Dual-Resonance Speaker Structure for Higher-Frequency Efficiency
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Solution Overview
Problem
Existing speakers, particularly micro speakers in mobile devices, face challenges in reducing power consumption and improving efficiency, especially at higher frequencies, due to limitations in frequency response and resonance frequencies.
Innovation Solution
Incorporating a second resonance frequency by connecting voice coils with a second compliance, and using phase-shifted coil signals to enhance frequency response, while reducing power consumption at higher frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single resonance frequency is used in the speaker design, then the structure is simple, but the frequency response is limited and power consumption is high at higher frequencies
Solution Approach 1:
The coil arrangement is segmented into multiple voice coils (first voice coil and second voice coil) that can be independently controlled. This segmentation allows the speaker to create multiple resonance frequencies, improving high-frequency response and reducing power consumption without requiring a completely new speaker structure.
Solution Approach 2:
The patent introduces dynamic control of multiple voice coils with different compliance values (c1 and c2), allowing the system to adapt its resonance characteristics. By dynamically adjusting which voice coils are active and their phase relationships, the speaker can optimize performance across different frequency ranges, reducing power consumption at higher frequencies.
2Reliability
If multiple voice coils are added to create a second resonance frequency, then the frequency response is improved, but the device complexity increases
Solution Approach 1:
The multiple voice coils serve dual functions: they can operate individually to create different resonance frequencies, and they can work together as a unified coil arrangement. The first and second voice coils can be selectively activated depending on the frequency requirements, making the system multi-functional without proportionally increasing complexity.
Solution Approach 2:
The second voice coil is positioned within or adjacent to the first voice coil, creating a nested or overlapping configuration. This spatial arrangement allows both coils to share part of the same magnetic field region and mechanical structure, reducing the overall space and material required compared to completely separate coil systems.
3Use of energy by moving object
If phase-shifted coil signals are used to enhance frequency response, then power consumption is reduced at higher frequencies, but the control system becomes more complex
Solution Approach 1:
The patent employs periodic phase shifting of coil signals, where the phase relationship between voice coils is systematically varied according to the input signal frequency. This periodic modulation allows the system to exploit resonance effects at different frequencies, improving efficiency without requiring continuous complex calculations or adaptive control.
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 speaker achieves improved frequency response with a peak at the second resonance frequency, reducing power consumption and enhancing overall efficiency, particularly in micro speakers used in mobile devices.
Implementation Method 1
An electrical sound input signal fed to the voice coil generates a force in the magnetic field of the magnet system and causes a movement between the coil arrangement and the magnet system
Implementation Method 2
the membrane together with the coil arrangement causes a first resonance frequency for an oscillation of the membrane in a direction parallel to the coil axis
Implementation Method 3
the second connector together with the voice coils of the coil arrangement causes a second resonance frequency for the oscillation of the membrane in a direction parallel to the coil axis and wherein the second resonance frequency is above the first resonance frequency
Data Source
AI summary
The invention relates to a speaker (1) comprising a coil arrangement (2) with at least two voice coils (3a, 3b), a magnet system (4) and a membrane (10) being fixed to the coil arrangement (2) and the magnet system (4). The membrane (10) has a first compliance (c1) and together with the coil arrangement (2) causes a first resonance frequency (fres1) for an oscillation of the membrane (10). In addition, the speaker (1) comprises a second connector (14, 17, 17a, 17b, 24, 25a, 25b) with a second compliance (c2), which interconnects the voice coils (3a, 3b). The second connector (14, 17, 17a, 17b, 24, 25a, 25b) together with the voice coils (3a, 3b) causes a higher second resonance frequency (fres2) for the oscillation of the membrane (10). Moreover, the invention relates to an electronic sound signal circuit (18), which is designed to output coil signals (SO1, SO2) having a frequency dependent phase shift (φ). In addition, invention relates to a sound system comprising an electronic sound signal circuit and a speaker of the above kind and to a method for manufacturing a coil arrangement (2).