Optimized Angular Speed Transducer for Miniature Applications
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Summary
Problems
Existing angular velocity measurement transducers using piezoelectric tuning forks face inefficiencies due to non-rectilinear electrical paths between detection electrodes, leading to suboptimal measurement and complex manufacturing challenges, particularly in miniature on-board applications.
Innovation solutions
The detection electrodes are arranged in a cross-shaped section with protruding parts on the detection leg, allowing for a simple manufacturing method and a substantially rectilinear electrical path, along with mechanical uncoupling at the base to minimize size.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If detection electrodes are arranged on lateral faces of the tuning fork, then the electrical field can be detected, but the electrical path becomes non-rectilinear causing field line loss and suboptimal measurement
Why choose this principle:
The detection leg is divided into two separate legs, with detection electrodes arranged on each leg. This segmentation allows the electrical field to be detected along a rectilinear path through each leg independently, preventing field line loss while maintaining detection capability.
Principle concept:
If detection electrodes are arranged on lateral faces of the tuning fork, then the electrical field can be detected, but the electrical path becomes non-rectilinear causing field line loss and suboptimal measurement
Why choose this principle:
The detection electrodes are arranged in a plane perpendicular to the excitation vibration plane, creating a three-dimensional detection configuration. This dimensional arrangement ensures that the electrical field lines follow a rectilinear path through the detection leg, optimizing measurement while reducing energy loss.
Application Domain
Data Source
AI summary:
The detection electrodes are arranged in a cross-shaped section with protruding parts on the detection leg, allowing for a simple manufacturing method and a substantially rectilinear electrical path, along with mechanical uncoupling at the base to minimize size.
Abstract
The invention concerns a transducer for measuring an angular velocity formed by a single piezoelectric tuning fork ( 21 ) that rotates at said angular velocity. The tuning fork includes two vibrating legs( 23, 24 ) extending from a base ( 22 ), means ( 25 a, 25 b, 26 a, 26 b ) exciting a first vibration of the tuning fork, arranged on the excitation leg ( 23 ), and means ( 27 a, 27 b, 28 a, 28 b ) detecting a second vibration of the tuning fork generated in response to the first vibration and to a rotation of the tuning fork, arranged on the detection leg ( 24 ). The detection leg has a cross-shaped section including two top lateral faces ( 33, 34 ) and two bottom lateral faces ( 37, 38 ), separated by protruding parts ( 41, 42 ) projecting with respect to said faces. The detection means include first ( 27 a ) and second ( 28 a ) detection electrodes arranged facing each other, each being arranged on one of the top lateral faces ( 33, 34 ), such that the electrical field between the first and second detection electrodes is substantially rectilinear through the detection leg, and third ( 27 b ) and fourth ( 28 b ) detection electrodes arranged facing each other, each being arranged on one of the bottom lateral faces ( 37, 38 ), such that the electrical field between the third and fourth detection electrodes is substantially rectilinear through the detection leg.