Shared Coil Balanced Armature Receiver Design
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Solution Overview
Problem
Existing receivers face issues with feedback and oscillation due to armature motion, and they are often too large and expensive for space-constrained applications, leading to user dissatisfaction.
Innovation Solution
A balanced armature receiver design using a single coil wound around a stationary magnetic core to drive two armatures, with a conventional magnetic design and optional U-shaped armatures to optimize space and reduce costs by eliminating redundant components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single coil is used to drive two armatures, then device size and cost are reduced, but the complexity of magnetic circuit design increases
Solution Approach 1:
The patent combines two armatures into a single receiver unit, sharing a common coil and magnetic core. This merging of components reduces the overall volume and eliminates redundant parts while maintaining the functionality of driving two armatures with one coil assembly.
Solution Approach 2:
The single coil assembly is designed to serve multiple functions by simultaneously driving two armatures. The magnetic core and coil structure is configured to generate magnetic fields that act on both armatures, making the single coil assembly a multi-functional component that replaces what would traditionally require separate coil assemblies for each armature.
2Object-generated harmful factors
If receivers are mounted back to back, then vibratory forces are canceled, but device complexity increases
Solution Approach 1:
The patent employs a back-to-back mounting configuration where two receiver assemblies are positioned with their armatures facing opposite directions. The vibratory forces generated by each armature act in opposing directions, creating a counterbalancing effect that cancels out harmful vibrations and reduces feedback and oscillation issues.
3Volume of moving object
If space is reduced in hearing instruments, then device portability improves, but receiver deployment becomes impractical
Solution Approach 1:
The patent integrates the coil and magnetic core components into a compact, nested arrangement where the coil is wound around the magnetic core, and both are housed within a minimized receiver assembly. This nested configuration allows the receiver components to be tightly packed, reducing the overall volume while maintaining functional integrity and enabling deployment in space-constrained hearing instruments.
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 design effectively cancels vibratory forces, reduces size, and lowers costs by utilizing a single coil, improving performance and usability in compact devices while minimizing feedback and oscillation.
Implementation Method 1
an electrical current creates a changing magnetic field in the receiver. The movement of the armature creates sound
Implementation Method 2
The motion of the armature causes a reactionary force in the receiver housing, which in turn causes motion of the device in which the receiver is mounted
Data Source
AI summary
An apparatus includes a coil; a stationary core, wherein the coil is wound about a portion the stationary core; a first magnetic structure and a second magnetic structure, wherein the first magnetic structure and the second magnetic structure are coupled to the stationary core; a first armature having a first end of the first armature and a second end of the first armature, wherein the first end of the first armature is coupled to the stationary core and the second end of the first armature is disposed within the first magnetic structure; and a second magnetic armature having a first end of the second armature and second end of the second armature, wherein the first end of the second armature is coupled to the stationary core and the second end of the second armature is disposed within the second magnetic structure.