Journal of the Semiconductor & Display Technology (반도체디스플레이기술학회지)

The Korean Society Of Semiconductor & Display Technology (한국반도체디스플레이기술학회)
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High Speed Measurement of Ball Height Data for Ball Grid Arrays

BGA(Ball Grid Array) 높이 데이타의 고속 측정

  • Cho Tai-Hoon (School of Information Technology, Korea University of Technology and Education) ;
  • Joo Hyo-Nam (Division of Display Engineering, Hoseo University)
  • 조태훈 (한국기술교육대학교 정보기술공학부) ;
  • 주효남 (호서대학교 디스플레이공학부)
  • Published : 2006.03.01
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Abstract

Recently, Ball Grid Arrays(BGAs) are getting used more frequently for a package type. The connectors on a BGA consist of a large number of small solder balls in a grid shape on its bottom side. However, since balls of BGAs mounted on PCBs are not visible, inspection before mounting them is indispensable. High speed non-contact 3D measurement technologies are necessary far real-time measurement of ball height, the most important inspection item. In this paper, an accurate 3D data acquisition system for BGAs is proposed that can acquire 3D profile at high speed using a 3D smart camera and laser slit ray projection. Some clipping and morphological filtering operations are employed to remove spiky error data, which occur due to reflections from some ball area to camera direction.

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