Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Reexamination Certificate
2000-09-08
2001-09-18
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
C336S198000
Reexamination Certificate
active
06292079
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to speakers, and more particularly to a coil assembly of a speaker with improved higher output power and effective heat dissipation.
2. Description of the Prior Art
FIG. 1
shows a conventional single-barrel coil assembly (
2
) formed by bending a bottom end of a main tube (
21
) outwardly into a folded rim (
211
), then winding a coil
22
on the main tube (
21
) in four layers at least for heat dissipation of the coil
22
through the main tube (
21
).
Whereas heat can not be well dissipated and output power is stagnated in the conventional coil assembly (
2
), this invention is to provide an improved coil assembly that can enhance output power and lifetime of a speaker.
SUMMARY OF THE INVENTION
The primary object of this invention is to provide a coil assembly for effectively raising speaker output power by offering a double-wall tubular structure composed of an inner and an outer tubular wall, wherein a bottom end of the inner tubular wall is bent outwardly into a flat rim for stopping the outer tubular wall when the same is collared onto the inner tubular wall; a choking slit is split longitudinally in the outer tubular wall to permit winding two layers of coil.
The commented effectiveness of this invention may be summarized in the following:
1. About 30% improvement is made for output power.
2. Heat of the coil can be dissipated efficiently through the inner and the outer tubular walls.
3. By using the double wall design of this invention, the speaker volume can be minimized.
REFERENCES:
patent: 4397234 (1983-08-01), Lee et al.
patent: 5726616 (1998-03-01), Bell
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