Machining Piezoelectric Transducer Electrodes for Impact Location
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Solution Overview
Problem
Existing methods for manufacturing devices to locate impacts on interactive surfaces using piezoelectric transducers face challenges in achieving precise positioning, leading to errors in impact location due to uncertainties in transducer placement and adhesive retraction, especially in applications requiring high precision like leisure or sportive firing.
Innovation Solution
A method involving the precise machining of the upper conductive layer of transducers to center them around central positioning points, reducing uncertainty to less than 10 μm, allowing for accurate attachment and improved precision in impact location without requiring precise dimensions or conventional attaching techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If transducers are attached using conventional attaching techniques, then the manufacturing process is simple, but the positioning precision is insufficient leading to errors greater than 10 μm
Solution Approach 1:
The patent applies preliminary action by defining central positioning points on the interactive surface before transducer attachment. These predefined reference points guide the subsequent machining and attachment processes, ensuring that transducers are positioned accurately relative to the surface geometry before any actual attachment occurs.
Solution Approach 2:
The patent replaces conventional mechanical attaching techniques with a machining-based approach. Instead of relying on adhesive bonding or mechanical mounting that limits precision, the invention uses machine tools to directly machine the transducers or their mounting structures, achieving positioning precision better than 10 μm through controlled material removal and precise tool positioning.
2Measurement precision
If transducer dimensions and placement are precisely controlled, then impact location accuracy improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the manufacturing parameter from controlling transducer placement position to controlling transducer geometry through machining. By machining the transducers to precise dimensions and shapes after attachment, the system achieves accurate impact location measurement while simplifying the attachment process, as the machining step corrects any initial placement variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures precise positioning of transducers, reducing errors and achieving the necessary precision for high-demand applications like leisure or sportive firing, where accurate impact location is critical.
Implementation Method 1
at least three transducers... designed to capture the progressive mechanical waves propagating in the interactive surface from the impact and transform them into electrical signals... a piezoelectric intermediate layer
Data Source
AI summary
This method for manufacturing a device for locating an impact comprising an interactive surface having a front face for receiving an impact and at least three transducers that need to be distributed and attached against the front face or a rear face of the interactive surface, comprises the following steps: determining a central positioning point for each transducer on the front face or rear face of the interactive surface; attaching each transducer, via the lower conductive layer thereof forming a first electrode, around the central positioning point thereof. It further comprises, following the attachment of each transducer, a step of machining the free upper conductive layer of at least one of the transducers, using a machine tool, at least as far as a piezoelectric intermediate layer of this transducer, in order to form a second electrode of this transducer, centering it around the central positioning point thereof.