Adsorbent Skeleton for Loudspeaker Pressure Compensation
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Solution Overview
Problem
Conventional loudspeakers face inefficiencies due to back-to-front cancellation and impedance issues caused by gas in enclosures, which hinder bass performance and increase resonant frequency, making it challenging to produce compact speakers for mobile devices.
Innovation Solution
A pressure compensation apparatus with a skeleton member and adsorbent material is integrated within the loudspeaker unit, allowing for predictable adsorbency and reduced impedance by adsorbing and releasing gas molecules in response to diaphragm movement, thereby minimizing the need for large cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a loudspeaker is enclosed in an enclosure to reduce back-to-front cancellation, then the interfering sound waves are contained, but the gas within the enclosure increases impedance to diaphragm movement, reducing efficiency and bass performance
Solution Approach 1:
The patent employs a porous absorber material with specific flow resistance characteristics placed within the enclosure. This material allows gas molecules to be absorbed and released, compensating for pressure changes and reducing impedance to diaphragm movement while maintaining the enclosure's ability to contain interfering sound waves
Solution Approach 2:
The patent changes the physical parameters of the gas environment within the enclosure by introducing a porous material with specific flow resistance values. This modifies the gas dynamics to reduce impedance without sacrificing the enclosure's primary function of containing sound waves
2Use of energy by moving object
If the enclosure is enlarged to reduce the impedance of the air, then bass performance is improved, but the loudspeaker unit size increases
Solution Approach 1:
The porous absorber material with optimized flow resistance enables effective bass performance in smaller enclosures by actively managing gas pressure dynamics. The material's specific surface area and flow resistance characteristics allow it to compensate for pressure changes in compact volumes, achieving good bass response without requiring large cavity sizes
Solution Approach 2:
The patent modifies the gas dynamics parameters within the enclosure by introducing porous material with specific flow resistance characteristics. This enables smaller enclosure volumes to achieve the same bass performance that would traditionally require larger cavities
3Use of energy by moving object
If adsorbent material with high adsorbency is used to compensate for pressure changes, then impedance is reduced and efficiency is improved, but the material may have unpredictable adsorbency characteristics
Solution Approach 1:
The patent specifies particular parameter ranges for the porous material including flow resistance (10-1000 mmH2O/s), specific surface area (100-10000 m2/g), and pore size (1-100 nm). These controlled parameters ensure predictable adsorbency characteristics while maintaining high efficiency in pressure compensation
Solution Approach 2:
The use of porous materials with well-defined structural parameters (porosity, specific surface area, pore size distribution) provides predictable and reliable adsorbency. The specific flow resistance characteristic ensures consistent performance in pressure compensation without the unpredictability of other adsorbent materials
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 solution enhances loudspeaker efficiency, reduces the size of loudspeaker units, and improves bass performance while allowing for smaller, more compact designs suitable for mobile devices without the need for large speaker cavities.
Implementation Method 1
an adsorbent material having a regular structure supported on the skeleton member, wherein the apparatus is arranged for compensating for pressure changes
Data Source
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AI summary
Apparatus for an acoustic transducer system including a cavity having a substantially enclosed air volume. The apparatus comprising: at least one skeleton member wherein the skeleton member as a predetermined configuration comprising: a plurality of hollows formed within; and the at least one skeleton member has inner surfaces of the plurality of hollows provided with adsorbent material, wherein the apparatus is arranged for compensating for pressure changes within said substantially enclosed air volume of said cavity by adsorbing gas molecules when the pressure increases and by releasing gas molecules when the pressure decreases within said substantially enclosed air volume. The at least one skeleton member is substantially spheroidal in shape.