Vehicle Display Decorative Part Mirror Surface Roughness Control
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Solution Overview
Problem
Conventional decorative parts for vehicle display devices lack the ability to effectively create a luxurious feeling for viewers, as they do not adequately enhance the visual appeal and tactile experience.
Innovation Solution
A decorative part for vehicle display devices featuring a substrate body molded from black synthetic resin with a mirror surface and grooves, where the mirror surface roughness and wavelength ratio are specifically optimized to create a luxurious appearance, and the grooves are designed to provide a tactile experience similar to metal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional decorative part with translucent substrate and metal film is used, then the basic decorative function is achieved, but the luxurious feeling for viewers is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mirror surface roughness (0.01-0.35 μm) and wavelength ratio (1:600 to 1:6000) of the black synthetic resin substrate. These parameter optimizations transform the ordinary plastic surface into one that visually and tactilely resembles polished metal, achieving a luxurious feeling without requiring actual metal materials or complex multi-layer coatings.
Solution Approach 2:
The patent replaces expensive metal materials with inexpensive black synthetic resin. By using molding processes to create the substrate with controlled surface characteristics, the invention achieves metal-like luxurious appearance and tactile sensation at a fraction of the cost, eliminating the need for metal films, primers, and complex lamination processes.
2Illumination intensity
If the mirror surface roughness is reduced to create a glossy appearance, then the luxurious visual effect is improved, but the tactile experience may become less realistic
Solution Approach 1:
The patent optimizes the mirror surface roughness parameter to a specific range (0.01-0.35 μm) that simultaneously achieves high glossiness for visual appeal and appropriate tactile characteristics. This parameter control ensures that the surface feels realistic to the touch while maintaining the luxurious glossy appearance, resolving the contradiction between visual and tactile requirements.
3Loss of information
If the wavelength ratio is optimized to reduce image distortion, then the visual clarity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a wavelength ratio range (1:600 to 1:6000) that effectively minimizes image distortion on the mirror surface. By controlling the surface geometry parameters during molding, the invention achieves high visual clarity without requiring excessively tight manufacturing tolerances, as the specified range provides optimal balance between optical performance and manufacturability.
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 effectively enhances the luxurious feeling for viewers by reducing image distortion and creating a glossy, tactile experience akin to fine piano black, while maintaining cost-effectiveness and quality consistency.
Implementation Method 1
a mirror surface that is formed on a surface of the substrate body, wherein the mirror surface is formed so that mirror surface roughness becomes larger than 0 and equal to or smaller than 0.35 μm and a ratio of a wavelength becomes equal to or larger than 1:600 and equal to or smaller than 1:6000
Data Source
AI summary
A decorative part for a vehicle display device includes a substrate body that is molded by synthetic resin and a mirror surface that is formed on a surface of the substrate body, in which the mirror surface is formed so that mirror surface roughness becomes larger than 0 and equal to or smaller than 0.35 μm and a ratio of a wavelength becomes equal to or larger than 1:600 and equal to or smaller than 1:6000 in the case of an amplitude of 1, the amplitude being captured by a ratio of the amplitude corresponding to an average height of an undulation waveform and the wavelength corresponding to an average length of the undulation waveform in an undulation curve in which a cutoff value from a surface shape is 250 μm.