Capacitance Sensor Elastomer Bonding Homogeneity
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Solution Overview
Problem
Existing capacitance sensors face issues with non-uniform flexibility and stress concentration at adhesive bonds, leading to peeling and decreased sensitivity due to insufficient bonding techniques between elastomer layers.
Innovation Solution
A capacitance sensor design utilizing elastomer layers bonded with an adhesion layer made from the same material in a pre-curing state, ensuring uniform deformation and preventing peeling by using pillars for increased displacement and improved bonding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive bonding techniques are used between elastomer layers, then the sensor structure can be assembled, but stress concentration occurs and peeling easily happens
Solution Approach 1:
The patent applies homogeneity by using the same elastomer material for both the flexible layer and the adhesive bond. This ensures uniform deformation characteristics and prevents stress concentration at the bonding interface, thereby preventing peeling while maintaining bonding reliability.
Solution Approach 2:
The patent changes the parameter of material composition by making the adhesive bond from the same elastomer material as the flexible layer rather than using conventional different materials. This parameter change ensures matched deformation characteristics and eliminates stress concentration.
2Ease of manufacture
If different materials are used for the flexible layer and adhesive bond, then bonding can be achieved, but deformation characteristics do not match and flexibility differs
Solution Approach 1:
The patent uses the same elastomer material for both the flexible layer and adhesive bond, ensuring homogeneous deformation characteristics. This homogeneity guarantees uniform flexibility and consistent deformation behavior across the entire sensor structure.
3Ease of manufacture
If the adhesive bond has different flexibility than the flexible layer, then bonding is possible, but sensor sensitivity decreases
Solution Approach 1:
By using the same elastomer material for the adhesive bond and flexible layer, the patent ensures homogeneous flexibility characteristics. This eliminates any flexibility mismatch that would otherwise reduce sensor sensitivity, while still providing effective bonding.
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
The solution achieves uniform flexibility and enhanced detection accuracy by maintaining consistent stress characteristics across the bonding surface, preventing peeling and ensuring high sensitivity and dynamic range.
Implementation Method 1
the elastomer layer is bonded by an adhesion layer formed by applying an elastomer in a pre-curing state that is a material identical to the first layer or the second layer and curing the elastomer
Data Source
AI summary
A capacitance sensor made of a plurality of layers includes: a first layer including a first electrode; and a second layer including a second electrode and arranged to face the first layer, wherein at least one of the first layer and the second layer is an elastomer layer which is a dielectric and is made of an elastically deformable elastomer, and the elastomer layer is bonded by an adhesion layer formed by applying an elastomer in a pre-curing state that is a material identical to the first layer or the second layer and curing the elastomer.