Sun Visor Mirror Layout for Gap-Free Diffused Lighting
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Solution Overview
Problem
Existing vehicle sun visors with integrated lighting devices suffer from gaps between light guide plates, which can trap dust and deflect or block light, leading to potential dazzle and reduced functionality.
Innovation Solution
A vehicle sun visor design where the light guide plate and mirror plate are stacked, with a diffusion member integrated into the mirror plate to eliminate gaps, ensuring light is diffused at appropriate angles without being blocked or deflected by dust, and the light source is hidden from view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light guide plate and mirror plate are placed adjacent to each other with a gap, then assembly is easier, but light is blocked or deflected by air or dust in the gap
Solution Approach 1:
The light guide plate and mirror plate are integrated into a single unified structure, eliminating the gap between them. This merging prevents light blockage and deflection by air or dust while maintaining optical performance consistency.
Solution Approach 2:
A diffusion member is introduced as an intermediary component between the light guide plate and mirror plate. This diffusion member fills the potential gap and serves as a mediator that prevents direct contact issues while maintaining optical function.
2Illumination intensity
If the light source is exposed, then light output is maximized, but user dazzle occurs
Solution Approach 1:
The mirror plate is designed with spatially varying properties: a mirror region with reflective film for light reflection, a luminous region for light transmission, and a diffusion member for light scattering. This local quality differentiation allows the system to maximize light output in certain areas while preventing dazzle in user-facing areas.
Solution Approach 2:
The mirror plate is segmented into distinct functional regions: a mirror region covering the light source and first exit surface, and a luminous region covering the second exit surface. This segmentation allows different parts of the plate to perform different functions - reflecting light away from the source while allowing controlled light transmission in other areas.
3Adaptability or versatility
If multiple separate components are used, then functionality is enhanced, but device complexity increases
Solution Approach 1:
Multiple functional components (light guide plate, mirror plate, diffusion member) are merged into a single integrated mirror plate structure. This reduces the overall component count and assembly complexity while maintaining all necessary functions through spatial differentiation of regions within the unified structure.
Solution Approach 2:
The mirror plate serves multiple functions simultaneously: it acts as a reflective surface in the mirror region, a light transmission medium in the luminous region, and a diffusion element through the integrated diffusion member. This multi-functionality reduces the need for separate components.
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 design prevents light from being deflected by dust, maintains even brightness, and reduces the risk of dazzle, while minimizing component count and assembly complexity.
Implementation Method 1
A reflective film constituting a mirror is attached to a back surface of the mirror region of the mirror plate
Implementation Method 2
a diffusion member is placed in direct and close contact with a back surface of the luminous region of the mirror plate, and the diffusion member diffuses light from the light guide plate toward the front side
Implementation Method 3
A light guide plate through which light from the light source can pass is installed on the front side of the light source
Data Source
AI summary
A vehicle sun visor has a light source on a light guide plate back side allowing light to be emitted, a visor main body, and a light source inside the body. A light guide plate is installed on a light source front side. The plate has a first exit surface reflecting light inside the plate from a back surface. A second exit surface reflecting light passing along the plate is formed on its back surface. A mirror plate is installed alongside on the plate front side, and has a mirror region covering the light source and the first exit surface from the front side, and a luminous region covering the second exit surface from the front side. A diffusion member is placed in direct and close contact with a luminous region back surface, and the diffusion member diffuses light from the light guide plate toward the front side.