US 2025/0189555 A1Published application

Method of manufacturing a piezoelectric acceleration sensor and piezoelectric acceleration sensor obtained by this method

AssigneeKistler Holding AG

InventorsKim PFLUGER, Andrew Paul COOK, Dan WOLF

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Abstract

A method of manufacturing a piezoelectric acceleration sensor that includes a housing element containing a plurality of measuring elements, a flexible printed circuit board element and a connector element. Each measuring element measures an acceleration along a respective sensitive axis and generates electric charges proportionate for the measured acceleration. The flexible printed circuit board element hosts a plurality of IEPE, which amplify and convert electric charge from the measuring elements into an output voltage. The flexible printed circuit board element is introduced into the housing element and mechanically fixed to a body element inside the housing. The measuring elements are fixed to the body element. The measuring elements are electrically connected to the flexible printed circuit board element. The connector element is electrically connected with a connector section of the flexible printed circuit board and mounted on the housing element.

Claims19

Dependent claims

A method of manufacturing a piezoelectric acceleration sensor that includes a housing element, a body element, a plurality of measuring elements, a connector element, and a flexible printed circuit board element that defines a plurality of circuit board sections, wherein the housing element defines an inner space in which the body element is disposed, wherein each of the plurality of measuring elements is configured to generate a respective measured acceleration along a respective one of a plurality of sensitive axes that are orthogonally related to each other, wherein each of the plurality of measuring elements is configured to create a respective one of a plurality of electric charges for the respective measured acceleration, wherein the flexible printed circuit board element hosts a plurality of IEPE, wherein each of the plurality of IEPE amplifies and converts electric charge from a related one of the plurality of measuring elements into a respective output voltage, wherein the flexible printed circuit board element establishes a ground output voltage;

the method comprising:
configuring the flexible printed circuit board element into pre-shaped printed circuit board wherein each of the plurality of circuit board sections is disposed to lie generally in a respective plane that is orthogonal to a respective plane in which lies each other of the plurality of circuit board sections;
introducing the pre-shaped printed circuit board into the inner space of the housing element;
mechanically fixing the pre-shaped printed circuit board to the body element;
introducing the plurality of measuring elements into the inner space of the housing element and mechanically fixing each of the plurality of measuring elements to the body element;
electrically connecting each of the plurality of measuring elements with a respective one of the plurality of circuit board sections of the pre-shaped printed circuit board element via a respective one of a plurality of first electrical connections, wherein the number of first electrical connections is equal to the number of the plurality of sensitive axes;
electrically connecting the connector element with a connector section of the flexible printed circuit board via a respective one of a plurality of further electrical connections, wherein the number of further electrical connections is equal to the number of the plurality of output voltages;
and
mounting the electrically connected connector element on the housing element.

6 more elements

A piezoelectric acceleration sensor comprising:

a housing element defining an inner space;
a body element disposed within the inner space of the housing element and defining at least a first sensitive axis and a second sensitive axis, which extends in a direction that is normal to the first sensitive axis;
at least a first measuring element mechanically held by the body element and configured and disposed to generate a first electric charge proportional to a first acceleration acting along the first sensitive axis;
at least a second measuring element mechanically held by the body element and configured and disposed to generate a second electric charge proportional to a second acceleration acting along the second sensitive axis;
a flexible printed circuit board element mechanically fixed to the body element and configured and disposed to establish a ground output voltage;
wherein the flexible printed circuit board element defines a first circuit board section and a second circuit board section, wherein the first circuit board section is disposed to lie generally in a first plane, wherein the second circuit board section is disposed to lie generally in a second plane that is disposed orthogonally to the first plane so as to configure the flexible printed circuit board element into pre-shaped printed circuit board;
wherein the first circuit board section carries a first IEPE and a first electrical connection to the first measuring element, wherein the first IEPE is configured to amplify the first electric charge from the first measuring element and convert the amplified first electric charge into a first output voltage;
wherein the second circuit board section carries a second IEPE and a second electrical connection to the second measuring element, wherein the second IEPE is configured to amplify the second electric charge from the second measuring element and convert the amplified second electric charge into a second output voltage;
and
a connector element;
wherein the flexible printed circuit board element includes a connector section and the connector element has a further electrical connection with the connector section.

8 more elements

Dependencies are inferred from the claim text.