Soft Vehicle Door Trim Switch Assembly
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Solution Overview
Problem
Conventional vehicle door trim switch devices embedded in hard substrates damage the transparent skin and fail to display symbols effectively, making it difficult for drivers to check lock/unlock status from outside the vehicle.
Innovation Solution
A soft upper trim for vehicle doors is manufactured with an injection-molded upper substrate featuring a first through-hole for a switch module, vacuum-pressed needle-punched porous foam, and a light guide plate with engraved symbols, which is then laminated with a transparent skin using in-mold grain molding to maintain the skin's continuity and display symbols clearly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch device is embedded in a hard substrate, then the switch structure is stable, but the transparent skin is damaged and symbol visibility is poor
Solution Approach 1:
The door trim is divided into multiple substrates (upper substrate, center substrate, lower substrate) that are connected together. The switch device is embedded in the hard upper substrate, while the transparent skin is laminated on the foam layer, separating the switch mounting function from the skin protection function to prevent skin damage.
Solution Approach 2:
The door trim uses a composite structure combining hard substrates (for switch embedding), foam material (for cushioning and skin support), and transparent skin (for aesthetic coverage). This multi-material approach allows the switch to be stable while the skin remains intact and visible.
2Ease of manufacture
If holes are formed in the transparent skin and foam for switch insertion, then the switch can be mounted, but the transparent skin continuity is broken and appearance is degraded
Solution Approach 1:
The door trim is segmented into multiple layers (substrate, foam, skin) with the switch embedded in the substrate layer. This allows switch installation without creating holes through the transparent skin, preserving skin continuity and appearance.
3Reliability
If the switch is embedded deep in the substrate, then the switch is protected, but drivers cannot check symbols through the window
Solution Approach 1:
The transparent skin allows light transmission, making the switch symbols visible from outside the vehicle through the window. The skin's optical properties enable both protection of the embedded switch and visibility of the symbols for driver awareness of lock/unlock status.
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 ensures the transparent skin remains undamaged, allows drivers to view symbols from outside the vehicle, and provides an improved external appearance with enhanced symbol clarity and hidden switch module integration.
Implementation Method 1
an adhesive, which penetrates into a porous structure of the foam, is injected into a mold
Implementation Method 2
a transparent skin is laminated on upper surfaces of the porous foam and a light guide plate after a first through-hole
Data Source
AI summary
Provided is a soft upper trim of a vehicle door, in which an upper substrate, a foam, and a transparent skin are laminated, and particularly, to a soft upper trim for switch assembly of a vehicle door, in which a switch, which is configured to preserve continuity of a transparent skin and display lock and unlock symbols on the transparent skin, is easily assembled to an upper substrate, and a method of manufacturing the same.