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JP2011120277

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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 JP2011120277
The present invention provides an acoustic diaphragm and a speaker capable of enriching the
sound field expression and having excellent reproduction characteristics of bass when natural
wood (wood sheet) is used as the diaphragm. SOLUTION: A wooden diaphragm 5 and a wooden
diaphragm 5 are disposed on the surface of the wooden diaphragm 5 along a first direction
passing through the center of the wooden diaphragm 5, and the wooden diaphragm 5 generates
sound in the plane of the wooden diaphragm 5. And propagation speed adjusting members 73a
and 73b for adjusting the propagation speed for propagating the light. [Selected figure] Figure 9
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
With the advent of high-quality digital content such as DVD audio and super audio CD (SACD),
development of a speaker system capable of reproducing the original quality of the content
without excess is required.
[0003]
As a diaphragm material mounted on such a speaker system, uniform materials such as paper,
plastic, metal and the like are widely used.
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1
[0004]
However, when a uniform material is used as the diaphragm material, the sound propagation
speed is equal in all directions, so standing waves are likely to be generated and the sound field
representation may be inferior.
[0005]
As a diaphragm that enriches the sound field expression, for example, an oval-shaped diaphragm
is known.
The “oblique type diaphragm” is a diaphragm in which the cross-sectional shape is
asymmetrical by shifting the position of the voice coil from the center of the diaphragm.
By making the cross-sectional shape asymmetric, it is possible to disperse the resonance and
reduce the peak appearing in the high-pass characteristic, so that a more natural reproduced
sound can be obtained.
[0006]
However, since the oblique type diaphragm is complicated in shape as compared with a general
diaphragm, it is difficult to manufacture.
Moreover, since the oblique type diaphragm has a bias in directivity, there is also a thing that
sound is hard to come out to the front.
Furthermore, when the oblique type diaphragm is used, although the characteristics of the
middle and high tones are improved, the improvement of the characteristics of the bass may not
be sufficient compared with that.
[0007]
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On the other hand, a wood cone type diaphragm using natural wood is also known as another
diaphragm that enriches the sound field expression. The wood cone type diaphragm has different
propagation speeds of sound in the fiber direction and directions other than the fiber direction,
so that standing waves do not occur, and sound field expression and bass energy are also good. A
wood cone type diaphragm is described in, for example, Patent Document 1.
[0008]
JP 2004-254013 A
[0009]
When natural wood (wood sheet) is used as the diaphragm, the appearance of an acoustic
diaphragm that can enrich the sound field expression and is excellent in bass reproduction
characteristics is desired.
[0010]
Therefore, an object of the present invention is to provide a speaker which can enrich the sound
field expression and is also excellent in bass reproduction characteristics.
[0011]
In order to achieve the said objective, it consists of a means as described in following 1)-4).
1) A wooden diaphragm, and a first predetermined area along a first direction passing through
the center of the wooden diaphragm on the first surface of the wooden diaphragm, the surface of
the wooden diaphragm A first propagation velocity adjusting member for adjusting propagation
velocity at which sound propagates, and the first propagation velocity adjusting member on a
surface of a second surface of the wooden diaphragm facing the first surface An acoustic
diaphragm including a second propagation velocity adjusting member disposed in a second
predetermined area of the opposite position and adjusting a propagation velocity at which sound
propagates in the plane of the wooden diaphragm; And a cabinet for containing.
2) The speaker according to claim 1, wherein the first and second propagation velocity adjusting
members are formed of a material having a sound propagation velocity faster than that of the
wooden diaphragm.
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3) The speaker according to claim 1 or 2, wherein the second propagation speed adjusting
member is formed of an anisotropic material. 4) The speaker according to claim 3, wherein the
second propagation velocity adjusting member is a wooden sheet.
[0012]
According to the present invention, it is possible to enrich the sound field expression and obtain
excellent bass reproduction characteristics.
[0013]
It is a perspective view showing a speaker concerning a 1st embodiment of the present invention.
It is a sectional view of a speaker unit concerning a 1st embodiment of the present invention. It is
the schematic which shows the example of a pattern of the standing wave suppression member
which concerns on the 1st Embodiment of this invention. Fig.4 (a)-FIG.4 (c) are sectional
drawings which show the example of fixation of the standing wave suppression member which
concerns on the 1st Embodiment of this invention. It is explanatory drawing showing the
measuring method of the directional sensitivity characteristic which concerns on the 1st
Embodiment of this invention. It is a graph showing the measurement result of the directivity
pattern which concerns on the 1st Embodiment of this invention. It is a perspective view showing
the speaker concerning a 2nd embodiment of the present invention. It is the schematic which
shows the example of a pattern of the standing wave suppression member which concerns on the
2nd Embodiment of this invention. It is a perspective view showing a speaker concerning a 3rd
embodiment of the present invention. It is the schematic which shows the example of a pattern of
the standing wave suppression member which concerns on the 3rd Embodiment of this
invention. It is an explanatory view showing the measuring method of the directional sensitivity
characteristic concerning a 3rd embodiment of the present invention. It is a graph showing the
measurement result of the directivity pattern which concerns on the 3rd Embodiment of this
invention. It is a perspective view showing the speaker concerning a 4th embodiment of the
present invention. It is the schematic which shows the example of a pattern of the standing wave
suppression member which concerns on the 4th Embodiment of this invention. It is a graph
showing the measurement result of the directivity pattern which concerns on the 4th
Embodiment of this invention. It is a perspective view showing the speaker concerning a 5th
embodiment of the present invention. It is a perspective view showing a speaker unit concerning
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a 5th embodiment of the present invention. It is a graph showing the measurement result of the
directivity pattern which concerns on the 5th Embodiment of this invention. It is a graph showing
the measurement result of the directivity pattern which concerns on the 5th Embodiment of this
invention. It is a perspective view showing a speaker concerning a 6th embodiment of the
present invention. It is a perspective view showing the cabinet concerning a 6th embodiment of
the present invention. It is a perspective view showing the speaker concerning a 7th embodiment
of the present invention. FIG. 23 (a) is a plan view showing a diaphragm according to a seventh
embodiment of the present invention, and FIG. 23 (b) is a cross-sectional view showing the
diaphragm according to the sixth embodiment of the present invention. is there. FIGS. 24 (a) to
24 (g) are plan views showing an arrangement example of a standing wave suppressing member
according to a seventh embodiment of the present invention. It is a perspective view showing the
speaker concerning other embodiments of the present invention.
[0014]
Next, embodiments of the present invention will be described with reference to the drawings. In
the following description of the drawings, the same or similar parts are denoted by the same or
similar reference numerals. The embodiment shown below exemplifies an apparatus and a
method for embodying the technical idea of the present invention, and the technical idea of the
present invention describes the structure, arrangement, and the like of components. It is not
specific to
[0015]
First Embodiment A speaker 100a according to a first embodiment of the present invention, as
shown in FIG. 1, is mounted on a cabinet 1 having a unit mounting port 2 on the front and a unit
mounting port 2. A speaker unit 3 is provided.
[0016]
The speaker unit 3 includes, for example, as shown in FIG. 2, a magnetic circuit 34, a frame 33
disposed on the magnetic circuit 34, and a diaphragm 5 fixed to the frame 33.
The magnetic circuit 34 includes a toroidal plate 35, a toroidal magnet 36 provided below the
plate 35, and a pole piece 30. A voice coil 31 a is loosely inserted in the magnetic gap 37
between the plate 35 and the pole piece 30. The damper 32 is bonded to the voice coil bobbin 31
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b and the frame 33.
[0017]
The diaphragm 5 is formed of a uniform material (isotropic material). By "homogeneous material"
is meant a single material with approximately equal sound propagation velocity in all directions
within the diaphragm. Examples of the uniform material include paper such as pulp, plastic such
as polypropylene, and metal such as aluminum. Although the wood cone type diaphragm has a
complicated manufacturing method and a high manufacturing cost, the diaphragm 5 is formed of
a uniform material, so that the diaphragm 5 itself can be easily and inexpensively manufactured.
[0018]
As shown in FIG. 2, the diaphragm 5 has a cone (conical) shape in cross section, and an opening
51 is provided at the center. The opening 51 is provided with a dust cap 38 for preventing
foreign matter from invading the voice coil 31a. A rubber edge or the like is attached to the outer
peripheral portion (edge) 52 of the diaphragm 5 over the entire circumference, and is fixed to the
frame 33 via a gasket 39.
[0019]
On the surface of the diaphragm 5, one set of standing wave suppression members 7a and 7b for
suppressing standing waves generated in the diaphragm 5 is disposed. Let both standing wave
suppression members 7 a and 7 b be the standing wave suppression member 7. As shown in FIG.
1, the standing wave suppressing members 7a and 7b are substantially symmetrical with respect
to the center of the diaphragm 5 in a direction (vertical direction in the drawing) substantially
perpendicular to the bottom surface of the cabinet 1 with the dust cap 38 interposed
therebetween. It is arranged oppositely to become. The thickness of the standing wave
suppression members 7a and 7b is preferably, for example, about 10 μm to 700 μm, in
consideration of the relationship with the total weight of the diaphragm 5.
[0020]
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The shape of the standing wave suppressing members 7a and 7b is not particularly limited, but
for example, a plate or a thin film having a shape as shown in FIGS. 3 (a) to 3 (f) can be used. For
example, as shown in FIG. 3A, by attaching the standing wave suppressing members 7a and 7b in
which the widths L1 and L2 of both ends of the standing wave suppressing members 7a and 7b
are changed to the diaphragm 5, acoustic It is preferable because the change in propagation
speed when used as a diaphragm is larger. なお、0≦L2<L1である。 In particular, a shape
in which the width of the end on the opening 51 side is wider than the width of the end on the
outer peripheral side (for example, FIG. 3A, FIG. 3B, and FIG. 3C) is adopted. Is preferred.
[0021]
As a method of fixing the standing wave suppressing members 7a and 7b, for example, as shown
in the cross-sectional view of FIG. 4A, the standing wave suppressing members 7a and 7b are
attached in close contact with the entire surface of the diaphragm 5. It is preferable to attach it.
As a bonding means, for example, a double-sided pressure-sensitive adhesive tape, a
commercially available adhesive, a thermosetting adhesive, a heat press, or the like can be used.
[0022]
However, as shown in FIG. 4B, depending on the bonding strength of the bonding means and the
material of the diaphragm 5, both ends of the standing wave suppressing members 7a and 7b
may peel off the surface of the diaphragm 5. Even in the example of FIG. 4 (b), the effect is
sufficiently obtained, but more effectively, as shown in FIG. 4 (c), at least the end of the standing
wave suppressing members 7a and 7b on the opening 51 side is It is desirable to fix on the
diaphragm 5 using an adhesive or the like so as to be in close contact with the surface of the
diaphragm 5. Thereby, the vibration transmitted from the voice coil 31a can be easily
transmitted to the standing wave suppressing members 7a and 7b, so that the sense of spreading
of the sound in the sense of hearing is in the direction in which the standing wave suppressing
members 7a and 7b extend. can get.
[0023]
It is preferable that the material of the standing wave suppression members 7a and 7b be a
material having a faster sound propagation speed than the material of the diaphragm 5. For
example, in the case of using paper or polypropylene as the material of the diaphragm 5, for
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7
example, carbon, aluminum, titanium, copper or their alloys can be used as the material of the
standing wave suppressing members 7a and 7b. When a metal such as aluminum is used as the
material of the diaphragm 5, for example, titanium, beryllium, magnesium, or an alloy of these
can be used as the material of the standing wave suppressing members 7a and 7b.
[0024]
According to the acoustic diaphragm according to the first embodiment, as shown in FIG. 1, the
standing wave suppressing member 7a formed of a material having a faster sound propagation
speed than the uniform material constituting the diaphragm 5, 7b is disposed in a direction
passing through the center of the diaphragm 5, that is, in a direction substantially perpendicular
to the bottom surface of the cabinet 1 (in the vertical direction in the drawing). As a result, the
sound velocity in the vertical direction is faster than in the other directions, so that even when a
uniform material such as paper is used as the diaphragm 5, generation of standing waves can be
suppressed, and An auditory sound spreads in a substantially vertical direction, which can
further improve the sense of sound field.
[0025]
Further, according to the acoustic diaphragm of the first embodiment, unlike the obtricone
diaphragm, the opening 51 is not shifted from the center of the diaphragm 5, so that the bass
does not decrease. Further, the standing wave suppressing members 7a and 7b having the
shapes shown in FIG. 3A to FIG. 3F are cut out from the plate-like or film-like raw material, and
are stuck on the surface of the diaphragm 5 with an adhesive or the like. Since the acoustic
diaphragm shown in FIG. 1 can be made only by itself, the processing is simple and inexpensive.
[0026]
In addition, in order to investigate the characteristic of the speaker 100a shown in FIG. 1, the
directivity sensitivity characteristic of the speaker 100a was evaluated by the method as shown
in FIG. As shown in FIG. 5, in the directivity sensitivity characteristic test, the speaker 100a
shown in FIG. 1 was placed on a turn table (not shown) with the speaker 100a turned to the side.
Then, a microphone was placed at a distance of 1 m from the center of the turntable, and the
turntable was rotated 360 degrees clockwise with the front of the speaker 100 a at 0 degrees.
The directivity pattern as shown in FIG. 6 was measured at a measurement frequency of 8 kHz.
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As a comparative example, the directivity pattern of the speaker which does not have standing
wave suppression member 7a, 7b was measured on the conditions similar to the case where the
speaker 100a was measured.
[0027]
As can be seen from the results shown in FIG. 6, the speaker 100a (thick line: with the standing
wave suppressing member) in which the standing wave suppressing members 7a and 7b are
arranged is a speaker (thin wire: with no standing wave suppressing members 7a and 7b). It can
be seen that the level of the sound range is increased by about 3 dB in each area as compared
with the standing wave suppressing member (without the suppression member). As described
above, according to the acoustic diaphragm and the speaker 100a shown in FIG. 1, even when a
uniform material is used as the material of the diaphragm 5, directivity is achieved by arranging
the standing wave suppression members 7a and 7b. It can be seen that the characteristics can be
changed to give a spread of sound in a specific direction.
[0028]
Second Embodiment As shown in FIG. 7, in the speaker 100 b according to a second embodiment
of the present invention, the standing wave suppressing members 7 a and 7 b are substantially
horizontal to the bottom surface of the cabinet 1. It differs from the speaker 100a shown in FIG.
1 in that it is disposed in the (left-right direction in the drawing).
[0029]
The diaphragm 5 is formed of a uniform material.
In FIG. 7, "uniform material" means a single material having approximately equal sound
propagation speeds in all directions in the diaphragm. As the uniform material, for example,
paper such as pulp, plastic such as polypropylene, metal such as aluminum, etc. can be used.
[0030]
The thickness of the standing wave suppressing members 7a and 7b shown in FIG. 7 is
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9
preferably, for example, about 10 μm to 700 μm, in consideration of the relationship with the
total weight of the diaphragm 5. The shape of the standing wave suppressing members 7a and
7b is not particularly limited. For example, as shown in FIGS. 8A to 8F, a shape elongated in one
direction can be used. For example, as shown in FIG. 8E, the width L11 of the end of the standing
wave suppressing members 7a and 7b on the side of the opening 51 adjacent to the voice coil
31a (see FIG. 2) It is preferable to use a shape thinner than the width L12 of the end portion of
the As a result, the vibration generated in the voice coil 31a is easily propagated to the standing
wave suppressing members 7a and 7b, and the characteristic of the propagation speed when
used as a diaphragm is improved.
[0031]
The standing wave suppressing members 7a and 7b shown in FIGS. 8 (a) to 8 (f) are made of, for
example, an adhesive means such as a double-sided adhesive tape, a commercially available
adhesive, a thermosetting adhesive, or a heat press. It may be stuck on the diaphragm 5.
[0032]
As the material of the standing wave suppressing members 7a and 7b, it is preferable to use a
material having a sound propagation speed slower than that of the uniform material constituting
the diaphragm 5.
Therefore, for example, when using paper as a material of the diaphragm 5, plastics, such as a
polypropylene, are utilized as a material of standing wave suppression members 7a and 7b, for
example. When a metal such as aluminum is used as the material of the diaphragm 5, a plastic
such as paper or polypropylene is used as the material of the standing wave suppressing
members 7a and 7b.
[0033]
According to the acoustic diaphragm according to the second embodiment, as shown in FIG. 7,
the standing wave suppressing member 7a formed of a material having a slower sound
propagation speed than the uniform material forming the diaphragm 5, 7b are arranged in a
direction passing through the center of the diaphragm 5 (substantially horizontal with respect to
the bottom of the cabinet 1). As a result, the velocity of sound in the substantially horizontal
direction (the left and right direction in the drawing) is slower than in the vertical direction, so
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that the occurrence of standing waves can be suppressed. In addition, since the sound velocity in
the horizontal direction is slowed, the spread of the aural sound in the vertical direction can be
obtained conversely, so that the acoustic diaphragm and the speaker 100b having a higher sense
of sound field can be obtained.
[0034]
Further, according to the acoustic diaphragm according to the second embodiment, unlike the
obtricone diaphragm, the opening 51 is not shifted from the center of the diaphragm 5, so that
the bass does not decrease. Further, standing wave suppressing members 7a and 7b having
shapes as shown in FIG. 8A to FIG. 8F are cut out from a thin film or plate-like raw material and
attached to the surface of diaphragm 5 with an adhesive or the like. Since the acoustic diaphragm
shown in FIG. 7 can be manufactured only by itself, the processing is easy and inexpensive.
[0035]
Third Embodiment A speaker 100c according to a third embodiment of the present invention is,
as shown in FIG. 9, a cabinet 1 having a unit mounting port 2 and a tweeter mounting port 6 on
the front, and a unit mounting port A speaker unit 3 mounted on the second body 2 and a
tweeter 8 mounted on the tweeter mounting port 6 are provided. Tweeter 8 is not required.
[0036]
The diaphragm 5 shown in FIG. 9 is made of wood, and is mounted on the unit mounting opening
2 so that the fiber direction is substantially perpendicular to the bottom surface of the cabinet 1
(in the vertical direction in the drawing). As wood used for the diaphragm 5, for example, in
addition to conditions such as uniform and small conduit density, short conduit, long wood fiber,
slow growth of summer, etc., ease of forming and acoustic characteristics etc. Natural wood that
satisfies the requirements of For example, it is possible to preferably use a hippo system material
such as mackerel or bamboo birch, a birch wood material, a maple type material such as itayakae
maple, a maple system material such as hard maple, cherries and the like.
[0037]
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11
On the surface of the diaphragm 5, a direction passing through the center of the diaphragm 5,
that is, a pair of propagation speeds disposed in a substantially horizontal direction (horizontal
direction in the drawing) with respect to the bottom of the cabinet 1 Adjustment members 73a
and 73b are disposed. Both of the propagation speed adjustment members 73 a and 73 b are
referred to as a propagation speed adjustment member 73. As described above, when the
diaphragm 5 is made of wood, standing waves are not generated in the diaphragm 5. The
standing wave suppressing member 7 and the propagation speed adjusting member 73 have
substantially the same shape, but the propagation speed adjusting member 73 acts as a member
for adjusting the propagation speed to propagate the sound in the plane of the diaphragm 5. It
will be called a propagation speed adjustment member. The thickness of the propagation speed
adjusting members 73 a and 73 b is preferably, for example, about 10 μm to 700 μm in
consideration of the relationship with the total weight of the diaphragm 5.
[0038]
As a material of the propagation speed adjusting members 73a and 73b, it is preferable to use a
material having a faster sound propagation speed than the diaphragm 5. For example, when
natural wood is used as the propagation speed adjusting members 73a and 73b, for example, as
shown in FIG. 9, a wooden sheet having a fiber direction (for example, left and right direction in
the drawing) different from the fiber direction of the diaphragm 5 is vibrated. It can be stuck on
the surface of the plate 5.
[0039]
The wood sheet used as a material of the diaphragm 5 and the propagation speed adjusting
members 73a and 73b generally has a constant fiber direction. Although the propagation
velocity in the fiber direction of the wood sheet shows a high value, the propagation velocity is
significantly reduced in the direction perpendicular to the fiber orientation. Therefore, when a
wood cone speaker with a large diameter is manufactured using a wooden sheet, the slowness of
the sound propagation speed in the horizontal direction affects the reproduction sound, and it is
difficult for the sound to come forward, and the sound field expression is lacking. It can occur.
[0040]
On the other hand, as shown in FIG. 9, by arranging the propagation speed adjusting members
73a and 73b in a substantially horizontal direction with respect to the bottom surface of the
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12
cabinet 1, the speed of sound in the horizontal direction can be increased. Even when a wood
cone speaker is manufactured, deterioration of reproduced sound due to a delay in propagation
speed in the non-fiber direction can be suppressed, and an acoustic diaphragm and speaker 100c
with a rich sound field expression and good directional characteristics can be provided. .
[0041]
In the third embodiment, a uniform material such as paper or aluminum may be substituted for
the propagation speed adjustment members 73a and 73b.
In addition to natural wood, other anisotropic materials having a fiber direction, for example,
fibrous materials such as carbon and aramid may be used.
[0042]
Further, the shape of the propagation speed adjusting members 73a and 73b is not particularly
limited. For example, as shown in FIGS. 10A to 10F, a plate or a thin film having a shape
elongated in one direction can be adopted. For example, as shown in FIG. 10 (a), the widths L1
and L2 of both ends of the propagation speed adjusting members 73a and 73b are changed, and
FIGS. 10 (b), 10 (c), 10 (e), and FIG. As shown in FIG. 10 (f), when bonding to the diaphragm 5 by
changing the widths of the propagation speed adjustment members 73a and 73b in the
longitudinal direction of the propagation speed adjustment members 73a and 73b, The speed of
sound can be changed. なお、0≦L2<L1である。 Further, in order to make it easier to
transmit the vibration generated by the voice coil 31a, the width of the end on the side of the
opening 51 adjacent to the voice coil 31a is made wider than the width l2 of the other end, as
shown in FIG. 10 (b) and the shape as shown in FIG. 10 (c) may be adopted.
[0043]
According to the acoustic diaphragm according to the third embodiment, as shown in FIG. 9, the
propagation speed adjusting members 73a and 73b formed of a material having a higher
propagation speed than the material constituting the diaphragm 5, The cabinet 1 is disposed
substantially horizontally (in the left-right direction in the drawing) with respect to the facing of
the cabinet 1. As a result, the speed of sound in the horizontal direction of the diaphragm 5 is
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13
increased, so that the delay in the speed of sound in the horizontal direction can be alleviated
even when natural wood (a wooden sheet) which is an anisotropic material is used as the
diaphragm 5 Field expression can be further improved.
[0044]
When natural wood is used as the diaphragm 5, as the outer diameter of the diaphragm is
increased, defects such as cracks are more likely to occur along the fiber direction. According to
the acoustic diaphragm and the speaker 100c shown in FIG. 9, since the propagation speed
adjusting members 73a and 73b are formed in the direction of weak mechanical strength, they
also play a role as a reinforcing material, so cracking or the like of the diaphragm 5 can be
prevented. In particular, the manufacturing yield in the case of manufacturing a diaphragm with
a large diameter can be improved.
[0045]
Further, according to the acoustic diaphragm according to the third embodiment, unlike the
obtricone diaphragm, since the opening 51 is not shifted from the center of the diaphragm 5, the
bass is not reduced. Further, propagation speed adjusting members 73a and 73b having the
shapes shown in FIGS. 10A to 10F are cut out of a plate-like or film-like material, and attached to
the surface of diaphragm 5 with an adhesive or the like. Since the acoustic diaphragm shown in
FIG. 9 can be created by itself, the processing is simple and the cost can be reduced.
[0046]
Here, in order to investigate the characteristics of the speaker 100c shown in FIG. 9, the
directivity sensitivity characteristics of the speaker 100c were evaluated as shown in FIG. In FIG.
11, the speaker 100c shown in FIG. 9 is placed as it is on a turntable (not shown), and a
microphone is placed at a distance of 1 m from the center of the turntable. The directivity pattern
was measured by rotating the turntable 360 degrees. The measurement frequency was 8 kHz.
The obtained directivity pattern is shown in FIG.
[0047]
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14
As can be seen from the results shown in FIG. 12, by arranging the propagation speed adjusting
members 73a and 73b (thick line: with standing wave suppressing member), compared with the
case without arranging (thin line: without standing wave suppressing member) In particular, it
can be seen that the level of the sound range in the direction of 30 degrees to 120 degrees is
improved by about 5 dB. As described above, according to the acoustic diaphragm and the
speaker 100a shown in FIG. 9, even when natural wood is used as the material of the diaphragm
5, sound can be emitted to the front, and the sound field expression can be further improved.
Can.
[0048]
Fourth Embodiment A speaker 100d according to a fourth embodiment of the present invention
is, as shown in FIG. 13, a cabinet 1 having a unit mounting port 2 and a tweeter mounting port 6
on the front, and a unit mounting port A speaker unit 3 mounted on the second body 2 and a
tweeter 8 mounted on the tweeter mounting port 6 are provided. Tweeter 8 is not required.
[0049]
The diaphragm 5 is formed of a uniform material. In FIG. 13, "uniform material" means a single
material having approximately equal sound propagation speeds in all directions in the
diaphragm. As the uniform material, for example, paper such as pulp, plastic such as
polypropylene, metal such as aluminum, etc. are used.
[0050]
As a material of the standing wave suppressing members 7 a and 7 b in FIG. 13, a material
having anisotropy and having a faster sound propagation speed than the diaphragm 5 is used.
For example, the standing wave suppressing members 7a and 7b in FIG. 13 are wooden sheets,
and the dust cap 38 is interposed so that the fiber direction is substantially perpendicular to the
bottom surface of the cabinet 1 (vertical direction in the drawing). It is stuck on the upper and
lower sides of the board 5. As materials used for the standing wave suppression members 7a and
7b, for example, in addition to conditions such as uniform and small conduit density, short
conduit, long wood fiber, slow growth of summer, etc. Materials which satisfy the conditions such
as ease and acoustic characteristics are preferred. For example, it is possible to preferably use a
12-05-2019
15
hippo system material such as mackerel or birch, a birch wood material, a maple type material
such as itayakae maple, a maple system material such as hard maple, cherries and the like. In
addition to natural trees, other anisotropic materials having different propagation speeds in the
horizontal direction and the vertical direction may be used as the material of the standing wave
suppressing members 7a and 7b.
[0051]
The thickness of the standing wave suppressing members 7a and 7b is preferably about 10 μm
to 700 μm in consideration of the relationship with the total weight of the diaphragm 5. The
shape of the standing wave suppressing members 7a and 7b is not particularly limited. For
example, a plate or a thin film having a shape as shown in FIGS. 14 (a) to 14 (f) can be used. For
example, as shown in FIG. 14 (a), FIG. 14 (b), FIG. 14 (c), FIG. 14 (e), and FIG. By attaching 7 b to
the diaphragm 5, the vibration generated in the voice coil 31 a is easily propagated to the
standing wave suppressing members 7 a and 7 b. In particular, the width of the end on the side
of the opening 51 adjacent to the voice coil 31a is made wider than the width of the other end in
order to facilitate transmission of the vibration generated in the voice coil 31a, as shown in FIGS.
b) The shape as shown in FIG. 14 (c) is particularly preferable.
[0052]
According to the acoustic diaphragm according to the fourth embodiment, as shown in FIG. 13,
the standing wave suppressing member 7a formed of an anisotropic material having a
propagation speed faster than that of the material constituting the diaphragm 5, 7 b are arranged
in a direction substantially perpendicular to the bottom surface of the cabinet 1 (in the vertical
direction in the drawing). As a result, the sound velocity in the vertical direction is faster than in
the other directions, so that the directivity characteristic in the vertical direction is broadened,
and the spread of sound in the vertical direction can be obtained.
[0053]
Further, according to the acoustic diaphragm according to the fourth embodiment, unlike the
obtricone diaphragm, since the opening 51 is not shifted from the center of the diaphragm 5, the
bass is not reduced. Furthermore, standing wave suppressing members 7a and 7b having the
shapes shown in FIGS. 14 (a) to 14 (f) are cut out from a plate-like or film-like material, and
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attached to the surface of diaphragm 5 with an adhesive or the like. Since the acoustic diaphragm
shown in FIG. 13 can be created simply by attaching it, processing is simple and it can be
manufactured inexpensively.
[0054]
Here, in order to investigate the characteristics of the speaker 100d shown in FIG. 13, the
directivity sensitivity characteristics of the speaker 100d were evaluated in the same manner as
the example shown in FIG. As a comparative example, directivity sensitivity characteristics of a
speaker not including the standing wave suppressing members 7a and 7b at all were evaluated.
[0055]
As can be seen from the results shown in FIG. 15, by arranging the standing wave suppressing
members 7a and 7b (thick line: with the standing wave suppressing member), compared to the
speaker (without fine lines: without the standing wave suppressing member) at all. In particular,
it can be seen that the range level in the direction of 0 degrees to 120 degrees is greatly
improved.
[0056]
Fifth Embodiment A speaker 100e according to a fifth embodiment of the present invention is
provided with a cabinet 1, and a speaker unit 3 and a tweeter 8 mounted on the front of the
cabinet 1, as shown in FIG. The surface standing wave suppressing members 7a and 7b disposed
on the front surface of the diaphragm 5, and the back surface standing wave suppressing
members 17a and 17b disposed on the back surface of the diaphragm 5 as shown in FIG. It
differs from the acoustic diaphragms and the speakers 100a to 100d according to the first to
fourth embodiments in that they are provided.
Tweeter 8 is not required.
[0057]
The back surface standing wave suppressing member 17 a is disposed at a position facing the
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17
surface standing wave suppressing member 7 a via the diaphragm 5. The back surface standing
wave suppressing member 17 b which can not be seen from FIG. 17 is disposed at a position
facing the surface standing wave suppressing member 7 a via the diaphragm 5.
[0058]
As materials of the front surface standing wave suppressing members 7 a and 7 b and the rear
surface standing wave suppressing members 17 a and 17 b, those having a propagation speed
faster than that of the diaphragm 5 are used. For example, when using paper or polypropylene as
the material of the diaphragm 5, the materials of the surface standing wave suppressing
members 7a and 7b and the back surface standing wave suppressing members 17a and 17b are,
for example, carbon, aluminum, titanium, copper or Alloys thereof can be used. When a metal
such as aluminum is used as the material of the diaphragm 5, the materials of the surface
standing wave suppressing members 7a and 7b and the back surface standing wave suppressing
members 17a and 17b are, for example, titanium, beryllium, magnesium, or the like Alloys can be
used.
[0059]
When natural wood (wood sheet) is used as the material of the diaphragm 5, the surface standing
wave suppressing members 7a and 7b and the back surface standing wave suppressing members
17a and 17b are as described in the third embodiment. It becomes a propagation speed
adjustment member. As the propagation speed adjusting member, carbon, aluminum, titanium,
copper or their alloys, or other natural wood or anisotropic material having a propagation speed
faster than that of the diaphragm 5 can be used. Others are substantially the same as the acoustic
diaphragm and the speakers 100a to 100d according to the first to fourth embodiments.
[0060]
According to the acoustic diaphragm and the speaker 100e shown in FIGS. 16 and 17, the
surface standing wave suppressing members 7a and 7b and the rear surface standing wave
suppressing members 17a and 17b are disposed on the front and back surfaces of the diaphragm
5, respectively. As a result, the sound velocity in the direction substantially perpendicular to the
bottom surface of the cabinet 1 is faster than in the other directions, so that even when a uniform
material such as paper is used as the diaphragm 5, generation of standing waves can be
12-05-2019
18
suppressed. Sound comes to come out more to the front.
[0061]
Further, in the case where natural wood is used as the diaphragm 5, by forming the surface
propagation velocity adjusting member and the back surface propagation velocity adjusting
member, the acoustic diaphragm and the speaker 100e having a rich sound field expression and
good directivity characteristics can be obtained. Can be provided. Since the mechanical strength
of the diaphragm 5 is increased, it is possible to improve the manufacturing yield particularly
when manufacturing a diaphragm with a large diameter.
[0062]
Furthermore, according to the acoustic diaphragm according to the fifth embodiment, unlike the
obtricone diaphragm, since the opening 51 is not shifted from the center of the diaphragm 5, the
bass is not reduced. Furthermore, the surface standing wave suppressing members 7a and 7b
and the back surface standing wave suppressing members 17a and 17b of the desired shape are
cut out from the plate-like or film-like raw material, and the surface and the back of the
diaphragm 5 are adhesively bonded or the like. Since the acoustic diaphragm shown in FIG. 16
and FIG. 17 can be created simply by pasting, processing is simple and it can be manufactured
inexpensively.
[0063]
Here, in order to investigate the characteristics of the speaker 100e shown in FIG. 16, the
directivity sensitivity characteristics of the speaker 100e were evaluated in the same manner as
the example shown in FIG. As a first comparative example, the directional sensitivity
characteristics of a speaker not including any of the surface standing wave suppressing members
7a and 7b and the back surface standing wave suppressing members 17a and 17b were
evaluated (see FIG. 18). As a second comparative example, directivity sensitivity characteristics of
a speaker provided with only the surface standing wave suppressing members 7a and 7b were
also evaluated (see FIG. 19).
[0064]
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19
As can be seen from the results shown in FIG. 18, by arranging the surface standing wave
suppressing members 7a and 7b and the back surface standing wave suppressing members 17a
and 17b (thick line: with the standing wave suppressing member), a speaker not arranged at all It
can be seen that the tone range levels in the directions of 60 degrees to 120 degrees and in the
directions of 240 degrees to 360 degrees are greatly improved, in particular, compared to the
thin line: no standing wave suppressing member.
[0065]
Further, as can be seen from the results shown in FIG. 19, when the surface standing wave
suppressing members 7 a and 7 b and the back surface standing wave suppressing members 17
a and 17 b are arranged on both surfaces of the diaphragm 5 (thick line: back surface standing
wave suppressing member It can be seen that the range level in the direction of 90 to 150
degrees and in the direction of 240 to 360 degrees is improved as compared with the case where
only the surface is disposed (thin line: no back surface standing wave suppressing member).
[0066]
Sixth Embodiment A loudspeaker 100f according to a sixth embodiment of the present invention
is, as shown in FIG. 20, an amplifier housing portion 4 for housing an amplifier 40 provided at a
central portion and the periphery of the amplifier 40. A cabinet 1 having unit mounting ports 2a
and 2b provided in the speaker unit, and speaker units 3a and 3b mounted on the unit mounting
ports 2a and 2b, respectively.
[0067]
The cabinet 1 is made of wood and, as shown in FIG. 21, is an integrated type that can
accommodate the speaker units 3a and 3b and the amplifier 40 simultaneously.
The distance between the speaker units 3a and 3b is, for example, about 15 to 60 cm.
[0068]
The speaker unit 3a includes a diaphragm 5a and a pair of first standing wave suppressing
members 70a and 70b disposed substantially horizontally (in the left and right direction in the
drawing) with respect to the bottom surface of the cabinet 1 with the dust cap 38a interposed
therebetween. A pair of second standing wave suppressing members 70c and 70d are disposed
in the upper left direction and the lower right direction in the drawing with the dust cap 38a
12-05-2019
20
interposed therebetween.
[0069]
The speaker unit 3b includes a diaphragm 5b and a pair of first standing wave suppressing
members 72a and 72b disposed substantially horizontally (in the horizontal direction in the
drawing) with respect to the bottom surface of the cabinet 1 with the dust cap 38b interposed
therebetween. A pair of second standing wave suppressing members 72c and 72d are disposed
in the upper right direction and the lower left direction in the drawing with the dust cap 38b
interposed therebetween.
[0070]
In FIG. 20, the second standing wave suppressing members 70c and 70d and the second
standing wave suppressing members 72c and 72d pass through the center of the cabinet and are
based on a plane perpendicular to the bottom surface of the cabinet. The positions are adjusted
so as to tilt in opposite directions to each other.
As a result, the sound reproduced from the speaker unit 3a on the left side in the drawing has a
high sound velocity in the diagonally left direction.
On the other hand, in the sound reproduced from the speaker unit 3b on the right side of the
drawing, the sound velocity becomes faster in the diagonally right direction.
[0071]
The diaphragms 5a and 5b are formed of a uniform material or natural wood similar to those
described in the first to fourth embodiments.
When the diaphragms 5a and 5b are formed of natural wood, the standing wave suppressing
members 70a, 70b, 70c, 70d, 72a, 72b, 72c, and 72d are as described in the third embodiment.
It becomes a propagation speed adjustment member.
12-05-2019
21
As the standing wave suppression members 70a, 70b, 70c, 70d, 72a, 72b, 72c, 72d, materials
having a propagation speed faster than that of the diaphragms 5a, 5b are used. For example,
when using paper or polypropylene as the diaphragms 5a and 5b, examples of the material of the
standing wave suppression members 70a, 70b, 70c, 70d, 72a, 72b, 72c, and 72d include carbon,
aluminum, titanium, and copper. Or their alloys etc. can be used. When metal such as aluminum
is used as the material of the diaphragms 5a and 5b, examples of materials of the standing wave
suppression members 70a, 70b, 70c, 70d, 72a, 72b, 72c, and 72d include titanium, beryllium,
magnesium, and the like. Or these alloys can be used. In the case where the fiber direction of the
natural wood used for the diaphragms 5a and 5b is the vertical direction in the drawing, natural
wood or anisotropic material having the fiber direction in the left-right direction in the drawing
can be used.
[0072]
The thickness of the standing wave suppressing members 70a, 70b, 70c, 70d, 72a, 72b, 72c, 72d
is preferably about 10 μm to 700 μm in consideration of the relationship with the total weight
of the diaphragms 5a, 5b. Others are substantially the same as the acoustic diaphragm and the
speakers 100a to 100e described in the first to fourth embodiments.
[0073]
According to the acoustic diaphragm and the speaker 100f according to the sixth embodiment,
the standing wave suppressing members 70a, 70b, 70c, 70d, 72a, 72b, 72c, 72d (or propagation
speed adjusting members) are provided. The propagation speed of sound changes in the plane of
the diaphragms 5a and 5b. By this, even when using a uniform material such as paper,
generation of standing waves can be suppressed, sound field expression can be improved, and
sound can be more fronted, and there is a sense of three-dimensional sense. Sound can be played
back.
[0074]
In particular, since the speaker 100f as shown in FIG. 20 is configured as an integral type in
which the distance between the speaker unit 3a and the speaker unit 3b is relatively short, there
is no stereo feeling and the sound is concentrated in the middle, and the scale feeling There was
a lack of feeling in the sound field. However, for the diaphragm 5a on the left side of the drawing,
12-05-2019
22
the standing wave suppressing members 70a, 70b, 70c, and 70d (or propagation speed adjusting
members) are disposed so that the speed of sound in the left-right direction and the left oblique
direction becomes faster. For the diaphragm 5b on the right side, standing wave suppressing
members 72a, 72b, 72c, 72d (or propagation speed adjusting members) are disposed so that the
sound speeds in the left-right direction and the right diagonal direction become faster. As a
result, even with the integrated speaker 100f having a short distance between the speaker units
3a and 3b, it is possible to reproduce sound having a more three-dimensional effect as compared
with the conventional device.
[0075]
Seventh Embodiment A speaker unit 9 according to a seventh embodiment of the present
invention, as shown in FIG. 22, includes a magnetic circuit 91, a housing portion 92 for housing
the magnetic circuit 91, and a magnetic circuit 91. It comprises a diaphragm 50 having a dome
shape disposed thereon, a strip-like standing wave suppression member 27 disposed on the
surface of the diaphragm 50, and a frame 93 for fixing the diaphragm 50.
[0076]
As the diaphragm 50, silk, cotton, hemp, chemical fiber, a film or the like can be used other than
the uniform material and the wood sheet shown in the first to sixth embodiments.
A cloth edge of a predetermined shape is formed on the outer circumferential portion 54 of the
diaphragm 50 over the entire circumference. The standing wave suppression member 27 is
adhered in a straight line to the dome portion of the diaphragm 50 by an adhesion means as
shown in FIGS. 23 (a) and 23 (b). The thickness of the standing wave suppressing member 27 is
preferably about 10 μm to 700 μm in consideration of the total weight of the diaphragm 50. In
addition, since the curvature of the dome part of the diaphragm 50 is comparatively large,
peeling may occur depending on the bonding strength of the material of the standing wave
suppressing member 27 and the bonding means. Therefore, the width of the band of the standing
wave suppressing member 27 is preferably about 1 mm.
[0077]
The material of the standing wave suppression member 27 can be selected according to the
application. For example, by using a material having a propagation speed faster than that of the
12-05-2019
23
diaphragm 50 as the standing wave suppressing member 27, the speed of sound in the vertical
direction in the drawing of FIG. The auditory sound spread in the direction is obtained. On the
other hand, by using a material having a slower propagation speed than the diaphragm 50 as the
standing wave suppressing member 27, the speed of sound in the vertical direction in the
drawing of FIG. The spread of auditory sound in the left and right direction can be obtained.
Moreover, if anisotropic materials, such as natural wood, are used as the standing wave
suppression member 27, the expansion of the sound different from the case shown to Fig.23 (a)
will be felt. The arrangement pattern of the standing wave suppressing member 27 is not limited
to the example shown in FIG. 24 (a) or 24 (B), and may be a cross shape as shown in FIG. 24 (c),
for example As shown in FIG. 24 (d) to FIG. 24 (g), it may be V-shaped.
[0078]
(Other Embodiments) Although the present invention has been described by the abovementioned embodiment, it should not be understood that the statements and the drawings, which
form a part of this disclosure, limit the present invention. Various alternative embodiments,
examples and operation techniques will be apparent to those skilled in the art from this
disclosure.
[0079]
As shown in FIG. 25, in the first to sixth embodiments, even if the auxiliary member 77 attached
in the same direction as the standing wave suppressing members 7a and 7b is disposed on the
dust cap 38. Good. By arranging the auxiliary member 77, if the material has a propagation
speed faster than that of the dust cap, the directivity characteristics in the vertical direction on
the paper surface become wider, so that the auditory sound spread in the vertical direction on
the paper surface is obtained.
[0080]
In the first to sixth embodiments, an example in which the two standing wave suppressing
members 7a and 7b (or the propagation speed adjusting members 73a and 73b) opposed to each
other with the dust cap 38 interposed therebetween has been described. A single standing wave
suppressing member (or propagation speed adjusting member) extending from the opening 51 to
the outer peripheral portion may be disposed. However, since the weight balance as the
12-05-2019
24
diaphragm 5 is lost, the pair of standing wave suppressing members 7a and 7b (propagation
speed adjusting members 73a and 73b) is set to 1 so as to be symmetrical with respect to the
dust cap 38 in the cross section. It is desirable to arrange in the direction.
[0081]
In the first to sixth embodiments, although a speaker equipped with a full band type speaker and
a tweeter is illustrated, in addition to the tweeter, a midrange, a woofer, etc. are mounted and a
speaker of 2 to 5 structure You may build
[0082]
Thus, it goes without saying that the present invention includes various embodiments and the
like not described herein, and various modifications can be made without departing from the
scope of the invention.
[0083]
Reference Signs List 1 cabinet 2 2a unit mounting port 3, 3a, 3b speaker unit 4 amplifier storage
5, 5a, 5b diaphragm 6 tweeter mounting port 7a 7b 17a standing wave suppressing member 8
tweeter 9 Speaker unit 30 Pole piece 31a Voice coil 31b Voice coil bobbin 32 Damper 33 Frame
34 Magnetic circuit 35 Plate 36 Magnet 37 Magnetic gap 38 Dust cap 39 Gasket 40 Amplifier
50 Vibrator plate DESCRIPTION OF SYMBOLS 51 ... Opening part 52 ... Outer peripheral part 54
... Outer peripheral part 73a, 73b ... Propagation speed adjustment member 77 ... Auxiliary
member 91 ... Magnetic circuit 92 ... Storage part 93 ... Frame 100a-100f ... Speaker
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25
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