Transducer Bonding Surface Segmentation for Adhesive Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transducers face challenges in effectively bonding a lid to a substrate assembly without interfering with the oscillating cantilever, which can lead to sound leakage and compromised sound characteristics.
Innovation Solution
The transducer design incorporates a bonding surface with convex portions on the oscillating device and a lid with recessed areas, along with a slit structure that separates the oscillating unit from the frame, allowing for precise control of adhesive overflow and ensuring a gap between the oscillating unit and its surroundings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a lid is bonded to the substrate assembly using adhesive, then the bonding strength is improved, but the adhesive may overflow and interfere with the oscillating cantilever, degrading sound characteristics
Solution Approach 1:
The bonding surface is segmented into multiple regions: a first bonding surface area for the lid, a second bonding surface area for the frame, and a third bonding surface area for the oscillating unit. This segmentation allows adhesive to be applied in controlled zones, preventing overflow onto the cantilever while maintaining bonding strength.
Solution Approach 2:
Different surfaces are provided with distinct properties: the lid has a recessed portion at the bonding location to contain adhesive, the frame has a protrusion to control adhesive flow, and the oscillating unit surface is designed to repel or block adhesive. This local differentiation ensures adhesive stays in designated areas and does not interfere with the oscillating cantilever.
2Object-generated harmful factors
If the slit width between the oscillating unit and frame is reduced to improve sound characteristics, then the low sound domain characteristics are improved, but the manufacturing precision requirements increase
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the frame and oscillating unit. This adhesive layer fills and seals the slit gap, preventing sound leakage without requiring extremely tight mechanical tolerances. The adhesive acts as a compliant mediator that accommodates manufacturing variations while maintaining acoustic isolation.
3Reliability
If the bonding surface area is increased to improve bonding strength, then the bonding reliability is improved, but the risk of adhesive overflow onto the oscillating unit increases
Solution Approach 1:
The lid is designed with a recessed portion and the frame with a protrusion before bonding occurs. These pre-formed geometric features create physical barriers that contain the adhesive within specific boundaries during the bonding process. This preliminary structural preparation prevents adhesive overflow onto the oscillating unit while still providing sufficient bonding surface area for reliable attachment.
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 enhances sound characteristics by preventing adhesive interference with the cantilever, minimizing sound leakage, and allowing for a narrower slit width, thereby improving the low sound domain characteristics.
Implementation Method 1
a piezoelectric element formed on the oscillating membrane
Data Source
AI summary
The present disclosure provides a transducer. The transducer includes: a support substrate, having a first cavity; an oscillating device; and a lid, having a second cavity and bonded to the oscillating device by an adhesive. The oscillating device includes a first frame and an oscillating unit. A portion of the oscillating unit is connected to the first frame. When viewed from a connection direction of the oscillating device and the lid, the portion of the oscillating unit other than a connecting portion between the oscillating unit and the first frame is separated from the first frame by a slit penetrating the oscillating device along the connection direction. The lid has a second frame surrounding the second cavity and including a second bonding surface bonded to the first bonding surface by the adhesive. The first cavity and the second cavity are connected by the slit.