Method and apparatus for sealing piezoelectric resonator via las

Details Method and apparatus for sealing piezoelectric resonator via las Method and apparatus for sealing piezoelectric resonator via las

1997-10-21

1999-12-21

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310344, 310348, H01L 41053

Patent

active

060053291

ABSTRACT:
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.

REFERENCES:
patent: 2454244 (1948-11-01), Wintermute
patent: 3022431 (1962-02-01), McKnight
patent: 3336487 (1967-08-01), Martyn, et al.
patent: 4746905 (1988-05-01), Harima et al.
patent: 4899076 (1990-02-01), Kato
patent: 5166570 (1992-11-01), Takahashi
patent: 5184043 (1993-02-01), Yoshinaga

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