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公开(公告)号：US20210185800A1
公开(公告)日：2021-06-17
申请号：US16866796
申请日：2020-05-05
Applicant: CHIPBOND TECHNOLOGY CORPORATION
Inventor： Yi-Chen Lien , Yen-Ping Huang , Hui-Yu Huang , Chih-Ming Peng , Chun-Te Lee
Abstract: A circuit board includes a substrate having a through hole, a circuit layer, a first measurement mark and a second measurement mark. According to the first and second measurement marks, an electronic detection device can measure a first distance between a first edge of the through hole and the first measurement mark and a second distance between a second edge of the through hole and the second measurement mark to determine whether the through hole has an undesired size or shift.
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