Method of producing a strain-sensitive resistor arrangement
AssigneeMannesmann VDO AG
InventorsArthur Schäfert, Jürgen Irion, Zlatko Penzar, Wolfgang Porth
Life of this patent
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Abstract
The invention relates to a strain-sensitive resistor, comprising a resistance layer arranged on a support element and an electromechanical transducer produced with this resistor. An increase in the electrical measured signal picked off across the resistor is achieved in a simple way by the support element (1) having a recess (7) on its surface (9) which, when the support element (1) is subjected to mechanical stress in at least one area of the surface (9) of the support element (1) in which the resistance layer (4) is positioned, produces a ratio between the two main strain directions (L, T) of the resistance layer (4) which differs in magnitude.
Claims4
A method of producing a strain-sensitive resistor arrangement, comprising the steps of:
- (a) applying a resistive layer to a first side of a first support sheet;
- (b) matching an area of a flexible film layer to a shape of a recess in a surface of a support element;
- (c) covering the first side of the first support sheet and the resistive layer with the flexible film layer, wherein an adhesion of the flexible film layer to the at least one of the insulating layer and the resistive layer is greater than an adhesion of the first support sheet to the at least one of the insulating layer and the resistive layer;
- (d) removing the support sheet from the resistive layer such that the resistive layer remains on the flexible film layer and applying the flexible film layer with the resistive layer to the surface of the support element so that the area of the flexible film layer matching the shape of the recess defined in the surface is congruent with the shape of the recess defined in the surface, and so that the resistive layer is arranged to detect surface strain by detecting two stresses at the surface of the support element proximate the recess when the support element is subjected to torsion;
- and
- (e) subjecting the support element to a heat treatment after said step (d) to burn off the flexible film layer and sinter on the resistive layer.
Dependencies are inferred from the claim text.