Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-06-13
2006-06-13
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S366000, C310S363000, C310S365000
Reexamination Certificate
active
07061164
ABSTRACT:
The present invention relates to a crystal oscillator that is provided with a crystal element; a main surface electrode configured of a first underlayer formed on each of two main surfaces of the crystal element and a first surface layer of Au superimposed over the first underlayer; an end surface electrode having a second underlayer formed on the crystal element to extend over the main surface electrode and a second surface layer of Au superimposed to cover the second underlayer; a supporter for holding the crystal element in the horizontal direction, bonded to the end surface electrode by a eutectic alloy comprising at least Au; and a base on which the supporter stands. An intermediate layer is provided between the second underlayer and the second surface layer of the end surface electrode; the intermediate layer protrudes further towards the center over the main surface electrode than the second surface layer; and also the intermediate layer is formed of a metal having the characteristic of increasing the adhesive strength between the underlayer and the second surface layer as well as that of the eutectic alloy. The present invention provides a crystal oscillator in which bonding is done with a eutectic alloy that has a higher bond strength, thus preventing peeling of the electrodes.
REFERENCES:
patent: 2003-332876 (2003-11-01), None
patent: 2004200835 (2004-07-01), None
Iwasaki Takahiko
Koki Genwa
Nakahara Masaaki
Obara Shigeru
Aguirrechea J.
Edwards Angell Palmer & & Dodge LLP
Nihon Dempa Kogyo Co. Ltd.
Tamai Karl
Wofsy Scott D.
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