Ultrasonic Element Partition Wall Adhesive Containment
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Solution Overview
Problem
In ultrasonic elements, the adhesive used to join the sealing plate and supporting film can flow and adhere to the piezoelectric element, altering its vibration characteristics and compromising acoustic performance.
Innovation Solution
The ultrasonic element design includes a partition wall section on the supporting film to contain the adhesive, preventing it from reaching the piezoelectric element, and optionally uses a bypass wire configured as part of the lower electrode coupling wires to further suppress adhesive flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive member is used to join the beam section and supporting film, then the sealing plate is securely fixed to the supporting film, but the adhesive may flow out and adhere to the piezoelectric element, changing its vibration characteristics
Solution Approach 1:
The patent introduces a wall section that divides the cavity into distinct regions: an adhesive application region where the adhesive member is disposed, and a piezoelectric element region where the piezoelectric element is mounted. This segmentation prevents the adhesive from flowing onto the piezoelectric element while maintaining the joining function, thus resolving the contradiction between joining strength and vibration characteristic stability
Solution Approach 2:
The wall section creates localized functional zones within the cavity. The adhesive application region has the property of allowing adhesive flow and bonding, while the piezoelectric element region maintains clean surfaces for optimal vibration. This local differentiation of functional properties ensures that the adhesive performs its joining function without compromising the piezoelectric element's vibration characteristics
2Manufacturing precision
If additional wall sections are added to prevent adhesive flow, then adhesive containment is improved, but device complexity increases
Solution Approach 1:
The wall section is integrated with the supporting film structure rather than being a separate, standalone component. By merging the wall section function into the existing supporting film, the design achieves effective adhesive containment without adding significant structural complexity or requiring additional manufacturing steps
Solution Approach 2:
The wall section serves multiple functions simultaneously: it acts as a barrier to contain adhesive, defines the cavity geometry, and provides structural support. This multi-functionality reduces the need for additional dedicated components, thereby maintaining device complexity at an acceptable level while achieving precise adhesive containment
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 design ensures consistent frequency characteristics of the ultrasonic transducers by preventing adhesive adherence to the piezoelectric elements, maintaining desired acoustic performance and facilitating manufacturing by eliminating the need for additional wall sections.
Implementation Method 1
a piezoelectric element provided on the supporting film and disposed in a region overlapping the opening section
Implementation Method 2
a sealing plate provided to be opposed to the fourth surface of the supporting film and joined to the supporting film by an adhesive member
Data Source
AI summary
An ultrasonic element includes an element substrate including a first surface, a second surface having a front-back relation with the first surface, an opening section piercing through the element substrate from the first surface to the second surface, and a partition wall section surrounding the opening section, a supporting film provided on the first surface of the element substrate to cover the opening section and including a third surface facing the opening section and a fourth surface having a front-back relation with the third surface, a piezoelectric element provided on the fourth surface of the supporting film and disposed in a region overlapping the opening section of the supporting film in a plan view from a film thickness direction extending from the third surface to the fourth surface, a sealing plate provided to be opposed to the fourth surface of the supporting film and joined to the supporting film by an adhesive member via a beam section projecting toward the supporting film, and a wall section provided on the fourth surface of the supporting film and provided to project toward the sealing plate between the beam section and the piezoelectric element.