NFC Coil Cover Shielding Metal Interference
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Solution Overview
Problem
Conventional near field communication devices experience a significant reduction in receiving sensitivity when mounted inside electronic apparatuses with metal components, leading to large changes in impedance and magnetic field strength.
Innovation Solution
A near field communication device configuration featuring a substrate with a coil element wound around a core, where at least a part of the coil is covered by a cover opposite to the substrate, which is fixed directly or indirectly to the substrate, preventing impedance changes and magnetic field strength reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the near field communication device is mounted inside a main body case with metal components, then the device can be integrated into electronic apparatuses, but receiving sensitivity is reduced due to large changes in impedance and magnetic field strength
Solution Approach 1:
A cover made of magnetic shielding material is introduced as an intermediary component between the coil element and the metal main body case. This cover mediates the interaction by shielding the magnetic field from the metal components, preventing the harmful effects of impedance changes and magnetic field strength reductions while allowing the device to be mounted inside the main body case
Solution Approach 2:
The patent changes the physical and magnetic parameters of the environment surrounding the coil element by introducing a cover with specific magnetic shielding properties. This alters the magnetic field distribution and impedance characteristics, maintaining stable receiving sensitivity despite the presence of metal components in the main body case
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 the reduction in receiving sensitivity, even when the device is mounted near metal structures, ensuring stable communication performance.
Implementation Method 1
a coil element (27) mounted on a surface of the substrate (26). The coil element (27) includes a core (28) and a coil (29) wound around an outer periphery of the core (28)
Data Source
AI summary
Near field communication device has a configuration in which at least a part of coil of coil element is covered with cover at a portion opposite to substrate and a part of cover is fixed to substrate directly or indirectly. Therefore, even when near field communication device is mounted to one of various electronic apparatuses in a vicinity of display unit outer peripheral frame made of metal, a large change in impedance or a large reduction in magnetic field strength can be prevented. As a result, a reduction in receiving sensitivity can be suppressed.