Light Deflector Spring Segmentation for Resonance Stability
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Solution Overview
Problem
The fluctuations in resonance frequency of light deflectors due to changes in the size of the opening portion in the supporting unit caused by temperature changes during packaging and mounting, leading to distortion of the movable part and instability in the oscillations of the reflector.
Innovation Solution
The design incorporates a configuration where the supporting units are separated by opening portions, with springs that deform earlier than the movable parts, preventing distortion and maintaining consistent resonance frequency, and the springs are thicker and more rigid than the movable parts to prevent bending and fluctuations in oscillation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an opening portion is provided in the supporting unit to increase driving force and deflection angle, then the driving force and deflection angle are improved, but the resonance frequency fluctuates due to temperature changes during packaging and mounting
Solution Approach 1:
The supporting unit is divided into multiple separate supporting parts with gaps between them, allowing thermal expansion and contraction without distorting the movable part. This segmentation prevents the supporting unit from becoming a single rigid structure that would constrain thermal movement and cause resonance frequency fluctuations.
Solution Approach 2:
The patent introduces a compliant structure with localized flexibility at specific positions where thermal expansion occurs. This allows different parts of the supporting unit to have different mechanical properties - rigid where support is needed, flexible where thermal movement occurs - thereby maintaining resonance frequency stability while preserving driving force.
2Illumination intensity
If the opening portion size changes due to temperature changes, then the movable part becomes distorted, but the opening portion is necessary for light transmission
Solution Approach 1:
The patent incorporates a compliant structure that anticipates and cushions against thermal expansion and contraction before they can cause distortion to the movable part. This pre-compliance mechanism absorbs dimensional changes during packaging and mounting, protecting the movable part's shape stability while maintaining the opening for light transmission.
3Strength
If the supporting unit is made rigid to maintain structural stability, then structural stability is improved, but the resonance frequency fluctuates due to thermal expansion
Solution Approach 1:
The supporting unit is segmented into multiple rigid supporting parts separated by gaps, allowing each part to maintain its structural strength while the overall structure accommodates thermal expansion. This segmentation enables the system to have both local rigidity for structural stability and global flexibility for thermal compliance.
Solution Approach 2:
The patent changes the mechanical parameters of the supporting unit by introducing compliant structures with specific flexibility characteristics. This allows the supporting unit to transition between rigid and flexible states depending on the operational condition, maintaining structural stability during operation while accommodating thermal changes during packaging and mounting.
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 stabilizes the oscillation mode and prevents fluctuations in resonance frequency, ensuring consistent performance of the light deflector across varying conditions.
Implementation Method 1
springs that deform earlier than the movable parts
Data Source
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AI summary
Alight deflector (13) includes a reflector (120) having a reflecting surface (14), a movable part (130a) coupled to the reflector (120), a drive circuit (140a) configured to cause the movable part (130a) to deform so as to oscillate the reflector (120), a supporting unit (150a) having an opening in part; and a spring (160a) having a bending structure. The spring (160a) is disposed between the movable part (130a) and the supporting unit (150a), the spring (160a) coupled to each of the movable part (130a) and the supporting unit (150a).