Phosphor Wheel Flicker Control via Dynamic Excitation Intensity
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Solution Overview
Problem
Light source devices with phosphor wheels experience flicker due to variations in fluorescence intensity as the phosphor wheel rotates, and increasing rotation speed or manufacturing precision to mitigate this can lead to increased costs or reduced motor service life.
Innovation Solution
A light source device with an excitation light source, a phosphor wheel that emits fluorescence, a detection unit to monitor rotation, and a control unit that adjusts the intensity of the excitation light based on the detected rotation and fluorescence characteristics to minimize flicker without shortening the motor's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rotation speed of the phosphor wheel is increased to reduce flicker, then the flicker is reduced, but the service life of the motor is shortened
Solution Approach 1:
The invention applies dynamics by making the excitation light intensity adjustable and variable over time. The control unit dynamically changes the intensity of excitation light based on the detected fluorescence characteristic variation, allowing the system to adapt to the phosphor wheel's rotation and compensate for intensity variations without requiring constant high-speed rotation.
Solution Approach 2:
The invention changes the parameter of excitation light intensity to compensate for fluorescence characteristic variations. By detecting the variation in fluorescence intensity and相应地 adjusting the excitation light intensity, the system maintains uniform output light intensity without needing to increase rotation speed, thus preserving motor service life.
2Object-affected harmful factors
If manufacturing precision of phosphor wheels is improved to reduce flicker, then flicker is reduced, but manufacturing cost increases
Solution Approach 1:
The system performs self-correction by detecting its own fluorescence characteristic variations and automatically adjusting the excitation light intensity accordingly. This self-service mechanism eliminates the need for high-precision manufacturing, as the system compensates for manufacturing variations through active control.
Solution Approach 2:
The invention implements feedback control by detecting the fluorescence characteristic variation and using this information to adjust the excitation light intensity. This closed-loop feedback system allows the use of phosphor wheels with varying manufacturing precision while maintaining consistent output, thereby reducing manufacturing costs.
3Object-affected harmful factors
If phosphor wheel rotation speed is increased to reduce flicker, then flicker is reduced, but the cyclical change in fluorescence intensity becomes faster
Solution Approach 1:
The invention uses periodic action by adjusting the excitation light intensity in synchronization with the phosphor wheel rotation period. The control unit detects the rotation and applies periodic intensity modulation to the excitation light, compensating for the cyclical fluorescence variations and eliminating flicker without needing to increase rotation speed.
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 effectively reduces flicker occurrence by dynamically adjusting the excitation light intensity in synchronization with the phosphor wheel's rotation, addressing intensity variations without compromising motor longevity.
Implementation Method 1
The phosphor wheel emits fluorescence in response to excitation light that is irradiated from the excitation light source
Data Source
AI summary
A light source device includes: an excitation light source unit that emits excitation light; a phosphor wheel unit that includes a wheel that produces fluorescence by the excitation light and that, by causing the wheel to rotate, changes the position on the wheel that is irradiated by the excitation light; a detection unit that detects rotation of the wheel; and a control unit that changes intensity of the excitation light on the basis of the detection result of the detection unit and the fluorescence characteristic of the wheel.