Scanning Mirror Torsion Spring Non-Linearity Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional techniques fail to accurately compute the non-linear spring constant k3 and spring constant ratio r3 for torsion spring designs in scanning mirror assemblies, limiting the optimization of frequency bandwidth and performance in optical sensing systems like LiDAR.
Innovation Solution
The design of scanning mirror assemblies includes a plurality of torsion springs with both linear and non-linear spring constants, where the ratio of non-linear to linear spring constant is optimized to achieve a predetermined threshold, enabling accurate computation and adjustment of design parameters to maximize oscillation frequency bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional techniques are used to design torsion springs, then the design process is simple, but the non-linear spring constant k3 and spring constant ratio r3 cannot be computed accurately, limiting frequency bandwidth optimization
Solution Approach 1:
The patent applies parameter changes by systematically varying the torsion spring geometry parameters (width w, length L, thickness t, and offset d) to achieve desired non-linear spring constant k3 and spring constant ratio r3 values. The design process involves computing these parameters based on target performance specifications, thereby resolving the contradiction between computation accuracy and design complexity through a structured parameter optimization approach.
2Productivity
If torsion springs with optimized non-linearity are designed, then the oscillation frequency bandwidth is enhanced, but the design and computation process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-computing the torsion spring parameters (w, L, t, d) during the design phase to achieve target non-linear spring constant k3 and spring constant ratio r3 values. This preliminary computation ensures that the scanning mirror assembly achieves optimal oscillation frequency bandwidth without requiring complex real-time adjustments, thereby resolving the contradiction between productivity enhancement and design complexity.
3Productivity
If the spring constant ratio r3 is increased to improve frequency bandwidth, then the oscillation frequency bandwidth increases, but the torsion spring design becomes more difficult to manufacture
Solution Approach 1:
The patent applies parameter changes by providing specific design equations and relationships that guide the selection of torsion spring parameters (w, L, t, d) to achieve target spring constant ratios r3. This systematic approach enables manufacturers to produce high non-linearity torsion springs with improved ease of manufacture by following computed parameter specifications rather than relying on trial-and-error methods.
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 the precise tailoring of torsion spring designs to achieve a desired spring constant ratio, enhancing the oscillation frequency bandwidth and improving the performance of scanning mirror assemblies in optical sensing systems.
Implementation Method 1
a first set of torsion springs coupled between the scanning mirror and the substrate... the plurality of torsion springs may collectively have a non-linear spring constant and a linear spring constant
Implementation Method 2
A MEMS mirror may be operated at or near resonance. Using resonance may enable optical sensing systems to obtain large mirror scanning angles in a relatively small amount of time as compared to a non-resonating mirror
Data Source
AI summary
Embodiments of the disclosure provide a scanning mirror assembly for an optical sensing system. The scanning mirror assembly may include a scanning mirror configured to rotate around an axis of rotation. The scanning mirror assembly may further include a plurality of torsion springs coupled to at least one side of the scanning mirror along the axis of rotation. In certain aspects, the plurality of torsion springs may collectively have a non-linear spring constant and a linear spring constant. In certain other aspects, a ratio of the non-linear spring constant over the linear spring constant may meet a predetermined threshold.