External Terminal Tapered Joint Reduces Acoustic Noise
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Solution Overview
Problem
Electronic devices with external metal terminals experience acoustic noise during mounting on a circuit board due to electro-strictive vibrations caused by high-frequency voltage applied to ceramic layers, which are not effectively mitigated by existing designs.
Innovation Solution
The design incorporates an external terminal with a joint part having a width smaller than the terminal electrode connection part, along with a support part and groove structure, to reduce electro-strictive vibrations and prevent solder bridges, enhancing mechanical strength and acoustic noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the external terminal has a conventional design with uniform width, then the mechanical strength is sufficient, but acoustic noise occurs due to vibration transmission to the mounting surface
Solution Approach 1:
The external terminal is designed with non-uniform width along its length. Specifically, the width at the joint part (W1) is made smaller than the width at the terminal electrode connection part (W0), creating a tapered structure. This local variation in geometry allows the terminal to differentially transmit or isolate vibrations at different segments, reducing acoustic noise while maintaining overall mechanical strength through the broader connection areas at the electrodes and mounting surface.
2Object-affected harmful factors
If the joint part width is reduced to minimize vibration transmission, then acoustic noise is reduced, but mechanical strength may be compromised
Solution Approach 1:
The invention changes the geometric parameter (width) of the external terminal along its length. By defining specific width parameters W0 at the terminal electrode connection part and W1 at the joint part with W1 < W0, the design optimizes the balance between vibration transmission and mechanical strength. This parameter variation allows the terminal to act as a vibration isolator while maintaining structural integrity through the broader connection zones.
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 effectively reduces acoustic noise by minimizing vibration transmission to the mounting surface and prevents solder bridges, contributing to a more reliable and compact device with improved mechanical strength.
Implementation Method 1
acoustic noise is a phenomenon which a mounting board vibrates at frequency within an audible range, and audible noise occurs. It is considered that the vibration is caused by electro-strictive effect when a high frequency voltage is applied to ceramic layers constituting most of an element body and by a transmission thereof to the external terminal and/or mounting surface.
Data Source
AI summary
An external terminal 30 comprises a terminal electrode connection part 32 connected to the terminal electrode 22 to face to the end surface of the element body 26; a mounting connection part 34 connectable to a mounting surface 62; and a joint part 36 which joins the terminal electrode connection part 32 with the mounting connection part 34 to separate one side surface 26a of the element body 26 closest to the mounting surface 64 therefrom. A width W1 of the joint part 36 along a direction parallel to the mounting surface 62 is smaller than a width W0 of the terminal electrode connection part 32.