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JPH0614383

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DESCRIPTION JPH0614383
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker characterized by reducing electromagnetic radiation noise.
[0002]
2. Description of the Related Art In recent years, electromagnetic radiation noise from a speaker
mounted in the vicinity of an antenna may become a problem due to hi-fi of car audio, etc. As a
countermeasure, mounting in front of a speaker frame or speaker Methods such as dropping the
metal dustproof net to the body ground were taken.
[0003]
However, in the conventional configuration, the noise source components of the speaker are not
shielded but are shielded at a distance, so that sufficient effects can not be obtained. It was
In the future, a switching amplifier or the like will be used for the audio amplifier, and the
radiation noise from the speaker will tend to increase further, and the conventional method has
become insufficient.
[0004]
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An object of the present invention is to provide a speaker with reduced electromagnetic radiation
noise in order to solve the above-mentioned conventional problems.
[0005]
[Means for Solving the Problems] In order to achieve this object, the speaker according to the
present invention includes electromagnetic components, in particular vibration-based
components, of the speaker components, and is reduced to a potential having a shielding effect
to reduce electromagnetic radiation from the speaker. Noise is reduced.
[0006]
[Operation] According to this configuration, the noise that has been radiated from the voice coil
serving as the antenna due to the current flowing in the conventional speaker voice coil leaks as
it is, but in the present invention, the portion from the voice coil to the front of the speaker That
is, since the vibration system component is a conductive component and is configured to be
dropped to a potential having an electromagnetic shielding effect including other components,
radiation from the voice coil to the outside of the speaker can be reduced.
[0007]
Embodiments of the present invention will be described hereinbelow with reference to the
drawings.
[0008]
FIG. 1 is a cross-sectional view of a speaker showing a first embodiment of the present invention.
1 is a voice coil bobbin, 2 is a dust cap, 3 is a diaphragm, 4 is a damper, 5 is an edge, 6 is a
frame, 7 is a voice coil wound in a state of being insulated by the voice coil bobbin 1, 8 is a field
section The voice coil bobbin 1, the dust cap 2, the diaphragm 3, the damper 4, the edge 5 and
the frame 6 are each made of a material having conductivity, and the respective joint portions
are fixed by the conductive adhesive 9. .
By attaching the frame 6 to a car body iron plate or the like by screwing, the entire vibration
system component which is conducting through the screw 10 can be dropped to the ground, and
the electromagnetic by the current flowing through the voice coil 7 Leakage of radiation to the
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front of the speaker can be reduced.
[0009]
FIGS. 2A and 2B show an example of the effect, in which the vibration system parts are grounded,
and the level is improved by about 17 dB as compared to the case where the earth is not taken.
FIG. 2 (a) shows the radiation noise characteristic of the speaker having a configuration in which
the vibration system components are not dropped to ground, and FIG. 2 (b) shows the radiation
noise characteristic of the speaker having a configuration in which the vibration system
components of the present invention are dropped to ground. There is.
[0010]
In addition, as a bonding means, a pressure welding means such as an eyelet is also possible.
FIGS. 3A and 3B show this embodiment. In order to facilitate caulking, a part of the dust cap 2 is
made into a stretched tongue portion 2a, and caulked with the diaphragm 3 and the eyelet 11 to
fix and electrically conduct the dust cap 2 and the diaphragm 3.
[0011]
Moreover, fitting of parts is also possible as a joining means. FIGS. 4A and 4B show this
embodiment. The protrusion 2b of the dust cap 2 is press-fit into the hole portion 1a of the voice
coil bobbin 1 by press fitting, and the fitting is performed to fix and electrically conduct both.
[0012]
Moreover, it is also possible to utilize the spring property of components as a joining means. 5 (a)
and 5 (b) show this embodiment. An elastic tongue piece 1b is provided at the upper end portion
of the voice coil 1. When the dust cap 2 is fixed thereon, the elastic tongue piece 1b is in
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pressure contact with the inner surface of the dust cap 2 so that contact is obtained. .
[0013]
Moreover, it is also possible to use means, such as soldering welding, as a joining means. FIGS.
6A and 6B show this embodiment. A protrusion 1 c on the upper surface of the bobbin 1 made of
aluminum protrudes from the square hole 2 c of the dust cap 2 made of aluminum, and the
protrusion 1 c is connected by solder 12.
[0014]
Moreover, welding means, such as ultrasonic welding, is also possible as a joining means. FIGS.
7A and 7B show this embodiment. The dust cap 2 made of a conductive resin and the diaphragm
3 are welded at a joint point 13.
[0015]
Moreover, a crimping ¦ compression-bonding means is also possible as a joining means. FIGS. 8A
and 8B show this embodiment. The metal dust cap 2 and the voice coil bobbin 1 are provided
with tongue-shaped crimping projections 1d and 2d, and the crimping projections 1d and 2d are
crimped.
[0016]
It is also possible to use a conductive magnetic fluid as the bonding means. FIG. 9 shows this
embodiment. By using the conductive magnetic fluid 14 in the magnetic gap 8a of the field
section 8, conduction between parts wetted with it, that is, conduction between the voice coil
bobbin 1, the field section 8, and the frame 6 becomes possible. .
[0017]
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FIG. 10 shows an embodiment in which the terminal portion and the vibrating portion are
electrically connected. One of the gold wire 16 is soldered to the eyelet 15 crimped to the
diaphragm 3 and the other is soldered to the terminal terminal 17. It is taking. By connecting the
ground wire 18 to the terminal terminal 17, the diaphragm 3 is grounded.
[0018]
11 (a) and 11 (b) show an embodiment in which the fixing of the terminal 19 to the frame 6 is
crimped with the eyelet 20, and one of the gold wire 16 electrically connected to the vibrating
portion is soldered thereto. It shows.
[0019]
FIG. 12 shows an embodiment in which the eyelet 20 doubles as the terminal terminal 17 in the
embodiment of FIG.
[0020]
FIG. 13 shows an embodiment in which the terminal mounting portion 21 of the frame 6 doubles
as a terminal in the embodiment of FIG.
[0021]
FIG. 14 shows an embodiment in which the connection from the vibration unit is taken to either
the hot or cold terminal of the terminal 17 for connecting the input signal.
By soldering one end of the gold wire 16 to the eyelet 15 crimped to the diaphragm 3 and
soldering the other to the terminal terminal 17 of the input signal, it can be connected to a hot or
cold potential, and the radiation suppression effect is can get.
[0022]
FIGS. 15 (a) and 15 (b) show an embodiment in which the voice coil bobbin 1 is connected.
In order to connect the aluminum voice coil bobbin 1 to one potential of the input signal, first, a
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window 23 is provided in a part of the reinforcing paper 22 of the voice coil bobbin 1 and the
voice coil bobbin 1 is cut and raised 24 by the window 23. Provide
It is possible to connect the voice coil bobbin 1 to the signal line potential by caulking or
soldering both the voice coil wire 25 and the gold wire 16 to the cut and raised portion 24. As
for the other signal line, the voice coil line 25 and the gold wire 16 may be crimped or soldered
and bonded on the insulating reinforcing paper 22 as in the prior art.
[0023]
16 (a) and 16 (b) show an example in which the eyelet 15 is crimped to the diaphragm 3 and the
voice coil wire 25 and the gold wire 16 are connected at the eyelet 15. In the conventional
method, the input signal is As shown in FIG. 16A, an insulating spacer 26 is provided between
the conductive portion and the voice coil so as not to flow other than the voice coil. In the
present invention, by omitting one of the insulating spacers 26 as shown in FIG. 16 (b), the
diaphragm 3 can be dropped to the hot or cold potential of the signal line. When it can be
ignored (about 10 times or more) compared to the speaker impedance, the level drop due to
signal leakage is 1 dB or less, as shown by the following equation, even if both insulating spacers
26 are omitted.
[0025]
Because of this, it is sufficiently practical level, and omission will make it easier to realize. In
addition, although the description in a specific part was shown in the Example, it is needless to
say that it is effective similarly about another part and a construction method.
[0026]
As described above, according to the present invention, since the speaker component,
particularly the vibration system component, is structured to be able to be dropped to a potential
having a shielding effect, the voice coil is an antenna as in the prior art. While the
electromagnetic radiation noise is left outside the speaker as it is, an excellent speaker capable of
significantly reducing the noise can be realized.
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