Piezoelectric Vibration Device Wire Routing for Connection Reliability
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Solution Overview
Problem
Existing tactile presentation devices face connection failure due to the expansion and contraction of piezoelectric films used for generating vibrations, leading to peeling or breakage at the connecting sections.
Innovation Solution
A vibration device design that includes a diaphragm with distinct vibration nodes and regions, where the extended wire is connected outside the diaphragm's perimeter from a section with less vibration, preventing connection failure by minimizing stress at the connecting points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead wire is connected to each electrode formed on both sides of the piezoelectric film, then electrical connection is established for voltage application, but connection failure such as peeling occurs due to expansion and contraction of the film
Solution Approach 1:
The patent introduces an extended wire as an intermediary element that connects the electrode to the external circuit. This extended wire serves as a mediator that absorbs the mechanical stress from film expansion and contraction, preventing direct stress transmission to the fragile connection point between the lead wire and electrode, thus resolving the contradiction between establishing electrical connection and maintaining connection strength
Solution Approach 2:
The patent segments the wire connection into two functional parts: a short connection section that remains stationary at the electrode, and an extended wire section that absorbs expansion and contraction movements. This segmentation allows the connection to maintain electrical continuity while isolating the fragile connection point from mechanical stress, preventing peeling and improving connection reliability
2Reliability
If the extended wire is positioned in the second region (vibration region), then electrical connection is maintained, but connection failure occurs due to vibration-induced stress
Solution Approach 1:
The patent extracts the extended wire from the vibration-prone second region and positions it in the first region (node of vibration) or extends it outside the diaphragm perimeter. This extraction removes the extended wire from the harmful vibration environment while maintaining its electrical connection function, thereby eliminating vibration-induced stress and connection failure
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
Prevents connection failure and peeling by ensuring the connecting section between the extended wire and electrode experiences minimal expansion and contraction, maintaining stable contact and efficient vibration transmission.
Implementation Method 1
a film which expands and contracts in a planar direction by application of a voltage
Implementation Method 2
The diaphragm vibrates in the normal direction
Data Source
AI summary
A vibration device that includes a diaphragm having a perimeter; a film which expands and contracts in a planar direction by application of a voltage, and an electrode on each main surface thereof; and a wire extended from the electrode outside of the perimeter of the diaphragm. The diaphragm has a first region in a node of vibration and a second region in a position other than the node of vibration. The wire has a section extended from the second region toward the first region, or is extended from the first region outside of the perimeter of the diaphragm.