Patent ID: 7514852

Claim:
A piezooscillator device, comprising: a substrate; a cover defining a concavity; a thermostatic oven formed by said cover being connected to said substrate to define an interior space in the concavity which is isolated from atmosphere outside said cover and said substrate, said substrate having a first substrate surface exposed to said interior space and a second substrate surface external to said interior space; a package containing a piezoelectric vibrator, said package having a package electrode connected to an exciting electrode on the piezoelectric element; a recessed portion formed in the first substrate surface of said substrate and communicating with said interior space; a supporting member supporting said package such that said package is in a state partially or entirely accommodated in said recessed portion and separated from said substrate; a heating element provided on a surface of said package; a temperature sensitive element provided in the interior space; and a temperature control unit provided in the interior space and controlling power supply to said heating element based on an output of said temperature sensitive element; and an external electrode disposed on said second substrate surface and providing external connection to said piezoelectric vibrator.