| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive piezoelectric oscillator having an electromagnetic shield function in which deterioration of characteristics is suppressed and short circuit failure is prevented in the package. SOLUTION: A crystal diaphragm 1 is mounted on holding electrodes 21, 22 and 23 provided on a base, and bonded conductively. A cap 3 is then bonded through low melting point glass G. Characteristics of the crystal diaphragm are then evaluated under hermetically sealed state and data corresponding to the characteristics is written in an IC chip, thus obtaining a crystal oscillator having required characteristics. Subsequently, a conductive film C is formed on the cap 3 and an earth connection electrode formed on the base by vacuum deposition, and the conductive film on the surface of the cap 3 is eventually connected with the earth electrode.
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