Seat Belt Webbing With Invisible Pattern and Uniform Color
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Solution Overview
Problem
Current methods for manufacturing seat belt webbing with invisible markers are elaborate and costly, resulting in a non-uniform color impression due to the use of expensive marker materials that are optically distinguishable from the webbing material in the visible range.
Innovation Solution
A method involving the use of two yarns that reflect light differently in the invisible spectrum, with the webbing being overdyed to create a uniform appearance in the visible range, allowing the pattern to be retained and detectable in the invisible spectrum, enabling cost-effective manufacturing and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the webbing is marked with expensive marker material in portions corresponding to the pattern, then the pattern can be detected in the invisible spectral range, but the manufacturing cost increases and the color impression becomes non-uniform
Solution Approach 1:
The patent changes the optical parameters of the yarns by selecting materials with different reflectance properties in the invisible spectral range (e.g., infrared). The first yarn has high reflectance while the second yarn has low reflectance in the invisible range, allowing pattern detection without using expensive marker materials. This parameter change enables cost-effective manufacturing while maintaining detection capability.
Solution Approach 2:
The patent applies local quality by creating spatial variation in the webbing structure itself through the arrangement of different yarns (first yarn with high invisible reflectance and second yarn with low invisible reflectance) to form the pattern. This eliminates the need for additional marker materials while achieving the detection function through the webbing's own structural properties.
2Measurement precision
If the webbing is marked with expensive marker material in portions corresponding to the pattern, then the pattern can be detected in the invisible spectral range, but the color impression becomes non-uniform
Solution Approach 1:
The patent changes the optical parameters by selecting yarn materials with different reflectance properties in the invisible spectral range. The first yarn reflects invisible light strongly while the second yarn reflects it weakly, enabling pattern detection. In the visible range, both yarns are dyed uniformly, ensuring color homogeneity. This parameter separation allows simultaneous achievement of detection capability and visual uniformity.
Solution Approach 2:
The patent separates the detection function from the visual appearance function by operating in different spectral dimensions. The pattern detection is achieved in the invisible spectral range (e.g., infrared) through differential yarn reflectance, while the visual appearance in the visible range remains uniform due to uniform dyeing. This dimensional separation resolves the contradiction between detection capability and color uniformity.
3Stability of the object's composition
If the webbing is overdyed to create uniform visible appearance, then the color impression becomes homogenous, but the pattern detectability in invisible spectrum must be preserved
Solution Approach 1:
The patent changes the optical parameters of the yarns by selecting materials whose reflectance difference in the invisible spectral range persists after overdying. The first and second yarns are chosen such that their differential reflectance in the invisible range (e.g., infrared) is maintained even after applying the uniform visible dye, ensuring both color uniformity and pattern detectability are achieved simultaneously.
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 method ensures a uniform color impression in the visible range while allowing for pattern detection in the invisible spectrum, facilitating low-cost production and enhanced visibility for camera-based systems, thereby improving the manufacturing efficiency and appearance of seat belt webbing.
Implementation Method 1
the first yarn and the second yarn reflecting light in the spectrum invisible to humans with different intensity
Implementation Method 2
The material by which the webbing is overdyed is opaque in the visible spectrum, while in the invisible spectrum it is partially transparent
Data Source
AI summary
A method for manufacturing a webbing (20) for a seat belt system in a vehicle comprises the following steps of: weaving the webbing (20) using a first yarn (30) and a second yarn (32), the first yarn (30) and the second yarn (32) reflecting light in the spectrum invisible to humans with different intensity, wherein the first and second yarns (30, 32) form a pattern (36), and overdying the webbing (20) so that the webbing (20) reflects light in the spectral range visible to humans in such a way that it has a homogenous appearance for humans. Moreover, such a webbing (20) and a vehicle comprising such a webbing (20) are provided.