Microspeaker Enclosure Air Adsorbent Low Frequency
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Solution Overview
Problem
Microspeakers with small sizes and slim shapes face a decrease in sound pressure level, particularly at low frequencies, due to reduced diaphragm area and resonance space, which existing technologies fail to adequately address by considering the space occupied by adsorbents in the resonance space.
Innovation Solution
A microspeaker enclosure with an air adsorbent that maintains an air adsorption mole ratio of 40.6 mol/m3·atm, optimizing the ratio of adsorbent volume to actual resonance space, and adjusting the effective diaphragm area and mechanical amplitude to enhance low-frequency sound pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size and shape of the microspeaker are reduced to facilitate portability, then the microspeaker becomes smaller and slimmer, but the sound pressure level particularly at low frequencies decreases
Solution Approach 1:
The patent applies porous adsorbent materials (such as zeolite, activated carbon, or silica gel) within the resonance space of the microspeaker enclosure. These porous materials adsorb air molecules, effectively reducing the volume of the resonance space and increasing the equivalent stiffness. This allows the microspeaker to maintain compact dimensions while improving low-frequency sound pressure level by enhancing the acoustic characteristics through the adsorbent's pore structure.
Solution Approach 2:
The patent changes the physical and chemical parameters of the resonance space by introducing adsorbent materials with specific properties (adsorption capacity, pore size, surface area). By selecting adsorbents with appropriate adsorption coefficients and optimizing their placement, the acoustic impedance and equivalent stiffness of the resonance space are modified, thereby improving low-frequency response without increasing the overall speaker size.
2Quantity of substance
If an air adsorbent is arranged in the resonance space to define a virtual acoustic space, then the low frequency sound pressure level is improved, but the actual resonance space decreases as much as the space occupied by the adsorbent
Solution Approach 1:
The patent utilizes porous adsorbent materials that occupy physical space within the resonance cavity but effectively reduce the acoustic volume even more through air molecule adsorption. The porous structure allows the material to adsorb significant amounts of air while maintaining a compact form factor, thus achieving dual benefits of space occupation and acoustic volume reduction.
Solution Approach 2:
The patent employs composite material structures combining the adsorbent material with the enclosure design. The adsorbent is integrated into the resonance space in a way that optimizes both the physical space occupation and the acoustic effect, creating a composite acoustic system where the adsorbent and enclosure work together to enhance low-frequency response.
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
Substantially improves sound pressure levels in the low-frequency range by considering the air adsorption rate and equivalent stiffness, ensuring the air adsorbent enhances low-frequency sound without reducing the actual resonance space.
Implementation Method 1
arranging an air adsorbent in a resonance space, so that the air adsorbent adsorbs air molecules and defines a virtual acoustic space
Data Source
AI summary
The present invention aims to provide a microspeaker with enhanced low frequency characteristics, by arranging an adsorbent for adsorbing the air in a resonance space and defining a virtual back volume by the air adsorption of the adsorbent. According to an aspect of the present invention, there is provided a microspeaker enclosure with an air adsorbent, including a microspeaker, an enclosure with the microspeaker provided therein, the enclosure defining a resonance space, and an air adsorbent applied to the resonance space of the enclosure, wherein an air adsorption mole ratio per unit volume of the air adsorbent based on a change in the unit pressure is 40.6 mol/m3·atm.