Earphone Speaker Unit FPCB Axial Layout
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Solution Overview
Problem
The size of the diaphragm in earphone speaker units is limited due to the space occupied by the substrate and reinforcing plate, restricting the intensity and reproduction range of sound, especially in high and low frequency ranges.
Innovation Solution
A speaker unit design that includes a frame, magnet, diaphragms, and a flexible printed circuit board (FPCB) with separate regions for coil connections, allowing for increased diaphragm size by optimizing the placement and structure of the FPCB and terminal connections to enhance sound intensity and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the substrate width is increased to accommodate more pads for high and low frequency speaker units, then the number of pads and their attachment area are improved, but the diaphragm size is reduced due to space occupation in the radial direction
Solution Approach 1:
The FPCB is designed to extend in the axial direction (front-to-rear direction) rather than requiring increased radial width. By positioning contact points at different axial locations, the substrate can accommodate multiple speaker units while maintaining a compact radial footprint, thus preserving diaphragm area.
Solution Approach 2:
The FPCB is divided into multiple regions with contact points distributed along the axial direction. This segmentation allows the substrate to serve multiple speaker units (high frequency and low frequency) at different axial positions without requiring a wider radial dimension, resolving the space conflict.
2Area of moving object
If the diaphragm size is increased to improve sound intensity and reproduction range, then the sound quality is improved, but the space for substrate and reinforcing plate in the radial direction is reduced
Solution Approach 1:
The substrate (FPCB) is configured to extend primarily in the axial direction rather than the radial direction. This allows the diaphragm to maintain a larger radial area for improved sound quality, while the substrate accommodates multiple contact points along the axial length to support multiple speaker units.
3Area of stationary object
If the radial width is increased to accommodate larger substrate and reinforcing plate, then the substrate support area is improved, but the diaphragm size and sound reproduction capability are limited
Solution Approach 1:
The FPCB extends in the axial direction to provide sufficient substrate area for supporting multiple speaker units, while maintaining a compact radial width that allows larger diaphragm area. This dimensional reorientation preserves both substrate support capability and sound reproduction performance.
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 increases the intensity and reproduction range of sound by securing the size of the diaphragm, enabling better performance in both high and low frequency ranges without compromising the radial width, thus improving overall sound quality.
Implementation Method 1
a speaker unit that generates sound waves... including a frame, a diaphragm, and a coil and a substrate which are fixed to the diaphragm
Data Source
AI summary
A speaker unit for an earphone may include a frame; a magnet; a first plate fixed to the frame and in contact with one side of the magnet; a second plate fixed to the frame and in contact with the other side of the magnet; a first coil and a second coil that are disposed to overlap the magnet and the plate in a radial direction; a first diaphragm disposed in front of the magnet and having the first coil fixed thereto; a second diaphragm disposed behind the magnet; and a flexible printed circuit board (FPCB), wherein the FPCB includes a first region including a first contact point connected to the first coil and a second region including a second contact point connected to the second coil and in a front-to-rear direction, the first region is disposed to overlap the first diaphragm in a front-to-rear direction.