• Title/Summary/Keyword: 피듀셜

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A Calibration Method Using Four Fiducials Applicable to Nonlinear Displacement of PCBs on SMT Devices (표면실장장비에서 PCB 비선형 변형 대응을 위한 4점 피튜셜 보정 방법)

  • Jang, Chan-Soo;Kim, Yung-Joon;Kim, Jae-Ok
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.9
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    • pp.151-156
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    • 2002
  • A new position correction method using four fiducials as reference points was developed and examined. It was aimed to calibrate nonlinear deformation by numerous error sources. A correlation for correction was derived from the geometric relationship between four fiducials and chip position. Compared with three points method, it exhibited more accurate correction, especially for inner area of a quadrilateral composed of four fiducial points. Its accuracy was found to be increased as fiducials moves outwardly within a printed circuit board (PCB) and/or as they form more rectangle-like shape As for arbitrarily nonlinear deformation, this method can be applied using more than five fiducials. In this case, local-area calibration is carried out by sectioning a board area into several rectangular are as.