缶の貫通穴検出には缶専用の検査ユニットC11740を用意しています。 形状や製造ラインが特異な成形品を検査する場合は、専用の検査ユニットが必要となることが多いです。原理は上記の一般的な検出原理と同様、透過光を検出 する方式となります。 検査構成は右のイラストの様に、検出ユニットに接続された缶が光源ユニットの内側を回転する形になります。この構成により、缶に貫通穴があった場合、光源ユニットからの漏れ光が貫通穴を通って検出ユニットに届くため、欠陥検出が可能となります。
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