Freeform Surface Lens Illumination System Adaptability
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Solution Overview
Problem
Conventional illumination systems with freeform surfaces are designed for a single immovable light source and suffer a decrease in illumination effect when the light source is moved or multiple light sources are introduced, limiting their adaptability and performance.
Innovation Solution
A method for designing an illumination system with freeform surface that involves multiple collimated light sources, a sphere lens, and a target plane, where the system iteratively adjusts to form expected light spots through a series of constructions-iterations, allowing for continuous movement and adjustment of light sources while maintaining consistent light spot parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single immovable light source is used in the illumination system with freeform surface, then the illumination effect is optimized for that specific configuration, but the system loses adaptability when the light source is moved or multiple light sources are introduced
Solution Approach 1:
The freeform surface is designed to work with multiple light sources of different types (point source, line source, area source) and configurations (single or multiple, movable or fixed) by establishing generalized mapping relationships between light sources and target planes, making the illumination system universally applicable rather than specific to one light source configuration
Solution Approach 2:
The system allows dynamic adjustment of light source positions and configurations while maintaining optimal illumination performance through iterative design methods that can accommodate different light source arrangements, enabling the system to adapt to changing requirements rather than being fixed to a single configuration
2Manufacturing precision
If the freeform surface is designed for a specific light source configuration, then the light path control is precise for that configuration, but the system performance decreases when the configuration changes
Solution Approach 1:
The design process is segmented into iterative steps where the freeform surface is developed through multiple construction-iteration cycles, each refining the light path control for different light source configurations. This allows the system to maintain precision across various configurations by building up the solution incrementally rather than attempting to optimize for all cases simultaneously
Solution Approach 2:
The system changes key parameters during the iterative design process, including light source position, type, and configuration parameters, to achieve optimal light path control for different scenarios. By systematically varying these parameters through iterations, the freeform surface design achieves both precision and reliability across multiple configurations
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 method achieves stable and improved illumination effects by reducing the average RMS deviation of light spot formation, ensuring consistent light distribution and adaptability across various light source configurations, thereby enhancing the overall performance of the illumination system.
Implementation Method 1
a freeform surface has larger degrees of freedom, which can accurately control light path
Data Source
AI summary
An illumination system with freeform surface comprises a plurality of collimated light sources having same parameters and a freeform surface lens comprising a first freeform surface and a second freeform surface, wherein formula of the first freeform surface and the second freeform surface is expressed as follows:z=c(x2+y2)1+1-(1+k)c2(x2+y2)+∑m∑nAmnxmyn,in which c is the curvature of the conic surface at the vertex, k is the conic constant, Amn represents the xy polynomials coefficient, m+n≥2 and both m and n are even, beams emitted by the plurality of collimated light sources pass through the freeform surface lens to form a plurality of light spots on a target plane.