoroethylene (brand name Teflon) is mentioned, for example.
[0023]
  In addition, the aboveListed in anyIt is preferable that at least a part of the inner side surface of the test tank wall is an environmental test apparatus covered with a radio wave absorber layer.
[0024]
  In the environmental test apparatus of the present invention, at least a part of the inner surface of the test tank wall is constituted by a radio wave absorber layer. For this reason, for example, when an electromagnetic wave receiver is placed in a test tank and an environmental test is performed, out of radio waves transmitted from the outside, the radio wave receiver does not receive the radio wave receiver, The radio wave reflected by is absorbed by the radio wave absorber layer without being reflected by the inner surface of the test tank. Therefore, in the environmental test apparatus of the present invention, an accurate environmental test can be performed because the specimen in the test tank is not affected by the reflected radio waves such as receiving the radio waves reflected by the inner surface of the test tank. Note that the arrangement of the radio wave absorber layer may be determined in consideration of the frequency to be used. Specifically, when the frequency is relatively low (for example, 1 GHz), a radio wave absorber layer may be formed on the entire inner surface of the test chamber wall. On the other hand, when the frequency is relatively high (for example, 70 GHz), since the straightness of the radio wave becomes remarkable, the radio wave absorber layer may be formed only in a portion necessary for antireflection.
[0025]
  Furthermore, in any one of the environmental test apparatuses described above, the inner peripheral surface of the radio wave passage hole may be an environmental test apparatus that faces at least one of an obliquely inner side and an obliquely outer side.
[0026]
  In the environmental test apparatus of the present invention, the inner peripheral surface of the radio wave passage hole faces obliquely inside or obliquely outside. In other words, the normal vector of the inner peripheral surface of the radio wave passage hole is directed in the direction inside the test chamber (diagonally inside) or the outside of the environmental test apparatus (diagonally outside). For example, when the inner peripheral surface of the radio wave passage hole faces diagonally inward, the radio transmitter placed outside is located on the side away from the radio wave passage hole from the virtual inner peripheral surface that extends the inclined inner peripheral surface to the outside. The radio wave transmitted from the radio wave transmitter is not reflected by this inner peripheral surface and does not enter the test space. In addition, when the inner peripheral surface of the radio wave passage hole faces diagonally outward, the radio wave receiver placed in the test tank passes the radio wave from the virtual inner peripheral surface obtained by extending the inclined inner peripheral surface into the test tank. If it is arranged on the side away from the hole, it is possible to prevent radio waves reflected from the inner peripheral surface of radio waves emitted from the outside from entering the radio receiver. The same applies when a radio wave transmitter is arranged in the test tank and a radio wave receiver is arranged outside.
[0027]
  Furthermore, in any one of the above-described environmental test apparatuses, the inner peripheral surface of the radio wave passage hole may be an environmental test apparatus that is covered with an inner peripheral surface radio wave absorber layer.
[0028]
  In the environmental test apparatus of the present invention, the inner peripheral surface of the radio wave passage hole is constituted by an inner peripheral surface wave absorber layer. For this reason, the reflection of the radio wave at the inner peripheral surface of the radio wave passage hole can be prevented. Therefore, in the environmental test apparatus of the present invention, the radio wave reflected by the inner peripheral surface of the radio wave passage hole does not enter the test tank or go out to the outside. .
[0029]
  further,An environmental test apparatus having a test tank and setting the test space in the test tank to a predetermined environmental state, wherein the test tank surrounds the test space, and includes the test space and the outside of the environmental test apparatus. An enclosure tank having an opening for connecting the opening and a door for closing the opening, and the enclosure tank is an enclosure tank wall surrounding the test space, the enclosure tank metal wall plate surrounding the test space The enclosure tank metal wall plate includes an extended exposed portion that extends to the outer peripheral edge of the opening and surrounds the opening, and the door is a door metal wall plate that closes the opening. The door metal wall plate includes an opposing exposed portion that is exposed to face the extended exposed portion when the opening is closed by the door, and at least one of the extended exposed portion and the opposed exposed portion When the opening is closed by the door, the opening is made into an annular shape. Mitsutsu, interposed between the extending exposed portion and the opposite exposed portion, environmental testing apparatus including a conductive member for conducting bothIs preferable.
[0030]
  ThisIn the environmental test apparatus, when the opening is closed with the door, a conductive member is provided between the extended exposed portion and the opposed exposed portion so as to enclose the opening in an annular shape and electrically connect both. For this reason, it is possible to prevent radio waves from entering the test space or leaking out from the test space through the door and the surrounding tank.
  Any conductive member may be used as long as it can conduct between the extended exposed portion and the opposed exposed portion. For example, a sealing member made of linear or tube-shaped conductive rubber may be used. In this case, not only can the door and the surrounding tub be connected to each other, but also the door and the surrounding tub can be sealed when the opening is closed with the door. There is no need to provide it. Moreover, you may use the electromagnetic wave shielding member which coat | covered the outer surface of the silicon rubber tube with the metal mesh as a conduction | electrical_connection member. In this case, a seal member (for example, a silicon rubber tube) for sealing the space between the door and the enclosing tub when the opening is closed with the door, on the radially outer side or radially inner side of the opening than the radio wave shielding member. ) May be provided in an annular shape.
[0031]
  Furthermore, in the environmental test apparatus, it is preferable that the conductive member is an environmental test apparatus that also serves as a seal member that seals between the enclosure tank and the door when the opening is closed by the door.
[0032]
  ThisIn the environmental test apparatus, the conductive member also serves as the seal member. In other words, a single member performs electrical connection between the extended exposed portion and the opposed exposed portion and seals between the door and the surrounding tank. For this reason, the environmental test apparatus of this invention can reduce a number of parts, and becomes easy to manufacture. An example of the conductive member that also serves as the seal member is a seal member made of conductive rubber.
[0033]
  Alternatively, in the environmental test apparatus, when the opening is closed by the door, the opening is disposed so as to be annularly located on a radially inner side or a radially outer side of the opening than the conductive member, It is preferable to use an environmental test apparatus having a seal member that seals between the door.
[0034]
  ThisThis environmental test apparatus has a seal member that is arranged in a ring shape radially inward or radially outward of the opening relative to the conducting member and seals between the enclosure tank and the door. In other words, a conducting member and a seal member are separately provided. Since the conductive rubber described above is expensive, the environmental test apparatus is expensive. On the other hand, since the conducting member and the seal member are cheaper than the conductive rubber, the environmental test apparatus of the present invention is inexpensive. The conducting member may be a radio wave shielding member whose outer surface is covered with a metal mesh, and the sealing member may be silicon rubber.
[0035]
  furtherAn environmental test apparatus that has a test tank and sets the test space in the test tank to a predetermined environmental state, the environmental sensor detecting the environmental state of the test space in the test tank, and the environmental sensor An environmental test apparatus comprising: a shielding member that surrounds the shielding member and shields radio waves, the shielding member having a ventilation hole penetrating between the inside of the shielding member and the test spaceIs preferable.
[0036]
  ThisIn this environmental test apparatus, the environmental sensor is surrounded by a shielding member that shields radio waves. For this reason, it is possible to prevent, for example, problems that false detection occurs when radio waves in the test space are superimposed as noise on the output of the environmental sensor, and problems that radio waves from outside enter the test space through the environmental sensor. . Furthermore, since this blocking member has a vent hole, the environmental state inside the shielding member is the same as the environmental state of the test space. Therefore, in the environmental test apparatus of the present invention, the environmental state of the test space can be accurately detected by the environmental sensor. In addition, as an environmental sensor, a temperature sensor and a humidity sensor are mentioned, for example. Moreover, as a shielding member, what shape | molded the metal mesh, the punching metal, etc. in the bottomed cylinder shape is mentioned, for example.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
  (Embodiment)
  An environmental test apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1A shows a side view of the environmental test apparatus 100 of the present embodiment, and FIG. As shown in FIG. 1, the environmental test apparatus 100 includes a test tank 101 and a thermostatic device 106 disposed above the test tank 101. Among these, the test tank 101 has an outer dimension of W660 (mm) × H600 (mm) × D940 (mm), and includes the enclosure tank 103 and the door 102, and surrounds the test space 120. Among these, the surrounding tank 103 has an opening 121 and includes an surrounding tank wall 131 that surrounds the test space 120. On the other hand, the door 102 closes the opening 121. In this embodiment, the surrounding tank wall 131 and the door 102 correspond to the test tank wall. The thermostatic device 106 has an outer dimension of W660 (mm) × H625 (mm) × D940 (mm), and includes a control device 105, a refrigerator (not shown), and the like. Such an environmental test apparatus 100 can set the test space 120 to a constant temperature in the range of −40 ° C. to 100 ° C.
[0038]
  Further, as shown in FIG. 1 (b), in the surrounding tank wall 131 (test tank wall), the first surrounding tank wall portion 132 that forms the left side when viewed from the front has a radio wave passage hole penetrating therethrough. 110 is formed. For this reason, radio waves can be transmitted and received between the test space 120 and the outside of the environmental test apparatus 100. For example, when it is desired to perform an environmental test on a radio wave receiver (specimen), the environmental test is performed by arranging the radio wave transmitter outside and placing only the radio wave receiver in the test space 120 of the environmental test apparatus 100. be able to. For this reason, the environmental test can be performed by the environmental test apparatus 100 having the relatively small test tank 101.
[0039]
  Next, the surrounding tank 103 and the inside (test space 120) will be described with reference to FIG. FIG. 2 shows a perspective sectional view of the surrounding tank 103 seen from the opening 121 (see FIG. 1) side. As shown in FIG. 2, the surrounding tank wall 131 (test tank wall) is arranged from the outside in the order of the outer surrounding tank metal wall plate 134, the heat insulating material 135, the inner surrounding tank metal wall plate 136, and the radio wave absorber layer 137. The test space 120 is surrounded by four layers. The size of the test space 120 is W500 (mm) × H350 (mm) × D350 (mm). In the present embodiment, as the radio wave absorber layer 137, a radio wave absorption tile obtained by kneading and firing soil and carbon is used. Further, the outer surrounding tank metal wall plate 134 and the inner surrounding tank metal wall plate 136 are made of stainless steel. The heat insulating material 135 is formed of urethane foam.
[0040]
  Furthermore, in the test space 120, an air outlet 161 for sending warm air or cold air into the test space 120 and an outlet 162 for discharging air to the outside are opened. In these openings, a honeycomb-shaped metal structure material is fitted so as to prevent invasion of radio waves from the outside and leakage of radio waves to the outside and to allow ventilation. Further, a temperature sensor 171 for bringing the inside of the test space 120 to a predetermined temperature protrudes from the inner side surface 131c of the surrounding tank wall 131 (test tank wall) (in this embodiment, from the back to the front in FIG. 2). Are arranged. That is, in this embodiment, the temperature sensor 171 is provided as an environmental sensor. In addition, the above-described radio wave passage hole 110 is formed in the left wall in FIG. 2, and an inner closing member 150 that closes the radio wave passage hole 110 from the inside is included in the surrounding tank wall 131 (test tank wall). It protrudes from the side 131c. Furthermore, in this embodiment, the radio wave absorber layer 137 is formed on the inner side surface of the inner enclosure tank metal wall plate 136 excluding these portions, and covers the enclosure tank wall 131.
[0041]
  Thus, in the environmental test apparatus 100, most of the inner side surface 131 c of the surrounding tank wall 131 (test tank wall) is covered with the radio wave absorber layer 137. For this reason, for example, when the radio wave receiver is arranged in the test space 120 and the environmental test is performed, the radio wave transmitted from the outside is not received by the radio wave receiver and passes through the radio wave receiver or is received. The radio wave reflected by the machine is absorbed by the radio wave absorber layer 137 without being reflected by the inner side surface 131c of the surrounding tank wall 131 (test tank wall). Therefore, in the environmental test apparatus 100, since the specimen in the test space 120 also receives the radio wave reflected by the inner surface 131c of the surrounding tank wall 131 (test tank wall), it is not affected by the reflected radio wave. Can be implemented.
[0042]
  Next, a perspective view of the test tank 101 with the door 102 opened is shown in FIG. As shown in FIG. 3, the inner enclosure metal wall plate 136 (see FIG. 2) of the enclosure 103 has an annular extended exposed portion 136 b that extends to the outer peripheral edge of the opening 121 and is exposed around the opening 121. Contains. Further, the door 102 includes an inner door metal wall plate 126 that closes the opening 121, and a portion of the inner side surface 126 c of the inner door metal wall plate 126 that faces the opening 121 when the door 102 is closed is exposed to radio waves. An absorber layer 129 is provided. For this reason, when an environmental test is performed with the door 102 closed, the radio waves in the test space 120 can be prevented from being reflected by the portion of the opening 121 (the door 102). The inner door metal wall plate 126 includes an annular opposed exposed portion 126b that is exposed to face the extended exposed portion 136b when the opening 121 is closed by the door 102.
[0043]
  Further, a conductive member 127 is provided in an annular shape in the opposed exposed portion 126b. When the opening 121 is closed by the door 102, the conducting member 127 is interposed between the extended exposed portion 136b and the counter-exposed portion 126b while enclosing the opening 121 in an annular shape, and makes the two conductive. For this reason, it is possible to prevent radio waves from entering the test space 120 or leaking from the test space 120 through the space between the door 102 and the surrounding tank 103. In the present embodiment, a radio wave shielding member in which the outer surface of the silicon rubber tube is covered with a metal mesh is used as the conductive member 127.
[0044]
  Further, a seal member 128 is annularly provided on the outer peripheral edge of the opening 121 in the extended exposed portion 136b. The seal member 128 is located on the radially inner side of the opening 121 with respect to the conducting member 127 when the opening 121 is closed by the door 102, and seals between the surrounding tank 103 and the door 102. In the present embodiment, a silicon rubber tube is used as the seal member 128. Further, a conductive rubber can be used for the seal member 128 itself. In this case, since the enclosure tank 103 and the door 102 are sealed and the invasion / leakage prevention of the radio wave is used, the conducting member 127 is not necessary.
[0045]
  Next, FIG. 4 shows an enlarged view of part B of FIG. As shown in FIG. 4, a radio wave-permeable heat insulating material 113 (urethane foam) is disposed in the radio wave passage hole 110 formed in the first surrounding tank wall portion 132 of the surrounding tank wall 131. Further, outside the radio wave passage hole 110 (on the left side in FIG. 4), an outer window member 141 (a plate material made of polytetrafluoroethylene (trade name: Teflon)) (hereinafter also referred to as a Teflon plate) having radio wave transmission is provided. A member 140 is disposed. Similarly, on the inner side of the radio wave passage hole 110 (the test space 120 side (right side in FIG. 4)), an inner obstruction having a radio wave permeable inner window member 151 (a plate material made of polytetrafluoroethylene (trade name: Teflon)). A member 150 is disposed. For this reason, in the environmental test apparatus 100, radio waves can be transmitted and received between the outside of the environmental test apparatus 100 and the test space 120 through the radio wave passage hole 110.
[0046]
  By the way, the radio wave passage hole 110 is closed by a heat insulating material 113 made of urethane foam having a thickness of 50 mm. For this reason, the movement of heat between the outside of the environmental test apparatus 100 (left side in FIG. 2) and the test space 120 (right side in FIG. 2) can be prevented through the radio wave passage hole 110. The temperature can be set with high accuracy. Further, the radio wave passage hole 110 is closed from the outside by the outer closing member 140 disposed on the outer side (left side in FIG. 4), and similarly, the inner side by the inner blocking member 150 disposed on the inner side (right side in FIG. 4). It is blocked from. Thus, in the environmental test apparatus 100, the radio wave passage hole 110 is closed by the outer closing member 140 and the inner closing member 150 so as to sandwich the heat insulating material 113, and the space surrounded by these is sealed. For this reason, since the interruption | blocking function which interrupts | blocks the environmental condition of the exterior of the environmental test apparatus 100, such as prevention of the movement of the heat between the exterior of the environmental test apparatus 100 and the test space 120, increases, it is more accurate and the inside of the test space 120 The environmental state can be set to a predetermined environmental state. In this embodiment, the heat insulating material 113, the outer closing member 140, and the inner closing member 150 are provided as the blocking means.
[0047]
  Further, the urethane foam constituting the heat insulating material 113 is a material having high radio wave permeability but high hygroscopicity. For this reason, when an environmental test is performed in a humid environment, the heat insulating material 113 absorbs moisture, which causes a decrease or deterioration of the heat insulating property. On the other hand, in the environmental test apparatus 100, the heat insulating material 113 made of urethane foam is disposed in the sealed space by the outer closing member 140 and the inner closing member 150. By doing in this way, even when an environmental test is performed in a humid environment, the heat insulating material 113 made of urethane foam does not absorb moisture and can prevent deterioration or deterioration of the heat insulating property.
[0048]
  The outer closing member 140 includes a rectangular plate-shaped outer window member 141, a first outer window frame member 142 for fixing the outer window member 141 from the outside (left side in FIG. 4) to the first surrounding tank wall 132, and a first outer window frame member 142. The outer window frame member 143 is constituted by two. The outer window member 141 is a Teflon plate having a thickness of 2 mm, and has an outer window 141b included in a virtual projection region M in which the radio wave passage hole 110 is projected in the direction of the axis S as shown in FIG. The first outer window frame member 142 is made of bakelite, has a rectangular cylindrical shape, and an opening end surface 142 b is formed obliquely with respect to the axis S of the radio wave passage hole 110. The second outer window frame member 143 includes four rectangular rod-like bodies 143b, 143c, 143d, and 143e, which are arranged in a rectangular ring shape. The outer closing member 140 is integrally formed by fixing the peripheral edge portion of the outer window member 141 between the first outer window frame member 142 and the second outer window frame member 143. Then, using a through hole (not shown) formed in the first outer window frame member 142, the tapping screw 11 is screwed to the first outer surface 132 b of the first surrounding tank wall portion 132.
[0049]
  Similarly, the inner closing member 150 has a rectangular plate-like inner window member 151 and a first plate for fixing the inner window member 151 from the inner side (test space 120 side (right side in FIG. 4)) to the first surrounding tank wall 132. A first inner window frame member 152 and a second outer window frame member 153 are configured. The inner window member 151 is a Teflon plate having a thickness of 2 mm, and has an inner window portion 151b included in a virtual projection region M in which the radio wave passage hole 110 is projected in the direction of the axis S as shown in FIG. The first inner window frame member 152 is made of bakelite, has a rectangular cylindrical shape, and an opening end surface 152 b is formed obliquely with respect to the axis S of the radio wave passage hole 110. The second inner window frame member 153 includes four rectangular bar-like bodies 153b, 153c, 153d, and 153e, which are arranged in a rectangular ring shape. The inner closing member 150 is integrally formed by fixing the peripheral edge portion of the inner window member 151 between the first inner window frame member 152 and the second inner window frame member 153. Then, using a through hole (not shown) formed in the first inner window frame member 152, the tapping screw 11 is screwed to the first inner side surface 132 c of the first surrounding tank wall portion 132.
[0050]
  Further, as shown in FIG. 4, the inner peripheral surface 110 b of the radio wave passage hole 110 is configured by an inner peripheral surface radio wave absorber layer 111. For this reason, the reflection of the radio wave at the inner peripheral surface 110 b of the radio wave passage hole 110 can be prevented. Therefore, since the environment test apparatus 100 can prevent the radio waves reflected by the inner peripheral surface 110b of the radio wave passage hole 110 from entering the test tank 101 or going outside, it is possible to perform an environmental test that is hardly affected by the reflected radio waves. It becomes. In the present embodiment, a radio wave absorption tile obtained by kneading and firing soil and carbon is used as the inner circumferential radio wave absorber layer 111.
[0051]
  Furthermore, the inner peripheral surface 110b of the radio wave passage hole 110 faces obliquely outward. In other words, the normal vector N of the inner peripheral surface 110 b faces the outside of the environmental test apparatus 100. For this reason, for example, when a radio wave receiver is disposed in the test space 120 as a specimen, the inner peripheral surface 110b is disposed on the side farther from the radio wave passage hole 110 than the virtual inner peripheral surface L extending into the test tank 101. For example, even if a radio wave emitted from the outside is reflected by the inner peripheral surface 110b, it can be prevented from entering the radio wave receiver. In the present embodiment, the angle formed by the normal vector N of the inner peripheral surface 110b and the axis S of the radio wave passage hole 110 is 60 degrees.
[0052]
  Further, in the environmental test apparatus 100, the outer window member 141 is disposed obliquely with respect to the axis S of the radio wave passage hole 110, and the inner window member 151 is also disposed obliquely with respect to the axis S of the radio wave passage hole 110. For example, when a radio wave is emitted from an external radio wave transmitter toward the radio wave receiver in the test chamber 101 along the direction of the axis S of the radio wave passage hole 110, a part of the transmitted radio wave is part of the outer blocking member 140. Alternatively, the light is reflected by the inner closing member 150. However, since the outer window 141 and the inner window 151 are disposed obliquely with respect to the axis S of the radio wave passage hole 110 in the environmental test apparatus 100, it is possible to prevent the reflected radio waves from returning to the radio transmitter. The same applies to the case where radio waves are transmitted from the radio wave transmitter in the test chamber 101 toward the external radio wave receiver along the direction of the axis S of the radio wave passage hole 110. In the present embodiment, the outer window member 141 and the inner window member 151 are arranged in parallel. As shown in FIG. 4, when the radio wave passage hole 110 is viewed from the side, the outer window member 141 and the inner window member 151 The angle formed by the axis S of the radio wave passage hole 110 is 80 degrees.
[0053]
  Next, FIG. 5 shows a cross-sectional side view of the portion C in FIG. As shown in FIG. 5, the temperature sensor 171 protruding into the test space 120 is surrounded by a radio wave shielding member 170 made of a cylindrical metal mesh. For this reason, for example, a problem that erroneous detection of temperature occurs due to radio waves in the test space 120 being superimposed as noise on the output of the temperature sensor 171, or radio waves from outside enter the test space through the temperature sensor 171. Can be prevented. Furthermore, the radio wave shielding member 170 is formed of a metal mesh having a large number of ventilation holes 170b, and therefore has excellent air permeability. For this reason, the temperature inside the radio wave shielding member 170 becomes equal to the temperature inside the test space 120. Therefore, in the environmental test apparatus 100, the temperature in the test space 120 can be accurately detected by the temperature sensor 171. The temperature sensor 171 is inserted through the through hole 131d formed in the surrounding tank wall 131, but this portion is cylindrical so as not to be electrically connected to the outer surrounding tank metal wall plate 134 and the inner surrounding tank metal wall plate 136. It is covered with silicon rubber. Further, the radio wave shielding member 170 is disposed so as to be electrically connected to the inner enclosure tank metal wall plate 136.
  Note that, in the case where a humidity sensor or the like is provided in addition to the temperature sensor 171, it may be covered with the radio wave shielding member 170.
[0054]
  Such an environmental test apparatus 100 of the present embodiment is used for an environmental test of equipment using radio waves, for example, as shown in FIG. Specifically, the radio wave receiver 20 is arranged in the test space 120 of the environmental test apparatus 100, and the radio wave receiver 20 is placed outside the environmental test apparatus 100 at a position facing the radio wave receiver 20 with the radio wave passage hole 110 interposed therebetween. A transmitter 30 is arranged. The radio wave transmitter 30 transmits a radio wave having a predetermined frequency, and the radio wave receiver 20 receives the radio wave. At this time, the temperature characteristic of the radio wave receiver 20 is measured by the control device 105 of the thermostatic device 106 by changing the state of −20 ° C. and 60 ° C. so as to repeat every 30 minutes in the test space 120. .
[0055]
  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above embodiments, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.
  For example, in the environmental test apparatus 100 of the embodiment, the radio wave passage hole 110 is closed by the heat insulating material 113 as shown in FIG. However, for example, as shown in FIG. 7, without providing the heat insulating material 113, the radio wave passage hole 110 is closed by the outer closing member 140 and the inner closing member 150, and the space sandwiched between both members is sealed. May be.
[0056]
  Moreover, in the environmental test apparatus 100 of the embodiment, as shown in FIG. 4, the outer window member 141 of the outer closing member 140 and the inner window member 151 of the inner closing member 150 are arranged in parallel. However, for example, as shown in FIG. 8, the inner closing member 150 is mounted upside down, and the inner window member 151 of the inner closing member 250 is not parallel to the outer window member 141, and the radio wave passage hole 110. You may make it arrange | position diagonally with respect to the axis line S. FIG.
[0057]
  Further, in the environmental test apparatus 100 of the embodiment, as shown in FIG. 4, the outer closing member 140 includes a first outer window frame member 142, a second outer window frame member 143, and a radio wave transmissive outer window member 141. Similarly, the inner closing member 150 is also composed of the first inner window frame member 152, the second inner window frame member 153, and the radio wave transmitting inner window member 151. However, for example, as shown in FIG. 9, the entire outer blocking member 340 and inner blocking member 350 may be formed of a radio wave permeable material. Moreover, you may make it form the whole about either one of an outer side obstruction | occlusion member and an inner side obstruction | occlusion member with a radio wave-permeable material.
[0058]
  Further, in the environmental test apparatus 100 of the embodiment, as shown in FIG. 4, the outer closing member 140 is arranged outside the radio wave passage hole 110 (left side in FIG. 4), and the inner closing member 150 is placed inside the radio wave passage hole 110. (Test space 120 side (right side in FIG. 4)). However, for example, as shown in FIG. 10, the outer blocking member 440 and the inner blocking member 450 may be disposed in the radio wave passage hole 110. At this time, the entire outer blocking member 440 and inner blocking member 450 may be formed of a radio wave transmitting material, for example, a plate material of polytetrafluoroethylene (trade name: Teflon).
[0059]
  In the form shown in FIG. 10, the heat insulating material 413 is disposed in the center of the radio wave passage hole 110, and spaces are provided between the outer closing member 440 and the inner closing member 450. On the other hand, as shown in FIG. 11, the outer closing member 440 and the heat insulating material 513 and the inner closing member 450 and the heat insulating material 513 may be arranged so as to be in contact with each other without a gap.
  Further, in the environmental test apparatus 100 of the embodiment, the entire space surrounded by the outer closing member 140 and the inner closing member 150 may be filled with a heat insulating material.
[Brief description of the drawings]
1A and 1B are views showing an environmental test apparatus 100 according to an embodiment, in which FIG. 1A is a side view thereof, and FIG.
FIG. 2 is a perspective sectional view of the surrounding tank 103 of the environmental test apparatus 100 according to the embodiment.
FIG. 3 is a perspective view of the test tank 101 with the door 102 opened in the environmental test apparatus 100 according to the embodiment.
FIG. 4 is a diagram showing a portion B of FIG. 1, and is a cross-sectional view of the vicinity of the radio wave passage hole 110 of the environmental test apparatus 100 according to the embodiment.
FIG. 5 is a side sectional view of a part C in FIG. 2 and shows the vicinity of a temperature sensor 171 of the environmental test apparatus 100 according to the embodiment.
FIG. 6 is an explanatory diagram illustrating an environmental test using the environmental test apparatus 100 according to the embodiment.
FIG. 7 is a cross-sectional view of the vicinity of a radio wave passage hole 110 of an environmental test apparatus according to another embodiment.
FIG. 8 is a cross-sectional view of the vicinity of a radio wave passage hole 110 of an environmental test apparatus according to another embodiment.
FIG. 9 is a cross-sectional view of the vicinity of a radio wave passage hole 110 of an environmental test apparatus according to another embodiment.
FIG. 10 is a cross-sectional view of the vicinity of a radio wave passage hole 110 of an environmental test apparatus according to another embodiment.
FIG. 11 is a cross-sectional view of the vicinity of a radio wave passage hole 110 of an environmental test apparatus according to another embodiment.
[Explanation of symbols]
100 Environmental test equipment
101 Test tank
102 Door (test chamber wall)
103 Siege Tank
110 Radio wave passage hole
110b Inner peripheral surface of radio wave passage hole
111 Inner circumferential surface electromagnetic wave absorber layer
113,413,513 Thermal insulation (blocking means)
120 test space
121 opening
126 Inside door metal wall plate (door metal wall plate)
126b Opposed exposed part
127 Conducting member
128 Seal member
131 Surrounding tank wall (test tank wall)
134 Outer Enclosure Tank Metal Wall Board (Enclosure Tank Metal Wall Board)
136 Inside Enclosed Tank Metal Wall Board (Enclosed Tank Metal Wall Board)
136b Extended exposed part
137 Wave absorber layer
140,340,440 Outer closing member (blocking means)
141b Outside window
150, 250, 350, 450 Inner closing member (blocking means)
151b Inside window
170 Radio wave shielding member (shielding member)
170b Vent
171 Temperature sensor (environmental sensor)
M Virtual projection area

Claims

An environmental test apparatus having a test tank and capable of setting the temperature of the test space in the test tank,
The test tank is
A test chamber wall surrounding the test space;
A radio wave passage hole formed through the test chamber wall, the radio wave passage hole capable of transmitting and receiving radio waves between the test space and the outside of the environmental test apparatus through the radio wave passage hole;
A blocking means for blocking the influence of the external environmental state through the radio wave passage hole on the environmental state of the test space ,
The blocking means is
Including a radio wave transmissive heat insulating material that closes the radio wave passage hole;
An outer closing member that is located outside the heat insulating material and closes the radio wave passage hole,
Among the outer blocking members, at least a part of the outer window part included in the virtual projection region in which the radio wave passage hole is projected in the axial direction is an outer blocking member made of a radio wave permeable material, and
An inner closing member that is located inside the heat insulating material and closes the radio wave passage hole,
Among the inner blocking members, at least a part of the inner window portion included in the virtual projection region has an inner blocking member made of a radio wave transmitting material,
The space sandwiched between the outer closing member and the inner closing member is sealed,
The outer window portion of the outer blocking member is disposed obliquely with respect to the axis of the radio wave passage hole,
The inner window portion of the inner closure member, Ru environmental tester name are arranged obliquely to the axis of the wave passing hole.

An environmental test apparatus having a test tank and capable of setting the temperature of the test space in the test tank,
The test tank is
A test chamber wall surrounding the test space;
A radio wave passage hole formed through the test chamber wall, the radio wave passage hole capable of transmitting and receiving radio waves between the test space and the outside of the environmental test apparatus through the radio wave passage hole;
A blocking means for blocking the influence of the external environmental state through the radio wave passage hole on the environmental state of the test space,
The blocking means includes an outer blocking member and an inner blocking member that block the radio wave passage hole,
The outer blocking member is positioned outside the inner blocking member, and at least a part of the outer window portion included in the virtual projection area in which the radio wave passage hole is projected in the axial direction of the outer blocking member is a radio wave. Made of transparent material,
The inner closing member is located away from the outer closing member, and at least a part of the inner window portion included in the virtual projection region of the inner closing member is made of a radio wave permeable material.
The space sandwiched between the outer closing member and the inner closing member is sealed,
The outer window portion of the outer blocking member is disposed obliquely with respect to the axis of the radio wave passage hole,
The inner window portion of the inner closure member, Ru environmental tester name are arranged obliquely to the axis of the wave passing hole.

The environmental test apparatus according to claim 1 or 2 , wherein
An environmental test apparatus in which at least a part of the inner surface of the test chamber wall is covered with a radio wave absorber layer.

The environmental test apparatus according to any one of claims 1 to 3 ,
An environmental test apparatus in which an inner peripheral surface of the radio wave passage hole faces at least one of an oblique inner side and an oblique outer side.

The environmental test apparatus according to any one of claims 1 to 4 ,
An environmental test apparatus in which an inner peripheral surface of the radio wave passage hole is covered with an inner peripheral radio wave absorber layer.