| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystal oscillator capable of reducing the increase in the equivalent parallel capacity by reducing the parasitic capacity due to a ceramic container of the crystal oscillator, and realizing miniaturization. SOLUTION: A seal ring 25 of a ground potential is mounted on the periphery of the cavity opening of a ceramic container 2 formed with a cavity part 20 for housing a crystal vibrator 3 on the upper face of dielectric substrates 21 and 22, and a metallic cover body 5 for sealing the cavity 20 is welded to the seal ring 25 of the ground potential. Then, electrode pads 23 for input/output, input and output terminals (external terminal electrodes) 24a formed so as to be faced through the dielectric substrates 21 and 22 to the electrode pads 23 for input/output on the lower face of the dielectric substrates 21 and 22, and a via hole conductor for connecting the electrode pads 23 for input/output to the input and output terminals through the thickness direction of the dielectric substrates, are formed at one edge side of the bottom face of the cavity 20. In this case, the input and output terminals are disposed in the frame of the seal ring when this ceramic container 2 is flatly viewed.
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