{"id":4722,"date":"2026-02-25T06:02:44","date_gmt":"2026-02-25T06:02:44","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4722"},"modified":"2026-02-25T06:02:48","modified_gmt":"2026-02-25T06:02:48","slug":"why-via-impedance-is-hard-to-control","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/ja\/why-via-impedance-is-hard-to-control\/","title":{"rendered":"\u30d3\u30a2\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u306e\u5236\u5fa1\u304c\u96e3\u3057\u3044\u7406\u7531"},"content":{"rendered":"

\u79c1\u305f\u3061\u306fPCB\u30b7\u30e7\u30c3\u30d7\u306b\u884c\u3063\u3066\u5c0b\u306d\u305f\uff1a\u300c\u30c8\u30ec\u30fc\u30b9\u30fb\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u309210%\u4ee5\u5185\u306b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3067\u304d\u307e\u3059\u304b\uff1f\u5f7c\u3089\u306f\u81ea\u4fe1\u6e80\u3005\u3067\u3053\u3046\u7b54\u3048\u308b\u3060\u308d\u3046\uff1a\u300c\u554f\u984c\u3042\u308a\u307e\u305b\u3093\uff01\u300d\u3002\u3061\u3087\u3063\u3068\u7121\u7406\u3092\u3057\u30668%\u3092\u8981\u6c42\u3059\u308c\u3070\u3001\u5c11\u3057\u8003\u3048\u3066\u304b\u3089\u3053\u3046\u8a00\u3046\u304b\u3082\u3057\u308c\u306a\u3044\uff1a\u300c\u30aa\u30fc\u30b1\u30fc\uff08\u30a4\u30f3\u30ca\u30fc\u30ec\u30a4\u30e4\u30fc\u7528\uff09\uff01\u300d\u3002\u3082\u3057\u3001\u3042\u306a\u305f\u304c\u305d\u3046\u5c0b\u306d\u305f\u3089\u300c\u30d3\u30a2\u309210%\u306b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f<\/p>\n\n\n\n

\u6838\u5fc3\u306b\u8feb\u308b\u8cea\u554f\u30c8\u30ec\u30fc\u30b9\u3068\u30d0\u30a4\u30a2\u30b9\u306e\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u8a31\u5bb9\u5dee<\/h2>\n\n\n\n

\u30c8\u30ec\u30fc\u30b9\u3082\u30d3\u30a2\u3082\u30c8\u30e9\u30f3\u30b7\u30fc\u30d0\u30fc\u30fb\u30c1\u30c3\u30d7\u3092\u3064\u306a\u3050\u3002\u3067\u306f\u3001\u306a\u305c\u30c8\u30ec\u30fc\u30b9\u306f10%\u306b\u4fdd\u6301\u3067\u304d\u308b\u306e\u306b\u3001\u30d3\u30a2\u306f\u3067\u304d\u306a\u3044\u306e\u3060\u308d\u3046\u304b\uff1f\u30c8\u30ec\u30fc\u30b9\u3082\u5236\u5fa1\u304c\u5bb9\u6613\u3067\u306a\u3044\u3053\u3068\u306f\u308f\u304b\u3063\u3066\u3044\u308b\u3002\u30c8\u30ec\u30fc\u30b9\u30fb\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u8981\u56e0\u306b\u306f\u3001\u30a8\u30c3\u30c1\u30d5\u30a1\u30af\u30bf\u30fc\u3001\u30ec\u30a4\u30e4\u30fc\u30fb\u30b7\u30d5\u30c8\u3001\u8868\u9762\u7c97\u3055\u306a\u3069\u304c\u3042\u308b\u3002\u30de\u30a4\u30af\u30ed\u30b9\u30c8\u30ea\u30c3\u30d7\u7dda\u8def\u306e\u5834\u5408\u3001\u30bd\u30eb\u30c0\u30fc\u30ec\u30b8\u30b9\u30c8\u3068\u9285\u306e\u539a\u3055\u3082\u91cd\u8981\u3067\u3059\u3002\u305d\u308c\u3067\u3082\u3001\u4e3b\u6d41\u306e\u57fa\u677f\u30b7\u30e7\u30c3\u30d7\u306e\u591a\u304f\u306f\u3001\u30c8\u30ec\u30fc\u30b9\u306e\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u8a31\u5bb9\u8aa4\u5dee\u309210%\u3001\u3042\u308b\u3044\u306f8%\u3068\u4fdd\u8a3c\u3057\u3066\u3044\u308b\u3002\u30d3\u30a2\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u304c\u77e5\u3063\u3066\u3044\u308b\u9650\u308a\u3067\u306f\u300110%\u4ee5\u5185\u306b\u30d3\u30a2\u306e\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3053\u3068\u3092\u7d04\u675f\u3057\u3066\u3044\u308b\u57fa\u677f\u5c4b\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u30d3\u30a2\u306b\u306f\u57fa\u677f\u5c4b\u304c\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3067\u304d\u306a\u3044\u8981\u7d20\u304c\u305f\u304f\u3055\u3093\u3042\u308a\u3001\u4fdd\u8a3c\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u3002.<\/p>\n\n\n\n

\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9<\/h2>\n\n\n\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u307e\u305a2\u3064\u306e\u30d3\u30a2\u30d7\u30ed\u30bb\u30b9\u3001\u30c9\u30ea\u30ea\u30f3\u30b0\u3068\u30d3\u30a2\u30d5\u30a3\u30ea\u30f3\u30b0\u3092\u7d39\u4ecb\u3059\u308b\u3002\u7a74\u3042\u3051\u304c\u91cd\u8981\u3067\u3042\u308b\u3053\u3068\u306f\u591a\u304f\u306e\u4eba\u304c\u77e5\u3063\u3066\u3044\u308b\u304c\u3001\u7a74\u3042\u3051\u306e\u516c\u5dee\u306f\u30d3\u30a2\u306e\u6027\u80fd\u306b\u3069\u306e\u7a0b\u5ea6\u5f71\u97ff\u3059\u308b\u306e\u3060\u308d\u3046\u304b\u3002\u30d5\u30a3\u30ea\u30f3\u30b0\u306b\u3064\u3044\u3066\u306f\u3001\u30d3\u30a2\u306b\u6a39\u8102\u3084\u30bd\u30eb\u30c0\u30fc\u30ec\u30b8\u30b9\u30c8\u3092\u5145\u586b\u3059\u308b\u3053\u3068\u3067\u30d3\u30a2\u306e\u6027\u80fd\u304c\u5909\u308f\u308b\u3068\u8003\u3048\u3066\u3044\u308b\u4eba\u304c\u591a\u3044\u3088\u3046\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u5f71\u97ff\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u691c\u8a3c\u3059\u308b\u3002.<\/p>\n\n\n\n

1.\u6398\u524a\u30d7\u30ed\u30bb\u30b9\u3068\u30d3\u30a2\u6027\u80fd\u3078\u306e\u5f71\u97ff<\/h2>\n\n\n\n

\u307e\u305a\u3001\u7a74\u3042\u3051\u3002\u30c9\u30ea\u30eb\u30b5\u30a4\u30ba\u3068\u4ed5\u4e0a\u3052\u7a74\u30b5\u30a4\u30ba\u306e2\u3064\u306e\u540d\u524d\u3092\u3088\u304f\u8033\u306b\u3057\u307e\u3059\u3002PCB\u30d5\u30a1\u30a4\u30eb\u30678\u30df\u30eb\u306e\u7a74\u3092\u8a2d\u8a08\u3057\u305f\u3068\u3057\u3066\u3001\u5de5\u5834\u304c8\u30df\u30eb\u306e\u30c9\u30ea\u30eb\u30fb\u30d3\u30c3\u30c8\u3092\u4f7f\u3046\u3068\u601d\u3044\u307e\u3059\u304b\uff1f\u3082\u3061\u308d\u3093\u305d\u3093\u306a\u3053\u3068\u306f\u306a\u3044\u3002\u30d3\u30a2\u306f\u7570\u306a\u308b\u5c64\u306e\u30c8\u30ec\u30fc\u30b9\u3092\u63a5\u7d9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u9285\u304c\u7a74\u3092\u5782\u76f4\u306b\u8cab\u901a\u3059\u308b\u3088\u3046\u306b\u3001\u7a74\u306f\u30e1\u30c3\u30ad\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u304c\u30e1\u30c3\u30ad\u30b9\u30eb\u30fc\u9285\u3067\u3059\u3002IPC\u898f\u683c\u306b\u3088\u308b\u3068\u3001\u30e1\u30c3\u30ad\u30b9\u30eb\u30fc\u9285\u306e\u539a\u3055\u306f\u7d0418\u03bcm\u304b\u308920\u03bcm\u3068\u6c7a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5de5\u5834\u306f\u30e1\u30c3\u30ad\u5f8c\u306e\u7a74\u304c8\u30df\u30eb\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u305d\u306e\u6700\u7d42\u7684\u306a\u30b5\u30a4\u30ba\u304c\u5b8c\u6210\u3057\u305f\u7a74\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u5143\u306e\u30c9\u30ea\u30eb\u30b5\u30a4\u30ba\u306f8\u30df\u30eb\u3088\u308a\u5927\u304d\u304f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u3069\u306e\u304f\u3089\u3044\u5927\u304d\u3044\u306e\u3067\u3059\u304b\uff1f10\u30df\u30eb\uff1f12\u30df\u30eb\uff1f\u3053\u306e\u30b5\u30a4\u30ba\u306e\u9055\u3044\u306f\u30d3\u30a2\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3002.<\/p>\n\n\n\n

\u5de5\u5834\u306e\u30c9\u30ea\u30eb\u516c\u5dee\u898f\u5247\u306b\u3088\u308b\u3068\u30010.2 mm (8 mil)\u306e\u4ed5\u4e0a\u3052\u7a74\u306b\u306f\u3001\u5c11\u306a\u304f\u3068\u30820.25 mm (10 mil)\u306e\u30c9\u30ea\u30eb\u30fb\u30d3\u30c3\u30c8\u304c\u4f7f\u7528\u3055\u308c\u308b\u3002\u3088\u308a\u53b3\u5bc6\u306a\u7ba1\u7406\u3092\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u3001\u5de5\u5834\u3067\u306f0.3 mm (12 mil)\u306e\u30c9\u30ea\u30eb\u30fb\u30d3\u30c3\u30c8\u3092\u4f7f\u3046\u304b\u3082\u3057\u308c\u306a\u3044\u3002\u30c9\u30ea\u30eb\u304c\u5927\u304d\u3044\u307b\u3069\u30a4\u30f3\u30d4\u30fc\u30c0 \u30f3\u30b9\u304c\u4f4e\u304f\u306a\u308b\u3053\u3068\u306f\u3001\u8ab0\u3082\u304c\u77e5\u3063\u3066\u3044\u308b\u3002\u3057\u304b\u3057\u3001\u3069\u306e\u7a0b\u5ea6\u4f4e\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u5f53\u793e\u306e\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u7d50\u679c\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n

\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u308b\u3068\u30010.2mm\u304b\u30890.3mm\u306e\u30d3\u30a2\u306f\u30015\u03a9\u4ee5\u4e0a\u306e\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u5dee\u304c\u3042\u308b\u3002.<\/p>\n\n\n\n

\u7d4c\u7531\u306b\u3088\u308b\u640d\u5931\u3092\u898b\u308c\u3070\u3001\u660e\u78ba\u306a\u9055\u3044\u304c\u3042\u308b\u3053\u3068\u3082\u308f\u304b\u308b\u3002.<\/p>\n\n\n\n

\u3053\u306e\u30b7\u30f3\u30b0\u30eb\u30d3\u30a2\u30fb\u30c9\u30ea\u30eb\u52a0\u5de5\u3067\u306f\u3001\u52a0\u5de5\u516c\u5dee\u3060\u3051\u306710%\u4ee5\u4e0a\u306e\u632f\u308c\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002.<\/p>\n\n\n\n

2.\u30d3\u30a2\u30d5\u30a3\u30ea\u30f3\u30b0\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u7d50\u679c<\/h2>\n\n\n\n

\u3055\u3066\u3001\u30d3\u30a2\u5145\u586b\u306b\u3064\u3044\u3066\u3060\u3002\u591a\u304f\u306e\u53cb\u4eba\u304c\u3001\u30d3\u30a2\u5145\u586b\u306f\u30d3\u30a2\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3059\u308b\u306e\u304b\u3068\u5c0b\u306d\u3066\u304d\u305f\u3002\u79c1\u306f\u5f7c\u3089\u306b\u8a00\u3044\u7d9a\u3051\u305f\uff1a\u300c\u5f71\u97ff\u306f\u306a\u3044\uff01\u5f71\u97ff\u306f\u306a\u3044\uff01\u300d\u3068\u8a00\u3044\u7d9a\u3051\u305f\u3002\u5f7c\u3089\u306f\u79c1\u3092\u4fe1\u3058\u305f\u304c\u3001\u305d\u308c\u3067\u3082\u307e\u3060\u7591\u554f\u3092\u6301\u3063\u3066\u3044\u305f\u3002\u305d\u3053\u3067\u3001\u79c1\u306f\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u884c\u3063\u3066\u78ba\u8a8d\u3057\u305f\u3002.<\/p>\n\n\n\n

\u4e0b\u306e\u56f3\u306f\u3001\u672a\u5145\u586b\u30d3\u30a2\u3068\u5145\u586b\u30d3\u30a2\u306e\u30e2\u30c7\u30eb\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u8d64\u306f\u30d3\u30a2\u3092\u5145\u586b\u3059\u308b\u6a39\u8102\u307e\u305f\u306f\u30bd\u30eb\u30c0\u30fc\u30ec\u30b8\u30b9\u30c8\u3092\u610f\u5473\u3057\u307e\u3059\u3002.<\/p>\n\n\n\n

\"Return<\/figure>\n\n\n\n

\u3053\u306e2\u3064\u306e\u30b1\u30fc\u30b9\u306b\u3064\u3044\u3066\u3001\u30ea\u30bf\u30fc\u30f3\u30ed\u30b9\u3068\u633f\u5165\u640d\u5931\u3092\u6bd4\u8f03\u3057\u305f\u3002\u306a\u305c\u7dda\u304c1\u672c\u3057\u304b\u306a\u3044\u306e\u3067\u3059\u304b\uff1f\u7dda\u304c\u91cd\u306a\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002\u306a\u305c\u91cd\u306a\u3063\u3066\u3044\u308b\u306e\u304b\uff1f\u5f71\u97ff\u304c\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u7d50\u679c\u306f\u540c\u3058\u3067\u3059\u3002.<\/p>\n\n\n\n

\u7406\u8ad6\u7684\u7406\u7531\uff1a\u30d5\u30a3\u30ea\u30f3\u30b0\u304c\u554f\u984c\u306b\u306a\u3089\u306a\u3044\u7406\u7531<\/h2>\n\n\n\n

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We went to a PCB shop and asked them: \u201cCan you control trace impedance to within 10%?\u201d They would answer 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