Micro-oscillation Element Weight Balance via Counterweight
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Solution Overview
Problem
Conventional micro-oscillation elements suffer from poor weight balance, leading to inaccurate rotational displacement and degraded sensing characteristics in applications like acceleration sensors and angular speed sensors due to their nonsymmetrical structure and gravity-induced instability.
Innovation Solution
A micro-oscillation element design featuring a base frame, oscillating portion, and link portion with a weight portion adjacent to the first driving electrode, achieving desirable weight balance by distributing mass symmetrically around the axis of motion, facilitated by a multilayer substrate structure with conductor and insulating layers, and additional weight portions to balance the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the oscillating portion is designed with a nonsymmetrical structure to accommodate functional components, then the device can perform its oscillation function, but the weight balance deteriorates leading to gravity-induced instability and inaccurate rotational displacement
Solution Approach 1:
The patent introduces a dedicated weight portion as a counterweight element to balance the nonsymmetrical oscillating portion. This weight portion is specifically positioned to compensate for the gravitational imbalance caused by the asymmetric arrangement of functional components like the mirror portion and combtooth electrode, thereby restoring weight balance without compromising functional adaptability
Solution Approach 2:
The oscillating portion is segmented into distinct functional components (mirror portion, combtooth electrode, beam portion) and a separate weight portion. This segmentation allows each component to be optimized for its specific function while the weight portion is independently positioned to achieve overall weight balance, resolving the contradiction between functional design and stability
2Ease of operation
If the oscillating portion is made asymmetric to accommodate the combtooth electrode and mirror portion, then the driving mechanism can be implemented, but the rotational displacement accuracy deteriorates due to poor weight balance
Solution Approach 1:
The weight portion acts as a counterweight that compensates for the asymmetric distribution of functional components. By carefully positioning this weight portion, the patent restores weight balance which is critical for achieving accurate rotational displacement during oscillation, thereby improving measurement precision while maintaining the asymmetric driving mechanism structure
3Ease of manufacture
If the structure is simplified without dedicated weight balance components, then the manufacturing process is easier, but the sensing characteristics are degraded due to gravity-induced instability
Solution Approach 1:
The weight portion is merged with the oscillating portion structure, forming an integrated component rather than a separate assembly. This merging approach allows the weight balance function to be incorporated into the existing manufacturing process without requiring additional complex assembly steps, thereby maintaining ease of manufacture while improving sensing characteristics through proper weight distribution
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 design enables precise control of rotational displacement and enhances sensing performance by ensuring accurate weight distribution, reducing the impact of gravity and improving the structural symmetry of the oscillating portion.
Implementation Method 1
The combtooth electrodes 42, 53 serve to generate electrostatic force in cooperation with each other, and are located at different levels in height from each other
Data Source
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AI summary
A micro-oscillation element includes a base frame, an oscillating portion, and a link portion connecting the base frame and the oscillating portion to each other. The oscillating portion has a movable functional portion, a first driving electrode connected to the movable functional portion, and a weight portion joined to the first driving electrode. The link portion defines an axis of the oscillating motion of the oscillating portion. The second driving electrode, fixed to the base frame, generates driving force for the oscillating motion in cooperation with the first driving electrode.