Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1991-08-23
1993-04-13
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
29 2541, 73718, 361283, G01L 708, G01L 912
Patent
active
052012280
ABSTRACT:
A pressure sensor including at least two ceramic layers formed as elongated sheets and bonded together with a gap therebetween at one end so as to form a diaphragm of a portion of one of the ceramic layers that faces the gap and that receives on an outer surface thereof the pressure to be measured, a pressure-sensitive electrode portion from which an electric output corresponding with the pressure to be measured is generated on the basis of the amount of strain of the diaphragm that develops under the pressure to be measured, the pressure-sensitive electrode portion being provided on or around the diaphragm, and a plurality of conductor paths that are connected to the pressure-sensitive electrode portion and that extend along the length of the ceramic layers, the conductor paths having terminals at the other end of the bonded ceramic layers for connection to an external electric circuit. In another embodiment of the present invention, the pressure sensor includes a cylindrical ceramic layer, and a ceramic layer provided around the circumference of the cylindrical ceramic layer with a circumferential gap formed between the ceramic layer and the cylindrical ceramic layer at one end so as to form a diaphragm of a portion of the ceramic layer that faces the gap.
REFERENCES:
patent: 3750476 (1973-08-01), Brown
patent: 3993939 (1976-11-01), Slavin et al.
patent: 4184189 (1980-01-01), Davis et al.
Kitsukawa Kanehisa
Kojima Takao
Mizumoto Katsuyoshi
Yasuda Toshikatsu
NGK Spark Plug Co. Ltd.
Woodiel Donald O.
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