Vehicle Interior Trim Layering for Reflective Depth and Light Transmission

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Solution Overview

Problem

Existing trim elements for vehicle interiors lack aesthetic appeal and depth effect, with previous designs failing to effectively combine reflective and light-transmissive properties to create a visually engaging appearance.

Innovation Solution

A multi-layer trim element structure comprising a reflective and light-transmissive first cover layer, a light-transmissive first decorative layer, an intermediate layer, and optionally a second decorative layer, which can be illuminated from the inside, creating a depth effect through reflective and light-transmissive interactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a reflective cover layer is used to enhance aesthetic appearance, then visual appeal is improved, but light transmission is reduced

Engineering Contradiction:
Improvevisual appealVSAvoidlight transmission
Core Design Contradiction:
Illumination intensityVSQuantity of substance

Solution Approach 1:

The cover layer is divided into multiple segments or zones with different optical properties. Some regions are reflective while others are light-transmissive, allowing the trim element to display both reflective aesthetics and light transmission simultaneously. This segmentation resolves the contradiction by spatially separating the conflicting functions within the same component.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Different regions of the cover layer are assigned different local qualities - some areas have reflective properties for aesthetic enhancement while other areas maintain light-transmissive properties. This local differentiation allows the trim element to achieve both visual appeal and light transmission without requiring a complete compromise across the entire surface.

Inventive Principle:
Principle #3Local quality

2Illumination intensity

If multiple layers are added to create depth effect, then aesthetic appearance is improved, but structural complexity increases

Engineering Contradiction:
Improvedepth effectVSAvoidstructural complexity
Core Design Contradiction:
Illumination intensityVSDevice complexity

Solution Approach 1:

The trim element employs a nested multi-layer structure where decorative layers, intermediate layers, and cover layers are arranged concentrically or sequentially. Each layer is positioned within or adjacent to the previous layer, creating a compact depth effect while maintaining relatively streamlined construction. The nesting approach allows complex optical effects to be achieved through layered arrangement rather than bulky assembly.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

The trim element utilizes composite material structures combining different optical properties in a single integrated assembly. By using composite layers with varying transparency, reflectivity, and decorative characteristics, the design achieves depth effects and aesthetic enhancement without requiring separate discrete components for each function, thereby managing structural complexity.

Inventive Principle:
Principle #40Composite materials

3Quantity of substance

If a decorative layer with through holes is used to achieve light transmission, then light transmission is improved, but structural integrity is reduced

Engineering Contradiction:
Improvelight transmissionVSAvoidstructural integrity
Core Design Contradiction:
Quantity of substanceVSStrength

Solution Approach 1:

The decorative layer incorporates a porous or perforated structure with through holes that allow light transmission while maintaining structural integrity. The porous design enables optical functionality without completely compromising the mechanical strength of the layer, as the remaining material provides sufficient structural support. This approach resolves the contradiction by optimizing the balance between openness for light transmission and material continuity for strength.

Inventive Principle:
Principle #31Porous materials

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 trim element achieves a unique aesthetic appearance with a depth effect by combining reflective and light-transmissive layers, enhancing visual appeal and providing adjustable illumination effects.

Implementation Method 1

the first cover layer is reflective in part and light-transmissive in part

Methodology Applied
Scientific EffectReflection: Reflection

Implementation Method 2

light-transmissive in part and has a transmittance of up to 40%

Methodology Applied
Scientific EffectLight transmission: Light

Data Source

PatentUS12466311B2Trim element with partially reflective top layer
Publication Date: 2025.11.11 JOYSONQUIN AUTOMOTIVE SYST GMBH
  • US12466311B2 patent drawing

AI summary

Trim element, in particular for a vehicle interior, with a multi-layer structure having a visible side and a carrier side, wherein the trim element comprises the following layers: a first cover layer, optionally a second cover layer which is arranged on the carrier side of the first cover layer and is light-transmissive, a first decorative layer which is arranged on the carrier side of the first cover layer and the second cover layer and is light-transmissive at least in part, an intermediate layer which is arranged on the carrier side of the first decorative layer and is light-transmissive, a second decorative layer which is arranged on the carrier side of the first intermediate layer, and optionally a carrier layer which is arranged on the carrier side of the second decorative layer. The trim element is characterized in that the first cover layer is reflective at least in part and light-transmissive at least in part.