Dual Color Wheel Synchronization in Laser Light Sources
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Solution Overview
Problem
Existing laser light source systems with coaxial dual color wheels face challenges in precise synchronization, leading to color mixing and reduced brightness due to assembly errors and offset issues, which affect the purity and timing of primary color output.
Innovation Solution
A method and system for synchronizing non-coaxial dual color wheels using markers and sensors to generate sense signals, allowing a control unit to adjust rotation speeds and ensure precise alignment, even in non-coaxial designs, thereby preventing color mixing and improving brightness and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coaxial dual color wheels are used for wavelength conversion and color filtering, then the structure is compact and simple, but assembly errors and offset issues cause color mixing and reduce brightness
Solution Approach 1:
The patent introduces a color filter wheel as an intermediary component between the fluorescence wheel and the projection lens. This mediator allows for independent rotation and precise positioning of the color filtering function, separating it from the wavelength conversion function of the fluorescence wheel. The color filter wheel includes transparent regions that correspond to the fluorescent regions, enabling precise color output without requiring perfect coaxial alignment.
Solution Approach 2:
The patent divides the color wheel system into two separate functional segments: the fluorescence wheel for wavelength conversion and the color filter wheel for color selection. Each wheel can rotate independently and be controlled separately, allowing for precise synchronization and positioning. This segmentation enables the system to achieve high color alignment precision while maintaining structural compactness.
2Device complexity
If the fluorescence wheel and color filter wheel are synchronized using the same motor, then the control system is simple, but offset errors prevent precise color timing
Solution Approach 1:
The patent employs sensors to detect the positions of markers on both the fluorescence wheel and the color filter wheel, generating sense signals that are fed back to the control unit. The control unit synchronizes the rotation of both wheels based on these feedback signals, ensuring precise color timing. This feedback mechanism allows for real-time adjustment and maintains high positioning precision while keeping the control system relatively simple.
Solution Approach 2:
The patent makes the control system dynamic by allowing independent speed adjustment of the fluorescence wheel and color filter wheel. The control unit can dynamically synchronize the rotation speeds and positions of both wheels based on real-time sensor feedback, enabling precise color timing output even with different wheel diameters and rotational characteristics.
3Measurement precision
If markers and sensors are added to synchronize non-coaxial wheels, then color timing precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service synchronization mechanism where the system automatically detects and corrects its own positioning errors. Sensors detect markers on both wheels and generate sense signals that the control unit uses to automatically synchronize the wheels without requiring manual intervention. This self-service approach maintains high color timing precision while minimizing the need for complex external control systems.
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 enables precise synchronization of non-coaxial dual color wheels, ensuring accurate timing and output of primary colors, enhancing the brightness and purity of monochromatic light, and improving hue saturation in laser projection systems.
Implementation Method 1
blue laser is emitted onto the fluorescence wheel to excite green fluorescent powder and yellow fluorescent powder so as to generate green light and yellow light respectively
Implementation Method 2
the green light and the yellow light passes a green light filter sheet and a red light filter sheet of a color filter wheel, thus resulting in green and red light
Data Source
AI summary
A laser light source is provided. The laser light source includes: a laser device; a first color wheel and a second color wheel, on both of which there are corresponding color regions, wherein the laser device emits laser which illuminates the first color wheel and the second color wheel sequentially, and exits from the color regions on the second color wheel; a first marker and a second marker arranged respectively on the first and the second color wheels; a first sensor configured to detect the first marker, and to generate a first sense signal; a second sensor configured to detect the second marker, and to generate a second sense signal; and a control unit configured to synchronize the first color wheel and the second color wheel.