Piezoelectric Vibration Device with Segmented Adhesive Bonding
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Solution Overview
Problem
In existing vibration devices, the displacement of piezoelectric vibrators is hindered by the vibration member, leading to reduced vibration efficiency due to adhesive bonding across the entire surface, which can cause peeling and cracking issues.
Innovation Solution
A vibration device design where the adhesive members are strategically positioned between the diaphragm and the vibration member, forming a gap to avoid hindrance, with the piezoelectric element overlapping the adhesive members at the ends to prevent displacement and peeling, and a larger bonding region for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the entire surface of the diaphragm and vibration member are bonded by adhesive member, then bonding strength is improved, but displacement of piezoelectric vibrator is hindered and vibration efficiency deteriorates
Solution Approach 1:
The adhesive member is divided into multiple regions: a first adhesive region for bonding the diaphragm to the vibration member, and a second adhesive region for bonding the piezoelectric vibrator to the vibration member. These regions are positioned separately so that the adhesive member does not cover the entire surface, thereby avoiding hindrance to the displacement of the piezoelectric vibrator while maintaining necessary bonding strength.
2Productivity
If adhesive member is disposed between diaphragm and vibration member, then displacement is enabled, but peeling and cracking occur reducing reliability
Solution Approach 1:
The adhesive member is configured with different properties in different regions: the first adhesive region has bonding function to the diaphragm, the second adhesive region has bonding function to the piezoelectric vibrator, and an uncured resin region is positioned between them to allow displacement. This local differentiation of adhesive properties enables both displacement capability and bonding reliability without causing peeling or cracking.
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 allows for efficient vibration of the piezoelectric vibrator by preventing displacement and peeling, thereby maintaining reliability and amplifying vibration through a load member.
Implementation Method 1
a piezoelectric vibrator having a piezoelectric element and a diaphragm having a pair of main surfaces facing each other, the piezoelectric element being bonded to one of the main surfaces
Implementation Method 2
an adhesive member disposed between the diaphragm and the vibration member and bonding the diaphragm and the vibration member
Data Source
AI summary
A vibration device includes a piezoelectric vibrator having a piezoelectric element and a diaphragm having a pair of main surfaces facing each other, the piezoelectric element being bonded to the main surface, a vibration member where the piezoelectric vibrator is disposed, and an adhesive member disposed between the diaphragm and the vibration member and bonding the diaphragm and the vibration member. Each of the pair of main surfaces of the diaphragm has a rectangular shape when viewed from a facing direction of the pair of main surfaces, and the adhesive member is disposed in a facing manner on at least a pair of sides of the main surfaces.