Temperature sensitive quartz oscillator crystal with temperature coefficient controlled in manufacture
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United States of America Patent
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May 8, 1990
Issued Date -
N/A
app pub date -
Feb 16, 1989
filing date -
Feb 4, 1987
priority date (Note) -
Expired
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Abstract
The principal surfaces of an oscillator quartz crystal body for a temperature sensor oscillator are plane, parallel and of substantially the same size and are oriented with respect to the usual x-y-z coordinate system of electric, mechanical and optic axes so that the angle .phi. of the electric (x) axis with respect to either of these planes lies within a tolerance range extending from +1.degree. to -1.degree., while the angle .theta. of the optic (z) axis with respect to either of these plane lies either in the 3.degree.-6.degree. range or in the 68.degree.-72.degree. range. Since in the regions of .theta.=4.degree. and .theta.=70.degree. the change of the temperature coefficient with variation of the angle .theta. is relatively slight, because of the respective presence of a maximum and a minimum of the temperature coefficient in these ranges, quartz oscillator crystals of the orientation above-defined can be mass-produced within industrially convenient mechanical tolerance ranges with practically identical temperature coefficients.
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