Acoustic Device Flexible Circuit Pad Positioning
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Solution Overview
Problem
In existing acoustic devices for mobile phones, the flexible circuit board pad connecting the voice coil lead wire is often located below the second vibrating diaphragm, causing noise and reducing the elastic arm's length, leading to potential breaking and compromised acoustic performance and reliability.
Innovation Solution
The flexible circuit board is fixed to a side of the voice coil away from the first vibrating diaphragm, with the pad located on the inner side of the voice coil, allowing longer elastic arms and avoiding noise, thus enhancing vibration and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pad of the flexible circuit board is located at corner R outside the voice coil (below the second vibrating diaphragm), then the electrical connection to the voice coil is achieved, but the pad is likely to hit the second vibrating diaphragm during vibration generating noise, and the elastic arm becomes shorter increasing breaking risk
Solution Approach 1:
The pad is repositioned from a corner location outside the voice coil to the inner side of the voice coil, changing its spatial dimension and location. This dimensional change allows the pad to be positioned within the voice coil's projection area, preventing collision with the second vibrating diaphragm while maintaining electrical connection functionality.
Solution Approach 2:
Instead of placing the pad outside the voice coil at corner R as in conventional designs, the invention inverts this arrangement by positioning the pad on the inner side of the voice coil. This inverted positioning strategy resolves the collision issue by placing the pad within the voice coil's boundary where it cannot be struck by the vibrating diaphragm.
2Reliability
If the pad is located at corner R outside the voice coil, then electrical connection is established, but the elastic arm of the flexible circuit board becomes shorter, increasing breaking risk during vibration
Solution Approach 1:
The pad position is changed from corner R outside the voice coil to the inner side of the voice coil. This spatial repositioning allows the flexible circuit board's elastic arm to extend further without being constrained by the pad's location, thereby increasing the elastic arm's length and reducing breaking risk during vibration.
3Reliability
If the pad occupies space of the elastic arm of the flexible circuit board, then electrical connection is achieved, but the elastic arm becomes shorter reducing vibration performance
Solution Approach 1:
The pad is repositioned to the inner side of the voice coil, changing its spatial location from occupying the elastic arm's space to being positioned within the voice coil's projection area. This dimensional change allows the elastic arm to maintain its full length and flexibility, improving vibration performance while preserving the electrical connection function.
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 configuration improves vibration stability, reduces noise, and increases the reliability of the acoustic device by preventing pad collisions and elongating the elastic arm, resulting in better acoustic performance and reliability.
Implementation Method 1
a voice coil (23) driving the first vibrating diaphragm (21) to vibrate and produce a sound
Implementation Method 2
an elastic arm (243) connecting the two fixing arms (241, 242)
Data Source
AI summary
The present disclosure provides an acoustic device, including a frame and a vibration system fixed to the frame, where the vibration system includes a first vibrating diaphragm fixed to the frame, a voice coil driving the first vibrating diaphragm to vibrate and produce a sound, a second vibrating diaphragm fixed to an end of the voice coil which is away from the first vibrating diaphragm, and a flexible circuit board, the flexible circuit board includes a first fixing arm and a second fixing arm that are respectively fixed to the frame and the voice coil, an elastic arm connecting the first fixing arm and the second fixing arm, and a pad respectively extending from two ends of the second fixing arm, the pad is located on an inner side of the voice coil. The acoustic device in the present disclosure has better reliability and acoustic performance.