Micro Speaker Package Structure With Venting for Pressure Balance
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Solution Overview
Problem
Existing micro speakers using MEMS technique face challenges in scaling down size while maintaining performance and reliability, particularly in balancing pressure and reducing defects like leakage in the low frequency range.
Innovation Solution
A package structure for micro speakers featuring a substrate with a hollow chamber, a membrane with straight edges and vent holes, and a multi-layered coil embedded within the membrane, which includes a magnetic element to enhance vibration and pressure balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of micro speaker elements is scaled down using MEMS technique, then the size of electronic products can be reduced, but the performance and reliability (particularly pressure balance and leakage prevention) deteriorate
Solution Approach 1:
The membrane is segmented by introducing vent holes that divide the membrane into multiple regions. This segmentation allows independent pressure control in different zones, enabling better pressure balance across the membrane surface while maintaining the overall compact size of the micro speaker device
Solution Approach 2:
The vent holes are strategically positioned at specific locations on the membrane rather than uniformly distributed. This local quality approach places pressure balancing features exactly where needed to prevent leakage and maintain reliability, while minimizing the impact on the overall small form factor
2Strength
If the membrane stiffness is increased to improve structural integrity, then the reliability improves, but the sensitivity and sound pressure level deteriorate
Solution Approach 1:
The patent utilizes a thin film membrane structure with integrated vent holes that maintains structural integrity through its design rather than increased stiffness. The vent holes create pressure equalization zones that prevent stress concentration, allowing the membrane to remain thin and flexible for high sensitivity while maintaining reliability through pressure balance
Solution Approach 2:
The patent changes the physical parameters of the membrane by introducing vent holes with specific dimensions and positions. This modifies the pressure distribution parameters across the membrane, enabling the membrane to maintain low stiffness for high sensitivity while achieving reliable operation through improved pressure balance
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 achieves higher sound pressure levels, improved sensitivity, and increased reliability by balancing membrane pressures and reducing stiffness, thus enhancing user experience and performance.
Implementation Method 1
The coil is embedded in the membrane. In addition, the magnetic element is disposed in the hollow chamber.
Implementation Method 2
A vent hole is formed in and penetrates the membrane, and the vent hole is separated from the coil and communicates with the hollow chamber.
Data Source
AI summary
A package structure of a micro speaker is provided, and includes a substrate, a membrane, a coil, and a magnetic element. The substrate has a hollow chamber. The membrane is disposed on the substrate and covers the hollow chamber. The coil is embedded in the membrane. The magnetic element is disposed in the hollow chamber. A vent hole is formed in and penetrates the membrane, and the vent hole is separated from the coil and communicates with the hollow chamber.