Piezoelectric oscillator and case having an integral electrical terminal
A method of fabricating a case accommodating a piezoelectric vibrating piece therein in a piezoelectric oscillator including the piezoelectric vibrating piece, including the steps of: applying deep drawing to a conductive plate member to shape the plate member in a nearly cylindrical shape with a bottom; pressing an inner surface of a bottom part of the plate member by a punch for step drawing while an outer surface of the bottom part is being abutted against a surface including an opening of a hole of a die having an inner diameter smaller than the outer diameter of the bottom part, whereby a projecting portion is formed on the outer surface of the bottom part; and cutting the plate member having the projecting portion at a predetermined position on the opening side thereof, whereby a case in a nearly cylindrical shape with a bottom having the projecting portion is obtained.
1. A piezoelectric oscillator comprising:
a piezoelectric vibrating piece,
a case having a cavity accommodating the piezoelectric vibrating piece therein;
a hermetic terminal having an annular ring, a lead arranged to penetrate through the ring in which one end side thereof comprises an inner lead portion electrically connected to the piezoelectric vibrating piece and the other end side thereof comprises an outer lead portion providing a first external electrical connection and a filler fixing the lead to the ring, wherein the hermetic terminal seals the piezoelectric vibrating piece inside the case; and
a projecting portion integral with the case and electrically coupled to the piezoelectric vibrating piece, the projecting portion providing a second external electrical connection.
2. An oscillator comprising:
the piezoelectric oscillator according to claim 1 connected to an integrated circuit as an oscillating element.
3. An electronic appliance comprising:
the piezoelectric oscillator according to claim 1 .
4. A radio clock comprising:
the piezoelectric oscillator according to claim 1 electrically connected to a filter part.
5. The piezoelectric oscillator of claim 1 further comprising;
a first electrode on the piezoelectric vibrating piece; and
a second electrode on the piezoelectric vibrating piece,
wherein the lead is electrically coupled to the first electrode and the projecting portion is electrically coupled to the second electrode.