Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2006-10-02
2008-07-01
Mis, David (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S068000, C331S069000, C331S10800D, C331S176000
Reexamination Certificate
active
07394327
ABSTRACT:
A surface mount type temperature-compensated crystal oscillator includes a crystal blank; an IC chip integrating an oscillation circuit using the crystal blank and a temperature compensation mechanism of compensating frequency temperature characteristics of the crystal blank; and a substantially rectangular parallelepiped container body for surface mounting having a first recess of housing the crystal blank and a second recess of housing the IC chip. Respective side surfaces corresponding to the long sides of the container body are provided with crystal inspection terminals for inspecting oscillation characteristics of the crystal blank and respective side surfaces corresponding to the short sides are provided with data writing terminals for writing temperature compensation data to the temperature compensation mechanism. A conductive path electrically connecting the IC chip to the crystal inspection terminal is formed to be shorter than a conductive path electrically connecting the IC chip to the data writing terminal.
REFERENCES:
patent: 6229249 (2001-05-01), Hatanaka et al.
patent: 2006/0055478 (2006-03-01), Isimaru
patent: 2003-204221 (2003-07-01), None
Mizumura Hiroaki
Moriya Kouichi
Fitch Even Tabin & Flannery
Mis David
Nihon Dempa Kogyo Co. Ltd.
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