Oblique Vibrating Arms for Multi-Axis Angular Velocity Detection
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Solution Overview
Problem
Existing vibrating reeds for physical quantity detection have limitations in detecting rotation around multiple axes due to weak connectivity between vibration modes, leading to increased circuit size and cost, and difficulty in downsizing.
Innovation Solution
A physical quantity detection element with obliquely extending drive and detection vibrating arms that improve connectivity, allowing for suppression of leakage vibration and excitation by a single oscillator circuit, enabling detection of angular velocities around multiple axes with reduced impedance and increased Q-value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If drive arms or vibration units individually extend from the base part, then the structure is simple, but the connectivity of vibration modes is weak requiring fine adjustment and increasing circuit size
Solution Approach 1:
The patent merges the drive arms and detection vibrating arms into a single integrated structure where both types of arms share common support portions extending from the base part. This integration strengthens the connectivity between vibration modes by eliminating the need for separate individual extensions, thereby reducing the requirement for fine adjustment while maintaining structural simplicity.
2Reliability
If two oscillator circuits are used to excite both vibrations, then the connectivity is improved, but the area of circuit configuration increases and downsizing becomes difficult
Solution Approach 1:
The patent designs a universal oscillator circuit that can excite both drive vibrations and detection vibrations through the integrated arm structure. The single oscillator circuit utilizes the common support portions and oblique extension geometry to generate both vibration modes, eliminating the need for a second oscillator circuit and thereby reducing the circuit configuration area while maintaining strong connectivity.
3Device complexity
If drive arms extend along the Y-axis to vibrate in the X-axis direction, then the structure is simplified, but rotation detection capability is limited to only one axis
Solution Approach 1:
The patent introduces oblique extension of the detection vibrating arms at angles between 0-45 degrees relative to the X-axis, adding a dimensional component that enables detection of rotation around the X-axis. This angular dimension allows the system to detect rotations in multiple directions while maintaining the simple structure of arms extending from the base part.
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 efficient detection of angular velocities around multiple axes with improved connectivity and reduced circuit size and cost, enhancing detection accuracy and reducing the need for fine-tuning of natural resonance frequencies.
Implementation Method 1
a first drive detection vibrating arm (5a) obliquely extending with respect to the X-axis from the first connection part side of the first drive vibrating arm (4a)... comprising a piezoelectric material
Data Source
AI summary
A physical quantity detection element includes a base part, a first connection part and a second connection part respectively extending from the base part in opposite directions to each other along the X-axis, a pair of first drive vibrating arm and second drive vibrating arm and a pair of third drive vibrating arm and fourth drive vibrating arm respectively extending from the first connection part or the second connection part in opposite directions to each other along the Y-axis, a first drive detection vibrating arm and a second drive detection vibrating arm obliquely extending from the first connection part, a third drive detection vibrating arm and a fourth drive detection vibrating arm obliquely extending from the second connection part, and a first detection vibrating arm and a second detection vibrating arm respectively extending from the base part in opposite directions to each other along the Y-axis.