Mirror Device Drive Control Beat Frequency Startup
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Solution Overview
Problem
Mirror devices with hysteresis characteristics face challenges in quickly setting the deflection angle at startup, leading to prolonged setup times when used in projectors, due to frequency hysteresis effects.
Innovation Solution
A mirror device drive control apparatus that detects the beat frequency from abnormal vibrations and adjusts the drive signal frequency using a start-up processing section to rapidly achieve the desired deflection angle, employing a drive section, detection section, and control section to iteratively increase and adjust the drive signal frequency based on detected vibration amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mirror device is driven with a large deflection angle at startup to achieve the desired field angle, then the field angle requirement is met, but the setup time is prolonged due to hysteresis characteristics
Solution Approach 1:
The system performs preliminary frequency adjustment actions before the mirror device is fully operational. By detecting the drive frequency and adjusting it in advance according to the hysteresis characteristic map, the system prepares the optimal drive frequency so that when large deflection angle operation is required, the setup time is minimized because the frequency adjustment has already been completed.
Solution Approach 2:
The system changes the drive frequency parameter dynamically based on the desired deflection angle. By maintaining a map of drive frequency versus deflection angle relationships and adjusting the frequency parameter in advance, the system compensates for hysteresis effects and achieves the target field angle configuration more quickly.
2Measurement precision
If the drive frequency is adjusted to compensate for hysteresis characteristics, then the deflection angle accuracy is improved, but the control complexity increases
Solution Approach 1:
The system implements feedback by detecting the actual drive frequency and using it to determine the appropriate frequency adjustment. The control section continuously monitors the drive frequency, references the hysteresis characteristic map, and adjusts the drive signal frequency accordingly, creating a closed-loop control system that improves deflection angle accuracy while automating the compensation process.
Solution Approach 2:
The system creates a simplified model or map of the hysteresis characteristic relationships between drive frequency and deflection angle. This map serves as a lookup table that stores pre-determined frequency adjustments for various deflection angles, allowing the control system to quickly determine the appropriate frequency correction without complex real-time calculations, thus reducing control complexity.
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 significantly reduces the time required to set the deflection angle of the mirror device at startup, improving operational efficiency by leveraging beat frequency detection and frequency adjustments to mitigate hysteresis effects.
Implementation Method 1
the start-up processing section detects a frequency of an envelope included in abnormal vibration of the movable section as a beat frequency fb based on the detection signal of the detection section
Data Source
AI summary
A mirror device drive control apparatus adapted to perform drive control of a mirror device having a hysteresis characteristic, includes: a drive section adapted to drive the mirror device with a drive signal; a detection section adapted to detect a displacement of a movable section of the mirror device, and to generate and then output a detection signal corresponding to the detection; and a start-up processing section adapted to perform a start-up process of the mirror device, wherein the start-up processing section detects a frequency of an envelope included in abnormal vibration of the movable section as a beat frequency fb based on the detection signal of the detection section, obtains a predetermined frequency f1 based on a frequency f of the drive signal of the mirror device with which the beat frequency is detected and the beat frequency fb, and drives the mirror device again with the drive signal having the frequency f1.