Abstract: A piezoelectric oscillator is provided with a container unit in which an upper cavity and a lower cavity are partitioned by a partition wall, a piezoelectric oscillating element accommodated in the upper cavity, an IC chip and electronic components accommodated in the lower cavity and forming an oscillating circuit, and external terminals provided at the periphery of the bottom surface of the container unit and connected with the oscillating circuit. A jitter reducing structure for reducing jitter components of an oscillation wave outputted from the output terminal which is an external terminal electrode is formed in the partition wall of the container unit. There can be provided a small-size piezoelectric oscillator which has an excellent jitter characteristic of an oscillation waveform and can stably and satisfactorily perform high-frequency oscillation utilizing overtone oscillation, and whose characteristic is easily changeable to provide excellent versatility and noise resistance.

Abstract: A piezoelectric oscillator is provided with a container unit in which an upper cavity and a lower cavity are partitioned by a partition wall, a piezoelectric oscillating element accommodated in the upper cavity, an IC chip and electronic components accommodated in the lower cavity and forming an oscillating circuit, and external terminals provided at the periphery of the bottom surface of the container unit and connected with the oscillating circuit. A jitter reducing structure for reducing jitter components of an oscillation wave outputted from the output terminal which is an external terminal electrode is formed in the partition wall of the container unit. There can be provided a small-size piezoelectric oscillator which has an excellent jitter characteristic of an oscillation waveform and can stably and satisfactorily perform high-frequency oscillation utilizing overtone oscillation, and whose characteristic is easily changeable to provide excellent versatility and noise resistance.

Abstract: In a surface-mount type crystal oscillator according to the invention, a part of side surfaces of a lower cavity are formed into bulging space portions bulging into separating areas between adjacent ones of a plurality of terminal electrodes provided around the lower cavity. By accommodating an IC chip and an electronic device in the lower cavity including the bulging space portions, the crystal oscillator can be miniaturized without affecting the size of the plurality of terminal electrodes.

Abstract: A crystal oscillator in which IC control terminal electrodes for writing temperature compensation data in an IC chip are formed on side surfaces of a main body while being distanced from the top and bottom surfaces of the main body. The IC control terminal electrodes will not be short-circuited with a conductive pattern for sealing the crystal oscillating element on the top surface, and the IC chip will not be destroyed by a welding current which flows when a metal cover is mounted on the top surface. The IC control terminal electrodes will not be short-circuited with other wiring conductors during the soldering to bond the crystal oscillator to a printed circuit board. The compensation data or other data written in the IC chip can be stably maintained, thereby securing a stable operation.