Sound Generating Device With Air-Permeable Isolating Piece
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sound generating devices in portable electronic products face issues with pressure relief port blockages and liquid ingress due to their small size, leading to poor acoustic performance and reliability.
Innovation Solution
A sound generating device design featuring a membrane with a first through hole, a dome with a second through hole, and an air-permeable isolating piece that covers the second hole to form a leakage groove, allowing pressure relief while preventing external matter and liquid ingress, combined with a magnetic circuit system and damping parts for enhanced reliability and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small pressure relief port is used, then the device structure is compact, but external matters block the port and liquid enters the cavity
Solution Approach 1:
The air-permeable isolating piece acts as an intermediary component between the pressure relief port and the external environment. It allows air molecules to pass through for pressure equalization while blocking liquid and external matters, thus resolving the contradiction between maintaining a small port size and ensuring reliable pressure relief without contamination
Solution Approach 2:
The air-permeable isolating piece is made of porous material that permits gas permeation while preventing liquid penetration. This material property enables the pressure relief port to maintain small dimensions without sacrificing its pressure equalization function, while simultaneously providing protection against liquid ingress
2Object-affected harmful factors
If the pressure relief port is made larger, then liquid entry is prevented, but external matters may still block it and acoustic performance deteriorates
Solution Approach 1:
The air-permeable isolating piece serves as a mediator that provides liquid entry prevention without requiring an enlarged port. It maintains the small port dimensions necessary for acoustic performance while effectively blocking liquid through its porous structure that allows gas but not liquid passage
3Reliability
If the pressure relief port is covered to prevent blockage, then reliability improves, but air pressure balancing function is reduced
Solution Approach 1:
The air-permeable isolating piece made of porous material covers the pressure relief port while maintaining air pressure balancing efficiency. The porous structure allows sufficient gas permeation for pressure equalization while providing physical coverage that prevents external matter blockage and liquid entry, thus improving reliability without sacrificing the pressure balancing 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
The design ensures good waterproof performance, maintains sound vibration reliability, and significantly improves acoustic performance by preventing blockages and liquid entry, ensuring effective air pressure balance and sound emission.
Implementation Method 1
an air-permeable isolating piece, attached onto a side of the dome away from the vibrating part and completely covering the second through hole
Implementation Method 2
a magnetic circuit system for driving the vibration system to vibrate and generate sound
Implementation Method 3
a voice coil for driving the membrane to vibrate
Data Source
AI summary
The present disclosure provides a sound generating device, which includes a frame, a vibration system, and a magnetic circuit system. The vibration system includes a membrane, a dome, and an air-permeable isolating piece. The membrane is fixed to the frame and configured to define an inner sound generating cavity together with the frame and the magnetic circuit system. The vibrating membrane includes a vibrating part, a suspension, and a fixing part, the vibrating part defining a first through hole communicated with the inner sound generating cavity. The dome is attached to a side of the vibrating part, and the dome defines a second through hole communicating with the first through hole. The air-permeable isolating piece is attached to a side of the dome, and a side of the air-permeable isolating piece is sunken to form a leakage groove communicating with the second through hole.