MEMS Loudspeaker Shielding Wall for Acoustic Decoupling
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Solution Overview
Problem
Existing MEMS loudspeaker arrangements with opposing transducers suffer from sound wave interference, leading to reduced acoustic quality, making them unsuitable for loudspeaker applications.
Innovation Solution
A loudspeaker arrangement with a housing containing two MEMS loudspeakers and a shielding wall that acoustically decouples them, preventing sound wave interference by dividing the sound-conducting cavity into separate regions and guiding sound waves through a sound-conducting channel to the outlet opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two MEMS loudspeakers are arranged opposite one another with a common sound-conducting cavity, then production technology is simplified, but sound wave interference occurs which degrades acoustic quality
Solution Approach 1:
The common sound-conducting cavity is segmented into two separate cavity regions by the shielding wall, allowing each MEMS loudspeaker to have its own dedicated acoustic space while maintaining a compact housing design. This segmentation prevents sound wave interference between the oppositely arranged loudspeakers.
Solution Approach 2:
A shielding wall is introduced as an intermediary element between the two MEMS loudspeakers. This wall acts as an acoustic barrier that prevents sound waves from one loudspeaker from interfering with the other, while still allowing both loudspeakers to function within a shared housing structure.
2Reliability
If a shielding wall is introduced to acoustically decouple the MEMS loudspeakers, then acoustic quality is improved, but device complexity increases
Solution Approach 1:
The shielding wall is integrated into the housing structure, merging the acoustic separation function with the mechanical housing. This integration approach reduces the number of separate components and simplifies manufacturing while achieving the required acoustic decoupling.
Solution Approach 2:
The shielding wall serves multiple functions: it acts as an acoustic barrier to prevent sound wave interference, provides structural support within the housing, and helps define the boundaries of the two cavity regions. This multi-functionality reduces the need for additional specialized components.
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 sound quality by preventing interference between the MEMS loudspeakers, allowing for improved sound amplification and directionality while maintaining a cost-effective and space-efficient production process.
Implementation Method 1
The sound waves emanating from the MEMS loudspeakers hit the shielding wall and are reflected by it.
Implementation Method 2
The term "cavity" is to be understood as meaning a hollow space, by means of which the sound pressure of the MEMS loudspeakers can be amplified.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a loudspeaker arrangement (1) for a plurality of MEMS loudspeakers (5) for generating sound waves in the audible wavelength spectrum, comprising a housing (2), which has a sound conduction cavity (3) and at least one sound outlet opening (4), and at least two MEMS loudspeakers (5), arranged in the interior of the housing (2) opposite and spaced apart from each other by said sound conduction cavity (3), and each having a cavity (6) in the region of their opposite faces. The loudspeaker arrangement (1) according to the invention comprises a shielding wall (7) for acoustically decoupling the two MEMS loudspeakers (5) from each other, said shielding wall being arranged in the interior of the housing (2) between the two MEMS loudspeakers (5) such that the sound conduction cavity (3) is subdivided into a first and a second cavity region (8, 9) respectively associated with one of the two MEMS loudspeakers (5).