Hybrid Microspeaker Structure to Minimize Phase Distortion
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Solution Overview
Problem
Hybrid speakers suffer from distortion and heterogeneity due to phase differences between low-frequency and high-frequency speakers, which affect sound quality across the entire audible range.
Innovation Solution
A hybrid microspeaker design that integrates a dynamic low-frequency range speaker with a flexible printed circuit board (FPCB) high-frequency range speaker, using a combined magnetic circuit structure to minimize phase differences and enhance sound characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a dynamic speaker structure is used for low-frequency range, then magnetic field efficiency is improved, but acoustic characteristics in high-frequency range deteriorate due to heavy coil weight
Solution Approach 1:
The speaker system is segmented into two distinct frequency range speakers: a dynamic speaker for low-frequency range and an FPCB speaker for high-frequency range. Each speaker is optimized for its specific frequency range, allowing the dynamic speaker to maintain heavy coil construction for magnetic field efficiency while the FPCB speaker handles high-frequency requirements with lightweight construction.
Solution Approach 2:
The invention changes the structural parameters of the speaker system by combining two different speaker types with different construction characteristics. The dynamic speaker uses a heavy voice coil for low-frequency efficiency, while the FPCB speaker uses a lightweight flexible circuit board for high-frequency response, thereby optimizing parameters for each frequency range separately.
2Reliability
If FPCB speaker is used for high-frequency range, then weight of vibration meter is reduced and acoustic characteristics are improved, but reaction speed becomes slow due to indirect force transfer through voice coil
Solution Approach 1:
The system segments the frequency handling responsibilities, assigning high-frequency response to the FPCB speaker where direct electromagnetic force transfer to the diaphragm enables lightweight construction and improved acoustic characteristics, while low-frequency handling is assigned to the dynamic speaker.
3Ease of manufacture
If low-frequency speaker and high-frequency speaker are separated rather than configured as single unit, then manufacturing is simplified, but distortion and heterogeneity occur due to phase difference between speakers
Solution Approach 1:
The invention merges the low-frequency dynamic speaker and high-frequency FPCB speaker into a single integrated hybrid speaker unit. This combination ensures coordinated operation between the two speakers, eliminating phase differences and distortion that would occur if they operated as separate units, while maintaining manufacturing feasibility through modular assembly.
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 integrated design minimizes sound distortion and heterogeneity, improving both low-frequency and high-frequency sound characteristics by ensuring coherent operation of the speakers.
Implementation Method 1
a voice coil configured to vibrate by mutual electromagnetic force with the low-frequency range magnetic circuit
Implementation Method 2
a flexible printed circuit board (FPCB) seated on the bracket and including a pattern configured to vibrate by mutual electromagnetic force with the high-frequency range magnetic circuit
Data Source
AI summary
A hybrid microspeaker includes a low-frequency range speaker and a high-frequency range speaker. The low-frequency range speaker includes a frame, a low-frequency range magnetic circuit installed inside the frame, a voice coil configured to vibrate by mutual electromagnetic force with the low-frequency range magnetic circuit, and a diaphragm seated on the frame and configured to vibrate with the voice coil to generate sound. The high-frequency range speaker includes a bracket coupled to an upper portion of the frame, a high-frequency range magnetic circuit installed inside the bracket, and a flexible printed circuit board (FPCB) seated on the bracket and including a pattern configured to vibrate by mutual electromagnetic force with the high-frequency range magnetic circuit to generate sound.