Light Deflecting Device Cover Opening Angle for Noise Reduction
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Solution Overview
Problem
Conventional light deflecting devices with non-sealed type covers suffer from noise leakage due to the rotation of the rotary polyhedron, which is not effectively mitigated by simply minimizing the opening size.
Innovation Solution
The light deflecting device incorporates a cover with an opening angle that satisfies specific equations relative to the number of surfaces of the rotary polyhedron, optimizing airflow to cancel out noise by maintaining equal gap lengths and phase-shifted pressure variations, thereby reducing noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the opening size is minimized to reduce noise leakage, then noise reduction is improved, but the optical performance and light beam transmission are compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the opening angle θ of the cover opening relative to the rotary polyhedron's geometry. The opening angle is set to satisfy specific mathematical relationships with the number of surfaces and rotation angle, transforming the opening from a simple geometric feature into a noise-controlling parameter that maintains both optical performance and noise reduction
2Reliability
If the opening angle is increased to improve light beam transmission, then optical performance is improved, but noise leakage increases
Solution Approach 1:
The patent converts the harmful noise-generating airflow into a beneficial controlled flow pattern. By designing the opening angle to create specific pressure distributions and airflow paths, the natural air movement caused by rotary polyhedron rotation is transformed into a controlled flow that reduces noise while maintaining optical performance
3Ease of operation
If the cover is made non-sealed to facilitate maintenance and operation, then ease of operation is improved, but noise leakage worsens
Solution Approach 1:
The patent applies local quality by creating a non-uniform opening design where the opening angle θ is specifically optimized at different angular positions around the rotary polyhedron. The cover transitions from a uniform structure to one with spatially varying opening characteristics, allowing noise reduction in critical areas while maintaining overall accessibility
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 effectively reduces noise leakage while maintaining optimal airflow, ensuring efficient light deflection and scanning without compromising optical performance.
Implementation Method 1
The light deflecting device includes a rotary polyhedron and a cover that covers the rotary polyhedron. Light beam emitted from a light source is irradiated to the peripheral surface of the rotary polyhedron through the opening of the cover. The rotary polyhedron allows the light beam to be deflected and scanned with respect to an object to be irradiated through the opening while rotating about an axial center thereof.
Implementation Method 2
when an opening angle of the opening centered on the axial center of the rotary polyhedron is θ and n is set as a natural number smaller than a number of surfaces of the rotary polyhedron, θ satisfies Equation (1) θ>((360°/the number of surfaces of the rotary polyhedron)×n)×0.83 . . . (1) and Equation (2) θ
Data Source
AI summary
A light deflecting device includes a rotary polyhedron and a cover that covers the rotary polyhedron. The cover includes an opening facing a peripheral surface of the rotary polyhedron. Light beam is irradiated to the peripheral surface of the rotary polyhedron through the opening of the cover, and the rotary polyhedron allows the light beam to be deflected and scanned with respect to an object to be irradiated while rotating about an axial center thereof. When an opening angle of the opening centered on the axial center of the rotary polyhedron is θ and n is set as a natural number, θ satisfies the following Equation (1) θ>((360°/the number of surfaces of the rotary polyhedron)×n)×0.83 . . . (1) and Equation (2) θ<((360°/the number of surfaces of the rotary polyhedron)×n)×1.17 . . . (2).