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SME MS910258
- Laser Measurements For High Yield Smt Process Control
- standard by Society of Manufacturing Engineers, 06/01/1991
- Publisher: SME
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THIS PAPER SHOWS HOW NEW INSTRUMENTATION IS USED TO PROVIDE REAL-TIME HEIGHT OR MATERIAL VOLUME MEASUREMENTS FOR IMPROVED SMT PROCESS CONTROL. EXAMPLES ARE GIVEN OF 3-D METROLOGY FOR INSPECTING THICK FILM RESISTORS, SOLDER PASTE VOLUME, REFLOWED SOLDER, SOLDER MASK, TAPE AUTOMATED BONDING, LEAD COPLANARITY, AND CERAMIC PACKAGES. A SPECIFIC EXAMPLE OF YIELD IMPROVEMENTS USING 3-D MEASUREMENTS IS GIVEN.