PIEZOELECTRIC OSCILLATOR

PROBLEM TO BE SOLVED: To effectively prevent a joining defect of a surface-mounted type piezoelectric oscillator in two-storied structure constituted by integrally joining a mount substrate where an IC component is mounted with a ceramic container bottom part of a piezoelectric vibrator with lead-free solder by suppressing the amount of gold by which gold-plating layers of respective join electrode surface layers on ceramic-container and mount-substrate sides are diffused into the solder below a fixed ratio against the amount of lead-free solder in use. SOLUTION: The piezoelectric oscillator is equipped with a piezoelectric vibrator 10 having a piezoelectric vibrating element 14 airtightly sealed in the ceramic container 12 and the mount substrate 1 where the IC component 3 is mounted, and a join electrode 11 of the piezoelectric vibrator and a join electrode 4 of the mount substrate are joined together in one body with lead-free solder 20 and also have gold-plating layers as their surface layers, the weight ratio of the lead-free solder and gold that the lead-free solder contains is ≤7.5 wt% . COPYRIGHT: (C)2005,JPO&NCIPI