Vehicle Lighting Device With Line-Shaped Guidance for Uniform DRLs
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Solution Overview
Problem
Existing lighting devices using light emitting diodes (LEDs) for vehicles face challenges in expanding the light emission area and achieving uniform light distribution, particularly for daytime running lights, due to the limited emission angle and design constraints.
Innovation Solution
A lighting device comprising a substrate with elongated light sources, a light guide portion, a diffusion layer, and an optical lens with specific geometric configurations, including reflective members, to enhance light distribution and provide flexible, uniform line-shaped lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting diodes are used as vehicle lamps, then power consumption is reduced, but the light emitting area is limited due to small emission angle
Solution Approach 1:
The patent transitions from point-source LED emission to line-shaped light emission by arranging multiple LEDs along a linear substrate. This dimensional change from 0D point source to 1D line source expands the effective light emitting area while maintaining the energy efficiency of individual LEDs. The light guide portion extends the light emission along the length direction, creating a line-shaped illumination pattern that covers a larger area.
Solution Approach 2:
The lighting device divides the light emission function into multiple segments by arranging multiple light sources along the substrate. Each LED acts as an independent segment that contributes to the overall line-shaped light distribution. This segmentation allows the system to achieve large area coverage while maintaining the low power consumption characteristics of individual LED segments.
2Illumination intensity
If multiple light sources are arranged to increase light emitting area, then light distribution uniformity improves, but device complexity increases
Solution Approach 1:
The patent combines multiple light sources, light guide portions, and reflective members into an integrated lighting module. The substrate serves as a common platform that electrically connects and spatially arranges multiple LEDs. The light guide portion and reflective members are merged into a unified optical system that works together to achieve uniform line-shaped light distribution, reducing the complexity that would arise from separate assembly of these components.
Solution Approach 2:
The substrate performs multiple functions: it provides mechanical support for arranging light sources, serves as an electrical connection network, and defines the overall geometric configuration. The light guide portion simultaneously guides light from multiple sources and shapes the line-shaped emission pattern. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while maintaining uniform light distribution.
3Illumination intensity
If light guide portion and optical lens are configured with specific geometric relationships, then light distribution uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The lighting module is pre-configured with the light guide portion and reflective members arranged in specific geometric relationships before final assembly with the optical lens. The substrate provides a predetermined arrangement that ensures proper spacing and alignment. This preliminary configuration reduces the precision requirements during final assembly, as the critical geometric relationships are already established in the modular unit.
Solution Approach 2:
The patent employs different geometric configurations for different portions of the optical system. The light guide portion has specific width and length ratios optimized for line-shaped emission, while the optical lens has incident and exit surfaces with specific geometric relationships. Each component is locally optimized for its specific function, allowing the overall system to achieve uniform light distribution without requiring ultra-precise manufacturing across all 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 solution improves luminous intensity and uniformity of light distribution, enabling various light images and enhancing optical reliability for vehicle lamps, including daytime running lights.
Implementation Method 1
the exit surface of the optical lens may refract light incident on the incident surface into parallel light
Implementation Method 2
a reflective member having an insertion hole in which the light guide portion is disposed, a reflective portion extending to both sides of the insertion hole
Implementation Method 3
a diffusion layer for diffusing light is included on the light guide portion
Data Source
AI summary
A lighting device disclosed in an embodiment of the invention comprises a substrate; a plurality of light sources arranged in a second direction on the substrate; a lighting module having a light guide portion disposed on the substrate and the light sources; an optical lens disposed on the lighting module, the optical lens having an incident surface having a width greater than a width of the lighting module in a first direction, and an exit surface from which light incident on the incident surface is emitted; and a reflecting member having an insertion hole in which the light guide portion is disposed, a reflective portion extending to both sides of the insertion hole and covering both sides of the light guide portion, and a supporting portion supporting a lower edge of the optical lens, wherein the light guide portion and the insertion hole have a width in the first direction smaller than a length in the second direction, and an upper end of the reflective portion may be positioned higher than an upper end of the light guide portion.