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DESCRIPTION JP2005277616

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DESCRIPTION JP2005277616
PROBLEM TO BE SOLVED: To adjust the directivity and the sound pressure to be variable without
incorporating the expensive rotary support and the like, and change the directivity and the
adjustment degree of the sound pressure later according to the installation environment of the
speaker device To provide an equalizer that can be easily done. SOLUTION: The equalizer 25 is
attached to the front of a diaphragm 27 of a speaker unit 23, and gives a constant change in
directivity, sound pressure, frequency characteristics and the like of the speaker unit 23. The
permanent magnet 43 is mounted on the ring portion 41c to be brought into contact with the
frame part 43, and the permanent magnet 43 is detachably fixed to the frame 37 etc. of the
speaker unit 23 so that the mounting direction can be easily changed or replaced. The
adjustment of the directivity, the sound pressure and the frequency characteristic can be made
inexpensively variable. [Selected figure] Figure 3
Loudspeaker device provided with equalizer and equalizer
[0001]
The present invention relates to an equalizer attached to the front of a diaphragm of a speaker
unit to provide a constant change in directivity, sound pressure, frequency characteristics and
the like of the speaker unit, and a speaker device provided with the equalizer.
[0002]
As speaker devices, for example, a woofer for low frequency range, a squawker for medium
frequency range, and a tweeter for high temperature range are provided, respectively, and
reproduction is performed by a dedicated speaker unit for each frequency range to obtain high
over wide frequency range. There is a multi-way speaker device that achieves high-quality
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reproduction.
[0003]
However, when using a plurality of speaker units having different reproduction bands in this
way, if there is a large difference in directivity, output sound pressure level, frequency
characteristics, etc. between the speaker units, for example, depending on the position to be
auditioned, The sound of a part of bands may not be heard, or the sound of a part of bands may
be too strong to be offensive.
[0004]
Therefore, in order to reduce the difference in directivity, output sound pressure level, frequency
characteristics, and the like between the speaker units, it is necessary to adjust the output
characteristics of each speaker unit.
The adjustment of the output sound pressure level and the frequency characteristic can also be
carried out by equipping an amplifier device for outputting the reproduction signal to the
speaker unit with an equalizer circuit for adjusting the reproduction signal.
However, adjustment of directivity can not be performed by electrical processing by the equalizer
circuit.
[0005]
Therefore, for a speaker unit with strong directivity such as a tweeter, an equalizer (also a
diffuser) for adjusting directivity or sound pressure in front of the diaphragm 3 of the speaker
unit 1 as shown in FIG. It is carried out to equip 5).
In FIG. 1, reference numeral 6 denotes an edge for fixing the outer periphery of the diaphragm 3
to the frame 7 of the speaker unit 1.
[0006]
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The illustrated equalizer 5 shields a partial area in front of the diaphragm 3 with a plurality of
crosspieces 5a, and the directivity, the sound pressure, and the frequency by reflection, diffusion,
and absorption of sound by these crosspieces 5a. Adjust the characteristics.
[0007]
Conventionally, as such an equalizer 5, various ones having a structure fixed to the frame 7 of
the speaker unit 1 supporting the magnetic circuit 6 by screwing or bonding or the like have
been developed variously (for example, See diffuser).
[0008]
Japanese Patent Application Laid-Open No. 10-079955
[0009]
However, when the speaker apparatus equipped with the above-described fixed equalizer 5 is
installed in the room, depending on the shape of the room etc., there are many cases where it is
desired to further change the directivity of the tweeter.
In such a case, since the fixed equalizer 5 can not cope with the situation, usually, the installation
direction of the speaker device itself is adjusted or the installation position of the speaker device
is moved.
However, such an adjustment method is not easy when the speaker device is large, and also
causes deterioration of the convergence of the speaker device to a room or the like.
[0010]
Therefore, in the prior art, as shown in FIG. 2, in the tweeter 9 which is equipped with the
equalizer 5 in front of the diaphragm 9a, the direction of the unit can be freely changed as shown
by arrows A, B and C in the figure. It has been proposed to change the directivity by mounting a
joint type rotary support 11 and attaching it to a cabinet (enclosure) of a speaker device via the
rotary support 11.
[0011]
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However, the equipment of the rotary support 11 causes an increase in cost and, at the same
time, the rotary support 11 itself having a movable portion may become a noise source that
generates noise due to resonance although it is slight. The
[0012]
The problem to be solved by the present invention is that the adjustment of directivity by the
fixed equalizer is not variable and occurs in the above-mentioned prior art, and the directivity can
not be changed later according to the installation environment. If a rotary support is provided to
make the directivity of the speaker unit variable, the cost increases, and at the same time, the
problem of being disadvantageous in reducing noise due to resonance can be mentioned as an
example.
[0013]
The equalizer according to claim 1, which is attached in front of the diaphragm of the speaker
unit, gives a constant change in directivity, sound pressure, frequency characteristics, etc. of the
speaker unit, and is outside the front surface of the speaker unit. A permanent magnet is
mounted on the ring portion brought into contact with the peripheral edge, and the permanent
magnet is detachably fixed to a frame or the like of the speaker unit by the permanent magnet.
[0014]
The speaker device according to claim 2 is a speaker device in which the equalizer according to
claim 1 is attached to the front surface of the speaker unit, and the front surface of the
diaphragm is interposed between the equalizer and the diaphragm of the speaker unit. It is
characterized in that it is equipped with a protective net for covering.
[0015]
Hereinafter, preferred embodiments of an equalizer according to the present invention and a
speaker apparatus provided with the equalizer will be described in detail with reference to the
drawings.
FIG. 3 shows a longitudinal sectional view of an embodiment of a speaker apparatus provided
with an equalizer according to the present invention.
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[0016]
The speaker device 21 according to this embodiment is equipped with an equalizer 25 on the
front surface of a dome-shaped speaker unit 23 used as a tweeter for high frequency range, and
between the diaphragm 27 of the speaker unit 23 and the equalizer 25. In addition, the
protection net 29 is equipped.
[0017]
The speaker unit 23 includes the dome-shaped diaphragm 27 described above, a cylindrical voice
coil 31 connected to the outer peripheral edge of the diaphragm 27, and a magnetic circuit 35
having a magnetic gap 33 for accommodating the voice coil 31. And a frame 37 made of
magnetic material for supporting the magnetic circuit 35 and the diaphragm 27.
[0018]
The diaphragm 27 has an edge 38 bonded to the outer periphery thereof, and the outer
peripheral edge of the edge 38 is supported by the frame 37 by being fixed to the edge support
37 a of the frame 37.
[0019]
The magnetic circuit 35 includes a cylindrical center pole 35a disposed on the back side of the
speaker unit 23, a first plate 35b formed by projecting the outer periphery of the base end of the
center pole 35a into a bowl shape, and the first plate An inner periphery of the second plate 35d
is configured to include an annular magnet 35c disposed on 35b and an annular second plate
35d placed on the magnet 35c so as to face the first plate 35b. A gap between the surface and
the outer peripheral surface of the center pole 35 a is a magnetic gap 33 that accommodates the
voice coil 11.
The above magnetic circuit 35 forms an external magnet type magnetic circuit that concentrates
the magnetic flux in the magnetic gap 33, and the voice coil 31 in the central axis direction
indicated by the arrow Y according to the electric signal input to the voice coil 31. To drive.
[0020]
The equalizer 25 is composed of an equalizer main body 41 made of synthetic resin, and a
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permanent magnet 43 adhesively fixed to the equalizer main body 41.
As shown in FIG. 4, the equalizer main body 41 has a substantially circular top plate portion 41a
covering the front of the diaphragm 27, a plurality of connecting arms 41b extending radially
from the outer periphery of the top plate portion 41a, and each connecting arm A ring portion
41c is formed integrally with a tip end 41b of the speaker unit 23, which is in contact with the
front outer peripheral edge (the edge support 37a in the illustrated example) of the speaker unit
23.
[0021]
The permanent magnet 43 has a ring shape and is adhesively mounted on the back surface of the
ring portion 41c, as shown in FIG. 3, and detachably fixes the equalizer main body 41 to the
frame 37.
[0022]
In the equalizer 25 described above, the top plate portion 41a and the connecting arm 41b
disposed in front of the diaphragm 27 function to reflect, diffuse, attenuate, etc. the sound
generated from the diaphragm 27, and the directivity of the speaker unit 23 Give constant
change to sound pressure, frequency characteristics etc.
In the case of the present embodiment, an appropriate inclined surface (twist) is provided on the
surface of the top plate portion 41a and the connecting arm 41b so that the directivity is
changed by rotating the equalizer 25 relative to the frame 37. Good.
[0023]
In addition, the permanent magnet 43 for fixing to the frame 37 has its magnetic pole aligned
with the direction of the magnetic pole of the magnet 35 c constituting the magnetic circuit 35
or is equipped with the magnetic circuit 35 in the opposite direction. A change can be given to
the magnetic flux density formed in the magnetic gap 33, which can also be used for sensitivity
adjustment (i.e., sound pressure level adjustment) of the amplitude operation of the voice coil 31.
[0024]
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The protective net 29 is interposed between the equalizer 25 and the diaphragm 27 so as to
cover the front surface of the diaphragm 27.
This protection net 29 uses a mesh material which allows the passage of sound without affecting
the sound as much as possible, but if necessary, the material, the material or the like may be
provided with a function to suppress the output sound pressure and the like. It may be used as
an aid to the equalizer 25 in consideration of the size of the mesh opening and the like.
However, since the original purpose of the protective net 29 is to protect the diaphragm 27, it is
desirable to use a material having a certain degree of rigidity.
[0025]
The equalizer 25 described above is detachably fixed to the speaker unit 23 by the permanent
magnet 43, and is attached to the diaphragm 27 of the speaker unit 23 by rotating around the
central axis of the diaphragm 27. By changing the directivity, etc., it is possible to change the
directivity, etc., and it can be easily attached and detached. Therefore, the adjustment of the
directivity and the sound pressure is largely changed by replacing it with another equalizer 25
whose specification has been changed. You can also.
That is, adjustment of directivity and sound pressure of the tweeter can be made variable without
incorporating a costly rotary support and the like as in the prior art, and the adjustment of
directivity and sound pressure can be made into the installation environment of the speaker
device. In addition, it can be easily changed later, and a user-friendly equalizer 25 and speaker
device can be provided.
[0026]
In the speaker device 21 according to the present embodiment, the directivity of the equalizer 25
and the adjustment degree of the sound pressure are adjusted according to the installation
environment of the speaker device 21 by changing the mounting direction of the equalizer 25 or
replacing the equalizer 25 or the like. Not only can it be easily changed from the above, but also
when the equalizer 25 is removed from the speaker unit 23 by replacement of the equalizer 25
or the like, the front surface of the diaphragm 27 is covered with the protection net 29, so the
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diaphragm is carelessly It is possible to prevent the diaphragm 27 from being damaged by
touching the user's hand 27.
[0027]
The speaker unit equipped with the equalizer of the present invention is not limited to the domeshaped speaker.
The present invention is also applicable to a cone type speaker and an oval type speaker using an
oval shaped diaphragm.
Further, a speaker for adjusting directivity, sound pressure, frequency characteristics and the like
by the equalizer of the present invention is not limited to the tweeter shown in the above
embodiment.
Furthermore, the invention can be applied to a super tweeter for reproducing only a limited
range of the high range, and a squawker etc. responsible for relatively high range reproduction.
[0028]
It is a perspective view of the speaker unit provided with the conventional equalizer.
FIG. 10 is a perspective view showing a tweeter supporting structure using a conventional
equalizer.
FIG. 1 is a longitudinal sectional view of an embodiment of a speaker apparatus provided with an
equalizer according to the present invention. It is a reverse view of the equalizer shown in FIG.
Explanation of sign
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[0029]
Reference Signs List 21 speaker device 23 speaker unit 25 equalizer 27 diaphragm 29 protection
net 31 voice coil 33 magnetic gap 35 magnetic circuit 37 frame 37 a edge support portion 38
edge 41 a top plate portion 41 b connecting arm 41 c ring portion 41 equalizer main body 43
permanent magnet
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