Wax, copper foil flexible wire with wax and speakers using...

Details Wax, copper foil flexible wire with wax and speakers using... Wax, copper foil flexible wire with wax and speakers using...

2000-03-30

2001-04-17

Kuntz, Curtis A. (Department: 2743)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S400000, C427S443000

Reexamination Certificate

active

06219433

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to wax used as a surface treating agent, a copper foil flexible wire impregnated with the wax and speakers using this flexible wire.
BACKGROUND OF THE INVENTION
A speaker is constructed as shown in FIG.
2
.
A magnetic circuit
1
is composed of a lower plate
1
a
having a center pole section, a magnet
1
b
and an upper plate
1
c.
A frame
2
is mounted on the upper side of the magnetic circuit
1
. An outer rim of the diaphragm
3
is connected to the inner rim of the frame
2
, and the inner rim of the diaphragm
3
is connected to a voice coil bobbin
4
inserted into a magnetic gap
1
d
of the magnetic circuit
1
.
The frame
2
has a lead out terminal
5
. The voice coil bobbin
4
is wound up with a voice coil
6
. The lead out terminal
5
is electrically connected to the voice coil
6
by the copper foil flexible wire
7
.
As shown in
FIG. 3
, the copper foil flexible wire
7
is constituted of braiding or stranding a plurality of core wires
8
, each of which is wound by copper foil
9
. Although there are some other constitutions of the flexible wire, it is generally called a gold wire or glorious wire.
The speaker generates sounds by inputting sound signals to the lead out terminal
5
in order to drive the voice coil bobbin
4
and thus to vibrate the diaphragm
3
.
Recently in a tendency to increase the input capacity to a speaker, there have been disadvantages when using the copper foil flexible wire
7
. It vibrates by the vibration of diaphragm
3
, which is called a hopping phenomenon. This phenomenon results, in noise being generated when the copper foil flexible wire
7
collides with diaphragm
3
. The copper foil of the flexible wire
7
may break in an extreme case.
In order to overcome these disadvantages, some types of copper foil flexible wire
7
are impregnated with wax. However, this type of flexible wire
7
must be flame resistant against the rise of temperature itself, when the input capacity to the speaker is increased.
It is an object of the present invention to provide wax which is excellent as a surface treating agent, a copper foil flexible wire treated to be flame resistant, and a speaker using this flexible wire.
DISCLOSURE OF THE INVENTION
Wax according to the present invention comprises petroleum as a base, which is mixed with a liquid phosphoric ester flame retardant, and can realize a flame resistant wire such as the copper foil flexible wire without degrading its flexibility.
Wax according to an embodiment of the present invention is characterized in that the petroleum wax as a base is mixed with 50 wt %-150 wt % of liquid phosphoric ester flame retardant, and it can realize the highly flame resistant copper foil wire which satisfies the UL Standards 94V-2 (Standards of Underwriter Laboratory of the United States) or higher levels without degrading its flexibility when the copper foil wire is impregnated with the wax.
Wax according to a second embodiment comprises petroleum wax as a base, wherein it is mixed with a bromine type incombustible which is containing flame retardant accounting for 50 wt %-150 wt % of the wax with a melting point of 70° C.-140° C. and a decomposition point of 250° C. or above; cyclic saturated hydrocarbon accounting for 5 wt %-50 wt % of for the wax with a melting point of 70° C.-140° C.; and an inorganic flame retardant accounting for 1 wt %-10 wt % of the wax; and an organic compound as a stabilizer accounting for 0.5 wt %-5 wt % of the wax. It can realize the highly flame resistant copper foil wire which satisfies the UL Standards 94V-2 or higher level without degrading its flexibility when the copper foil wire is impregnated with the wax.
A copper foil flexible wire for a speaker according to an embodiment is characterized in that the wire is constituted by a plurality of core wires, each of which is wound by copper foil being braided together or stranded, impregnated with the wax of the above mentioned embodiments. It can realize the highly flame resistant copper foil wire which satisfies the UL Standards 94V-2 or higher level without degrading its flexibility.
A speaker according to another embodiment is characterized in that the copper foil flexible wire which electrically connects the lead out terminal mounted on the frame to the voice coil wound around the voice coil bobbin is constituted by a plurality of core wires wound by copper foil being braided together or stranded, and is impregnated with the wax according the above mentioned embodiments. A highly flame resistant speaker with a highly flame resistant copper foil flexible wire can be realized.


REFERENCES:
patent: 2657758 (1953-11-01), Varnet
patent: 5602931 (1997-02-01), Geisenberger
patent: 6115479 (2000-09-01), Okuzawa et al.
patent: 58-75708 (1983-05-01), None
patent: 363224595 (1988-09-01), None
patent: 407207263 (1994-01-01), None

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