Crystal controlled oscillator

A crystal controlled oscillator, comprising:

• a crystal package with an insulating container that houses a crystal resonator;
• and
• an IC chip board that includes an IC chip integrating an oscillator circuit, the oscillator circuit being configured to generate an oscillation signal of a predetermined frequency based on a vibration signal of the crystal resonator, wherein
• the crystal package includes:
• a first container that includes a planar first bottom wall layer made of an insulating material and a first frame wall layer disposed at an end edge of the first bottom wall layer, the first frame wall layer forming a first depressed portion;
• a crystal resonator housed in the first depressed portion along an inner surface of the first bottom wall layer;
• a lid body secured to the first frame wall layer so as to hermetically seal the first depressed portion, the lid body being made of an insulating material only;
• and
• an external terminal at an outer bottom surface of the first bottom wall layer of the first container, the external terminal being configured to output a vibration signal of the crystal resonator, wherein
• the crystal resonator includes a crystal piece, an upper side excitation electrode on an upper surface of the crystal piece, and a lower side excitation electrode on a lower surface of the crystal piece, and
• the IC chip integrates an oscillator circuit disposed at an outer bottom surface of the first bottom wall layer of the crystal package, the oscillator circuit connecting to the lower side excitation electrode of the crystal resonator from the external terminal to an input side with high impedance, the oscillator circuit connecting to the upper side excitation electrode to an output side with low impedance, the upper side excitation electrode being a shielding electrode of the crystal resonator.