Transcription of 8-1-2-3 スルーホールフォイル ... - jpca.net
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8-1-2-3 スルーホールフォイル ... - jpca.net
SR Characteristics There is a cylindrical crack on the inner layer copper foil inside of the intersection of the hole wall and the inner layer. Causes/processes involved/keys to judgment Repeated thermal stress creates an internal stress concentration to the inner layer copper foil near the intersection of the hole wall and the inner layer conductor results in a fatigue fracture. (Thermal shock test) Characteristics A circumferential (doughnut-like) crack is seen in the through hole.
sr 欠陥 シンボルマーク欠陥 めっき欠陥 スルーホール欠陥 機械加工欠陥 その他欠陥 信頼性不足 はんだ上がり欠陥
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