Piezoelectric Element With Segmented Bonding Members
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Solution Overview
Problem
Conventional piezoelectric elements face limitations in providing sufficient stretching and contracting force due to adhesive layers that constrain the films, preventing effective utilization of weak drive signals.
Innovation Solution
A piezoelectric element with partially aligned bonding members between laminated films, allowing for greater flexibility and reduced constraint, along with the use of fillers to minimize friction and thickness differences, enabling enhanced stretching and contracting capabilities without peeling of electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive layers are used to bond piezoelectric films, then the films are bonded to each other, but the adhesive layers constrain the films and inhibit stretch and contraction of the piezoelectric element
Solution Approach 1:
The bonding members are segmented into discrete elements arranged at intervals rather than continuous adhesive layers. This segmentation allows the films to stretch and contract between the bonding members while maintaining bonding at specific locations, resolving the contradiction between bonding strength and stretching/contracting force.
Solution Approach 2:
The bonding members are positioned at specific locations (near both end portions of the films) rather than uniformly distributed. This local quality approach provides bonding where needed to prevent peeling while leaving other areas free to expand and contract, thus maintaining both bonding strength and stretching/contracting capability.
2Stability of the object's composition
If adhesive layers are used to bond piezoelectric films, then the films are bonded to each other, but it is not possible to provide a sufficient stretching and contracting force from a weak drive signal
Solution Approach 1:
By segmenting the bonding into discrete members at intervals rather than continuous adhesive layers, the structure allows greater freedom of movement and expansion/contraction. This enables the piezoelectric element to generate sufficient stretching and contracting force even from weak drive signals while maintaining adequate bonding strength at the discrete bonding locations.
3Stability of the object's composition
If bonding members are formed between all films, then the films are bonded to each other, but the bonding process becomes complex and requires more bonding members
Solution Approach 1:
The bonding members are extracted from being present between all films to only essential locations (near both end portions of the films). This extraction simplifies the bonding process and reduces the number of bonding members required while still providing sufficient bonding strength to prevent peeling during stretch and contraction.
4Stability of the object's composition
If adhesive layers are used to bond piezoelectric films, then the films are bonded to each other, but the adhesive layers cause peeling of bonding members during stretch and contraction
Solution Approach 1:
The discrete segmented bonding members allow the films to stretch and contract between bonding locations without creating excessive stress on the bonding members themselves. This segmentation prevents the peeling that occurs with continuous adhesive layers while maintaining bonding strength at the discrete locations.
Solution Approach 2:
Positioning bonding members locally at critical areas (near both end portions) provides bonding strength where it is most needed to prevent peeling, while allowing other areas to remain unbonded and free to move. This local quality approach enhances reliability by preventing peeling at the most critical locations.
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 allows for a strong stretching and contracting force from a weak drive signal, preventing electrode peeling and heat generation, while maintaining even thickness and reducing the need for extensive bonding processes, thus enhancing the piezoelectric element's performance.
Implementation Method 1
piezoelectric element is formed by laminating piezoelectric films sandwiched by electrodes... This piezoelectric element can be bent upward or downward by distributing electricity to the electrodes and applying a voltage to the piezoelectric films
Data Source
AI summary
A piezoelectric element that includes a plurality of laminated piezoelectric films and adhesive layers. The piezoelectric films stretch and contract in a predetermined direction parallel to principal surfaces thereof when a voltage is applied thereto. The adhesive layers are formed partially between the piezoelectric films when seen from a plan view, are aligned at intervals in the predetermined direction of the stretching and contracting of the piezoelectric films and bond the piezoelectric films to each other. The adhesive layers are formed at both ends of the piezoelectric films in the predetermined direction.