Multifunctional Sound Device with Shared Magnetic Circuit Damping
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Solution Overview
Problem
Existing multifunctional sound devices face challenges in miniaturization due to increased thickness, interference between sound unit and motor vibration systems, and inadequate damping, leading to poor acoustic and vibration performance.
Innovation Solution
A multifunctional sound device design where the sound unit and motor assembly share a magnetic circuit system, utilizing conductive mass blocks for electromagnetic damping and eliminating the need for separate magnets, with a structure that optimizes damping and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sound unit and motor assembly are independently controlled with separate magnetic circuits, then the vibration functions are independent and reliable, but the device thickness increases and miniaturization becomes difficult
Solution Approach 1:
The patent combines the sound unit and motor assembly into a single integrated structure where both functions share the same magnetic circuit system. The voice coil for sound generation and the driving coil for vibration are positioned within the same magnetic field generated by the magnetic circuit system, eliminating the need for separate magnetic circuits and reducing device thickness while maintaining functional independence through separate coil control.
Solution Approach 2:
The magnetic circuit system serves dual purposes: it generates the magnetic field necessary for sound generation by the voice coil and simultaneously provides the magnetic field for vibration actuation by the driving coil. This multi-functional design allows a single magnetic circuit to support both acoustic and vibration functions, reducing overall device size and thickness.
2Reliability
If separate magnets are used for sound unit and motor vibration system, then each function has dedicated magnetic field, but the number of magnets increases device volume and complicates assembly
Solution Approach 1:
The patent merges the magnetic field generation function into a single shared magnetic circuit system that serves both the sound unit and motor assembly. The magnetic circuit includes magnets arranged to create a magnetic field that encompasses both the voice coil and driving coil, eliminating the need for separate magnet sets and reducing overall device volume.
Solution Approach 2:
The shared magnetic circuit system provides a universal magnetic field that supports both acoustic generation and vibration actuation. By designing the magnetic circuit to generate a sufficiently large magnetic field range, the system can simultaneously drive both the voice coil for sound and the driving coil for vibration without requiring separate dedicated magnets for each function.
3Object-affected harmful factors
If traditional foam damping components are used, then vibration damping is provided, but the damping effect is small, the volume is large, and the process is complex
Solution Approach 1:
The patent replaces the traditional mechanical foam damping system with an electromagnetic damping mechanism. The damping force is generated through electromagnetic interaction between the driving coil and the magnetic circuit system, eliminating the need for bulky foam components. This substitution provides stronger damping effects with smaller volume and simpler structure.
Solution Approach 2:
The patent changes the damping mechanism from mechanical (foam) to electromagnetic by utilizing the interaction between the driving coil current and the magnetic field. By adjusting electrical parameters such as coil resistance and current, the damping effect can be controlled and optimized, providing superior damping performance with compact dimensions compared to traditional foam-based mechanical damping.
4Ease of manufacture
If the driving coils and mass block are integrated, then assembly is simplified and manufacturing is easier, but the structure becomes more complex requiring precise positioning
Solution Approach 1:
The patent integrates the driving coils directly onto the mass block, forming a unified vibration unit. This integration simplifies assembly by reducing the number of separate components and connection points. The mass block serves as both the inertial element for vibration and the mounting substrate for the driving coils, streamlining the manufacturing process while the precise positioning is achieved through direct attachment rather than separate mounting operations.
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 design results in a compact, small-sized sound device with enhanced acoustic performance and vibration effectiveness, reducing costs and assembly complexity while facilitating miniaturization.
Implementation Method 1
The mass block cuts magnetic field lines of the magnetic circuit system in reciprocating vibration of the vibration unit and generates electromagnetic damping to prevent the vibration unit from vibrating
Implementation Method 2
The driving coils interact with the magnetic circuit system to enable the vibration unit to vibrate in a reciprocating mode after the driving coils are energized
Data Source
AI summary
A multifunctional sound device includes a housing, a sound unit, and a motor assembly. The sound unit includes a frame, a vibration system, and a magnetic circuit system. The motor assembly includes a vibration unit and elastic components. The vibration unit includes driving coils and a mass block. The driving coils are fixed to the mass block and located in a magnetic field range of the magnetic circuit system. The mass block is made of conductive materials. The driving coils interact with the magnetic circuit system to enable the vibration unit to vibrate in a reciprocating mode after the driving coils are energized. Compared with related art, the multifunctional sound device is small in overall thickness and size, large in electromagnetic damping of a magnetic circuit, easy to assemble, and excellent in acoustic performance.