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US 8,385,580 B2Granted
High power low frequency transducers and method of assembly
AssigneeAdamson Systems Engineering Inc.
InventorAlan Brock Adamson
Life of this patent
Estimating the term…
Abstract
An acoustic transducer including a sound producing cone that is activated by a voice coil cylinder having a pair of spaced electrical windings that are retained in spaced relationship from a surround ferromagnetic ring that is carried by a heat sink and wherein a magnetic subassembly is mounted within the voice coil cylinder. The voice coil cylinder is supported by a pair of spaced suspension members or spiders and by the sound producing cone.
Claims23
An acoustic transducer comprising:
- a magnetized permanent magnet subassembly supported by a third non ferrous frame structure;
- a ferromagnetic cylinder seated within and affixed to a second non ferrous frame structure, the second non ferrous frame structure being configured for heat dissipation such that the ferromagnetic cylinder and the second non ferrous frame structure are in a thermally conducting heat dissipation relationship, the second non ferrous frame structure being bolted to the third non ferrous frame structure to provide an annular gap between the ferromagnetic cylinder and the magnetized permanent magnet subassembly, said third non ferrous frame structure including a self alignment feature for aligning and stabilizing the magnetized permanent magnet subassembly relative to the third non ferrous frame structure;
- a voice coil cylinder carrying at least one two conductive winding windings, a first of said at least two conductive windings being spaced from a first end of said voice coil cylinder, and a second of said at least two conductive windings being spaced from a second end of the voice coil cylinder, the voice coil cylinder supported within the annular gap by an inner a first suspension member attached to one of said opposite ends which is associated with also attached to the third non ferrous frame structure and an outer a second suspension member attached to the other of said opposite ends which is also attached to a non ferrous frame structure other than the third non ferrous frame structure so that said voice coil cylinder encases all permanent magnetic material of the acoustic transducer;
- and
- a mechanically supported sound producing cone connected to the voice coil cylinder.
2 more elements
A method of assembling an acoustic transducer, comprising:
- supporting an already magnetized permanent magnet subassembly by a third non ferrous frame structure;
- connecting an inner first suspension member for a voice coil cylinder to the third non ferrous frame structure, said voice coil cylinder carrying two conductive windings spaced adjacent opposite ends of the voice coil cylinder;
- affixing a ferromagnetic cylinder to a second non ferrous frame structure;
- aligning and stabilizing the already magnetized permanent magnet subassembly on the third non ferrous frame structure using self alignment features on said third non ferrous frame structures, bolting the second non ferrous frame structure associated with the ferromagnetic cylinder to the third non ferrous frame structure to provide for the voice coil cylinder an annular gap between the ferromagnetic cylinder and the already magnetized permanent magnet subassembly, the second non ferrous frame structure being configured for heat dissipation such that the ferromagnetic cylinder and the second non ferrous frame structure are in a thermally conducting heat dissipation relationship, said already magnetized permanent magnet subassembly and said ferromagnetic cylinder being positioned such that said voice coil cylinder encases all permanent magnetic material of the acoustic transducer;
- connecting a second suspension member for the voice coil cylinder to a non ferrous frame structure other than the third non ferrous frame structure;
- connecting a sound producing cone to the voice coil;
- and
- mechanically supporting the sound producing cone.
5 more elements
An acoustic transducer comprising:
- a third support frame component including a pedestal portion and a first suspension member, said first support frame component being made from a non ferrous material;
- a magnetized permanent magnet subassembly including a permanent magnet located between front and rear plates, said magnetized permanent magnet subassembly being seated on said pedestal portion of said third support frame component so that said rear plate rests on said pedestal portion;
- a second support frame component configured for dissipating heat from the transducer, said second support frame component including a rear end, an opposing front end, and a non ferrous heat sink surrounding a ferromagnetic cylinder with the ferromagnetic cylinder and the non ferrous heat sink being in a thermally conducting heat dissipation relationship, said rear end of said second support frame component being bolted to said third support frame component so that said ferromagnetic cylinder encases said magnetized permanent magnet assembly at a spaced distance therefrom to create an annular gap between said magnetized permanent magnet assembly and said ferromagnetic cylinder;
- a first support frame component supporting a second suspension member, said first support frame component being bolted to said front end of said second support frame component;
- and
- a voice coil cylinder including a rear end, an opposing front end, and two spaced conductive windings, a first of said two conductive windings being spaced from said front end of said voice coil cylinder, and a second of said two conductive windings being spaced from said rear end of said voice coil cylinder, said voice coil cylinder being received within said annular gap between said magnetic assembly of said third support frame component and said ferromagnetic cylinder of said second component so that said conductive windings of said voice coil cylinder are positioned between said magnetized permanent magnet subassembly and said ferromagnetic cylinder, said rear end of said voice coil cylinder being secured to said first suspension member of said third support frame component and said front end of said voice coil cylinder being secured to said second suspension member of said third component;
- and
- said third support frame component including self alignment features for aligning and stabilizing the magnetized permanent magnet subassembly relative to the third support frame component.
5 more elements
Dependencies are inferred from the claim text.