Optical Scanning Device Resonance Frequency Adjustment
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Solution Overview
Problem
Existing optical scanning devices face challenges in accurately adjusting resonance frequency due to variations in processing accuracy and ambient temperature, leading to instability and potential fatigue breakdown of piezoelectric elements.
Innovation Solution
An optical scanning device with an oscillating mirror, a first beam unit, a second beam unit, and a first driving unit, where the first adjusting unit is positioned to adjust the modulus of elasticity of the beam unit independently, reducing the impact of torsional deformation and allowing for precise resonance frequency adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric elements are directly laminated on the beam unit surface to adjust resonance frequency, then resonance frequency adjustment is achieved, but the piezoelectric elements are influenced by torsional deformation during oscillation causing fatigue breakdown and reduced reliability
Solution Approach 1:
The device is divided into functionally independent units: the beam unit for oscillation and the adjusting unit for frequency adjustment. The adjusting unit is positioned separately from the beam unit, with the driving unit interposed between them. This segmentation isolates the piezoelectric elements in the adjusting unit from the torsional deformation of the beam unit during oscillation, preventing fatigue breakdown while maintaining resonance frequency adjustment capability.
2Stability of the object's composition
If additional adjusting mechanisms are added to compensate for resonance frequency variations, then resonance frequency stability is improved, but device complexity increases
Solution Approach 1:
The adjusting unit serves multiple functions: it adjusts the resonance frequency of the oscillating mirror by elastically deforming the beam unit, and simultaneously compensates for resonance frequency variations caused by processing accuracy differences and ambient temperature changes. This multi-functionality is achieved without adding complex mechanisms, as the adjusting unit with piezoelectric elements provides both frequency tuning and stabilization capabilities.
Solution Approach 2:
The resonance frequency is adjusted by changing the elastic modulus of the beam unit through voltage application to the piezoelectric elements in the adjusting unit. This parameter change approach allows continuous resonance frequency adjustment and compensation for environmental variations without mechanical restructuring, maintaining device simplicity while achieving frequency stability.
3Strength
If the beam unit is made more rigid to withstand torsional deformation, then durability is improved, but resonance frequency adjustment range is reduced
Solution Approach 1:
The beam unit's elastic properties are made dynamically adjustable through the adjusting unit. During normal operation, the beam unit maintains sufficient rigidity to withstand torsional deformation. When resonance frequency adjustment is needed, voltage is applied to the piezoelectric elements in the adjusting unit, which elastically deforms the beam unit to change its torsion spring constant and thus adjust the resonance frequency. This dynamic adjustment capability maintains both durability and adaptability.
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 enables high-accuracy adjustment of resonance frequency, maintaining stability and reliability while avoiding the costs and complexity of additional processing steps, thus enhancing operational efficiency and reducing the risk of fatigue breakdown.
Implementation Method 1
a first piezoelectric element unit causes the first beam unit to undergo elastic deformation
Implementation Method 2
an optical scanning device that, by changing the angle between incident light and a reflecting surface, performs scanning of that reflected light
Implementation Method 3
the beam unit undergoes torsional deformation at high speed and for a long time
Data Source
AI summary
An optical scanning device of the present invention includes: an oscillating mirror that reflects incident light; a first beam unit that is coupled to one end of the oscillating mirror; a second beam unit that is coupled to another end of the oscillating mirror; a first driving unit that is coupled to the first beam unit, is disposed between the first beam unit and the first adjusting unit, and that causes the oscillating mirror to oscillate; and a first adjusting unit that is coupled to the first driving unit, and adjusts a modulus of elasticity of the first beam unit by elastically deforming the first beam unit.