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JP2005244804

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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
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DESCRIPTION JP2005244804
The present invention provides a diaphragm and a speaker capable of suppressing mutual
interference in a plurality of vibrations and simultaneously increasing the degree of isolation of
the vibrations while achieving cost reduction and downsizing. A magnetostrictive speaker (10)
comprises a diaphragm (12) formed of a single plate-like member, and a plurality of
magnetostrictive vibration devices (14) for driving the diaphragm (12) at multiple points. The
diaphragm 12 is divided into a plurality of regions 12A and 12B, and each region 12A and 12B is
partitioned by a plurality of slits (boundary portions) 18 which can suppress the propagation of
vibration, and the regions 12A and 12B are separated. Each can be vibrated independently.
[Selected figure] Figure 1
Diaphragm and speaker
[0001]
The present invention relates to a diaphragm and a speaker.
[0002]
2. Description of the Related Art There is widely known a speaker in which a diaphragm made of
a single plate member is driven at multiple points by a plurality of vibrators.
[0003]
For example, a multipoint drive type flat speaker 1 shown in FIG. 18 includes a diaphragm 3
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made of a plate-like member whose peripheral portion is fixed to the speaker frame 2, and a
plurality of magnetostrictive speaker drivers for driving the diaphragm 3 at multiple points. 4
and.
The magnetostrictive speaker driver 4 is configured to include a thin-plate shaped
magnetostrictive element 5 and series-wound coils 6A to 6C wound around the magnetostrictive
element 5 at predetermined intervals.
[0004]
In the multipoint drive type flat speaker 1, the plurality of magnetostrictive speaker drivers 4 are
driven in the front-rear direction with respect to the diaphragm 3 by the magnetostrictive lateral
effect, and vibration is performed via the four connection pieces 7 attached to the
magnetostrictive speaker driver 4. The plate 3 is driven at multiple points.
[0005]
JP, 2000-341792, A
[0006]
However, in the multipoint drive type flat speaker 1, the vibrations at the four drive points are
likely to interfere with each other, and the degree of isolation of the vibrations (the degree of the
independence of the vibrations at each drive point) is low.
[0007]
Also, since this multi-point drive type flat speaker 1 originally intended to drive the diaphragm 3
in phase, a plurality of independent diaphragms are required to output multi-channel sound.
There is a limit to cost reduction and miniaturization.
[0008]
The present invention has been made to solve such problems, and it is possible to reduce cost
and size while at the same time suppressing mutual interference in a plurality of vibrations to
achieve isolation of vibrations. An object is to provide a diaphragm and a speaker that can be
enhanced.
[0009]
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As a result of earnest research, the inventor of the present invention has been able to reduce the
cost and reduce the size, and at the same time suppress the mutual interference in a plurality of
vibrations and can increase the degree of isolation of vibrations. I found it.
[0010]
That is, the above object can be achieved by the present invention as described below.
[0011]
(1) It consists of a single plate-like member divided into a plurality of regions, and each region is
partitioned by a boundary portion that can suppress the propagation of vibration, and can be
vibrated independently for each of the regions. A diaphragm characterized by
[0012]
(2) The diaphragm according to (1), wherein the boundary portion includes a plurality of slits
formed in the diaphragm at predetermined intervals.
[0013]
(3) The diaphragm according to (1), wherein the boundary portion is formed of a groove having a
predetermined width in the diaphragm.
[0014]
(4) The diaphragm according to (1), wherein the boundary portion includes a rib provided on a
vibration surface of the diaphragm.
[0015]
(5) The diaphragm according to (1), wherein the boundary portion is configured by sandwiching
and holding the diaphragm from both sides in the thickness direction.
[0016]
(6) The diaphragm according to (1), wherein the boundary portion is configured by arranging an
elastic member in contact with the vibration surface of the diaphragm.
[0017]
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(7) It consists of a single plate-like member divided into a plurality of regions, and each region is
partitioned by a boundary portion that can suppress the propagation of vibration, and can be
vibrated independently for each of the regions. A speaker comprising: a diaphragm; and a
plurality of vibrators disposed individually for each of the regions in the diaphragm and driving
the diaphragm at multiple points.
[0018]
(8) Each of the vibrators is vibrated by different frequencies, and each region of the diaphragm is
divided such that the area becomes larger as the frequency of the corresponding vibrator is
lower. The speaker according to (7).
[0019]
(9) The vibrator is a rod-like magnetostrictive rod having a magnetostrictive member, one end of
which is fixed to the mass member, and the vibrator is disposed on the outer periphery of the
magnetostrictive rod and vibrates the magnetostrictive rod in the axial direction And a drive coil
for driving the speaker according to (7) or (8).
[0020]
(10) The speaker according to (9), wherein the magnetostrictive rod is configured such that the
axial length is longer as the vibration frequency is lower.
[0021]
(11) The speaker according to (9) or (10), wherein the magnetostrictive member is a giant
magnetostrictive member made of a giant magnetostrictive element.
[0022]
(12) The speaker according to any one of (7) to (11), wherein the boundary portion of the
vibrator includes a plurality of slits formed in the diaphragm at predetermined intervals.
[0023]
(13) The speaker according to any one of (7) to (11), wherein the boundary portion of the
vibrating body is formed of a groove having a predetermined width on the diaphragm.
[0024]
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(14) The speaker according to any one of (7) to (11), wherein the boundary portion of the
vibrating body is formed of a rib provided on a vibrating surface of the diaphragm.
[0025]
(15) The speaker according to any one of (7) to (11), wherein the boundary portion of the
vibrating body is configured by sandwiching and holding the diaphragm from both sides in the
thickness direction.
[0026]
(16) The boundary portion of the vibrator is configured by arranging an elastic member in
contact with a vibration surface of the diaphragm, according to any one of (7) to (11). Speakers.
[0027]
According to the diaphragm and the speaker according to the present invention, it is possible to
reduce the cost and reduce the size, and at the same time, suppress the mutual interference in a
plurality of vibrations and improve the isolation of the vibrations. Have.
[0028]
The present invention comprises a single plate-like member partitioned into a plurality of
regions, and each region is partitioned by a boundary portion that can suppress propagation of
vibration, and can be vibrated independently for each of the regions. The above problem is solved
by the above-described diaphragm.
[0029]
Further, it consists of a single plate-like member partitioned into a plurality of regions, and each
region is partitioned by a boundary portion that can suppress the propagation of vibration, and
can be vibrated independently for each of the regions. The same problem as described above is
solved by a speaker comprising a diaphragm and a plurality of vibrators arranged individually for
each of the regions in the diaphragm and driving the diaphragm at multiple points. It is.
[0030]
Hereinafter, magnetostrictive speakers according to Embodiments 1 and 2 of the present
invention will be described in detail with reference to FIGS. 1 to 4.
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[0031]
As shown in FIG. 1 and FIG. 2, the magnetostrictive speaker 10 according to the first embodiment
of the present invention includes a diaphragm 12 made of a single plate-like member and two
magnetostrictions for driving the diaphragm 12 at multiple points. And a vibrating device
(vibrating body) 14.
[0032]
The peripheral portion of the diaphragm 12 is fixed to the speaker frame 16 of a substantially
frame-like body.
Also, the diaphragm 12 is divided into two regions 12A and 12B.
Each of the regions 12A and 12B is partitioned by a plurality of slits 18 formed in the diaphragm
12 at predetermined intervals, and the plurality of slits 18 are used as boundaries to suppress
the propagation of each other's vibration.
In addition, as a material of the diaphragm 12, for example, wood, glass, plastic, paper or the like
can be applied.
[0033]
The magnetostrictive vibration device 14 includes a mass member 22 accommodated in a
substantially cylindrical casing 20, a substantially rod-shaped giant magnetostrictive rod 24
formed of a giant magnetostrictive member, one end of which is fixed to the mass member 22,
and the giant magnetostrictive rod 24 includes a drive coil 26 disposed so as to surround the
outer periphery of the coil 24, and a transmission rod 28 for transmitting the vibration of the
giant magnetostrictive rod 24 to the diaphragm 12, the vibration direction of which is vibration
It is disposed substantially orthogonal to the vibration plane of the plate 12.
[0034]
The mass member 22 is for causing displacement due to the expansion and contraction to occur
only on the diaphragm 12 side when the giant magnetostrictive rod 24 is extended and
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contracted.
Incidentally, the mass member 22 is a member having a mass which hardly vibrates even if the
giant magnetostrictive rod 24 is driven to expand and contract and generate vibration, for
example, a mass having at least about 100 to 200 times the mass of the giant magnetostrictive
rod 24. It is preferable to apply.
[0035]
The giant magnetostrictive rod 24 fixed to the mass member 22 is formed of a giant
magnetostrictive member made of a giant magnetostrictive element.
Here, the "super magnetostrictive element" refers to a magnetostrictive element made of a
powder sintered alloy or a single crystal alloy containing a rare earth element and / or a specific
transition metal as a main component (for example, terbium, dysprosium, iron, etc.) And has the
property of causing a large displacement when an external magnetic field is applied.
[0036]
The drive coil 26 can apply a predetermined coil magnetic field in the axial direction of the giant
magnetostrictive rod 24, and can change the coil magnetic field applied to the giant
magnetostrictive rod 24 according to an input signal.
[0037]
The transmission rod 28 includes a substantially disc-like flange portion located on the free end
side of the giant magnetostrictive rod 24 and a rod portion extending along the axial direction of
the giant magnetostrictive rod 24 with the flange portion serving as a base end. ing.
A part of the transmission rod 28 protrudes to the outside of the casing 20, and the axial
vibration of the giant magnetostrictive rod 24 can be transmitted to the diaphragm 12 through
the transmission rod 28.
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[0038]
Next, the operation of the magnetostrictive speaker 10 will be described.
[0039]
When a signal of a predetermined frequency is input to the drive coil 26, the magnitude of the
coil magnetic field applied to the giant magnetostrictive rod 24 is changed by this signal.
As a result, displacement in the axial direction occurs in the giant magnetostrictive rod 24 due to
the magnetostrictive effect, and the giant magnetostrictive rod 24 repeats expansion and
contraction in the axial direction at a predetermined frequency to vibrate.
The vibration of the giant magnetostrictive rod 24 is transmitted to the diaphragm 12 via the
transmission rod 28, and a sound is output from the diaphragm 12.
[0040]
By the way, although the diaphragm 12 of the magnetostrictive speaker 10 is driven at multiple
points by the two magnetostrictive vibration devices 14, since the diaphragm 12 is divided into
two regions 12A and 12B by the plurality of slits 18, The propagation of vibration between the
regions 12A and 12B is suppressed.
Therefore, although the diaphragm 12 is a single plate-like member, each of the regions 12A and
12B can vibrate independently, and functions as a substantially independent diaphragm.
Therefore, for example, if different audio signals are input to the respective areas 12A and 12B,
multi-channel audio can be output from the diaphragm 12 without substantially interfering.
[0041]
According to the magnetostrictive speaker 10 according to the first embodiment, a plurality of
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single plate members divided into the plurality of regions 12A and 12B are provided, and
between the regions 12A and 12B, the plurality of propagations of vibration can be suppressed.
The diaphragm 12 partitioned by the slits (boundary portion) 18 and capable of vibrating
independently in each of the regions 12A and 12B, and separately disposed in each of the
regions 12A and 12B in the diaphragm 12, the diaphragm 12 Since the plurality of
magnetostrictive vibration devices (oscillators) 14 for driving at multiple points are provided,
mutual interference in the plurality of vibrations can be suppressed, and the degree of separation
of vibrations can be increased.
In addition, since multi-channel audio can be output by the diaphragm 12 which is a single platelike member, a plurality of diaphragms are unnecessary, and cost reduction and miniaturization
can be easily realized.
[0042]
Next, a magnetostrictive speaker 30 according to a second embodiment of the present invention
will be described using FIGS. 3 and 4.
[0043]
As shown in the figure, a magnetostrictive speaker 30 according to a second embodiment of the
present invention includes a diaphragm 32 formed of a single plate-like member and two
magnetostrictive vibration devices (vibrating the diaphragm 32 at multiple points (vibration
Body) 34, 36 and is comprised.
[0044]
The diaphragm 32 is the same as the magnetostrictive speaker 10 according to the first
embodiment in that the diaphragm 32 is constituted by two regions 32A and 32B partitioned by
a plurality of slits 18, but the areas of the regions 32A and 32B are different. The area of the
region 32A is larger than the area of the region 32B.
[0045]
Further, although the respective regions 32A and 32B are separately driven by the two
magnetostrictive vibration devices 34 and 36, they are the same as the magnetostrictive speaker
10 according to the first embodiment, but the axial length of one giant magnetostrictive rod 38A
is the other And the long magnetostrictive rod 38A is controlled to vibrate at a frequency lower
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than that of the short magnetostrictive rod 38B.
The other structure is the same as that of the magnetostrictive speaker 10 according to the first
embodiment, and thus the description thereof will be omitted.
[0046]
According to the magnetostrictive speaker 30 of the second embodiment, since the giant
magnetostrictive rods 38A and 38B are configured such that the axial length increases as the
vibration frequency decreases, the change in sound pressure due to the frequency is reduced.
Can.
That is, generally, in order to obtain the same sound pressure at all frequencies, an amplitude
larger than the amplitude of the high frequency is required at the low frequency, but according
to the magnetostrictive speaker 30 according to the second embodiment, the vibration amount
decreases as the frequency decreases. The low frequency sound pressure can be obtained at the
same level as the high frequency sound pressure.
[0047]
In particular, since the areas 32A and 32B are divided such that the areas become larger as the
frequencies of the corresponding magnetostrictive vibration devices (oscillators) 34 and 36
become lower, the sound pressure can be further equalized. it can.
[0048]
The speaker according to the present invention is not limited to the shape, the structure, and the
like of the magnetostrictive speakers 10 and 30 according to the first and second embodiments.
For example, the sound pressure of the magnetostrictive speakers 10 and 30 can be sufficiently
obtained. In this case, instead of the giant magnetostrictive rod, a magnetostrictive rod made of a
magnetostrictive element may be applied.
[0049]
Further, the “vibrator” in the present invention is not limited to the magnetostrictive vibration
device using the magnetostrictive element, and, for example, a vibration device using a
piezoelectric element can also be applied.
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[0050]
Furthermore, the area of the diaphragm 12 is not limited to two, and the diaphragm may be
divided into three or more areas.
[0051]
In the first and second embodiments, the boundary between the regions 12A and 12B is formed
by the plurality of slits 18. However, the present invention is not limited to this, and, for example,
as shown in FIGS. Like the vibrating plate 40, the boundary between the regions 40A and 40B
may be formed by a groove 42 formed in the vibrating plate 40 with a predetermined width.
[0052]
Furthermore, as in the diaphragm 50 shown in FIGS. 7 and 8, the boundary between the regions
50A and 50B may be configured by ribs 52 provided on the diaphragm 50.
[0053]
Furthermore, as in the diaphragm 60 shown in FIGS. 9 and 10, the boundary between the regions
60A and 60B is configured by holding the diaphragm 60 from both sides in the thickness
direction by the holding member 62. Good.
[0054]
Further, as in the diaphragm 70 shown in FIGS. 11 and 12, the boundary portion between the
regions 70A and 70B is configured by arranging a rubber (elastic member) 72 in contact with the
vibration surface of the diaphragm 70. You may
[0055]
The magnetostrictive speaker according to the present invention is not limited to the structure in
which the diaphragm is fixed by the speaker frame. For example, as in the magnetostrictive
speaker 80 shown in FIG. 13 and FIG. May be supported by the legs 84 of the
[0056]
Also, as in the case of the magnetostrictive speaker 90 shown in FIGS. 15 to 17, even if the
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holding member 94 for holding the diaphragm 92 from both sides in the thickness direction is
provided with an installation stand 94A for supporting the diaphragm 92. Good.
In addition, it is good also as a structure which provided the installation stand in the rib 52
shown by said FIG.7 and FIG.8.
[0057]
A schematic sectional view of the magnetostrictive speaker according to the first embodiment of
the present invention A schematic sectional view of the magnetostrictive speaker in FIG. 1 A
schematic sectional view of the magnetostrictive speaker according to the second embodiment of
the present invention Cross-sectional view Schematic view showing an example in which the
boundary portion of the diaphragm according to the present invention is formed by a groove
Schematic plan side view of the diaphragm in FIG. 5 Cross-sectional side view of the diaphragm
according to the present invention A schematic sectional side view of the diaphragm in the
schematic plan view shown in FIG. 7 A schematic sectional side view of the diaphragm in the
schematic plan view FIG. 9 showing an example in which the boundary portion of the diaphragm
according to the present invention is configured using a holding member Fig. 11 is a schematic
plan view showing an example in which the boundary portion of the diaphragm according to the
present invention is formed using rubber. Fig. 11 is a schematic sectional side view of the
diaphragm in Fig. 11. Fig. 11 is a schematic view showing a magnetostrictive speaker in which
the diaphragm is supported by two legs. 13 is a schematic side view of the magnetostrictive
speaker shown in FIG. A schematic view of a magnetostrictive speaker showing a
magnetostrictive speaker supporting a diaphragm by a mounting base A schematic view of a
magnetostrictive speaker in a schematic view of FIG. 15 A schematic plan view of a
magnetostrictive speaker in FIG. Figure
Explanation of sign
[0058]
DESCRIPTION OF SYMBOLS 1 ... Multi-point drive type plane speaker 2, 16 ... Speaker frame 3 ...
Diaphragm 4 ... Magnetostrictive speaker driver 5 ... Magnetostrictive element 6A-6C ... Series
wound coil 7 ... Connection piece 10, 30, 80, 90 ... Magnetostrictive speaker 12, 32, 40, 50, 60,
70, 82, 92 ... diaphragms 12A, 12B, 32A, 32B, 40A, 40B, 50A, 50B, 60A, 60B, 70A, 70B, 82A,
82B, 92A, 92B ... areas 14 34, 36, 86, 96 Magnetostrictive vibration device 18 Slit 20 Casing 22
Mass member 24, 38A, 38B Super magnetostrictive rod 26 Drive coil 28 Transmission rod 42
Groove 52 Rib 62, 94 Holding Member 72 ... rubber 84 ... leg 94A ... installation stand
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