Reinforced Housing for Touch Interface Gap Elimination
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Solution Overview
Problem
Existing touch detection devices in man-machine interfaces for vehicles suffer from aesthetic issues due to differences in thermal expansion between glass sensors and plastic housings, leading to unsightly clearances and cracks, which compromise the smooth and uniform appearance.
Innovation Solution
Incorporating a reinforcement means, such as a metal plate with a matching expansion coefficient, molded into the plastic casing to integrate with the touch detection means, and using a leveling trim to ensure a smooth interface between the sensor and the housing, while maintaining mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a glass sensor is placed in a plastic housing opening, then the device can be manufactured with different materials for functional requirements, but thermal expansion differences cause gaps and cracks that compromise appearance and reliability
Solution Approach 1:
A reinforcement element acts as an intermediary component between the glass sensor and plastic housing. This mediator absorbs the thermal expansion differential, preventing direct contact between incompatible materials while maintaining structural integrity and eliminating gaps.
Solution Approach 2:
The solution employs a composite structure combining plastic housing with a reinforcement element (metal or rigid material) that has appropriate thermal expansion properties. This composite approach allows the assembly to accommodate thermal stresses while maintaining a unified, gap-free appearance.
2Strength
If the housing rim significantly covers the sensor to provide mechanical support, then structural stability is improved, but a raised edge is created that compromises the smooth and uniform aesthetic appearance
Solution Approach 1:
The reinforcement element extends in multiple dimensions - providing vertical support structure while maintaining a flush horizontal surface. This dimensional approach allows mechanical strength without compromising the smooth aesthetic appearance of the front surface.
Solution Approach 2:
The reinforcement is localized to specific areas where structural support is needed, rather than creating a uniform raised edge around the entire sensor. This allows the surface to remain smooth and flush in visible areas while maintaining strength where required.
3Reliability
If operating clearance is maintained between sensor and housing periphery, then thermal expansion is accommodated, but unsightly gaps and holes are created that compromise appearance
Solution Approach 1:
The reinforcement element serves as a mediator that manages thermal expansion internally without creating visible gaps. It absorbs the expansion differential between materials while maintaining a continuous, uniform surface appearance from the user's perspective.
Solution Approach 2:
The thermal expansion management function is extracted from the visible surface area and placed within the reinforcement structure. This separates the functional requirement of accommodating expansion from the aesthetic requirement of maintaining a uniform appearance.
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 provides a visually smooth and uniform touch interface with enhanced mechanical resistance against thermal and mechanical stresses, eliminating perceivable gaps and cracks, and maintaining a sleek aesthetic.
Implementation Method 1
Since their coefficients of expansion differ, it is not possible to maintain a constant gap under all circumstances
Data Source
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AI summary
The invention relates to a man/machine interface (1) including a touch-sensitive detection means (2) and a housing (3). Said housing includes an edge (4) that defines an opening (5). Said touch-sensitive detection means (2) is placed into the housing (3) at least to the right of said opening (5), characterized in that the housing includes at least one reinforcement means (6).