Electric heating – Metal heating – By arc
Patent
1996-02-01
1998-04-07
Hoang, Tu B.
Electric heating
Metal heating
By arc
21912164, 21912182, B23K 2602
Patent
active
057367108
ABSTRACT:
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.
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patent: 4358658 (1982-11-01), Blarigan et al.
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patent: 5537883 (1996-07-01), Okauchi et al.
patent: 5611946 (1997-03-01), Leong et al.
Ikeda Tatsuo
Karaki Eiji
Kuwahara Takuo
Hoang Tu B.
Mills Gregory L.
Seiko Epson Corporation
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