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| Acoustic conditioner |
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Audio voice coil adaptor ring
| Details |
Inventors: Proni, Lucio;
Assignee:
Primary Examiner: Kuntz; Curtis A.
Assistant Examiner: Harvey; Dionne N.
Attorney, Agent or Firm: Holland & Knight LLP
A voice coil adaptor ring and loudspeaker system of the moving coil type including a cone diaphragm supported by a frame, a voice coil former for supporting a voice coil, and a lower suspension for securing and centering the voice coil former in a magnetic gap while it is displaced by a magnetic circuit. The voice coil adaptor ring is mounted over the voice coil former and comprises a substantially cylindrical sleeve having a lower diameter for fitting over the top plate; at least one ledge extending outward from said sleeve for supporting the cone and lower suspension; an inherent gap for receiving epoxies; and a plurality of venting passages in fluid communication with a cap volume defined by the cone and dust cap for venting hot air from the cap volume. |
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DETAILED DESCRIPTION OF THE INVENTION With reference to the drawings, FIGS.
2a-12 depict the various embodiments of the voice coil adaptor ring and loudspeaker system 10 incorporating the adaptor ring, in accordance with the instant invention.
Referring to FIG.
2a, the loudspeaker 20 of the instant invention incorporates the voice coil adaptor ring 50 and comprises a cone-shaped diaphragm 24 (cone), which may or may not include a cap 26, a frame 22 supporting the upper end of the cone 24, a voice coil 40 comprising a winding 42 wrapped around a voice coil former 43, the voice coil adaptor ring 50 attached to the upper end of the former 43, an upper suspension 28, a spider 38, and a magnetic motor structure.
The spider 38 is attached and adhered to the adaptor ring 50 to provide a centering force for the former 43 and voice coil 40.
The motor structure comprises at least one magnet 35, a solid pole piece 41, a riser top plate 36, and a back plate 33.
The pole piece 41 may be staggered, T-cut, or under-cut to prevent leakage of magnetic flux.
The top plate 36 may also be staggered to prevent leakage, as discussed infra.
A magnetic gap 45 exists between the top plate 36 and the pole piece 41.
Together, the adaptor ring 50 and spider suspension 38 center the voice coil 40 in this gap.
The loudspeaker 20 comprises a unique riser top plate 36 and adaptor ring 50.
The top plate 36, in combination with the adaptor ring 50, provides for a more shallow speaker design by allowing the speaker motor structure and voice coil 40 to be moved upward into the cone volume.
This is achieved without compromising excursion or changing the dimensions of the magnet 35 and pole piece 41.
The top plate 36 is substantially L-shaped, whereby it has a vertical leg 36a and a horizontal leg 36b.
The top plate 36 may comprise other shapes so long as it has a substantially vertical leg.
The horizontal leg 36b rests on the magnet 35, as shown.
The vertical leg 36a rises upward alongside the pole piece 41 and has an outside diameter which fits inside the adaptor ring 50
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