| 摘要 |
A surface mounting quartz crystal oscillator has an IC chip containing an oscillator circuit, and a quartz crystal unit which are sealed in a container body by a metal cover, wherein stray capacitances C1, C2 are equivalently in parallel with oscillation capacitors Ca, Cb connected to one and the other ends of the crystal unit, respectively. A gap between the IC chip and a crystal blank of the crystal unit, and a gap between the crystal blank and metal cover are set in accordance with a changing amount of the oscillation frequency due to a change in the stray capacitances C1, C2 in a direction in which a change in equivalent series capacitance is reduced, as viewed from the crystal unit, while maintaining a spacing between the IC chip and metal cover.
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