Method for ablating points of contact (debumping)
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United States of America Patent
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Jan 27, 2009
Grant Date -
Nov 4, 2004
app pub date -
Oct 5, 2001
filing date -
Oct 6, 2000
priority date (Note) -
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Abstract
The invention relates to a method for removing a plurality of raised places of contact made of a meltable metal, such as tin or indium or an alloy, such as tin-containing solder, silver-containing solder or lead-containing solder, the meltable metal being meltable above a first temperature limit, the places of contact being surface-distributed over a substrate. It is also possible to form vaulted domes on a plurality of metallic support segments which are located on one of the surfaces of a substrate. The invention aims at reducing production costs, particularly at removing a soldered layer once applied. If defective contact places occur, a plurality of the raised contact places, particularly substantially all contacts, are at least in substantial portions melted off from the substrate by contacting them with a molten metal. Between the substrate and the support segments distributed over the substrate and a surface of the molten metal an organic fluid may be present, the organic fluid being provided as a covering layer only and evaporating off the substrate surface, after the vaulted domes have been formed.
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