Capacitor construction for use in pressure transducers

Details Capacitor construction for use in pressure transducers Capacitor construction for use in pressure transducers

1988-05-04

1989-05-16

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

73724, H01G 700

Patent

active

048314927

ABSTRACT:
This publication discloses a capacitor construction for use in pressure transducers, including a substrate plate having of a silicon wafer and a thinner glass wafer. A first fixed capacitor plate is provided for overlying the substrate plate plate. A silicon plate is adapted to encircle the substrate plate with its thinned center area acting as a moving capacitor plate by virtue of its diaphragm behavior and a top plate overlying the silicon plate includes a silicon wafer and a glass wafer bonded to the silicon wafer and having a thickness essentially smaller than that of the silicon wafer. According to the invention, over the supporting substrate plate and between the first capacitor plate and its encircling silicon plate, is provided another overlying capacitor overlying plate, which essentially encloses the first capacitor plate. With this design, a reduced temperature sensitivity is accomplished in the capacitor construction.

REFERENCES:
patent: 3397278 (1968-08-01), Pomerantz
patent: 4257274 (1981-03-01), Shimada et al.
patent: 4542435 (1985-09-01), Freud et al.
patent: 4589054 (1986-05-01), Kuisma
patent: 4597027 (1986-06-01), Lehto
patent: 4599906 (1986-07-01), Freud et al.
patent: 4609966 (1986-09-01), Kuisma
patent: 4628403 (1986-12-01), Kuisma
patent: 4730496 (1988-03-01), Knecht et al.

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