Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-04-29
1988-02-23
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310321, 73 35, H01L 4108
Patent
active
047272791
ABSTRACT:
A knock sensor includes a circular mounting surface with a flat, self-resonant vibration element and piezoelectric disk coaxially mounted thereon. The vibration element comprises a central circular portion and a pair of outer semicircular portions of larger radius, the outer semicircular portions being shifted in opposite direction along their common border from the axis by an equal distances and each being divided into an equal number of sectors by radial slots centered on the axis and extending outward from the first radius with equal angles therebetween to from diametrically opposed pairs of similarly shaped and sized vibrating sectors. The pairs of sectors have resonant frequencies together forming a sensor passband wider than the individual passbands of the pairs taken separately. In addition, differences in resonant frequency between members of a pair due to misalignment of the axes of the vibration element and mounting surface do not significantly affect the sensor passband.
REFERENCES:
patent: 4254354 (1981-03-01), Keem
patent: 4371804 (1983-02-01), Peng et al.
patent: 4373378 (1983-02-01), Fujishiro et al.
patent: 4630465 (1986-12-01), Hatton
patent: 4655081 (1987-04-01), Burdess
Budd Mark O.
General Motors Corporation
Sigler Robert M.
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