Motor Vehicle Trim Panel Variable Thickness Support Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle trim panels with light sources under a support layer suffer from light scattering due to the crystallinity or charge of the polymeric material, resulting in an imprecise and unsatisfactory aesthetic effect for illuminated pictograms.
Innovation Solution
A trim panel design with a support layer having varying thicknesses around and opposite the pictogram area, where the thinner section reduces light diffusion, combined with a mask to control light passage and a glass-filled polymer material for minimal light disturbance, ensuring precise illumination and a clear image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light passes through a support layer of uniform thickness, then the structure is simple and easy to manufacture, but light scattering occurs due to crystallinity or charge of the polymeric material, resulting in imprecise pictogram illumination
Solution Approach 1:
The support layer is designed with variable thickness: a first thickness in zones surrounding the pictogram-forming zone and a second thickness (less than the first) in zones opposite the pictogram-forming zone. This local variation in thickness reduces light scattering in the critical pictogram area while maintaining structural integrity elsewhere, thereby improving pictogram illumination precision without requiring complete structural redesign.
Solution Approach 2:
The solution transitions from a two-dimensional uniform thickness plan to a three-dimensional variable thickness profile. By introducing thickness variation along the Z-axis (depth dimension), the patent achieves better light control and reduced scattering while maintaining a relatively simple overall structure that can be manufactured using conventional molding techniques.
2Manufacturing precision
If the support layer thickness is reduced opposite the pictogram area, then light diffusion is minimized and pictogram clarity is improved, but the structural support may be compromised
Solution Approach 1:
The support layer maintains a first thickness in zones surrounding the pictogram-forming zone to provide structural support, while having a second reduced thickness only in zones opposite the pictogram-forming zone where light transmission is critical. This localized thickness variation ensures that structural strength is preserved in non-critical areas while achieving minimal light diffusion in the pictogram area.
Solution Approach 2:
The support layer is made from glass-filled polymer material, which provides enhanced mechanical strength and dimensional stability. The glass filler particles reinforce the polymer matrix, allowing the support layer to maintain adequate structural strength even in regions where the thickness is reduced to minimize light scattering.
3Manufacturing precision
If a mask is added to control light passage, then pictogram definition is improved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The mask is integrated with either the translucent skin or the support layer, forming a single combined component rather than a separate assembly. This integration reduces the number of discrete parts and simplifies manufacturing, while still achieving the desired light control function for precise pictogram boundary definition.
Solution Approach 2:
The mask serves multiple functions: it defines the pictogram boundaries, controls light passage, and can be incorporated into the structural layers of the trim panel. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity.
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 a clearly defined and aesthetically pleasing illuminated pictogram by minimizing light diffusion within the support layer, maintaining a uniform appearance and preventing overflow light, thus enhancing the visual impact and aesthetic appeal.
Implementation Method 1
the light source is placed under the support layer. The light therefore passes through the support layer then the translucent skin
Implementation Method 2
The light therefore passes through the support layer then the translucent skin where it is diffused according to the shape of the pictogram
Implementation Method 3
passing light through the support layer also results in light scattering within it due to the crystallinity or charge of the polymeric material forming the support layer
Implementation Method 4
the support layer is made of a glass-filled polymer material
Data Source
Figure 1~2
AI summary
This panel (1) includes at least one zone (10) forming a pictogram (12), said pictogram (12) being illuminated by means of a light source (14) placed beneath the lining panel (1), the lining panel (1) having a translucent skin (2) forming the external surface (8) of the lining panel (1) and a support layer (4) placed against the skin (2) between the light source (14) and at least the zone (10) forming a pictogram (12).The support layer (4) has at least a first thickness (e1 ) around the zone (10) forming the pictogram (12) and at least a second thickness (e2) facing the zone (10) forming the pictogram (12), the second thickness (e2) being smaller than the first thickness (e1).