Speaker Module Induction Coil Design for Down-lead Reliability
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Solution Overview
Problem
Existing speaker modules with a movable voice coil require two down-leads for electrical connectivity, leading to structural constraints, vulnerability to breakage, and polarization issues that affect performance.
Innovation Solution
A speaker module design featuring a magnetic circuit system with induction coils and a circuit board configuration that eliminates the need for traditional voice coil down-leads, allowing for a larger magnetic circuit and improved vibration characteristics, using induction coils to transmit electrical signals and maintain connectivity without the need for physical down-leads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two down-leads are used to connect the voice coil to the FPCB, then electrical connectivity is achieved, but the magnetic circuit system size is reduced
Solution Approach 1:
The patent extracts the down-leads from the traditional voice coil assembly and relocates them to the vibrating diaphragm structure. The down-leads are integrated into the diaphragm's support structure rather than being separate components, which eliminates the space occupation issue while maintaining electrical connectivity to the voice coil.
Solution Approach 2:
The patent changes the spatial arrangement by positioning the down-leads vertically through the vibrating diaphragm rather than horizontally across the magnetic circuit system. This dimensional reorganization allows the down-leads to pass through the diaphragm structure without occupying lateral space that would reduce the magnetic circuit system size.
2Reliability
If two down-leads are used to connect the voice coil, then electrical connectivity is achieved, but the down-leads are easily broken causing open circuit
Solution Approach 1:
The patent merges the down-leads with the vibrating diaphragm structure by integrating them into the diaphragm's support framework. This combination provides mechanical reinforcement to the down-leads, distributing the mechanical stress across the entire diaphragm structure rather than concentrating it on the fragile down-lead wires alone.
Solution Approach 2:
The vibrating diaphragm itself acts as a flexible protective structure that accommodates and protects the integrated down-leads. The diaphragm's flexibility allows it to deform during vibration while maintaining the structural integrity of the embedded down-leads, preventing breakage that would occur with rigid external connections.
3Reliability
If two down-leads are used to connect the voice coil, then electrical connectivity is achieved, but polarization occurs to the voice coil causing poor performance
Solution Approach 1:
The patent extracts the down-leads from the voice coil assembly and relocates them to the vibrating diaphragm structure. This separation removes the mechanical pulling force that the down-leads exert on the voice coil, eliminating the source of polarization while maintaining the necessary electrical connectivity through the diaphragm integration.
4Volume of stationary object
If the magnetic circuit system size is reduced due to down-leads, then space is occupied, but sensitivity and frequency response are improved with larger magnetic circuit
Solution Approach 1:
The patent reorganizes the spatial arrangement by positioning the down-leads vertically through the vibrating diaphragm rather than horizontally across the magnetic circuit system. This dimensional change allows the magnetic circuit system to expand in the lateral dimensions without being constrained by the down-leads, while the down-leads occupy only the vertical space through the diaphragm thickness.
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 enhances the magnetic circuit's size and sensitivity, reduces the risk of down-lead breakage, and prevents polarization, enabling improved sound generation and frequency response while simplifying assembly.
Implementation Method 1
the first induction coil can induce the changing magnetic field. In other words, when the magnetic flux passing through a closed circuit changes, a changing current will be generated and is conducted to the voice coil
Data Source
AI summary
A speaker module is disclosed, which comprises an inner cavity defined by a shell, and a magnetic circuit system and a vibrating system arranged inside the inner cavity, wherein the vibrating system comprises a vibrating diaphragm fixed in the inner cavity, a voice coil is fixed to a lower end of the vibrating diaphragm, a first induction coil is provided to an upper end of the vibrating diaphragm, the voice coil is electrically connected with the first induction coil via its down-lead, and a second induction coil is provided above the first induction coil for electrically connecting a terminal device. When the speaker module operates, the terminal device conducts a current signal of an external audio to the second induction coil, so that the second induction coil generates a magnetic field which changes along with the change of the audio signal current.