Pressure Sensor Elastic Layer Tolerance Compensation
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Solution Overview
Problem
The accumulation of tolerances in components during the assembly of micro pressure sensors in electronic devices, such as mobile telephones, poses challenges in ensuring accurate assembly and mass production, particularly due to processing conditions and cost constraints.
Innovation Solution
Embedding a pressure sensor within an inner elastic layer, which is then embedded in an outer elastic layer with different elastic moduli and Poisson's ratios, allows the elasticity of the layers to overcome assembly tolerances and optimize the sensor's response during touch events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tolerance control is used in component assembly, then manufacturing cost is reduced, but assembly precision deteriorates due to accumulation of tolerances
Solution Approach 1:
The patent changes the physical parameters of the elastic layers by selecting materials with different elastic moduli and Poisson's ratios. The first elastic layer has a higher elastic modulus than the second elastic layer, creating a gradient structure that compensates for tolerance accumulation through controlled elastic deformation, thereby maintaining assembly precision while using cost-effective tolerance control methods
Solution Approach 2:
The patent employs a composite structure consisting of two elastic layers with different material properties. The first elastic layer (higher elastic modulus) and second elastic layer (lower elastic modulus) work together to distribute and compensate for tolerances, achieving both cost-effectiveness and high assembly precision through the synergistic effect of composite materials
2Manufacturing precision
If elastic layers with different elastic moduli are used, then assembly tolerance compensation is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different elastic moduli to different regions (layers) of the elastic body. The first elastic layer has a higher elastic modulus than the second elastic layer, creating localized property variations that specifically target tolerance compensation at the sensor interface while keeping the overall structure relatively simple
3Measurement precision
If force state optimization is performed during assembly, then sensor response accuracy is improved, but assembly process complexity increases
Solution Approach 1:
The patent optimizes sensor response accuracy by carefully selecting and controlling the elastic modulus and Poisson's ratio parameters of the two elastic layers. The first elastic layer has a higher elastic modulus than the second, creating an optimized force distribution that enhances sensor response without requiring complex assembly processes
Solution Approach 2:
The patent incorporates preliminary action by pre-configuring the elastic layers with specific material properties before assembly. The different elastic moduli and Poisson's ratios are established in advance, allowing the structure to automatically optimize force state and sensor response during normal operation without requiring complex real-time adjustments during assembly
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 correct assembly of pressure sensors in mass production by mitigating tolerance accumulation between components, improving recognition accuracy, and facilitating adjustable force properties for enhanced sensor performance.
Implementation Method 1
the elasticity of the elastic layers is used to overcome any assembly tolerances
Implementation Method 2
micro pressure sensors
Data Source
AI summary
An apparatus for use in the assembly of an electronic device, such as a mobile telephone, comprises a pressure sensor. The pressure sensor is embedded within an inner elastic layer and the inner elastic layer is embedded within an outer elastic layer. The inner elastic layer has an elastic modulus which is greater than the elastic modulus of the outer elastic layer.