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JP2012019347

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2012019347
An object of the present invention is to make it possible to obtain a desired sound image
localization and a sense of expansion without depending only on the shape of a diaphragm by a
speaker device having a simple configuration. An acoustic diaphragm 201 having a
predetermined shape and made of a material having physical anisotropy, and attached to the
acoustic diaphragm 201 for exciting a vibration component in consideration of the direction
matched to the physical anisotropy By providing the actuator 208, it is possible to excite the
vibration component in the direction according to the physical anisotropy, and therefore,
compared to the case of using an acoustic diaphragm made of a material having physical
isotropy. It is possible to change the sound surface shape and the frequency characteristics of the
sound pressure level emitted from the acoustic diaphragm 201 to obtain desired sound image
localization and a feeling of spread. [Selected figure] Figure 12
Speaker device
[0001]
The present invention relates to a speaker device, and is suitably applied to a speaker device
capable of obtaining desired sound image localization and a feeling of spread.
[0002]
Heretofore, a speaker system has been proposed in which sound is reproduced by applying
vibration to an acoustic diaphragm by a magnetostrictive actuator (see, for example, Patent
Document 1).
10-05-2019
1
[0003]
As shown in FIG. 1, in the speaker system 1, a cylindrical pipe 2 made of acrylic resin or the like
is vertically supported on a disk-shaped base casing 3, and the four equiangular intervals in the
base casing 3 are obtained. The actuator 4 is arranged at the position of the place.
[0004]
In the speaker system 1, the drive rod 4A of each actuator 4 is brought into contact with the
lower end surface of the pipe 2, the actuator 4 is driven by the audio signal, and vibration in a
direction perpendicular to the lower end surface of the pipe 2 is Add.
[0005]
At this time, the lower end face of the pipe 2 is excited by a longitudinal wave, but the elastic
wave (vibration) propagates in the surface direction (a direction parallel to the surface) of the
pipe 2 to form a mixed wave in which the longitudinal wave and the transverse wave are mixed.
The interaction of Poisson's ratio of the pipe 2 is obtained, which represents the relationship
between the strain in the elastic wave stretching direction and the strain orthogonal to the
stretching direction.
As a result, vibration in the in-plane direction (direction perpendicular to the surface) is excited
with uniform magnitude over the entire surface of the pipe 2 to emit sound waves, and a sense of
uniform spread over the entire height direction of the pipe 2 Sound image is formed.
[0006]
Although omitted in this speaker system 1, Patent Document 1 also shows that a normal speaker
unit 6 is attached to the central opening 5 of the base housing 3.
[0007]
In this case, the pipe 2 functions as a tweeter which is responsible for the high frequency band of
the audio frequency band, and the normal speaker unit 6 is designed to function as a woofer
which is responsible for the low frequency band of the audio frequency band.
[0008]
Japanese Patent Application Laid-Open No. 2007-166027
10-05-2019
2
[0009]
By the way, in the speaker system 1 described in Patent Document 1 described above, since the
pipe 2 of the acoustic diaphragm made of a material having physical isotropy having the same
physical constant in any direction is used, the pipe The propagation velocity and propagation
attenuation of the elastic wave propagating in the two plane directions were the same in any
direction.
[0010]
Here, the wave front shape of the sound wave radiated from the pipe 2 which is an acoustic
diaphragm depends on the diaphragm shape of the pipe 2, and when forming an arbitrary sound
wave surface, the diaphragm shape of the pipe 2 is There is a restriction that it must be designed
in consideration.
[0011]
The present invention has been made in consideration of the above points, and an object of the
present invention is to propose a speaker device having a simple configuration in which desired
sound image localization and a sense of expansion can be obtained without depending only on
the diaphragm shape.
[0012]
In order to solve such problems, in the present invention, an acoustic vibration plate of a
predetermined shape made of a material having physical anisotropy, and a sound to excite the
vibration component in consideration of the direction matched to the physical anisotropy. Since
the vibration component can be excited in the direction matched to the physical anisotropy by
providing the vibration means attached to the vibration plate, an acoustic vibration plate made of
a material having physical isotropy can be obtained. As compared with the case of using, it is
possible to change the frequency characteristics of the sound surface shape and the sound
pressure level emitted from the acoustic diaphragm.
[0013]
According to the present invention, since the vibration component can be oscillated in the
direction in accordance with the physical anisotropy, compared with the case of using an
acoustic diaphragm made of a material having physical isotropy, the acoustics To realize a
speaker device capable of changing the frequency characteristics of sound surface shape and
sound pressure level radiated from a diaphragm, and thus obtaining desired sound image
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3
localization and spread feeling independent of only the diaphragm shape. Can.
[0014]
It is an approximate line perspective view showing the whole composition of the conventional
speaker device.
It is a basic diagram which shows the structure (1) of the speaker apparatus in which the
acoustic diaphragm which has physical anisotropy was used.
It is a basic diagram which shows the structure (2) of the speaker apparatus in which the
acoustic diaphragm which has physical anisotropy was used.
It is a basic diagram which shows the structure (3) of the speaker apparatus in which the
acoustic diaphragm which has physical anisotropy was used.
It is a basic diagram by which it uses for description of the method (1) which gives physical
anisotropy.
It is a basic diagram by which it uses for explanation of the method (2) which gives physical
anisotropy.
It is a basic diagram which shows the drive direction and frequency characteristic to wood.
It is an approximate line perspective view showing the appearance composition of the speaker
apparatus in a 1st embodiment.
It is a basic diagram which shows the upper surface of the speaker apparatus in 1st Embodiment,
and side structure.
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4
It is an approximate line perspective view showing the undersurface composition of the speaker
apparatus in a 1st embodiment.
FIG. 2 is a schematic cross-sectional view showing a cross-sectional configuration of the speaker
device in the first embodiment.
It is a basic diagram which shows the grid direction in 1st Embodiment, and the excitation
direction of an actuator. It is a basic diagram which shows the frequency characteristic of a
sound pressure level when acrylic is used as an acoustic diaphragm. It is a basic diagram which
shows the frequency characteristic of a sound pressure level when wood is used as an acoustic
diaphragm. It is a rough-line block diagram which shows the structure of the drive system of the
speaker apparatus in 1st Embodiment. It is an approximate line perspective view showing the
appearance composition of the speaker apparatus in a 2nd embodiment. It is a basic diagram
which shows the upper surface and side structure of the speaker apparatus in 2nd Embodiment.
It is an approximate line perspective view showing the undersurface composition of the speaker
apparatus in a 2nd embodiment. It is a schematic line sectional view showing the section
composition of the speaker apparatus in a 2nd embodiment. It is a schematic diagram which
shows the grid direction and the excitation direction of an actuator in 2nd Embodiment. It is a
schematic line sectional view showing the attachment state (1) of the actuator in other
embodiments. It is a schematic line sectional view showing the attachment state (2) of the
actuator in other embodiments. It is a schematic line sectional view showing the attachment state
(3) of the actuator in other embodiments. It is a schematic line sectional view showing the
attachment state (4) of the actuator in other embodiments.
[0015]
Hereinafter, modes for carrying out the invention will be described. The description will be made
in the following order. 1. Principle 2. First embodiment 3. Second embodiment 4. Other
embodiments
[0016]
<1. Principle> In the present invention, the principle of using an acoustic diaphragm having
physical anisotropy as a material will be described.
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5
[0017]
For example, as shown in FIG. 2, the speaker device 100 is configured by a base housing 101, a
plate-like acoustic diaphragm 102 having physical anisotropy, and an actuator 103 for exciting
the acoustic diaphragm 102. It is done.
[0018]
In the speaker device 100, the actuator 103 is housed and fixed in the housing hole 114 of the
base housing 101, and the drive rod 103A of the actuator 103 is on the lower end side of the
acoustic diaphragm 102 having physical anisotropy. It will be in the state contact | abutted by
the end surface.
[0019]
Incidentally, in the actuator 103, the drive rod 103A may not be provided, and the acoustic
diaphragm 102 having physical anisotropy may be vibrated directly from the actuator 103.
[0020]
At this time, the displacement direction of the drive rod 103A of the actuator 103 is the direction
orthogonal to this end face, that is, the Y-axis direction of the acoustic diaphragm 102 having
physical anisotropy.
[0021]
In the speaker device 100, when arranged in such a manner, the actuator 103 is excited by the
actuator 103 with a vibration component in a direction orthogonal to the end surface from the
end surface on the lower end portion side of the acoustic diaphragm 102 having physical
anisotropy. Can excite an elastic wave propagating in the direction of the vibration component.
[0022]
Here, the physical material constant in the Y-axis direction in the acoustic diaphragm 102 having
physical anisotropy, for example, the propagation loss of elastic modulus or elastic wave is the Xaxis direction in the acoustic diaphragm 102 having physical anisotropy. It is different from
[0023]
Therefore, in the speaker device 100, by using the acoustic diaphragm 102 having such physical
anisotropy, it is possible to obtain a sound image localization and a feeling of spread unique to
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6
the acoustic diaphragm 102.
[0024]
FIG. 2 is an explanatory view of the case where an elastic wave propagates in the Y-axis direction
of the acoustic diaphragm 102 having physical anisotropy, in contrast to X of the acoustic
diaphragm 102 (FIG. 2). Next, a speaker apparatus using an acoustic diaphragm having a
physical anisotropy in which the axial direction and the Y-axis direction are slightly rotated
counterclockwise will be described.
[0025]
As shown in FIG. 3 in which the same reference numerals as in FIG. 2 denote the same parts, the
speaker device 110 includes a base housing 101, a plate-like acoustic diaphragm 112 having
physical anisotropy, and the acoustic diaphragm. An actuator 103 for vibrating 112 is
configured.
[0026]
In the speaker device 110, the actuator 103 is accommodated and fixed in the accommodation
hole 114 of the base housing 101, and the drive rod 103A of the actuator 103 is on the lower
end side of the acoustic diaphragm 112 having physical anisotropy. It will be in the state contact
| abutted by the end surface.
[0027]
At this time, the displacement direction of the drive rod 103A of the actuator 103 is a direction
orthogonal to this end face, that is, a substantially middle direction between the Y axis direction
and the X axis direction of the acoustic diaphragm 102 having physical anisotropy.
[0028]
In the speaker device 110, when arranged in this way, from the end face on the lower end
portion side of the acoustic diaphragm 112 having physical anisotropy, the actuator 103 excites
with an oscillating component in the direction orthogonal to this end face. Can excite an elastic
wave propagating in the direction of the vibration component.
[0029]
In this case, in the acoustic diaphragm 112 in the speaker device 110 (FIG. 3), the physical
anisotropy is different compared to the acoustic diaphragm 102 in the speaker device 100 (FIG.
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7
2). Compared to the plate 102, the propagation velocity and the propagation loss of the elastic
wave propagating in the surface direction of the acoustic diaphragm 112 are changed.
[0030]
Therefore, in the speaker device 110, by using the acoustic diaphragm 112 having such physical
anisotropy, it is possible to obtain a sound image localization and a feeling of spread unique to
the acoustic diaphragm 112.
[0031]
Furthermore, as shown in FIG. 4 in which the same reference numerals as in FIG. 3 denote the
same parts, the speaker device 120 includes a base housing 101, a plate-like acoustic diaphragm
122 having physical anisotropy, and the acoustic vibration. It is comprised by the actuator 103
which vibrates the board 122. FIG.
[0032]
In the speaker device 120, the actuator 103 is housed and fixed in the housing hole 114 of the
base housing 101, and the drive rod 103A of the actuator 103 is on the lower end side of the
acoustic diaphragm 122 having physical anisotropy. It will be in the state contact | abutted by
the end surface.
[0033]
At this time, the displacement direction of the drive rod 103A of the actuator 103 is the direction
orthogonal to this end face, that is, the X axis direction of the acoustic diaphragm 122 having
physical anisotropy, and 90 as compared with the acoustic diaphragm 102 of the speaker device
100. It is in the rotated state.
[0034]
In the speaker device 120, when arranged in this way, from the end face on the lower end
portion side of the acoustic diaphragm 122 having physical anisotropy, the actuator 103 excites
with an oscillating component in the direction orthogonal to this end face. Can excite an elastic
wave propagating in the direction of the vibration component.
[0035]
Also in this case, in the acoustic diaphragm 122 in the speaker device 120 (FIG. 4), the physical
anisotropy is different by 90 degrees from the acoustic diaphragm 102 in the speaker device
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8
100 (FIG. 2). Compared with the acoustic diaphragm 102, the propagation speed and the
propagation loss of the elastic wave propagating in the surface direction of the acoustic
diaphragm 122 are changed.
[0036]
Therefore, in the speaker device 120, by using the acoustic diaphragm 122 having such physical
anisotropy, it is possible to obtain a sound image localization and a sense of spread by the
acoustic diaphragm 122.
[0037]
The elastic modulus Ex in the X-axis direction, the elastic modulus Ey in the Y-axis direction, the
propagation loss coefficient Lx in the X-axis direction, and the propagation loss coefficient in the
Y-axis direction in the acoustic diaphragms 102, 112, 122 having physical anisotropy Assuming
that Ly is the volume density 音響 of the acoustic diaphragm 102, the propagation velocity Vx of
the elastic wave (in the case of a longitudinal wave) propagating in the X-axis direction = (Ex / ρ)
<1/2>, the elasticity propagating in the Y-axis direction The propagation velocity V y of the wave
(in the case of the longitudinal wave) can be expressed as Vy = (Ey / ρ) <1/2>.
[0038]
Because the physical anisotropy is different by 90 degrees between the acoustic diaphragm 102
and the acoustic diaphragm 122, the propagation velocity is greatly changed between the
propagation velocity Vy in the acoustic diaphragm 102 and the propagation velocity Vx in the
acoustic diaphragm 122 It will be done.
[0039]
The acoustic diaphragm 112 (FIG. 3) corresponds to the Y-axis direction of the acoustic
diaphragm 102 (FIG. 2) and the X-axis direction of the acoustic diaphragm 122 (FIG. 4) in the Yaxis direction and the X direction. The propagation velocity is intermediate between the
propagation velocity Vy and the propagation velocity Vx.
[0040]
As described above, since the propagation loss of the elastic wave depends on the propagation
direction, it is obvious that the propagation loss of the elastic wave changes depending on the
propagation direction.
10-05-2019
9
[0041]
In the speaker devices 100, 110 and 120, elastic waves propagate in the surface direction of the
acoustic diaphragms 102, 112 and 122 having physical anisotropy, and Poisson's ratios of the
acoustic diaphragms 102, 112 and 122. Sound waves are emitted into the atmosphere while
exciting natural vibration modes in the in-plane direction (direction orthogonal to the plane) of
the acoustic diaphragms 102, 112 and 122.
[0042]
Therefore, in the speaker devices 100, 110, and 120, when the propagation speed or
propagation loss of the elastic wave changes according to the acoustic diaphragms 102, 112, and
122 having physical anisotropy, the sound wave surface radiated to the atmosphere changes. It
will be done.
[0043]
That is, in the speaker devices 100, 110 and 120, by using the acoustic diaphragms 102, 112
and 122 having different physical anisotropy, the diaphragms of the acoustic diaphragms 102,
112 and 122 have a plate shape. Despite being the same, it is arranged to be able to emit sound
waves of different sound surface shapes from the acoustic diaphragms 102, 112 and 122,
respectively.
[0044]
By the way, in order to give the diaphragm material a physical anisotropy, as shown in FIG. 5,
there is a method of applying different forces in the X-axis direction and the Y-axis direction
when producing the acoustic diaphragm material MT1 in sheet form. .
[0045]
Further, as shown in FIG. 6, there is a method of alternately laminating two types of acoustic
diaphragm materials MT2A and MT2B different in physical anisotropy.
In this case, the method of lamination is not limited to this, and three acoustic diaphragm
materials MT2A may be laminated, and two acoustic diaphragm materials MT2B may be
laminated above or below it, or the same. The five acoustic diaphragm materials MT2A or MT2B
may be stacked.
10-05-2019
10
[0046]
Furthermore, although a method of producing a diaphragm in consideration of the eye direction
of the annual ring of wood can be considered, various other methods can be used as long as
physical anisotropy can be expressed otherwise.
[0047]
As shown in FIGS. 7A and 7B, wood is used as the acoustic diaphragm, and the propagation
direction of the elastic wave propagating in the surface direction by the actuator 208 is
orthogonal to the grid (FIG. 7A) and In the case of the grid direction (FIG. 7 (B)), it can be
confirmed that the frequency characteristics of the sound pressure level differ depending on the
propagation direction of the elastic wave to the acoustic diaphragm.
[0048]
In this case, while the propagation speed of the elastic wave is slower in the direction orthogonal
to the grid (FIG. 7A) and the propagation loss is larger, the propagation of the elastic wave is in
the grid direction (FIG. 7B) The speed is fast and the propagation loss is small.
The propagation speed is determined by the volume density of the material of the acoustic
diaphragm and the hardness (Young's modulus) in the propagation direction.
[0049]
As for the propagation loss, in the case of the direction orthogonal to the grid (Fig. 7 (A)), the
material (acoustic impedance) is different before and after the boundary of the wood grain, so the
elastic wave is reflected, the loss increases and the propagation rate It will decrease.
On the other hand, in the case of the grid direction (FIG. 7 (B)), the elastic wave propagates at
substantially the same speed to the acoustic diaphragm.
[0050]
That is, even in the case of the same acoustic diaphragm, in the case where the propagation
10-05-2019
11
direction of the vibration component by the actuator 208 is aligned along the grid direction and
in the case where the propagation direction of the vibration component by the actuator 208 is
aligned along the direction orthogonal to the grid, It can be seen that the propagation speed, the
propagation loss change, and the frequency characteristics of the sound pressure level are
different.
[0051]
This is the principle of using the acoustic diaphragms 102, 112 or 122 originally formed using
wood having physical anisotropy.
[0052]
In this case, the plate-like acoustic diaphragms 102, 112 and 122 have been described as an
example, but the acoustic diaphragms 102, 112 and 122 may have a tubular, spherical or other
various shapes.
[0053]
Further, in the speaker devices 100, 110 and 120, the actuator 103 is installed in contact with
the end surfaces of the acoustic diaphragms 102, 112 and 122 on the lower end side.
However, the present invention is not limited to this, and through holes may be provided in the
acoustic diaphragms 102, 112 and 122, and the actuator 103 may be installed in contact with
the cross section of that portion.
Further, grooves may be provided in the acoustic diaphragms 102, 112 and 122, and the
actuator 103 may be disposed so as to excite the cross section of the grooves.
[0054]
<2.
First Embodiment Next, the speaker device 200 according to a first embodiment using the above-
10-05-2019
12
described principle will be specifically described.
[2−1.
External Configuration of Speaker Device] As shown in FIG. 8, the speaker device 200 has an
acoustic diaphragm 201 that is generally frusto-conical in shape and in which an internal space
is formed, with respect to the center of the acoustic diaphragm 201. A through hole 202 is
formed downward from above.
[0055]
In the speaker device 200, the acoustic diaphragm 201 is made of wood, and the grain direction
of the wood grain is formed to be substantially vertical in the figure.
[0056]
The acoustic diaphragm 201 of the speaker device 200 is manufactured by shaving out of one
piece of wood, but a plurality of block materials are laminated in a state where the wood grain is
aligned, and scraped out therefrom It is also possible to manufacture by
[0057]
As shown in FIGS. 9A and 9B, the speaker device 200 is provided with a pipe-like leg 203 having
a predetermined diameter coaxially with the through hole 202, and the leg 203 and the
truncated cone are provided. It has a structure in which the shape and the acoustic diaphragm
201 are integrally formed.
[0058]
The leg portion 203 protrudes downward by about 23 mm from the lower end surface of the
acoustic diaphragm 201. For example, when installed on the floor, the lower end surface of the
acoustic diaphragm 201 does not contact the installation surface of the floor. It is done.
The speaker device 200 has a height of about 170 mm from the installation surface of the floor
to the upper surface of the acoustic diaphragm 201.
10-05-2019
13
[0059]
Further, as shown in FIG. 10, the speaker device 200 has a structure in which the lower end
portion of the acoustic diaphragm 201 is closed by a donut-shaped plate 201A made of resin or
the like, and the leg portion 203 protruding from the plate 201A is As a center, a total of three
middle to low-range speaker units 204, which are arranged in a ring shape at intervals of 120
degrees, are attached around the center.
[0060]
At this time, as described above, when the speaker device 200 is installed on the floor through
the legs 203, the lower end surface of the acoustic diaphragm 201 does not contact the
installation surface of the floor, and thus three speaker units are provided. The sound wave
emitted from 204 is not blocked by the floor installation surface, and can be output to the
outside as a mid-low range sound.
[0061]
In addition, in the speaker device 200, a total of 12 LED elements 207 arranged in a ring shape
with a 30 degree interval are attached to the outer peripheral side of the plate 201A attached to
the lower end of the acoustic diaphragm 201.
[0062]
Also at this time, as described above, when the speaker device 200 is installed on the floor
through the legs 203, the lower end surface of the acoustic diaphragm 201 does not contact the
installation surface of the floor. The irradiation light from the element 207 is not blocked by the
installation surface of the floor, and irradiates the installation surface and can also irradiate the
outer area around the installation surface.
[0063]
[2−2.
Cross-Sectional Configuration of Speaker Device] As shown in FIG. 11, in the speaker device 200,
the speaker unit 204 provided in the internal space of the acoustic diaphragm 201 having a
truncated cone shape is attached to the back surface side of the plate 201A. The diaphragm
portion of the speaker unit 204 is exposed from the surface side of the plate 201A.
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14
[0064]
In this case, the lower end of the acoustic diaphragm 201 of the speaker device 200 is closed by
the plate 201A, so the acoustic diaphragm 201 and the plate 201A function as an enclosure for
the speaker unit 204 attached to the plate 201A. It is made to do.
[0065]
The speaker device 200 is provided in a total of two places so that the ducts 209 of a
predetermined diameter are connected to the through holes 202 with respect to the wall
measuring wall integrated with the leg portion 203 of the acoustic diaphragm 201 and facing
each other. Thus, the duct 209 and the through hole 202 form a bass reflex port.
In the case where a sufficient volume is provided in the acoustic diaphragm 201, the duct 209
need not necessarily be provided, and may be a closed type structure.
[0066]
In the speaker device 200, an actuator 208 for exciting the side wall in the direction of arrow H
with respect to the lower side wall of the outer peripheral side of the acoustic diaphragm 201 is
in a state of being concealed inside the acoustic diaphragm 201. A total of 4 pieces are attached
in a ring of 90 degree intervals.
[0067]
In this case, the displacement direction by the actuator 208 is also the direction (surface
direction) from the lower side to the upper side of the acoustic diaphragm 201, and the acoustic
diaphragm 201 can be excited by the four actuators 208.
[0068]
Here, as the actuator 208, for example, a piezoelectric actuator, a magnetostrictive actuator, or
an electrodynamic actuator is used.
[0069]
At this time, in the speaker device 200, the side wall lower side on the outer peripheral side of
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15
the acoustic diaphragm 201 is excited by the longitudinal wave, and the vibration elastic wave
propagates in the direction from the lower side of the acoustic diaphragm 201 to the upper
direction (grid direction). A mixed wave in which longitudinal waves and transverse waves are
mixed is emitted to the acoustic diaphragm 201, and a uniform sound image is formed over the
entire height direction of the acoustic diaphragm 201.
[0070]
Thus, in the speaker device 200, the acoustic diaphragm 201 constitutes a speaker serving as the
high frequency side of the audio frequency band to function as a tweeter, while the speaker unit
204 constitutes a speaker serving as the middle and low frequency side of the audio frequency
band as a woofer It is made to work.
[0071]
By the way, in the speaker device 200, as shown in FIG. 12, four actuators 208 are attached in a
ring shape with a 90 degree interval so as to align the excitation direction with the grid direction
of the acoustic diaphragm 201.
[0072]
Here, the four actuators 208 are driven by four independent audio signals, respectively, and
excite the acoustic diaphragm 201 with a vibration component in the direction of arrow H with
respect to the side wall on the outer peripheral side of the acoustic diaphragm 201. At this time,
each vibration component corresponding to the four types of audio signals propagates efficiently
along the grid direction, and it becomes difficult to propagate in the direction orthogonal to the
grid.
[0073]
That is, in the speaker device 200, the four actuators 208 are attached so that the excitation
direction is aligned with the grid direction of the acoustic diaphragm 201, so that the respective
vibration components by the four actuators 208 are mixed. To avoid the crosstalk and to reduce
the crosstalk significantly.
[0074]
Incidentally, the speaker device 200 (FIG. 11) is connected to the cord 210 for supplying four
types of audio signals from the outside and supplying them to the four actuators 208 and the
three speaker units 204, for example, the legs It is also assumed to be used in a state of being
attached to a wall or the like via 203.
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16
[0075]
In the speaker device 200, although not shown, a power supply battery and an amplifier are
housed inside the acoustic diaphragm 201, and the speaker device 200 is made to function as an
active speaker.
However, the power supply battery, the amplifier, and the like need not necessarily be
accommodated, and the power supply battery, the amplifier, and the like may function only as
passive speakers that are not built in.
[0076]
[2−3.
Frequency characteristics of sound pressure level due to difference in material] Next, for
example, frequency characteristics of sound pressure level when a pipe-like acoustic diaphragm
using a resin such as acrylic having isotropy as a material is excited, How is the difference in
physical anisotropy depending on the material about the frequency characteristics of the sound
pressure level when a pipe-like acoustic diaphragm is excited using wood with physical
anisotropy as the material? To verify.
[0077]
Incidentally, here, a concrete explanation will be given through experimental results
demonstrated using a pipe-shaped acoustic diaphragm instead of a truncated conical acoustic
diaphragm.
[0078]
In FIGS. 13A and 13B, the lower end end face of the pipe-like acoustic diaphragm 341 made of a
resin such as acrylic resin as the material in the speaker device 340 at two points on the front
side and the back side. The sound pressure level in the case where the two actuators 342 and
343 vibrate in the vertical direction.
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17
[0079]
On the other hand, in FIGS. 14A and 14B, in the speaker device 350, with respect to two points
on the front side and the back side of the pipe-shaped acoustic diaphragm 351 in which wood is
used as a material, from the lower end end face The sound pressure level when excited by the
two actuators 352 and 353 in the vertical direction is shown.
[0080]
Comparing the both, the speaker device 350 (FIG. 14) having the acoustic diaphragm 351 made
of wood as a material has the speaker device 340 (FIG. 14) having the acoustic diaphragm 341
made of a resin such as acrylic. 13) It can be seen that the peak dip (solid line) on the front side
is smaller than that in 13).
[0081]
Further, the speaker apparatus 350 (FIG. 14) having the acoustic diaphragm 351 using wood is
more accurate than the speaker apparatus 340 (FIG. 13) having the acoustic diaphragm 341
using resin such as acrylic. It can be seen that the encircling of the vibration component from the
side to the back side is small (the larger the difference between the sound pressure level on the
front side and the back side, the smaller the encircling of the vibration component is considered).
This is because, due to the grain of the wood grain in the acoustic diaphragm 351, vibration
propagation attenuation in the circumferential direction is increased.
[0082]
As can be understood from this result, the acoustic vibration using wood having physical
anisotropy like a square rather than the acoustic diaphragm 341 (FIG. 13) using a resin such as
acrylic having an isotropy When the plate 351 (FIG. 14) is used, the vibration propagation
attenuation in the circumferential direction becomes larger due to the grid and the entrapment of
the vibration component from the eye side to the back side becomes smaller, so that crosstalk
can be reduced significantly. Can understand.
[0083]
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18
[2−4.
Configuration of Drive System of Speaker Device] Next, a drive system of the speaker device 200
will be described.
As shown in FIG. 15, the speaker device 200 is roughly divided into a DSP block 301 and
amplifier blocks 302 and 303.
[0084]
The DSP block 301 includes a signal correction and sound field control unit 301A on the
actuator 208 (208A to 208D) side and a signal correction and sound field control unit 301B on
the speaker unit 204 (204A to 204C) side.
[0085]
The signal correction and sound field control unit 301A on the side of the actuator 208
corresponds to the four actuators 208 (208A to 208D), respectively, and includes four signal
processing units 311 (311A to 311D) and four high pass filters 312 ( 312A-312D).
[0086]
Furthermore, the signal correction and sound field control unit 301A attenuates the left audio
signal AL and the right audio signal AR, which constitute stereo audio signals, to four signal
processing units 311 (311A to 311D), respectively. Attenuator (310A1, 310A2, 310B1, 310B2,...,
310D1, 310D2).
[0087]
The individual signal processing units 311 (311A to 311D) adjust the signal levels, delay time,
frequency characteristics, etc. of the left audio signal AL and the right audio signal AR
respectively input, and further, the left audio signal AL and the right audio signal While
performing mixing processing (sound field control processing) on the signal AR, signal correction
processing on output characteristics of the actuators 208 (208A to 208D) is performed.
[0088]
The individual high-pass filters 312 (312A to 312D) extract high-frequency components of the
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audio signals supplied from the signal processing units 311 (311A to 311D), and send them to
the respective amplifiers 302A to 302D of the amplifier block 302. Do.
[0089]
In this case, the four actuators 208 (208A to 208D) are sound signals obtained as a result of
performing sound field control processing and signal correction processing independently of
each other by the signal correction and sound field control unit 301A of the DSP block 301. The
high frequency component is supplied after being amplified by the amplifier block 302.
[0090]
As described above, the speaker device 200 enhances the sense of sound spreading by the high
frequency sound output by driving the four actuators 208 (208A to 208D) with the high
frequency components subjected to the respective sound field control processes. be able to.
[0091]
On the other hand, the signal correction and sound field control unit 301B on the speaker unit
204 side includes signal processing units 321A to 321C and low pass filters 322A to 322C
corresponding to the speaker units 204A to 204C.
[0092]
Furthermore, the signal correction and sound field control unit 301B attenuates the left audio
signal AL and the right audio signal AR that constitute the stereo audio signal to the signal
processing units 321A to 321C, and attenuators 320A1, A2, and 320B1 are input. , B2 and
320C1, C2.
[0093]
The signal processing units 321A to 321C adjust the signal levels, delay time, frequency
characteristics, etc. of the left audio signal AL and the right audio signal AR, and further, mix
processing for the left audio signal AL and the right audio signal AR (sound field control In
addition to processing (1), signal correction processing relating to resonance tube characteristics
is performed.
The low pass filters 322A to 322C extract low frequency components of the audio signals
10-05-2019
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supplied from the signal processing units 321A to 321C, and send the low frequency
components to the amplifiers 303A to 303C.
[0094]
In this case, the low-frequency component of the audio signal obtained by performing the signal
correction of the DSP block 301 and the sound field control processing and signal correction
processing of the sound field control unit 301B in the speaker units 204A to 204C is the
amplifier 303A to 303C. It is supplied after being amplified by
[0095]
As described above, the speaker device 200 can enhance the sense of sound spreading due to the
low frequency sound output by driving the speaker units 204A to 204C with the low frequency
component subjected to the sound field control processing.
[0096]
The order of the signal processing unit 311 (311A to 311D) of the signal correction and sound
field control unit 301A and the high pass filter 312 (312A to 312D) may be reversed, and
similarly, the signal correction and sound field control unit 301B The order of the processing
units 321 (321A to 321C) and the low pass filters 322 (322A to 322C) may be reversed.
[0097]
[2−5.
Operation of Speaker Device] Next, the operation of the speaker device 200 (FIGS. 8 to 12) will
be described.
[0098]
In the speaker device 200, four actuators 208 (208A to 208D) provided inside the acoustic
diaphragm 201 are driven by the left audio signal AL and the right audio signal AR, and from the
lower side to the upper side of the acoustic diaphragm 201 The acoustic diaphragm 201 is
excited by the vibration component in the direction of arrow H (FIG. 11).
10-05-2019
21
[0099]
At this time, the acoustic diaphragm 201 is excited by the longitudinal wave, and the elastic wave
(vibration) propagates in the direction (surface direction) from the lower side to the upper side of
the acoustic diaphragm 201.
Then, when the elastic wave propagates through the acoustic diaphragm 201, mode conversion
of longitudinal waves, transverse waves, longitudinal waves, ... is repeated to become a mixed
wave of longitudinal waves and transverse waves, and the plane of the acoustic diaphragm 201 is
generated by the transverse waves. Vibration in the inward direction (direction perpendicular to
the surface) is excited.
[0100]
Thus, the speaker device 200 emits a sound wave from the surface of the acoustic diaphragm
201.
That is, the speaker device 200 can obtain an audio output of a high range from the outer
surface of the acoustic diaphragm 201.
[0101]
Further, in the speaker device 200, since the lower end face of the acoustic vibration diaphragm
201 does not contact the installation surface of the floor due to the legs 203, the middle to lowrange sound output from the three speaker units 204 attached to the plate 201A. Because the
duct 209 and the through hole 202 form a bass reflex port, the bass range can be increased.
[0102]
[2−6.
Lighting Effect in Speaker Device] In this speaker device 200 (FIG. 12), the lower part of the
acoustic diaphragm 201 is irradiated with the irradiation light from a total of 12 LED elements
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207 attached to the plate 201A, thereby the acoustic diaphragm It is possible to obtain a lighting
effect that causes light to leak around the light source 201 and brighten it.
[0103]
As a result, since the speaker device 200 has a configuration in which the appearance does not
look like a speaker, it is an audio output means, but an interior lighting means such as a lamp on
a bedside of a room or indirect lighting of a room. It can also be used as
[0104]
[2−7.
Operation and Effects] In the above configuration, the speaker device 200 utilizes the anisotropy
of the acoustic diaphragm 201 having a frusto-conical shape, with respect to the grid direction of
the acoustic diaphragm 201 formed so that the grain is perpendicular. The four actuators 208
are attached so as to match the direction of excitation.
[0105]
Thus, the speaker device 200 not only changes the shape of the acoustic diaphragm 201 but also
the anisotropy of the acoustic diaphragm 201 as a parameter for changing the sound wave
surface shape and the frequency characteristics of the sound pressure level radiated from the
acoustic diaphragm 201. It is possible to add the propagation direction of the sound wave by the
above, and to expand the control area of the sound image localization and the sense of spread.
[0106]
In addition, the speaker device 200 drives the four actuators 208 by four types of independent
audio signals, and adds the acoustic diaphragm 201 to the side wall on the outer peripheral side
of the acoustic diaphragm 201 by the vibration component in the arrow H direction. I tried to
shake it.
[0107]
As a result, in the speaker device 200, each vibration component corresponding to the four types
of audio signals is efficiently propagated along the grid direction of the acoustic diaphragm 201,
and is uniform over the entire height direction of the acoustic diaphragm 201. Sound image can
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be formed.
[0108]
Furthermore, in the speaker device 200, four actuators 208 are attached so that the excitation
direction is aligned with the grid direction of the acoustic diaphragm 201. The propagation loss
in the orthogonal direction is large, and the mixing of the vibration components can be avoided.
Thus, crosstalk can be prevented and good acoustic characteristics can be obtained.
[0109]
The speaker device 200 can make the light leak and brighten also around the acoustic
diaphragm 201 by the irradiation light from a total of 12 LED elements 207 attached to the plate
201A.
[0110]
Thus, the speaker device 200 can function as an audio output unit capable of obtaining the
above-described good acoustic characteristics with the crosstalk prevented, and can also function
as an interior lighting unit.
[0111]
According to the above configuration, the speaker device 200 makes use of the anisotropy of the
acoustic diaphragm 201 having a frusto-conical shape formed such that the grain is vertical, and
the speaker device 200 is added to the grid direction of the acoustic diaphragm 201. By
attaching the four actuators 208 so as to match the vibration direction, crosstalk due to mixing of
the respective vibration components by the four actuators 208 can be prevented in advance to
obtain good acoustic characteristics. it can.
[0112]
<3.
Second Embodiment> Next, as shown in FIGS. 16 and 17, a speaker device 400 according to a
second embodiment using the above-described principle will be specifically described.
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[0113]
Here, the major difference from the speaker device 200 in the first embodiment is mainly that
the grid direction of the acoustic diaphragm 401 is not vertical but circumferential, and the
mounting position of an actuator (described later) Are different.
[0114]
[3−1.
External Configuration of Speaker Device] As shown in FIG. 16, the speaker device 400 has an
acoustic diaphragm 401 which is generally frusto-conical in shape and in which an internal space
is formed, with respect to the center of the acoustic diaphragm 401. Through holes 402 are
formed downward from above.
[0115]
Also in the speaker device 400, the acoustic diaphragm 401 is made of wood, and the grain
direction of the wood grain is formed in the circumferential direction in the figure.
[0116]
The acoustic diaphragm 401 of the speaker device 400 is manufactured by shaving out of one
piece of wood, but a plurality of block materials are laminated in the aligned state of the wood
grain and scraped out therefrom It is also possible to manufacture by
[0117]
As shown in FIGS. 17A and 17B, the speaker device 400 is provided with a pipe-like leg 403
having a predetermined diameter coaxially with the through hole 402, and the leg 403 and the
truncated cone are provided. It has a structure in which an acoustic diaphragm 401 of a shape is
integrally formed.
[0118]
The leg portion 403 protrudes downward by about 23 mm from the lower end surface of the
acoustic diaphragm 401. For example, when installed on the floor, the lower end surface of the
10-05-2019
25
acoustic diaphragm 401 does not contact the installation surface of the floor It is done.
The speaker device 400 has a height of about 170 mm from the floor installation surface to the
top surface of the acoustic diaphragm 401.
[0119]
As in the case of the speaker device 200 (FIG. 10), the lower end portion of the acoustic
diaphragm 401 is made of resin or the like as shown in FIG. 18 in which the same reference
numerals as in FIG. As a result of being closed by the donut-shaped plate 201A, an inner space is
provided.
[0120]
In the speaker apparatus 400, a total of three speaker units 204 for middle-to-low range sound,
which are arranged in a ring shape with a 120-degree interval, are attached around the leg 403
projecting from the plate 201A.
[0121]
In addition, in the speaker device 400, a total of 12 LED elements 207 arranged in an annular
shape at intervals of 30 degrees are attached to the outer peripheral side of the plate 201A
attached to the lower end of the acoustic diaphragm 401.
[0122]
[3−2.
Cross-Sectional Configuration of Speaker Device] As shown in FIG. 19 in which the same
reference numerals as in FIG. 11 denote the same parts, the speaker device 400 has a speaker
unit 204 provided in the internal space of the acoustic diaphragm 401 having a truncated cone
shape. It is attached to the back side of the plate 201A, and the diaphragm portion of the speaker
unit 204 is exposed from the front side of the plate 201A.
[0123]
In this case, the lower end of the acoustic diaphragm 401 of the speaker device 400 is closed by
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the plate 201A, so the acoustic diaphragm 201 and the plate 201A function as an enclosure for
the speaker unit 204 attached to the plate 201A. It is made to do.
[0124]
The speaker device 400 is provided in a total of two places so that the duct 409 of a
predetermined diameter is connected to the through hole 402 and facing each other with respect
to the wall-wall integrated with the leg portion 403 of the acoustic diaphragm 401 Thus, the duct
409 and the through hole 402 form a bass reflex port.
[0125]
Further, the speaker device 400 is in a state of being concealed inside the acoustic diaphragm
401, and the side wall is made circumferential relative to the height position of the four steps in
the circumferential direction with respect to the side wall on the outer peripheral side of the
acoustic diaphragm 401. A total of four actuators 208 for vibrating are attached.
[0126]
Here, as the actuator 208, for example, a piezoelectric actuator, a magnetostrictive actuator, or
an electrodynamic actuator is used.
[0127]
At this time, in the speaker device 400, the circumferential direction portions corresponding to
the height positions of the four steps in the outer sidewall of the acoustic diaphragm 401 are
respectively excited by the longitudinal waves, and the vibration elastic wave is excited in the
circumferential direction of the acoustic diaphragm 401 By propagating in the direction), it is
emitted to the acoustic diaphragm 401 in the form of a mixed wave in which longitudinal waves
and transverse waves are mixed, and the whole of the circumferential direction corresponding to
the height position of the four stages of the acoustic diaphragm 401 It is designed to form a
uniform sound image across it.
[0128]
Thus, in the speaker device 400, the acoustic diaphragm 401 constitutes a speaker serving as the
high frequency side of the audio frequency band to function as a tweeter, while the speaker unit
204 constitutes a speaker serving as the middle and low frequency side of the audio frequency
band as a woofer It is made to work.
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[0129]
By the way, in the speaker device 400, as shown in FIG. 20, the four actuators 208 with respect
to the height position of the four steps in the circumferential direction on the side wall so that
the excitation direction is aligned with the grid direction of the acoustic diaphragm 401. It is
attached.
[0130]
Here, the four actuators 208 attached respectively to the four height positions are driven by four
independent sound signals, and the vibration component in the circumferential direction with
respect to the outer side wall of the acoustic diaphragm 401 Excites the acoustic diaphragm 401,
and at this time, each vibration component according to the four types of audio signals efficiently
propagates along the grid direction and is difficult to propagate in the direction orthogonal to the
grid .
[0131]
That is, in the speaker device 400, the vibration components of the four actuators 208 are mixed
by attaching the four actuators 208 so that the excitation direction is aligned with the grid
direction of the acoustic diaphragm 401. To avoid the crosstalk and to reduce the crosstalk
significantly.
[0132]
Incidentally, the speaker device 400 (FIG. 19) is connected to the cord 210 for supplying four
types of audio signals from the outside and supplying them to the four actuators 208 and the
three speaker units 204, for example, the legs It is also assumed that it is used in a state of being
attached to the wall of a room or the like via 403.
[0133]
In the speaker device 400, although not shown, a power supply battery and an amplifier are
housed inside the acoustic diaphragm 401, and the speaker device 400 is made to function as an
active speaker.
However, the power supply battery, the amplifier, and the like need not necessarily be
accommodated, and the power supply battery, the amplifier, and the like may function only as
passive speakers that are not built in.
10-05-2019
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[0134]
Also in this speaker device 400, [2-3.
As described in the frequency characteristics of the sound pressure level due to the difference in
material], the one having the acoustic diaphragm 401 in which wood is used as the material is
better than the one having the acoustic diaphragm in which resin such as acrylic is used as the
material. Due to the grain size, vibration propagation damping in the circumferential direction is
increased.
[0135]
Therefore, in the speaker device 400, since the acoustic diaphragm 401 in which the
circumferential direction matches the grid direction is used, the surrounding of the vibration
component in the vertical direction is reduced in the acoustic diaphragm 401, and the crosstalk
is significantly reduced. can do.
[0136]
Further, also in the speaker device 400, the configuration of the drive system is basically the
same as that of the speaker device 200, and thus the description thereof is omitted for the sake
of convenience.
[0137]
[3−3.
Operation of Speaker Device] Subsequently, the operation of the speaker device 400 (FIGS. 16 to
20) will be described.
[0138]
In the speaker device 400, four actuators 208 (208A to 208D) provided inside the acoustic
diaphragm 401 are driven by the left audio signal AL and the right audio signal AR, and vibration
10-05-2019
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components directed in the circumferential direction of the acoustic diaphragm 401 The acoustic
diaphragm 401 is excited by the
[0139]
At this time, the acoustic diaphragm 401 is excited by a longitudinal wave, and an elastic wave
(vibration) propagates in the circumferential direction through the acoustic diaphragm 401.
Then, when the elastic wave propagates through the acoustic diaphragm 401, mode conversion
of longitudinal waves, transverse waves, longitudinal waves, ... is repeated to become a mixed
wave of longitudinal waves and transverse waves, and the plane of the acoustic diaphragm 401 is
generated by the transverse waves. Vibration in the inward direction (direction perpendicular to
the surface) is excited.
[0140]
Thus, the speaker device 400 emits a sound wave from the surface of the acoustic diaphragm
401.
That is, the speaker device 400 can obtain an audio output of a high range from the outer
surface of the acoustic diaphragm 401.
[0141]
In the speaker apparatus 400, since the lower end face of the acoustic vibration diaphragm 401
does not contact the installation surface of the floor due to the legs 403, the middle to low-range
sound output from the three speaker units 204 attached to the plate 201A. Because the duct 209
and the through hole 402 form a bass reflex port, the bass range can be increased.
[0142]
[3−4.
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Lighting Effect in Speaker Device] In this speaker device 400 (FIG. 18), the lower part of the
acoustic diaphragm 401 is irradiated with irradiation light from a total of 12 LED elements 207
attached to the plate 201A, thereby the acoustic diaphragm It is possible to obtain a lighting
effect that causes light to leak around the light source 401 and brighten it.
[0143]
As a result, since the speaker device 400 has a configuration in which the appearance does not
look like a speaker, it is an audio output means, but an interior illumination means such as a
lamp on a bedside of a room or indirect illumination of a room It can also be used as
[0144]
[3−5.
Operation and Effects] In the above configuration, the speaker device 400 utilizes the anisotropy
of the acoustic diaphragm 401 having a frusto-conical shape, and with respect to the grid
direction of the acoustic diaphragm 401 formed so that the grain becomes horizontal. The four
actuators 208 are attached so as to match the direction of excitation.
[0145]
Thus, the speaker device 400 not only changes the shape of the acoustic diaphragm 401 but also
the anisotropy of the acoustic diaphragm 401 as a parameter for changing the frequency
characteristics of the sound wave surface shape and the sound pressure level radiated from the
acoustic diaphragm 401. It is possible to add the propagation direction of the sound wave by the
above, and to expand the control area of the sound image localization and the sense of spread.
[0146]
In addition, the speaker device 400 drives the four actuators 208 by four types of independent
audio signals, and the acoustic diaphragm is subjected to the vibration component in the
circumferential direction (square direction) with respect to the side wall on the outer peripheral
side of the acoustic diaphragm 401 I tried to excite 401.
[0147]
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As a result, in the speaker device 400, the respective vibration components according to the four
types of audio signals are efficiently propagated along the grid direction of the acoustic
diaphragm 401, and uniform throughout the entire circumferential direction of the acoustic
diaphragm 401. A sound image can be formed.
[0148]
Furthermore, in the speaker device 400, four actuators 208 are attached so that the excitation
direction is aligned with the grid direction of the acoustic diaphragm 401. The propagation loss
in the orthogonal direction is large, and the mixing of the vibration components can be avoided.
Thus, crosstalk can be prevented and good acoustic characteristics can be obtained.
[0149]
The speaker device 400 can make the light leak and brighten also around the acoustic
diaphragm 201 by the irradiation light from a total of 12 LED elements 207 attached to the plate
401A.
[0150]
Thus, the speaker device 400 can function as an audio output unit capable of obtaining the
above-described good acoustic characteristics with the crosstalk prevented, and can also function
as an interior lighting unit.
[0151]
According to the above configuration, the speaker device 400 makes use of the anisotropy of the
acoustic diaphragm 401 having a frusto-conical shape formed so that the grain is horizontal, and
the speaker device 400 can be added to the grid direction of the acoustic diaphragm 401. By
attaching the four actuators 208 so as to match the vibration direction, crosstalk due to mixing of
the respective vibration components by the four actuators 208 can be prevented in advance to
obtain good acoustic characteristics. it can.
[0152]
<4.
Other Embodiments> In the first embodiment described above, the side wall is added in the
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direction of arrow H with respect to the lower side wall of the acoustic diaphragm 201 on the
outer peripheral side of the acoustic diaphragm 201. There has been described the case where a
total of four actuators 208 for swinging are attached in a ring of 90 degree intervals.
However, the present invention is not limited to this, and as shown in FIG. 21, the side wall is
excited in the arrow J direction with respect to the ceiling portion of the side wall of the acoustic
vibration plate 201 as shown in FIG. The actuator 208 may be attached in an annular shape with
a 90 degree interval, for example, three, six, eight, etc., or various other numbers.
[0153]
Further, as shown in FIG. 22, an actuator 208 for exciting the side wall in the direction of arrow
H with respect to the lower side of the side wall on the outer peripheral side of the acoustic
vibration plate 201 is 90 degrees apart For example, three, six, eight, etc. may be attached in the
form of an annular ring.
[0154]
Further, as shown in FIG. 23, an actuator 208 for exciting the side wall in the direction of arrow
K with respect to the side wall forming the through hole 202 of the acoustic diaphragm 201
outside the acoustic diaphragm 201. May be attached in the form of a ring of 90 degree
intervals, for example, three, six, eight, etc.
[0155]
Further, in the second embodiment described above, the side wall is excited in the
circumferential direction with respect to the height position of the four steps with respect to the
side wall on the outer peripheral side of the acoustic vibration plate 401 inside the acoustic
vibration plate 401 A total of four actuators 208 for mounting are described.
However, the present invention is not limited to this, and as shown in FIG. 24, the side wall is
located outside the acoustic diaphragm 401 with respect to the height position of four steps with
respect to the side wall on the outer surface side of the acoustic diaphragm 401. A total of four
actuators 208 for exciting in the circumferential direction may be attached.
[0156]
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Furthermore, in the first and second embodiments described above, the case where the acoustic
diaphragms 201 and 401 made of wood are used is described, but the present invention is not
limited thereto. The acoustic diaphragms 201 and 401 made of resin, carbon, and various other
materials may be used as long as they can be made to have physical anisotropy with respect to a
predetermined direction such as the grid direction.
[0157]
Furthermore, in the first and second embodiments described above, the case where the acoustic
diaphragms 201 and 401 having a truncated cone shape are used is described.
However, the present invention is not limited to this, and as long as it is a material having
physical anisotropy, such as a pipe shape or a plate shape, an acoustic diaphragm having various
other shapes may be used.
[0158]
Furthermore, in the first and second embodiments described above, the case has been described
in which the acoustic diaphragms 201 and 401 in the state in which the grid direction is aligned
in the vertical direction or the circumferential direction are used.
However, the present invention is not limited to this, and a plurality of block materials are pasted
in the unaligned state of the grain, and cut out therefrom, a state in which various grain
directions such as the grain direction and the board direction are mixed The acoustic diaphragm
of may be used.
[0159]
Furthermore, in the first and second embodiments described above, the case where the ducts
209 and 409 are configured has been described.
However, the present invention is not limited to this, and the ducts 209 and 409 may not be
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configured if the through holes 202 and 402 do not need to function as a bass reflex port.
[0160]
Furthermore, in the first and second embodiments described above, the case where the speaker
apparatus of the present invention is configured by the acoustic diaphragms 201 and 401 as the
acoustic diaphragm and the actuator 208 as the excitation means is described. .
However, the present invention is not limited to this, and the speaker apparatus may be
configured by an acoustic diaphragm and an excitation unit having other various configurations
and shapes.
[0161]
The speaker apparatus of the present invention is, for example, a lighting apparatus mainly used
as an interior, and can also be applied to a lighting apparatus in which an audio output means is
incorporated.
[0162]
1, 100, 110, 120, 200, 340, 350, 400 ... speaker device, 2 ... pipe, 3, 101 ... base housing, 4, 103,
208, 342, 343, 352, 353 ... actuator , 5 ... opening portion 6, 6 204 ... speaker unit, 102, 112,
122, 201, 341, 351, 401 ... acoustic diaphragm, 114 ... storage hole, 202, 402 ... through hole,
203, 403: legs, 207: LED elements, 209, 409: ducts, 301: DSP blocks, 302, 303: amp blocks, 310,
320: attenuators, 311, 321: signal processing units, 312 , 322 ... low pass filter.
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