Sound-Generating Device With Shared Magnetic Circuit for Reduced Height
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Solution Overview
Problem
Existing sound-generating devices in mobile phones have a stacked motor vibration system that increases the overall height and cost due to the arrangement of components.
Innovation Solution
A multi-functional sound-generating device with a motor drive unit positioned on the peripheral side of the magnetic circuit system, sharing a single magnetic circuit system with the vibration system, and utilizing an elastic member to suspend the magnetic circuit system, reducing the overall height and cost while maintaining excellent acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor vibration system is stacked below the sound-generating unit, then the vibration function and sound-generation function can be integrated, but the overall height of the device increases
Solution Approach 1:
The patent merges the motor vibration system and sound-generating unit into a single integrated assembly where the motor drive unit is positioned within the same housing as the magnetic circuit system. The motor drive unit shares the magnetic circuit system with the vibration system, eliminating the need for separate stacked components and reducing the overall device height while maintaining both vibration and sound-generation functions.
Solution Approach 2:
The patent repositions the motor drive unit from a vertical stacked arrangement (below the sound-generating unit) to a horizontal peripheral arrangement around the magnetic circuit system. This dimensional change from vertical stacking to horizontal positioning allows the components to share space more efficiently, reducing the overall height of the device while maintaining functional integration.
2Adaptability or versatility
If the motor vibration system is stacked below the sound-generating unit, then the vibration function and sound-generation function can be integrated, but the cost increases
Solution Approach 1:
The patent combines the motor drive unit and magnetic circuit system into a shared assembly, where the magnetic circuit system serves dual purposes: supporting the vibration system and providing the magnetic field for the motor drive unit. This merging reduces the total number of components needed, simplifying manufacturing processes and reducing overall device cost while maintaining integrated vibration and sound-generation functions.
Solution Approach 2:
The magnetic circuit system is designed with multi-functionality, serving both as the magnetic field generator for the motor drive unit and as the structural support for the vibration system. This universal component design eliminates the need for separate dedicated parts, reducing part count, manufacturing complexity, and overall cost while achieving functional integration.
3Length of stationary object
If a single magnetic circuit system is shared by the vibration system and motor drive unit, then the device height and cost are reduced, but the structural complexity increases
Solution Approach 1:
The patent segments the magnetic circuit system into distinct functional zones: a first magnetic circuit system portion for the vibration system and a second magnetic circuit system portion for the motor drive unit. These segmented portions are integrated into a single unified structure, allowing clear functional differentiation and simplified manufacturing while maintaining the space-efficient shared design that reduces device height.
Solution Approach 2:
The motor drive unit is nested within the magnetic circuit system structure, with the motor drive unit positioned in the peripheral side of the magnetic circuit system. The elastic member suspends the magnetic circuit system from the housing, creating a nested arrangement where components are arranged concentrically or in nested positions, reducing overall height while managing structural complexity through organized spatial arrangement.
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 device achieves reduced height and cost while maintaining superior vibration effect and acoustic performance through the shared magnetic circuit system and strategic motor drive unit placement.
Implementation Method 1
The solenoid is sleevedly fixed to the iron core, and has a ring shape; the iron core is spacedly provided on the peripheral side of the magnetic circuit system
Implementation Method 2
The elastic member is fixed to the enclosure, and is configured to suspend the magnetic circuit system in the accommodating space
Implementation Method 3
the magnetic circuit system has a magnetic gap, and is configured to drive the vibration system to vibrate to produce sound
Data Source
AI summary
A multi-functional sound-generating device, including an enclosure with an accommodating space and a sound outlet, a sound-generating unit in the accommodating space and a motor assembly. The sound-generating unit includes a cone frame fixed to the enclosure, a vibration system and a magnetic circuit system fixed to the cone frame. The magnetic circuit system has a magnetic gap, and can drive the vibration system to vibrate. The motor assembly includes a motor drive unit at periphery of the magnetic circuit system and spaced from the vibration system, and an elastic member fixed to the enclosure and configured to suspend the magnetic circuit system in the accommodating space. The motor drive unit can drive the magnetic circuit system to vibrate, and includes an iron core fixed to the enclosure and spaced from the vibration system and a ring-shaped solenoid fixed to the iron core.