Stylus Speaker Magnetic Circuit Layout for Leakage Control
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Solution Overview
Problem
The magnetic leakage in existing speaker devices used for styluses results in non-straight lines and non-linear strokes due to the structural arrangement of the magnetic circuit system, failing to meet the necessary magnetic leakage standards.
Innovation Solution
A speaker device design featuring a magnetic circuit system with flaps and side magnetic steels arranged to counteract magnetic field overflow, including a first and second splint with bent edges and additional side magnetic steels opposite in magnetization direction, forming a magnetic circuit to reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the magnetic circuit system uses a lower splint to fix the sounding driver to the frame, then the assembly is simple and easy to manufacture, but magnetic leakage occurs at the four corners of the lower splint causing non-linear strokes
Solution Approach 1:
The magnetic circuit system is divided into multiple independent magnetic steel units (first magnetic steel unit, second magnetic steel unit, third magnetic steel unit, fourth magnetic steel unit) with separate magnetic gaps. Each unit can be independently positioned and adjusted to control magnetic leakage paths, transforming the monolithic structure into a modular system that balances manufacturing ease with leakage control.
Solution Approach 2:
Different regions of the magnetic circuit system are designed with different characteristics. The magnetic steel units have varying thicknesses and positions (first, second, third, fourth magnetic steel units at different locations) to locally optimize magnetic flux distribution and reduce leakage at specific corners where it occurs most severely.
2Object-generated harmful factors
If the magnetic circuit system is designed with multiple magnetic steel units and flaps to reduce magnetic leakage, then magnetic leakage is reduced and linear strokes are achieved, but the device complexity increases
Solution Approach 1:
The flaps (first flap, second flap, third flap, fourth flap) serve multiple functions: they act as magnetic shields to redirect flux, structural connectors to join magnetic steel units to the frame, and alignment elements to position the voice coil correctly. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The magnetic steel units are nested within the frame structure, with each unit containing sub-components (voice coils, flaps, and connecting elements). The first magnetic steel unit contains the first voice coil and flaps, the second magnetic steel unit contains the second voice coil and flaps, and so on. This nesting allows compact integration of multiple functional elements into a unified structure.
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 redesigned magnetic circuit system effectively reduces magnetic leakage, ensuring compliance with stylus standards and preventing non-linear strokes.
Implementation Method 1
a voice coil, an outer periphery of which is fixed to the frame; and a permanent magnet configured to drive the diaphragm to vibrate
Implementation Method 2
a magnetic circuit system fixed to the frame, comprising: a first splint; a first magnetic steel unit fixed to the first splint
Data Source
AI summary
The present application provides a speaker device and a stylus, and the speaker device includes: a first frame, a first vibration system, a magnetic circuit system, a second frame, and a second vibration system. The magnetic circuit system includes a first splint, a first magnetic steel unit, a second splint, a center splint, and a second magnetic steel unit; at least part of an edge of the first splint is provided with a first flip bent and extended in a direction close to the second splint, and/or at least part of an edge of the second splint is provided with a second flip bent and extended in a direction close to the first splint. The magnetic circuit system further includes side magnets fixed to the first splint or the second splint. The speaker device reduces the magnetic leakage and avoids the occurrence of non-linear strokes of a stylus.