Ultrasonic Sensor Housing Segmentation for Resonance and Strength
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Solution Overview
Problem
Conventional ultrasonic sensing devices face reliability issues due to inadequate adhesion of piezoelectric sheets to the housing, material waste from imprecise encapsulant application, and a trade-off between structural strength and resonance characteristics, particularly when using metal or plastic housings.
Innovation Solution
The ultrasonic sensing device incorporates a metal connecting board, a plastic supporting shell, and a board with fixing members to securely attach the piezoelectric assembly, enhancing adhesion and resonance while maintaining structural integrity by using a metal board for durability and a plastic shell for better resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulant is injected to attach the piezoelectric sheet to the sensing surface, then the piezoelectric sheet can be attached, but the adhesive force is insufficient causing reliability issues
Solution Approach 1:
The housing is divided into a metal connecting board and a plastic supporting shell. The metal connecting board provides strong adhesion for the piezoelectric sheet, while the plastic supporting shell provides structural support. This segmentation allows each component to specialize in its optimal function, resolving the contradiction between adhesion strength and structural integrity.
Solution Approach 2:
The invention uses a composite structure combining metal and plastic materials in the housing. The metal connecting board offers superior adhesive properties for the piezoelectric sheet, while the plastic supporting shell provides mechanical strength and resonance characteristics. This composite approach resolves the contradiction by leveraging the complementary strengths of different materials.
2Reliability
If metal material is used for the housing, then resonance characteristics improve, but structural strength becomes insufficient
Solution Approach 1:
The housing is segmented into two functional parts: a metal connecting board for optimal resonance characteristics and a plastic supporting shell for structural strength. This segmentation allows the metal portion to excel in resonance while the plastic portion provides the necessary mechanical strength, resolving the contradiction between these two requirements.
Solution Approach 2:
Different parts of the housing have different material qualities optimized for their specific functions. The connecting board uses metal with superior acoustic properties for resonance, while the supporting shell uses plastic with high mechanical strength. This local differentiation of material properties resolves the contradiction by matching material characteristics to functional requirements.
3Strength
If plastic material is used for the housing, then structural strength improves, but resonance characteristics become insufficient
Solution Approach 1:
The housing is divided into a plastic supporting shell for structural strength and a metal connecting board for resonance characteristics. This segmentation allows the plastic portion to provide robust mechanical support while the metal portion delivers superior acoustic performance, resolving the contradiction between strength and resonance.
4Ease of manufacture
If encapsulant is injected into the housing, then the piezoelectric sheet can be attached, but it is difficult to control the amount causing material waste
Solution Approach 1:
The piezoelectric sheet is pre-attached to the metal connecting board before final assembly, allowing precise control of encapsulant application. This preliminary attachment step enables better material management and reduces waste compared to injecting encapsulant into the complete housing assembly.
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 improves the reliability and resonance characteristics of the ultrasonic sensing device, addressing the limitations of conventional technologies by ensuring a tighter attachment of the piezoelectric sheet and balancing structural strength and resonance requirements.
Implementation Method 1
a piezoelectric sheet placed in the housing
Implementation Method 2
the resonance effect between the housing and the piezoelectric sheet
Data Source
AI summary
An ultrasonic sensing device includes a housing, a piezoelectric assembly, a board and a plurality of fixing members. The housing includes a connecting board being a metal board and a supporting shell being a plastic member. The supporting shell includes a bottom wall opposite to a disposing opening of the connecting board and a surrounding side wall integrally surrounding and connecting to the bottom wall. The surrounding side wall encloses a portion of the connecting board. The piezoelectric assembly includes an encapsulating body and a piezoelectric sheet enclosed by the encapsulating body. The encapsulating body is disposed on the bottom wall and surrounded by the surrounding side wall. The piezoelectric sheet has a sensing surface exposed to the encapsulating body and facing the bottom wall. The fixing members fix the board on the connecting board, thereby pressing the sensing surface of the piezoelectric sheet to the bottom wall.