Coil Component Terminal Angle Design for Detachment Resistance
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Solution Overview
Problem
Existing coil components face issues with metal terminal detachment due to temperature-induced expansion and contraction, and insufficient joining between terminal and flange surfaces, leading to potential disconnection.
Innovation Solution
The coil component design features a metal terminal with a mounting portion and end surface portion angle θ smaller than the flange portion's projecting and end surface angle θ1, with the terminal joined only to the end surface of the flange, and optionally plated with nickel and tin for corrosion resistance and solderability, ensuring secure attachment and resistance to detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the metal terminal is joined to both the projecting surface and the end surface of the flange portion, then the joining strength is improved, but the effects of expansion and contraction of the mounting substrate caused by temperature changes are amplified, leading to potential detachment
Solution Approach 1:
The invention extracts the joining function from the projecting surface, making the metal terminal joined to only the end surface of the flange portion. This separation eliminates the harmful effect of temperature-induced expansion and contraction on the joining strength while maintaining adequate mechanical attachment through the end surface joining alone.
2Length of moving object
If the angle θ between the mounting portion and end surface portion of the metal terminal is larger than the angle θ1 between the projecting surface and end surface of the flange portion, then the mounting portion can extend further, but the end surface portion and end surface become separated, resulting in insufficient joining
Solution Approach 1:
The invention optimizes the angle parameter θ of the metal terminal by setting it smaller than the flange portion angle θ1. This parameter adjustment ensures that the end surface portion of the metal terminal remains in sufficient contact with the end surface of the flange portion, maintaining adequate joining strength while achieving the required mounting portion extension through proper geometric design.
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 effectively suppresses metal terminal detachment from the core, maintains secure joining despite temperature changes, and enhances solderability and corrosion resistance.
Implementation Method 1
the metal terminal may include an opposed surface opposed to the mounting substrate, the opposed surface may being covered with a nickel metal film and a tin metal film
Data Source
AI summary
A flange portion includes a projecting surface that is positioned in a leading end of a projection projecting toward a mounting substrate and that faces the mounting substrate, and a principal surface that extends in a direction crossing the projecting surface and that faces a direction in which the pair of flange portions are aligned. A metal terminal includes a mounting portion opposed to the projecting surface and an end surface portion opposed to the principal surface. An angle θ between the mounting portion and the end surface portion satisfies the relationship 85 degrees≤θ<90 degrees. The angle θ between the mounting portion and the end surface portion is smaller than an angle θ1 between the projecting surface and the principal surface.