Pressure-Sensing Button Structure for Constant Force Detection
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Solution Overview
Problem
Current piezoelectric ceramic devices in button applications have insufficient ability to detect constant force and cannot recognize pressure changes or sliding press positioning.
Innovation Solution
A piezoelectric transducer with a sheet-like piezoelectric ceramic, upper and lower elastic sheets, and resistive layers forming a bridge structure, which allows for the detection of pressure changes by measuring resistance value changes due to elastic sheet deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric ceramic devices use traditional bow or cymbal transducer structure bonded with glue, then the device structure is simple and manufacturing is easy, but the device cannot detect constant force and cannot recognize pressure changes or sliding press positioning
Solution Approach 1:
The elastic sheet is divided into multiple segments with bending portions, each segment containing resistive layers that can independently detect pressure changes. This segmentation allows the device to detect constant force and pressure changes while maintaining a manageable structure.
Solution Approach 2:
The patent changes the structural parameters of the elastic sheet by introducing bending portions and spacing from the piezoelectric ceramic, and changes the electrical parameters by incorporating resistive layers arranged in bridge structures. These parameter changes enable constant force detection and pressure change recognition.
2Adaptability or versatility
If piezoelectric ceramic devices use traditional bow or cymbal transducer structure, then the manufacturing process is simple, but the device cannot realize gesture functions such as detecting pressure changes to recognize sliding press positioning
Solution Approach 1:
The elastic sheet structure with bending portions and resistive layers serves multiple functions: it detects constant force, pressure changes, and enables gesture recognition for sliding press positioning. This multi-functional design allows a single structure to replace what would traditionally require multiple separate components.
Solution Approach 2:
The resistive layers act as intermediaries between the mechanical deformation of the elastic sheet and the electrical signals needed for gesture recognition. These layers convert physical pressure changes into measurable electrical resistance changes, enabling versatile gesture functions.
3Measurement precision
If the elastic sheet is fixed closely to the piezoelectric ceramic, then the structural stability is high, but the ability to detect pressure changes and external forces is reduced
Solution Approach 1:
The elastic sheet is fixed to the piezoelectric ceramic only at specific locations (ends of the sheet), while the central bending portions remain spaced from the ceramic. This local fixation approach provides stability at the boundaries while maintaining detection sensitivity in the active bending regions.
Solution Approach 2:
The patent introduces spacing in the vertical dimension between the elastic sheet and piezoelectric ceramic, creating a gap that allows the elastic sheet to deform freely in response to pressure changes. This dimensional separation maintains structural stability through endpoint fixation while enabling pressure detection sensitivity.
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
Enables the detection of pressure changes and external forces applied to a pressure sensing button, enhancing its functionality to recognize sliding press positioning and enriching user experience.
Implementation Method 1
A piezoelectric ceramic having a sheet-like shape
Implementation Method 2
the bending portion of the elastic sheet will shrink and deform when it is subjected to pressure, and the deformation triggers the deformation of the resistive layer, and the resistive layer under deformation induces a linear change in resistance value
Data Source
AI summary
The present disclosure provides a piezoelectric transducer and a pressure sensing button. The piezoelectric transducer includes as follows: A piezoelectric ceramic having a shape of a sheet. An upper elastic sheet and a lower elastic sheet disposed on two opposite sides of the piezoelectric ceramic, respectively. Two ends of the upper elastic sheet are fixed to an upper surface of the piezoelectric ceramic. Two ends of the lower elastic sheet are fixed to a lower surface of the piezoelectric ceramic. A plurality of resistive layers fixed to the upper elastic sheet and the lower elastic sheet, respectively, and the plurality of resistive layers are electrically connected to each other to form a bridge structure. The piezoelectric transducer of the present disclosure can recognize the external force applied to the pressure sensing button through the resistance change and realize the pressure change detection.