H - Electricity – 01 – L
Patent
H - Electricity
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H01L 21/00 (2006.01) H01L 21/66 (2006.01) H05K 1/02 (2006.01) H05K 1/03 (2006.01) H05K 3/46 (2006.01)
Patent
CA 1187201
INSPECTION OF MULTILAYER CERAMIC CIRCUIT MODULES BY ELECTRICAL INSPECTION OF UNFIRED GREEN SHEETS ABSTRACT A method of manufacturing packages for LSI chips starts with the usual steps of punching holes in green sheets, screening patterning paste (adapted to form cermet conductors or the like after firing) onto the green sheets, and inspecting the green sheets optically. Here, subsets of green sheets are then stacked and compressed into sub- laminates. The sublaminates are then functionally inspected electrically. Inspection is done by means of electromechanical contact, scanning electron microscope like techniques, or by other means of irradiating the conductors to energize them for electrical measurement. Measurement may be made between pairs of terminals on only one side of the device being tested, or on both sides of the device. Beams can be applied both top and bottom from a single source or plural sources. Measuring instruments employ various electro- mechanical techniques as well as electrons, light used photoelectrically, ions, or pneumatic ion jets. Secondary electrons can measure the specimen's potential locally or change its charge. This method can also be employed for the purpose of inspecting other multilayer structures (such as large multilayer printed circuits formed on a plastic base) prior to final assembly of the conductors and the various substrates into a laminated support for electrical circuits. This testing process can also be applied after firing of patterned green sheets prior to plating, as well as after plating.
400594
International Business Machines Corporation
Kerr Alexander
LandOfFree
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