| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing method for a piezoelectric device which suppresses the generation of a crack in a container body. SOLUTION: When a metal cover 3 is bonded to the opening end of a recessed container body 1 formed of laminated ceramic by seam welding, an outer circumference surrounding the metal cover 3 is provided with an annular metal 11 formed of an eutectic alloy whose point transition temperature is lower than a temperature of 573°C of a crystal, for example, an AnSn eutectic alloy. After temporarily fixing at least one set of diagonal parts of the metal cover 3 to the container body 1, a pair of electrode rollers 10(ab) are made to be abut on a pair of opposite sides to advance and is subjected to seal welding while being energized, and the other pair of sides are subsequently subjected to seal welding in a similar manner. Since the seam welding uses the eutectic alloy AuSn whose melting point temperature is about 270°C, the seal welding is performed at a relatively low temperature. Then, even though there is a difference of an expansion coefficients from the container body 1 (ceramic), the generation of a crack or the like can be inhibited by reducing the generation of stress caused by expansion/contraction. COPYRIGHT: (C)2008,JPO&INPIT
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