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7471805 |
Hearing aid mechanism
A hearing aid includes a sound input device, and a speaker, wherein the speaker includes a compartment with magnet suspended in a fluid containing magnetic particles and wherein a coil wrapped...
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7403632 |
Audio speaker utilizing an unanchored magnet for primary force generation
A speaker apparatus has a container holding a volume of ferrofluid, a permanent magnet suspended in the ferrofluid, and a magnetic excitation apparatus proximate the container. Operation of the...
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7386144 |
Inertial voice type coil actuator
The present invention provides an intertial-type voice actuator that includes a magnetic flux conductive material core with a continuous channel. The channel has antifringing groove. The actuator...
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7266214 |
Audio speaker and method for assembling an audio speaker
An audio speaker includes a driver unit having a magnetic pole case defining a radial gap, a vibration system having a diaphragm and a voice coil where the vibration system is fixed to the drive...
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7248714 |
Micro-speaker and method for assembling a micro-speaker
The micro-speaker includes a driver unit having a housing, a magnet disposed within the housing forming a radial gap between the magnet and the circumferential walls of the housing, and a magnetic...
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7149323 |
Speaker
A speaker comprising: a magnetic circuit provided with a through hole, and a recess formed around the through hole for retaining a magnetic fluid. The speaker further comprises a bearing provided...
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6993147 |
Low cost broad range loudspeaker and system
A loudspeaker has a diaphragm with a voice coil disposed about its perimeter and extending in a gap into which the flux of an annular rare earth magnet is focused. An opening behind the diaphragm...
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6654477 |
Receiver and method of construction
A receiver for converting electrical energy to acoustical energy, and a method of manufacturing the receiver, are disclosed. The receiver comprises an armature having a peripheral edge, a magnet...
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6438250 |
Method for making a conductor, or electric circuit balanced in radioelectric interference such as micro-discharge and corresponding conductor or circuit
The invention relates to a manufacturing process of an electrical conductor or circuit compensated for radio interferences, including those from the electrical circuit itself. An application of a...
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6208743 |
Electrodynamic acoustic transducer with magnetic gap sealing
An electrodynamic acoustic transducer with a coil which projects into an air gap subject to an electromagnetic field, wherein an acoustic short circuit is prevented. The electrodynamic transducer...
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6041131 |
Shock resistant electroacoustic transducer
The present invention relates to a hearing aid receiver (10) having a coil (12) with a tunnel (14) therethrough, a magnetic structure (16) having a central magnetic gap (18), an armature (20), and...
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5894524 |
High power tweeter
A high power compact tweeter which includes a high energy magnet sandwiched between the base of a yoke and top plate which form the magnetic path, the magnet and top plate being spaced from side...
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5687248 |
Light weight and low magnetic leakage loudspeaker
A magnetic circuit applied for loudspeakers includes a cup-shaped yoke, a primary magnet, a surrounding top plate, a first central top plate, and a thin magnet. The cup-shaped yoke includes a...
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5583945 |
Speaker with a molded plastic frame including a positioning projection, and a method for manufacturing the same
A plastic-molded frame 3 has a bottom-closed cylindrical magnetic circuit holding portion 2 which has a positioning projection 6 provided in a central portion on a bottom surface 2a of the magnetic...
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5524151 |
Electroacoustic transducer having a mask
In an electroacoustic transducer (1) having a diaphragm (5), a partition wall (24) situated behind the diaphragm (5) and traversed by partition openings (25, 26, 7, 28 and 29, 30, 31, 32), and a...
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5335287 |
Loudspeaker utilizing magnetic liquid suspension of the voice coil
A loudspeaker is provided with a viscous magnetic fluid suspension for the voice coil, rather than the corrugated disk suspension that is conventionally used. Specially designed vent passages are...
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5216723 |
Permanent magnet transducing
A transducer includes a core of low reluctance magnetic material formed with a narrow gap. There are first and second coils of conductive material wound on the core adjacent to and on opposite...
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4914750 |
Sound transducer
A sound transducer converts electrical signals into mechanical motion. A transducer comprises a transducer housing including a diaphragm section having an inner concave surface and an outer convex...
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4414437 |
Moving coil dynamic transducer
In an electromagnetic transducer including a member producing a magnetic field and presenting an air gap traversed by the field, a mass of magnetic liquid extending across the air gap, and a moving...
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4320263 |
Dynamic transducer with moving coil in an air gap filled with magnetic liquid
A dynamic electroacoustic transducer comprising a magnetic pole case defining a magnetic air gap, a coil movably mounted in the air gap and spaced from the magnetic pole case with magnetic liquid...
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4303806 |
Dynamic electroacoustic transducer having a moving coil in an air gap filled with a magnetic liquid
A dynamic electroacoustic transducer includes a moving coil which is arranged in an air gap between a pole piece and a pole plate which is filled with a magnetic liquid. At least the outside of the...
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4017694 |
Method for making loudspeaker with magnetic fluid enveloping the voice coil
A method for the manufacture of loudspeakers having a ferromagnetic fluid contained in the voice coil magnetic air gap and being confined by the loudspeaker magnet field thereby enveloping the...
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