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JPH0546197

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DESCRIPTION JPH0546197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus having a plurality of speaker bodies.
[0002]
2. Description of the Related Art Conventionally, as a speaker device having a plurality of speaker
bodies of this type and outputting sounds in different frequency bands, for example, the
configuration disclosed in Japanese Patent Publication No. 58-11111 is known. .
[0003]
The speaker apparatus disclosed in Japanese Patent Publication No. 58-11111 connects a
dividing network to each speaker body, cuts different frequency bands, and makes the
reproduction frequency bands outputted from each speaker body different. It is a thing.
[0004]
In general, in this dividing network, for example, in the case of a 3-way speaker device, reactance
elements having different values are connected by tweeters, midranges and woofers, respectively,
and low cut or high cut is performed respectively. .
[0005]
In a high-pass filter, or low cut, used for a tweeter, a capacitive reactance element is connected to
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the voice coil of the speaker main body. This reactance element has a small loss, a small current
capacity, and no induction. Being a mold and having a low capacitance error are desired.
[0006]
However, a capacitor as a reactance element to be used in practice has series resistance and
leakage current, and when the capacity becomes large, it is difficult to make a non-inductive
capacitor, and the electrode itself has inductive reactance. Resulting in.
Therefore, the capacitance changes depending on the frequency, which directly affects the output
sound pressure frequency characteristic, the phase characteristic, and the like.
[0007]
On the other hand, in the low pass filter used for the woofer, that is, high cut, an inductive
reactance element such as an inductor is connected to the voice coil of the speaker main body,
and it is desirable that this reactance element has no direct current resistance.
[0008]
However, it is impossible that there is no direct current resistance in the inductor, and the direct
current resistance causes losses, reduces the electromagnetic braking force of the speaker body,
and deteriorates the transient characteristics.
Furthermore, when the core is inserted into the inductor to reduce the direct current resistance,
the permeability may change depending on the input depending on the core, and distortion is
likely to occur because the magnetic saturation point is low.
[0009]
Further, in the mid range, in order to perform low cut and high cut by a band pass filter, an
inductor and a capacitor are connected, and similarly, the above-mentioned is desired.
[0010]
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As described above, when an inductor or a capacitor is connected to the signal path of the voice
coil of the speaker main body, the output sound pressure characteristic, the phase characteristic
may be deteriorated, distortion may occur, etc. It has the problem of causing sound quality
deterioration.
[0011]
The present invention has been made in view of the above problems, and an object of the present
invention is to provide a speaker device with improved sound quality.
[0012]
A speaker apparatus according to the present invention comprises a plurality of speaker bodies
and a plurality of driving coils for driving the speaker bodies, and a voice coil respectively
connected to the speaker bodies. And a reactance element connected to the drive coil excluding
at least one of the plurality of drive coils of the voice coil.
[0013]
In the present invention, a reactance element is connected to a drive coil except at least one of a
plurality of drive coils of a voice coil connected to a speaker body to apply a reverse force. By
cutting the frequency of the predetermined band, the reproduction frequency region reproduced
by the speaker main body can be made different, and since the reactance element is not
connected to at least one or more driving coils serving as a signal path. , Inferior sound quality
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, a
two-way system of one embodiment of a speaker apparatus according to the present invention
will be described.
[0015]
In FIG. 2, reference numeral 1 denotes a closed type enclosure, and a baffle plate 2 provided on
the front surface of the enclosure 1 is attached with a tweeter St and a woofer Sw which are
speaker bodies.
[0016]
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Further, as shown in FIG. 3, these tweeter St and woofer Sw sandwich the magnet 6 between the
back plate 3 and the top plate 5 having the opening 4 at the center, and the top plate at the
center of the back plate 3 A center pole 7 is mounted opposite the opening 4 of 5.
Then, a voice coil bobbin 8 is positioned around the center pole 7 with a gap, and as shown in
FIG. 4, the first drive coil 9 and the second drive coil are disposed on the voice coil bobbin 8. A
voice coil 11 consisting of 10 is wound.
[0017]
Further, in the tweeter St and the woofer Sw configured in this way, the first drive coils 9t and
9w are connected to the connection terminals 12 attached to the rear of the enclosure 1, and the
second drive coil 10t is used. , 10 w are connected to the LC connection board 13.
[0018]
The circuit is as shown in FIG. 1, and the connection terminal 12 is connected to the first drive
coils 9t and 9w of the voice coils 11t and 11w of the tweeter St and the woofer Sw, respectively.
Further, the second drive coils 10t and 10w magnetically coupled to the first drive coils 9t and
9w are the inductor L1 or the capacitive element as an inductive reactance element attached to
the LC connection board 13. The capacitor C1 as a reactance element of is connected in series to
the connection terminal 12 to form a low pass filter and a high pass filter.
[0019]
When the winding directions of the first drive coils 9t and 9w and the second drive coils 10t and
10w with respect to the voice coil bobbin 8 are the same, inductors are used as shown in FIG. 5
or FIG. When L1 or the capacitor C1 is connected and the winding directions of the first drive
coils 9t and 9w and the second drive coils 10t and 10w with respect to the voice coil bobbin 8
are different, as shown in FIG. As inductor L1 or capacitor C1
[0020]
Then, an audio signal is input from the connection terminal 12, and the tweeter St and the
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woofer Sw are driven and reproduced by the first drive coils 9t and 9w.
In addition, the second drive coil 10t of the tweeter St generates a force in the opposite direction
to perform low-cut, centering on the mid-high range playback, and the second drive coil 10w of
the woofer Sw in the opposite direction. It is generated and high cut is performed mainly on the
reproduction of the low range.
[0021]
Next, with regard to the experimental results showing comparison with the conventional example
in the case of using the second drive coil,
[0022]
When the inductor L1 is connected to the second drive coil 10t, it has a frequency characteristic
as shown by the solid line in FIG. 9, and the level lower than the middle low range is lower than
the broken line showing the conventional example. It can be confirmed that the reproduction
below the middle to low range is braked by the second driving coil 10t to which the inductor L1
is connected.
[0023]
On the other hand, when the capacitor C1 is connected to the second drive coil 10w, it has a
frequency characteristic as shown by the solid line in FIG. Thus, it was confirmed that the
reproduction below the middle and high frequencies was braked by the first drive coil 9w to
which the capacitor C1 was connected.
[0024]
As another embodiment, a three-way system will be described with reference to FIG.
[0025]
The embodiment shown in FIG. 11 is the embodiment shown in FIG. 1 to which is added a mid
range Sm for reproducing around a mid band as a speaker main body.
That is, the first drive coil 9m for the mid range Sm is connected to the connection terminal 12,
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the second drive coil 10t is magnetically coupled to the first drive coil 9m, and the voice coil
11m is The second drive coil 10t is connected to a series circuit LC of an inductor L2 and a
capacitor C2 constituting a reactance element and connected to a connection terminal 12 to
constitute a band pass filter for cutting high and low frequency bands. .
[0026]
Then, an audio signal is inputted from the connection terminal 12, and the tweeter St, the mid
range Sm and the woofer Sw are driven and reproduced by the first drive coils 9t, 9m and 9w.
Also, low cutting is performed by the second driving coil 10t of the tweeter St to perform high
frequency reproduction mainly, and high cutting and low cutting are performed by the second
driving coil 10m of the mid range Sm, and middle range reproducing is central Then, the second
drive coil 10w of the woofer Sw is subjected to a high cut to mainly reproduce the low range.
[0027]
According to the speaker device of the present invention, the reactance element is connected to
the drive coil excluding at least one of the plurality of drive coils of the voice coil connected to
the speaker main body. By applying a force in the reverse direction to cut the frequency of the
predetermined band, the reproduction frequency range reproduced by the speaker main body
can be made different, and the reactance element is at least one or more driving coils serving as a
signal path. Because it is not connected to, constant loss etc. can be prevented and deterioration
of sound quality can be prevented.
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