JP2003111190

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DESCRIPTION JP2003111190
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped tweeter for outputting high-range audible sound and a speaker system using the
same for various types of audio equipment.
[0002]
2. Description of the Related Art There are various types of tweeters used for a multi-way
speaker system. Among them, dome-shaped ones are widely used because of their excellent
directivity characteristics. The dome-shaped tweeter includes a dome-shaped diaphragm having a
spherical surface close to a hemisphere. Furthermore, the dome-shaped tweeter includes a
magnetic circuit composed of a yoke, a magnet and the like for driving the dome-shaped
diaphragm.
[0003]
[0003] As this magnetic circuit, there are an internal magnet type and an external magnet type,
but when cost is important, an external magnet type magnetic circuit using an inexpensive ferrite
magnet is adopted. Become.
[0004]
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In an external magnet dome-type tweeter, a pole provided protruding from the yoke is provided
at a position facing the dome-shaped diaphragm.
Furthermore, a magnet is provided around this pole.
[0005]
Such an external-magnet-type dome-type tweeter is incorporated in a speaker box together with
a woofer that outputs low-range sound to constitute a speaker system.
[0006]
The above-mentioned tweeter and speaker system have the following problems.
A dome-shaped tweeter is a speaker whose shape is circular. That is, in the dome-shaped tweeter
magnetic circuit, a ring-shaped magnet is mounted on a disk-shaped yoke provided with a
cylindrical pole at the center, and a ring-shaped plate is further mounted on the magnet. It is
configured. A magnetic gap is formed between the outer periphery of the pole and the inner
periphery of the ring-like plate, and the dome-shaped diaphragm is fitted in the magnetic gap and
supported so as to be capable of vibrating. Due to these components, the outer shape of the
dome-shaped tweeter necessarily becomes circular along it.
[0007]
When such an external-magnet-type dome-shaped tweeter is incorporated in a speaker box, a
small-diameter dome-shaped tweeter is disposed adjacent to a large-diameter woofer. In other
words, a circular dome-shaped tweeter is arranged for a circular woofer, but since the distance
from the center to the outer edge of the tweeter is the same at any position, let's make it as close
as possible to the woofer Even so, there is a limit.
[0008]
The inability of the dome-shaped tweeter to approach the woofer hinders the miniaturization of
the speaker box, and also restricts the design freedom of the speaker system.
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[0009]
In order to solve this problem, there is a method of miniaturizing a magnetic circuit by adopting
an internal magnetic type magnetic circuit using a magnet having a large coercive force such as
an Nd-Fe-B magnet.
However, this Nd-Fe-B magnet is very expensive, and has the disadvantages of poor machinability
compared to ferrite magnets. In addition, in the internal magnetic type magnetic circuit, if it is
intended to provide a through hole at the center of the magnetic circuit because of the need for
acoustic characteristics, the operation is difficult.
[0010]
The present invention solves the above-mentioned problems, and enables a dome-shaped tweeter
and a speaker system using the dome-type tweeter that make it possible to reduce the distance
from the woofer without using an expensive Nd-Fe-B magnet. Intended to be provided.
[0011]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention
according to claim 1 is a dome-shaped tweeter having an external magnetic magnetic circuit
using a ferrite magnet, wherein the external magnetic magnetic circuit It is a dome-shaped
tweeter characterized in that the outer shape of the magnet, the yoke, and the plate that make up
each are substantially rectangular and formed in a generally elongated shape.
[0012]
According to the above configuration, since the external shapes of the components of the
external magnet type magnetic circuit are all rectangular, the overall shape of the dome type
tweeter can be elongated.
[0013]
According to the second aspect of the present invention, in the dome type tweeter having an
external magnetic type magnetic circuit using a ferrite magnet, the external shape of the magnet,
the yoke and the plate constituting the external magnetic type magnetic circuit are all elliptical or
track A dome shaped tweeter characterized in that it is shaped and formed into a generally
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elongated shape.
[0014]
According to the above configuration, as in the first aspect of the present invention, the overall
shape of the dome-shaped tweeter can be elongated.
[0015]
[0015] The invention of claim 3 is the dome-type tweeter according to claim 1 or 2, wherein the
external magnet type magnetic circuit is configured as a low leakage magnetic circuit provided
with a cancel magnet, and further, the external magnet type magnetic circuit And a shield cover
having an outer shape similar to the outer shape of.
[0016]
According to the above configuration, the outer shape of the shield cover is also made to conform
to the outer shape of the external magnetic type magnetic circuit, so that the overall shape of the
dome shape tweeter is elongated and leaks. Magnetic flux can be reduced.
[0017]
According to a fourth aspect of the present invention, a speaker box, the speaker box provided
with the speaker box, and the high sound speaker using the dome-shaped tweeter according to
any one of the first to third aspects, and the speaker box. A speaker system comprising: a lowpitched speaker provided adjacent to the longitudinal side of the high-pitched speaker.
[0018]
According to the above construction, since the woofer is disposed adjacent to the longitudinal
side of the elongated dome-shaped tweeter, it is possible to use the dome without using an
expensive magnet such as an Nd-Fe-B magnet. The relative positional relationship between the
tweeter and the woofer can be made close.
As a result, it is possible to easily achieve miniaturization of the speaker box by shortening the
longitudinal length of the speaker box that accommodates these speakers.
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In addition, since the allowable range of arrangement is expanded, the degree of freedom in
designing the speaker system is also improved.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention
will be described in detail with reference to the drawings.
A loudspeaker system according to this embodiment is shown in FIG.
The loudspeaker system of FIG. 1 comprises a loudspeaker box 1, a woofer 2 and a dome shaped
tweeter 3.
[0020]
The speaker box 1 is a rectangular parallelepiped box for mounting the woofer 2 and the domeshaped tweeter 3.
The woofer 2 is a speaker that outputs low-range sound, and is attached to the lower side of the
front surface 1A of the speaker box 1.
[0021]
The dome-shaped tweeter 3 is a speaker for outputting high-range sound, and is located above
the front surface 1 A of the speaker box 1.
As shown in FIG. 2, the dome-shaped tweeter 3 includes a frame 31, a shield cover 32, a speaker
body 33, and an input terminal 34.
[0022]
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The frame 31 is attached to the speaker body 33.
The frame 31 is a thin plate having a rectangular shape, and a circular opening corresponding to
the dome-shaped diaphragm is provided at the central portion, and an equalizer is provided to
cover a part of the front surface of the dome-shaped diaphragm It is done.
The frame 31 is provided with a stop hole 31 A and the like for attaching the speaker body 33 to
the front surface 1 A of the speaker box 1. Further, the upper and lower portions of the frame 31
are curved, and an outer curved portion 31B is formed in the upper portion and an inner curved
portion 31C is formed in the lower portion. The diameter of this curve is larger than the diameter
of the woofer 2.
[0023]
A shield cover 32 is attached to the frame 31. The shield cover 32 shields the leakage flux from
the speaker body 33. The input terminal 34 is connected to the voice coil of the speaker body 33,
and drives the speaker body 33 by an input signal applied to the voice coil.
[0024]
The basic configuration of the speaker body 33 is shown in FIG. The speaker body 33 is provided
with an external magnet type magnetic circuit 331, a dome-shaped diaphragm 332 and an edge
333.
[0025]
The external magnet type magnetic circuit 331 comprises a yoke 331A, a pole 331B, a magnet
331C and a plate 331D.
[0026]
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The yoke 331A is for guiding the magnetic flux and has a plate shape.
The yoke 331A has an elongated shape and a substantially rectangular shape with rounded
corners. A cylindrical pole 331B is provided integrally with the yoke 331A at the center of the
yoke 331A. On the yoke 331A, a plate-like magnet 331C having a circular hole with a diameter
larger than that of the pole 331B penetrating the pole 331B at the center is attached. The
magnet 331C is made of ferrite and has a substantially rectangular shape similar to that of the
yoke 331A.
[0027]
On the magnet 331C, a plate-like plate 331D for guiding a magnetic flux is attached. The plate
331D has a substantially rectangular shape with rounded corners, similar to the yoke 331A and
the magnet 331C. A circular hole having a diameter larger than that of the pole 331B is provided
at the central portion of the plate 331D, and a magnetic gap is formed between it and the outer
peripheral wall of the pole 331B. Then, as shown in FIG. 4, the area S1 of the plate 331D is set as
follows. That is, the speaker for the high frequency range of the conventional type satisfying the
predetermined characteristics is the speaker main body 51. At this time, it is assumed that the
plate 511 of the speaker main body 51 has an area S2. Then, when the plate 331D is compared
with the plate 511, the plate 331D is made such that the area S1 of the plate 331D is the area S2
of the plate 511 and S1 ≒ S2.
[0028]
Similarly, the areas of the yoke 331A and the magnet 331C are determined to produce the yoke
331A and the magnet 331C.
[0029]
At the center of such a plate 331D, a circular hole is formed between the outer wall of the pole
331B and the circular magnetic gap 331D1.
[0030]
The dome-shaped diaphragm 332 has a coil 3321 on the side wall at the end.
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The coil 3321 is electrically connected to the input terminal 34 by a tinsel wire (not shown).
The coil 3321 is embedded in the magnetic gap 331D1. Also, the dome-shaped diaphragm 332
has its peripheral edge held by the edge 333 so as to be able to vibrate.
[0031]
With such a structure, when an electric signal is applied to the input terminal 34, the domeshaped diaphragm 332 vibrates and the dome-shaped tweeter 3 outputs a sound.
[0032]
The dome-shaped tweeter 3 is arranged with respect to the speaker box 1 as follows.
When the dome-shaped tweeter 3 is attached to the upper side of the speaker box 1, the outer
curved portion 31 </ b> B of the frame 31 is arranged to be positioned upward with respect to
the speaker box 1.
[0033]
On the other hand, the woofer 2 is arranged with respect to the speaker box 1 as follows. It is
attached to the lower side of the speaker box 1 so as to be located under the long side of the
dome-shaped tweeter 3.
[0034]
As a result, as shown in FIG. 5A, the distance from the center of the woofer 2 to the center of the
domed tweeter 3 becomes a distance L1. Compared to this, when the dome-shaped tweeter 5
having the conventional type speaker body 51 shown in FIG. 4 is used instead of the domeshaped tweeter 3, the dome from the center of the woofer 2 as shown in FIG. The distance to the
center of the type tweeter 5 is the distance L2.
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[0035]
On the other hand, since the dome-shaped tweeter 3 has a rectangular shape, the distance is L1
<L2. That is, the distance L1 from the dome shape tweeter 3 to the woofer 2 can be shortened by
using the dome shape tweeter 3 as compared to the case where the dome type tweeter 5 of the
conventional type is used. As a result, since the length in the vertical direction of the speaker box
1 is shortened, the speaker box 1 can be lowered and the speaker box 1 can be miniaturized.
[0036]
The same effect can be obtained by using the elliptical magnetic circuit 6 shown in FIG. 6 (a) or
the track-shaped magnetic circuit 7 shown in FIG. 6 (b) instead of the yokes, magnets, and plates
instead of rectangular. You can get it.
[0037]
Further, in addition to the basic configuration shown in FIG. 3, the magnetic circuit can be
configured as a low leakage magnetic circuit in which the magnetic circuit is covered with the
shield cover 32 by adding a cancel magnet below the yoke 331A. Leakage flux can be reduced.
The configuration shown in FIG. 2 is of this configuration.
[0038]
In FIG. 2, the long side of the frame is curved, and as shown in FIG. 1, if the inner curved portion
31C of this frame is arranged along the arc of the outer periphery of the woofer. The tweeter and
the woofer can be brought closer, and the design can also be changed.
[0039]
Although the embodiment of the present invention has been described in detail, the specific
configuration is not limited to this embodiment, and there may be design changes within the
scope of the present invention. Are also included in the present invention.
[0040]
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As described above, according to the invention of claim 1, the external shape of the components
of the external magnet type magnetic circuit is substantially rectangular, so the overall shape of
the dome type tweeter is It can be elongated.
[0041]
According to the second aspect of the present invention, the external shape of each of the
components of the external magnetic type magnetic circuit is elliptical or track-like. It can be
elongated.
[0042]
According to the third aspect of the present invention, the outer shape of the shield cover is
made to conform to the outer shape of the external magnetic type magnetic circuit and has a
shape similar to this, so that the overall shape of the dome shape tweeter is elongated. And, it can
be made magnetic shielding compatible.
[0043]
According to the invention of claim 4, since the woofer is disposed adjacent to the long side of
the elongated dome-shaped tweeter, the expensive magnet such as the Nd-Fe-B magnet is not
used. The relative positional relationship between the dome-shaped tweeter and the woofer can
be made close.
As a result, it is possible to easily achieve miniaturization of the speaker box by shortening the
longitudinal length of the speaker box that accommodates these speakers.
In addition, since the allowable range of arrangement is expanded, the degree of freedom in
designing the speaker system is also improved.
[0044]
Brief description of the drawings
[0045]
1 is a front view showing a speaker system according to an embodiment of the present invention.
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[0046]
2 is a diagram showing a dome-shaped tweeter of FIG. 1, (a) is a front view, (b) is a plan view, (c)
is a right side view.
[0047]
3 is a diagram showing the speaker body of FIG. 2, (a) is a front view, (b) is an II cross-sectional
view of (a).
[0048]
4 is an explanatory view for explaining the area of the plate.
[0049]
5 is an explanatory view for explaining the relationship of the mounting position of the woofer
and the dome shape tweeter.
[0050]
6 is a plan view showing another example of the surface of the speaker body.
[0051]
Explanation of sign
[0052]
DESCRIPTION OF SYMBOLS 1 speaker box 1A front 2 woofer 3, 5 dome shape tweeter 6, 7
magnetic circuit 31 frame 31A stop hole 31B outer side curved portion 31C inner side curved
portion 32 shield cover 33 speaker main body 34 input terminal 331 outer magnetic type
magnetic circuit 331331A yoke 331B pole 331C magnet 331D plate 331D1 magnetic gap 332
dome-shaped diaphragm 3321 coil 333 edge 51 speaker main body 511 plate S1, S2 area L1, L2
distance
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