H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/89
H03H 9/15 (2006.01) H03H 9/19 (2006.01)
Patent
CA 1141445
ABSTRACT OF THE DISCLOSURE The resonator according to the invention comprises at least one quartz crystal in the form of a rectangular thin plate, of which the length 1 is directed along an axis X', the width w along an axis Y' and the thickness t along an axis Z', and which vibrates in a contour mode. The axis Z' is situated in the plane of the electrical axis X and optical axis Z of the crystal and forms with the axis Z an angle ? such that 16° < ? < 36° and the axis Y' forms with the mechanical axis Y of the crystal an angle 6 such that 10° < .theta. < 30° This resonator presents a zero temperature coefficient of the first order and is not dependent to any critical extent on the dimensional ratio between the sides w and 1 of the plate ; The temperature coefficients of higher order are very small. The piezo-electric coupling is such that the optimised mode of oscillation is the only one excited in practice.
335187
Bourgeois Claude
Hermann Jean
Centre Electronique Horloger S.a.
Kirby Eades Gale Baker
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