Angular Velocity Sensor Wiring Noise Reduction
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Solution Overview
Problem
Existing angular velocity sensors using piezoelectric vibration types face challenges in accurately detecting angular velocity due to noise interference from flexural deformation of the sensor element, which affects detection accuracy.
Innovation Solution
The sensor element incorporates a piezoelectric body with a frame, driving arms, and a detecting arm, where the driving arms are excited to bend in opposite directions, generating a Coriolis force that causes the detecting arm to vibrate, and the detection-use wiring parts are configured to minimize noise interference by positioning the first and second detection-use wiring parts alongside each other on the frame, reducing the difference in charges generated, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection-use wiring parts are positioned separately on the sensor element, then the structural complexity is reduced, but noise interference from flexural deformation increases, deteriorating detection accuracy
Solution Approach 1:
The patent merges the first and second detection-use wiring parts by positioning them alongside each other on the frame, forming a paired configuration. This merging approach reduces the spatial separation between wiring parts, thereby minimizing the difference in charges generated during flexural deformation and reducing noise interference, which directly improves detection accuracy without significantly increasing structural complexity
Solution Approach 2:
The patent applies the equipotentiality principle by positioning the detection-use wiring parts symmetrically alongside each other on the frame, ensuring that they experience similar electrical potentials during flexural deformation. This symmetric positioning minimizes potential differences and charge imbalances between the wiring parts, thereby reducing noise and improving measurement precision
2Reliability
If the sensor element structure is simplified, then the manufacturing cost is reduced, but noise from flexural deformation increases, affecting detection reliability
Solution Approach 1:
The patent applies local quality by optimizing the positioning of detection-use wiring parts specifically on the frame, rather than simplifying the entire sensor structure. The wiring parts are positioned alongside each other in a specific location where they can minimize charge differences during flexural deformation, thereby improving detection reliability without requiring complex changes to the overall manufacturing process
3Measurement precision
If the detection-use wiring parts are positioned to minimize charge difference, then noise interference is reduced, but the wiring arrangement complexity increases
Solution Approach 1:
The patent merges the first and second detection-use wiring parts by positioning them alongside each other on the frame, forming a paired configuration. This merging approach reduces the spatial separation between wiring parts, thereby minimizing the difference in charges generated during flexural deformation and reducing noise interference, which directly improves detection accuracy without significantly increasing structural complexity
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 significantly reduces noise caused by flexural deformation, leading to improved detection accuracy and reliability of angular velocity measurements.
Implementation Method 1
an AC voltage is supplied to a piezoelectric body to excite the piezoelectric body. When this excited piezoelectric body is rotated, a Coriolis force having a magnitude in accordance with the rotation speed (angular velocity) is generated in a direction perpendicular to the direction of excitation. The piezoelectric body also vibrates by this Coriolis force. Further, by detecting an electrical signal generated in accordance with the deformation of the piezoelectric body due to this Coriolis force, the angular velocity of the piezoelectric body can be detected.
Implementation Method 2
When this excited piezoelectric body is rotated, a Coriolis force having a magnitude in accordance with the rotation speed (angular velocity) is generated in a direction perpendicular to the direction of excitation. The piezoelectric body also vibrates by this Coriolis force.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
In a sensor element, a frame has an x-axis direction as a longitudinal direction. Two driving arms extend from the frame alongside each other in a y-axis direction. A detecting arm extends from the frame in the y-axis direction at a position which is a center of the two driving arms in the x-axis direction. A plurality of excitation-use wiring parts connect a plurality of excitation electrodes and terminals with connection relationships where the two driving arms vibrate with inverse phases in the x-axis direction. A first detection-use wiring part is connected to a first detecting electrode and a first detection-use terminal. A second detection-use wiring part is connected to a second detecting electrode and a second detection-use terminal. At least a portion of the first detection-use wiring part and at least a portion of the second detection-use wiring part extend alongside each other on the frame over 1/4 or more of a length of the frame in the longitudinal direction of the frame.