Dual-Diaphragm Speaker Kernel for High-Frequency Response
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Solution Overview
Problem
Existing speaker modules in earphones using moving coil vibration systems suffer from large vibration mass, poor transient characteristics, and asymmetric electromagnetic driving forces, leading to significant peaks and valleys in high-frequency response, which degrade sound quality and limit high-frequency expansion.
Innovation Solution
A speaker module design featuring a dual-diaphragm assembly with a first and second diaphragm assembly driven by a magnetic circuit system, incorporating a planar voice coil and multiple magnetic portions to form spaced magnetic loops, reducing thickness and improving sound quality across different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a moving coil vibration system is used in the speaker module, then the structure is simple and cost-effective, but the vibration mass is large and transient characteristics are poor
Solution Approach 1:
The patent divides the single diaphragm into two separate diaphragms (first diaphragm and second diaphragm) that can vibrate independently. Each diaphragm has its own voice coil and magnetic circuit system, allowing them to function as separate vibration units. This segmentation reduces the effective vibration mass of each individual diaphragm compared to a single large diaphragm, improving transient characteristics while maintaining structural simplicity through modular design.
2Reliability
If a moving coil vibration system is used, then the structure is mature and reliable, but asymmetric distribution of electromagnetic driving force produces wag vibration and split vibration
Solution Approach 1:
The patent creates two separate magnetic circuit systems (first magnetic circuit system and second magnetic circuit system) that are symmetrically distributed around the central axis. Each system independently drives one diaphragm, eliminating the asymmetric electromagnetic forces that cause wag vibration in single-diaphragm designs. The symmetric arrangement ensures balanced force distribution, preventing split vibration while maintaining the reliability of mature moving coil technology.
Solution Approach 2:
The patent intentionally introduces asymmetric elements in the form of two diagonally opposite diaphragms rather than symmetrically opposite ones. This asymmetric configuration of the two diaphragms along diagonal axes helps cancel out wag vibrations through destructive interference, while the symmetric magnetic circuit systems prevent split vibration. This clever use of asymmetric positioning resolves the harmful vibrations while preserving technical maturity.
3Volume of stationary object
If a single diaphragm assembly is used, then the structure is compact, but high-frequency response has serious peaks and valleys
Solution Approach 1:
The patent divides the audio frequency range handling between two separate diaphragms, each optimized for different characteristics. The first diaphragm handles lower frequencies while the second diaphragm handles higher frequencies, including the ultra-high frequency range above 20kHz. This frequency division through segmentation eliminates the peaks and valleys in high-frequency response that occur in single-diaphragm designs, as each diaphragm operates in its optimal frequency range without interference.
Solution Approach 2:
The patent adds a dimensional aspect by utilizing the radial direction for the second voice coil (planar voice coil) in addition to the axial direction of the first voice coil. This multi-dimensional arrangement of the two diaphragms and their driving systems allows for better spatial distribution of sound waves, improving high-frequency response by reducing interference patterns that cause peaks and valleys, while maintaining a compact kernel structure.
4Ease of operation
If two diaphragm assemblies are added to improve sound quality, then high-frequency performance improves, but the thickness of the magnetic circuit system increases
Solution Approach 1:
The patent transitions from a single-axis (axial) magnetic circuit arrangement to a multi-axis arrangement by positioning the two magnetic circuit systems in diagonal opposite directions. The second voice coil is arranged in the radial direction rather than solely in the axial direction, allowing the magnetic circuit system to utilize three-dimensional space more efficiently. This dimensional change enables two diaphragms to be driven without proportionally increasing the axial thickness, as the magnetic paths extend in multiple directions from the central magnetic pole.
Solution Approach 2:
The patent nests the second magnetic circuit system within the space created by the first magnetic circuit system. The two magnetic circuits share common structural elements and are arranged concentrically around the central axis, with the second system utilizing the radial and diagonal space rather than requiring additional axial length. This nested arrangement allows dual-diaphragm functionality while minimizing the overall thickness of the magnetic circuit system.
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 dual-diaphragm design enhances sound quality by reducing thickness, improving high-frequency performance, and minimizing interference between sound outputs, resulting in better sound reproduction across both low and high frequencies.
Implementation Method 1
the first voice coil cooperates with the first magnetic portion and the second magnetic portion to drive the first diaphragm assembly to vibrate
Implementation Method 2
the second voice coil cooperates with the second magnetic portion and the third magnetic portion to drive the second diaphragm assembly to vibrate
Implementation Method 3
the first voice coil cooperates with the first magnetic portion and the second magnetic portion to drive the first diaphragm assembly to vibrate
Data Source
AI summary
A kernel of a speaker module, a speaker module, and an earphone are provided and related to the field of electronic product technologies. The kernel includes a first diaphragm assembly, a first voice coil, a magnetic circuit system, a second diaphragm assembly, and a second voice coil. The magnetic circuit system includes a first magnetic portion, a second magnetic portion, and a third magnetic portion. The first magnetic portion surrounds a periphery of the second magnetic portion. The first voice coil cooperates with the first magnetic portion and the second magnetic portion to drive the first diaphragm assembly to vibrate. The second voice coil is fastened to the second diaphragm assembly, and the second diaphragm and the first diaphragm assembly are arranged on the magnetic circuit system. The second voice coil cooperates with the second magnetic portion to drive the second diaphragm assembly to vibrate.