Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1990-05-22
1992-02-18
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
73431, 73654, 310329, G01P 1509
Patent
active
050883267
ABSTRACT:
An accelerometer for automobiles is disclosed which is mounted on an electrically insulating plate (i.e., a printed circuit board) accommodated within an electrically conductive casing. The electrical connections from the electrodes of the piezoelectric element to the inputs of the charge amplifier are effected by a wiring pattern formed on the insulating plate. The casing consists of an open box-shaped base and a plate-shaped cover, a packing member being interposed therebetween, wherein an electrical connection between the base and the cover is provided by the fixing screws for fixing the cover to the base. The cover has a central recess in which through-type capacitors for producing hermetically sealed electrical connections through a wall of the casing are accommodated. Further, the charge amplifier comprises a temperature compensating capacitor having a positive temperature coefficient of capacitance which is coupled across the electrodes of the piezoelectric element; thus, the variation of the output voltage due to the change in the ambient temperature is compensated for by the capacitor and hence is reduced.
REFERENCES:
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patent: 3701903 (1972-10-01), Merhar
patent: 4178525 (1979-12-01), Barr
patent: 4463596 (1984-08-01), Asakura
patent: 4700973 (1987-10-01), Gademann et al.
patent: 4816713 (1989-03-01), Change, Jr.
Wada Shunichi
Yano Masayuki
Chapman John E.
Mitsubishi Denki K.K.
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