Wireless earplug with improved sensitivity and form factor
First Claim
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1. A wireless communications earplug for use with a magnetic field transmitter, comprising:
- a) a receiver comprising a coil of wire wound upon a bobbin of magnetic material; and
b) a speaker having a case at least partially made of magnetic material, an acoustic output and an electrical input coupled to the wire of the receiver;
wherein the receiver is mounted within 0.005 inches of the case of the speaker and oriented such that flux lines passing through the speaker are directed through the coil of the receiver and a measured inductance of the coil of the receiver is increased compared to an inductance of the coil of the receiver when the receiver is not mounted to the speaker.
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Abstract
An improved wireless communications earplug for use with a magnetic field transmitter. The wireless earplug has a receiver made of a coil of wire on a magnetic bobbin, mounted in close proximity or in contact with a magnetic case of a speaker. The magnetic case of the speaker serves to increase the magnetic flux through the receiver and improves the efficiency of the earplug. The speaker is acoustically coupled to an eartip, and the earplug may be molded into a custom earplug body.
59 Citations
17 Claims
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1. A wireless communications earplug for use with a magnetic field transmitter, comprising:
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a) a receiver comprising a coil of wire wound upon a bobbin of magnetic material; and b) a speaker having a case at least partially made of magnetic material, an acoustic output and an electrical input coupled to the wire of the receiver; wherein the receiver is mounted within 0.005 inches of the case of the speaker and oriented such that flux lines passing through the speaker are directed through the coil of the receiver and a measured inductance of the coil of the receiver is increased compared to an inductance of the coil of the receiver when the receiver is not mounted to the speaker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communications system comprising:
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a) a magnetic field transmitter; b) a receiver comprising a coil of wire wound upon a bobbin of magnetic material; and c) a speaker having a case at least partially made of magnetic material, an acoustic output and an electrical input coupled to the wire of the receiver; and wherein the bobbin of the receiver is mounted in sufficiently close proximity to the case of the speaker such that a measured inductance of the coil of the receiver is increased compared to an inductance of the coil of the receiver when the receiver is not mounted to the speaker, and the receiver is oriented such that flux lines passing through the speaker are directed to pass through the coil of the receiver. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification