Light Guide Incident Face Geometry for Uniform Light Coupling
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Solution Overview
Problem
Conventional light guide devices have uniform light intensity distribution issues due to planar incident end surfaces, leading to inefficient light transmission and distribution.
Innovation Solution
The light guide device features a light incident end with multiple angled or twisted light incident faces, each with a first and second edge displaced along the axis, allowing for non-perpendicular light entry and improved light intensity distribution through total reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar incident end surface is used, then the device structure is simple and easy to manufacture, but the light intensity distribution is non-uniform and optical efficiency is poor
Solution Approach 1:
The incident end surface is segmented into multiple light incident faces (first, second, third, and fourth light incident faces) arranged around the optical axis. Each face is inclined at different angles relative to the optical axis, creating distinct light reception zones that collectively achieve uniform light intensity distribution across the light guide device cross-section.
Solution Approach 2:
The light incident faces are designed with asymmetric inclination angles relative to the optical axis. Specifically, the first and second light incident faces are inclined at a first angle, while the third and fourth light incident faces are inclined at a second angle different from the first angle. This asymmetric angular configuration optimizes light distribution uniformity while maintaining manufacturing feasibility through rotational symmetry.
2Ease of manufacture
If a planar incident end surface is used, then the manufacturing process is simple, but the optical efficiency and light transmission are insufficient
Solution Approach 1:
Different regions of the incident end are assigned different optical properties through the inclined light incident faces. Each face is optimized for specific light reception directions and angles, with the inclination angles carefully selected to maximize light coupling efficiency into the light guide device while maintaining overall manufacturing simplicity through the modular face structure.
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 enhances optical efficiency by achieving a more uniform light intensity distribution and improved light transmission compared to conventional devices with planar incident end surfaces.
Implementation Method 1
the light travels primarily by total reflection
Data Source
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AI summary
Embodiments of the present invention provide a light guide device, a lighting apparatus, and a motor vehicle. The light guide device includes: a light incident end configured to receive an incident light, wherein the light incident end has at least one light incident face and each light incident face has a first edge and a second edge that are displaced from each other in a direction along an axis of the light guide device. The light guide device can improve the uniformity and efficiency of incident light coupling of the light guide device.