Aspheric Light Guide for Variable Automotive Output Spot Size
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Solution Overview
Problem
Existing automotive lighting devices face limitations in achieving a larger output spot size due to manufacturing and design constraints, particularly with flat light guides.
Innovation Solution
A light guide device with aspheric surfaces, including a first and second aspheric surface with a common focal point, and a collimator to control light rays, allowing for adaptable output spot size adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat light guide is used, then manufacturing is simplified, but the output spot size is limited
Solution Approach 1:
The patent applies curvature by replacing flat light guide surfaces with aspheric surfaces. The light guide includes at least one aspheric surface that enables variable output spot sizes while maintaining manufacturing feasibility. This curvature principle directly resolves the contradiction by allowing larger output spots without sacrificing manufacturing simplicity.
2Area of stationary object
If the light guide thickness is increased, then the output spot size can be larger, but manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the light guide by introducing aspheric surfaces with specific mathematical definitions (e.g., z = c*r^2 / (1 + sqrt(1 - (1+k)*c^2*r^2))). This allows variable output spot sizes to be achieved through parameter optimization rather than increasing overall thickness, thereby reducing structural complexity while maintaining the desired output area.
3Adaptability or versatility
If aspheric surfaces are introduced, then output spot size becomes adaptable, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses aspheric surfaces defined by well-established mathematical equations that can be precisely manufactured using modern molding or machining techniques. The specific aspheric profiles (parabolic, elliptical, or hyperbolic) provide predictable optical performance, allowing adaptability in output spot size while maintaining achievable manufacturing precision through standardized geometric definitions.
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
Enables variable output spot size while adhering to manufacturing requirements, enhancing flexibility and efficiency in automotive lighting applications.
Implementation Method 1
The two or more aspherical surfaces are configured to maintain total internal reflection in the light guide
Data Source
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AI summary
A device (100), a light guide (102), and a method for automotive lighting are provided. The device (100) includes a light source (104) and a light guide (102). The light source provides light rays. The light guide (102) includes two or more aspheric surfaces (112,114) having at least a common focal point (206). The two or more aspheric surfaces (112,114) are configured to maintain total internal reflection of the light rays in the light guide (102).