Two-Way Speaker With F-PCM Diaphragm for Fast High-Frequency Response
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Solution Overview
Problem
Existing two-way speakers face issues with magnetic flux leakage due to round sections in the yoke flange, requiring separate jigs for concentricity alignment, and suffer from slow response speeds in high-frequency sound reproduction due to heavy voice coils in dynamic structures.
Innovation Solution
A two-way speaker design incorporating a flexible-printed coil membrane (F-PCM) diaphragm as a tweeter speaker, which directly transfers magnetic field power to the diaphragm, reducing the vibrating system's weight and using a shared yoke with a dynamic speaker unit to simplify manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a dynamic structure with heavy voice coils is used for high-frequency sound reproduction, then power generation capability is improved, but response speed deteriorates due to increased weight
Solution Approach 1:
The patent extracts the coil structure from the traditional dynamic speaker configuration and repositions it on the diaphragm surface. This separation allows the diaphragm to be lighter while maintaining the electromagnetic interaction capability, thus improving response speed without sacrificing power generation capability
Solution Approach 2:
The patent employs a thin film diaphragm with surface-mounted coils instead of traditional heavy voice coils. This flexible film structure significantly reduces the moving mass while maintaining electromagnetic functionality, enabling faster response for high-frequency sound reproduction
2Ease of manufacture
If the yoke flange is formed by bending the yoke cylinder, then manufacturing simplicity is improved, but magnetic flux leakage increases due to round-shaped sections
Solution Approach 1:
The patent addresses the magnetic flux leakage issue by strategically positioning the F-PCM diaphragm with its coil pattern to compensate for flux leakage at the rounded yoke flange sections. The coil configuration is designed to reinforce the magnetic field in areas where leakage occurs, converting the structural limitation into a manageable parameter through electromagnetic compensation
3Manufacturing precision
If separate jigs are used to match concentricity of the small diaphragm and voice coil, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the diaphragm and coil into a single integrated F-PCM unit where the coil is directly formed on the diaphragm surface. This integration eliminates the need for separate alignment operations and multiple jigs, as concentricity is inherently achieved through the unified structure, thereby reducing device complexity while maintaining manufacturing precision
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 F-PCM diaphragm enables fast high-frequency sound reproduction with improved magnetic flux density and reduced weight, enhancing the speaker's performance and simplifying the manufacturing process by integrating both speaker units into a single unit.
Implementation Method 1
a second speaker unit disposed above the yoke and having a magnetic circuit and a flexible-printed coil membrane (F-PCM) diaphragm having a coil pattern formed on a polymer film
Implementation Method 2
which directly transfers magnetic field power to the diaphragm
Implementation Method 3
a first speaker unit disposed below the yoke and having a magnet, a top plate, a voice coil, and a diaphragm
Data Source
AI summary
A two-way speaker includes: a frame having a space for accommodating parts; a yoke partitioning the space of the frame vertically and having a lower surface and a side wall; a first speaker unit disposed below the yoke and having a magnet, a top plate, a voice coil, and a diaphragm; a protector disposed below the first speaker unit and protecting the diaphragm; a second speaker unit disposed above the yoke and having a magnetic circuit and a flexible-printed coil membrane (F-PCM) diaphragm having a coil pattern formed on a polymer film; and a sound emission yoke attached to an upper surface of the second speaker unit.