Piezoelectric oscillator

1. A piezoelectric oscillator, comprising:

a package including:

a first recessed portion formed on a first surface;

a second recessed portion formed on a second surface with at least a part of a side surface being open, and

a conductor wired from at least one of an inside surface of the first recessed portion and an inside surface of the second recessed portion to an outside surface;

a piezoelectric element accommodated in the first recessed portion;

a lid being in contact with the first surface and air-tightly sealing the first recessed portion;

a circuit element accommodated in the second recessed portion and connected with the conductor;

a resin portion formed in the second recessed portion to cover the circuit element; and

an electrical check terminal connected with the conductor of the package,

wherein the electrical check terminal is formed on a surface of the resin portion with a conductive paste or conductive ink.

2. The piezoelectric oscillator according to claim 1 , wherein the electrical check terminal is formed on a side surface of the resin portion in the second recessed portion.

3. The piezoelectric oscillator according to claim 1 , wherein the electrical check terminal is formed on a bottom surface of the resin portion in the second recessed portion.

4. The piezoelectric oscillator according to claim 1 , wherein the electrical check terminal is connected with the piezoelectric element and used for measuring a characteristic of the piezoelectric element.

5. The piezoelectric oscillator according to claim 1 , wherein the electrical check terminal is connected with the circuit element and used for measuring a characteristic of the circuit element.

6. The piezo electric oscillator according to claim 1 , wherein the electrical check terminal is connected with the circuit element and used for writing data for circuit adjustment to the circuit element.