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US 11,109,150 B2Granted
Coating for improving loudspeaker sound quality
AssigneeApple Inc.
InventorsJuergen Sauer, Veronika Wagner
Life of this patent
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Abstract
Aspects are disclosed of an acoustically active coating. The coating is a highly porous coating having a thickness and including between 2% and 30% by mass of a binder and between 70% and 98% by mass of a zeolite. The coating comprises an irregular matrix formed by a plurality of convex shapes connected by concave connectors and has a distribution of pore sizes. Other embodiments are disclosed and claimed.
Claims26
An audio speaker comprising:
- a housing defining a back volume behind a speaker driver, wherein the speaker driver can convert an electrical audio signal into a sound so that the sound can propagate through a gas in the back volume;
- and
- a highly porous acoustically active coating deposited on at least one interior surface of the back volume, the highly porous coating including a binder and an adsorptive substance;
- wherein the highly porous acoustically active coating comprises an irregular matrix of connected particles.
1 more element
An acoustically active coating comprising:
- a highly porous coating having a thickness and including between 2% and 30% by mass of a binder and between 70% and 98% by mass of a zeolite, wherein the coating comprises an irregular matrix formed by a plurality of connected particles and has a distribution of pore sizes.
A process comprising:
- preparing a slurry including a binder and a zeolite;
- spraying the slurry through a nozzle having a nozzle diameter;
- and
- depositing a highly porous acoustically active coating on a substrate by directing the sprayed slurry through an environment onto the substrate, the substrate being positioned at a distance from the nozzle,
- wherein the highly porous acoustically active coating comprises an irregular matrix of connected particles.
2 more elements
Dependencies are inferred from the claim text.