Layered EMI Shielding Sheet With Absorbing Adhesive for Reflection Control
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Solution Overview
Problem
Existing electronic devices face interference from electromagnetic waves and magnetic fields due to shielding reflections, which affect internal components and users, particularly in high-performance portable devices with integrated components.
Innovation Solution
An electromagnetic wave- and magnetic field-absorbing-and-shielding sheet comprising multiple magnetic layers with an electromagnetic wave-absorbing adhesive member between them to absorb reflected waves and fields, and optionally featuring eddy current reduction patterns to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic layers are used to shield electromagnetic waves and magnetic fields, then shielding effectiveness is improved, but reflected electromagnetic waves cause interference with internal components
Solution Approach 1:
The patent applies the principle of converting harm into benefit by placing an electromagnetic wave absorber between the magnetic layers. The reflected electromagnetic waves, which would normally cause interference, are instead absorbed and converted into thermal energy through hysteresis loss and eddy current loss in the magnetic material. This transforms the harmful reflected waves into a beneficial heat dissipation mechanism while eliminating the interference problem.
Solution Approach 2:
The patent uses composite materials by combining magnetic layers with electromagnetic wave-absorbing material. The magnetic layers provide shielding against electromagnetic waves and magnetic fields, while the absorber material (such as ferrite, iron powder, or carbon-based materials) provides electromagnetic wave absorption. This composite structure achieves both shielding effectiveness and interference reduction simultaneously.
2Volume of moving object
If electronic components are highly integrated to make devices compact, then device miniaturization is improved, but interference from reflected electromagnetic waves increases
Solution Approach 1:
The patent introduces an intermediary substance - the electromagnetic wave absorber - placed between the magnetic layers. This intermediary absorbs the reflected electromagnetic waves before they can reach and interfere with the highly integrated electronic components. The absorber acts as a mediator that protects the compact internal components from the harmful effects of reflected waves, enabling both miniaturization and interference reduction.
3Adaptability or versatility
If magnetic materials are added to devices for various functions, then device functionality is improved, but magnetic field interference with adjacent components increases
Solution Approach 1:
The patent converts the harmful magnetic field interference into a beneficial effect by using the same magnetic materials that generate the interference. The magnetic layers, which create magnetic fields for device functionality, also serve to shield and absorb electromagnetic waves. The electromagnetic wave absorber further converts any remaining magnetic field energy into thermal energy through hysteresis loss, thereby reducing interference with adjacent components while maintaining device functionality.
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 sheet effectively absorbs reflected electromagnetic waves and magnetic fields, reducing interference with electronic components and users, enhancing device performance and safety.
Implementation Method 1
an electromagnetic wave-absorbing adhesive member, which is arranged between the adjacent magnetic layers so as to absorb electromagnetic waves that have transmitted the magnetic layers or are reflected from the magnetic layers
Implementation Method 2
an electromagnetic wave-absorbing adhesive member, which is arranged between the adjacent magnetic layers so as to absorb electromagnetic waves
Implementation Method 3
a plurality of magnetic layers stacked to shield electromagnetic waves and magnetic fields
Implementation Method 4
a soft magnetic alloy ribbon sheet with at least one eddy current reduction pattern part formed
Implementation Method 5
an electromagnetic wave-absorbing adhesive member, which is arranged between the adjacent magnetic layers so as to absorb electromagnetic waves and fixes the adjacent magnetic layers
Data Source
AI summary
An electromagnetic wave- and magnetic field-absorbing-and-shielding sheet according to an exemplary embodiment of the present invention is implemented by comprising: an electromagnetic wave- and magnetic field-absorbing-and-shielding unit having a plurality of magnetic layers stacked to shield electromagnetic waves and magnetic fields; and an electromagnetic wave-absorbing adhesive member, which is arranged between the adjacent magnetic layers to absorb electromagnetic waves that have transmitted the magnetic layers or are reflected from the magnetic layers, and fixes the adjacent magnetic layers. Accordingly, together with an electromagnetic wave- and magnetic field-shielding function, the present invention has a function of enabling most of the electromagnetic waves reflected during shielding to be absorbed to minimize influence on surrounding electronic components, electronic devices, or a user of the electronic devices, caused by electromagnetic waves reflected during shielding and the magnetic field shielding, and thus can be widely applied to various electronic devices and the like.