Stepped Light Guide Structure for Uniform Vehicle Lamp Emission
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Solution Overview
Problem
Existing vehicle lamps using light emitting diodes (LEDs) face challenges in increasing the light emitting area due to their small emission angle, limiting design freedom and requiring improved light distribution and uniformity.
Innovation Solution
A lighting device with a light guide member featuring a substrate, light source, and reflective surfaces of varying heights and angles, including a first reflective surface with inclined portions and a second reflective surface, to enhance light guidance and distribution, forming a dot matrix pattern.
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 emission angle is small which limits the light emitting area
Solution Approach 1:
The patent transitions from a conventional planar light emitting structure to a three-dimensional light guide member with stepped reflective surfaces. By introducing vertical height variations and multiple reflection levels, the light emitting area is expanded in the vertical dimension while maintaining the LED's inherent low power consumption characteristics.
Solution Approach 2:
The light guide member is divided into multiple reflective portions at different heights, creating segmented reflection zones. This segmentation allows light to be reflected multiple times at different angles and levels, effectively increasing the light emitting area without requiring additional high-power light sources.
2Ease of manufacture
If the light guide member has a simple flat structure, then manufacturing is easy, but light uniformity and distribution are poor
Solution Approach 1:
The light guide member employs a dynamic stepped structure where the reflective surfaces are arranged at different heights and angles. This dynamic configuration allows light to undergo multiple reflections at varying angles, creating uniform light distribution across the exit surface while maintaining a relatively simple monolithic manufacturing process.
3Area of stationary object
If the emission angle of LED is increased, then the light emitting area increases, but the emission angle of LED is inherently small
Solution Approach 1:
The light guide member acts as an intermediary between the LED light source and the external environment. It receives light from the LED with its inherent small emission angle and, through multiple reflections off the stepped surfaces, redistributes the light to achieve a larger effective emitting area and improved angular distribution without modifying the LED itself.
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 device provides improved light uniformity and various light distribution images, enhancing optical reliability and design flexibility for vehicle lamps.
Implementation Method 1
a light guide member disposed on the substrate and the light source, wherein the light guide member comprises an exit surface and a first reflective surface facing the exit surface
Data Source
AI summary
A lighting device disclosed in an embodiment of the invention comprises a substrate; a light source disposed on the substrate; and a light guide member disposed on the substrate and the light source, wherein the light guide member includes an exit surface and a first reflective surface facing the exit surface, the first reflective surface includes a plurality of reflective portions having different heights with respect to an upper surface of the substrate, and each of the plurality of reflective portions may include a plurality of first surfaces inclined with respect to the upper surface of the substrate.