Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2007-10-05
2009-08-04
Mis, David (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C310S318000, C310S368000, C310S370000
Reexamination Certificate
active
07570126
ABSTRACT:
A tuning fork type piezoelectric vibrating piece, comprising: a base unit having a base electrode for an external connection; a fork shaped arm unit extending from the base unit; a groove portion at least on a surface or a rear surface of the arm unit; a groove electrode on the groove portion; a side surface electrode on the arm unit without the groove portion; a first electrode connecting the base unit and the side surface electrode or the groove electrode; a second electrode connecting the groove electrode and the side surface electrode; and a side surface electrode set at a predetermined distance from the bottom of the fork part of the base unit. The piezoelectric vibrating piece may be packaged with a base electrode connected to an external output terminal. The piezoelectric oscillator may have an amplifier circuit and a feedback circuit with a resonant element determining the resonant frequency.
REFERENCES:
patent: 4384232 (1983-05-01), Debely
patent: 1999-160074 (1999-06-01), None
patent: 2002-076827 (2002-03-01), None
patent: 2005-229143 (2005-08-01), None
Mis David
Nihon Dempa Kogyo Co. Ltd.
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