Wavelength Conversion Module Sensor Placement for Thermal Management
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Solution Overview
Problem
In projection devices using solid-state light sources, the high temperature of the light positioning device due to its proximity to the wavelength conversion wheel causes signal degradation, affecting the synchronous control of the wavelength conversion wheel and light valve, leading to poor image quality.
Innovation Solution
A wavelength conversion module with a rotating member and a light sensing element, where the positioning structure cuts into the transmission path of the sensing beam, reducing the temperature of the light sensing element and providing a gas cutting effect, and the light sensing element is disposed adjacent to the edge of the rotating member to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light positioning device is disposed close to the substrate and motor of the wavelength conversion wheel, then the distance between the light positioning device and the reflecting surface is reduced (less than 5 mm), but the temperature of the light positioning device increases due to high rotating speed and light conversion energy
Solution Approach 1:
The patent extracts the light positioning device from the high-temperature environment near the wavelength conversion wheel by positioning it on the outer periphery of the rotating member. This separation removes the device from the harmful thermal field while maintaining its functional proximity to the rotation axis for accurate timing mark detection.
Solution Approach 2:
The patent transitions from a radial positioning approach (close to the axis) to a tangential positioning approach (on the outer periphery). By changing the spatial dimension of placement, the device achieves both close proximity to the rotation axis for accurate detection and distance from the heat source for thermal management.
2Reliability
If the light positioning device operates at high temperature, then the synchronous control can be maintained, but the signal quality deteriorates
Solution Approach 1:
The patent removes the light positioning device from the high-temperature zone generated by the wavelength conversion wheel, placing it on the outer periphery where temperatures are significantly lower. This extraction eliminates thermal interference with the sensor while preserving the ability to detect timing marks accurately for synchronous control.
3Productivity
If the rotating speed of the wavelength conversion wheel is increased, then the productivity is improved, but the temperature of the motor coil and substrate increases
Solution Approach 1:
The patent positions the light positioning device on the outer periphery of the rotating member, extracting it from the thermal field generated by high-speed rotation and wavelength conversion. This allows the system to operate at high speeds without compromising sensor performance due to temperature-induced signal degradation.
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 temperature of the light sensing element, prevents signal degradation, and improves the reliability and image quality of the projection device by maintaining the synchronous control of the wavelength conversion wheel and light valve.
Implementation Method 1
the light positioning device uses the light sensor to detect the presence or absence of a light signal returned by reflection through the wavelength conversion wheel
Implementation Method 2
the sensing beam forms a second spot on the rotating member
Data Source
AI summary
A wavelength conversion module and a projection device are provided. The wavelength conversion module includes a rotating member and a light sensing element. The rotating member includes a shaft and a positioning structure. An excitation beam forms a first spot on the rotating member. The shaft is located at the center of the rotating member. The positioning structure is located on the rotating member. The light sensing element is disposed adjacent to the rotating member for emitting a sensing beam toward a first surface of the rotating member, wherein the sensing beam forms a second spot on the rotating member. A first connecting line is formed by connecting the first spot and the shaft, a second connecting line is formed by connecting the second spot and the shaft, and an angle between the first connecting line and the second connecting line is greater than 30 degrees.