Bi-directional Excitation Color Wheel for Simplified Light Source
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Solution Overview
Problem
Current light source systems require a double color wheel structure to achieve efficient red light output, resulting in a complex and costly setup, while single color wheels cannot produce high-efficiency three primary colors.
Innovation Solution
A bi-directional excitation color wheel with concentric rings and a dichroic filter group that includes reflecting mirrors and filters to generate blue, green, and red lights, allowing for a simplified dual-color-wheel structure to produce three primary colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a double color wheel structure is adopted to obtain efficient red light, then the red light efficiency is improved, but the structure becomes complicated and cost increases
Solution Approach 1:
The patent combines the functions of two separate color wheels (fluorescent wheel and filter wheel) into a single integrated color wheel structure. This single color wheel contains both fluorescent regions for light generation and filter regions for wavelength selection, merging what were previously separate components into one unified device, thereby reducing structural complexity while maintaining red light efficiency
Solution Approach 2:
The single color wheel is designed to perform multiple functions simultaneously: it acts as both a fluorescent light source (generating light through phosphor excitation) and a spectral filter (selecting specific wavelengths). This multi-functional design eliminates the need for separate wheels, reducing the overall system complexity while achieving the desired red light output
2Device complexity
If a single color wheel is used to simplify structure, then the structure complexity is reduced, but high-efficiency three primary color output cannot be implemented
Solution Approach 1:
The single color wheel is divided into multiple functional regions including different fluorescent regions (with various phosphors for different color emissions) and filter regions. This segmentation allows each region to specialize in generating or filtering specific wavelengths, enabling efficient three-primary-color output while maintaining a compact single-wheel structure
Solution Approach 2:
Different regions of the color wheel are assigned different properties: some regions contain fluorescent phosphors optimized for specific color emissions, while other regions contain filters for wavelength selection. This local differentiation of properties enables the single wheel to achieve the spectral characteristics of multiple separate wheels
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 bi-directional excitation color wheel simplifies the light source system structure while achieving high-efficiency output of three primary colors, reducing complexity and cost.
Implementation Method 1
a blue solid-state light-emitting element cooperating with a fluorescent color wheel
Implementation Method 2
the dichroic filter group includes a first dichroic filter, a second dichroic filter, a third dichroic filter and a fourth dichroic filter
Data Source
AI summary
A bi-directional excitation color wheel includes a first working surface and a second working surface which are of the same size, wherein the first working surface includes a first working ring and a second working ring which are concentric rings; the second working surface includes a third working ring and a fourth working ring which are concentric rings; the first working ring includes a first translucent region and a green fluorescent region, the second working ring includes a second translucent region, the third working ring includes a third translucent region, and the fourth working ring includes a fourth translucent region and a first fluorescent region; the first translucent region and the third translucent region are the same translucent region, and the second translucent region and the fourth translucent region are the same translucent region.