Coil Component With Dummy Terminals for Mounting Stability
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Solution Overview
Problem
Conventional coil components experience positional displacement in the horizontal and rotational directions when mounted on a mounting board due to being supported at only two points by their external terminals, leading to instability and potential interference with nearby electronic components.
Innovation Solution
A coil component design featuring a magnetic resin body on one surface with multiple terminals, including dummy terminals, to provide stable support at multiple points, reducing displacement and minimizing magnetic flux leakage while maintaining detection sensitivity by not covering the opposing surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coil component is supported at only two points by external terminals, then the structure is simple, but positional displacement occurs in horizontal and rotational directions during mounting
Solution Approach 1:
The support function is segmented from the external terminals to include dummy terminals. The dummy terminals are separate support points that do not carry electrical connection functions, dividing the support role from the electrical connection role. This allows multiple support points to be provided without adding complex electrical connection structures.
Solution Approach 2:
Dummy terminals act as intermediary support points between the external terminals and the mounting board. These dummy terminals provide additional support contact points that help stabilize the coil component's position during mounting without interfering with the electrical connection function of the external terminals.
2Object-generated harmful factors
If the magnetic resin body covers the entire first surface, then magnetic flux leakage is suppressed, but detection sensitivity may be reduced
Solution Approach 1:
The magnetic resin body is selectively applied only to the first surface of the coil conductor, leaving the second surface uncovered. This local differentiation allows the first surface to have magnetic flux suppression properties while the second surface maintains detection sensitivity. The magnetic resin body provides magnetic shielding where needed (first surface) without interfering with the detection function (second surface).
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 design enhances stability and reduces positional displacement, allows for closer placement of electronic components, and maintains detection sensitivity by distributing stress evenly across multiple terminals and controlling magnetic flux.
Implementation Method 1
the magnetic resin body can suppress a magnetic flux leakage from the first surface of the coil component
Implementation Method 2
a coil conductor formed into a spiral shape; a second surface that is a detecting surface and is a side facing a detected conductor
Data Source
AI summary
A coil component having a first surface and a second surface facing each other, including a coil conductor formed into a spiral shape, a magnetic resin body disposed on the first surface side of the coil conductor without being disposed on the second surface side of the coil conductor, a first external terminal and a second external terminal disposed on at least one surface on the first surface side of the magnetic resin body and electrically connected to the coil conductor, and at least one dummy terminal disposed on at least one surface on the first surface side of the magnetic resin body without being electrically connected to the coil conductor.