Measuring and testing – Vibration – Sensing apparatus
Patent
1984-04-20
1986-01-07
Kreitman, Stephen A.
Measuring and testing
Vibration
Sensing apparatus
73 35, 29 2535, 29509, 29593, 310 25, B21D 3900, H01L 4100
Patent
active
045627401
ABSTRACT:
An improved method and apparatus are provided for making vibration sensors, particularly of the type used in automotive applications wherein a piezoelectric element is affixed to a flexing plate which is mounted on a support stem in "umbrella" fashion. A desired resonant vibrating frequency of the sensor is obtained by progressively working a neck portion of the support stem, as by peening, to effectively decrease the vibrating radius of the plate and thus increase its resonant frequency toward and to a desired resonant frequency. The plate's frequency is monitored and the working of the stem neck portion is terminated when a desired resonant frequency is attained. An inclined support shoulder on the stem below the neck portion facilitates the aforementioned manufacture. An undercut positioned in the stem neck portion near its transition into the support shoulder further facilitates the manufacture.
REFERENCES:
patent: 4114670 (1978-09-01), Akashi et al.
patent: 4131484 (1978-12-01), Caruso et al.
patent: 4371804 (1983-02-01), Peng et al.
patent: 4385473 (1983-05-01), Aoki et al.
patent: 4463596 (1984-08-01), Asakura
Tinder David V.
Webber Hugh C.
Kreitman Stephen A.
Schneeberger Stephen A.
United Technologies Automotive Inc.
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