Ultrasonic Sensor Coupling Electrode Corner Positioning
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Solution Overview
Problem
Ultrasonic sensors with piezoelectric elements face issues with vibration hindrance due to wide wiring electrodes, leading to deformation-related disconnection, especially when stress is applied at the center of the piezoelectric element, affecting the vibration characteristics and reliability of the sensor.
Innovation Solution
The ultrasonic sensor design includes a substrate with a vibrating plate and a piezoelectric element, where the coupling electrode is strategically positioned to minimize deformation at the corner portions, reducing the likelihood of disconnection by being coupled to the corner neighborhood ranges rather than the center, and the line width of the wiring electrodes is made smaller than the piezoelectric element to reduce vibration hindrance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the line width of the wiring electrode is made smaller than the width of the piezoelectric element, then vibration hindrance is suppressed, but the wiring electrode may be disconnected due to deformation
Solution Approach 1:
The patent applies local quality by differentiating the coupling position on the piezoelectric element. Instead of uniformly coupling to the center or edges, the wiring electrode is specifically coupled to the corner portion neighborhood range. This localized coupling position has lower deformation amplitude compared to the center, thereby reducing vibration hindrance while maintaining connection reliability.
Solution Approach 2:
The patent introduces a new spatial dimension for coupling by defining the corner portion neighborhood range as a specific region. This involves calculating geometric parameters (intersection points of virtual lines and circles) to precisely identify the optimal coupling location, which is a two-dimensional region rather than a simple one-dimensional position.
2Stability of the object's composition
If the wiring electrode is coupled to the center part of the side of the rectangular piezoelectric element, then vibration hindrance is suppressed, but disconnection occurs due to maximum deformation at the center
Solution Approach 1:
The patent identifies that the center part of the side has maximum deformation while the corner portion neighborhood range has lower deformation. By locally selecting the corner region for coupling, the design achieves both vibration hindrance suppression and connection reliability.
Solution Approach 2:
The patent converts the harmful effect of deformation into a beneficial design criterion. Instead of avoiding deformation generally, it exploits the deformation distribution pattern to select the corner region where deformation is naturally lower, turning the deformation characteristic into a guide for optimal coupling position selection.
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 enhances the reliability of the ultrasonic sensor by reducing the risk of wiring electrode disconnection and maintaining effective vibration characteristics, thereby improving the overall performance of the distance measuring apparatus.
Implementation Method 1
reception of the ultrasonic wave may be detected by conversion of vibration of the vibrating plate into an electrical signal using the piezoelectric element
Implementation Method 2
the vibrating plate may be vibrated to output ultrasonic wave by input of a signal to the piezoelectric element
Implementation Method 3
When ultrasonic wave is received by the vibrating plate, reception of the ultrasonic wave may be detected
Data Source
AI summary
An ultrasonic sensor includes an opening portion, vibrating plate covering the opening portion, piezoelectric element overlapping with the opening portion, and a coupling electrode coupled to the piezoelectric element, extended from a position overlapping the opening portion to a position not overlapping the opening portion, and having a line width smaller than a width of the piezoelectric element. The piezoelectric has a first and second line portion, and a corner portion coupling the first and second line portions, when an intersection point connects a center of gravity of the piezoelectric and the corner portion with a virtual circle inscribed in the outline of the piezoelectric is a first intersection point of a tangent line. The first intersection point with the first and second line portions are a second and third intersection points, the coupling electrode coupled to a corner portion from the second intersection point to the third intersection point.