Fluorescent Wheel Control for Projector Startup Delay
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Solution Overview
Problem
Fluorescent light emitting devices in projectors face delays in starting up due to the need to rotate the fluorescent wheel to dissipate heat, especially when the wheel motor lacks a rotation sensor, leading to time-consuming adjustments and increased power consumption.
Innovation Solution
A light source device with a control unit that continues rotating the fluorescent wheel for a predetermined period after shutdown, allowing immediate power-on without needing to adjust the wheel's position, thus reducing startup time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fluorescent wheel is rotated by the wheel motor to dissipate heat, then the fluorescent wheel is protected from heat damage, but it takes time to adjust the rotational position and the startup time increases
Solution Approach 1:
The control unit continues rotating the fluorescent wheel for a predetermined period after the light source unit is turned off, so that when the device is restarted, the wheel is already in a safe rotational position and can immediately receive excitation light without requiring adjustment time. This preliminary action eliminates the startup delay while maintaining heat dissipation protection.
2Measurement precision
If the wheel motor is equipped with a rotation sensor to grasp rotational position, then the control precision is improved, but the device complexity and cost increase
Solution Approach 1:
The fluorescent wheel itself serves as the position reference by continuing to rotate after shutdown. The control unit utilizes the wheel's own rotational motion and predetermined rotation period to ensure it returns to a safe position, eliminating the need for external rotation sensors or complex position detection systems.
3Temperature
If the fluorescent wheel is rotated at high speed to ensure sufficient heat dissipation, then the heat dissipation effectiveness is improved, but the power consumption and noise increase
Solution Approach 1:
The fluorescent wheel rotates at high speed during operation for effective heat dissipation, then continues rotating at the same speed for a predetermined period after shutdown to ensure it reaches a safe position. This periodic high-speed rotation ensures both heat dissipation effectiveness and proper positioning without requiring continuous high-speed rotation, thereby reducing overall power consumption and noise during extended periods.
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
This configuration reduces the time to emit light after startup, minimizes damage to the fluorescent wheel from heat, and decreases power consumption and noise by maintaining a lower rotation speed during the initial power-up phase.
Implementation Method 1
a fluorescent wheel (first optical element) on which light emitted from the light source unit is incident
Implementation Method 2
a wheel motor (first drive unit) for rotationally driving the fluorescent wheel
Data Source
AI summary
An embodiment of a light source device according to the invention includes: a light source unit configured to emit light; a first optical element on which the light emitted from the light source unit is incident; a first drive unit configured to rotate the first optical element; and a control unit configured to control the light source unit and the first drive unit. The control unit is configured to continue rotating the first optical element during a first period until a first predetermined time passes after the light source unit is turned off.