JP2007235013A - Waterproof structure of electronic circuit board - Google Patents

Waterproof structure of electronic circuit board Download PDF

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JP2007235013A
JP2007235013A JP2006057362A JP2006057362A JP2007235013A JP 2007235013 A JP2007235013 A JP 2007235013A JP 2006057362 A JP2006057362 A JP 2006057362A JP 2006057362 A JP2006057362 A JP 2006057362A JP 2007235013 A JP2007235013 A JP 2007235013A
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circuit board
electronic circuit
sealing material
elastic sealing
facing portion
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Shinichi Okamoto
真一 岡本
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Denso Corp
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Denso Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof structure of an electronic circuit board in which waterproofness of the electronic circuit board is appropriately secured in an occasion where a sealing portion having a three-dimensional shape is formed at a portion where a housing case and a housing lid are facing. <P>SOLUTION: In the waterproof structure of the electronic circuit board 2, the electronic circuit board 2 is housed between the housing case 3 and the housing lid, and waterproof of the electronic circuit board 2 is performed by an elastic sealing material 5. The elastic sealing material 5 is made by hardening a liquid sealing material, and seals a planate facing portion 11 where the housing case 3 faces the housing liquid and a three-dimensional facing portion 12 where a connector part 22 faces the housing lid, with an elastic repulsive force. The elastic sealing material 5 is, in a compression direction of its cross section, compressed in a condition where a compression rate (T0-T1)/T0×100% when the thickness in a natural state is T0 and the thickness in a compression state is T1 is 20-70%, in both of the planate facing portion 11 and the three-dimensional facing portion 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、弾性シール材によって密封した状態で、電子回路基板を収納ケースと収納蓋との間に収納してなる構造に関する。   The present invention relates to a structure in which an electronic circuit board is stored between a storage case and a storage lid in a state of being sealed with an elastic sealing material.

収納ケースと収納蓋との間に収納する電子回路基板の防水を行う方法としては、例えば、収納ケースと収納蓋との間にシリコーン系接着剤を挟み込み、このシリコーン系接着剤の接着力により防水性を確保する方法がある。また、これ以外にも、シリコーンゴム、EPDMゴム(エチレン−プロピレン−ジエン共重合体ゴム)等からなるOリングを用い、このOリングを圧縮したときの弾性反発力によって防水性を確保する方法もある。
しかし、電子回路基板の防水性を確保するために、接着剤による接着力を利用する場合には、強固な接着力のために、収納ケースと収納蓋とを一旦接着した後に、離すことが極めて困難になる。一方、Oリングによる弾性反発力を利用する場合には、このOリングを圧縮したときの圧縮率(T0−T1)/T0×100%(T0;自然状態の厚み、T1;圧縮状態の厚み)が最大でも30%程度までしか確保することができない。
As a method of waterproofing the electronic circuit board stored between the storage case and the storage lid, for example, a silicone adhesive is sandwiched between the storage case and the storage lid, and the electronic circuit board is waterproofed by the adhesive force of the silicone adhesive. There is a way to ensure sex. In addition to this, there is a method of using O-rings made of silicone rubber, EPDM rubber (ethylene-propylene-diene copolymer rubber), etc., and securing waterproofness by elastic repulsion when the O-ring is compressed. is there.
However, in order to secure the waterproofness of the electronic circuit board, when using the adhesive force by the adhesive, it is extremely difficult to separate the storage case and the storage lid after bonding them for the sake of strong adhesive strength. It becomes difficult. On the other hand, when the elastic repulsive force by the O-ring is used, the compression ratio (T0−T1) / T0 × 100% when the O-ring is compressed (T0: thickness in the natural state, T1; thickness in the compressed state) However, it is only possible to secure up to about 30%.

上記問題点を解決するために、例えば、特許文献1の電子装置においては、ポリスチレン系熱可塑性エラストマーをベースとし、プロセスオイルと粘着付与樹脂を含有するシール材を用いて、容器と蓋との間を密封して電子回路部品の防水を行っている。この特許文献1のシール材は、耐熱性が高く、また適度な柔らかさを持つ粘弾性材料であるため、反発力と粘着力を兼ね備えている。これにより、特許文献1においては、耐熱性と防水性に優れ、かつ容器と蓋の繰り返し開閉が可能で、容器、蓋及び電子回路部品を再利用することを可能にしている。   In order to solve the above problem, for example, in the electronic device of Patent Document 1, a sealing material containing a process oil and a tackifying resin is used between a container and a lid, based on a polystyrene-based thermoplastic elastomer. The electronic circuit parts are waterproofed by sealing. Since the sealing material of Patent Document 1 is a viscoelastic material having high heat resistance and moderate softness, it has both repulsive force and adhesive force. Thereby, in patent document 1, it is excellent in heat resistance and waterproofness, the container and a lid can be opened and closed repeatedly, and the container, the lid, and the electronic circuit component can be reused.

また、適用箇所の柔軟性等に優れるシール材として、例えば、特許文献2に開示されるように、液状のガスケットをシール部位に施工し、この液状のガスケットを硬化させた後に生ずる反発弾性力を利用してシールを行う現場成形ガスケットが知られている。この現場成形ガスケットを用いれば、種々の形状の部品のシール部位に対しても、柔軟にシール材を施工することができる。   In addition, as a sealing material excellent in flexibility at an application location, for example, as disclosed in Patent Document 2, a rebound elastic force generated after a liquid gasket is applied to a seal portion and the liquid gasket is cured is used. In-situ molded gaskets that use and seal are known. If this on-site molded gasket is used, a sealing material can be flexibly applied even to seal parts of parts having various shapes.

しかしながら、収納ケースと収納蓋との間に電子回路基板を収納する際に、収納ケースと収納蓋とが対面するシール部位が3次元形状を有している場合には、更なる工夫を行う必要がある。すなわち、3次元形状を有するシール部位においては、シール材を圧縮する方向が平面状ではないため、シール材の圧縮量を適切に維持することができないと、電子回路基板の防水性を確保することが困難になる。   However, when the electronic circuit board is stored between the storage case and the storage lid, if the seal part facing the storage case and the storage lid has a three-dimensional shape, further measures must be taken. There is. That is, in the sealing portion having a three-dimensional shape, the direction of compressing the sealing material is not flat, and therefore the waterproofness of the electronic circuit board is ensured if the amount of compression of the sealing material cannot be maintained appropriately. Becomes difficult.

特開2005−93602JP-A-2005-93602 WO2002/068482WO2002 / 068482

本発明は、かかる従来の問題点に鑑みてなされたもので、収納ケースと収納蓋とが対面する部位に、3次元形状を有するシール部位が形成される場合において、電子回路基板の防水性を適切に確保することができる電子回路基板の防水構造を提供しようとするものである。   The present invention has been made in view of such conventional problems, and in the case where a seal portion having a three-dimensional shape is formed at a portion where the storage case and the storage lid face each other, the waterproof property of the electronic circuit board is improved. An object of the present invention is to provide a waterproof structure for an electronic circuit board that can be appropriately secured.

本発明は、収納ケースと収納蓋との間に電子回路基板を収納し、弾性シール材によって上記電子回路基板の防水を行う構造において、
上記電子回路基板は、基板本体と、当該電子回路基板の外部との電気信号の送受信を行うためのコネクタ部とを有しており、該コネクタ部は、上記基板本体から上記収納蓋側に向けて隆起すると共に該基板本体の側部から突出しており、
上記弾性シール材は、上記収納ケースと上記収容蓋とが対面する平面状対面部位と、上記コネクタ部と上記収容蓋とが対面する立体状対面部位とに連続した状態で、上記基板本体の周囲を一巡して施工した液状シール材料を硬化させてなり、
上記平面状対面部位と上記立体状対面部位とは、上記弾性シール材を圧縮させたときの弾性反発力によって密封してあり、
上記弾性シール材は、その断面の圧縮方向において、自然状態の厚みをT0、圧縮状態の厚みをT1としたときの圧縮率(T0−T1)/T0×100%が、20〜70%になる状態で圧縮してあることを特徴とする電子回路基板の防水構造にある(請求項1)。
The present invention is a structure in which an electronic circuit board is stored between a storage case and a storage lid, and the electronic circuit board is waterproofed by an elastic sealing material.
The electronic circuit board has a board body and a connector part for transmitting and receiving electrical signals to and from the outside of the electronic circuit board, and the connector part is directed from the board body to the storage lid side. And protrudes from the side of the substrate body,
The elastic sealing material is formed around the substrate body in a state where it is continuous with a planar facing portion where the storage case and the receiving lid face each other and a three-dimensional facing portion where the connector portion and the receiving lid face each other. The liquid sealing material that was applied in a round is cured,
The planar facing portion and the three-dimensional facing portion are sealed by an elastic repulsive force when the elastic sealing material is compressed,
In the compression direction of the cross section, the elastic sealing material has a compression ratio (T0−T1) / T0 × 100% of 20 to 70% when the natural thickness is T0 and the compressed thickness is T1. The electronic circuit board waterproof structure is characterized by being compressed in a state (Claim 1).

本発明の電子回路基板の防水構造は、弾性シール材を設けるためのシール部位が、上記平面状対面部位と立体状対面部位とによる3次元形状を有している場合に、電子回路基板の防水を効果的に行う工夫を行っている。
具体的には、本発明においては、上記弾性シール材を設ける際には、電子回路基板と収納ケースとの組付体における平面状対面部位及び立体状対面部位、又は収納蓋における平面状対面部位及び立体状対面部位に連続して液状シール材料を施工する。
The waterproof structure for an electronic circuit board according to the present invention provides a waterproof structure for an electronic circuit board when a sealing portion for providing an elastic sealing material has a three-dimensional shape composed of the planar facing portion and the three-dimensional facing portion. We are trying to make it effective.
Specifically, in the present invention, when the elastic sealing material is provided, the planar facing portion and the three-dimensional facing portion in the assembly of the electronic circuit board and the storage case, or the planar facing portion in the storage lid In addition, the liquid sealing material is applied continuously to the three-dimensional facing part.

そして、施工した液状シール材料を硬化させた後、電子回路基板と収納ケースとの組付体と、収納蓋とを組み付け、収納ケースと収納蓋との間に電子回路基板を収納する。このとき、電子回路基板における基板本体の周囲を一巡した状態で弾性シール材が配置され、収納ケースと収納蓋との間から水が浸入しないようにして、電子回路基板の防水を行うことができる。   And after hardening the applied liquid sealing material, the assembly body of an electronic circuit board and a storage case and a storage cover are assembled | attached, and an electronic circuit board is stored between a storage case and a storage cover. At this time, the electronic circuit board can be waterproofed by arranging the elastic sealing material in a state of making a circuit around the substrate body in the electronic circuit board and preventing water from entering between the storage case and the storage lid. .

こうして、収納ケースと収納蓋との間の平面状対面部位、及びコネクタ部と収納蓋との間の立体状対面部位とに弾性シール材を挟持したときには、弾性シール材を、平面状対面部位と立体状対面部位とのいずれにおいても、その圧縮率(T0−T1)/T0×100%が、20〜70%になる状態で圧縮させる。そして、収納ケースと収納蓋との間の隙間、及びコネクタ部と収納蓋との間の隙間を、弾性シール材による弾性反発力によって密封して、電子回路基板の防水を行うことができる。   Thus, when the elastic seal material is sandwiched between the planar facing portion between the storage case and the storage lid and the three-dimensional facing portion between the connector portion and the storage lid, the elastic sealing material is replaced with the planar facing portion. In any of the three-dimensional facing portions, compression is performed in a state where the compression ratio (T0-T1) / T0 × 100% is 20 to 70%. Then, the gap between the storage case and the storage lid and the gap between the connector portion and the storage lid are sealed by an elastic repulsion force by the elastic seal material, so that the electronic circuit board can be waterproofed.

このように、本発明においては、弾性シール材の圧縮率を考慮することにより、平面状対面部位における密封性を向上させるだけでなく、立体状対面部位における密封性も向上させることができる。
それ故、本発明の電子回路基板の防水構造によれば、弾性シール材によって防水を行う部位が、平面状対面部位と立体状対面部位との3次元形状を有する場合において、電子回路基板の防水を適切に行うことができる。
Thus, in the present invention, by considering the compressibility of the elastic sealing material, not only the sealing performance at the planar facing portion can be improved but also the sealing performance at the three-dimensional facing portion can be improved.
Therefore, according to the waterproof structure of the electronic circuit board of the present invention, when the part to be waterproofed by the elastic sealing material has a three-dimensional shape of a planar facing part and a three-dimensional facing part, the waterproofing of the electronic circuit board is possible. Can be performed appropriately.

上述した本発明における好ましい実施の形態につき説明する。
本発明において、上記弾性シール材の圧縮率(T0−T1)/T0×100%が、20%未満の場合には、弾性シール材に耐久後の劣化が生じた際に、特に、上記立体状対面部位における密封性を十分に確保できないおそれがある。一方、上記弾性シール材の圧縮率(T0−T1)/T0×100%が、70%を超える場合には、弾性シール材に割れやへたり等の劣化が生じて、弾性シール材の弾性反発力が低下し、密封性を十分に確保できないおそれがある。
A preferred embodiment of the present invention described above will be described.
In the present invention, when the compression ratio (T0-T1) / T0 × 100% of the elastic sealing material is less than 20%, the above three-dimensional shape particularly occurs when the elastic sealing material deteriorates after durability. There is a possibility that the sealing property at the facing part cannot be sufficiently ensured. On the other hand, when the compression ratio (T0-T1) / T0 × 100% of the elastic sealing material exceeds 70%, the elastic sealing material is deteriorated such as cracking or sag, and the elastic repulsion of the elastic sealing material is caused. The force is reduced, and there is a risk that sufficient sealing cannot be secured.

また、上記弾性シール材は、上記収納ケースと上記コネクタ部とが対面する平面状対面部位にも設けてあることが好ましい(請求項2)。
この場合には、収納ケースとコネクタ部との間の隙間も、上記圧縮率を考慮した弾性シール材による弾性反発力によって密封することができ、電子回路基板の防水を一層効果的に行うことができる。
Moreover, it is preferable that the said elastic sealing material is provided also in the planar facing part which the said storage case and the said connector part face.
In this case, the gap between the storage case and the connector portion can also be sealed by the elastic repulsion force of the elastic sealing material considering the compression rate, and the electronic circuit board can be waterproofed more effectively. it can.

また、上記電子回路基板は、車両のエンジンの制御を行うエンジン制御回路基板とすることが好ましい(請求項3)。
エンジン制御回路基板においては、周囲の環境温度が例えば110℃以上もの高温になることがあり、防水性を確保しにくい環境に配置される。そのため、エンジン制御回路基板の防水構造に、上記圧縮率を考慮した弾性シール材による防水構造を採用することにより、エンジン制御回路基板の防水性を効果的に確保することができる。
The electronic circuit board is preferably an engine control circuit board that controls a vehicle engine.
In the engine control circuit board, the ambient environmental temperature may be as high as 110 ° C. or more, for example, and the engine control circuit board is disposed in an environment where it is difficult to ensure waterproofness. Therefore, the waterproofness of the engine control circuit board can be effectively ensured by adopting the waterproof structure of the elastic seal material in consideration of the compression rate as the waterproof structure of the engine control circuit board.

また、上記弾性シール材は、シリコーン系樹脂からなることが好ましい(請求項4)。
この場合には、上記20〜70%の圧縮率(T0−T1)/T0×100%を有する弾性シール材の選定が容易である。また、この場合には、加熱することによって硬化するよう構成された液体状のシリコーン系樹脂を上記液状シール材料として用いることができる。
また、シリコーン系樹脂としては、種々の成分を含有するものとすることができる。シリコーン系樹脂は、例えば、オルガノポリシロキサン、シリカ、顔料(必要に応じて)、白金触媒、1,4−ブタンジオール、オルガノシラン及びその他添加剤を含有して構成することができる。
The elastic sealing material is preferably made of a silicone resin.
In this case, it is easy to select an elastic sealing material having a compression ratio (T0-T1) / T0 × 100% of 20 to 70%. In this case, a liquid silicone resin configured to be cured by heating can be used as the liquid sealing material.
The silicone resin can contain various components. The silicone-based resin can be configured to contain, for example, organopolysiloxane, silica, pigment (if necessary), platinum catalyst, 1,4-butanediol, organosilane, and other additives.

また、上記シリコーン系樹脂は、独立気泡を有する発泡体であることが好ましい(請求項5)。
この場合には、弾性シール材の圧縮率(T0−T1)/T0×100%を20〜70%の圧縮率にすることが容易である。
The silicone resin is preferably a foam having closed cells.
In this case, it is easy to set the compression rate (T0−T1) / T0 × 100% of the elastic sealing material to a compression rate of 20 to 70%.

また、上記弾性シール材は、アクリル系樹脂からなることもできる(請求項6)。
この場合にも、上記20〜70%の圧縮率(T0−T1)/T0×100%を有する弾性シール材の選定が容易である。また、この場合には、紫外線を照射することによって硬化するよう構成された液体状のアクリル系樹脂を上記液状シール材料として用いることができる。
また、アクリル系樹脂としては、種々の成分を含有するものとすることができる。アクリル系樹脂は、例えば、メタアクリルアロイ基を有するビニル系重合体、エチレン性不飽和基を有する化合物、チキソ性付与剤、乾式シリカ粉末及び光重合開始剤を含有して構成することができる。
The elastic sealing material may be made of an acrylic resin.
Also in this case, it is easy to select an elastic sealing material having the compression ratio (T0-T1) / T0 × 100% of 20 to 70%. In this case, a liquid acrylic resin configured to be cured by irradiation with ultraviolet rays can be used as the liquid sealing material.
In addition, the acrylic resin can contain various components. The acrylic resin can be configured to contain, for example, a vinyl polymer having a methacryl alloy group, a compound having an ethylenically unsaturated group, a thixotropic agent, a dry silica powder, and a photopolymerization initiator.

また、上記弾性シール材は、上記シリコーン系樹脂又はアクリル系樹脂以外にも、種々のゴム又は樹脂から構成することもでき、例えば、ウレタン系樹脂から構成することもできる。
また、上記弾性シール材は、110℃の温度環境下に1000時間放置した後においても、30kPa以上の圧力に対して気密性を確保することができる材質の材料から構成することが好ましい。この場合には、特に、電子回路基板の防水構造を、車両のエンジンの制御を行うエンジン制御回路基板としたときには、このエンジン制御回路基板の防水性を適切に確保することができる。
Moreover, the said elastic sealing material can also be comprised from various rubber | gum or resin other than the said silicone resin or acrylic resin, for example, can also be comprised from urethane type resin.
The elastic sealing material is preferably made of a material that can ensure hermeticity against a pressure of 30 kPa or more even after being left in a temperature environment of 110 ° C. for 1000 hours. In this case, in particular, when the waterproof structure of the electronic circuit board is an engine control circuit board that controls the engine of the vehicle, the waterproofness of the engine control circuit board can be appropriately ensured.

以下に、本発明の電子回路基板の防水構造にかかる実施例につき、図1〜図9と共に説明する。
本例の電子回路基板2の防水構造は、図1、図2、図7に示すごとく、車両のエンジンの制御を行う電子制御ユニット(ECU)1に適用している。本例の電子回路基板2は、電子制御ユニット1におけるエンジン制御回路基板であり、本例の電子回路基板2の防水構造においては、アルミニウム等の金属からなる収納ケース3と樹脂からなる収納蓋4との間に電子回路基板2を収納し、弾性シール材5によって上記電子回路基板2の防水を行っている。
Hereinafter, embodiments of the waterproof structure for an electronic circuit board according to the present invention will be described with reference to FIGS.
The waterproof structure of the electronic circuit board 2 of this example is applied to an electronic control unit (ECU) 1 that controls the engine of a vehicle, as shown in FIGS. The electronic circuit board 2 of this example is an engine control circuit board in the electronic control unit 1, and in the waterproof structure of the electronic circuit board 2 of this example, a storage case 3 made of metal such as aluminum and a storage lid 4 made of resin. The electronic circuit board 2 is housed in between, and the electronic circuit board 2 is waterproofed by the elastic sealing material 5.

具体的には、図1、図2に示すごとく、電子回路基板2は、基板本体21と、当該電子回路基板2の外部との電気信号の送受信を行うためのコネクタ部22とを有している。このコネクタ部22は、基板本体21から収納蓋4側に向けて隆起すると共に基板本体21の側部から突出している。コネクタ部22は、絶縁性の樹脂からなるコネクタケース部221内に、導通性を有するコネクタピン222を配置してなる。   Specifically, as shown in FIGS. 1 and 2, the electronic circuit board 2 has a board body 21 and a connector portion 22 for transmitting and receiving electrical signals to and from the outside of the electronic circuit board 2. Yes. The connector portion 22 protrudes from the substrate body 21 toward the storage lid 4 and protrudes from the side portion of the substrate body 21. The connector portion 22 is formed by arranging conductive connector pins 222 in a connector case portion 221 made of insulating resin.

また、図1、図3に示すごとく、本例の弾性シール材5は、キュアード・インプレイス・ガスケット(CIPG)と呼ばれる現場成形ガスケットを適用して構成してある。弾性シール材5は、収納ケース3と収納蓋4とが対面する平面状対面部位11と、コネクタ部22と収納蓋4とが対面する立体状対面部位12とに連続した状態で設けてある。また、弾性シール材5は、平面状対面部位11及び立体状対面部位12に対して施工した液状シール材料51を硬化させてなるものである。
なお、図1は、収納ケース3における平面状対面部位11と、コネクタ部22における立体状対面部位12とに弾性シール材5を設けた状態を示す図である。同図に示すごとく、弾性シール材5は、その断面形状がビード形状(円弧状表面を有する形状)に設けられる。また、図2は、電子回路基板2、収納ケース3及び収納蓋4を分解した状態を示す図である。
As shown in FIGS. 1 and 3, the elastic sealing material 5 of this example is configured by applying an in-situ molded gasket called a cured in-place gasket (CIPG). The elastic sealing material 5 is provided in a state of being continuous with a planar facing portion 11 where the storage case 3 and the storage lid 4 face each other and a three-dimensional facing portion 12 where the connector portion 22 and the storage lid 4 face each other. The elastic sealing material 5 is obtained by curing the liquid sealing material 51 applied to the planar facing portion 11 and the three-dimensional facing portion 12.
FIG. 1 is a view showing a state in which the elastic sealing material 5 is provided on the planar facing portion 11 in the storage case 3 and the three-dimensional facing portion 12 in the connector portion 22. As shown in the figure, the elastic sealing material 5 is provided with a bead shape (a shape having an arcuate surface) in cross section. FIG. 2 is a diagram illustrating a state in which the electronic circuit board 2, the storage case 3, and the storage lid 4 are disassembled.

そして、本例の電子回路基板2の防水構造においては、弾性シール材5が基板本体21の周囲を一巡して設けてある。また、平面状対面部位11と立体状対面部位12とは、弾性シール材5を圧縮させたときの弾性反発力によって密封してある。
図3は、収納ケース3に液状シール材料51を施工し硬化させて弾性シール材5とした状態(破線で示す)と、収納ケース3と収納蓋4との間に弾性シール材5を圧縮させて、挟持した状態とを示す図である。
In the waterproof structure of the electronic circuit board 2 of this example, the elastic sealing material 5 is provided around the board body 21. Further, the planar facing portion 11 and the three-dimensional facing portion 12 are sealed by an elastic repulsive force when the elastic sealing material 5 is compressed.
FIG. 3 shows a state in which the liquid seal material 51 is applied to the storage case 3 and cured to form the elastic seal material 5 (shown by a broken line), and the elastic seal material 5 is compressed between the storage case 3 and the storage lid 4. FIG.

さらに、図3に示すごとく、弾性シール材5は、その断面の圧縮方向Dにおいて、平面状対面部位11と立体状対面部位12とのいずれにおいても、自然状態の厚みをT0、圧縮状態の厚みをT1としたときの圧縮率(T0−T1)/T0×100%が、20〜70%になる状態で圧縮してある。
また、本例の弾性シール材5は、収納ケース3とコネクタ部22とが対面する第2平面状対面部位13にも設けてある。そして、弾性シール材5は、第2平面状対面部位13においても、上記20〜70%の圧縮率(T0−T1)/T0×100%で圧縮した状態で設けてある。
Further, as shown in FIG. 3, the elastic sealing material 5 has a natural state thickness T0 and a compressed state thickness in both the planar facing portion 11 and the three-dimensional facing portion 12 in the compression direction D of the cross section. The compression ratio (T0−T1) / T0 × 100% when T is T1 is 20 to 70%.
The elastic sealing material 5 of this example is also provided at the second planar facing portion 13 where the storage case 3 and the connector portion 22 face each other. And the elastic sealing material 5 is provided in the compressed state (T0-T1) / T0 * 100% of said 20-70% also in the 2nd planar facing part 13. FIG.

図1に示すごとく、平面状対面部位11は、電子回路基板2の板面に略平行に形成されており、立体状対面部位12は、電子回路基板2の板面に略平行な平面部121と、この平面部121に交錯する起立部122とを有して形成されている。平面部121は、コネクタ部22の上面(基板本体21と対面する側の表面とは反対側の表面)に形成されており、起立部122は、コネクタ部22の上面の両側に位置する側面に形成されている。   As shown in FIG. 1, the planar facing portion 11 is formed substantially parallel to the plate surface of the electronic circuit board 2, and the three-dimensional facing portion 12 is a plane portion 121 substantially parallel to the plate surface of the electronic circuit board 2. And an upright portion 122 that intersects with the flat surface portion 121. The flat surface portion 121 is formed on the upper surface of the connector portion 22 (the surface opposite to the surface facing the substrate body 21), and the upright portions 122 are on the side surfaces located on both sides of the upper surface of the connector portion 22. Is formed.

なお、平面状対面部位11は、収納ケース3の表面と収納蓋4の表面とに形成されているが、便宜上、両者をまとめて符号11によって表す。また、立体状対面部位12は、コネクタ部22の表面(平面部121)と収納蓋4の表面とに形成されているが、便宜上、両者をまとめて符号12によって表す。また、第2平面状対面部位13は、収納ケース3の表面とコネクタ部22の表面とに形成されているが、便宜上、両者をまとめて符号13によって表す。   In addition, although the planar facing part 11 is formed in the surface of the storage case 3 and the surface of the storage cover 4, both are collectively represented by the code | symbol 11 for convenience. In addition, the three-dimensional facing portion 12 is formed on the surface of the connector portion 22 (plane portion 121) and the surface of the storage lid 4, but for convenience, both are collectively denoted by reference numeral 12. Moreover, although the 2nd planar facing part 13 is formed in the surface of the storage case 3, and the surface of the connector part 22, both are collectively shown with the code | symbol 13 for convenience.

本例の弾性シール材5は、シリコーン系樹脂の発泡体からなる。この発泡体は、樹脂中に多数の独立気泡を存在させてなる(樹脂中に多数の気泡を孤立して存在させている)。そして、弾性シール材5は、多数の独立気泡による容積を縮小させるようにして圧縮して、弾性反発力を発生するよう構成してある。
また、本例の液状シール材料51は、加熱することによって硬化するよう構成された液体状のシリコーン系樹脂である。
The elastic sealing material 5 of this example is made of a silicone resin foam. This foam has a large number of closed cells in the resin (a large number of bubbles are present in isolation in the resin). And the elastic sealing material 5 is comprised so that the volume by many independent bubbles may be compressed, and an elastic repulsive force may be generated.
Moreover, the liquid sealing material 51 of this example is a liquid silicone resin configured to be cured by heating.

また、図4、図6に示すごとく、本例においては、液状シール材料51を吐出させるディスペンサー(液体定量吐出バルブ)61をロボットアーム6の先端部に把持させ、このロボットアーム6によって3次元的に液状シール材料51の塗布を行うよう構成してある。ディスペンサー61は、液状シール材料51を保持する保持容器から配管してあり、ディスペンサー61から所定の流量で液状シール材料51を吐出させるよう構成してある。   As shown in FIGS. 4 and 6, in this example, a dispenser (liquid metering discharge valve) 61 for discharging the liquid sealing material 51 is held at the tip of the robot arm 6, and the robot arm 6 makes a three-dimensional view. The liquid sealing material 51 is applied. The dispenser 61 is piped from a holding container that holds the liquid sealing material 51, and is configured to discharge the liquid sealing material 51 from the dispenser 61 at a predetermined flow rate.

本例においては、次の各工程を行って、電子回路基板(エンジン制御回路基板)2を備えた電子制御ユニット1を製造する。
本例においては、まず、図4に示すごとく、収納ケース3における第2平面状対面部位13(電子回路基板2におけるコネクタ部22を配置する部位)に液状シール材料51を施工する。この液状シール材料51は、収納ケース3の一方側表面31において、コネクタ部22を配置する一方側辺311に沿って直線状に施工する。そして、収納ケース3に施工した液状シール材料51を加熱して硬化させ、弾性シール材5とする。
In this example, the following steps are performed to manufacture the electronic control unit 1 including the electronic circuit board (engine control circuit board) 2.
In this example, first, as shown in FIG. 4, the liquid sealing material 51 is applied to the second planar facing portion 13 (the portion where the connector portion 22 is disposed in the electronic circuit board 2) in the storage case 3. The liquid sealing material 51 is applied in a straight line along the one side 311 on which the connector portion 22 is arranged on the one side surface 31 of the storage case 3. Then, the liquid sealing material 51 applied to the storage case 3 is heated and cured to obtain the elastic sealing material 5.

次いで、図5に示すごとく、収納ケース3の一方側表面31に対して、基板本体21とコネクタ部22とを組み付けてなる電子回路基板2を配置し、収納ケース3とコネクタ部22とが対面する第2平面状対面部位13において、弾性シール材5を挟持する。
次いで、図6に示すごとく、収納ケース3と電子回路基板2との組付体に対し、ロボットアーム6を移動させて、液状シール材料51を施工する。この液状シール材料51は、収納ケース3における平面状対面部位11(収納ケース3の一方側表面31における上記一方側辺311以外の3辺)と、電子回路基板2のコネクタ部22における立体状対面部位12(平面部121及び一対の起立部122)とに連続して施工する。
Next, as shown in FIG. 5, the electronic circuit board 2 formed by assembling the substrate body 21 and the connector part 22 is disposed on the one surface 31 of the storage case 3, and the storage case 3 and the connector part 22 face each other. The elastic sealing material 5 is clamped in the second planar facing portion 13 that performs.
Next, as shown in FIG. 6, the liquid seal material 51 is applied by moving the robot arm 6 with respect to the assembly of the storage case 3 and the electronic circuit board 2. The liquid sealing material 51 is formed in a planar facing portion 11 in the storage case 3 (three sides other than the one side 311 on the one side surface 31 of the storage case 3) and a three-dimensional facing in the connector portion 22 of the electronic circuit board 2. It constructs continuously to the site | part 12 (The plane part 121 and a pair of standing part 122).

本例においては、収納ケース3及びコネクタ部22に液状シール材料51を施工することによって、この液状シール材料51を、電子回路基板2における基板本体21の周囲を一巡した状態で施工する。そして、収納ケース3及びコネクタ部22に施工した液状シール材料51を加熱して硬化させ、弾性シール材5とする。
なお、液状シール材料51は、収納蓋4における平面状対面部位11及び立体状対面部位12に連続して施工することもできる。
In this example, the liquid seal material 51 is applied to the storage case 3 and the connector portion 22, so that the liquid seal material 51 is applied around the substrate body 21 in the electronic circuit board 2. Then, the liquid sealing material 51 applied to the storage case 3 and the connector portion 22 is heated and cured to obtain the elastic sealing material 5.
The liquid sealing material 51 can also be applied continuously to the planar facing part 11 and the three-dimensional facing part 12 in the storage lid 4.

次いで、図7に示すごとく、電子回路基板2と収納ケース3との組付体と、収納蓋4とを組み付け、収納ケース3と収納蓋4との間に電子回路基板2を収納する。このとき、電子回路基板2における基板本体21の周囲を一巡した状態で弾性シール材5が配置される。そして、収納ケース3と収納蓋4とが対面する平面状対面部位11、及びコネクタ部22と収納蓋4とが対面する立体状対面部位12において、弾性シール材5を挟持する。
こうして、収納ケース3と収納蓋4とをビス等の固定具によって締め付け、電子回路基板2を収納してなる電子制御ユニット1を製造する。
なお、各対面部位11、12、13における弾性シール材5の圧縮率(T0−T1)/T0×100%は、固定具により収納ケース3と収納蓋4とを締め付けたときに、20〜70%になるように設定することができる。
Next, as shown in FIG. 7, the assembly body of the electronic circuit board 2 and the storage case 3 and the storage cover 4 are assembled, and the electronic circuit board 2 is stored between the storage case 3 and the storage cover 4. At this time, the elastic sealing material 5 is disposed in a state of making a round around the substrate body 21 in the electronic circuit board 2. The elastic sealing material 5 is sandwiched between the planar facing portion 11 where the storage case 3 and the storage lid 4 face each other and the three-dimensional facing portion 12 where the connector portion 22 and the storage lid 4 face each other.
In this way, the storage case 3 and the storage lid 4 are tightened with a fixing tool such as a screw to manufacture the electronic control unit 1 in which the electronic circuit board 2 is stored.
Note that the compression rate (T0-T1) / T0 × 100% of the elastic sealing material 5 at each facing portion 11, 12, 13 is 20 to 70 when the storage case 3 and the storage lid 4 are fastened by a fixture. % Can be set.

その後、図8に示すごとく、弾性シール材5による電子制御ユニット1の密封性を確認するために、気密試験を行う。この気密試験は、電子制御ユニット1内を、所定時間大気圧よりも高い所定の圧力状態に維持して、電子制御ユニット1の弾性シール材5によるシール部位からエアのリークがないかを確認するものである。
より具体的には、エアポンプを用いて、電子制御ユニット1内を所定の圧力状態に維持し、所定時間の間、エアポンプと電子制御ユニット1とを繋ぐ配管の途中に設けた流量計の流量変化を測定する。そして、電子制御ユニット1のシール部位においてエアのリークがあるときには、エアポンプが電子制御ユニット1内へさらにエアを送り込むため、このときの流量計によるエアの流量を読み込んで、エアのリークの有無を確認する。
Thereafter, as shown in FIG. 8, an airtight test is performed in order to confirm the sealing performance of the electronic control unit 1 by the elastic sealing material 5. In this airtight test, the inside of the electronic control unit 1 is maintained at a predetermined pressure state higher than the atmospheric pressure for a predetermined time, and it is confirmed whether there is any air leak from the sealing portion by the elastic sealing material 5 of the electronic control unit 1. Is.
More specifically, using an air pump, the inside of the electronic control unit 1 is maintained at a predetermined pressure state, and the flow rate change of a flow meter provided in the middle of the pipe connecting the air pump and the electronic control unit 1 for a predetermined time. Measure. When there is an air leak at the seal portion of the electronic control unit 1, the air pump further sends air into the electronic control unit 1, so the flow rate of air by the flow meter at this time is read to check whether there is an air leak. Check.

ところで、車両のエンジンの制御を行う電子制御ユニット1は、約100℃もの高温になるエンジンルーム内に配設される。そして、電子制御ユニット1には、過酷な条件下においても、密封性を確保できることが要求される。具体的には、電子制御ユニット1を配設したエンジンルームが約100℃の高温状態にあるとき、電子制御ユニット1が突如約0℃の水中に水没したときに、電子制御ユニット1内に負圧が生じても、この電子制御ユニット1内へ水が浸入しないことを密封性の条件としている。   By the way, the electronic control unit 1 that controls the engine of the vehicle is disposed in an engine room that is as high as about 100 ° C. The electronic control unit 1 is required to be able to ensure sealing performance even under severe conditions. Specifically, when the engine room in which the electronic control unit 1 is disposed is in a high temperature state of about 100 ° C., and the electronic control unit 1 is suddenly submerged in water at about 0 ° C., the electronic control unit 1 is negatively charged. Even if pressure is generated, the sealing condition is that water does not enter the electronic control unit 1.

そして、ボイルシャルルの法則から、電子制御ユニット1の温度が、突如100℃から0℃になったときには、約26kPaの負圧が発生すると考えられるため、余裕度を考慮して30kPaを電子制御ユニット1における要求シール圧とする。なお、気密試験は、電子制御ユニット1内を正圧の状態にして行っている。
また、上記気密試験においては、電子制御ユニット1内を30kPaの圧力状態に1分間維持したときのエアのリークの有無を確認している。
From the Boyle Charles' law, when the temperature of the electronic control unit 1 suddenly changes from 100 ° C. to 0 ° C., it is considered that a negative pressure of about 26 kPa is generated. 1 is the required seal pressure. The airtight test is performed with the inside of the electronic control unit 1 in a positive pressure state.
Further, in the above airtight test, it is confirmed whether or not there is an air leak when the inside of the electronic control unit 1 is maintained at a pressure state of 30 kPa for 1 minute.

本例の電子制御ユニット1においては、収納ケース3と収納蓋4との間の平面状対面部位11、収納ケース3とコネクタ部22との間の第2平面状対面部位13、及びコネクタ部22と収納蓋4との間の立体状対面部位12に、それぞれ弾性シール材5を挟持したときには、弾性シール材5を、いずれの部位においても、その圧縮率(T0−T1)/T0×100%が、20〜70%になる状態で圧縮させる。
そして、収納ケース3と収納蓋4との間の隙間、収納ケース3とコネクタ部22との間の隙間、及びコネクタ部22と収納蓋4との間の隙間を、弾性シール材5による弾性反発力によって密封して、電子制御ユニット1内へ水が浸入しないようにする。
In the electronic control unit 1 of this example, the planar facing portion 11 between the storage case 3 and the storage lid 4, the second planar facing portion 13 between the storage case 3 and the connector portion 22, and the connector portion 22. When the elastic sealing material 5 is sandwiched between the three-dimensional facing parts 12 between the storage lid 4 and the storage lid 4, the compression ratio (T0-T1) / T0 × 100% Is compressed in a state of 20 to 70%.
Then, the elastic sealant 5 repels the clearance between the storage case 3 and the storage lid 4, the clearance between the storage case 3 and the connector portion 22, and the clearance between the connector portion 22 and the storage lid 4. Sealed by force to prevent water from entering the electronic control unit 1.

このように、本例の電子制御ユニット1においては、弾性シール材5の圧縮率を考慮することにより、平面状対面部位11及び第2平面状対面部位13における密封性を向上させるだけでなく、立体状対面部位12における密封性も向上させることができる。
それ故、本例の電子回路基板2の防水構造によれば、弾性シール材5によって防水を行う部位が、平面状対面部位11と立体状対面部位12との3次元形状を有する場合において、電子回路基板2の防水を適切に行うことができる。
Thus, in the electronic control unit 1 of this example, by considering the compressibility of the elastic sealing material 5, not only the sealing performance at the planar facing portion 11 and the second planar facing portion 13 is improved, The sealing property in the three-dimensional facing part 12 can also be improved.
Therefore, according to the waterproof structure of the electronic circuit board 2 of this example, when the portion to be waterproofed by the elastic seal material 5 has a three-dimensional shape of the planar facing portion 11 and the three-dimensional facing portion 12, The circuit board 2 can be appropriately waterproofed.

また、本例の電子制御ユニット1は、弾性シール材5の弾性反発力を利用して防水を行うものであるため、電子回路基板2、収納ケース3及び収納蓋4の組付を行った後、上記ビス等の固定具を取り外せば、簡単に電子回路基板2、収納ケース3及び収納蓋4の別々の部品に分解することができる。そして、電子回路基板2、収納ケース3及び収納蓋4の組付、分解を繰り返し行うことができる。そのため、例えば、電子回路基板2の修理を容易に行うことができる。また、故障した電子回路基板2を他の正常な電子回路基板2に取り替えたり、電子回路基板2、収納ケース3又は収納蓋4を他の電子制御ユニット1に再利用すること等を容易に行うことができる。   Further, since the electronic control unit 1 of this example is waterproofed by using the elastic repulsive force of the elastic seal material 5, after the electronic circuit board 2, the storage case 3, and the storage lid 4 are assembled. If the fixing tool such as the screw is removed, the electronic circuit board 2, the storage case 3, and the storage lid 4 can be easily disassembled. Then, the assembly and disassembly of the electronic circuit board 2, the storage case 3, and the storage lid 4 can be repeated. Therefore, for example, the electronic circuit board 2 can be repaired easily. Further, the failed electronic circuit board 2 can be easily replaced with another normal electronic circuit board 2, or the electronic circuit board 2, the storage case 3, or the storage lid 4 can be easily reused for another electronic control unit 1. be able to.

(圧縮率の確認試験)
本例においては、弾性シール材5の圧縮率(T0−T1)/T0×100%と、密封性(シール性能)との関係を調査した。すなわち、弾性シール材5を所定の圧縮率で一対の試験片の間に挟持し、110℃の温度環境下において1000時間放置しても、一対の試験片の間に弾性シール材5によって囲んで形成した空間に、エアのリークが発生しないかを基準にして、密封性の良否の判断を行った。
(Compression rate confirmation test)
In this example, the relationship between the compression ratio (T0-T1) / T0 × 100% of the elastic sealing material 5 and the sealing performance (sealing performance) was investigated. That is, even when the elastic sealing material 5 is sandwiched between a pair of test pieces at a predetermined compression rate and left in a temperature environment of 110 ° C. for 1000 hours, it is surrounded by the elastic sealing material 5 between the pair of test pieces. The quality of the sealing performance was determined based on whether air leakage occurred in the formed space.

図9は、横軸に放置時間をとり、縦軸に弾性シール材5の圧縮率(T0−T1)/T0×100%をとって、密封性の良否を判断した状態を示す説明図である。同図において、弾性シール材5の圧縮率が20〜70%である場合には、110℃の温度環境下に1000時間放置しても、エアのリークがなく、密封性に優れていることがわかった。これに対し、弾性シール材5の圧縮率が70%を超える場合(75%又は80%の場合)には、500時間放置後又は250時間放置後に、弾性シール材5に割れやへたり等の劣化が生じ、密封性に劣ることがわかった。また、弾性シール材5の圧縮率が20%未満の場合(10%の場合)には、約300時間放置後に、特に立体状対面部位12における密封性を十分に確保できないことがわかった。   FIG. 9 is an explanatory diagram showing a state in which the sealing performance is judged by taking the standing time on the horizontal axis and the compressibility (T0−T1) / T0 × 100% of the elastic sealing material 5 on the vertical axis. . In the same figure, when the compression ratio of the elastic sealing material 5 is 20 to 70%, even if it is left in a temperature environment of 110 ° C. for 1000 hours, there is no air leakage and excellent sealing performance. all right. On the other hand, when the compressibility of the elastic sealing material 5 exceeds 70% (in the case of 75% or 80%), after leaving for 500 hours or 250 hours, the elastic sealing material 5 may be cracked or sagged. It was found that deterioration occurred and the sealing performance was poor. Moreover, when the compression rate of the elastic sealing material 5 was less than 20% (in the case of 10%), it was found that the sealing property particularly at the three-dimensional facing portion 12 could not be sufficiently secured after being left for about 300 hours.

図10は、横軸に弾性シール材5の圧縮率(T0−T1)/T0×100%をとり、縦軸に弾性シール材5による耐圧(密封可能圧力)(kPa)をとって、弾性シール材5の耐久後(弾性シール材5を110℃の温度環境下において1000時間放置した後)における耐圧の解析を行った結果を示すグラフである。同図において、耐圧30kPa(上述した要求シール圧)以上を確保するためには、圧縮率を20%以上にする必要があることがわかった。
これらの結果より、弾性シール材5の圧縮率を20〜70%とすることにより、良好な密封性(シール性能)が得られることが確認できた。
In FIG. 10, the horizontal axis represents the compression ratio (T0-T1) / T0 × 100% of the elastic seal material 5, and the vertical axis represents the pressure resistance (sealable pressure) (kPa) by the elastic seal material 5 to indicate the elastic seal. It is a graph which shows the result of having analyzed the pressure resistance after durability of material 5 (after leaving elastic sealing material 5 to stand in a 110 ° C temperature environment for 1000 hours). In the figure, it was found that the compression rate needs to be 20% or more in order to ensure a withstand pressure of 30 kPa (the above-mentioned required seal pressure) or more.
From these results, it was confirmed that by setting the compression rate of the elastic sealing material 5 to 20 to 70%, good sealing performance (sealing performance) can be obtained.

実施例における、収納ケースにおける平面状対面部位と、コネクタ部における立体状対面部位とに弾性シール材を設けた状態を示す斜視図。The perspective view which shows the state which provided the elastic sealing material in the planar facing part in a storage case and the three-dimensional facing part in a connector part in an Example. 実施例における、電子回路基板、収納ケース及び収納蓋を分解した状態を示す説明図。Explanatory drawing which shows the state which decomposed | disassembled the electronic circuit board, the storage case, and the storage cover in an Example. 実施例における、収納ケースと収納蓋との間に弾性シール材を圧縮させて挟持した状態を示す説明図。Explanatory drawing which shows the state which compressed and clamped the elastic sealing material between the storage case and the storage cover in an Example. 実施例における、収納ケースにおける第2平面状対面部位に液状シール材料を施工する状態を示す説明図。Explanatory drawing which shows the state which constructs a liquid sealing material in the 2nd planar facing part in a storage case in an Example. 実施例における、第2平面状対面部位において弾性シール材を挟持する状態を示す説明図。Explanatory drawing which shows the state which clamps an elastic sealing material in the 2nd planar facing part in an Example. 実施例における、収納ケースにおける平面状対面部位と、コネクタ部における立体状対面部位とに液状シール材料を施工する状態を示す説明図。Explanatory drawing which shows the state which constructs a liquid sealing material in the planar facing part in a storage case in the Example, and the three-dimensional facing part in a connector part. 実施例における、収納ケースと収納蓋との間に電子回路基板を収納して、電子制御ユニットを製造した状態を示す説明図。Explanatory drawing which shows the state which accommodated the electronic circuit board between the storage case and the storage cover in an Example, and manufactured the electronic control unit. 実施例における、電子制御ユニットの気密試験を行う状態を示す説明図。Explanatory drawing which shows the state which performs the airtight test of an electronic control unit in an Example. 実施例における、横軸に時間をとり、縦軸に弾性シール材の圧縮率(T0−T1)/T0×100%をとって、密封性の良否を判断した状態を示す説明図。Explanatory drawing which shows the state which took time on the horizontal axis | shaft in an Example and took the compression rate (T0-T1) / T0 * 100% of the elastic sealing material on the vertical axis | shaft, and determined the quality of the sealing performance. 実施例における、横軸に弾性シール材の圧縮率(T0−T1)/T0×100%をとり、縦軸に弾性シール材による耐圧をとって、圧縮率と耐圧との関係を示すグラフ。The graph which shows the compression rate (T0-T1) / T0 * 100% of an elastic sealing material in an Example, and takes the pressure | voltage resistance by an elastic sealing material on a vertical axis | shaft, and shows the relationship between a compression rate and a pressure | voltage resistance in an Example.

符号の説明Explanation of symbols

1 電子制御ユニット
11 平面状対面部位
12 立体状対面部位
13 第2平面状対面部位
2 電子回路基板
21 基板本体
22 コネクタ部
3 収納ケース
4 収納蓋
5 弾性シール材
51 液状シール材料
DESCRIPTION OF SYMBOLS 1 Electronic control unit 11 Planar facing part 12 Three-dimensional facing part 13 2nd planar facing part 2 Electronic circuit board 21 Substrate body 22 Connector part 3 Storage case 4 Storage lid 5 Elastic sealing material 51 Liquid sealing material

Claims (6)

収納ケースと収納蓋との間に電子回路基板を収納し、弾性シール材によって上記電子回路基板の防水を行う構造において、
上記電子回路基板は、基板本体と、当該電子回路基板の外部との電気信号の送受信を行うためのコネクタ部とを有しており、該コネクタ部は、上記基板本体から上記収納蓋側に向けて隆起すると共に該基板本体の側部から突出しており、
上記弾性シール材は、上記収納ケースと上記収容蓋とが対面する平面状対面部位と、上記コネクタ部と上記収容蓋とが対面する立体状対面部位とに連続した状態で、上記基板本体の周囲を一巡して施工した液状シール材料を硬化させてなり、
上記平面状対面部位と上記立体状対面部位とは、上記弾性シール材を圧縮させたときの弾性反発力によって密封してあり、
上記弾性シール材は、その断面の圧縮方向において、自然状態の厚みをT0、圧縮状態の厚みをT1としたときの圧縮率(T0−T1)/T0×100%が、20〜70%になる状態で圧縮してあることを特徴とする電子回路基板の防水構造。
In the structure for storing the electronic circuit board between the storage case and the storage lid and waterproofing the electronic circuit board by an elastic sealing material,
The electronic circuit board has a board body and a connector part for transmitting and receiving electrical signals to and from the outside of the electronic circuit board, and the connector part is directed from the board body to the storage lid side. And protrudes from the side of the substrate body,
The elastic sealing material is formed around the substrate body in a state where it is continuous with a planar facing portion where the storage case and the receiving lid face each other and a three-dimensional facing portion where the connector portion and the receiving lid face each other. The liquid sealing material that was applied in a round is cured,
The planar facing portion and the three-dimensional facing portion are sealed by an elastic repulsive force when the elastic sealing material is compressed,
In the compression direction of the cross section, the elastic sealing material has a compression ratio (T0−T1) / T0 × 100% of 20 to 70% when the natural thickness is T0 and the compressed thickness is T1. A waterproof structure for an electronic circuit board characterized by being compressed in a state.
請求項1において、上記弾性シール材は、上記収納ケースと上記コネクタ部とが対面する平面状対面部位にも設けてあることを特徴とする電子回路基板の防水構造。   2. The waterproof structure for an electronic circuit board according to claim 1, wherein the elastic sealing material is also provided in a planar facing portion where the storage case and the connector portion face each other. 請求項1又は2において、上記電子回路基板は、車両のエンジンの制御を行うエンジン制御回路基板であることを特徴とする電子回路基板の防水構造。   3. The waterproof structure for an electronic circuit board according to claim 1, wherein the electronic circuit board is an engine control circuit board for controlling a vehicle engine. 請求項1〜3のいずれか一項において、上記弾性シール材は、シリコーン系樹脂からなることを特徴とする電子回路基板の防水構造。   The waterproof structure for an electronic circuit board according to claim 1, wherein the elastic sealing material is made of a silicone-based resin. 請求項4において、上記シリコーン系樹脂は、独立気泡を有する発泡体であることを特徴とする電子回路基板の防水構造。   5. The waterproof structure for an electronic circuit board according to claim 4, wherein the silicone-based resin is a foam having closed cells. 請求項1〜3のいずれか一項において、上記弾性シール材は、アクリル系樹脂からなることを特徴とする電子回路基板の防水構造。   The waterproof structure for an electronic circuit board according to claim 1, wherein the elastic sealing material is made of an acrylic resin.
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JP2010204153A (en) * 2009-02-27 2010-09-16 Canon Inc Process cartridge, image forming apparatus and sealing method
US8687374B2 (en) 2010-03-24 2014-04-01 Hitachi Automotive Systems, Ltd. Electronic controller for vehicle
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JP2012255381A (en) * 2011-06-09 2012-12-27 Mitsubishi Heavy Ind Ltd Electric compressor
JP2013089878A (en) * 2011-10-20 2013-05-13 Denso Corp Electronic device
JP2013120849A (en) * 2011-12-07 2013-06-17 Denso Corp Electronic apparatus
JP2014086682A (en) * 2012-10-26 2014-05-12 Denso Corp Housing case and manufacturing method thereof
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