Projector Color Wheel Anti-Dust Curved Surface Structure
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Solution Overview
Problem
Conventional projectors using color wheels face issues with dust deposition on optical sensors due to inadequate airflow management, leading to reduced efficiency and potential sensor failure.
Innovation Solution
The projector incorporates an anti-dust structure with a curved surface and a guiding slot within the color wheel module, creating a narrow passage that deflects airflow away from the optical sensor, thereby reducing dust deposition. This structure includes a first section with a larger distance between the rotary surface and the curved surface, and a second section with a smaller distance, providing varying airflow resistance to direct airflow towards the guiding slot, further minimizing dust accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blocking structure is disposed close to the rotation shaft to reduce airflow toward the optical sensor, then dust deposition on the optical sensor is reduced, but the rotation stability of the rotation shaft deteriorates due to abrasion and mechanical movement constraints
Solution Approach 1:
The patent introduces a curved surface that extends in the rotation direction, creating a three-dimensional narrow passage between the curved surface and the rotary surface. This spatial configuration redirects airflow along the curved path, effectively blocking dust-laden airflow from reaching the optical sensor while maintaining adequate clearance for rotation shaft stability.
Solution Approach 2:
The curved surface is designed with varying distances from the rotary surface - a first section with a larger distance and a second section with a smaller distance. This local variation in geometry creates different airflow resistance at different positions, effectively constraining and deflecting airflow away from the optical sensor while preserving rotation stability in critical areas.
2Stability of the object's composition
If the blocking structure is disposed further from the rotation shaft to maintain rotation stability, then rotation stability is maintained, but dust deposition on the optical sensor increases due to increased airflow
Solution Approach 1:
By extending the curved surface in the rotation direction and creating a narrow passage, the patent utilizes the third dimension to redirect airflow. This allows the blocking structure to maintain adequate distance from the rotation shaft for stability while still effectively intercepting and redirecting airflow away from the optical sensor.
Solution Approach 2:
The curved surface with its specific curvature profile creates a gradual airflow deflection. The curvature allows airflow to be smoothly redirected along the rotation direction rather than creating abrupt obstructions, maintaining rotation stability while effectively blocking dust-laden airflow from reaching the sensor.
3Object-affected harmful factors
If a narrow passage is created between the curved surface and rotary surface to deflect airflow, then dust deposition on the optical sensor is reduced, but airflow resistance increases
Solution Approach 1:
The curved surface is designed with non-uniform spacing from the rotary surface, with a first section having a larger distance and a second section having a smaller distance. This local variation optimizes the balance between airflow deflection effectiveness and airflow resistance, creating sufficient narrowing to block dust while maintaining adequate passage for air flow.
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 anti-dust structure effectively reduces dust deposition on the optical sensor by constraining airflow and guiding it away from the sensor, enhancing the projector's reliability and performance by maintaining sensor cleanliness.
Implementation Method 1
An airflow induced by the rotary surface due to the rotation of the rotary part is subjected to a constraint by the narrow passage
Data Source
AI summary
A projector includes a color wheel module and an optical engine. The color wheel module includes a rotation device, a mount, a color wheel, and an optical sensor. The color wheel is fixed on a rotary part of the rotation device. The rotation device and the optical sensor are fixed on the mount. The mount has an anti-dust structure includes a curved surface that is opposite to a rotary surface of the rotary part and extends in a rotation direction of the rotary part. The curved surface and the optical sensor are arranged sequentially in the rotation direction. Either by shortening a distance between the curved surface and the rotary surface or by a guiding slot that is disposed beside or lower than the curved surface, dust deposited on the optical sensor can be reduced effectively.