Color Wheel Rotation Speed Detection via Optical Segments
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Solution Overview
Problem
Conventional color wheel rotation speed detection methods are complex and prone to errors due to the use of marks, which can shift or fall off, and are susceptible to high temperatures that can damage the rotation speed detector.
Innovation Solution
A color wheel rotation speed detecting module that uses a light signal to detect the rotation speed of the color wheel, eliminating the need for marks and incorporating a heat-insulated design to prevent detector burnout, comprising a color wheel, motor, and a processor with an emitter and receiver to calculate the rotation speed based on light signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mark is added to the color wheel for rotation speed detection, then the rotation speed can be detected, but the structure becomes complicated and the mark may drop or shift causing detection failure
Solution Approach 1:
The patent extracts the detection function from the external mark and integrates it directly into the color wheel segments. The color wheel segments themselves serve as the detection markers, eliminating the need for separate mark structures. This reduces structural complexity while maintaining detection accuracy.
Solution Approach 2:
The color wheel segments serve dual functions: they perform wavelength conversion for image projection and simultaneously serve as detection markers for rotation speed measurement. This multi-functionality eliminates the need for separate detection marks, simplifying the overall structure.
2Measurement precision
If the rotation speed detector is disposed adjacent to the motor and color wheel for detection, then the rotation speed can be measured, but the detector is easily burned due to high temperature
Solution Approach 1:
The patent introduces a light signal as an intermediary medium for detection. Instead of placing the detector directly near the heat source, the detection is performed optically through light signals that interact with the color wheel segments, allowing remote detection without thermal damage.
Solution Approach 2:
The patent replaces the conventional mechanical/proximity-based detection system with an optical detection system. The emitter and receiver use light signals to detect rotation speed without physical contact or proximity to the high-temperature motor and color wheel, eliminating thermal damage risks.
3Productivity
If the color wheel is used for wavelength conversion with motor operation, then multicolor images can be projected, but high temperature is generated that damages the rotation speed detector
Solution Approach 1:
The light signal acts as an intermediary that allows the rotation speed detection to occur without direct exposure to the high-temperature environment created by motor operation and wavelength conversion. The optical detection path remains separate from the thermal environment.
Solution Approach 2:
The patent replaces thermal/mechanical detection methods with optical detection. This substitution allows the system to maintain high productivity through continuous motor operation and wavelength conversion while the optical detector remains unaffected by the generated heat.
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
Simplifies the detection process by eliminating mark-related errors and prevents detector damage from high temperatures, allowing for accurate and reliable rotation speed measurement.
Implementation Method 1
When the receiver receives the light signal reflected from the at least one second segment, the receiver outputs a detecting signal correspondingly
Implementation Method 2
when the light signal passes through the first segment and the receiver fails to receive the light signal
Data Source
AI summary
A color wheel rotation speed detecting module is disclosed and includes a color wheel, a motor, a rotation speed detector and a processor. The color wheel includes a first segment and at least one second segment. The motor drives the color wheel to rotate. The rotation speed detector includes an emitter and a receiver. The emitter outputs a light signal to the first segment or the second segment of the color wheel when the color wheel is rotated. When the receiver receives the light signal reflected from the second segment, the receiver outputs a detecting signal correspondingly. When the light signal passes through the first segment and the receiver fails to receive the light signal, the receiver interrupts the output of the detecting signal. The processor receives the detecting signal from the receiver, and obtains the rotating speed of the color wheel according to the detecting signal varied with time.