3D Flexible PCB Elastic Arm Layout for Sound-Producing Units
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Solution Overview
Problem
The extension from the dome of the diaphragm in existing sound-producing units occupies space in the magnetic circuit system, leading to wasted length of the elastic arm of the flexible printed circuit board and reduced sensitivity.
Innovation Solution
A sound-producing unit with a flexible printed circuit board featuring first and second elastic arms extending in non-parallel directions, positioned on different planes, and connected via arc-shaped transitions, maximizing elastic support and vibration sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planar flexible printed circuit board is used with an extension from the dome of the diaphragm, then the electrical connection to the voice coil is achieved, but the extension occupies space in the magnetic circuit system and wastes the elastic arm length
Solution Approach 1:
The flexible printed circuit board is transformed from a planar two-dimensional structure to a three-dimensional folded structure. The circuit board includes a first elastic arm extending in a first direction and a second elastic arm extending in a second direction not parallel to the first direction, creating spatial utilization that maximizes elastic arm length while avoiding occupation of magnetic circuit space.
2Area of stationary object
If the flexible printed circuit board extension is shortened to avoid occupying magnetic circuit space, then space utilization is improved, but the vibration sensitivity of the sound-producing unit is reduced
Solution Approach 1:
By folding the flexible printed circuit board into a three-dimensional configuration with elastic arms extending in non-parallel directions, the design maximizes the elastic arm length within the available space. This spatial optimization ensures that the elastic arms can fully utilize their length for vibration transmission without occupying magnetic circuit space, thereby maintaining high vibration sensitivity.
Solution Approach 2:
The flexible printed circuit board incorporates arc-shaped transitions at the bending portions, creating a curved three-dimensional structure. This curved configuration allows the elastic arms to extend in optimal directions while maintaining flexibility and vibration transmission efficiency, preventing collisions with the magnetic circuit system.
3Measurement precision
If the elastic arm is made longer to improve vibration sensitivity, then sensitivity is enhanced, but the risk of collision with the magnetic circuit system increases
Solution Approach 1:
The flexible printed circuit board is configured in three dimensions with elastic arms extending in non-parallel directions, allowing the arms to reach further without increasing the risk of collision. The spatial arrangement ensures that the elastic arms move in trajectories that avoid the magnetic circuit system while maximizing their effective length for vibration transmission.
Solution Approach 2:
The arc-shaped transitions at the bending portions create a curved three-dimensional path for the elastic arms. This curved configuration allows the arms to extend longer while following trajectories that avoid collisions with the magnetic circuit system, optimizing both sensitivity and safety.
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
Enhances the vibration sensitivity and service life of the sound-producing unit by optimizing the elastic arm configuration, ensuring stable electrical connections and preventing collisions with the magnetic circuit.
Implementation Method 1
a voice coil configured to drive the diaphragm to vibrate and produce sound
Implementation Method 2
a first elastic arm extending from the first fixing portion along a first direction, a second elastic arm extending from the first elastic arm along a second direction not parallel to the first direction
Data Source
AI summary
The present disclosure provides a sound-producing unit having a flexible printed circuit board that includes a first fixing portion, a first elastic arm extending from the first fixing portion along a first direction, a second elastic arm extending from the first elastic arm along a second direction, and a second fixing portion connected to the second elastic arm. By providing two elastic arms extending in different directions, the first fixing portion and the second fixing portion are positioned on two different planes, which fully utilizes the length of the elastic arms of the flexible printed circuit board. The elastic arms have a three-dimensional structure, which maximizes the elastic support force of the flexible printed circuit board, enhances the vibration sensitivity of the sound-producing unit, and buffers the pressure on the elastic arms, thereby improving the service life of the flexible printed circuit board.