Injection-molding-type magnetic field shielding member and wireless power reception module comprising same
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Solution Overview
Problem
Conventional magnetic field shielding members made of sintered ferrite are prone to damage and deformation due to a protruding portion, leading to reduced charging efficiency and failure in quality certification.
Innovation Solution
An injection-molding-type magnetic field shielding member with a base part, first and second shielding parts, and an antenna accommodation part, made from ferrite powder or nano-grain alloy powder, which are integrally formed through injection molding, to prevent damage and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If accommodation grooves are formed in the shielding member to house the antennas, then the influence of permanent magnets is reduced, but the protruding portion becomes highly vulnerable to external impact
Solution Approach 1:
The patent merges the base part and the first shielding part into a single integrally formed structure through injection molding. This eliminates the separate accommodation groove that created the vulnerable protruding portion, while still providing the necessary shielding function against permanent magnet influence.
Solution Approach 2:
The patent changes the material parameter from sintered ferrite to injection-molded ferrite powder or nano-grain alloy powder. This material transformation allows the shielding member to maintain its magnetic shielding properties while achieving superior impact resistance and structural integrity.
2Reliability
If the shielding member is made of sintered ferrite, then magnetic shielding function is achieved, but deformation such as warping occurs during the sintering process
Solution Approach 1:
The patent changes the manufacturing process parameter from sintering to injection molding. This process substitution eliminates the warping and deformation issues associated with sintering, while still producing a functional magnetic shielding member using ferrite powder or nano-grain alloy powder.
Solution Approach 2:
The patent uses composite materials consisting of ferrite powder or nano-grain alloy powder combined with a binder resin. This composite approach enables injection molding processing while maintaining the necessary magnetic shielding properties, avoiding the deformation problems of traditional sintered ferrite.
3Volume of moving object
If the protruding portion has a very thin thickness of 3 mm or less, then the antenna accommodation is achieved, but the portion becomes vulnerable to impact and may fall off or separate
Solution Approach 1:
The patent merges the previously separate accommodation structure into the base part itself. The base part now directly provides the accommodation space for antennas without requiring a separate thin protruding shielding portion, thereby eliminating the vulnerability to impact while maintaining the necessary accommodation volume.
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 enhances the durability and performance of wireless power transmission and reception modules by preventing damage to the shielding member and maintaining alignment, thus passing quality certification.
Implementation Method 1
the base part and the first shielding part are integrally formed through injection molding using any one material of ferrite powder, sandust, or nano-grain alloy powder
Implementation Method 2
both the wireless power transmission module and the wireless power reception module are configured to arrange permanent magnets for alignment at the central part of their respective antennas. Accordingly, the wireless power transmission module and the wireless power reception module may maintain an aligned state with each other using the direct current magnetic field generated from the permanent magnets for alignment
Data Source
AI summary
An injection-molding-type magnetic field shielding member is provided. The injection-molding-type magnetic field shielding member according to one embodiment of the present invention comprises: a base part including an arrangement hole that penetrates the center so as to have a predetermined area; a ring-shaped first shielding part, which protrudes a predetermined height from the base part along the edge of the arrangement hole; and an antenna accommodation part which is defined by one surface of the first shielding part and one surface of the base part, and which is formed on the one surface of the base part in the circumferential direction of the first shielding part, wherein the base part and the first shielding part can be integrated through injection molding by using any one material from among ferrite powder, sandust, and nano-grain alloy powder.