Wireless Battery-Free Magnetic Induction Earplug with Expansion Cavity
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United States of America
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Apr 3, 2025
app pub date -
Sep 27, 2024
filing date -
Sep 27, 2024
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Abstract
A battery-free magnetic induction earplug includes a housing defining a main cavity, a sound output channel connected to the main cavity, and an expansion cavity. The battery-free magnetic induction earplug can also include a receiver in the main cavity, and can include a speaker in the main cavity adjacent the receiver, the receiver including a bobbin and a coil of wire wound upon the bobbin, the speaker acoustically coupled to the sound output channel, the speaker having a diaphragm and a volume upstream from the diaphragm, and the speaker having a vent from the volume to the expansion cavity.
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