Light Guide With Printed Reflection Parts For Uniform Luminance
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Solution Overview
Problem
Conventional light guides suffer from non-uniform luminance, hot spots, and inefficient side luminous efficiency due to uncontrolled light sources and delamination issues with attached light diffusion plates, and side-emitting optical fibers fail to provide sufficient brightness with excessive heating.
Innovation Solution
A light guide with a transparent core bar featuring a light spreading ink composition printed on its surface, where the reflection parts are arranged in a specific pattern with decreasing spaces along the length, utilizing acryl-based copolymer resin, light spreading agents, and auxiliary agents to achieve uniform luminance and prevent hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light diffusion plate is attached to a core using conventional methods, then light diffusion is achieved, but the sheet frequently delaminates due to attachment property issues
Solution Approach 1:
The patent merges the light diffusion plate and core into a single integrated light guide component formed by co-extrusion. The light guide includes a core layer and a light diffusion layer that are extruded simultaneously as one piece, eliminating the separate attachment step and associated delamination problems while maintaining the light diffusion function.
Solution Approach 2:
The light guide component serves multiple functions simultaneously: the core layer guides light transmission while the light diffusion layer provides light diffusion. This multi-functional integration eliminates the need for separate components and attachment mechanisms, improving reliability while maintaining functionality.
2Productivity
If a light guide uses a conventional extrusion method with V-cut etching, then the core is formed, but side luminous efficiency remains unfavorable and additional space is required for a separate light diffusion plate
Solution Approach 1:
The light guide combines the core and light diffusion functions into a single co-extruded component. The light diffusion layer is integrated directly onto the core surface through simultaneous extrusion, eliminating the need for separate light diffusion plates and V-cut etching processes, thereby improving side luminous efficiency and reducing space requirements.
Solution Approach 2:
The light guide is segmented into functional layers (core layer and light diffusion layer) that are extruded simultaneously. This layered segmentation allows each layer to perform its specific function while being part of an integrated structure, improving side luminous efficiency without requiring additional space.
3Adaptability or versatility
If a light guide includes side light emitting optical fiber, then light is emitted in all directions (360 degrees), but sufficient brightness is not obtained and excessive heating regions occur at the leader
Solution Approach 1:
The light guide applies local quality by creating specific structural features at different locations. The core has an irregular cross-sectional shape with protrusions and recesses that concentrate light emission at specific zones, providing high brightness where needed while maintaining multi-directional emission capability through the overall geometry.
Solution Approach 2:
The light guide employs curved and irregular cross-sectional shapes instead of simple cylindrical forms. The protrusions and recesses create varied light emission paths and surfaces, enabling 360-degree light emission while concentrating brightness at specific regions and reducing excessive heating through distributed heat dissipation geometry.
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 provides high and uniform luminance across the light guide, maintaining brightness levels even at greater distances from the light source while minimizing luminance deviation and preventing hot spots, suitable for applications like vehicle and industrial lighting.
Implementation Method 1
a plurality of reflection parts printed in parallel along with the length direction of the core bar on the outer surface
Implementation Method 2
a light spreading ink composition printed using on the outer surface of a core bar
Data Source
AI summary
Disclosed is a light guide including a core bar of a transparent material extended in a length direction from a first side to a second; and a plurality of reflection parts printed in parallel along with the length direction of the core bar on the outer surface; wherein spaces between the reflection parts are the same or decreased from the first side of the core bar toward the second side of the core bar.