Planar Voice Coil Speaker Layout for Compact High-Frequency Output
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Solution Overview
Problem
Traditional moving-coil speakers are bulky and face challenges in improving volume while maintaining high sound pressure level and bandwidth performance.
Innovation Solution
A speaker design featuring a planar voice coil and diaphragm, with a magnetic circuit system comprising multiple magnets and gaps, allowing for a compact form factor and enhanced high-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional moving-coil type speaker structure is used, then the speaker can achieve basic audio output function, but the speaker volume is large and difficult to miniaturize
Solution Approach 1:
The magnetic circuit system is divided into multiple independent magnets arranged in sequence with gaps between them, rather than using a single large magnet. This segmentation allows the voice coil to be positioned in the gaps, enabling a more compact overall structure while maintaining the necessary magnetic field strength for audio output function.
Solution Approach 2:
The voice coil is arranged in a planar configuration within the gaps between magnets, utilizing the spatial arrangement in a different dimension. This planar arrangement allows for a more compact volume compared to traditional three-dimensional magnetic field configurations, achieving miniaturization while preserving audio performance.
2Productivity
If traditional moving-coil type speaker structure is used, then the speaker can maintain structural simplicity, but the high-frequency performance and bandwidth are limited
Solution Approach 1:
The magnetic circuit system uses multiple magnets with specific gap arrangements to create localized magnetic field regions. The voice coil is positioned to interact with these localized fields, enhancing the magnetic field gradient in critical areas. This local optimization of magnetic field distribution improves high-frequency response and bandwidth while keeping the overall structure relatively simple.
Solution Approach 2:
The patent modifies the magnetic circuit parameters by introducing multiple magnets with controlled gaps between them, changing the magnetic field distribution parameters. This parameter change enables better high-frequency performance and expanded bandwidth without significantly increasing structural complexity, as the gaps and magnet arrangements can be optimized within existing design constraints.
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 design results in a smaller speaker with higher sound pressure level and improved bandwidth, suitable for applications like earphones, mobile phones, and notebook computers.
Implementation Method 1
a planar first voice coil capable of generating mechanical motion under the action of a magnetic field of the magnetic circuit system
Data Source
AI summary
The present application provides a speaker, which comprises a housing as well as a magnetic circuit system and a vibration system arranged the housing, the vibration system comprises a planar first voice coil which can generate mechanical motion under the action of a magnetic field of the magnetic circuit system, a planar first vibration diaphragm driven by the first voice coil, and the first voice coil is arranged on the first vibration diaphragm; the magnetic circuit system comprises a plurality of magnets, a gap is formed between the magnets, and at least a portion of the first voice coil corresponds to the gap between the magnets. The present speaker is different from a conventional moving-coil type speaker, and the speaker can be made smaller than a conventional moving-coil type speaker and with respect to high frequency performance, the speaker has higher sound pressure and a better bandwidth.