Patent ID: 7525238

Claim:
Ground insulated piezoelectric sensor for the measurement of an acceleration or pressure input, comprising: an element package ( 2 ) with piezoelectric elements, having an upper area ( 6 ) and a lower area ( 7 ); a preload sleeve ( 3 ) surrounding said upper area ( 6 ) of said element package ( 2 ); an insulation sleeve ( 1 ) between the upper area ( 6 ) of said element package ( 2 ) and said preload sleeve ( 3 ); an outer housing ( 4 ) at least partially surrounding said preload sleeve ( 3 ) and the lower area ( 7 ) of said element package ( 2 ) and an insulation part ( 5 ) between said lower area ( 7 ) of the element package ( 2 ) and said outer housing ( 4 ); wherein said upper area ( 6 ) of said element package ( 2 ), said insulation sleeve ( 1 ) and said preload sleeve ( 3 ) have conical shapes and have conforming surfaces.