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Automated inspection of via holes filled with molybdenum paste can be accomplished with a scanning light spot and properly oriented photomultipliers (PMTs).
English (United States)
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Detection of Underfilled Holes in a Ceramic Sheet
Automated inspection of via holes filled with molybdenum paste can be
accomplished with a scanning light spot and properly oriented photomultipliers
In one possible configuration, as shown in Figs. 1 and 2, the spot size is
smaller than the hole and two PMT light collectors are used. PMT 1 is positioned
generally perpendicular to the sheet, while PMT 2 is positioned at an angle to the
sheet surface. As the spot of light (e.g., a laser) moves along each row of holes,
the two PMTs receive signals of the same polarity if the paste fills the hole up to
the sheet surface and different polarity if the hole is underfilled with paste.
PMT 1, located perpendicular to the ceramic sheet, sees all holes equally
black since the hole does not reflect any light in its direction. Thus, PMT 1 serves
as the "presence-of-hole" detector. As shown in Fig. PMT 2, at an angle to the
ceramic sheet, does not collect any light from holes filled with molybdenum up to
the sheet surface, but does receive light when it encounters an underfilled via
hole. The light is reflected from the radius on the edge of the hole, and from the
adjacent clean ceramic of the hole's wall. The shape of the signal obtained is
unique and forms the basis for indicating a defect.
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