Loudspeaker and electrodynamic acoustic transducer with bulbous waveguide tip
AssigneeDefinitive Technology, LLC
InventorsTimothy A Gladwin, Jason B Cochrane
Life of this patent
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Abstract
An electrodynamic acoustic transducer has a diaphragm and a frame with a pole piece carrying a bulbous waveguide tip which reduces or eliminates high frequency distortions caused by destructive interference within the transducer. The bulbous-tip structure clears the moving parts of the transducer and minimizes diffraction of sound energy, extending forward approximately to the plane defined by the outer periphery of the diaphragm when the diaphragm and voice coil are at rest. The bulbous-tip waveguide member extends radially outward above the central radiating area of the transducer diaphragm or cone so as to obscure the center portion of the diaphragm.
Claims18
An electrodynamic acoustic transducer configured for use in a loudspeaker system, comprising:
- a pole piece comprising a first or distal end;
- a voice coil comprising wire windings configured to receive electrical current, the voice coil being configured to move along the first end of the pole piece;
- a magnetic structure comprising parts defining an air gap, wherein the voice coil on the first end of the pole piece is disposed in the air gap so that the magnetic structure creates a magnetic field in which the voice coil is configured to move along the first end of the pole piece;
- a first diaphragm comprising an inner periphery defining a central opening and an outer periphery, the inner periphery of said first diaphragm being attached to the voice coil to move with the voice coil;
- and
- a waveguide extension structure disposed on the first end of the pole piece, said waveguide extension having a bulbous tip that projects radially to a larger diameter than the pole to project laterally over the inner radiating area of said first diaphragm.
An improved loudspeaker system, comprising:
- at least one front-facing midrange or mid-bass bulbous-tip waveguide transducer mounted in a baffle in an enclosure to create a loudspeaker assembly;
- said bulbous-tip waveguide transducer comprising a pole piece comprising a first end;
- a voice coil comprising wire windings configured to receive electrical current, the voice coil being configured to move along the first end of the pole piece;
- a magnetic structure comprising parts defining an air gap, wherein the voice coil on the first end of the pole piece is disposed in the air gap so that the magnetic structure creates a magnetic field in which the voice coil is configured to move along the first end of the pole piece;
- a first diaphragm comprising an inner periphery defining a central opening and an outer periphery, the inner periphery of said first diaphragm being attached to the voice coil to move with the voice coil;
- and a waveguide extension structure disposed on the first end of the pole piece, said waveguide extension having a bulbous tip that projects radially to a larger diameter than to project laterally over the inner radiating area of said first diaphragm.
Dependencies are inferred from the claim text.