Acoustically Active Articles
A kind of product and acoustic technology, applied in the direction of ceramic products, microphones, other chemical processes, etc., can solve problems such as difficult sound
Active Publication Date: 2022-06-21
3M INNOVATIVE PROPERTIES CO
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- Summary
- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
The small housing cavity in the device makes it difficult to achieve rich sound in the low frequency range
Method used
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Embodiment approach 1
[0077] Embodiment 1 is an article comprising:
[0078] A plurality of porous inorganic agglomerates having an average size in the range of about 50 microns to about 2 mm, the porous agglomerates each comprising a network of carbon or silica and metal oxide particles embedded in the network.
Embodiment approach 2
[0079] Embodiment 2 is the article of embodiment 1, wherein the network of carbon or silica is the product of pyrolysis of the polymeric binder at an elevated temperature in the range of 400°C to 1000°C.
Embodiment approach 3
[0080] Embodiment 3 is the article of embodiment 2, wherein the polymeric binder comprises vinyl, (poly)styrene, (poly)acrylonitrile, (poly)acrylate, phenolic resin, benzoxazine, melamine resin , one or more of epoxy resin and siloxane.
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Abstract
The invention provides articles and methods of making and using the articles. The article comprises inorganic agglomerates having an average size in the range of about 50 microns to about 2 mm, the porous agglomerates each comprising a network of carbon or silica and metal oxide particles embedded in the network. Some agglomerates are capable of lowering the resonance frequency of an acoustic device when the resonance frequency is in the range of about 50 Hz to about 1500 Hz.
Description
technical field [0001] The present disclosure relates to compositions of inorganic porous agglomerates and methods of making and using the same as acoustically active articles. Background technique [0002] The acoustic components of electronic devices, such as speakers in handheld electronic devices, are getting smaller as the devices get thinner. The small housing cavity in the device makes it difficult to achieve rich sound in the low frequency range. Acoustically active materials built into the speaker enclosure help lower the device's resonant frequency. The most commonly used materials today are foams, fibers, zeolites and activated carbons. SUMMARY OF THE INVENTION [0003] Briefly, in one aspect, the present disclosure describes an article comprising a plurality of porous inorganic agglomerates having an average size in a range from about 50 microns to about 2 mm. The porous inorganic agglomerates each comprise a network of carbon or silica and metal oxide parti...
Claims
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IPC IPC(8): C04B38/00C04B35/14C04B35/524C04B35/63C09K3/14H04R1/00
CPCC04B35/14C04B35/524C04B35/6316H04R1/2811H04R29/001C04B2111/92C04B2235/3217C04B2235/3218C04B2235/3244C04B2235/44C04B2235/48C04B2235/483H04R2201/029C04B38/0022C04B35/52C04B38/0054C04B38/0067C04B35/63424C04B35/63444C04B35/63452C04B35/6348C04B2235/5436C04B2235/5445C04B2235/96H04R2307/025
Inventor F·斯托尔曾伯格林沁N·O·珊蒂M·D·拉德克利夫R·W·格迪斯
Owner 3M INNOVATIVE PROPERTIES CO