Optical Scanning Apparatus Resonance Frequency Correction
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Solution Overview
Problem
Existing optical scanning apparatuses face challenges in achieving high resolution and efficient driving due to fluctuations in resonance frequencies caused by manufacturing variations and environmental factors, particularly during Lissajous scanning, which affects the precision of the light trace and frame rate compliance.
Innovation Solution
The optical scanning apparatus calculates drive frequencies using specific mathematical formulas to ensure precise tracing within the desired frame rate, incorporating a scanning device that scans light in two perpendicular axes with controlled resonance frequencies, and an optical reflection device with piezoelectric driving parts to maintain high driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If drive frequencies are set based on predetermined mesh count and oscillator clock count, then the Lissajous trace resolution is improved, but the trace precision deteriorates due to fluctuations in actual resonance frequencies
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for drive frequencies in a lookup table before operation. The system measures actual resonance frequencies, retrieves pre-prepared correction data, and applies frequency adjustments without real-time computation, thus maintaining trace precision while accommodating resonance frequency fluctuations.
Solution Approach 2:
The patent implements feedback by continuously monitoring the actual resonance frequencies of the scanning axes and using this information to adjust the drive frequencies. The system measures the resonance frequencies, compares them with nominal values, and applies corrections to maintain precise Lissajous traces despite manufacturing variations and environmental changes.
2Productivity
If drive frequencies are adjusted to match actual resonance frequencies, then driving efficiency is improved, but trace precision deteriorates due to frequency fluctuations from manufacturing and environmental variations
Solution Approach 1:
The patent prepares correction data in advance by pre-calculating appropriate drive frequency adjustments for various resonance frequency conditions and storing them in a lookup table. This allows the system to quickly retrieve and apply pre-optimized frequency corrections that maintain trace precision while adapting to actual resonance frequencies.
Solution Approach 2:
The patent changes the drive frequency parameter dynamically based on measured resonance frequencies. By adjusting the drive frequencies to match actual resonance conditions while applying pre-calculated corrections, the system maintains both high driving efficiency and trace precision despite manufacturing and environmental variations.
3Manufacturing precision
If the Lissajous period is set to achieve high resolution, then the beam coverage is improved, but the frame rate compliance deteriorates due to frequency mismatches
Solution Approach 1:
The patent uses feedback from actual resonance frequency measurements to adjust drive frequencies, ensuring that the Lissajous period maintains the correct relationship with the frame rate. This closed-loop approach ensures both high resolution through precise trace drawing and compliance with frame rate requirements.
Solution Approach 2:
The patent dynamically adjusts drive frequency parameters based on measured resonance frequencies to maintain the optimal Lissajous period. By changing the drive frequencies to match actual resonance conditions while preserving the mathematical relationship required for high-resolution scanning, the system achieves both resolution and frame rate compliance.
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 approach allows for high-resolution scanning with precise trace drawing and improved driving efficiency, capable of adapting to fluctuations in resonance frequencies, thereby maintaining optimal performance across various environmental conditions.
Implementation Method 1
an optical reflection device with piezoelectric driving parts to maintain high driving efficiency
Implementation Method 2
scans the beam of light in two axial directions that are substantially perpendicular to each other at a first frequency fH and a second frequency fL
Data Source
AI summary
An optical scanning apparatus is configured to include a light source that emits a beam of light, and a scanning device that scans the beam of light in two axial directions that are mutually substantially perpendicular at a first frequency fH and a second frequency fL. The scanning device calculates the first frequency fH and the second frequency fL by using predetermined mathematical formulas, and scans the beam of light at the calculated first frequency fH and second frequency fL.