Horizontal Voice Coil Layout for Acoustic Transducer Vibration Space
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Solution Overview
Problem
The increase in voice coil height due to thicker wire materials for high outputs in sound converters leads to a decrease in vibration space, compromising magnetic circuit efficiency and reliability, especially in high-output modes.
Innovation Solution
A sound converter design incorporating a damper with a conductive pattern, such as a flexible printed circuit board (FPCB), to manage the voice coil's leader wire and provide a sufficient vibration space without increasing the device's size, along with a laminated diaphragm for improved rigidity and reliability, using a lightweight aluminum alloy coil and optimizing the diaphragm's shape for enhanced low-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the voice coil wire diameter is increased to increase output, then the output is improved, but the overall height of the voice coil increases and the vibration space decreases
Solution Approach 1:
The patent repositions the voice coil from a conventional vertical arrangement to a horizontal arrangement along the lateral direction of the diaphragm. This dimensional change allows the voice coil to achieve sufficient vibration space without increasing the overall height, thereby resolving the contradiction between using thick wire for high output and maintaining adequate vibration space.
2Power
If the voice coil wire diameter is increased to increase output, then the output is improved, but the magnetic circuit space decreases and characteristics are degraded
Solution Approach 1:
By arranging the voice coil horizontally along the lateral direction rather than vertically, the patent redistributes the space requirements. This allows sufficient room for both the thick-wired voice coil and the magnetic circuit components, resolving the contradiction between achieving high output with thick wire and maintaining adequate magnetic circuit space.
3Weight of moving object
If lightweight aluminum alloy coil is used to improve mid frequency efficiency, then the weight is reduced and efficiency is improved, but the coil is often broken due to low strength
Solution Approach 1:
The patent employs a composite construction where the voice coil wire is coated with a protective layer. This composite structure combines the lightweight properties of aluminum alloy with the protective characteristics of the coating material, maintaining both the weight advantage and mechanical strength/reliability.
4Volume of moving object
If the diaphragm seating position is raised to accommodate higher voice coil position, then the vibration space is maintained, but the overall device size increases
Solution Approach 1:
The patent utilizes the lateral dimension of the diaphragm instead of the vertical height to position the voice coil. By placing the voice coil along the lateral direction where there is sufficient space, the patent maintains adequate vibration space without increasing the overall device height, thus resolving the contradiction between maintaining vibration space and controlling device size.
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 ensures efficient vibration space utilization, prevents biased vibrations, and improves sound pressure in low-frequency bands, enhancing overall sound characteristics while reducing material costs and assembly complexity.
Implementation Method 1
The speaker converts electrical energy into mechanical energy through a voice coil present in a void according to Fleming's left hand rule to thereby generate sound
Data Source
AI summary
The present invention relates to a sound converter, and, more particularly, to a sound converter which can solve a problem in that a vibration space decreases in the sound converter requiring high outputs, as the overall height of a voice coil increases.