Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1989-02-16
1990-05-08
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310369, 73855, 374117, H01L 4108
Patent
active
049241320
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.
REFERENCES:
patent: 2176653 (1939-10-01), Bokovoy
patent: 2227904 (1941-01-01), Hight
patent: 2284753 (1942-06-01), Mason
patent: 2486916 (1949-11-01), Bottom
patent: 2676275 (1954-04-01), Bigler
patent: 4114062 (1978-09-01), Mattuschka
patent: 4454443 (1984-06-01), Lukaszek et al.
patent: 4472656 (1984-09-01), Franx
Handbook of Piezoelectric Crystals for Radio Equipment Designers, by J. Buchanan, WADC Technical Report 54-248, Dec. 1954, pp. 12, 20 and 21.
Proceedings of the IRE, Aug. 1962, pp. 1812-1923.
DIN 45 102, Oct. 1964, pp. 1-10.
A.E.U. vol. 18, 1964, Issue 10, pp. 624-629.
A.E.U. vol. 18, 1964, Issue 10, pp. 616-625.
Budd Mark O.
W. C. Heraeus GmbH
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