Actuator Nonlinear Constant Optimization for Large Deflection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The non-linear leaping phenomenon occurs in light scanning apparatus actuators due to non-linearity, causing the deflection angle to saturate and preventing large deflection angles, even when increasing drive voltage.
Innovation Solution
An actuator design with a torsion beam, a first drive beam, and a connection beam, where the structural non-linear constant β and spring constant k are optimized to satisfy the equation β = 0.05 × k − A × 10^−6, with 3.5 ≤ A ≤ 15.5, to suppress non-linear oscillation and enable stable driving at large deflection angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the drive voltage is increased to enlarge the deflection angle, then the deflection angle can be increased, but the non-linear leaping phenomenon occurs causing the deflection angle to saturate and preventing further increase
Solution Approach 1:
The patent applies parameter changes by optimizing the structural non-linear constant β and spring constant k to satisfy a specific mathematical relationship (β = 0.05k - A×10^-6 where 3.5 ≤ A ≤ 15.5). This parameter optimization suppresses the non-linear leaping phenomenon while enabling large deflection angles, directly resolving the contradiction between increasing deflection angle and preventing non-linear oscillation
Solution Approach 2:
The patent employs beforehand cushioning by designing the actuator structure with optimized β and k values before operation. This pre-optimization creates a structural configuration that inherently suppresses non-linear leaping phenomena, allowing the system to operate at large deflection angles without experiencing abrupt changes or saturation
2Manufacturing precision
If the structural non-linearity is not optimized, then the backbone curve deflects to low or high frequency side, but this causes deflection angle saturation even with increased voltage
Solution Approach 1:
The patent changes the structural parameters β and k to satisfy a specific relationship, which positions the backbone curve at the desired frequency while enabling large deflection angles. This parameter optimization simultaneously addresses both the deflection angle requirement and the backbone curve position requirement
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
The optimized actuator design prevents non-linear leaping phenomena, allowing for stable operation at large deflection angles and minimizing abrupt changes in deflection angle due to frequency changes or aging degradation.
Implementation Method 1
a characteristic curve of a deflection angle relative to a frequency of a light scanning apparatus such as the resonance/non-resonance 2D-MEMS mirror, a curve obtained by connecting resonant points at a time of enlarging the deflection angle by increasing the applied voltage to a piezoelectric element
Implementation Method 2
The mirror is displaced in a direction of rotating around a horizontal direction rotation axis by resonant drive of a horizontal drive beam
Data Source
AI summary
An actuator includes a torsion beam configured to support a target object, a first drive beam having a first drive source, and a connection beam configured to connect the torsion beam with the first drive beam, and a frame body configured to fix the first drive beam, wherein the actuator applies force of rotating the torsion beam in a direction around a first axis by a resonant drive of the first drive beam so as to cause the target object to swing, and when a structural non-linear constant of the actuator is β [Nm/rad3] and a spring constant of the actuator is k [Nm/rad], [Equation 1] is satisfied:[Equation 1]β=0.05×k−A×106 (1),where 3.5≤A≤15.5.