| 摘要 |
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 DEG to -1 DEG , while the angle theta of the optic (z) axis with respect to either of these plane lies either in the 3 DEG -6 DEG range or in the 68 DEG -72 DEG range. Since in the regions of theta =4 DEG and theta =70 DEG 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.
|
