Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-02-03
1979-09-11
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310367, 310368, H01L 4118
Patent
active
041676866
ABSTRACT:
An AT-cut piezoelectric crystal resonator having a plurality of contoured surfaces, two of these contoured surfaces being generated by translating contour lines parallel to the z-axis and perpendicular to the electric axis. At least one of these two surfaces is convex, and another two contoured surfaces are perpendicular to the z-axis and spaced apart by a length dimension z'.sub.0 which is 0.1 to 1.3 of the maximum thickness dimension representing the distance between the first mentioned two surfaces and measured along a line perpendicular to the x-axis. The resonator is adapted for performing a mode of vibration along the thickness forming either a fundamental standing wave or an overtone thereof of a thickness-shear vibration. The free ends of the vibration are positioned at the first mentioned two surfaces, and the amplitude of vibratory displacements appearing along the x-axis is maximum at the center of each surface of the first mentioned two surfaces. The last mentioned center is the midpoint of a length taken along the x-axis dimension which is 3 to 15 of the maximum thickness dimension, and constituting the span of arc of the convex surface. The amplitude becomes null at a point on each of the first mentioned two surfaces where that point approaches each end of the convex line generating the convex surface, and the distribution of the amplitude is uniform on any point taken along the length of the above mentioned z-axis dimension on each of the first mentioned two surfaces.
REFERENCES:
patent: 3792294 (1974-02-01), Royer
patent: 4017753 (1977-04-01), Ishiwata et al.
patent: 4071797 (1978-01-01), Zumsteg et al.
patent: 4114062 (1978-09-01), Mattuschka
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