JP4651732B1 - スパークプラグ - Google Patents
スパークプラグ Download PDFInfo
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- JP4651732B1 JP4651732B1 JP2009221067A JP2009221067A JP4651732B1 JP 4651732 B1 JP4651732 B1 JP 4651732B1 JP 2009221067 A JP2009221067 A JP 2009221067A JP 2009221067 A JP2009221067 A JP 2009221067A JP 4651732 B1 JP4651732 B1 JP 4651732B1
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 176
- 239000012212 insulator Substances 0.000 claims abstract description 100
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 239000011148 porous material Substances 0.000 claims description 11
- 239000007791 liquid phase Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 abstract description 61
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 133
- 150000001875 compounds Chemical class 0.000 description 94
- 229910052751 metal Inorganic materials 0.000 description 80
- 239000002184 metal Substances 0.000 description 80
- 239000011575 calcium Substances 0.000 description 69
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 54
- 239000011777 magnesium Substances 0.000 description 48
- 230000008859 change Effects 0.000 description 44
- 238000002485 combustion reaction Methods 0.000 description 26
- 239000002245 particle Substances 0.000 description 25
- 239000011521 glass Substances 0.000 description 24
- 239000000523 sample Substances 0.000 description 24
- 239000012071 phase Substances 0.000 description 20
- 230000002093 peripheral effect Effects 0.000 description 18
- 238000005245 sintering Methods 0.000 description 18
- 239000000446 fuel Substances 0.000 description 17
- 238000010304 firing Methods 0.000 description 16
- 238000007654 immersion Methods 0.000 description 15
- 229910052761 rare earth metal Inorganic materials 0.000 description 15
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
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- 150000002500 ions Chemical class 0.000 description 6
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- 229910000510 noble metal Inorganic materials 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 235000021317 phosphate Nutrition 0.000 description 5
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
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- 229910021193 La 2 O 3 Inorganic materials 0.000 description 2
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- 229910052791 calcium Inorganic materials 0.000 description 2
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- -1 rare earth compound Chemical class 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 241000978776 Senegalia senegal Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
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- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
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- 230000000052 comparative effect Effects 0.000 description 1
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- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 229910052706 scandium Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/38—Selection of materials for insulation
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- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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Abstract
【解決手段】略筒状に形成され、軸線方向に貫通する貫通孔6を有する絶縁体2と、貫通孔6に挿設された中心電極3とを備えたスパークプラグ100であって、前記絶縁体2は、Si成分とBa成分とCa成分とMg成分とを下記条件(1)及び(2)を満足するように含有し、B成分を実質的に無含有であるアルミナ基焼結体で形成されてなることを特徴とするスパークプラグ100。
条件(1):Si成分の酸化物換算質量に対するCa成分の酸化物換算質量の割合RCaが0.05〜0.40、条件(2):Si成分の酸化物換算質量、Ca成分の酸化物換算質量及びMg成分の酸化物換算質量の合計質量に対するMg成分の酸化物換算質量の割合RMgが0.01〜0.08
【選択図】 図1
Description
(a)前記鏡面研磨面を面積率で100%とした場合の前記気孔の面積率が4%以下である。
(b)前記気孔の最大長径Dmaxが15μm以下である。
(c)前記気孔の各長径(単位;μm)を確率変数とした場合の面積分布を対数正規分布で表示した際の標準偏差σが2μm以下である。」が記載されている。
前記絶縁体は、Si成分とBa成分とCa成分とMg成分とを、下記条件(1)及び(2)を満足するように、含有し、B成分を実質的に無含有であり、下記条件(3)を満足するアルミナ基焼結体で形成されてなることを特徴とする。
条件(1):前記Si成分の質量(酸化物換算)に対する前記Ca成分の質量(酸化物換算)の割合RCaが0.1〜0.2
条件(2):前記Si成分の質量(酸化物換算)、前記Ca成分の質量(酸化物換算)及び前記Mg成分の質量(酸化物換算)の合計質量に対する前記Mg成分の質量(酸化物換算)の割合RMgが0.01〜0.08
条件(3):前記アルミナ基焼結体は、その全質量に対する液相量の質量(酸化物換算)の質量割合R G が6.2〜10.0質量%
条件(1):前記Si成分の質量(酸化物換算)に対する前記Ca成分の質量(酸化物換算)の割合RCaが0.05〜0.40
条件(2):前記Si成分の質量(酸化物換算)、前記Ca成分の質量(酸化物換算)及び前記Mg成分の質量(酸化物換算)の合計質量に対する前記Mg成分の質量(酸化物換算)の割合RMgが0.01〜0.08
条件(3):前記Si化合物粉末の質量(酸化物換算)に対する質量(酸化物換算)の割合RCaが0.05〜0.40
条件(4):前記Si化合物粉末の質量(酸化物換算)、前記Ca化合物粉末の質量(酸化物換算)及び前記Mg化合物粉末の質量(酸化物換算)の合計質量に対する前記Mg化合物粉末の質量(酸化物換算)の割合RMgが0.01〜0.08
条件(5):前記Al化合物粉末の質量(酸化物換算)、前記Si化合物粉末の質量(酸化物換算)、Ba化合物粉末の質量(酸化物換算)、前記Ca化合物粉末の質量(酸化物換算)及び前記Mg化合物粉末の質量(酸化物換算)の合計質量が100質量%
アルミナ粉末とSi化合物粉末と第2族元素化合物粉末としてCa化合物粉末、Mg化合物粉末及びBa化合物粉末と所望によりB化合物粉末(試料番号19)又はLa2O3粉末(試料番号5)との原料粉末(混合した各粉末の種類を第1表に示す。)に親水性結合剤を添加してスラリーを調製した。なお、前記Si化合物粉末及び前記第2族元素化合物粉末の平均粒径D50は前記範囲内にあった。
得られたアルミナ基焼結体それぞれの組成すなわち各成分の含有率を、エネルギー分散型マイクロアナライザー(EPMA/EDS)を用いた定量分析によって、検出された各成分の酸化物換算質量の合計を100質量%としたときの質量割合(%)として算出した。エネルギー分散型マイクロアナライザー(EPMA/EDS)の分析条件は、フィールドエミッション電子プローブマイクロアナライザ(JXA−8500F、日本電子株式会社製)を用いてスポット径φ200、加速電圧20kVに設定し、10個所測定したときの算出平均値とした。その結果を「組成(酸化物換算質量%)」として第1表に示す。また、各成分の含有率から、前記質量割合RCa及び前記質量割合RMgをそれぞれ算出してその結果を第1表に示す。さらに、Si成分、Ca成分、Mg成分、Ba成分、La2O3成分及びB成分(試料番号19)の含有率の合計含有率を合算し、その結果を「質量割合Rg」として第1表に示す。なお、第1表に示される各成分の含有率は前記原料粉末における混合割合とほぼ一致していた。また、得られたアルミナ基焼結体それぞれの前記面積割合(S4/S)を前記方法により測定又は算出した結果を第1表に示す。
各アルミナ基焼結体におけるCa成分及びSi成分の酸化物換算質量を算出し、常温における濃塩酸に10分間浸漬した後に濃塩酸から取り出した。この浸漬後のアルミナ基焼結体それぞれをEPMA/EDSを用いて前記と同様にして定量成分し、常温における濃塩酸浸漬後のアルミナ基焼結体におけるCa成分及びSi成分の酸化物換算質量を算出した。常温における濃塩酸に浸漬後のCa成分及びSi成分の合計質量(酸化物換算質量)W2と、常温における濃塩酸に浸漬する前のCa成分及びSi成分の合計質量(酸化物換算質量)W1とから、前記式に基づいて各アルミナ基焼結体における「常温における濃塩酸への10分間浸漬前後のCa成分及びSi成分の質量変化率(%)」を算出し、第1表に「質量変化率(%)」として示す。
試料番号3、4、6及び10〜13の各アルミナ基焼結体における3点曲げ強度S1を前記方法に準拠して測定した。次いで、同様にして製造した試料番号3、4、6及び10〜13の各アルミナ基焼結体を常温における濃塩酸に10分間浸漬した後に濃塩酸から取り出し、同様にして3点曲げ強度S2を測定した。同じ試料番号のアルミナ基焼結体において、常温における濃塩酸に浸漬後の3点曲げ強度S2と常温における濃塩酸に浸漬する前の3点曲げ強度S1とから、前記式に基づいてアルミナ基焼結体における「濃塩酸への10分間浸漬前後の強度変化率(%)」を算出し、その結果を図3に示す。
前記アルミナ基焼結体の製造と基本的に同様にして、図4(b)に示される耐電圧測定用絶縁体70をそれぞれ製造した。この耐電圧測定用絶縁体70は、その軸線方向の中心部に軸孔を備えていると共に軸孔の先端部は閉じた状態と成っている。この耐電圧測定用絶縁体70それぞれを用いて高温下における耐電圧を測定した。耐電圧を測定する装置を図4に示す。図4(a)は耐電圧測定用絶縁体70と耐電圧測定用絶縁体70の先端近傍を囲繞する金属製のリング71とを俯瞰した図であり、図4(b)は耐電圧測定用絶縁体70と前記リング31との断面図である。リング71は、その軸線長さLが3〜4mmであり、図示しない固定手段によって耐電圧測定用絶縁体70の先端近傍に固定されている。耐電圧測定用絶縁体70は、基部72により一端部が固定され、他端部が基部72から突出している。前記軸孔には中心電極Dが挿入配置されている。この高温下での耐電圧評価は、耐電圧測定用絶縁体70の基部72から突出した部位を600〜950℃に高周波加熱し、耐電圧測定用絶縁体70における加熱され易い金属製のリング31に近接した部位が800℃、850℃及び900℃の所定温度に達した状態において、中心電極Dとリング31との間に電圧を印加し、耐電圧測定用絶縁体70に絶縁破壊が発生したときの電圧値を耐電圧値として測定することとした。測定した各耐電圧値を第1表に示す。
試料番号2〜10、22〜26及び28〜38のアルミナ基焼結体の製造と基本的に同様にして絶縁体2をそれぞれ製造し、これらの絶縁体2を用いて前記のようにして各スパークプラグを製造した。製造した各スパークプラグは、絶縁体2と同様に、耐酸性及び高温耐電圧特性に優れていた。
1 主体金具
2 絶縁体
3 中心電極
4 接地電極
6 貫通孔
7 取付ネジ部
29 脚長基部
30 脚長部(絶縁体縮径部)
56 係合凸部(主体金具基部)
g 火花放電間隙
S 基部間隙
Claims (2)
- 軸線方向に貫通する貫通孔を有すると共に略筒状に形成された絶縁体と、前記貫通孔に挿設された中心電極とを備えたスパークプラグであって、
前記絶縁体は、Si成分とBa成分とCa成分とMg成分とを、下記条件(1)及び(2)を満足するように、含有し、B成分を実質的に無含有であり、下記条件(3)を満足するアルミナ基焼結体で形成されてなることを特徴とするスパークプラグ。
条件(1):前記Si成分の質量(酸化物換算)に対する前記Ca成分の質量(酸化物換算)の割合RCaが0.1〜0.2
条件(2):前記Si成分の質量(酸化物換算)、前記Ca成分の質量(酸化物換算)及び前記Mg成分の質量(酸化物換算)の合計質量に対する前記Mg成分の質量(酸化物換算)の割合RMgが0.01〜0.08
条件(3):前記アルミナ基焼結体は、その全質量に対する液相量の質量(酸化物換算)の質量割合R G が6.2〜10.0質量% - 前記アルミナ基焼結体は、その鏡面研磨面における250μm×190μmの領域を倍率500倍で観察したときに、観察領域の面積Sに対する、観察領域内に存在する円相当直径が4μm以上の気孔の合計面積S4の面積割合(S4/S)が0〜1.0%であることを特徴とする請求項1に記載のスパークプラグ。
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JP2009221067A JP4651732B1 (ja) | 2009-09-25 | 2009-09-25 | スパークプラグ |
BR112012006689A BR112012006689A2 (pt) | 2009-09-25 | 2010-06-23 | vela de ignição |
KR1020127007736A KR20120087907A (ko) | 2009-09-25 | 2010-06-23 | 스파크 플러그 |
PCT/JP2010/004163 WO2011036833A1 (ja) | 2009-09-25 | 2010-06-23 | スパークプラグ |
US13/497,816 US20120176022A1 (en) | 2009-09-25 | 2010-06-23 | Spark plug |
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Cited By (2)
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US9362722B2 (en) | 2012-02-27 | 2016-06-07 | Ngk Spark Plug Co., Ltd. | Spark plug with improved withstand voltage characteristics and high mechanical strength at high temperatures |
CN106981825A (zh) * | 2015-09-24 | 2017-07-25 | 日本特殊陶业株式会社 | 火花塞 |
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JP5600711B2 (ja) | 2012-08-28 | 2014-10-01 | 日本特殊陶業株式会社 | スパークプラグ |
JP5775544B2 (ja) * | 2013-05-09 | 2015-09-09 | 日本特殊陶業株式会社 | 点火プラグ用絶縁体及び点火プラグ |
JP6366555B2 (ja) * | 2015-09-24 | 2018-08-01 | 日本特殊陶業株式会社 | スパークプラグ |
JP6369837B2 (ja) * | 2015-09-24 | 2018-08-08 | 日本特殊陶業株式会社 | スパークプラグ |
JP6546624B2 (ja) * | 2017-06-27 | 2019-07-17 | 日本特殊陶業株式会社 | スパークプラグ |
JP6843809B2 (ja) | 2018-10-03 | 2021-03-17 | 日本特殊陶業株式会社 | スパークプラグ |
WO2023008300A1 (ja) * | 2021-07-27 | 2023-02-02 | 日本特殊陶業株式会社 | 絶縁体およびスパークプラグ |
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JPH05190255A (ja) * | 1992-01-16 | 1993-07-30 | Nippon Light Metal Co Ltd | 窒化アルミニウム製点火プラグ用絶縁碍子 |
JPH1143368A (ja) * | 1997-05-29 | 1999-02-16 | Ngk Spark Plug Co Ltd | アルミナセラミックとスパークプラグ用絶縁碍子 |
JP4807711B2 (ja) * | 1999-02-23 | 2011-11-02 | 日本特殊陶業株式会社 | スパークプラグの絶縁碍子用アルミナ基焼結体 |
JP4544597B2 (ja) * | 2000-05-01 | 2010-09-15 | 日本特殊陶業株式会社 | スパークプラグ |
WO2005033041A1 (ja) * | 2003-10-03 | 2005-04-14 | Nippon Soken, Inc. | アルミナ質磁器組成物およびそれを用いたスパークプラグ |
JP4690230B2 (ja) * | 2006-03-16 | 2011-06-01 | 日本特殊陶業株式会社 | 内燃機関用スパークプラグ及びその製造方法 |
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Cited By (3)
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US9362722B2 (en) | 2012-02-27 | 2016-06-07 | Ngk Spark Plug Co., Ltd. | Spark plug with improved withstand voltage characteristics and high mechanical strength at high temperatures |
CN106981825A (zh) * | 2015-09-24 | 2017-07-25 | 日本特殊陶业株式会社 | 火花塞 |
CN106981825B (zh) * | 2015-09-24 | 2019-08-06 | 日本特殊陶业株式会社 | 火花塞 |
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KR20120087907A (ko) | 2012-08-07 |
BR112012006689A2 (pt) | 2016-05-10 |
JP2011070929A (ja) | 2011-04-07 |
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