JP4137325B2 - Ventilation enclosure - Google Patents

Ventilation enclosure Download PDF

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Publication number
JP4137325B2
JP4137325B2 JP34967999A JP34967999A JP4137325B2 JP 4137325 B2 JP4137325 B2 JP 4137325B2 JP 34967999 A JP34967999 A JP 34967999A JP 34967999 A JP34967999 A JP 34967999A JP 4137325 B2 JP4137325 B2 JP 4137325B2
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Japan
Prior art keywords
casing
opening
ventilation
housing
breathing member
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JP34967999A
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Japanese (ja)
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JP2001168543A (en
Inventor
浩明 益子
弘行 西井
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to JP34967999A priority Critical patent/JP4137325B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、自動車用電子制御装置等の筐体に関するもので、筐体の内外間を通気可能として筐体に内圧調整等の機能を持たせるとともに筐体内部を防水および防油可能ならびに防塵可能とする通気筐体に関するものである。
【0002】
【従来の技術】
従来より、自動車用ヘッドランプ,リアランプ,フォグランプ,ターンランプ,モーター,各種圧力センサー,および圧力スイッチ等の自動車用電装部品、携帯電話、カメラ、電気剃刀、電動歯ブラシならびに屋外用途のランプ等、各種の機器筐体がある。
【0003】
最近では、自動車の室内空間の確保が大きな課題になっており、従来は車室内に設置されていたECU(electronic control unit)と呼ばれる自動車用電子制御装置,CPU(central processing unit),電装品等を収納する機器筐体がエンジンルームやドアパネル内部等の自動車の車室外に移されてきている。車室内と異なり車室外に設置される上記機器筐体は、風雨,泥水,オイル類等の影響を受けないよう密閉状態になっていた。これを図に示す。図において、51は機器筐体である。
【0004】
しかしながら、自動車用電子制御装置等では、それ自体の発熱や車室外設置にもとづく温度差による圧力変動等の影響を小さくする目的で上記機器筐体51に通気キャップを設けることが行なわれつつある。これは、つぎのように構成されている。すなわち、上記機器筐体51にその内外間を連通する開口部を設け、この開口部に通気キャップを取り付けるという構成になっている。これにより、機器筐体内部に水や塵埃等が侵入するのを防止した状態で、温度変化による機器筐体内の圧力の変化の緩和や、機器筐体内部に発生したガスの放出が可能となる。
【0005】
その一例を図に示す。この例は、自動車用電装部品等を収納する機器筐体であり、筐体61に首状の開口部62が形成され、この開口部62にL字状通気キャップ63の一端が嵌合されている。これにより、開口部62の防水性等が確保されたうえで、機器筐体内外の通気性が得られる。
【0006】
【発明が解決しようとする課題】
しかしながら、このような構造体にはつぎのような問題がある。すなわち、上記図に示すものにおいて、防塵性や防水性等を確保するためには、通気キャップ63を長くしたり、通気キャップ63の内部を迷路構造にしたりする必要がある。通気キャップ63を長くすると、通気キャップ63の取り付けスペースが大きくなるとともに通気キャップ63の価格が高くなる。その結果、機器筐体が大きくなるとともに機器筐体の価格が高くなるという問題がある。また、通気キャップ63の内部を迷路構造にすると、通気キャップ63が複雑化するため、通気キャップ63の価格が高くなる。その結果、機器筐体の価格が高くなるという問題がある。さらに、上記通気キャップ63を嵌着した機器筐体では、微細な腐食性塵埃の侵入を防ぐことができないという問題がある。
【0007】
本発明は、このような事情に鑑みなされたもので、コンパクトかつ低価格であるとともに防塵性,防水性および防油性が高い通気筐体の提供をその目的とする。
【0008】
【課題を解決するための手段】
上記の目的を達成するため、本発明の通気筐体は、筐体の周壁に開口部が設けられ、この開口部に、呼吸部材と補強材とが、開口部を被覆した状態で取り付けられている通気筐体であって、上記補強材の周縁部が上記開口部の周囲部に熱融着または超音波溶着され、この状態の補強材に、上記呼吸部材が、その補強材を介して、上記開口部を被覆した状態で積層され、上記補強材に部分的な接着または融着により一体化しており、上記呼吸部材の表面全体が、筐体の外部の大気中に露出しているという構成をとる。
【0009】
すなわち、本発明の通気筐体は、筐体の周壁に開口部が設けられ、この開口部に、呼吸部材が、補強材を介して、開口部を被覆した状態で熱融着または超音波溶着されて取り付けられているため、通気筐体がコンパクトになるとともに、通気筐体の防塵性,防水性および防油性を容易に高めることができる。したがって、通気筐体の低価格化が容易となる。なお、本発明において、「呼吸部材」とは、通気筐体の内外に圧力差が生じた場合に、通気および透湿が可能となる部材を意味するものである。
【0010】
つぎに、本発明を詳しく説明する。
【0011】
本発明の通気筐体は、筐体の周壁に設けられた開口部に、呼吸部材が補強材を介して熱融着または超音波溶着されて取り付けられているものである。
【0012】
上記呼吸部材の構成材料としては、例えば、ポリテトラフルオロエチレン(PTFE)樹脂製多孔体,ポリオレフィン樹脂(ポリエチレン,ポリプロピレン等)製多孔体があげられる。これらの材料を用い呼吸部材を構成する場合には、全体を上記多孔体で構成してもよいし、その一部を上記多孔体で構成してもよい。後者の場合は、通常、他の合成樹脂材料等との複合体となる。
【0013】
上記呼吸部材に上記多孔体を用いた場合には、その気孔率が50〜99%の範囲であることが好ましい。上記気孔率が50%を下回ると、筐体内外の差圧を調整する際に圧力損失が大きくなるからである。
【0014】
また、上記多孔体の各孔径は、0.01〜10μmの範囲であることが好ましい。上記孔径が0.01μmを下回ると、上記圧力損失が大きくなり易く、10μmを上回ると、防塵性が低下するおそれがあるからである。
【0015】
また、上記多孔体の厚みは、2μm以上であることが好ましい。上記厚みが2μmを下回ると、呼吸部材の強度が弱くなり、筐体に圧接しにくくなるからである。
【0016】
【発明の実施の形態】
つぎに、本発明の実施の形態を図面にもとづいて詳しく説明する。
【0017】
図1および図2は、本発明の通気筐体の第1の実施の形態を示している。この実施の形態では、通気筐体は、中空円柱状の筐体1の頂面に円形の開口部2を設け、この開口部2に、補強材4を介して呼吸部材3を取着して構成されている。なお、図示を省略したが、筐体1の内部にはECU,CPU等が収納されている。
【0018】
より詳しく説明すると、上記呼吸部材3は合成樹脂製の多孔体からなる膜材であり、通気性を有している。また、必要に応じて、上記呼吸部材3には、撥水処理および/または撥油処理が施される。この撥水処理,撥油処理は、表面張力の小さな物質を塗布し、乾燥後、キュアすることにより行なわれる。
【0019】
上記補強材4は、織布,不織布,混紡不織布,フェルト,ネット,粉末燒結多孔質体または発泡体等の通気性材料からなる。そして、この補強材4は、呼吸部材3の片面に積層されて呼吸部材3を補強している。補強材4の材質は、天然素材あるいは合成素材のいずれでもよいが、耐熱性を望む場合は、ポリエステル樹脂,ポリアミド樹脂,アラミド樹脂,ポリイミド樹脂,フッ素樹脂,超高分子量ポリエチレン樹脂,金属等から形成するのが好ましい
【0020】
上記通気筐体は、例えば、つぎのようにして作製される。すなわち、まず、上記呼吸部材3と補強材4とを接着,融着等の適宜の手段により積層し、シート状の積層体5を形成する。この呼吸部材3と補強材4との積層は、得られる積層体5の通気性を確保するように行なう。例えば、積層手段として接着を採用するときは、呼吸部材3と補強材4とを点状,筋状,網目状等の形状に部分接着し、また、融着を採用するときは、加熱温度や加圧時間を調整する。このようにして、通気性を有する積層体5を得たのち、筐体1の頂面の開口部2を被覆するように積層体5を取り付ける。この積層体5の筐体1の開口部2への取り付けは、熱融着等を採用できる。
【0021】
このように、上記実施の形態の通気筐体によれば、シート状の積層体5が筐体1の開口部2を被覆した状態で被覆されているため、積層体5の取り付けスペースが大きくならない。したがって、通気筐体を筐体1と殆ど変わらないコンパクトな大きさとすることができる。
【0022】
また、上記通気筐体は、筐体1の開口部2が上記呼吸部材(多孔体からなる膜材)3で被覆されているため、防塵性,防水性および防油性が高い。さらに、上記呼吸部材3も補強材4も通気性を有しているため、上記通気筐体内のECU等の発熱等により通気筐体内外で圧力差が生じても、通気筐体は、その内部圧力の変化を緩和することができる。しかも、上記呼吸部材3に撥水処理,撥油処理が施されていると、上記通気筐体は、防水性,防油性が一層向上する。
【0023】
さらに、上記通気筐体は、容易な構造により防塵性,防水性および防油性を高めることができるため、通気筐体の低価格化が容易となる。
【0024】
および図は、本発明の通気筐体の第の実施の形態を示している。この実施の形態では、通気筐体は、中空円柱状の筐体21の頂面に断面円形の首状の開口部22を設け、この開口部22に、呼吸部材23と補強材24との積層体25が上端(一端)開口部に被覆された有天筒状体(略筒状体)26を嵌合して構成されている。そして、上記有天筒状体26の弾性率は、筐体21の弾性率よりも小さくなっている。なお、上記呼吸部材23および補強材24は、上記第1の実施の形態のものと同様の作用を有するものである。
【0025】
上記通気筐体は、例えばつぎのようにして作製される。すなわち、まず、熱可塑性樹脂製の筒状体27を準備する。ついで、第1の実施の形態と同様にして、呼吸部材23と補強材24とからなるシート状の積層体25を熱融着等により形成する。つぎに、上記積層体25の補強材24を上記筒状体27の上端開口部に当接させて積層体25と筒状体27とを熱融着等することにより、有天筒状体26を形成する。そののち、上記有天筒状体26を上記筐体21の開口部22に嵌合する。このようにして、上記通気筐体が作製される。
【0026】
このような第の実施の形態の通気筐体によっても、上記第1の実施の形態と同様の作用・効果を奏する。
【0027】
また、上記有天筒状体26の弾性率が筐体21の弾性率よりも小さいため、筐体21からの有天筒状体26の引き抜き強度が大きく、有天筒状体26の脱落という不都合を生じ難い。ただし、引き抜き強度の多少の低下が許容される場合は、有天筒状体26の弾性率を筐体21の弾性率よりも大きくすることができる。なお、弾性率の小さい材料としては、ゴム系樹脂,エラストマー系樹脂等が好ましい。
【0028】
および図は、本発明の通気筐体の第の実施の形態を示している。この実施の形態では、通気筐体は、中空円柱状の筐体31の頂面に段部32aを有する円形の開口部32を設け、この開口部32に、呼吸部材33と補強材34との積層体35が底部貫通孔(開口部)36に被覆された略筒状体37を熱融着して構成されている。なお、上記呼吸部材33および補強材34は、上記第1の実施の形態のものと同様の作用を有するものである。
【0029】
より詳しく説明すると、上記筐体31の開口部32は、2段に形成されており、下側部分(筐体の内側部分)が上記略筒状体37よりも小径の段部32aに形成され、上側部分(筐体の外側部分)が上記略筒状体37と同径に形成されている。
【0030】
上記略筒状体37は、底部に貫通孔36が形成された熱可塑性樹脂製の有底筒状体38と、この有底筒状体38の底面に熱融着させた上記積層体35とからなり、胴部の内径が上記積層体35と同径に形成されている。
【0031】
上記通気筐体は、例えばつぎのようにして作製される。すなわち、まず、第1の実施の形態と同様にして、呼吸部材33と補強材34とからなるシート状の積層体35を熱融着等により形成する。ついで、上記積層体35の補強材34を下側(上記有底筒状体の底側)にして積層体35を有底筒状体38の上端開口部から挿入する。つぎに、上記有底筒状体38の底面に積層体35の補強材34を当接させて積層体35と有底筒状体38とを熱融着等することにより、略筒状体37を形成する。つぎに、上記略筒状体37を底部から上記筐体31の開口部32の上側部分に挿入して上記段部32aで支受する。そののち、略筒状体37と筐体31の開口部32とを熱融着等する。このようにして、上記通気筐体が作製される。
【0032】
このような第の実施の形態の通気筐体によっても、上記第1の実施の形態と同様の作用・効果を奏する。
【0033】
なお、上記各実施の形態では、呼吸部材3,23,33を筐体1,21,31の頂面に1箇所設けた場合について説明したが、これに限定されるものではなく、筐体1,21,31の他の面や内側の面に設けてもよいし、複数箇所設けてもよい
【0034】
また、上記各実施の形態では、呼吸部材3,23,33と補強材4,24,34とを熱融着させたが、超音波溶着でもよい。また、上記第の実施の形態における略筒状体37と筐体31との熱融着も超音波溶着で行なってもよい。
【0035】
つぎに、実施例について比較例と併せて説明する。
【0036】
【実施例1】
実施例1品は、図1および図2に示す通気筐体である。そこで、筐体1を、テイジン社製CG7640(ポリブチレンテレフタレート樹脂:融点225℃)を用いて射出成形により作製した。得られた筐体1の開口部2の内径は6mmであった。また、呼吸部材3として、日東電工社製ミクロテックスNTF1131(ポリテトラフルオロエチレン樹脂製の多孔質膜:融点327℃)を準備し、撥水処理および撥油処理を施した。すなわち、まず、アルキルメタクリレート40モル%とパーフルオロアルキルメタクリレート60モル%とからなるコポリマー、およびトルエン100重量部にn−ヘプタン39重量部と酢酸メチル3.5重量部とを均一に混合した溶媒を準備した。ついで、この溶媒に上記コポリマーを溶解し、固形分5重量%の撥水撥油剤溶液を作製した。つぎに、この撥水撥油剤溶液を上記呼吸部材3に塗布し、80℃で10分間乾燥したのち、180℃で3分間キュアーした。このようにして呼吸部材3に撥水処理および撥油処理を施した。そして、得られた呼吸部材3の厚みは0.085mm,外径は10mmであった。また、補強材4として、厚み0.15mmの東レ社製アクスターG−2070−1S(不織布:表層融点260℃)を準備し、その片面に文字を印刷した。そして、上記呼吸部材3と補強材4とを、温度260℃,圧力4.9×105 Paで10秒間圧着して熱融着し、呼吸部材3と補強材4との積層体5を得た。つづいて、上記筐体1の開口部2を被覆するように、上記積層体5の補強材4を筐体1に当接させ、温度260℃,圧力4.9×105 Paで30秒間圧着して熱融着し、図1および図2に示す通気筐体を得た。
【0037】
このようにして得られた通気筐体について、耐水圧試験,防塵性試験および加熱・冷却試験を下記の方法に従って行なった。その結果、水の浸入,塵埃の侵入および通気筐体の破損はなかった。
【0038】
〔耐水圧試験〕
通気筐体を水の入った加圧容器中に入れ、水により9.8×104 Paの圧力を10分間かけたのち、常圧に戻し、加圧容器から取り出す。そして、通気筐体内への水の浸入を目視にて確認する。
【0039】
〔防塵性試験〕
10リットルの容器中に試験用ダスト8号(関東ローム社製)200gと通気筐体とを入れ、上記10リットルの容器を10回転/分の速度で10分間回転させたのち、上記10リットルの容器から通気筐体を取り出す。そして、通気筐体内へのダストの侵入を目視にて確認する。
【0040】
〔加熱・冷却試験〕
通気筐体を、25℃雰囲気中に24時間放置したのち、105℃の乾燥機中に30分間放置し、つづいて0℃の冷却機中に30分間放置するという1サイクルの操作を24サイクル行なったのち、通気筐体の破損および亀裂を目視にて確認する。
【0041】
【実施例
実施例品は、図および図に示す通気筐体である。そこで、筐体21を、住友化学工業社製AW564(ポリプロピレン樹脂:曲げ弾性率1.35×109 N/m2 )を用いて射出成形により作製した。得られた筐体21の開口部22の首部の外径は8mm、内径は6mm、高さは15mmであった。また、呼吸部材23および補強材24は、実施例1と同様のものであり、実施例1と同様にして呼吸部材23と補強材24との積層体25を得た。また、筒状体27を、三井化学社製ミラストマー6030(熱可塑性エラストマー:曲げ弾性率4.41×108 N/m2 )を用いて射出成形により作製した。得られた筒状体27の外径は12mm、内径は7.5mm、高さは12mmであった。そして、上記筒状体27の上端開口部に積層体25の補強材24を当接させ、呼吸部材23側から温度150℃,圧力4.9×105 Paで10秒間圧着して熱融着し、有天筒状体26を得た。つづいて、上記有天筒状体26を底部から上記筐体21の開口部22の首部に嵌合させ、図および図に示す通気筐体を得た。
【0042】
このようにして得られた通気筐体について、実施例1と同様にして、耐水圧試験,防塵性試験および加熱・冷却試験を行なった。その結果、水の浸入,塵埃の侵入および通気筐体の破損はなかった。
【0043】
【実施例
実施例品は、図および図に示す通気筐体である。そこで、筐体31を、住友化学工業社製AW564(ポリプロピレン樹脂:曲げ弾性率1.35×109 N/m2 :融点170℃)を用いて射出成形により作製した。得られた筐体31の開口部32の内径は、上側部分が14mm、下側部分が6mmであった。また、呼吸部材33および補強材34は、実施例1と同様のものであり、実施例1と同様にして呼吸部材33と補強材34との積層体35を得た。また、底部に貫通孔36が形成された有底筒状体38を、上記筐体31と同様の材料を用いて射出成形により作製した。得られた有底筒状体38の高さは5mm,胴部の内径は8mm、底部貫通孔36の内径は5mmであった。そして、上記積層体35の補強材34を下側(上記有底筒状体の底側)にして積層体35を有底筒状体38の上端開口部から挿入する。つぎに、上記有底筒状体38の底面に積層体35の補強材34を当接させ、呼吸部材33側から温度160℃,圧力4.9×105 Paで10秒間圧着して熱融着し、略筒状体37を得た。つづいて、上記略筒状体37を底部から上記筐体31の開口部32の上側部分に挿入したのち、温度170℃,圧力4.9×105 Paで10秒間圧着して熱融着し、図および図に示す通気筐体を得た。
【0044】
このようにして得られた通気筐体について、実施例1と同様にして、耐水圧試験,防塵性試験および加熱・冷却試験を行なった。その結果、水の浸入,塵埃の侵入および通気筐体の破損はなかった。
【0045】
【比較例1】
比較例1品は、図に示す機器筐体51である。そこで、その機器筐体51を、テイジン社製CG7640(ポリブチレンテレフタレート樹脂:融点225℃)を用いて射出成形により作製した。
【0046】
このようにして得られた機器筐体51について、実施例1と同様にして、耐水圧試験,防塵性試験および加熱・冷却試験を行なった。その結果、水の浸入,塵埃の侵入はなかったが、機器筐体51の破損が確認された。
【0047】
【比較例2】
比較例2品は、図に示す機器筐体である。そこで、その筐体61を、テイジン社製CG7640(ポリブチレンテレフタレート樹脂)を用いて射出成形により作製した。得られた筐体61の開口部62の内径は6mm、外径は8mm、高さは15mmであった。また、通気キャップ63を、三井化学社製ミラストマー6030(熱可塑性エラストマー)を用いて射出成形により作製した。得られた通気キャップ63の内径は7.5mm、外径は9mm、高さHは30mm、長さLは40mmであった。
【0048】
このようにして得られた機器筐体について、実施例1と同様にして、耐水圧試験,防塵性試験および加熱・冷却試験を行なった。その結果、水の浸入,塵埃の侵入が確認されたが、機器筐体の破損はなかった。
【0049】
【発明の効果】
以上のように、本発明の通気筐体によれば、筐体の周壁に開口部が設けられ、この開口部に、呼吸部材が開口部を被覆した状態で取り付けられているため、通気筐体がコンパクトになるとともに、通気筐体の防塵性,防水性および防油性を容易に高めることができる。したがって、通気筐体の低価格化が容易となる。
【図面の簡単な説明】
【図1】 本発明の通気筐体の第1の実施の形態を示す説明図である。
【図2】 上記通気筐体を示す説明図である。
【図3】 本発明の通気筐体の第2の実施の形態を示す説明図である。
【図4】 上記通気筐体を示す説明図である。
【図5】 本発明の通気筐体の第3の実施の形態を示す説明図である。
【図6】 上記通気筐体を示す説明図である。
【図】 従来の機器筐体を示す説明図である。
【図】 従来の他の機器筐体を示す説明図である。
【符号の説明】
1 筐体
2 開口部
3 呼吸部材
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a housing of an electronic control device for automobiles, etc., and allows the inside and outside of the housing to be ventilated so that the housing has functions such as internal pressure adjustment, and the inside of the housing can be waterproofed and oilproofed and dustproofed. It relates to a ventilation casing.
[0002]
[Prior art]
Conventionally, various automotive parts such as automotive headlamps, rear lamps, fog lamps, turn lamps, motors, various pressure sensors, and pressure switches, mobile phones, cameras, electric razors, electric toothbrushes, outdoor use lamps, etc. There is a device housing.
[0003]
Recently, securing an interior space of an automobile has become a major issue. Conventionally, an electronic control unit for an automobile called an ECU (electronic control unit), a CPU (central processing unit), an electrical component, etc. The housing of the equipment has been moved to the outside of the vehicle compartment such as the engine room and the door panel. Unlike the vehicle interior, the equipment casing installed outside the vehicle interior is hermetically sealed so as not to be affected by wind and rain, muddy water, oils, and the like. This is shown in Figure 7. In the figure, 51 is a device housing.
[0004]
However, in the electronic control device for automobiles and the like, a ventilation cap is being provided in the device casing 51 for the purpose of reducing the influence of the pressure fluctuation due to the temperature difference caused by the heat generation of the vehicle itself or the installation outside the vehicle compartment. This is configured as follows. In other words, the device casing 51 is provided with an opening communicating between the inside and the outside, and a ventilation cap is attached to the opening. This makes it possible to mitigate changes in pressure in the device casing due to temperature changes and release gas generated in the device casing while preventing water and dust from entering the inside of the device casing. .
[0005]
An example thereof is shown in FIG. This example is a device housing that houses electrical components for automobiles, etc., and a neck-shaped opening 62 is formed in the housing 61, and one end of an L-shaped ventilation cap 63 is fitted into the opening 62. Yes. Thereby, after the waterproofness etc. of the opening part 62 are ensured, the air permeability inside and outside an apparatus housing | casing is obtained.
[0006]
[Problems to be solved by the invention]
However, such a structure has the following problems. That is, in those shown in FIG. 8, in order to ensure dust resistance and a waterproof property or the like, or by increasing the ventilation cap 63, it is necessary or the inside of the vent cap 63 to the labyrinth structure. When the ventilation cap 63 is lengthened, the mounting space for the ventilation cap 63 is increased and the price of the ventilation cap 63 is increased. As a result, there is a problem that the device casing becomes large and the price of the device casing increases. Further, if the inside of the ventilation cap 63 has a labyrinth structure, the ventilation cap 63 becomes complicated, so the price of the ventilation cap 63 increases. As a result, there is a problem that the price of the device casing becomes high. Furthermore, in the equipment housing in which the ventilation cap 63 is fitted, there is a problem in that fine corrosive dust cannot be prevented from entering.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a ventilated casing that is compact and inexpensive and has high dustproof, waterproof, and oilproof properties.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the ventilation casing of the present invention is provided with an opening in the peripheral wall of the casing, and a breathing member and a reinforcing material are attached to the opening so as to cover the opening. The peripheral portion of the reinforcing member is heat-sealed or ultrasonically welded to the peripheral portion of the opening , and the breathing member is attached to the reinforcing member in this state via the reinforcing member. A structure in which the opening is covered and laminated, integrated with the reinforcing member by partial adhesion or fusion, and the entire surface of the breathing member is exposed to the atmosphere outside the housing. Take.
[0009]
That is, the ventilation casing of the present invention is provided with an opening in the peripheral wall of the casing, and in this opening, a breathing member covers the opening with a reinforcing material, and is heat-sealed or ultrasonically welded. because it is attached is, together with the vent housing can be made compact, dust-proof ventilation housing can be easily enhanced waterproof and proof oil. Therefore, it is easy to reduce the price of the ventilation casing. In the present invention, the “breathing member” means a member that allows ventilation and moisture permeation when a pressure difference occurs inside and outside the ventilation housing.
[0010]
Next, the present invention will be described in detail.
[0011]
The ventilation casing according to the present invention is such that a breathing member is attached to an opening provided in a peripheral wall of the casing by heat fusion or ultrasonic welding via a reinforcing material .
[0012]
Examples of the constituent material of the breathing member include a porous body made of polytetrafluoroethylene (PTFE) resin and a porous body made of polyolefin resin (polyethylene, polypropylene, etc.). When the breathing member is constituted using these materials, the whole may be constituted by the porous body, or a part thereof may be constituted by the porous body. In the latter case, it is usually a composite with another synthetic resin material or the like.
[0013]
When the porous body is used for the breathing member, the porosity is preferably in the range of 50 to 99%. This is because, when the porosity is less than 50%, the pressure loss increases when the pressure difference inside and outside the casing is adjusted.
[0014]
Moreover, it is preferable that each pore diameter of the said porous body is the range of 0.01-10 micrometers. This is because if the pore diameter is less than 0.01 μm, the pressure loss tends to increase, and if it exceeds 10 μm, the dust resistance may be reduced.
[0015]
Moreover, it is preferable that the thickness of the said porous body is 2 micrometers or more. This is because, when the thickness is less than 2 μm, the strength of the breathing member becomes weak and it is difficult to press the casing.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
1 and 2 show a first embodiment of a vented housing according to the present invention. In this embodiment, the ventilation casing is provided with a circular opening 2 on the top surface of a hollow cylindrical casing 1, and a breathing member 3 is attached to the opening 2 via a reinforcing material 4. It is configured. Although not shown, an ECU, a CPU, and the like are housed inside the housing 1.
[0018]
More specifically, the breathing member 3 is a membrane material made of a synthetic resin porous body and has air permeability. Further, as necessary, the breathing member 3 is subjected to water repellent treatment and / or oil repellent treatment. This water-repellent treatment and oil-repellent treatment are performed by applying a substance with a small surface tension, drying and curing.
[0019]
The reinforcing material 4 is made of a breathable material such as a woven fabric, a nonwoven fabric, a blended nonwoven fabric, a felt, a net, a powder sintered porous body, or a foamed body. The reinforcing member 4 is laminated on one side of the breathing member 3 to reinforce the breathing member 3. The material of the reinforcing material 4 may be either a natural material or a synthetic material, but if heat resistance is desired, it is formed from polyester resin, polyamide resin, aramid resin, polyimide resin, fluorine resin, ultrahigh molecular weight polyethylene resin, metal, etc. It is preferable to do this .
[0020]
For example, the ventilation casing is manufactured as follows. That is, first, the breathing member 3 and the reinforcing material 4 are laminated by an appropriate means such as adhesion and fusion to form a sheet-like laminate 5. The breathing member 3 and the reinforcing member 4 are laminated so as to ensure the air permeability of the obtained laminated body 5. For example, when bonding is used as the laminating means, the breathing member 3 and the reinforcing material 4 are partially bonded in a dot-like, streaky, or net-like shape, and when using fusion, the heating temperature or Adjust the pressurization time. Thus, after obtaining the laminated body 5 which has air permeability, the laminated body 5 is attached so that the opening part 2 of the top surface of the housing | casing 1 may be coat | covered. Mounting of the opening 2 of the housing 1 of the laminate 5 may employ a heat fusion or the like.
[0021]
As described above, according to the ventilated casing of the above-described embodiment, the sheet-like laminate 5 is covered in a state of covering the opening 2 of the casing 1, so that the mounting space for the laminate 5 does not increase. . Therefore, it is possible to make the vented housing a compact size that is almost the same as the housing 1.
[0022]
Moreover, since the opening part 2 of the housing | casing 1 is coat | covered with the said breathing member (film | membrane material which consists of porous bodies) 3, the said ventilation | gas_flowing housing | casing has high dustproofness, waterproofness, and oilproofness. Further, since both the breathing member 3 and the reinforcing member 4 have air permeability, even if a pressure difference occurs inside and outside the ventilation housing due to heat generated by the ECU or the like in the ventilation housing, The change in pressure can be reduced. In addition, when the breathing member 3 is subjected to water repellency treatment and oil repellency treatment, the ventilation casing is further improved in waterproofness and oilproofness.
[0023]
Furthermore, since the ventilation casing can be improved in dust resistance, waterproofness and oil resistance due to its easy structure, the price of the ventilation casing can be easily reduced.
[0024]
3 and 4 show a second embodiment of the ventilation housing of the present invention. In this embodiment, the ventilation casing is provided with a neck-shaped opening 22 having a circular cross section on the top surface of a hollow cylindrical casing 21, and the opening 22 is laminated with a breathing member 23 and a reinforcing material 24. The body 25 is configured by fitting a dome-shaped cylindrical body (substantially cylindrical body) 26 covered with an upper end (one end) opening. And the elastic modulus of the above-mentioned dome-shaped cylindrical body 26 is smaller than the elastic modulus of the housing 21. The breathing member 23 and the reinforcing member 24 have the same function as that of the first embodiment.
[0025]
For example, the ventilation casing is manufactured as follows. That is, first, a cylindrical body 27 made of a thermoplastic resin is prepared. Next, as in the first embodiment, a sheet-like laminate 25 composed of the breathing member 23 and the reinforcing member 24 is formed by heat fusion or the like. Next, the reinforcing member 24 of the laminated body 25 is brought into contact with the upper end opening of the cylindrical body 27 so that the laminated body 25 and the cylindrical body 27 are heat-sealed, etc. Form. After that, the above-described dome-shaped cylindrical body 26 is fitted into the opening 22 of the casing 21. In this way, the ventilation casing is manufactured.
[0026]
The ventilating casing of the second embodiment as described above also provides the same operations and effects as those of the first embodiment.
[0027]
In addition, since the elastic modulus of the celestial tubular body 26 is smaller than the elastic modulus of the housing 21, the pulling strength of the heavenly tubular body 26 from the housing 21 is large, and the celestial tubular body 26 is dropped off. Inconvenient. However, when a slight decrease in the pull-out strength is allowed, the elastic modulus of the ceiling-like cylindrical body 26 can be made larger than the elastic modulus of the housing 21. In addition, as a material with a small elastic modulus, a rubber-type resin, an elastomer-type resin, etc. are preferable.
[0028]
5 and 6 show a third embodiment of the ventilation casing of the present invention. In this embodiment, the ventilation casing is provided with a circular opening 32 having a step portion 32 a on the top surface of a hollow cylindrical casing 31, and the breathing member 33 and the reinforcing material 34 are provided in the opening 32. The laminated body 35 is configured by heat-sealing a substantially cylindrical body 37 covered with a bottom through hole (opening) 36. The breathing member 33 and the reinforcing member 34 have the same function as that of the first embodiment.
[0029]
More specifically, the opening 32 of the housing 31 is formed in two steps, and the lower portion (inner portion of the housing) is formed in a step 32 a having a smaller diameter than the substantially cylindrical body 37. The upper part (outer part of the housing) is formed to have the same diameter as the substantially cylindrical body 37.
[0030]
The substantially cylindrical body 37 includes a bottomed cylindrical body 38 made of a thermoplastic resin having a through-hole 36 formed at the bottom, and the laminated body 35 thermally bonded to the bottom surface of the bottomed cylindrical body 38. And the inner diameter of the body portion is formed to be the same as that of the laminate 35.
[0031]
For example, the ventilation casing is manufactured as follows. That is, first, similarly to the first embodiment, a sheet-like laminate 35 composed of the breathing member 33 and the reinforcing member 34 is formed by heat fusion or the like. Next, the laminated body 35 is inserted from the upper end opening of the bottomed tubular body 38 with the reinforcing member 34 of the laminated body 35 facing down (the bottom side of the bottomed tubular body). Next, the reinforcing member 34 of the laminated body 35 is brought into contact with the bottom surface of the bottomed cylindrical body 38 so that the laminated body 35 and the bottomed cylindrical body 38 are heat-sealed or the like, whereby a substantially cylindrical body 37 is obtained. Form. Next, the said substantially cylindrical body 37 is inserted in the upper part of the opening part 32 of the said housing | casing 31 from a bottom part, and is supported by the said step part 32a. After that, the substantially cylindrical body 37 and the opening 32 of the housing 31 are heat-sealed. In this way, the ventilation casing is manufactured.
[0032]
The ventilating casing of the third embodiment also has the same operations and effects as the first embodiment.
[0033]
In each of the above-described embodiments, the case where the breathing members 3 , 2 3 , 33 are provided at one place on the top surfaces of the housings 1 , 2 1 , 31 has been described, but the present invention is not limited to this. It may be provided on the other surface or the inner surface of the bodies 1 , 2 1 , 31, or a plurality of locations .
[0034]
In each of the above embodiments, the breathing members 3 , 23 , 33 and the reinforcing members 4 , 24 , 34 are heat-sealed, but ultrasonic welding may be used. In addition, the substantially cylindrical body 37 and the housing 31 in the third embodiment may be heat-sealed by ultrasonic welding.
[0035]
Next, examples will be described together with comparative examples.
[0036]
[Example 1]
The product of Example 1 is the ventilation casing shown in FIGS. 1 and 2. Therefore, the casing 1 was produced by injection molding using CG7640 (polybutylene terephthalate resin: melting point 225 ° C.) manufactured by Teijin. The inner diameter of the opening 2 of the obtained casing 1 was 6 mm. Further, as a breathing member 3, Microtex NTF1131 (polytetrafluoroethylene resin porous film: melting point 327 ° C.) manufactured by Nitto Denko Corporation was prepared and subjected to water repellent treatment and oil repellent treatment. That is, first, a copolymer composed of 40 mol% alkyl methacrylate and 60 mol% perfluoroalkyl methacrylate, and a solvent in which 39 parts by weight of n-heptane and 3.5 parts by weight of methyl acetate were uniformly mixed with 100 parts by weight of toluene. Got ready. Next, the copolymer was dissolved in this solvent to prepare a water / oil repellent solution having a solid content of 5% by weight. Next, this water / oil repellent solution was applied to the breathing member 3, dried at 80 ° C. for 10 minutes, and then cured at 180 ° C. for 3 minutes. In this way, the breathing member 3 was subjected to water repellency treatment and oil repellency treatment. And the thickness of the obtained respiratory member 3 was 0.085 mm, and the outer diameter was 10 mm. Moreover, as a reinforcing material 4, 0.15 mm thick Axter G-2070-1S (nonwoven fabric: surface melting point 260 ° C.) manufactured by Toray Industries, Inc. was prepared, and characters were printed on one side thereof. Then, the breathing member 3 and the reinforcing material 4 are pressure-bonded at a temperature of 260 ° C. and a pressure of 4.9 × 10 5 Pa for 10 seconds and thermally fused to obtain a laminate 5 of the breathing member 3 and the reinforcing material 4. It was. Subsequently, the reinforcing material 4 of the laminated body 5 is brought into contact with the housing 1 so as to cover the opening 2 of the housing 1, and pressure-bonded at a temperature of 260 ° C. and a pressure of 4.9 × 10 5 Pa for 30 seconds. Then, heat-sealing was performed to obtain a ventilation casing shown in FIGS.
[0037]
The ventilated casing thus obtained was subjected to a water pressure test, a dustproof test, and a heating / cooling test according to the following methods. As a result, there was no water intrusion, dust intrusion, and damage to the ventilation casing.
[0038]
(Water pressure test)
The ventilation casing is put in a pressurized container containing water, and after applying a pressure of 9.8 × 10 4 Pa with water for 10 minutes, the pressure is returned to normal pressure and taken out from the pressurized container. Then, the invasion of water into the ventilation casing is visually confirmed.
[0039]
[Dust-proof test]
In a 10 liter container, 200 g of test dust No. 8 (manufactured by Kanto Loam Co., Ltd.) and a ventilation case were put, and the 10 liter container was rotated at a speed of 10 revolutions / minute for 10 minutes, Remove the vented housing from the container. And the penetration | invasion of the dust in a ventilation housing | casing is confirmed visually.
[0040]
[Heating / cooling test]
The ventilation case is left in an atmosphere at 25 ° C. for 24 hours, then left in a dryer at 105 ° C. for 30 minutes, and then left in a cooler at 0 ° C. for 30 minutes. After that, visually check for damage and cracks in the vented housing.
[0041]
[Example 2 ]
EXAMPLE 2 hose of a ventilation housing shown in FIGS. Then, the housing | casing 21 was produced by injection molding using Sumitomo Chemical Co., Ltd. AW564 (polypropylene resin: bending elastic modulus 1.35 * 10 < 9 > N / m < 2 >). The outer diameter of the neck portion of the opening 22 of the obtained casing 21 was 8 mm, the inner diameter was 6 mm, and the height was 15 mm. Further, the breathing member 23 and the reinforcing material 24 are the same as those in Example 1, and a laminate 25 of the breathing member 23 and the reinforcing material 24 was obtained in the same manner as in Example 1. In addition, the cylindrical body 27 was produced by injection molding using Miralastomer 6030 (thermoplastic elastomer: flexural modulus 4.41 × 10 8 N / m 2 ) manufactured by Mitsui Chemicals. The cylindrical body 27 obtained had an outer diameter of 12 mm, an inner diameter of 7.5 mm, and a height of 12 mm. Then, the reinforcing member 24 of the laminated body 25 is brought into contact with the upper end opening of the cylindrical body 27, and pressure bonding is performed from the breathing member 23 side at a temperature of 150 ° C. and a pressure of 4.9 × 10 5 Pa for 10 seconds. As a result, the cylindrical body 26 was obtained. Subsequently, the dome-shaped cylindrical body 26 was fitted from the bottom to the neck of the opening 22 of the casing 21 to obtain the ventilation casing shown in FIGS. 3 and 4 .
[0042]
The ventilated casing thus obtained was subjected to a water pressure resistance test, a dustproof test, and a heating / cooling test in the same manner as in Example 1. As a result, there was no water intrusion, dust intrusion, and damage to the ventilation casing.
[0043]
[Example 3 ]
The product of Example 3 is the ventilation casing shown in FIGS. 5 and 6 . Therefore, the casing 31 was manufactured by injection molding using AW564 (polypropylene resin: flexural modulus 1.35 × 10 9 N / m 2 : melting point 170 ° C.) manufactured by Sumitomo Chemical Co., Ltd. The inner diameter of the opening 32 of the obtained casing 31 was 14 mm at the upper part and 6 mm at the lower part. Further, the breathing member 33 and the reinforcing material 34 are the same as those in Example 1, and a laminate 35 of the breathing member 33 and the reinforcing material 34 was obtained in the same manner as in Example 1. In addition, a bottomed cylindrical body 38 having a through hole 36 formed at the bottom was manufactured by injection molding using the same material as that of the casing 31. The obtained bottomed cylindrical body 38 had a height of 5 mm, an inner diameter of the body portion of 8 mm, and an inner diameter of the bottom through hole 36 of 5 mm. Then, the laminated body 35 is inserted from the upper end opening of the bottomed tubular body 38 with the reinforcing member 34 of the laminated body 35 facing down (the bottom side of the bottomed tubular body). Next, the reinforcing member 34 of the laminated body 35 is brought into contact with the bottom surface of the bottomed cylindrical body 38, and is pressed from the side of the breathing member 33 at a temperature of 160 ° C. and a pressure of 4.9 × 10 5 Pa for 10 seconds. A substantially cylindrical body 37 was obtained. Subsequently, after inserting the substantially cylindrical body 37 into the upper part of the opening 32 of the casing 31 from the bottom, it is pressure-bonded at a temperature of 170 ° C. and a pressure of 4.9 × 10 5 Pa for 10 seconds and thermally fused. 5 and 6 were obtained.
[0044]
The ventilated casing thus obtained was subjected to a water pressure resistance test, a dustproof test, and a heating / cooling test in the same manner as in Example 1. As a result, there was no water intrusion, dust intrusion, and damage to the ventilation casing.
[0045]
[Comparative Example 1]
Comparative Example 1 goods is equipment housing 51 shown in FIG. Therefore, the device casing 51 was manufactured by injection molding using CG7640 (polybutylene terephthalate resin: melting point 225 ° C.) manufactured by Teijin.
[0046]
The device casing 51 thus obtained was subjected to a water pressure test, a dustproof test, and a heating / cooling test in the same manner as in Example 1. As a result, water did not enter and dust did not enter, but damage to the device casing 51 was confirmed.
[0047]
[Comparative Example 2]
Comparative Example 2 dishes are apparatus housing shown in FIG. Therefore, the casing 61 was produced by injection molding using CG7640 (polybutylene terephthalate resin) manufactured by Teijin. The opening 62 of the obtained casing 61 had an inner diameter of 6 mm, an outer diameter of 8 mm, and a height of 15 mm. The ventilation cap 63 was produced by injection molding using Miralastomer 6030 (thermoplastic elastomer) manufactured by Mitsui Chemicals. The obtained ventilation cap 63 had an inner diameter of 7.5 mm, an outer diameter of 9 mm, a height H of 30 mm, and a length L of 40 mm.
[0048]
The device casing thus obtained was subjected to a water pressure test, a dustproof test, and a heating / cooling test in the same manner as in Example 1. As a result, water intrusion and dust intrusion were confirmed, but there was no damage to the equipment casing.
[0049]
【The invention's effect】
As described above, according to the ventilated casing of the present invention, the opening is provided in the peripheral wall of the casing, and the breathing member is attached to the opening with the opening covered. As well as being compact, the dustproof, waterproof and oilproof properties of the ventilation casing can be easily increased. Therefore, it is easy to reduce the price of the ventilation casing.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a first embodiment of a ventilation casing according to the present invention.
FIG. 2 is an explanatory view showing the ventilation casing.
FIG. 3 is an explanatory view showing a second embodiment of the ventilation casing according to the present invention.
FIG. 4 is an explanatory view showing the ventilation casing.
FIG. 5 is an explanatory view showing a third embodiment of the ventilation casing according to the present invention.
FIG. 6 is an explanatory view showing the ventilation casing.
7 is an explanatory diagram showing a conventional apparatus housing.
FIG. 8 is an explanatory view showing another conventional device casing.
[Explanation of symbols]
1 Housing 2 Opening 3 Breathing Member

Claims (6)

筐体の周壁に開口部が設けられ、この開口部に、呼吸部材と補強材とが、開口部を被覆した状態で取り付けられている通気筐体であって、上記補強材の周縁部が上記開口部の周囲部に熱融着または超音波溶着され、この状態の補強材に、上記呼吸部材が、その補強材を介して、上記開口部を被覆した状態で積層され、上記補強材に部分的な接着または融着により一体化しており、上記呼吸部材の表面全体が、筐体の外部の大気中に露出していることを特徴とする通気筐体。An opening is provided in the peripheral wall of the housing, and the breathing member and the reinforcing material are attached to the opening in a state of covering the opening, and the peripheral portion of the reinforcing material is the above-mentioned Heat-sealed or ultrasonically welded to the periphery of the opening , and the breathing member is laminated on the reinforcing material in this state so as to cover the opening through the reinforcing material. A ventilation case characterized in that the whole surface of the breathing member is exposed to the atmosphere outside the case. 呼吸部材の少なくとも一部が、ポリテトラフルオロエチレン樹脂製多孔体およびポリオレフィン樹脂製多孔体のいずれかからなっている請求項1記載の通気筐体。  The ventilation casing according to claim 1, wherein at least a part of the breathing member is made of either a polytetrafluoroethylene resin porous body or a polyolefin resin porous body. 多孔体の気孔率が、50〜99%の範囲である請求項2記載の通気筐体。  The ventilation casing according to claim 2, wherein the porosity of the porous body is in the range of 50 to 99%. 呼吸部材に撥水処理および撥油処理の少なくとも一方を施こしている請求項1〜3のいずれか一項に記載の通気筐体。  The ventilation housing according to any one of claims 1 to 3, wherein the breathing member is subjected to at least one of water repellent treatment and oil repellent treatment. それ自体の開口部を補強材を介して呼吸部材で被覆した略筒状体が筐体の開口部に取り付けられている請求項1〜4のいずれか一項に記載の通気筐体。  The ventilated casing according to any one of claims 1 to 4, wherein a substantially cylindrical body whose own opening is covered with a breathing member via a reinforcing member is attached to the opening of the casing. さらに呼吸部材の側面部が、筐体の外部の大気中に露出している請求項1〜5のいずれか一項に記載の通気筐体。Furthermore, the ventilation | gas_flowing housing | casing as described in any one of Claims 1-5 in which the side part of the breathing member is exposed to the atmosphere outside the housing | casing.
JP34967999A 1999-12-09 1999-12-09 Ventilation enclosure Expired - Fee Related JP4137325B2 (en)

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