Miniaturized Receiver Housing with Localized Magnetic Permeability
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Solution Overview
Problem
Existing compact moving armature receivers face inefficiencies due to parasitic coupling, which reduces the effectiveness of magnetic flux in miniaturized designs, leading to reduced performance and efficiency.
Innovation Solution
The design optimizes magnetic flux paths by using magnetically permeable materials for the armature, diaphragm, and housing, while minimizing parasitic flux paths by employing non-permeable materials in specific housing portions and strategically reducing dimensional overlap, thereby enhancing active flux delivery to the air gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the receiver is miniaturized, then the compactness is improved, but parasitic coupling increases reducing magnetic flux effectiveness
Solution Approach 1:
The housing is designed with differentiated magnetic properties in different regions: magnetically permeable material in portions forming active flux paths (housing portions 32, 34) and magnetically non-permeable material in portions that would create parasitic paths (housing portion 36). This local differentiation allows the receiver to be miniaturized while maintaining effective magnetic flux delivery to the air gap by preventing parasitic coupling in critical regions.
2Power
If magnetically permeable materials are used throughout the housing, then magnetic flux delivery is improved, but parasitic flux paths are created reducing efficiency
Solution Approach 1:
The housing employs spatially varying magnetic permeability: magnetically permeable material is used in housing portions 32 and 34 that form active flux paths from the magnets through the air gap to the armature, while magnetically non-permeable material is used in housing portion 36 adjacent to the coil to prevent parasitic flux paths. This localized material selection optimizes both flux delivery and efficiency.
Solution Approach 2:
The housing is segmented into multiple portions (32, 34, 36) with different magnetic properties. Housing portions 32 and 34 are made of magnetically permeable material to conduct active flux, while housing portion 36 is made of magnetically non-permeable material to block parasitic flux paths. This segmentation allows simultaneous optimization of flux delivery and efficiency.
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 allows for the creation of highly efficient, miniaturized receivers with optimized flux paths, reducing parasitic losses and maintaining acoustic sealing, enabling effective sound pressure generation while maintaining a compact form factor.
Implementation Method 1
an armature is provided in the magnetic field of one or more magnets and thus is vibrated due to an electrical signal being introduced into a coil, the field of which affects the armature
Implementation Method 2
The housing has a first portion, 32, 34, made of a magnetically permeable material and a second portion, 36, made of a magnetically non-permeable material
Implementation Method 3
minimizing parasitic flux paths by employing non-permeable materials in specific housing portions
Data Source
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AI summary
A compact moving armature receiver where the diaphragm element is positioned in the air gap of the magnet assembly and where a suspension element is provided for defining the front chamber, the suspension element has a stiffness of at the most 500N/m. The suspension element and the diaphragm element may be made from the same sheet of a foil, and the suspension element may be formed by bent or curved peripheral parts of the foil.