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Fabrication Technique for Super Accurate Stencils for Fine Pitch

IP.com Disclosure Number: IPCOM000103192D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Anderson, AH: AUTHOR [+2]

Abstract

Disclosed is a method for fabricating metal stencils with greatly improved dimensional accuracy. The advent of fine pitch components in surface mount technology requires very accurate stencils for printing solder paste. Stencils made by the current method of chemical etching do not have sufficient accuracy for high process yields. Industrial computer controlled lasers can be adjusted to cut the metal foils used for stencils. The most important attribute of the computer controlled laser system is its accuracy. The accuracy results from the combination of a small and precisely focused high power laser beam and a precision stepping stage to support and move the work. Once the proper operating parameters are defined, a good laser system can cut openings of .010 inch wide +/- .0005 inch.

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Fabrication Technique for Super Accurate Stencils for Fine Pitch

      Disclosed is a method for fabricating metal stencils with
greatly improved dimensional accuracy.  The advent of fine pitch
components in surface mount technology requires very accurate
stencils for printing solder paste. Stencils made by the current
method of chemical etching do not have sufficient accuracy for high
process yields.  Industrial computer controlled lasers can be
adjusted to cut the metal foils used for stencils.  The most
important attribute of the computer controlled laser system is its
accuracy.  The accuracy results from the combination of a small and
precisely focused high power laser beam and a precision stepping
stage to support and move the work.  Once the proper operating
parameters are defined, a good laser system can cut openings of .010
inch wide  .0005 inch.  The location of component sites can be
held to  .001 inch over a distance of 16 inches.

      Disclosed anonymously.