FPCB Welding Portion Extraction for Sound Device Space Utilization
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Solution Overview
Problem
Conventional sound devices in mobile terminals face challenges in space utilization and welding complexity due to the internal location of the welding pad, which affects acoustic quality and manufacturing efficiency.
Innovation Solution
The sound device design includes a frame with a receiving space, a magnet system, and a vibration system, where the FPCB's second welding portion is fixed outside the receiving space, allowing for a connection to the outer circuit and simplifying the welding process, thereby improving space utilization and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the welding portion is located inside the frame, then the electrical connection is achieved, but the inner space of the sound device is occupied and the welding process is affected negatively
Solution Approach 1:
The welding portion is extracted from the internal space of the frame and positioned on the external surface. The FPCB is designed with a first welding portion connected to the coil and a second welding portion that extends outside the frame's receiving space, allowing welding operations to be performed externally without occupying internal volume or interfering with the assembly process.
2Ease of manufacture
If the welding portion is located inside the frame, then the electrical connection is achieved, but the space utilization rate is reduced
Solution Approach 1:
The FPCB is designed to extend in a direction that leads the welding portion outside the frame's receiving space. By utilizing the external surface dimension rather than confining the welding area to the internal volume, the design achieves electrical connection functionality while maximizing the usable internal space for other components.
3Reliability
If the welding portion is located inside the frame, then the electrical connection is achieved, but the welding process complexity increases
Solution Approach 1:
The welding portion is extracted from the constrained internal environment and positioned on the external surface of the frame. This allows welding operations to be performed in a more accessible location with better tool access and positioning, simplifying the welding process while maintaining reliable electrical connection between the FPCB and the sound device.
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
This design enhances space utilization and simplifies the welding process, leading to improved production yield and reliability of the sound device.
Implementation Method 1
a coil inserted in the magnetic gap drive the diaphragm
Implementation Method 2
a sound device is generally used for the playback of audio signal
Data Source
AI summary
The present disclosure discloses a sound device includes a frame having a receiving space, a vibration system and a magnet system having a magnetic gap; the vibration system includes a diaphragm and a coil; the magnet system includes a yoke and a magnet; the sound device further includes a FPCB connecting the coil with an outer circuit; the FPCB includes a first welding portion connecting with the coil, a second welding portion connecting with the outer circuit, and a connection portion connecting the first welding portion and the second welding portion, the second welding portion is fixed to the frame and located outside the receiving space. The sound device in the present disclosure has higher space utilization rate.