Patent ID: 6026690
Filing Date: 2000-02-22
Classification: G01C,G01H,G01L,G01N,G01P

Abstract:
A vibration sensor comprising:a substrate;a disk-shaped diaphragm from which are integrally formed a diaphragm portion, a supporting portion and a plurality of flexible displacement portions, wherein said displacement portions extend radially at equal intervals around a circumference of said diaphragm portion between said diaphragm portion and said supporting portion such that said diaphragm portion is able to move relative to said substrate, said diaphragm being spaced from said substrate by a predetermined interval to form a capacitor; andholding means for holding said substrate and holding said supporting portion of said diaphragm spaced at said predetermined interval, wherein a vibration creates a change of electrostatic capacitance between said diaphragm and said substrate;wherein said holding means is a housing for accommodating therein said substrate and said diaphragm and holding said substrate and said supporting portion of said diaphragm; andwherein said holding means comprises a diaphragm ring, a spacer element and a cylindrical frame.