Pressure-Sensitive Sensor Deformation Layer Design for Load Sensitivity
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Solution Overview
Problem
Existing sensors for electronic apparatuses face challenges in improving dynamic range in load sensitivity, particularly due to variations in housing dimensions and mounting restrictions, which can lead to reduced sensitivity and accuracy in detecting input operations.
Innovation Solution
The implementation of a pressure-sensitive sensor with a capacitive sensor electrode unit, including a sensing unit and a reference electrode layer, where a first deformation layer with specific elastic modulus, thickness, and area occupancy relationships is disposed between the sensor and the exterior body or support body, enhancing the dynamic range in load sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure-sensitive sensor is used for detecting input operations, then detection capability is provided, but dynamic range in load sensitivity is reduced due to housing dimension variations
Solution Approach 1:
The patent applies parameter changes by carefully controlling the elastic modulus, thickness, and area occupancy of the deformation layer to optimize the sensor's response characteristics. By adjusting these parameters, the sensor maintains high load sensitivity across different housing dimensions and mounting conditions, resolving the contradiction between measurement precision and adaptability.
Solution Approach 2:
The deformation layer acts as an intermediary element between the housing and the sensor electrode unit. This intermediary structure compensates for dimensional variations in the housing by deforming itself, thereby maintaining consistent contact pressure and sensitivity across different mounting conditions.
2Measurement precision
If deformation layer is added to improve sensitivity, then load sensitivity is enhanced, but deformation layer crushing occurs
Solution Approach 1:
The patent specifies precise parameter ranges for the deformation layer including elastic modulus (0.01-10 MPa), thickness (1-100 μm), and area occupancy (10-90%) to optimize both sensitivity and crushing resistance. These parameter controls ensure the deformation layer is soft enough to maintain contact sensitivity but structurally sound to prevent crushing.
Solution Approach 2:
The deformation layer is formed using conductive rubber or conductive polymer composite materials that combine electrical conductivity with elastic deformation properties. These composite materials provide both the necessary sensitivity response and mechanical strength to prevent crushing under operational loads.
3Measurement precision
If second deformation layer is placed between reference electrode layer and sensor electrode unit, then sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the deformation layer function with the electrode structure by integrating the second deformation layer directly between the reference electrode layer and sensor electrode unit. This integration combines multiple functions (deformation compensation, electrical insulation, and sensitivity enhancement) into a unified structure, reducing overall device complexity despite the added layer.
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 configuration effectively suppresses deformation layer crushing and improves sensitivity by maintaining the dynamic range in load sensitivity, allowing for accurate detection of input operations despite variations in housing dimensions.
Implementation Method 1
the pressure-sensitive sensor includes a capacitive sensor electrode unit including a sensing unit, a reference electrode layer, and a second deformation layer disposed between the reference electrode layer and the sensor electrode unit
Implementation Method 2
a first deformation layer disposed at least either between the first surface and the exterior body or between the second surface and the support body, in which the pressure-sensitive sensor includes... the first deformation layer and the second deformation layer satisfy at least one of relationships represented by the following formulas (1) to (3). Elastic modulus of first deformation layer≤elastic modulus of second deformation layer
Data Source
AI summary
An electronic apparatus includes: an exterior body; a pressure-sensitive sensor having a first surface and a second surface; a support body supporting the pressure-sensitive sensor such that the exterior body faces the first surface; and a first deformation layer disposed at least either between the first surface and the exterior body or between the second surface and the support body. The pressure-sensitive sensor includes a capacitive sensor electrode unit including a sensing unit, a reference electrode layer, and a second deformation layer disposed between the reference electrode layer and the sensor electrode unit. The first deformation layer and the second deformation layer satisfy a predetermined relationship.