Ferrite Core Centering Layer for Planar Magnetic Devices
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Solution Overview
Problem
Existing manufacturing processes for planar electronic devices with magnetic components often damage ferrite cores due to variability in their placement within the substrate, leading to inconsistent electric impedance and reduced performance.
Innovation Solution
A method involving the application of a non-conductive fluid polymer to form a centering layer on a planar substrate, which encapsulates a ferrite material body, preventing it from protruding and ensuring it is securely embedded between the substrate's sides, thus protecting it from damage during subsequent processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If planarization is performed on thermoset layers to achieve a flat surface, then surface flatness is improved, but ferrite cores may be mechanically damaged due to variability in their vertical positions
Solution Approach 1:
The patent applies a filler material to the lower side of the substrate before planarization to compensate for variability in ferrite core positions. This preliminary action ensures that even if cores are at different heights, the filler material fills the gaps and prevents mechanical damage during subsequent planarization, allowing the surface to be flattened without damaging the cores.
Solution Approach 2:
The filler material acts as a cushioning layer that protects the ferrite cores from mechanical stress during planarization. By placing this protective layer beforehand, the patent prevents direct contact between the planarization tools and the vulnerable ferrite cores, thereby maintaining their integrity while achieving the desired surface flatness.
2Stability of the object's composition
If ferrite cores are embedded in substrate holes to prevent protrusion, then mechanical stability is improved, but manufacturing complexity increases due to additional embedding steps
Solution Approach 1:
The patent introduces a filler material as an intermediary substance that simplifies the embedding process. Instead of requiring precise mechanical embedding of ferrite cores into holes, the filler material is applied to the lower side of the substrate and automatically fills the holes, providing stable positioning of the cores without complex embedding operations.
Solution Approach 2:
The patent changes the physical state of the filler material from liquid to solid through curing. This parameter change allows the filler material to transition from a flowable state that easily fills holes and positions cores to a solid state that provides mechanical stability, thereby achieving stable core positioning without complex manufacturing steps.
3Ease of manufacture
If variable vertical positions of ferrite cores are accommodated, then manufacturing flexibility is improved, but impedance consistency deteriorates due to asymmetric stress on cores
Solution Approach 1:
The patent applies filler material specifically to the lower side of the substrate where ferrite cores are located, providing localized compensation for position variability. This local quality approach ensures that each core receives adequate support and stress distribution based on its specific position, maintaining impedance consistency while accommodating manufacturing tolerances.
Solution Approach 2:
The filler material creates a homogeneous stress distribution across all ferrite cores regardless of their vertical positions. By filling gaps and providing uniform support to all cores, the patent ensures that asymmetric stress is eliminated, thereby maintaining consistent impedance characteristics across all magnetic components in the substrate.
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 approach ensures the ferrite core remains undamaged, maintaining consistent electric impedance and enhancing the mechanical stability and performance of the magnetic components by keeping them within the substrate's thickness during planarization and other processing operations.
Implementation Method 1
curing the fluid polymer to form a solid centering layer
Data Source
AI summary
A method for manufacturing a planar electronic device includes applying a non-conductive fluid polymer to a lower side of a planar substrate. The substrate includes a hole extending through the substrate. The method also includes curing the fluid polymer to form a solid centering layer on the lower side of the substrate, with the centering layer extending across the hole along the lower side of the substrate. The method further includes loading a ferrite material body into the hole of the substrate through the upper side of the substrate, embedding the ferrite material body in an encapsulating material in the hole, and forming one or more conductive loops around the ferrite material body. The ferrite material body is held within the substrate between the lower side and the upper side of the substrate by the encapsulating material.