Sensor Element Drive Weight Aspect Ratio Optimization
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Solution Overview
Problem
Existing sensor technologies face challenges in increasing detection sensitivity and stabilizing it, particularly in miniaturized forms, due to limitations in design geometry and support structures which affect frequency detuning and impedance.
Innovation Solution
The sensor element design incorporates specific geometric relationships between arm lengths and widths, including drive and detection arms, and optimized connection portions to enhance sensitivity and reduce crystal impedance, while using a support member with flexible wiring for stable mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sensor element is miniaturized, then the size is reduced, but the detection sensitivity decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric dimensions of the drive weight portion. Specifically, it sets the length DHL and width DHW to satisfy 1.5 ≤ DHL/DHW, and optimizes the ratio DHL/DAL between 0.3-2.0. These parameter optimizations enable the sensor to achieve high detection sensitivity even in miniaturized forms by carefully controlling the aspect ratios and dimensional relationships of critical components.
2Volume of moving object
If the connection portion is positioned close to the connection arm for miniaturization, then the size is reduced, but the base portion becomes easily influenced by stress from the lead plate
Solution Approach 1:
The patent introduces an intermediary structure by extending the connection arm between the base portion and the drive weight portion. This extended connection arm acts as a mediator that isolates the base portion from stress influences while still allowing compact overall dimensions. The connection arm serves as a buffer zone that prevents direct stress transmission from the lead plate to the base portion.
3Device complexity
If the wide portion has a square planar view shape, then the structure is simple, but the detection sensitivity cannot be sufficiently increased
Solution Approach 1:
The patent applies asymmetry by defining the wide portion with a rectangular planar view shape where the length and width have a specific ratio relationship. Instead of using a square shape with equal sides, the patent specifies that the length and width should satisfy certain ratio constraints to optimize detection sensitivity. This asymmetric rectangular configuration provides better performance than the symmetric square shape.
Data Source
AI summary
A sensor element includes a base portion, a drive arm that extends from the base portion or a portion which is connected to the base portion, and a detection arm that extends from the base portion. The drive arm includes a drive arm portion that extends from the base portion or a portion which is connected to the base portion, and a drive weight portion that is provided on a front end side with respect to the drive arm portion and has a larger width than the drive arm portion. When a length of the drive weight portion in an extending direction of the drive arm is referred to as DHL and a width of the drive weight portion in a direction orthogonal to the extending direction in a planar view is referred to as DHW, a relationship of 1.5≤DHL/DHW is satisfied.