Gyro Sensor Wiring Layer Design for Crosstalk Reduction
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Solution Overview
Problem
Existing gyro sensors face challenges in accurately detecting angular velocities in multiaxial directions due to noise interference and limited functionality, particularly as electronic devices miniaturize and become more complex.
Innovation Solution
A sensor device with a vibrator unit, annular base portion, coupling portions, and a wiring layer is designed, where piezoelectric drive and detection units are arranged to minimize crosstalk between drive and detection wirings, allowing for precise detection of angular velocities across three orthogonal axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If detection wiring patterns are arranged between drive wiring patterns on the front surface of the vibrator, then wiring compactness is improved, but noise enters the detection wiring from drive wiring, worsening detection accuracy
Solution Approach 1:
The patent moves the detection wiring from the front surface of the vibrator to the back surface of the vibrator. This spatial relocation in another dimension (from front to back surface) allows the detection wiring to be positioned away from the drive wiring, reducing capacitive coupling and noise interference while maintaining compact wiring layout.
Solution Approach 2:
The patent segments the wiring layout by separating drive wiring and detection wiring into different spatial zones. Drive wiring is positioned on the front surface while detection wiring is positioned on the back surface, creating physical and electrical isolation between the two types of wiring to minimize noise coupling.
2Volume of moving object
If the sensor is miniaturized to meet compactness requirements, then device size is reduced, but noise interference increases, worsening detection accuracy
Solution Approach 1:
By utilizing the back surface of the vibrator for detection wiring, the patent creates additional spatial room within the miniaturized sensor structure. This dimensional utilization allows compact sensor design while maintaining adequate separation between drive and detection wiring, preventing noise interference even at small scales.
3Adaptability or versatility
If multiple detection signals are provided for multiaxial detection, then detection functionality is improved, but wiring complexity and noise interference increase
Solution Approach 1:
The patent utilizes the back surface of the vibrator to accommodate multiple detection wiring patterns for multiaxial detection. This spatial arrangement on the back surface allows multiple detection signals to be routed separately away from drive wiring, reducing capacitive coupling and noise interference while maintaining multiaxial detection functionality.
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 high-accuracy detection of angular velocities in multiaxial directions, maintaining mechanical symmetry and reducing noise interference, thus enhancing the sensor's accuracy and compactness.
Implementation Method 1
a drive electrode for causing the vibrator to vibrate using an inverse piezoelectric effect
Implementation Method 2
a detection electrode for detecting a deformation of the vibrator using a piezoelectric effect
Implementation Method 3
The vibration-type gyro sensor detects an angular velocity by causing a vibrator to vibrate at a predetermined frequency and detecting a Coriolis force generated in the vibrator
Data Source
AI summary
Provided is a sensor device that includes a vibrator unit, an annular base portion, a plurality of coupling portions, and a wiring layer. The wiring layer includes a plurality of drive wirings and a plurality of detection wirings. The plurality of drive wirings are respectively connected to first and second drive electrodes while being adjacent and parallel to one another. The plurality of detection wirings are respectively connected to first and second detection electrodes while being adjacent and parallel to one another. The wiring layer is provided at each of the plurality of coupling portions to electrically connect a plurality of terminal portions provided in the base portion with a plurality of piezoelectric drive units and first and second piezoelectric detection units provided in the vibrator unit.