Capacitance Module Anti-Warping Segments for Thermal Stability
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Solution Overview
Problem
Capacitive sensors often warp and delaminate due to differing thermal expansion rates of their layers during manufacturing processes involving heat.
Innovation Solution
Incorporation of anti-warping segments on the component layer with a coefficient of thermal expansion matching the shield layer, positioned around the antenna to minimize eddy currents and ensure uniform thermal expansion, thereby preventing warping and delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat is applied to the layers during manufacturing processes, then bonding between layers is achieved, but the layers expand at different rates causing warping
Solution Approach 1:
The patent applies thermal expansion principles by designing the component layer with strategic openings that allow differential thermal expansion of underlying layers during heating processes. The openings are positioned and sized to compensate for the different expansion rates of the sensor layer, shield layer, and component layer, thereby preventing warping while maintaining bonding strength.
2Reliability
If a continuous conductive layer is used on the component layer, then electrical connectivity is improved, but eddy currents are formed when the antenna is activated
Solution Approach 1:
The patent segments the conductive material on the component layer by creating strategic openings that divide what would otherwise be a continuous conductive layer into separate regions. This segmentation prevents the formation of closed loops that would generate eddy currents when exposed to electromagnetic fields from the antenna, while still maintaining necessary electrical connectivity through controlled pathways.
3Ease of manufacture
If the coefficient of thermal expansion of the component layer is different from the shield layer, then manufacturing flexibility is maintained, but warping and delamination occur during heating
Solution Approach 1:
The patent modifies the thermal expansion characteristics of the component layer by designing openings with specific geometries, sizes, and distributions. These parameter changes allow the component layer to accommodate the thermal expansion differences between layers during manufacturing heating processes, preventing warping and delamination while preserving manufacturing flexibility through the ability to adjust opening parameters.
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 anti-warping segments effectively stabilize the component layer's thermal expansion, reducing warping and delamination, enhancing sensor reliability and performance.
Implementation Method 1
The anti-warping segments may have the characteristic of minimizing a formation of eddy currents when the antenna is activated
Implementation Method 2
The anti-warping segments may have the characteristic of causing the component layer to have a closer coefficient of thermal expansion to the shield layer
Data Source
AI summary
A capacitance module may include a sensor layer having a set of electrodes; a component layer having a controller in communication with the set of electrodes; a shield layer positioned between the sensor layer and the component layer; an antenna disposed on the component layer; and anti-warping segments adjacent to the antenna and disposed on the component layer. The anti-warping segments may be electrically isolated from each other.