Circular Arc Vibrator Beam for Gyroscope Sensitivity
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Solution Overview
Problem
Miniaturization of vibrating gyroscopes leads to increased resonant frequency, resulting in reduced detection sensitivity for angular velocity, as the length of the vibrator's leg portions must be shortened, limiting the ability to maintain high sensitivity while preventing resonant frequency escalation.
Innovation Solution
The design incorporates circular or substantially circular arc-shaped beam portions with a base end-side weight portion and a supporting portion, allowing for a smaller footprint without a base portion, thereby decreasing resonant frequency and enhancing detection sensitivity by increasing the node area for vibration support and reducing vibration leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the length of leg portions is shortened to miniaturize the vibrator, then the device size is reduced, but the resonant frequency increases and detection sensitivity decreases
Solution Approach 1:
The patent applies circular arc-shaped beam portions instead of straight beams. The curved geometry allows the beam to achieve greater effective length within a smaller footprint, thereby maintaining lower resonant frequency and higher detection sensitivity while实现 miniaturization of the vibrator structure.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning beam portions and mass portions in specific vertical and horizontal configurations. This dimensional optimization allows the vibrator to maintain functional performance with reduced planar dimensions, achieving miniaturization without sacrificing detection sensitivity.
2Volume of moving object
If the base portion area is reduced to miniaturize the vibrator, then the device size is reduced, but the support stability and wiring ease deteriorate
Solution Approach 1:
The patent merges the base portion with the beam portions by making them integrally formed as a single structure. This integration eliminates the need for separate base components, simplifying the support structure and wiring arrangement while achieving miniaturization. The unified design maintains structural stability without requiring a large separate base area.
3Stability of the object's composition
If the leg portions are made meander-shaped to maintain long beam length, then the resonant frequency is decreased, but the device complexity increases
Solution Approach 1:
The patent employs circular arc-shaped beam portions as a simplified alternative to complex meander shapes. The smooth curved geometry achieves the same functional effect of extending effective beam length while maintaining lower resonant frequency, but with significantly reduced structural complexity and easier manufacturing compared to meander configurations.
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 configuration effectively decreases resonant frequency while maintaining high detection sensitivity for angular velocity, facilitating easier support and wiring, and preventing vibration leakage, even in smaller vibrators.
Implementation Method 1
The piezoelectric body film 103 is formed in the top surface of the dielectric film 102. The electrode film 104 is formed in the top surface of the piezoelectric body film 103.
Implementation Method 2
by detecting the vibration amplitude of the detection vibration mode, it may be possible to detect the angular velocity of the rotational movement
Implementation Method 3
When the vibrator vibrating in the drive vibration mode rotates around the rotation axis, a Coriolis force along the detection axis is applied to the vibrator. When the Coriolis force is applied, the vibrator vibrates in the detection vibration mode.
Data Source
AI summary
A vibrator includes first and second circular or substantially circular arc-shaped beam portions, a base end-side weight portion, and a base end-side weight portion joining portion. The end portions of the first and second circular or substantially circular arc-shaped beam portions in an X-axis positive direction face each other across a distance in a Y-axis direction, and the end portions thereof in an X-axis negative direction are joined to each other. The base end-side weight portion is disposed between the first and second circular or substantially circular arc-shaped beam portions. The base end-side weight portion joining portion extends from a joining portion between the first circular or substantially circular arc-shaped beam portion and the second circular or substantially circular arc-shaped beam portion in the X-axis positive direction, and joined to the base end-side weight portion.