METHOD TO ASSEMBLE SOLID-STATE DEVICES Russian patent published in 2010 - IPC H01L21/58 

FIELD: electrical engineering.

SUBSTANCE: proposed method comprises soldering crystals to casings with the help of a tool consisting of two electrodes isolated by insulator. The latter incorporates a tube for connection with vacuum system and a sleeve for connection to compressor for protective gas to be fed into soldering zone. Radial holes for gas to flow out from soldering zone are arranged in said tool at height H from electrode working surface. Note here that total cross section of aforesaid holes is a bit smaller than cross section of the sleeve internal bore to ensure protective gas surplus pressure in crystal soldering area. Note also that crystal being attached is clamped by said tool, like vacuum cup does, and arranged above solder located on the casing contact area. Then vacuum system is cut off. Crystal forced by gravity gets down onto the casing contact area solder. Protective gas flow fed via the sleeve acts onto crystal. Crystals are soldered by the pulse of current fed in between the electrodes.

EFFECT: lower costs, higher reliability.

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