Lighting device
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Solution Overview
Problem
Existing lighting devices fail to provide uniform illumination of the opening edge portion of a storage member, leading to bright and dark areas, due to light attenuation and increased luminance as distance increases from the incident portion.
Innovation Solution
A lighting device with a light guide member and a shielding wall that gradually reduces the distance between the inner and outer peripheral portions, increasing light leakage and preventing luminance decline, ensuring uniform illumination across the entire circumference through the formation of a concave portion and visible side face with emboss processing for enhanced reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guide member has a constant width between inner and outer peripheral portions, then the structure is simple, but the luminance on the light emission surface declines as distance from the incident portion increases
Solution Approach 1:
The light guide member features a gradually-reduced portion where the width between inner and outer peripheral portions varies along the light propagation direction. This creates different local optical paths - the gradually-reduced portion increases light leakage to compensate for attenuation, while other portions maintain uniform luminance, achieving non-uniform structure for uniform illumination effect
Solution Approach 2:
The patent changes the geometric parameter (width) of the light guide member along the light propagation direction. The gradually-reduced portion specifically reduces the width between inner and outer peripheral portions to increase the number of refractions and light leakage, compensating for light attenuation and achieving uniform luminance distribution
2Illumination intensity
If no shielding wall is provided, then the structure is simpler, but luminance increases as distance from the incident portion decreases creating non-uniform illumination
Solution Approach 1:
The shielding wall is extracted as a separate component that can be integrally formed in the storage member. It is positioned to shield specific regions and control light distribution, preventing excessive luminance near the incident portion while maintaining uniform illumination across the light emission surface
Solution Approach 2:
The shielding wall acts as an intermediary element between the light source and the light guide member. It mediates the light distribution by blocking direct light paths and controlling the illumination pattern, working together with the light guide member to achieve uniform luminance
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 achieves uniform illumination of the opening edge portion in any position, minimizing bright and dark areas with a simple structure, enhancing the design and functionality of storage devices like cup holders.
Implementation Method 1
the light propagated to the light guide member increases the number of refractions as reducing the width between the inner peripheral portion and the outer peripheral portion
Data Source
Figure 1
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AI summary
A lighting device includes a storage member provided with a receiving opening for an object to be stored, and a support bottom portion for supporting the received object to be stored; a light source; and a loop-shaped light guide member including an incident portion for a light from the light source and a light emission surface formed along an edge of the receiving opening. The incident portion is positioned on an outer peripheral portion side of the light guide member, and a shielding wall along the receiving opening is positioned between the outer peripheral portion and the inner peripheral portion. Also, the light guide member includes a gradually-reduced portion reducing a distance between the inner peripheral portion and the outer peripheral portion as leaving from the incident portion.