| 摘要 |
A surface-mount quartz crystal oscillator has a quartz crystal unit, a mounting substrate joined to a reverse surface of the crystal unit, an IC (Integrated Circuit) chip accommodated in the mounting substrate and electrically connected to the crystal unit in providing an oscillating circuit, and a chip device such as a bypass capacitor mounted on the mounting substrate. The mounting substrate has a bottom wall, a frame wall mounted on the bottom wall, and a recess defined in at least one principal surface thereof and surrounded by the frame wall, with the IC chip being disposed in the recess. The frame wall has at least one opening defined therein, and the bottom wall has a smaller thickness at a position aligned with the opening than other positions on the bottom wall. The chip device is disposed in the position on the bottom wall.
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