关键词: 高密度陶瓷外壳, 焊盘, 位置度公差

Abstract: The packaging quality and reliability are directly affected by pad positiondeviation of high density ceramic package. The relative standards and marking methods of positional tolerance at home and abroad are compared and analyzed, and the current reasonable method of position tolerance marking is given.Based on the analysis of the existing position measurement methods, combined with the theory and data analysis,this paper proposes a method of padmeasuring the position degree of high-density shell pads by extracting characteristic parts, which can obtain the position degree of high-density shell pads efficiently and accurately.The samples that passed the test by this measurement method are encapsulated and verified, which prove the rationality of the labeling and measurement method.

Key words: high density ceramic shell, pad, position tolerance