Bridging Light Guide Section for Uniform Vehicle Lamp Illumination
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Solution Overview
Problem
Current light guide assemblies in vehicle lamps often result in nonuniform illumination effects, particularly at branching points, leading to unacceptable dark regions due to disruptions in total reflection conditions.
Innovation Solution
The optical assembly features a light guide with a bridging section between two bifurcating sections, spaced at least 10 mm apart, with a trapezoidal cross-section and light decoupling structures to ensure uniform light propagation and emission, using a transparent material like polycarbonate for manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a light guide assembly is split into at least two branches to achieve a desired shape, then the shape requirement is satisfied, but nonuniform illumination effects and dark regions occur at the branching position
Solution Approach 1:
A bridging light guide section is introduced as an intermediary component between the first and second light guide sections. This bridging section receives light from the first light guide section and redirects it to the second light guide section, ensuring uniform light distribution at the branching position and eliminating dark regions while maintaining the desired shape.
Solution Approach 2:
The bridging light guide section is positioned at a specific location (at least 10 mm away from the bifurcation position) and configured with specific dimensions to provide localized light redistribution. This local intervention ensures uniform illumination at the critical branching region without affecting the overall shape design of the light guide assembly.
2Device complexity
If light guide sections are connected directly at the bifurcation position, then the structure is simple, but light distribution becomes nonuniform with dark regions appearing
Solution Approach 1:
The bridging light guide section serves as a mediator between the first and second light guide sections, positioned at a distance of at least 10 mm from the bifurcation position. This intermediary structure enables uniform light distribution by redirecting light from the first section to the second section, preventing dark regions while adding minimal structural complexity.
3Length of stationary object
If the bridging light guide section is positioned close to the bifurcation position, then the assembly is compact, but uniform light output cannot be achieved
Solution Approach 1:
The bridging light guide section is positioned at a specific distance (at least 10 mm) from the bifurcation position, creating a localized light redistribution zone. This positioning allows the bridging section to effectively homogenize light output by receiving light from the first light guide section and redirecting it to the second section, achieving uniform illumination while maintaining reasonable assembly compactness.
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
This design achieves a uniform light output effect along the entire length of the assembly, ensuring consistent illumination by controlling light intensity and direction through the bridging section's geometry and decoupling structures.
Implementation Method 1
to disrupt the conditions for total reflection of light in the light guide assembly
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention relates to an optical assembly, a vehicle lamp and a motor vehicle; specifically, the optical assembly (1) comprises a light guide (10), the light guide (10) at least having a first light guide section (2), a second light guide section (3) and a bridging light guide section (5), the first light guide section (2) and the second light guide section (3) being connected together at one end to form an end region (S) and bifurcating from the end region, the end region having an end face for the in-coupling of light, and the bridging light guide section (5) being arranged between the first light guide section (2) and the second light guide section (3), wherein the bridging light guide section (5) is spaced apart from a bifurcation position of the first light guide section (2) and the second light guide section (3), and the bridging light guide section (5) has a light in-coupling face (51) facing the bifurcation position, and a light out-coupling face (52).