Thixotropic Liquid Coating for Moisture Protection in Force-Sensitive Resistors
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Solution Overview
Problem
Force-sensitive resistors are prone to moisture ingress through their vents, leading to short circuits and degradation, especially in wet or high-humidity environments, and conventional protection methods impede air flow and are difficult to modify.
Innovation Solution
Coating at least one conductive element of the electronic device with a non-conductive thixotropic liquid that decreases viscosity under stress, allowing for air and moisture displacement while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid compound is applied to cover the target area and cured to form a solid barrier, then moisture ingress protection is improved, but air flow and contact between conductive elements are impeded
Solution Approach 1:
The patent changes the physical state parameter of the protective material from solid (conventional cured compound) to liquid (thixotropic compound). This liquid state allows the material to flow and disperse when air moves through the sensing chamber, preventing impeded air flow and contact between conductive elements, while still providing moisture protection when stationary
Solution Approach 2:
The patent uses a thixotropic liquid compound that exhibits non-Newtonian fluid properties, combining characteristics of both liquids (flowability) and solids (protective barrier). This composite material behavior allows it to provide moisture protection while dynamically responding to air flow conditions within the sensing chamber
2Reliability
If a solid barrier is formed by curing the liquid compound, then moisture protection is improved, but subsequent manipulation and access to the encapsulated area become difficult
Solution Approach 1:
The patent maintains the protective material in a liquid thixotropic state rather than curing it to a solid state. This parameter change ensures the material remains manipulable and accessible for future repairs or modifications while continuing to provide effective moisture protection through its liquid barrier properties
3Reliability
If a solid barrier is created to protect from moisture, then moisture ingress is prevented, but heat dissipation is adversely affected
Solution Approach 1:
The patent changes the protective material from solid to liquid thixotropic state, which fundamentally alters its thermal properties. The liquid state provides superior thermal conductivity compared to solid cured compounds, enabling effective heat dissipation from the sensing chamber while maintaining moisture protection through the liquid barrier
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 thixotropic liquid provides a protective layer against moisture ingress while enabling normal operation of force-sensitive resistors by displacing and re-coating as the device compresses and decompresses, reducing the risk of short circuits and maintaining accurate readings.
Implementation Method 1
coating at least one conductive element of the electronic device with a non-conductive thixotropic liquid that decreases viscosity under stress
Data Source
AI summary
A method includes coating at least one conductive element of an electronic device with an electrically non-conductive thixotropic liquid. An electronic device includes a first layer including an upper conductive element, a second layer including a lower conductive element, and a spacer positioned between the layers. The first layer, the second layer, and the spacer define a sensing chamber in which the upper and lower conductive elements move to vary the resistance of the electronic device. A non-conductive thixotropic liquid is present within the sensing chamber. Movement of the layers toward each other displaces the thixotropic liquid from an initial state coating at least one of the conductive elements to permit contact between the conductive elements, and movement of the first layer and the second layer away from each other returns the thixotropic liquid to the initial state.