Miniature Sounding Device Voice Coil Inner Diameter
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Solution Overview
Problem
The existing miniature sounding devices in mobile phones are limited by the stacked configuration of the dome, voice diaphragm, flexible circuit board, and voice coil, which restricts the inner diameter of the voice coil, affects acoustic performance, and increases the device's size, hindering miniaturization efforts.
Innovation Solution
The miniature sounding device features a magnetic circuit system with a yoke, magnet, and pole plate configuration that maximizes the voice coil's inner diameter by using a dome and voice diaphragm design, along with a flexible circuit board arrangement that reduces height and optimizes the voice coil's dimensions, allowing for improved acoustic performance and reduced overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the dome, voice diaphragm, flexible circuit board and voice coil are stacked from top to bottom, then the structure is simplified, but the inner diameter of the voice coil is restricted and acoustic performance deteriorates
Solution Approach 1:
The patent changes the stacking arrangement from vertical (top-to-bottom) to a planar layout where the voice coil is positioned radially around the dome and voice diaphragm assembly. This dimensional reorganization allows the voice coil to achieve a larger inner diameter without increasing the overall height, thereby improving acoustic performance while maintaining structural compactness.
2Ease of manufacture
If the dome, voice diaphragm, flexible circuit board and voice coil are stacked from top to bottom, then assembly is simplified, but the height increases and miniaturization is hindered
Solution Approach 1:
The patent redistributes components in a planar configuration rather than stacking them vertically. The voice coil wraps around the perimeter of the dome assembly, the flexible circuit board is positioned radially outward, and connections are made through side-ward routing rather than vertical stacking. This reduces the height direction dimension while maintaining assembly feasibility through modified connection paths.
3Manufacturing precision
If the voice coil inner diameter is increased for better acoustic performance, then acoustic performance improves, but the device size increases
Solution Approach 1:
The patent achieves a larger voice coil inner diameter by repositioning the voice coil in a radial arrangement around the dome, rather than stacking it vertically above or below. This allows the voice coil to utilize the circumferential space efficiently, increasing its inner diameter for improved acoustic performance without proportionally increasing the overall device volume, as the height is constrained by the planar layout.
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 configuration enhances acoustic performance and minimizes the device's size, enabling more compact and lightweight designs for mobile devices by maximizing the voice coil's inner diameter and reducing height, thus addressing the challenges of miniaturization.
Implementation Method 1
a magnetic circuit system 12 which is accommodated in the frame 11, the vibrating system 5 is driven to vibrate and sound by the magnetic circuit system 12
Data Source
AI summary
The present disclosure provides a miniature sounding device, the miniature sounding device includes a fixing system; and a vibrating system including a diaphragm, a voice coil which is arranged underneath the diaphragm and is configured to drive the diaphragm to vibrate and sound, and a flexible circuit board arranged at an external side of the voice coil, the voice coil including a first end surface which is connected with the diaphragm and a second end surface which is opposite to the first end surface, the flexible circuit board is level with the first end surface. In the miniature sounding device provided by the present disclosure, the arrangement that the flexible circuit board is level with the voice coil can save height space.