Lame mode quartz crystal resonator
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United States of America Patent
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Apr 8, 2003
Grant Date -
May 23, 2002
app pub date -
Apr 18, 2001
filing date -
Nov 17, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The Lame mode quartz crystal resonator vibrating in overtone mode is formed of an X-plate quartz crystal obtained in a manner that a blank X-plate quartz crystal having a coordinate of x, y and z axes is rotated through 36.5.degree. to 47.degree. about its y-axis and further rotated through 65.degree. to 85.degree. about a new x'-axis corresponding to the x-axis produced by the rotation about the y-axis and the thus rotated blank X-plate quartz crystal is then cut out along planes parallel to x-y, y-z and z-x planes of the original coordinate system, respectively. The quartz crystal resonator includes a vibrating portion, a supporting frame and a mounting portion formed integrally. The vibrating portion is connected through two connecting portions to the supporting frame and the mounting portion, as a result of which the quartz crystal resonator has less series resistance R.sub.1 and exhibits minimum vibrational energy losses and minimum frequency change over a wide temperature range.
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