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JP2010016766

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DESCRIPTION JP2010016766
The present invention provides an acoustic system using a speaker device which can suppress
the attenuation of high frequency sounds and the generation of standing waves and can enjoy
richer sound field expression according to the type of reproduced sound. SOLUTION: A first
diaphragm provided with a strip-shaped first reinforcing portion which is integrally formed with
each other using an isotropic material and which has a Young's modulus higher than that of a
second region portion in the first region portion. A second speaker unit having a first speaker
unit and a belt-like second reinforcement portion formed integrally with each other using an
isotropic material and having a Young's modulus higher than that of the fourth region portion in
the third region portion; Of the second speaker unit having the first and second speaker units
arranged side by side, and rotating the first diaphragm in the circumferential direction, the
direction of the first reinforcing portion , And amplification means; and rotation control means
for controlling driving of the rotation mechanism based on the audio signal. [Selected figure]
Figure 14
Sound system
[0001]
The present invention relates to acoustic systems.
[0002]
A recent audio device is a method of changing the signal processing method according to the
type of audio, in order to change the reproduction sound emitted from the speaker according to
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the type of audio such as classical music, popular music, movie sound, etc. Methods for changing
the arrangement and orientation of the device, etc. have generally been used.
For example, by freely moving the direction of the speaker fixed in the cabinet around the
vertical direction according to the type of audio, it is easy to operate and obtain a highly realistic
sound effect even in a relatively narrow place A possible sound field control device is known (see,
for example, Patent Document 1).
[0003]
However, in the sound field control device generally used conventionally, the output energy may
increase or decrease at the viewing point by rotating the speaker around the vertical direction. In
addition, due to the attenuation of high-range sound due to a change in directivity characteristics
and the occurrence of standing waves, in some cases, it may not be possible to enjoy high-density
sound field expression sufficiently. Japanese Patent Application Laid-Open No. 6-70389
[0004]
In view of the above problems, the present invention uses a speaker device that can suppress the
attenuation of high frequency sounds and the occurrence of standing waves, and enjoy richer
sound field expression according to the type of reproduced sound. Provide an acoustic system.
[0005]
In order to achieve the above object, an aspect of the present invention comprises a first region
portion and a second region portion integrally formed with each other using an isotropic
material, and the second region portion is formed in the second region. Speaker unit having a
first diaphragm provided with a band-like first reinforcing portion having a Young's modulus
higher than that of the first region, and a third region integrally formed with each other using an
isotropic material A second speaker unit having a second diaphragm including a portion and a
fourth region portion, and a band-like second reinforcing portion having a higher Young's
modulus than the fourth region portion in the third region portion A cabinet having the first and
second speaker units arranged side by side, and a pivoting mechanism for pivoting the first
diaphragm in its circumferential direction and changing the direction of the first reinforcing
portion. First and second speaker devices, and amplified audio signals Sound system comprising:
amplification means for supplying each of the speaker devices; and rotation control means for
controlling the drive of the rotation mechanism so that the first reinforcing portion faces a preset
direction based on the audio signal The point is that
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[0006]
According to the present invention, an acoustic system using a speaker device capable of
enjoying richer sound field expression according to the type of reproduced sound is provided
while suppressing attenuation of high frequency sounds and generation of standing waves. it can.
[0007]
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
[0008]
-Diaphragm-The example of the diaphragm 1 used for the speaker apparatus based on
embodiment of this invention is shown to Fig.1 (a) and FIG.1 (b).
[0009]
The diaphragm 1 includes a conical (cone) -shaped vibrating member 10 and a rubber edge 14
attached across the outer periphery of the vibrating member 10.
The vibrating member 10 is formed of an isotropic material (uniform material).
“Isotropic material (uniform material)” is different from wood and the like in which the sound
propagation speed differs depending on the fiber direction and the non-fiber direction, and the
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sound propagation speed is nearly equal in all directions in the diaphragm. Means material. In
the present embodiment, “isotropic material (uniform material)” refers to, for example, paper
such as pulp, plastic such as polypropylene, metal such as aluminum, and the like.
[0010]
The vibrating member 10 is disposed in the first region portion with the standard portion 12
(second region portion) disposed in the second region portion, integrated with the standard
portion 12, and directed from the small diameter side to the outer diameter side It has band-like
first direction reinforcing portions 13a and 13b and second direction reinforcing portions 13c
and 13d (first region portions) arranged radially.
[0011]
The first and second direction reinforcing portions 13a to 13d are regions pressed harder than
the standard portion 12 in the manufacturing process of the vibrating member 10 described
later, and the material density is about 10 to 100% of that of the standard portion 12 Is a high
area.
Although the material density varies depending on the material used, for example, when paper is
used as the vibrating member 10, the material density of the standard part 12 is about 0.4 to 0.7
g / cm <3>, and the first and second directions are used. The material density of the reinforcing
portions 13a to 13d is about 0.5 to 1.0 g / cm <3>.
[0012]
In addition, the first and second direction reinforcing portions 13a to 13d are regions that are
made stronger than the standard portion 12 by being pressed harder than the standard portion
12 in the manufacturing process of the vibrating member 10. The Young's modulus is controlled
to be about 5 to 15% higher than that of the standard part 12. The Young's modulus differs
depending on the material used. For example, when paper is used as the vibrating member 10,
the Young's modulus of the standard part 12 is about 1.2 to 2.0 Pa, and the first and second
direction reinforcing parts 13a to 13d Young's modulus of about 1.3 to 2.5 Pa.
[0013]
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Furthermore, the first and second direction reinforcing portions 13a to 13d have a thickness
different from that of the standard portion 12 by about 10 to 75% by being pressed harder than
the standard portion 12 in the manufacturing process of the vibrating member 10. ing. Although
the thickness differs depending on the material used, for example, in the vibrating member 10
shown in FIG. 1B, the thickness T1 of the standard part 12 is about 0.3 mm to 0.35 mm, and the
first and second direction reinforcing parts Thickness T2 of 13a-13d is about 0.2 mm-0.25 mm.
[0014]
FIG. 2 shows a comparison of propagation speeds of the standard part 12 and the first and
second direction reinforcing parts 13a to 13d when paper is used as the material of the vibrating
member 10. As shown in FIG. The propagation velocity (m / s) of the first and second direction
reinforcing portions 13 a to 13 d is formed to be about 5 to 10% higher than the propagation
velocity of the standard portion 12.
[0015]
FIG. 3 shows internal losses of the standard part 12 and the first and second direction reinforcing
parts 13a to 13d when paper is used as the material of the vibrating member 10. The internal
loss (tan δ) of the first and second direction reinforcing portions 13 a to 13 d is formed to be 3
to 10% higher than the propagation speed of the standard portion 12.
[0016]
As shown in FIG. 1A, the first direction reinforcing portions 13a and 13b are arranged side by
side in a first direction (vertical direction in the drawing) passing through the center of the
vibrating member 10. The second direction reinforcing portions 13 c and 13 d pass through the
center of the vibrating member 10 and are arranged side by side in a second direction (left and
right direction in the drawing) different from the first direction. In FIG. 1A, the first direction and
the second direction are set to intersect substantially perpendicularly at the center of the
vibrating member 10, but the invention is not limited thereto.
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[0017]
The number of first and second direction reinforcing portions 13 a to 13 d can be variously
changed according to the characteristics of the speaker system on which the vibration member
10 is mounted. For example, as shown in FIG. 4A, two first direction reinforcing portions 13a and
13b may be disposed in the vertical direction on the paper surface, or as shown in FIG. 4B, along
the oblique direction on the paper surface. The four first and second direction reinforcing
portions 13a to 13d may be disposed. As shown in FIG. 4C, the semicircular first and second
direction reinforcing portions 13a to 13d may be disposed, or as shown in FIG. 4D, from the
opening 11 toward the outer periphery. Three radial direction extending portions 13a to 13c
may be arranged.
[0018]
The shapes shown in FIGS. 5A to 5F can be adopted as the shapes of the first direction
reinforcing portions 13a and 13b. For example, as shown in FIGS. 5 (a) to 5 (c), by adopting a
shape in which the width in the longitudinal direction is gradually narrowed from the opening 11
side toward the outer peripheral side (not shown), A change can be given to the propagation
speed of the vibration (sound) transmitted through the one-direction reinforcing portions 13a
and 13b. As a result, due to the sense of hearing, the spread can be felt by the reproduced sound.
Of course, the shapes shown in FIGS. 5A to 5F can also be used for the shapes of the second
direction reinforcing portions 13c and 13d.
[0019]
As described above, according to the diaphragm 1 according to the embodiment of the present
invention, in the vibrating member 10, the Young's modulus and the internal loss are higher than
in the standard portion 12, and the first and second directions have high propagation speeds.
Reinforcement parts 13a-13d are arranged. That is, as illustrated in FIG. 6, a region having a
higher speed of sound than the standard portion 12 is formed along the longitudinal direction
(arrow direction) of the first and second direction reinforcing portions 13a to 13d. Gives an
impression of coming out more forward, which can enrich the sound field expression.
[0020]
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Furthermore, since the first and second direction reinforcing portions 13a to 13d are integrally
formed integrally with the standard portion 12 in press molding described later, the first and
second direction reinforcing portions 13a to 13d peel off from the vibrating member 10 As in
the case of surface processing with a laser beam, a part of the vibrating member 10 does not
ache. Also, by using an isotropic material such as paper, plastic, metal or the like as the material
of the vibrating member 10, it is possible to provide a diaphragm that is inexpensive and easy to
manufacture, and a standing wave generated when using an isotropic material Loss of output
energy due to the occurrence of
[0021]
The sizes (areas) of the first and second direction reinforcing portions 13a to 13d may not be the
same. For example, when the lower side of the paper surface of FIG. 1A is a mounting surface, the
surface area of the first direction reinforcing portions 13a and 13b is made larger than the
surface area of the second direction reinforcing portions 13c and 13d. The sound velocity in the
direction perpendicular to the mounting surface becomes faster, and a sense of hearing can be
obtained as the sound comes out more forward. On the other hand, when the area of the first
direction reinforcing portions 13a and 13b is smaller than the area of the second direction
reinforcing portions 13c and 13d, the auditory sense in which the sound spreads in the
horizontal direction with respect to the mounting surface can be obtained.
[0022]
FIGS. 7A and 7B show the evaluation results of the directional sensitivity characteristics of the
speaker using the diaphragm according to the present embodiment. In the directional sensitivity
characteristic test, a speaker using a diaphragm having no reinforcing portion was used as a
“conventional example”. The speakers according to the conventional example and the present
embodiment are placed on the turntable respectively, the microphone is placed at a distance of 1
m from the center of the turntable, and the turntable is rotated 360 degrees clockwise with the
front of the speakers at 0 degrees. The
[0023]
As shown in FIG. 7A, when the measurement frequency is 8 kHz, it can be understood that the
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range level is increased in all directions in the speaker according to the present embodiment as
compared with the conventional example. . As shown in FIG. 7B, when the measurement
frequency is 10 kHz, the range level output from the front side of the speaker using the
diaphragm according to this embodiment is the first and second direction reinforcing portions
13a. It can be seen that the rise is large compared to the diaphragm not having ~ 13d.
[0024]
FIG. 8A shows the frequency characteristics of the diaphragm without the first and second
direction reinforcing portions 13a to 13d, and FIG. 8B shows the frequency characteristics of the
diaphragm according to the present embodiment. . The sound pressure of the loudspeaker (see
FIG. 8 (b)) according to this embodiment is lower than that of the conventional example (see FIG.
8 (a)) when compared in the portion shown by the dotted line, that is It can be seen that it is
about 1 dB higher. When a curve showing frequency characteristics is observed, dips are formed
in the band of 2 to 3 kHz in FIG. 8A as a conventional example, but in the case shown in FIG. 8B
as the present embodiment, It can be seen that the curve is flatter than in 8 (a), and the
occurrence of peaks (dips) is suppressed.
[0025]
As described above, according to the diaphragm 1 according to the embodiment of the present
invention, the output level of the midrange including many vocal components can be increased
by arranging the first and second direction reinforcing portions 13a to 13d. It can be understood
that it is possible. Further, since the occurrence of peaks (dips) can be suppressed, according to
the present embodiment, it is possible to provide a speaker with particularly excellent sound
quality in the midrange.
[0026]
Next, a method of manufacturing the diaphragm 1 according to the present embodiment will be
described with reference to FIGS. 9 (a) to 9 (g). In addition, the manufacturing method shown
below is an example, and of course it can manufacture by various methods besides this.
[0027]
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First, as shown in FIG. 9A, the paper making apparatus 21 is placed in the pulp solution 20. On
the upper surface of the paper making device 21 is placed a net 22 having a central portion
formed in a cone shape (conical shape) in advance. The mesh 22 can be formed of a metal such
as Shinchu, but is not limited to this and any strong material having heat resistance can be used.
[0028]
As the pulp dissolving liquid 20, for example, 10 wt% of linter (cotton fiber) + 90 wt% of a mixed
fiber of NBKP pulp (a softwood fiber is pulped by the kraft method and the pulped fiber is
bleached) dispersed in water Pulp dissolvers are available. The paper making apparatus 21 is
provided with an opening 23 for discharging excess liquid from the lower side of the net 22 at
the time of paper making.
[0029]
Next, as shown in FIG. 9 (b), the paper making apparatus 21 is gradually pulled up onto the pulp
dissolving solution 20, and the paper product 24 is deposited on the net 22. Thereafter, hot air
or the like may be blown onto the paper product 24 in order to remove moisture from the paper
product 24 on the mesh 22. After drying the paper product 24, the paper product 24 is removed
from the mesh 22.
[0030]
As shown in FIG. 9C, the paper product 24 removed from the mesh 22 is sandwiched between a
press 28 composed of a heated male die 27 and a female die 26 as shown in FIG. 9D. , And press
with a predetermined pressure from the top of the male mold 27. Under the present
circumstances, since protrusion 27a, 27b is selectively formed in a part of male mold 27, the one
part area | region of the paper product 24 which contact | connects protrusion 27a, 27b is a
surrounding area other than that. It will be pressed harder than. If the pressing pressure is too
high, the paper product 24 may be damaged or it may affect various physical characteristics such
as the sound propagation speed of the paper product 24. In the case of FIG. 9C, for example, the
pressing pressure is preferably about 3 to 5 kPa.
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9
[0031]
As shown in FIG. 9E, the outer peripheral portion 25a of the workpiece 25 formed into a
predetermined shape is cut out. Subsequently, as shown in FIG. 9 (f), the rubber edge 14 is
attached over the entire periphery of the outer periphery of the work 25, the inner periphery 15
is punched out, and as shown in FIG. 9 (g) The diaphragm 1 having the opening 11 and the
rubber edge 14 attached to the outer periphery is manufactured.
[0032]
According to the diaphragm 1 according to the present embodiment, collective pressing is
performed so that the pressing pressure of a specific portion of the paper product 24 becomes
strong by the press molding process, and the standard portion 12 and the first and second
direction reinforcing portions 13a to 13d is manufactured. Therefore, as compared with the case
where the diaphragm is processed by laser light or the like, it is possible to manufacture a
diaphragm that is easy to manufacture and has a high product yield.
[0033]
(Modification) FIG. 10 shows an example of a diaphragm 100 according to a modification of the
embodiment. The diaphragm 100 according to the modification differs from the diaphragm 1
shown in FIG. 1A and FIG. 1B in that a cap 38 is attached to the opening 11. The other parts are
substantially the same as those of the diaphragm 1 shown in FIGS.
[0034]
The cap 38 includes a band-shaped reinforcing area 38a having a longitudinal direction in the
same direction as the first direction reinforcing portions 13a and 13b and a standard area 38b
around the reinforcing area 38a. The material of the cap 38 is preferably an isotropic material
such as paper, plastic, metal or the like. The reinforcing area 38a and the standard area 38b are
formed integrally by press molding.
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[0035]
The reinforced area 38a is an area pressed harder than the standard area 38b, and is an area
having a high material density by about 10 to 100% as compared with the standard area 38b.
When paper is used as the material of the cap 38, the material density of the standard area 38b
is about 0.4 to 0.7 g / cm <3>, and the material density of the reinforced area 38a is about 0.5 to
1.0 g / cm <3. Is>. The Young's modulus of the reinforced area 38a is about 5 to 15% higher than
that of the standard area 38b. When paper is used as the material of the cap 38, the Young's
modulus of the standard area 38b is about 1.2 to 2.0 Pa, and the Young's modulus of the
reinforcing area 38a is about 1.3 to 2.5 Pa.
[0036]
Further, the reinforced area 38a has a thickness different from that of the standard area 38b by
being pressed more strongly than the standard area 38b in the pressing process at the time of
manufacture. In the vibrating member shown in FIG. 10, the thickness of the standard area 38b
is about 0.3 mm to 0.35 mm, and the thickness of the reinforcing area 38a is about 0.2 mm to
0.25 mm.
[0037]
The shape of the reinforcing area 38a is not particularly limited. For example, as shown in FIG.
11A, the reinforcing area 38a may be formed in a strip shape extending in a first direction
passing the center of the cap 38. As shown in FIG. 11B, a V-shaped reinforcing area 38a may be
formed, or as shown in FIG. 11C, a cross-shaped reinforcing area 38a may be formed.
[0038]
According to the diaphragm 1 according to the first modification, in addition to the vibrating
member 10, the reinforcing area 38a and the standard area 38b are disposed also for the cap 38.
As a result, the sound velocity of the sound transmitted through the cap 38 can be changed
depending on the position, so the generation of standing waves seen when an isotropic member
is adopted can be suppressed, and richer sound field expression can be realized. Become.
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[0039]
-Sound System-Fig. 12 shows an example of a sound system according to the embodiment of the
present invention. The sound system shown in FIG. 12 includes a main body 6, a speaker device
(L speaker device 4a, R speaker device 4b) connected to the main body 6, and a turning
mechanism not shown in FIG.
[0040]
In the L speaker device 4a, a first speaker unit 3a having a diaphragm 1a and a second speaker
unit 3b having a diaphragm 1b are vertically arrayed on the front surface of the cabinet 2a. The
first direction reinforcing portions 13a and 13b of the diaphragm 1a are disposed so as to face in
the vertical direction (vertical direction) with respect to the mounting surface. The second
direction reinforcing portions 13c and 13d of the diaphragm 1a are disposed so as to be inclined
approximately 45 degrees with respect to the vertical direction. The first direction reinforcing
portions 13a and 13b of the diaphragm 1b are arranged to face in the vertical direction (vertical
direction) with respect to the mounting surface. The second direction reinforcing portions 13c
and 13d of the diaphragm 1b are arranged to face in a parallel direction (horizontal direction)
with respect to the mounting surface.
[0041]
In the R speaker device 4b, a first speaker unit 3c having a diaphragm 1c and a second speaker
unit 3d having a diaphragm 1d are vertically arranged on the front surface of the cabinet 2b. The
first direction reinforcing portions 13a and 13b of the diaphragm 1c are arranged to face in the
vertical direction (vertical direction) with respect to the mounting surface. The second direction
reinforcing portions 13c and 13d of the diaphragm 1c are arranged to be inclined approximately
45 degrees with respect to the vertical direction. The first direction reinforcing portions 13a and
13b of the diaphragm 1d are arranged to face in the vertical direction (vertical direction) with
respect to the mounting surface. The second direction reinforcing portions 13c and 13d of the
diaphragm 1d are arranged to face in a parallel direction (horizontal direction) with respect to
the mounting surface.
[0042]
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In caps provided at central portions of the diaphragms 1a to 1d, strip-like reinforcing regions
38a directed in the vertical direction are respectively arranged. By arranging the reinforcement
area 38a, the standing wave is suppressed, and the output of the midrange is made stronger, the
sound spreads in the vertical direction, and the auditory sense that the sound comes out more
forward It can be given to the user.
[0043]
As described above, by making the width in the lateral direction of the first direction
reinforcements 13a and 13b larger than the width in the lateral direction of the second direction
reinforcements 13c and 13d, the sense of sound spreading in the vertical direction is obtained. It
can be strong. Conversely, by making the width in the lateral direction of the second direction
reinforcements 13c and 13d larger than the width in the lateral direction of the first direction
reinforcements 13a and 13b, it is possible to strengthen the sense of sound spreading in the
horizontal direction.
[0044]
In the L speaker device 4a and the R speaker device 4b shown in FIG. 12, the width in the short
direction of the first direction reinforcing portions 13a and 13b is greater than the width in the
short direction of the second direction reinforcing portions 13c and 13d. Of about 5 to 20%.
Thus, a high quality speaker can be provided as a speaker for music appreciation, and the
speaker can be sufficiently used as a realistic home theater speaker.
[0045]
FIG. 13 is a cross-sectional view showing an example of the first speaker unit 3a. The first
speaker unit 3a includes a magnetic circuit 34 including a doughnut-shaped plate 35, a
doughnut-shaped magnet 36 provided below the plate 35, and a pole piece 30, and a frame 33
disposed on the magnetic circuit 34; A diaphragm 1a fixed to a frame 33 is provided. 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 b and the frame 33. The diaphragm 1 a has a
vibrating member 10 having a cone (conical) shape in cross section, and a rubber edge 14
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attached all around the outer peripheral portion (edge) of the vibrating member 10. The rubber
edge 14 is fixed to the frame 33 via a gasket 39.
[0046]
The first speaker unit 3a is provided with a rotation mechanism 300 for rotating the diaphragm
1a in the circumferential direction of the diaphragm 1a with the center of the diaphragm 1a as
the rotation axis. For example, as shown in FIG. 13, the pivoting mechanism 300 is pivotally
supported by the fixing portion 301 for fixing the first speaker unit 3a, the shaft portion 302
connected to the fixing portion 301, and the shaft portion 302, A rotation chamber 303 is
provided for fixing the first speaker unit 3a and rotating the front surface of the first speaker
cabinet 3a as a rotation surface with the shaft portion 302 as a rotation axis. The pivoting
chamber 303 may have a substantially hemispherical shape in addition to the shape as shown in
FIG. 12, or may be directed from the shaft portion 302 to the side surface of the first speaker
unit 3a and the end of the frame 33, respectively. It may be configured by a plurality of band-like
holding members extending radially, and various other known devices can be used. The pivoting
chamber 303 is accommodated in a recess 200 provided in the cabinet 2a, and is rotatable inside
the recess 200 with the shaft portion 310 as a rotation axis. A motor or the like (not shown) for
moving the shaft portion 302 in a predetermined direction is connected to the tip of the shaft
portion 302, and the drive of the shaft portion 302 is controlled. Of course, the pivoting
mechanism 300 in FIG. 11 is merely an example, and various other known pivoting mechanisms
300 can be used.
[0047]
The rotation angle (rotation angle) of the rotation mechanism 300 is controlled by a rotation
control unit 62 (see FIG. 14) described later. For example, in the case where the audio system
shown in FIG. 12 is used as a system for stereo reproduction of 2ch, left and right audio signal
(Lch) identical to each other is used in the first and second speaker units 3a and 3b of the L
speaker device 4a. , And from the main body 6 via the lines L1 and L2. The same right channel
audio signal (Rch) is input to the first and second speaker units 3c and 3d of the R speaker device
4b from the main body 6 via the lines L3 and L4.
[0048]
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14
In order to give a sense of unity to the first and second speaker units 3a and 3b for reproduction,
the first direction reinforcing portions 13a and 13b and the reinforcing area 38a are disposed so
as to be aligned in the direction perpendicular to the mounting surface It is preferable to do.
Therefore, the rotation mechanism 300 rotates the first speaker units 3a and 3c (diaphragms 1a
and 1c) to orient the first direction reinforcements 13a and 13b and the reinforcement area 38a
in the direction perpendicular to the mounting surface. Align. Although FIG. 12 illustrates an
example in which the first speaker units 3a and 3c rotate, all the speaker units 3a to 3d may be
rotatable.
[0049]
When the audio system shown in FIG. 12 is used as a reproduction system of 5ch surround
signals, the left speaker signal (surround Lch) and center channel from the main body 6 through
the line L1 are provided to the first speaker unit 3a. A signal (center ch) is input. The left channel
front signal (front L ch) is input from the main body 6 to the second speaker unit 3b via the line
L2. The right channel surround signal (surround R ch) and the center channel signal (center ch)
are input to the first speaker unit 3c from the main body 6 through the line L3. The right channel
front signal (front R ch) is input from the main body 6 to the second speaker unit 3d via the line
L4.
[0050]
In this case, in order to give a sense of unity to the first and second speaker units 3a to 3d for
reproduction, the directions of the first direction reinforcing portions 13a and 13b and the
reinforcing area 38a are aligned in the direction perpendicular to the mounting surface It is
desirable to place in In addition, for the first speaker units 3a and 3c, in order to produce a
surround effect, positively arrange portions (reinforcing portions) having a high sound velocity in
a direction slightly oblique to the vertical direction to the mounting surface. Is preferred. In this
case, the pivoting mechanism 300 pivots the directions of the first direction reinforcing portions
13a and 13b and the reinforcing area 38a obliquely at, for example, approximately 45 degrees
with respect to the vertical direction.
[0051]
As described above, according to the sound system of the embodiment, the rotation mechanism
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300 rotates the center of the diaphragms 1a and 1c as the rotation axis according to the form of
the reproduction system (input voice), and The direction of the direction reinforcing portions
13a, 13b and the reinforcing area 38a is changed. As a result, it is possible to easily enjoy
various sound field expressions according to the type of input audio signal with the same speaker
units 4a and 4b. In addition, it occurs when the pivoting mechanism 300 is pivoted about the
vertical direction by pivoting the pivots 300 with the centers of the diaphragms 1a and 1c having
the first and second direction reinforcing portions 13a to 13d as the pivot. It is also possible to
suppress the attenuation of high frequency sounds and the occurrence of standing waves. The
pivoting mechanism 300 may be electrically controlled by an acoustic system described later, or
may be moved manually.
[0052]
FIG. 14 shows an example of a block diagram of an acoustic system according to an embodiment.
The L speaker device 4a is connected to the first speaker unit 3a, the second speaker unit 3b, the
motor 7a connected to the first speaker unit 3a, and the first speaker unit 3a, and the rotation
state of the diaphragm 1a And a voltage converter 8a for detecting the
[0053]
The R speaker device 4b is connected to the first speaker unit 3c, the second speaker unit 3d, the
motor 7b connected to the second speaker unit 3b, and the first speaker unit 3c, and rotates the
diaphragm 1c. A voltage converter 8b for detecting the state is provided. The first and second
speaker units 3a to 3d are connected to a signal processing device (DSP) 18 via amplifiers 17a to
17d. The voltage converters 8a and 8b are connected to the control device (control means) 60
via the A / Ds 16a and 16b.
[0054]
Control device 60 includes a speaker ch control unit 61 and a rotation control unit 62. The
speaker channel control unit 61 controls the first and second speaker units 3a to 3d based on the
reproduction mode information input through the operation unit 63 or the remote control
reception unit 64 or the input audio signal input to the DSP 18. Control the supply form of the
audio signal to be input. The rotation control unit 62 controls the motors 7a and 7b which drive
the first and second speaker units 3a to 3d, and also detects the first and second speaker units 3a
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to 3 detected by the voltage converters 8a and 8b. The diaphragms in the first and second
speaker units 3a to 3d are rotated in a predetermined direction based on the 3d position
information to control the directions of the first and second direction reinforcing portions 13a to
13d.
[0055]
An example of the operation of the acoustic system shown in FIG. 14 will be described using the
flowchart shown in FIG. First, in step S 1, reproduction mode information, input sound signal
(sound signal) information, and the like are input to the control device 60 via the operation unit
63 or the remote control reception unit 64. For example, when the sound system of FIG. 13 is
used as a system for stereo reproduction of 2 ch, the speaker ch control unit 61 outputs the
same left channel audio signal to the first and second speaker units 3a and 3b of the L speaker
device 4a. While allocating Lch), the same right channel audio signal (Rch) is allocated to the first
and second speaker units 3c and 3d of the R speaker device 4b.
[0056]
The speaker channel control unit 61 inputs to the DSP 18 control information for causing the
first and second speaker units 3c and 3d to reproduce Lch and Rch. The DSP 18 processes an
input audio signal based on the control information input from the speaker channel control unit
61.
[0057]
In step S3, the rotation control unit 62 drives the motor 7a in accordance with the type of
reproduction mode information, and controls the first and second direction reinforcing portions
13a to 13d to face a predetermined direction. For example, when using the sound system of FIG.
14 as a system for stereo reproduction of 2ch, the rotation control unit 62 drives the motors 7a,
7b, etc., and the direction of the first direction reinforcing portions 13a, 13b is vertical. The
diaphragms 1a and 1c are turned to face. The rotation information of the first speaker units 3a
and 3c is converted into voltage values by the voltage converters 8a and 8b, and is input to the
rotation control unit 62 via the A / Ds 16a and 16b.
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[0058]
In step S4, the rotation control unit 62 reads the rotation information of the first speaker units
3a and 3c and the preset value, and the direction (rotation angle) of the first and second direction
reinforcing portions 13a to 13d is It is determined whether or not it is within the set value range.
If the rotation angle is not the set value, the process returns to step S3 to rotate the first speaker
units 3a and 3c again. If the rotation angle = the set value, the process proceeds to step S5, and
the reproduction of the audio signal is started from the first and second speaker units 3a and 3b.
[0059]
According to the sound system of the embodiment, the control device 60 performs the first
operation such that the first speaker units 3a and 3c turn in the preset direction according to the
type of the input sound signal and the reproduction mode. Since the rotation of the speaker units
3a and 3c is electrically controlled, an acoustic system with easy control of the sound field can be
provided.
[0060]
(Arrangement Example) FIG. 16 shows an arrangement example of the first and second direction
reinforcing portions 13a to 13d arranged in the speaker devices 4a and 4b.
[0061]
As shown in FIG. 16 (a), the longitudinal directions of the first direction reinforcing portions 13a
and 13b and the reinforcing area 38a of the first and second speaker units 3a and 3b are
substantially the same as the mounting surface of the speaker device 4a. By arranging in the
horizontal direction, the sound velocity in the horizontal direction is faster than in the other
regions.
As a result, it is possible to create a sound field that emphasizes the spread of sound in the
horizontal direction.
If the same audio signal is input to the first and second speaker units 3a and 3b in FIG. 16A, the
sound emitted from the speaker device 4a can be made to have a sense of unity.
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[0062]
As shown in FIG. 16B, the first direction reinforcements 13a and 13b of the first and second
speaker units 3a and 3b and the direction of the reinforcement area 38a are substantially
perpendicular to the mounting surface of the speaker device 4a. By arranging in such a manner,
the speed of sound in the vertical direction is faster than in other regions. As a result, when, for
example, a surround signal for the left channel of the reproduction system of 5ch surround signal
is input to the first speaker unit 3a of FIG. 16 (b), a sound may come out to the front of the
speaker device 4a. It can give the user a sense of hearing. On the other hand, when the speaker
device 4a of FIG. 16 (b) is used as a 2ch stereo reproduction speaker, the same audio signal is
input to the first and second speaker units 3a and 3b. The sense of unity can be given to the
reproduction sound emitted from the second speaker units 3a and 3b.
[0063]
As shown in FIG. 16C, the first direction reinforcing portions 13a and 13b of the first speaker
units 3a and 3b and the reinforcing area 38a are disposed to be inclined with respect to the
mounting surface. This makes it possible to create a sound field diffused in the horizontal and
diagonal directions.
[0064]
As shown in FIG. 16 (d), the direction of the first direction reinforcements 13a and 13b and the
reinforcement area 38a is directed in the horizontal direction with respect to the mounting
surface to obtain a sound field that emphasizes the spread of sound in the horizontal direction.
Can be produced.
[0065]
As shown in FIG. 16 (e), by orienting the first direction reinforcing portions 13a and 13b and the
reinforcing area 38a in the direction perpendicular to the mounting surface, a sound field which
emphasizes the spread of sound in the vertical direction can be obtained. Can be produced.
[0066]
(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
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19
form a part of this disclosure, limit the present invention.
[0067]
In the acoustic system shown in FIG. 12, although the example which provided reinforcement
area | regions 38a-38d as diaphragm 1a-1d is shown, reinforcement area | regions 38a-38d do
not need to be sufficient.
Further, in FIG. 12, one speaker unit may be arranged in each of the L speaker device 4a and the
R speaker device 4b, or three or more speaker units may be arranged vertically.
[0068]
Although the conical (cone-shaped) vibration member 10 has been described as an example in
FIGS. 1 to 15, as shown in FIGS. 17 and 18, a vibration member 50 having a dome-shaped cross
section can also be used.
[0069]
The speaker unit 9 shown in FIG. 17 includes a magnetic circuit 91, a housing portion 92 for
housing the magnetic circuit 91, the diaphragm 5 disposed on the magnetic circuit 91, and a
frame 93 for fixing the diaphragm 5.
The speaker unit 9 is connected to a rotation mechanism 94, and the diaphragm 5 is rotatable in
the circumferential direction of the diaphragm with the center of the diaphragm as a rotation
axis.
[0070]
The diaphragm 5 has a vibrating member 50 having a dome-shaped cross section, and a cloth
edge 54 formed on the entire outer circumference of the vibrating member 50.
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As the vibrating member 50, the above-mentioned isotropic material, silk, cotton, hemp, chemical
fiber, resin film or the like can be used.
[0071]
The vibrating member 50 has a standard portion 50b and a reinforcing portion 50a provided in a
band shape at the central portion.
The reinforcing portion 50a is a region pressed stronger than the standard portion 50b in the
manufacturing process, and has a material density higher by about 10 to 100% than the standard
portion 50b. When paper is used as the material of the vibrating member 50, the material
density of the standard part 50b is about 0.4 to 0.7 g / cm <3>, and the material density of the
reinforcing part 50a is about 0.5 to 1.0 g / cm <3> It is. The Young's modulus of the reinforcing
portion 50a is about 5 to 15% higher than that of the standard portion 50b. The Young's
modulus of the standard part 50b is about 1.2 to 2.0 Pa, and the Young's modulus of the
reinforcing part 50a is about 1.3 to 2.5 Pa. Also, the thickness of the standard portion 50b is
about 0.04 mm to 0.3 mm, and the thickness of the reinforcing portion 50a is about 0.02 mm to
0.25 mm.
[0072]
The shape of the reinforcing portion 50a is not particularly limited. For example, substantially
the same shape as the reinforcing area 38a shown in FIGS. 11 (a) to 11 (c) can be employed.
[0073]
Since the curvature of the dome portion of the vibrating member 50 is relatively large, peeling is
likely to occur, for example, when a material having a sound velocity faster than that of the
diaphragm material is attached on the surface of a general diaphragm. According to the
diaphragm according to the third modification, since the reinforcing portion 50a and the
standard portion 50b are integrated by press molding, the reinforcing portion 50a does not peel
off from the surface of the vibrating member 50. In addition, since the vibrating member 50 is
not damaged by forming by pressing, compared to the case where the surface of the vibrating
member 50 is processed by a chemical solution, laser or the like, the diaphragm 5 maintaining
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stable quality for a long time can be obtained.
[0074]
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.
[0075]
Fig.1 (a) is a top view which shows the diaphragm concerning embodiment of this invention,
FIG.1 (b) is sectional drawing at the time of seeing from the AA direction of Fig.1 (a).
It is a graph which shows the propagation speed of the reinforcement part which concerns on
embodiment of this invention, and a standard part. It is a graph which shows the internal loss of
the reinforcement part which concerns on embodiment of this invention, and a standard part. It
is a top view which shows the example of arrangement | positioning of the reinforcement part
which concerns on embodiment of this invention. It is a top view which shows the example of a
shape of the reinforcement part which concerns on embodiment of this invention. It is an
explanatory view explaining the characteristic of the oscillating member concerning an
embodiment of the invention. FIG. 7A is a graph showing the measurement result of the 8 kHz
directivity, and FIG. 7B is a graph showing the measurement result of the 12 kHz directivity. FIG.
8 (a) is a graph showing frequency characteristics of the conventional example, and FIG. 8 (b) is a
graph showing frequency characteristics of the loudspeaker according to the embodiment of the
present invention. It is process sectional drawing or top view which shows the manufacturing
method of the diaphragm which concerns on embodiment of this invention. It is a top view which
shows the diaphragm concerning the 1st modification of an embodiment of the invention. It is a
top view which shows the example of a shape of a reinforcement area | region. It is a schematic
diagram showing an example of a sound system concerning an embodiment of the invention. It is
a sectional view showing an example of a speaker unit concerning an embodiment of the
invention. It is a block diagram showing an example of a sound system concerning an
embodiment of the invention. It is a flowchart which shows an example of operation | movement
of the acoustic system which concerns on embodiment of this invention. It is a figure which
shows the other example of arrangement | positioning of the speaker apparatus based on
embodiment of this invention. It is sectional drawing of the speaker apparatus based on other
embodiment of this invention. FIG. 18 (a) is a plan view of a diaphragm according to another
embodiment, and FIG. 18 (b) is a cross-sectional view of FIG. 18 (a) as viewed from the B-B
direction.
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Explanation of sign
[0076]
DESCRIPTION OF SYMBOLS 1, 1a-1d ... diaphragm 2a ... cabinet 2b ... cabinet 3a, 3c ... 1st
speaker unit 3b, 3d ... 2nd speaker unit 4a ... L speaker apparatus 4b ... R speaker apparatus 5 ...
diaphragm 6 ... main body 7a , 7b: motor 8a, 8b: voltage converter 9: speaker unit 10: vibrating
member 11: opening 12: standard portion 13a, 13b: first direction reinforcing portion 13c, 13d:
second direction reinforcing portion 14: rubber edge 15: Inner circumference 17a to 17d:
Amplifier 18: DSP 20: Pulp dissolving liquid 21: paper making apparatus 22: mesh 23: opening
24: paper making 25: work 26: female type 27: male type 28: press machine 30: pole piece 31a,
31b: voice coil 32: damper 33: frame 34: magnetic circuit 35: plate 36: magnet 37: magnetic Gap
38: Cap 38a: Reinforcement area 38b: Standard area 39: Gasket 50: Vibration member 60:
Control device 61: Speaker channel control section 62: Rotation control section 63: Operation
section 64: Remote control reception section 91: Magnetic circuit 92 ... Storage part 93 ... Frame
94 ... Rotation mechanism 100 ... Diaphragm 200 ... Concave portion 300 ... Rotation mechanism
301 ... Fixed part 302 ... Shaft part 303 ... Rotation chamber
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