WO2014185390A1 - Gasket for electronic device - Google Patents

Gasket for electronic device Download PDF

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Publication number
WO2014185390A1
WO2014185390A1 PCT/JP2014/062652 JP2014062652W WO2014185390A1 WO 2014185390 A1 WO2014185390 A1 WO 2014185390A1 JP 2014062652 W JP2014062652 W JP 2014062652W WO 2014185390 A1 WO2014185390 A1 WO 2014185390A1
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WO
WIPO (PCT)
Prior art keywords
gasket
substrates
fastening
electronic device
width
Prior art date
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PCT/JP2014/062652
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French (fr)
Japanese (ja)
Inventor
元 由井
佐々木　憲司
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Nok株式会社
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Publication date
Application filed by Nok株式会社 filed Critical Nok株式会社
Priority to JP2015517078A priority Critical patent/JP6339999B2/en
Publication of WO2014185390A1 publication Critical patent/WO2014185390A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • F16J15/106—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure homogeneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/20—Light-sensitive devices
    • H01G9/2068—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells
    • H01G9/2077—Sealing arrangements, e.g. to prevent the leakage of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/542—Dye sensitized solar cells

Definitions

  • the present invention relates to a sealing technique for an electronic device having a structure in which an encapsulating substance such as an electrolyte is interposed between substrates.
  • the present invention relates to a gasket that can be used as a sealing means for sealing gas between opposing substrates of a display.
  • the dye-sensitized solar cell has an advantage that the manufacturing cost is lower than that of a silicon (Si) pn junction solar cell. Since this type of dye-sensitized solar cell has a structure in which a liquid or gel electrolyte is sealed between two electrode substrates, the sealing performance of the gasket for sealing the electrolyte and the resistance to the electrolyte are high. Improvement is important in the reliability and durability of the dye-sensitized solar cell.
  • the dye-sensitized solar cell has a pair of transparent substrates 101 and 102 arranged to face each other as shown in an example of the basic structure in FIG.
  • a transparent electrode 103 made of a transparent conductive film is formed on a surface facing the transparent substrate 102, and a porous electrode made of titanium oxide (TiO 2 ) particles 104a having a photosensitizing dye 104b adsorbed on the transparent electrode 103.
  • TiO 2 titanium oxide
  • a semiconductor layer 104 is provided, and a counter electrode 105 made of a transparent conductive film and a catalyst layer is formed on a surface of the other transparent substrate 102 facing the one transparent substrate 101, and the porous semiconductor layer 104 and the counter electrode
  • a liquid or gel electrolyte 106 containing, for example, iodine and iodide is enclosed in a sealed gap defined between the liquid crystal 105 and the air gap 105.
  • This type of dye-sensitized solar cell generates electricity by the following operation.
  • the light such as hitting first sunlight transparent substrate 101
  • the photosensitizing dye 104b absorbs light electrons e - to release, the emitted electrons e - titanium oxide particles 104a
  • the electrode moves to the transparent electrode 103 and reaches the counter electrode 105 via the external load R.
  • the oxidized triiodide ion I 3 ⁇ diffuses to the counter electrode 105 and is reduced by receiving an electron e ⁇ from the counter electrode 105 to become iodide ion I ⁇ .
  • the reduced iodide ion I ⁇ is oxidized again by the photosensitizing dye 104b.
  • an adhesive such as a UV curable adhesive has been mainly used as a sealing material for sealing the electrolyte 106 interposed between the outer peripheral portions of the transparent substrates 101 and 102 (Patent Document 1 below). reference).
  • a sealing material using a UV curable adhesive may swell or deteriorate due to contact with the electrolyte 106 over a long period of time, and the sealing performance may be reduced. As a result, the electrolyte 106 may leak, If the electrolyte 106 is deteriorated by water vapor transmitted from the outside, there is a problem that not only the photoelectric conversion efficiency is lowered, but also the reliability and durability of the dye-sensitized solar cell are remarkably lowered.
  • the substrates 101 and 102 are bonded to each other by a sealing material made of a UV curable adhesive, there is a problem that they cannot be disassembled and have poor maintainability.
  • the gap between the transparent substrates 101 and 102 is very small, that is, the gasket 107 is very thin with a rubber thickness on the order of ⁇ m. Since 101 and 102 are made of a glass substrate, the transparent substrates 101 and 102 may be damaged by the compression reaction force of the gasket 107 unless the fastening force by the bolt 108 and the nut 108a is reduced.
  • the gasket 107 is necessary for sealing in the vicinity 107a of the bolts / nuts 108, 108a shown in FIG.
  • the fastening force is reduced due to slight bending of the transparent substrates 101 and 102.
  • the gasket 107 and the transparent substrate 101 are reduced. , 102 may be formed, and the surface pressure required for sealing may not be ensured.
  • gaskets used in electronic devices such as the above-described dye-sensitized solar cells are very thin with a thickness of the order of ⁇ m, only a flat surface (plane) is used for space saving. Since it is necessary to ensure the surface pressure, it is difficult to provide a bead like the metal gasket described in Patent Documents 3 and 4.
  • the present invention has been made in view of the above points, and its technical problem is that a thin gasket used for an electronic device such as a dye-sensitized solar cell requires a small fastening force. It is to secure the pressure.
  • an electronic device gasket according to the invention of claim 1 is enclosed between a pair of substrates which are arranged to face each other and are connected to each other by a plurality of fastening members.
  • An electronic device having a structure in which a substance is encapsulated, wherein the gasket is interposed between the pair of substrates and seals the periphery of the encapsulated substance, and has a constant thickness and is relatively near the fastening member.
  • the contact width is gradually different in the circumferential direction so that the width becomes relatively narrower as the distance from the fastening member increases.
  • the gasket interposed between the pair of substrates facing each other has a smaller contact width with the substrate as the distance from the fastening member increases, so that the compression reaction force of the gasket decreases between the fastening positions of the fastening members. .
  • the bending of the substrate due to the compression reaction force of the gasket between the fastening positions by the fastening member is suppressed, and as a result, the fastening member can secure the surface pressure only by a flat surface (plane). Since the reduction of the compression amount of the gasket between the fastening positions due to is suppressed and the reduction of the surface pressure at the position away from the fastening member is suppressed, the variation in the surface pressure of the gasket is reduced.
  • the substrate is prevented from being damaged or deformed by the compression reaction force of the gasket between the fastening positions of the fastening members, and the surface pressure necessary for sealing is ensured even with a small fastening force. be able to.
  • FIG. 1 is a separated perspective view of a substrate and a gasket schematically showing a preferred embodiment of a gasket for electronic devices according to the present invention. It is a top view of the use condition which shows schematically a desirable embodiment of a gasket for electronic devices concerning the present invention. It is explanatory drawing which shows roughly an example of the basic structure of a dye-sensitized solar cell as an electronic device. It is a top view which shows roughly an example of the conventional gasket for electronic devices.
  • the electronic device shown in FIGS. 1 and 2 is, for example, a dye-sensitized solar cell.
  • Reference numerals 1 and 2 are substrates whose planar projection shapes are substantially rectangular, and are arranged to face each other in the thickness direction.
  • One of the substrates 1 is a transparent substrate made of glass, a transparent electrode made of a transparent conductive film formed on the inner surface thereof, and titanium oxide provided on the transparent electrode and adsorbing a photosensitizing dye.
  • the other substrate 2 has a laminated structure in which a counter electrode made of a transparent conductive film and a catalyst layer is formed on the inner surface.
  • the substrates 1 and 2 are fastened to each other by screw members (for example, bolts and nuts) 3 near the corners.
  • the screw member 3 corresponds to the fastening member described in claim 1.
  • a substance M such as a liquid or gel electrolyte containing iodine and iodide is sealed between the substrates 1 and 2, and the periphery thereof is sealed with the gasket 4 according to the present invention.
  • the gasket 4 is disposed inside the fastening position by the screw member 3, and the planar shape forms a rounded rectangular shape.
  • this gasket 4 has a barrier property against water vapor and is inert to the electrolyte, preferably a metal foil (for example, aluminum foil) having a thickness of about 60 ⁇ m or an LCP (liquid crystal polymer: for example, Primer Co., Ltd.).
  • EPDM ethylene propylene diene rubber
  • VMQ vinyl methyl
  • a gasket body 42 integrally formed of a fluorine-based synthetic resin material (PTFE, Saran, etc.).
  • the gasket main body 42 is in intimate contact with the inner surfaces of the substrates 1 and 2, and a liquid rubber is applied in a thin film on both surfaces of the frame-like base material 41 by a screen printing method or the like. It is formed with a constant thickness of about 50 ⁇ m. Further, the gasket body 42 has a flat contact surface with the substrates 1 and 2 and is relatively wide at the corner portion 42a passing near the inside of the fastening position by the screw member 3, and between the corner portions 42a and 42a. The width continuously changes so that the width becomes relatively narrow at the side portion 42b.
  • the width is wide in the vicinity of the fastening position by the screw member 3, and the width is narrower as it is farther from the fastening position, that is, the narrowest at the intermediate position in the longitudinal direction of the side portion 42b.
  • the width continuously changes so that the maximum width dimension at the corner portion 42a is, for example, 8.5 mm, and the minimum width dimension at the side portion 42b is, for example, 2 mm.
  • the gasket body 42 is formed so that the outer peripheral edge 42c forms a rectangle with rounded corners, while the inner peripheral edge 42d has a shape in which each side of the rectangle with rounded corners is curved in an arc shape. Yes. Further, the inner peripheral edge of the frame-like base material 41 of the gasket 4 is also formed in the same shape as the inner peripheral edge 42 d of the gasket body 42.
  • the gasket main body 42 on both surfaces of the frame-like base material 41 is in close contact with the substrates 1 and 2 to enclose liquid or gel electrolyte enclosed between the substrates 1 and 2.
  • the substance M is prevented from leaking outside.
  • the gasket 4 has the widest contact width with the substrates 1 and 2 in the vicinity of the fastening position by the screw member 3 (corner portion 42a) and the narrowest at the intermediate position in the longitudinal direction of the side portion 42b.
  • the compression reaction force of the gasket 4 (gasket main body 42) caused by being clamped between the fastening substrates 1 and 2 by the fastening force of the member 3 is also smallest at the intermediate position in the longitudinal direction of the side portion 42b.
  • the compression reaction force of the gasket 4 (gasket body 42) is suppressed between the fastening positions by the screw member 3, thereby preventing the substrates 1 and 2 from being damaged, and even with a small fastening force,
  • the surface pressure required for sealing can be secured, and as a result, the number of screw members 3 can be reduced.
  • the surface pressure on the substrates 1 and 2 is almost uniform over the entire circumference. can do.
  • the electronic device is a dye-sensitized solar cell.
  • the gasket 4 of the present invention the electronic device is enclosed between opposing substrates of, for example, an organic EL (electroluminescence) display. It can also be applied as a gas sealing means.
  • the inner peripheral edge has a curved shape, but the contact width gradually increases in the circumferential direction even if the outer peripheral edge has a curved shape, or both the inner peripheral edge and the outer peripheral edge have a curved shape. Different shapes can be realized.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Photovoltaic Devices (AREA)
  • Hybrid Cells (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The purpose of the present invention is to secure the necessary surface pressure with a small fastening force for a thin gasket used for an electronic device such as a dye sensitized solar cell. To achieve this purpose, provided is a gasket (4) which is placed between a pair of substrates (1, 2) to seal around a sealed substance (M) in an electronic device having a structure where the sealed substance (M) is sealed between the pair of substrates (1, 2) arranged opposite each other and mutually coupled with a plurality of fastening members (3), wherein the gasket has a constant thickness and is formed in a shape so that the contact width with respect to the substrates (1, 2) changes gradually in the circumferential direction to have a relatively wide width near the fastening members (3) and a relatively narrower width away from the fastening members (3).

Description

電子デバイス用ガスケットGasket for electronic devices
　本発明は、基板間に電解質等の封入物質を介在させて封止した構造の電子デバイスの封止技術に係り、例えば色素増感型太陽電池の対向電極間の電解質や有機ＥＬ（エレクトロルミネッセンス）ディスプレイの対向基板間の封入ガスの封止手段として適用可能なガスケットに関するものである。 The present invention relates to a sealing technique for an electronic device having a structure in which an encapsulating substance such as an electrolyte is interposed between substrates. The present invention relates to a gasket that can be used as a sealing means for sealing gas between opposing substrates of a display.
　色素増感型太陽電池は、シリコン（Si）のｐｎ接合型の太陽電池に比較して製造コストが安いという利点がある。この種の色素増感型太陽電池は、２枚の電極基板間に液状又はゲル状の電解質が封入された構造を有するため、この電解液を封止するガスケットの封止性能や電解質に対する耐性の向上が、色素増感型太陽電池の信頼性や耐久性において重要である。 The dye-sensitized solar cell has an advantage that the manufacturing cost is lower than that of a silicon (Si) pn junction solar cell. Since this type of dye-sensitized solar cell has a structure in which a liquid or gel electrolyte is sealed between two electrode substrates, the sealing performance of the gasket for sealing the electrolyte and the resistance to the electrolyte are high. Improvement is important in the reliability and durability of the dye-sensitized solar cell.
　詳しくは、色素増感型太陽電池は、図３にその基本構造の一例を示すように、互いに対向配置された一対の透明基板１０１，１０２を有し、このうち一方の透明基板１０１における他方の透明基板１０２との対向面に透明な導電膜からなる透明電極１０３が形成されており、この透明電極１０３に、光増感色素１０４ｂを吸着させた酸化チタン（TiO２）粒子１０４ａからなる多孔質半導体層１０４が設けられ、他方の透明基板１０２における一方の透明基板１０１との対向面に透明な導電膜及び触媒層からなる対向電極１０５が形成されており、前記多孔質半導体層１０４と対向電極１０５との間に画成された密閉隙間には、例えばヨウ素及びヨウ化物を含有する液状又はゲル状の電解質１０６が封入されている。 Specifically, the dye-sensitized solar cell has a pair of transparent substrates 101 and 102 arranged to face each other as shown in an example of the basic structure in FIG. A transparent electrode 103 made of a transparent conductive film is formed on a surface facing the transparent substrate 102, and a porous electrode made of titanium oxide (TiO 2 ) particles 104a having a photosensitizing dye 104b adsorbed on the transparent electrode 103. A semiconductor layer 104 is provided, and a counter electrode 105 made of a transparent conductive film and a catalyst layer is formed on a surface of the other transparent substrate 102 facing the one transparent substrate 101, and the porous semiconductor layer 104 and the counter electrode A liquid or gel electrolyte 106 containing, for example, iodine and iodide is enclosed in a sealed gap defined between the liquid crystal 105 and the air gap 105.
　この種の色素増感型太陽電池は、次のような動作によって発電するものである。まず透明基板１０１に太陽光などの光が当たることによって、光増感色素１０４ｂが光を吸収することにより励起状態となって電子ｅ－を放出し、放出された電子ｅ－は酸化チタン粒子１０４ａを経て透明電極１０３へ移動し、さらに外部負荷Ｒを経由して、対向電極１０５に達する。一方、電子ｅ－を放出することにより酸化した光増感色素１０４ｂは、電解質１０６中のヨウ化物イオンＩ－から電子ｅ－を受け取ることによって元の状態に戻り、これによってヨウ化物イオンＩ－が酸化された三ヨウ化物イオンＩ３ －は、対向電極１０５まで拡散してここで対向電極１０５から電子ｅ－を受け取ることによって還元され、ヨウ化物イオンＩ－となる。還元されたヨウ化物イオンＩ－は、光増感色素１０４ｂによって再び酸化されることになる。そしてこのような酸化還元の繰り返しによって外部負荷Ｒを電流が流れるのである。 This type of dye-sensitized solar cell generates electricity by the following operation. By the light, such as hitting first sunlight transparent substrate 101, is excited by the photosensitizing dye 104b absorbs light electrons e - to release, the emitted electrons e - titanium oxide particles 104a Then, the electrode moves to the transparent electrode 103 and reaches the counter electrode 105 via the external load R. On the other hand, electrons e - photosensitizing dye 104b oxidized by releasing the iodide ions I in the electrolyte 106 - back to its original state by receiving, thereby iodide ion I - - electrons e from the The oxidized triiodide ion I 3 − diffuses to the counter electrode 105 and is reduced by receiving an electron e − from the counter electrode 105 to become iodide ion I − . The reduced iodide ion I − is oxidized again by the photosensitizing dye 104b. A current flows through the external load R by repeating such oxidation and reduction.
　透明基板１０１，１０２の外周部間に介在して電解質１０６を封止するシール材としては、従来、ＵＶ硬化型接着剤などの接着剤を用いるのが主流となっている（下記の特許文献１参照）。 Conventionally, an adhesive such as a UV curable adhesive has been mainly used as a sealing material for sealing the electrolyte 106 interposed between the outer peripheral portions of the transparent substrates 101 and 102 (Patent Document 1 below). reference).
　しかしながらＵＶ硬化型接着剤によるシール材は、長期にわたって電解質１０６と接触することにより、膨潤したり劣化したりして、封止性が低下するおそれがあり、その結果、電解質１０６が漏れたり、また、外部から透過した水蒸気によって電解質１０６が劣化したりすると、光電変換効率が低下するばかりか、色素増感型太陽電池の信頼性と耐久性が著しく低下するといった問題がある。しかも基板１０１，１０２がＵＶ硬化型接着剤からなるシール材によって互いに接着されてしまうので、分解不可能であり、メンテナンス性に乏しいという問題も指摘される。 However, a sealing material using a UV curable adhesive may swell or deteriorate due to contact with the electrolyte 106 over a long period of time, and the sealing performance may be reduced. As a result, the electrolyte 106 may leak, If the electrolyte 106 is deteriorated by water vapor transmitted from the outside, there is a problem that not only the photoelectric conversion efficiency is lowered, but also the reliability and durability of the dye-sensitized solar cell are remarkably lowered. In addition, since the substrates 101 and 102 are bonded to each other by a sealing material made of a UV curable adhesive, there is a problem that they cannot be disassembled and have poor maintainability.
　また、接着剤によるシール材の代わりに、電解質１０６によって膨潤したり劣化したりすることのないゴム系材料からなるガスケット１０７を用いることも考えられるが、この場合、ガスケット１０７に適度な圧縮を与えるためには、透明基板１０１，１０２を貫通したボルト１０８と、これに螺合したナット１０８ａによって締結する必要がある（下記の特許文献２参照）。 In addition, it is conceivable to use a gasket 107 made of a rubber-based material that does not swell or deteriorate with the electrolyte 106, instead of the sealing material using an adhesive. In this case, the gasket 107 is appropriately compressed. For this purpose, it is necessary to fasten with a bolt 108 penetrating the transparent substrates 101 and 102 and a nut 108a screwed on the bolt 108 (see Patent Document 2 below).
　ところが、透明基板１０１，１０２間の隙間は微小なものであり、すなわちガスケット１０７はゴムの厚みがμｍオーダーの非常に薄いものであることから、僅かな圧縮でも反力が増大し、しかも透明基板１０１，１０２はガラス基板からなるため、ボルト１０８とナット１０８ａによる締結力は小さくしないと、ガスケット１０７の圧縮反力によって透明基板１０１，１０２が破損してしまうおそれがある。 However, the gap between the transparent substrates 101 and 102 is very small, that is, the gasket 107 is very thin with a rubber thickness on the order of μm. Since 101 and 102 are made of a glass substrate, the transparent substrates 101 and 102 may be damaged by the compression reaction force of the gasket 107 unless the fastening force by the bolt 108 and the nut 108a is reduced.
　ところが、透明基板１０１，１０２の破損を防止するためにボルト・ナット１０８，１０８ａによる締結力を小さくすると、ガスケット１０７は、図４に示す各ボルト・ナット１０８，１０８ａの近傍１０７ａでは、密封に必要な面圧を確保できるが、各ボルト・ナット１０８，１０８ａの間の部分１０７ｂでは透明基板１０１，１０２の僅かな撓みなどの影響で締結力が低下し、極端な場合はガスケット１０７と透明基板１０１，１０２の間に隙間ができてしまい、密封に必要な面圧が確保できなくなるおそれがあった。 However, if the fastening force by the bolts / nuts 108, 108a is reduced in order to prevent the transparent substrates 101, 102 from being damaged, the gasket 107 is necessary for sealing in the vicinity 107a of the bolts / nuts 108, 108a shown in FIG. However, in the portion 107b between the bolts and nuts 108 and 108a, the fastening force is reduced due to slight bending of the transparent substrates 101 and 102. In an extreme case, the gasket 107 and the transparent substrate 101 are reduced. , 102 may be formed, and the surface pressure required for sealing may not be ensured.
　また、自動車エンジンのシリンダヘッドに用いられる金属ガスケットでは、ボルトによる締結部の間の部分の密封面圧を確保するための対策として、ボルトによる締結部の間の部分を厚くしたり（下記の特許文献３参照）、あるいはボルトによる締結部の間の部分のビード幅を広くかつビード高さを高くしたりすること（下記の特許文献４参照）が知られている。 Moreover, in the metal gasket used for the cylinder head of an automobile engine, as a measure for ensuring the sealing surface pressure of the portion between the bolted fastening portions, the portion between the bolted fastening portions is thickened (the following patents) It is known to widen the bead width and the bead height of the portion between the fastening portions using bolts (see Patent Document 4) (see Patent Document 4 below).
　しかしながら、上述のような色素増感型太陽電池などの電子デバイスに用いられるガスケットは、厚みがμｍオーダーの非常に薄いものであることから、省スペース化のためにフラットな面（平面）のみで面圧を確保する必要があるため、特許文献３，４に記載の金属ガスケットのようなビードを設けることは困難である。 However, since gaskets used in electronic devices such as the above-described dye-sensitized solar cells are very thin with a thickness of the order of μm, only a flat surface (plane) is used for space saving. Since it is necessary to ensure the surface pressure, it is difficult to provide a bead like the metal gasket described in Patent Documents 3 and 4.
特開２００７－０８７６８４号公報JP 2007-087684 A 特開２００６－２０２６８１号公報JP 2006-202681 A 特開平０８－０２８７０７号公報Japanese Patent Application Laid-Open No. 08-028707 国際公開ＷＯ２０１１／０２４８１２International Publication WO2011 / 024812
　本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、色素増感型太陽電池などの電子デバイスに用いられる薄肉のガスケットにおいて、小さな締結力で必要な面圧を確保することにある。 The present invention has been made in view of the above points, and its technical problem is that a thin gasket used for an electronic device such as a dye-sensitized solar cell requires a small fastening force. It is to secure the pressure.
　上述した技術的課題を有効に解決するための手段として、請求項１の発明に係る電子デバイス用ガスケットは、互いに対向配置されると共に複数の締結部材により互いに結合された一対の基板の間に封入物質が封入された構造の電子デバイスにおいて、前記一対の基板の間に介装されて前記封入物質の周囲を封止するガスケットであって、厚さが一定で、前記締結部材の近傍で相対的に幅が広く、前記締結部材から離れるほど相対的に幅が狭くなるように、周方向に接触幅が徐々に異なる形状に形成されたことを特徴とする。 As a means for effectively solving the technical problem described above, an electronic device gasket according to the invention of claim 1 is enclosed between a pair of substrates which are arranged to face each other and are connected to each other by a plurality of fastening members. An electronic device having a structure in which a substance is encapsulated, wherein the gasket is interposed between the pair of substrates and seals the periphery of the encapsulated substance, and has a constant thickness and is relatively near the fastening member. The contact width is gradually different in the circumferential direction so that the width becomes relatively narrower as the distance from the fastening member increases.
　上記構成において、互いに対向する一対の基板の間に介在するガスケットは、締結部材から離れるほど前記基板との接触幅が小さくなるので、締結部材による締結位置の間ではガスケットの圧縮反力が小さくなる。このため、締結部材による締結位置の間でのガスケットの圧縮反力による前記基板の撓みが抑制され、その結果、シール面がフラットな面（平面）のみで面圧を確保しつつも、締結部材による締結位置の間でのガスケットの圧縮量の減少が抑制され、締結部材から離れた位置での面圧の低下が抑制されるので、ガスケットの面圧のばらつきが小さくなる。 In the above configuration, the gasket interposed between the pair of substrates facing each other has a smaller contact width with the substrate as the distance from the fastening member increases, so that the compression reaction force of the gasket decreases between the fastening positions of the fastening members. . For this reason, the bending of the substrate due to the compression reaction force of the gasket between the fastening positions by the fastening member is suppressed, and as a result, the fastening member can secure the surface pressure only by a flat surface (plane). Since the reduction of the compression amount of the gasket between the fastening positions due to is suppressed and the reduction of the surface pressure at the position away from the fastening member is suppressed, the variation in the surface pressure of the gasket is reduced.
　本発明に係る電子デバイス用ガスケットによれば、締結部材による締結位置の間でのガスケットの圧縮反力による基板の破損や変形が防止され、小さな締結力でも、密封に必要な面圧を確保することができる。 According to the gasket for electronic devices according to the present invention, the substrate is prevented from being damaged or deformed by the compression reaction force of the gasket between the fastening positions of the fastening members, and the surface pressure necessary for sealing is ensured even with a small fastening force. be able to.
本発明に係る電子デバイス用ガスケットの好ましい実施の形態を概略的に示す基板とガスケットの分離斜視図である。1 is a separated perspective view of a substrate and a gasket schematically showing a preferred embodiment of a gasket for electronic devices according to the present invention. 本発明に係る電子デバイス用ガスケットの好ましい実施の形態を概略的に示す使用状態の平面図である。It is a top view of the use condition which shows schematically a desirable embodiment of a gasket for electronic devices concerning the present invention. 電子デバイスとして、色素増感型太陽電池の基本構造の一例を概略的に示す説明図である。It is explanatory drawing which shows roughly an example of the basic structure of a dye-sensitized solar cell as an electronic device. 従来の電子デバイス用ガスケットの一例を概略的に示す平面図である。It is a top view which shows roughly an example of the conventional gasket for electronic devices.
　以下、本発明に係る電子デバイス用ガスケットの好ましい実施の形態について、図１及び図２を参照しながら説明する。 Hereinafter, preferred embodiments of the gasket for electronic devices according to the present invention will be described with reference to FIGS. 1 and 2.
　図１及び図２に示す電子デバイスは、例えば色素増感型太陽電池であって、参照符号１，２は平面投影形状が略長方形をなす基板であり、厚さ方向に互いに対向配置されている。このうち一方の基板１は、ガラスからなる透明基板と、その内側面に形成された透明な導電膜からなる透明電極と、さらにこの透明電極に設けられ、光増感色素を吸着させた酸化チタン粒子からなる多孔質半導体層からなる積層構造となっており、他方の基板２は、内側面に透明な導電膜及び触媒層からなる対向電極が形成された積層構造となっているものである。この基板１，２は、各角部近傍がそれぞれ螺子部材（例えばボルト・ナット）３によって互いに締結されている。なお、螺子部材３は請求項１に記載された締結部材に相当する。 The electronic device shown in FIGS. 1 and 2 is, for example, a dye-sensitized solar cell. Reference numerals 1 and 2 are substrates whose planar projection shapes are substantially rectangular, and are arranged to face each other in the thickness direction. . One of the substrates 1 is a transparent substrate made of glass, a transparent electrode made of a transparent conductive film formed on the inner surface thereof, and titanium oxide provided on the transparent electrode and adsorbing a photosensitizing dye. The other substrate 2 has a laminated structure in which a counter electrode made of a transparent conductive film and a catalyst layer is formed on the inner surface. The substrates 1 and 2 are fastened to each other by screw members (for example, bolts and nuts) 3 near the corners. The screw member 3 corresponds to the fastening member described in claim 1.
　基板１，２の間には、ヨウ素及びヨウ化物を含有する液状又はゲル状の電解質などの物質Ｍが封入され、その周囲は本発明によるガスケット４によって封止される。このガスケット４は、螺子部材３による締結位置の内側に配置され、平面形状が角丸め長方形状をなすものである。 A substance M such as a liquid or gel electrolyte containing iodine and iodide is sealed between the substrates 1 and 2, and the periphery thereof is sealed with the gasket 4 according to the present invention. The gasket 4 is disposed inside the fastening position by the screw member 3, and the planar shape forms a rounded rectangular shape.
　詳しくは、このガスケット４は、水蒸気に対するバリア性を有すると共に電解質に対して不活性の材料、好ましくは例えば厚さが60μｍ程度の金属箔（例えばアルミ箔）又はＬＣＰ（液晶ポリマー：例えば株式会社プライマテック製ＳＴＡＢＩＡＸなど）の薄板からなる枠状基材４１と、この枠状基材４１における基板１，２との対向面に、耐電解質性の高いＥＰＤＭ（エチレンプロピレンジエンゴム）又はＶＭＱ（ビニルメチルシリコーンゴム）等のゴム材や、フッ素系の合成樹脂材（ＰＴＦＥ，サランなど）によって一体的に形成されたガスケット本体４２と、からなる。 Specifically, this gasket 4 has a barrier property against water vapor and is inert to the electrolyte, preferably a metal foil (for example, aluminum foil) having a thickness of about 60 μm or an LCP (liquid crystal polymer: for example, Primer Co., Ltd.). EPDM (ethylene propylene diene rubber) or VMQ (vinyl methyl) having a high electrolyte resistance is provided on a surface of the frame-like base material 41 facing the substrates 1 and 2 and a frame-like base material 41 made of a thin plate of STABAX made by Tech. And a gasket body 42 integrally formed of a fluorine-based synthetic resin material (PTFE, Saran, etc.).
　ガスケット本体４２は、基板１，２の内側面に密接されるものであり、スクリーン印刷法などによって枠状基材４１の両面に液状ゴムを薄膜状に塗布して架橋硬化させることによって、例えば5～50μｍ程度の一定の厚さで形成されている。また、このガスケット本体４２は基板１，２との密接面が平面状であり、螺子部材３による締結位置の内側近傍を通るコーナー部４２ａで相対的に幅が広く、コーナー部４２ａ，４２ａ間の辺部４２ｂで相対的に幅が狭くなるように、幅が連続的に変化している。言い換えれば螺子部材３による締結位置の近傍で幅が広く、締結位置から離れるほど幅が狭く、すなわち辺部４２ｂの長さ方向中間位置で最も狭くなっている。具体例としては、コーナー部４２ａにおける最大幅寸法が例えば８．５ｍｍ、辺部４２ｂにおける最小幅寸法が例えば２ｍｍとなるように、幅が連続的に変化している。 The gasket main body 42 is in intimate contact with the inner surfaces of the substrates 1 and 2, and a liquid rubber is applied in a thin film on both surfaces of the frame-like base material 41 by a screen printing method or the like. It is formed with a constant thickness of about 50 μm. Further, the gasket body 42 has a flat contact surface with the substrates 1 and 2 and is relatively wide at the corner portion 42a passing near the inside of the fastening position by the screw member 3, and between the corner portions 42a and 42a. The width continuously changes so that the width becomes relatively narrow at the side portion 42b. In other words, the width is wide in the vicinity of the fastening position by the screw member 3, and the width is narrower as it is farther from the fastening position, that is, the narrowest at the intermediate position in the longitudinal direction of the side portion 42b. As a specific example, the width continuously changes so that the maximum width dimension at the corner portion 42a is, for example, 8.5 mm, and the minimum width dimension at the side portion 42b is, for example, 2 mm.
　このためガスケット本体４２は、外周縁４２ｃが角部を丸めた長方形をなす一方、内周縁４２ｄが、角部を丸めた長方形の各辺を円弧状に湾曲させた形状をなすように形成されている。また、ガスケット４の枠状基材４１の内周縁も、ガスケット本体４２の内周縁４２ｄと同一の形状に形成されている。 For this reason, the gasket body 42 is formed so that the outer peripheral edge 42c forms a rectangle with rounded corners, while the inner peripheral edge 42d has a shape in which each side of the rectangle with rounded corners is curved in an arc shape. Yes. Further, the inner peripheral edge of the frame-like base material 41 of the gasket 4 is also formed in the same shape as the inner peripheral edge 42 d of the gasket body 42.
　以上の構成を備えるガスケット４は、枠状基材４１の両面のガスケット本体４２が基板１，２に密接することによって、基板１，２の間に封入された液状又はゲル状の電解質などの封入物質Ｍが外部へ漏れるのを防止するものである。 In the gasket 4 having the above-described configuration, the gasket main body 42 on both surfaces of the frame-like base material 41 is in close contact with the substrates 1 and 2 to enclose liquid or gel electrolyte enclosed between the substrates 1 and 2. The substance M is prevented from leaking outside.
　そして、このガスケット４は、螺子部材３による締結位置の近傍（コーナー部４２ａ）で基板１，２に対する接触幅が最も広く、辺部４２ｂの長さ方向中間位置で最も狭くなっているため、螺子部材３の締結力によって締結基板１，２の間で挟圧されることによるガスケット４（ガスケット本体４２）の圧縮反力も、辺部４２ｂの長さ方向中間位置で最も小さくなる。このため、螺子部材３による締結位置の間での圧縮反力による基板１，２の撓みが小さくなり、その結果、螺子部材３の締結位置の間での圧縮量の減少が抑制され基板１，２に対する面圧の低下が抑制される。 The gasket 4 has the widest contact width with the substrates 1 and 2 in the vicinity of the fastening position by the screw member 3 (corner portion 42a) and the narrowest at the intermediate position in the longitudinal direction of the side portion 42b. The compression reaction force of the gasket 4 (gasket main body 42) caused by being clamped between the fastening substrates 1 and 2 by the fastening force of the member 3 is also smallest at the intermediate position in the longitudinal direction of the side portion 42b. For this reason, the bending of the board | substrates 1 and 2 by the compression reaction force between the fastening positions by the screw member 3 becomes small, As a result, the reduction | decrease in the compression amount between the fastening positions of the screw member 3 is suppressed, and the board | substrate 1, 2 is suppressed.
　したがって、螺子部材３による締結位置の間でガスケット４（ガスケット本体４２）の圧縮反力が抑制されることによって、基板１，２の破損が防止されると共に、小さな締結力でも、封入物質Ｍの密封に必要な面圧を確保することができ、ひいては螺子部材３の本数を低減することも可能となる。 Accordingly, the compression reaction force of the gasket 4 (gasket body 42) is suppressed between the fastening positions by the screw member 3, thereby preventing the substrates 1 and 2 from being damaged, and even with a small fastening force, The surface pressure required for sealing can be secured, and as a result, the number of screw members 3 can be reduced.
　また、ガスケット本体４２の各部の幅を、螺子部材３による締結位置の間での基板１，２の撓み量を勘案して求めることにより、基板１，２に対する面圧を全周でほぼ均一にすることができる。 Further, by obtaining the width of each part of the gasket main body 42 in consideration of the amount of bending of the substrates 1 and 2 between the fastening positions by the screw member 3, the surface pressure on the substrates 1 and 2 is almost uniform over the entire circumference. can do.
　なお、上述の実施の形態は、電子デバイスが色素増感型太陽電池である場合について説明したが、本発明のガスケット４は、電子デバイスが例えば有機ＥＬ（エレクトロルミネッセンス）ディスプレイの対向基板間の封入ガスの封止手段としても適用することができる。 In the above-described embodiment, the case where the electronic device is a dye-sensitized solar cell has been described. However, in the gasket 4 of the present invention, the electronic device is enclosed between opposing substrates of, for example, an organic EL (electroluminescence) display. It can also be applied as a gas sealing means.
　また、上述の実施の形態では、内周縁を湾曲形状としたが、外周縁を湾曲形状とすること、あるいは内周縁と外周縁の双方を湾曲形状とすることでも、周方向に接触幅が徐々に異なる形状を実現することができる。 In the above-described embodiment, the inner peripheral edge has a curved shape, but the contact width gradually increases in the circumferential direction even if the outer peripheral edge has a curved shape, or both the inner peripheral edge and the outer peripheral edge have a curved shape. Different shapes can be realized.
１，２　基板
３　螺子部材（締結部材）
４　ガスケット
４１　枠状基材
４２　ガスケット本体
４２ａ　コーナー部
４２ｂ　辺部 1, 2 Substrate 3 Screw member (fastening member)
4 Gasket 41 Frame-shaped base material 42 Gasket body 42a Corner part 42b Side part

Claims (1)

  1. 　互いに対向配置されると共に複数の締結部材により互いに結合された一対の基板の間に封入物質が封入された構造の電子デバイスにおいて、前記一対の基板の間に介装されて前記封入物質の周囲を封止するガスケットであって、厚さが一定で、前記締結部材の近傍で相対的に幅が広く、前記締結部材から離れるほど相対的に幅が狭くなるように、周方向に接触幅が徐々に異なる形状に形成されたことを特徴とする電子デバイス用ガスケット。 In an electronic device having a structure in which an encapsulating material is sealed between a pair of substrates that are arranged to face each other and are coupled to each other by a plurality of fastening members, the electronic device is interposed between the pair of substrates to surround the encapsulating material. A gasket to be sealed, the thickness of which is constant, the width of the contact is gradually increased in the circumferential direction so that the width is relatively wide in the vicinity of the fastening member, and the width is relatively narrowed away from the fastening member. An electronic device gasket characterized by being formed in different shapes.
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JP2017032035A (en) * 2015-07-30 2017-02-09 Ｋｙｂ株式会社 Seal structure and seal method
JP2020047804A (en) * 2018-09-20 2020-03-26 積水化学工業株式会社 Electric module and manufacturing method of electric module

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JP2007220606A (en) * 2006-02-20 2007-08-30 Dainippon Printing Co Ltd Dye-sensitized solar cell module
JP2008226553A (en) * 2007-03-09 2008-09-25 Electric Power Dev Co Ltd Seal part of dye-sensitized solar cell, and the dye-sensitized solar cell
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Publication number Priority date Publication date Assignee Title
JP2017032035A (en) * 2015-07-30 2017-02-09 Ｋｙｂ株式会社 Seal structure and seal method
JP2020047804A (en) * 2018-09-20 2020-03-26 積水化学工業株式会社 Electric module and manufacturing method of electric module

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