Shorting ring fixture for electromagnetic transducer
AssigneeSTEP Technologies, Inc.
InventorsRichard Calderwood, Enrique Stiles
Life of this patent
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Abstract
An electromagnetic transducer such as an audio speaker, having a motor structure in which a shorting ring that sinks eddy currents also serves as a permanent fixture to provide coaxial alignment of two or more components within the transducer. These components could include various combinations of the yoke, the top plate, the magnet, and/or other parts. Ideally, the shorting ring extends axially as close as possible to the voice coil, to a position immediately adjacent the magnetic air gap.
Claims20
An electromagnetic transducer motor structure comprising:
- a yoke;
- a magnet and plate stack of a plurality of components including,
- a first permanent magnet magnetically coupled to the yoke,
- a first magnetically conductive plate magnetically coupled to the first permanent magnet(s) and defining a first magnetic air gap with the yoke;
- and
- a first shorting ring fixture coupled to, and coaxially aligning, a set of fixtured components, wherein the set of fixtured components includes at least two of the yoke, the first permanent magnet, and the first plate.
An improvement in an electromagnetic transducer that includes a diaphragm assembly coupled to a motor structure, the diaphragm assembly including a voice coil, the motor structure including a magnetic circuit having a yoke, a magnet and plate stack, and a magnetic air gap within which the voice coil is disposed, wherein the improvement comprises:
- a first electrically conductive fixture mechanically, radially aligning at least two components in the motor structure;
- and
- the fixture being disposed in close proximity to the voice coil.
An audio speaker driver comprising:
- a diaphragm assembly including,
- a diaphragm, and
- a voice coil coupled to the diaphragm;
- and
- a motor structure including,
- a yoke,
- a permanent magnet magnetically coupled to the yoke,
- a top plate magnetically coupled to the permanent magnet and defining a magnetic air gap with the yoke, wherein the voice coil is disposed within the magnetic air gap, and
- an electrically conductive, magnetically non-conductive shorting ring coupled to, and fixturing into a fixed radial position with respect to each other, the top plate and at least one other component of the audio speaker driver.
Dependencies are inferred from the claim text.