Double Gap Double Coil Speaker for High-Volume Outdoor Alarms
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional speakers for outdoor safety alarms face challenges in achieving targeted sound volume within constrained physical sizes, particularly in spatially limited environments like vehicles, where they need to overcome environmental noise and penetrate obstacles effectively.
Innovation Solution
A double gap double coil driven speaker design featuring a magnetic flux loop with two gaps producing opposing magnetic fields to interact with two coils on a voice coil, which together push a diaphragm to enhance sound output without significantly increasing the speaker's physical size, and a U-shaped sound channel for extended sound propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional single coil speaker design is used, then the physical size can be kept compact, but the sound volume output is insufficient to overcome environmental noise
Solution Approach 1:
The voice coil is segmented into two separate coils (first coil and second coil) that are positioned in different gaps of the magnetic flux conducting device. Each coil independently contributes to the driving force on the diaphragm, allowing the sound volume output to be significantly enhanced while maintaining a compact overall structure through the shared magnetic flux loop.
Solution Approach 2:
The patent merges two coil systems into a single integrated speaker structure by sharing a common magnetic flux loop and diaphragm. The magnetic flux conducting device with two gaps allows both coils to operate simultaneously, combining their driving forces to achieve high sound volume output without proportionally increasing the physical size or structural complexity.
2Power
If the speaker physical size is increased to improve sound volume, then the sound output can be enhanced, but the speaker cannot be installed in spatially constrained environments like vehicles
Solution Approach 1:
The magnetic flux conducting device utilizes a three-dimensional magnetic flux loop structure with two gaps positioned at different spatial locations. This dimensional arrangement allows two coils to be accommodated within a compact volume, generating combined driving forces that produce high sound volume output without requiring a proportionally large physical size, enabling installation in spatially constrained environments.
3Productivity
If a single gap single coil design is used, then the structure is simple, but the sound propagation distance and obstacle penetration capability are limited
Solution Approach 1:
The magnetic flux conducting device is segmented into two distinct gaps within a unified magnetic flux loop, allowing two coils to be positioned at different locations. This segmentation enables the generation of two independent driving forces that contribute to enhanced sound propagation distance and obstacle penetration capability while maintaining structural efficiency.
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 nearly doubles the sound volume and prolongs sound propagation, effectively overcoming environmental noise and penetrating obstacles, while maintaining a compact size, thus achieving the desired output sound volume with improved low-frequency resonance.
Implementation Method 1
a permanent magnet (24), having a magnetization; a magnetic flux conducting device, having a magnetic flux conducting path, the magnetic flux conducting device and the permanent magnet (24) together forming a magnetic flux loop; wherein the magnetic flux loop has two gaps, and directions of magnetic fields generated in the two gaps are opposite to each other; a voice coil (22), having a voice coil former and two coils wound on an outer surface of the voice coil former, and the voice coil (22) having one end connected to the diaphragm (11); wherein the two coils are respectively accommodated in the two gaps; when the two coils conduct currents, the voice coil (22) is displaced to push the diaphragm (11)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A double gap double coil driven speaker (1) includes a diaphragm (11), a permanent magnet (24) having a magnetization, and a magnetic flux conducting device having a magnetic flux conducting path. The magnetic flux conducting device and the permanent magnet (24) together form a magnetic flux loop, wherein the magnetic flux loop has two gaps, and directions of magnetic fields generated in the two gaps are opposite to each other. The speaker (1) further includes a voice coil (22) having two coils wound on an outer surface of the voice coil (22) and the voice coil (22) having one end connected to the diaphragm (11), wherein the two coils are respectively accommodated in the two gaps. When the two coils conduct currents, the voice coil (22) is displaced to push the diaphragm (11), wherein, relative to a common cross section of the two gaps, the currents respectively flowing through the two coils are in opposite directions.