close

Вход

Забыли?

вход по аккаунту

?

JP2003179991

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2003179991
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker protection device.
[0002]
2. Description of the Related Art Heretofore, various measures have been proposed and
implemented to prevent the occurrence of ignition accidents due to speakers. For example, the
material forming the damper is changed from cotton cloth to non-combustible material such as
polyimide fiber. Also, the voice coil bobbin is changed from paper or aluminum foil to a material
having low thermal conductivity and noncombustibility. Furthermore, measures have been taken
such as a configuration in which a diaphragm that easily spreads fire is disposed apart from the
damper.
[0003]
However, an abnormal input such as an excessive current or a direct current is supplied to the
voice coil of the speaker, and the voice coil or the like has not been able to prevent the
occurrence of an accident where it is abnormally heated and ignited.
[0004]
13-05-2019
1
The following is mainly considered as a process leading to this firing.
First, the voice coil generates heat due to an abnormal input such as an excessive current or a
direct current, and the temperature thereof significantly rises, whereby a flammable gas is
generated from the mechanical component including the adhesive.
[0005]
Eventually, the insulation coating of the wire forming the voice coil is broken and a short circuit
occurs, causing a large current to instantaneously flow, and a winding portion forming the voice
coil or a lead wire portion drawn from the voice coil sparks. It is often broken though. The
generation of the spark may ignite the above-described combustible gas, leading to an accident.
[0006]
Therefore, it can be understood from the above that if the generation of the spark can be
prevented in the winding portion forming the voice coil or in the vicinity thereof, the ignition
does not occur.
[0007]
By the way, as a conventional speaker protection device, for example, in order to prevent the
inflow of an excessive current, between at least one lead wire of two lead wires drawn from a
voice coil and a relay terminal provided on a diaphragm. There is known one configured to
connect fuses (see, for example, Japanese Utility Model Laid-Open Publication No. 57-141496).
[0008]
In addition to the above, a notch is provided on the top plate that forms the magnetic gap of the
magnetic circuit, and a thermal fuse connected in series with the voice coil is attached to this
notch, and the temperature rises abnormally due to excessive current. There is a system
configured to achieve protection of the speaker in the case of the above (see, for example,
Japanese Utility Model Laid-Open Publication No. 57-158287).
[0009]
Among the above-described conventional techniques, in the former, a fuse is provided between at
13-05-2019
2
least one of the lead wires extracted from the voice coil and the relay terminal provided directly
on the diaphragm. These components are connected to each other, so there is a restriction on
acoustic characteristics, and it is necessary to attach the fuse by soldering etc. on the diaphragm
near the voice coil bobbin, which causes problems in productivity and repair work .
[0010]
Further, in the latter case, it is necessary to form a notch for attaching a fuse to the top plate,
which has the problem that the cost required for the countermeasure is excessive.
[0011]
The present invention has been made in view of such problems in the prior art, and the object of
the present invention is to separate the mounting location of the fuse from the winding portion
of the voice coil and the vicinity thereof. At the same time, it is an object of the present invention
to provide a speaker protection device capable of reliably melting and preventing ignition when
an excessive current is input to a voice coil.
[0012]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker protection
device of the present invention has a fuse connected in series with a voice coil mounted on a
terminal plate of a speaker unit.
[0013]
Also, a fuse connected in series with the voice coil can be attached to the audio signal input
terminal of the speaker system.
[0014]
In addition, fuses connected in series with the voice coil can be provided in the dividing network
of the speaker system.
[0015]
Further, it is effective to use, as the fuse, a wire having a diameter smaller than that of the wire
forming the voice coil and having the same system as that of the wire forming the voice coil.
[0016]
13-05-2019
3
Embodiments of the present invention will be described by way of example with reference to the
drawings.
First, the first embodiment will be described with reference to FIGS. 1 to 3.
In this first embodiment, as shown in FIG. 3, a fuse 2 connected in series with a voice coil 1 is
mounted on a terminal plate 4 for feeding power to a speaker unit 3 as shown in FIG.
[0017]
The terminal board 4 on which the fuse 2 is mounted is an insulating board 7 on which an
attachment portion 6 for fixing to the frame 5 of the speaker unit 3 is formed, and terminals 8, 9
and 10 made of metal pieces attached to the insulating board 7 Is equipped.
[0018]
Further, the fuse 2 has a wire diameter several ranks smaller than the wire diameter of the wire
forming the voice coil 1 and is the same as that of the wire forming the voice coil 1, for example,
copper wire, copper clad aluminum wire, Alternatively, a wire such as an oxygen-free copper wire
is used to have a fuse function.
[0019]
Further, as shown in FIG. 1, the fuse 2 has its both ends 11 and 12 cut and soldered to the
terminal 9 and the terminal 10 respectively, and the middle portion 13 is insulated between the
terminal 9 and the terminal 10 It is wound around the plate 7.
[0020]
In the first embodiment configured as described above, by providing the attachment place of the
fuse 2 to the terminal plate 4 provided on the frame 5 of the speaker unit 3, the winding portion
of the voice coil 1 and the vicinity thereof are sufficiently provided. It became possible to release
it.
13-05-2019
4
As a result, it is possible to prevent the occurrence of sparks at or near the wire portion forming
the voice coil, which is one of the major causes of the occurrence of the ignition accident.
[0021]
Also, when an excessive current or the like is input to the voice coil 1, the fuse 2 made of a wire
having a smaller diameter than the wire of the voice coil 1 is melted before the voice coil 1
generates a spark, and fire occurs. Can be prevented in advance.
[0022]
Furthermore, also in the repair work after the fuse 2 is melted, after winding the wire to the
insulating plate 7 between the terminal 9 and the terminal 10, the both ends 11 and 12 are
soldered to the terminal 9 and the terminal 10 respectively. It is very simple, requires no manhours, and can be extremely inexpensive.
In addition, since the wire constituting the fuse 2 is also a wire of the same system as the voice
coil 1, for example, a wire such as a copper wire, a copper clad aluminum wire, or an oxygen-free
copper wire, the electrical characteristics such as acoustic characteristics are completely
eliminated. There is no effect.
[0023]
Next, a second embodiment will be described based on FIGS. 4 and 5.
In the second embodiment, as shown in FIG. 5, a fuse 15 connected in series to the voice coil of
the speaker unit 14 is provided to the audio signal input terminal 16 of the speaker system.
[0024]
The audio signal input terminal 16 includes, for example, a movable contact portion and a fixed
contact portion, and the push operation moves the movable contact portion away from the fixed
contact portion against the elastic force of a spring or the like, The connection end of the speaker
13-05-2019
5
cord can be inserted.
In addition, when the push operation is released, the movable contact portion is moved toward
the old position by a resilient force such as a spring so as to sandwich the connection end of the
speaker cord with the fixed contact portion to make an electrical connection. It is a push terminal
configured to
[0025]
FIG. 4 is a perspective view of the back side of the audio signal input terminal 16 configured as
described above.
Two terminals 17 and 18 are provided on the back side of the audio signal input terminal 16.
Furthermore, a U-shaped terminal fitting 22 provided with two opposing terminal portions 20
and 21 is attached to the cylindrical attachment portion 19 by a screw 23.
[0026]
The fuse 15 has a wire diameter several ranks smaller than the wire diameter of the wire forming
the voice coil of the speaker unit 14 and has the same wire as the wire forming the voice coil, for
example, copper wire, copper clad aluminum wire Alternatively, a wire such as an oxygen-free
copper wire is used to provide a fuse function.
[0027]
Further, as shown in FIG. 4, the fuse 15 is soldered at one end to the terminal 18 to be
electrically connected, and is extended linearly in the direction of the mounting portion 19 to
form the mounting portion 19. After being wound around a cylindrical portion, it is soldered to
the terminal portion 21 of the terminal fitting 22 and electrically connected.
[0028]
In the second embodiment configured as described above, the fuse 15 is attached to the audio
13-05-2019
6
signal input terminal 16 of the speaker system so that it is far away from the winding portion of
the voice coil of the speaker unit 14 and the vicinity thereof. It became possible.
In addition, when an excessive current or the like is input to the speaker unit 14, the fuse 15
whose diameter is smaller than the diameter of the voice coil of the speaker unit 14 is melted
before the voice coil sparks and breaks, causing ignition. Can be prevented in advance.
[0029]
Further, the repair work after the fuse 15 is melted may be a work of only winding the wire rod
around the cylindrical attachment portion 19 and then only shearing the ends thereof to the
terminal 18 and the terminal portion 21 and soldering. Therefore, the cost can be made
extremely inexpensive, since the operation man-hour is not required.
In addition, since the wire of the same system as the voice coil, for example, a wire such as a
copper wire, a copper clad aluminum wire, or an oxygen-free copper wire, is used as the material
of the wire forming the fuse 15, all of the electrical characteristics such as acoustic
characteristics There is no effect.
[0030]
Next, a third embodiment will be described based on FIG. 6 and FIG.
In the third embodiment, as shown in FIG. 7, a fuse 24 is provided on a printed wiring board 25
which constitutes a dividing network circuit of a speaker system.
[0031]
As shown in FIGS. 6 and 7, a capacitor C1 and a coil L1 constituting a high-pass filter circuit of a
parallel two-way network and a low-pass filter circuit are formed on the printed wiring board 25
constituting this dividing network. A coil L2 and a capacitor C2 are provided.
13-05-2019
7
Reference numeral 26 denotes a high range speaker unit, and 27 denotes a low range speaker
unit.
[0032]
Further, the fuse 24 has a wire diameter several ranks thinner than the wire forming the voice
coil of the low frequency range speaker unit 27, and has the same wire as the wire forming the
voice coil, for example, copper wire, copper clad A fuse function is provided using a wire such as
an aluminum wire or an oxygen free copper wire.
[0033]
Furthermore, as shown in FIG. 6 and FIG. 7, the fuse 24 is linearly arranged between the audio
signal input end 28 of the dividing network circuit and the audio signal input side of the coil L2
constituting the low pass filter circuit. , And mounted on the printed wiring board 25 by
soldering.
[0034]
In the third embodiment configured as described above, the voice coil of the low frequency range
speaker unit 27 is wound by providing the attachment place of the fuse 24 to the printed wiring
board 25 constituting the dividing network circuit. It has become possible to separate further
from the line portion and its vicinity.
In addition, when an excessive current or the like is input to the low frequency range speaker
unit 27, the fuse 24 whose wire diameter is several ranks thinner than the wire diameter of the
voice coil is melted before the voice coil generates a spark and is disconnected. Can be prevented
in advance.
[0035]
Furthermore, the repair work after the fuse 24 is melted is a wire which is several ranks smaller
than the wire diameter of the voice coil and which is the same as the wire forming the voice coil,
for example, copper wire, copper clad aluminum wire, or oxygen free The work may be
performed only by soldering a wire such as a copper wire to the printed wiring board 25, which
13-05-2019
8
is extremely simple, does not require a man-hour, and can be extremely inexpensive.
Further, as the material of the wire constituting the fuse 24 is also a wire of the same system as
the wire constituting the voice coil, for example, a wire such as a copper wire, a copper clad
aluminum wire, or an oxygen-free copper wire, It has no effect on the electrical characteristics.
[0036]
Since the present invention is configured as described above, it is possible to separate the
location for attaching the fuse from the winding portion of the voice coil and the vicinity thereof,
and the winding portion of the voice coil Alternatively, since the fuse bears the disconnection
accompanied by the spark of the lead wire portion of the winding wire, it is possible to prevent
the ignition in advance.
13-05-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jp2003179991
1/--страниц
Пожаловаться на содержимое документа