JPS6421332A - Pressure sensor - Google Patents

Abstract

PURPOSE:To achieve a higher pressure and a higher sensitivity with the stabilization of characteristics against environmental changes, by building up all the sensor component members of metal while a difference in linear heat expansion coefficient between an amorphous magnetic alloy and other sensor components is below a fixed value. CONSTITUTION:When an oil pressure is applied at an oil pressure introduction port 10, a pressure works on an amorphous magnetic alloy disc 2 through a through hole 6. As a stress is generated in the disc 2 to reduce magnetic permeability of the amorphous magnetic alloy, the resulting change is detected with a coil 8 to measure oil pressure with a detection circuit 9. A cylindrical soft magnetic body 1, a container 7 and a lid body 4 arc all made up of metal and a difference in the linear thermal expansion coefficient between the amorphous magnetic alloy of the disc 2 and other sensor components is set below + or -2X10<-6>.