Magnet and coil assembly
First Claim
1. A magnet and coil assembly comprising:
- a magnet structure comprising an axially magnetized first dipole portion and an axially magnetized second dipole portion, wherein the first dipole portion is adjacent to the second dipole portion at a first boundary, and wherein the first and second dipole portions have oppositely oriented polarities at the first boundary; and
a movable first coil having a central axis coaxial to a central axis of the first dipole portion, wherein the first coil is proximal to and spaced apart from a first surface of the magnet structure.
1 Assignment
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Accused Products
Abstract
A magnet and coil assembly comprises a multi-pole magnetic structure, a coil, an object associated with the coil, and a circuitry for applying a current through the coil. The multi-pole magnetic structure comprises a plurality of magnetic source regions that each extend from a first side of said multi-pole magnetic structure to a second side of said multi-pole magnetic structure and include a first magnetic source region having a first polarity and a second magnetic source region having a second polarity. The multi-pole magnetic structure has a polarity transition region having a polarity transition boundary corresponding to an outer perimeter of the first magnetic source region where a magnetic field measured on the first side or the second side of said multi-pole magnetic field structure transitions from the first polarity to said second polarity. The coil is configured proximate to the first side of said multi-pole magnetic structure and about the polarity transition boundary. When the current travels in a first current direction through the coil the object moves in a first movement direction and when the current travels in a second current direction through the coil the object moves in a second movement direction.
6 Citations
28 Claims
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1. A magnet and coil assembly comprising:
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a magnet structure comprising an axially magnetized first dipole portion and an axially magnetized second dipole portion, wherein the first dipole portion is adjacent to the second dipole portion at a first boundary, and wherein the first and second dipole portions have oppositely oriented polarities at the first boundary; and a movable first coil having a central axis coaxial to a central axis of the first dipole portion, wherein the first coil is proximal to and spaced apart from a first surface of the magnet structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 23, 25, 27)
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12. A loudspeaker assembly comprising:
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a multiple-pole magnet structure comprising a first magnetic region having a central magnet axis and a first polarity orientation, a second magnetic region adjacent to the first magnetic region and having a second polarity orientation, and a polarity transition between the first and second magnetic regions; and a loudspeaker coil provided above and spaced apart from the magnet structure, the coil having a central coil axis that is substantially collinear with the central magnet axis of the first magnetic region, and the loudspeaker coil includes an inner coil boundary and an outer coil boundary that extend perpendicular to a first surface of the magnet structure at or near the polarity transition region. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 24, 26, 28)
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20. A speaker system comprising:
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a loudspeaker coil coupled to a loudspeaker speaker cone; a multiple-pole magnet, including; an inner magnet region having a first polarity; an outer magnet region provided adjacent to the inner magnet region and having an opposite second polarity; and a transition region at an interface between the inner and outer magnet regions, the transition region defining a transition axis through the multiple-pole magnet; and an inner ferromagnetic flux circuit provided adjacent to the inner magnet region of the multiple-pole magnet; and an outer ring-shaped ferromagnetic flux circuit provided adjacent to the outer magnet region of the multiple-pole magnet; wherein the inner and outer ferromagnetic flux circuits provide respective inner sidewall and outer sidewall portions of a first gap; wherein at least a portion of the loudspeaker coil is suspended in the first gap; and wherein the loudspeaker coil includes a coil axis that is parallel to the transition axis. - View Dependent Claims (21, 22)
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Specification