Seiko Epson Corporation

Takuo Kuwahara

Eiji Karaki

Tatsuo Ikeda

The case of a piezoelectric resonator in which a piezoelectric vibrator having a piezoelectric body and an electrode is flattened and a guard is provided protruding by the amount about the same as the thickness of the case on the hermetic terminal so that the open edge is received by insertion. Then the hermetic terminal in which one end of the piezoelectric vibrator is supported by the inner lead is inserted in the open edge of the case and the case is sealed by laser welding the welding area extending to the guard and to the open edge. By so doing, a thin piezoelectric resonator is provided which is desirable for surface mounting and being capable of maintaining the inside of the case in a stable vacuum state or sealed with nitrogen and the like for a long time. Moreover, by supporting the piezoelectric vibrator by the flattened inner lead inside the air tight case, a piezoelectric resonator is provided which has excellent frequency characteristics and long term aging characteristics.

Method and apparatus for sealing piezoelectric resonator via laser

The case of a piezoelectric resonator in which a piezoelectric oscillator piece having a piezoelectric body and an electrode is flattened and a guard is provided protruding by the amount about the same as the thickness of the case on the hermetic terminal so that the open edge is received by insertion. Then the hermetic terminal in which one end of the piezoelectric oscillator piece is supported by the inner lead is inserted in the open edge of the case and the case is sealed by laser welding the welding area extending to the guard and to the open edge. By so doing, a thin piezoelectric resonator is provided which is ideal for surface mounting and being capable of maintaining the inside of the case in a stable vacuum state or sealed with nitrogen and the like for a long time.

Growing community of inventors

Nagano-ken, Japan

Takuo Kuwahara