Quartz Stress Sensitive Element Integrated Beam Design
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Solution Overview
Problem
Existing acceleration sensors with projecting portions on quartz beams require high manufacturing costs and increased man-hours due to complex bonding processes, limiting their cost-effectiveness and efficiency.
Innovation Solution
A stress-sensitive element with a vibrating arm, integrated beam portions, and a connecting portion, where the fixing portion is strategically located to allow easy bending and stress detection, fabricated using etching processes to reduce costs and enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If projecting portions are formed on the beam and bonding is performed, then stress detection sensitivity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the beam portion and vibrating arm into a single integrated structure made from the same quartz material, eliminating the need for separate bonding processes. The connecting portion integrates these components while providing necessary mechanical coupling, thereby reducing manufacturing complexity while maintaining stress detection sensitivity through the integrated design.
Solution Approach 2:
The connecting portion serves as an intermediary element that couples the beam portion and vibrating arm while allowing for stress transmission. This intermediate structure enables stress detection functionality without requiring complex bonding of projecting portions, thus resolving the contradiction between sensitivity and manufacturing complexity.
2Force
If projecting portions are formed on the beam, then stress magnitude is increased, but manufacturing time and cost increase
Solution Approach 1:
By combining the beam and vibrating arm into an integrated structure, the patent eliminates the time-consuming bonding process required for separate projecting portions. The integrated design maintains stress magnitude through the connecting portion while significantly reducing manufacturing time.
Solution Approach 2:
The patent changes the structural parameters by using an integrated design with a connecting portion that has different mechanical properties than the beam portions. This allows for optimized stress transmission without requiring additional manufacturing steps for projecting portions, thus reducing manufacturing time while maintaining force transmission capability.
3Measurement precision
If the beam plate thickness is reduced, then sensitivity is improved, but structural strength decreases
Solution Approach 1:
The patent applies local quality by creating a connecting portion with different thickness and mechanical properties than the beam portions. The connecting portion can be designed with optimized local characteristics that provide sufficient strength while allowing the overall structure to achieve high sensitivity through reduced effective mass and improved stress coupling.
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 solution enables cost-effective and sensitive detection of stress by minimizing manufacturing complexity and enhancing the stability and sensitivity of stress-frequency changes, reducing the need for complex bonding and increasing the efficiency of acceleration detection.
Implementation Method 1
change in resonance frequency of a piezoelectric resonator
Implementation Method 2
change in resonance frequency
Implementation Method 3
the weight 80 makes the beam 60 bend, and compression stress or extension stress is then applied
Data Source
AI summary
A stress sensitive element includes a vibrating arm having an electrode, a beam portion integrated with the vibrating arm at both ends of the vibration arm, and a connecting portion interposed between the beam portion and the vibrating arm. The element is placed by providing a fixing portion to one of the connecting portion and the beam portion, and an extending direction of the vibrating arm is orthogonal to a stress direction to be detected.