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US 7,477,757 B2Granted
Dual-gap transducer with radially-charged magnet
AssigneeSTEP Technologies, Inc.
InventorEnrique M. Stiles
Life of this patent
Estimating the term…
Abstract
An electromagnetic transducer such as an audio speaker, having a multi-gap geometry in which there are two or more magnetic air gaps over which magnetic flux flows in a same radial orientation. The magnetic flux is provided by one or more radially-charged magnets.
Claims10
An electromagnetic transducer motor structure comprising:
- a yoke having an axis and including a cup and a pole magnetically coupled to the cup;
- at least one radially charged external magnet magnetically coupled to the cup;
- and
- an upper magnetic air gap and a lower magnetic air gap over which magnetic flux flows between the magnet and the other of the cup and the pole piece;
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis;
- and
- a magnetically conductive focusing ring means magnetically coupled to an inner surface of the external magnet and defining the upper and lower magnetic air gaps.
4 more elements
An electromagnetic transducer comprising:
- a yoke having an axis and including a cup and a pole piece magneticaI1v coupled to the cup;
- at least one radially charged external magnet magnetically coupled to the cup;
- and
- an upper magnetic air gap and a lower magnetic air gap over which magnetic flux flows between the magnet and the other of the cup and the pole piece;
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis;
- a diaphragm assembly having a voice coil disposed at least partially in one of the magnetic air gaps;
- and
- a single voice coil extending substantially from a center of the upper magnetic air gap substantially to a center of the lower magnetic air gap.
5 more elements
An electromagnetic transducer comprising:
- a yoke having an axis and including a cup and a pole piece magnetically coupled to the cup;
- at least one radially charged external magnet magnetically coupled to the cup;
- and
- an upper magnetic air gap and a lower magnetic air gap over which magnetic flux flows between the magnetic and the other of the cup and the vole piece;
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis;
- and
- a diaphragm assembly having,
- a first voice coil extending from the upper magnetic air gap in a first axial direction, and
- a second voice coil extending substantially from the lower magnetic air gap in a second direction opposite the first direction.
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis.
7 more elements
An electromagnetic transducer motor structure comprising:
- a yoke having an axis and including cup and a pole piece magnetically coupled to the cup;
- a first radially charged external magnet magnetically coupled to the cup and defining an upper magnetic air gap to the pole piece;
- and
- a second radially charged external magnet magnetically coupled to the cup and defining a lower magnetic air gas to the pole piece;
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis;
- and
- an electrically conductive shorting ring disposed between the first radially charged external magnet and the second radially charged external magnet.
4 more elements
An electromagnetic transducer comprising:
- a yoke having an axis and including a cup and a pole piece magnetically coupled to the cup;
- a first radially charged external magnet magnetically coupled to the cup and defining an upper magnetic air gap to the pole piece;
- and
- a second radially charged external magnet magnetically coupled to the cup and defining a lower magnetic air gap to the pole piece;
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis;
- a diaphragm assembly having a voice coil disposed at least partially in one of the magnetic air gaps;
- wherein the voice coil comprises a single voice coil extending substantially from a center of the upper magnetic air gap substantially to a center of the lower magnetic air gap.
4 more elements
An electromagnetic transducer comprising;
- a yoke having an axis and including a cup and a pole piece magnetically coupled to the cup;
- a first radially chained external magnet magnetically coupled to the cup and defining an upper magnetic air gap to the pole piece;
- and
- a second radially charged eternal magnet magnetically coupled to the cup and defining a lower magnetic air gap to the pole piece;
- wherein magnetic flux over the upper and lower magnetic air gaps is in a first same radial direction with respect to the axis;
- a diaphragm assembly having a voice coil disposed at least partially in one of the magnetic air gaps;
- wherein the voice coil comprises,
- a first voice coil extending from the upper magnetic air gap in a first axial direction, and
- a second voice coil extending substantially from the lower magnetic air gap in a second direction opposite the first direction.
6 more elements
Dependencies are inferred from the claim text.