Vehicle Door Light Guide Structure for Uniform Linear Luminance
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Solution Overview
Problem
Existing vehicle illumination devices face challenges in achieving uniform luminance along a linear light-emitting face, productivity in manufacturing light guide bodies, and suppressing rubbing sounds between the light guide body and lens due to vibration, while also restricting the shape of the light guide body.
Innovation Solution
A vehicle illumination device featuring a long light guide body with projecting or recess parts arranged in a longitudinal direction, where the length of these parts changes with distance from the light source, and a contact body with surface texture to reduce frictional vibration, allowing for improved luminance and reduced production costs while enhancing the light guide body's fixation and shape flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If incisions are formed in the back face of the light-emitting face to achieve uniform luminance, then luminance uniformity is improved, but manufacturing complexity and cost increase due to additional cutting operations
Solution Approach 1:
The patent applies preliminary action by forming the light-emitting face with varying thickness during the initial molding process rather than performing subsequent cutting operations. The mold includes a variable thickness portion that creates the required thickness variation in one step, eliminating the need for separate incision cutting steps and achieving uniform luminance distribution without additional manufacturing complexity
Solution Approach 2:
The patent changes the physical parameter of the light-emitting face thickness to achieve uniform luminance. By varying the thickness of the light-emitting face in the longitudinal direction (thinner near the light source, thicker farther away), the light extraction is optimized along the length of the light guide body, producing uniform luminance distribution without requiring incisions
2Stability of the object's composition
If the light guide body is fitted into a groove of the lens for fixation, then positioning is improved, but rubbing sounds occur due to frictional vibration under vehicle body vibration
Solution Approach 1:
The patent applies local quality by adding protrusions at specific locations on the light guide body that engage with corresponding recesses in the lens. This localized engagement structure provides stable positioning while eliminating the continuous surface contact that causes frictional vibration and rubbing sounds in groove-based fixation systems
Solution Approach 2:
Instead of fitting the light guide body into a groove of the lens (lens-centric fixation), the patent inverts the approach by having the light guide body provide protrusions that actively engage with the lens structure. This reversal of the fixation mechanism eliminates the rubbing sound problem while maintaining positioning stability
3Reliability
If a channel is formed in the light guide body for fixation with a claw, then fixation reliability is improved, but the shape of the light guide body is restricted
Solution Approach 1:
The patent applies segmentation by dividing the fixation function into separate protrusion elements distributed along the light guide body rather than requiring a continuous channel. These discrete protrusions can be strategically placed to provide reliable fixation while maintaining the flexibility to optimize the light guide body's shape for light extraction and aesthetic purposes without being constrained by a channel structure
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 uniform luminance, reduces production costs, suppresses rubbing sounds, and allows for better fixation and shape flexibility of the light guide body, enhancing both functionality and aesthetics in vehicle illumination.
Implementation Method 1
a long light guide body that extends linearly in a direction of entry of light from one end and radiates light from a linear light-emitting face
Implementation Method 2
a contact body with surface texture to reduce frictional vibration
Data Source
AI summary
A vehicle illumination device includes a light source and a long light guide body that extends linearly in a direction of entry of light from one end thereof disposed so as to be adjacent to the light source and radiates light from a linear light-emitting face, the light guide body having formed thereon projecting parts arranged in a longitudinal direction on a back face of the light-emitting face and extending in a direction orthogonal to the direction of entry of light. The widths of the projecting part vary in accordance with the distance from the light source. Provided is a vehicle illumination device that enables light emission with uniform luminance in the longitudinal direction to be realized while improving the productivity of a light guide body.