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JP2005096630

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005096630
The present invention provides an acoustic device capable of achieving low cost and light weight
and capable of reproducing bass. SOLUTION: An acoustic device 400 provided in an instrument
panel portion 100 in which a phosphorus hose 410 having a hollow portion is provided, and
speaker attachment members 420L and 420R having a hollow portion whose base end is in
communication with the phosphorus hose 410. The speaker mounting members 420L and 420R
are provided with openings at the tip end side thereof, and the speakers 430L and 430R that
emit a sound to the outside of the instrument panel unit 100 are provided. The hollow portion of
the phosphorus hose 410 and the hollow portions of the speaker attachment members 420L and
420R are used as resonance portions for resonating the sounds emitted by the speakers 430L
and 430R. [Selected figure] Figure 2
Acoustic device
[0001]
The present invention relates to, for example, an acoustic device provided in a structure in which
a reinforcing member having a hollow portion is disposed.
[0002]
Heretofore, acoustic devices provided in automobiles are known.
In addition, in an automobile in which the indoor space is limited, in order to make the indoor
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space wider, there is known a configuration in which an acoustic device is provided at a door
portion (for example, Patent Document 1).
[0003]
In the configuration of Patent Document 1, the door portion is provided with a speaker and a
speaker mounting portion having a substantially hollow truncated cone shape for holding the
speaker. This speaker is mainly used to reproduce bass, and the larger the diameter, the better
the bass reproduction capability.
[0004]
Japanese Utility Model Publication 7-33089
[0005]
However, if the diameter of the speaker is increased, the bass reproduction capability can be
improved, but the cost of the speaker increases and the weight of the speaker also increases.
For this reason, in a small car such as, for example, a liter car having large cost and weight
limitations, there is a problem that it is difficult to adopt a 14 cm diameter or 16 cm diameter
speaker having a large diameter and high bass reproduction ability. In addition, when a speaker
is provided in the door portion, a waterproof cover for the speaker is required. For this reason,
the problem that the weight of a car becomes heavy is also mentioned as an example.
[0006]
An object of the present invention is to provide an acoustic device capable of achieving cost
reduction and weight reduction and capable of reproducing bass.
[0007]
The invention according to claim 1 is an acoustic device provided in a structure in which a
reinforcing member having a hollow portion is disposed, the speaker emitting a sound to the
outside of the structure, and the speaker on the tip side And a speaker attachment member
whose base end is in communication with the reinforcement member, and the speaker
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attachment member has a hollow portion in communication with the hollow portion of the
reinforcement member, and the hollow portion is the speaker It is an acoustic device
characterized in that it is a resonance unit for resonating the sound emitted by
[0008]
Hereinafter, an embodiment of the present invention will be described based on the drawings.
FIG. 1 is a plan view of a vehicle provided with the acoustic device according to the present
embodiment.
FIG. 2 is a perspective view showing the arrangement of the acoustic device. FIG. 3 is a partial
cross-sectional perspective view showing a schematic configuration of the acoustic device.
[0009]
[Configuration of Sound Device] In FIG. 1, reference numeral 1 denotes a car as a moving body.
The automobile 1 includes an instrument panel (hereinafter referred to as an instrument panel)
portion 100 as a structure. And this instrument panel part 100 is provided with the main body
200, the operation display part 300, the acoustic apparatus 400, the control part which is not
shown in figure, etc., as shown in FIG.
[0010]
Although not shown here, main body 200 is formed, for example, in a shape in which a
substantially flat resin material is bent in a substantially U-shaped cross section. The main body
200 is disposed in the room of the automobile 1 such that a substantially U-shaped opening is
located in front of the automobile 1. And this main body 200 is provided with the upper surface
part 210, the front part which is not shown in figure, and a lower surface part.
[0011]
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The upper surface portion 210 is formed in a substantially elongated rectangular shape. In the
following description, one end in the longitudinal direction of the upper surface portion 210 is
referred to as the left end, the other end in the longitudinal direction is referred to as the right
end, and the approximate center in the longitudinal direction is referred to as the center. The
upper surface portion 210 is provided with phosphorus hose holes 211L and 211R, two speaker
holes (not shown), and the like.
[0012]
The phosphorus hose hole 211 </ b> L is provided in the vicinity of the left end of the top
surface 210. The phosphorus hose hole 211L is formed in a substantially circular shape having a
diameter substantially equal to the diameter of a duct 412L of a phosphorus hose 410 (described
later) of the acoustic device 400. The phosphorus hose hole 211 </ b> R is provided in the
vicinity of the right end of the top surface 210. The phosphorus hose hole 211L is formed in
substantially the same shape as the phosphorus hose hole 211R.
[0013]
The speaker holes are provided adjacent to the center side of the top surface 210 with respect to
the phosphorus hose holes 211L and 211R. These speaker holes are formed in a substantially
circular shape having a diameter substantially equal to the diameter of a speaker 430 of the
acoustic device 400 described later. Further, in the vicinity of these speaker holes, screw holes
(not shown) into which screws (not shown) for attaching the speaker 430 are screwed are
formed.
[0014]
The front part is provided with an arrangement part, an air conditioning blowout hole, etc. which
are not illustrated. The operation display unit 300, various switches for air conditioning and the
like (not shown), and instruments indicating the number of revolutions of the engine, the speed
of the vehicle, and the like are disposed in the installation unit.
[0015]
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As described above, the operation display unit 300 is disposed in the arrangement portion of the
front portion (not shown) of the main body 200. The operation display unit 300 includes a
display unit 310, a tuning knob 320, a volume knob 330, and the like.
[0016]
The display unit 310 is formed in a substantially rectangular shape. The display unit 310 is
disposed substantially at the center of the front surface of the operation display unit 300. The
display unit 310 displays the frequency of the radio, the magnitude of the sound emitted from
the acoustic device 400, and the like. As the display unit 310, for example, a liquid crystal or an
organic electro luminescence (EL) panel can be exemplified.
[0017]
The tuning knob 320 is formed in a substantially cylindrical shape, for example, by a material
such as plastic. The tuning knob 320 is disposed on the front lower left of the operation display
unit 300 so as to be rotatable in the circumferential direction.
[0018]
The volume knob 330 is formed of the same member as the tuning knob 320. The volume knob
330 is disposed at the front lower right of the operation display unit 300 and is rotatable in the
circumferential direction.
[0019]
Note that the arrangement position, material, shape, and the like of the display unit 310, the
tuning knob 320, and the volume knob 330 are not limited to the above-described configuration,
and may be other configurations as appropriate. Further, the tuning knob 320 and the volume
knob 330 may be configured by the same member.
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[0020]
The control unit is connected to the display unit 310, the tuning knob 320, the volume knob
330, the acoustic device 400, and the like. The control unit controls the operation of the display
unit 310, the acoustic device 400, and the like by the operation of the tuning knob 320, the
volume knob 330, and the like. Specifically, when the tuning knob 320 or the volume knob 330
is operated, the control unit controls the display unit 310 to cause the display unit 310 to display
various information. Further, when the tuning knob 320 is operated, the control unit changes the
frequency of the radio received by an antenna not shown. Then, the control unit outputs a signal
corresponding to the sound of the radio received by the antenna, the music reproduced by the
reproduction device, etc. to the acoustic device 400. In addition, although mentioned later in
detail, the acoustic device 400 emits the sound corresponding to the signal from a control part.
In addition, when the volume knob 330 is operated, the control unit changes the magnitude of
the output of the signal. Thereby, the magnitude of the sound emitted from the acoustic device
400 is controlled.
[0021]
The acoustic device 400 converts the signal output from the control unit into sound and emits
the sound. Further, as shown in FIG. 1 to FIG. 3, the acoustic device 400 includes a phosphorus
hose 410, speaker attachment members 420L and 420R, speakers 430L and 430R, tweeters
440L and 440R, and the like.
[0022]
The phosphorus hose 410 is formed in a substantially cylindrical shape from a material such as
metal which is not easily deformed by an external impact. In addition, although the structure
which formed the phosphorus hose 410 in substantially cylindrical shape is illustrated here, it
does not restrict to this but it is good also as other shapes suitably, such as substantially
rectangular cylindrical shape and substantially flat cylindrical shape, for example. In addition, the
ring hose 410 may have a short cylindrical shape or the like. The phosphorus hose 410 includes
a substantially linear phosphorus hose main body 411, and duct portions 412L and 412R
provided by bending the both ends of the phosphorus hose main body 411 at substantially right
angles, and the planar shape thereof is substantially U-shaped It is done. Further, as shown in
FIG. 3, the ring hose main body 411 is formed substantially in the shape of a disc at substantially
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the center in the axial direction, and the sound wave passing through the hollow portion on one
end side of the phosphorus hose main body 411 and the hollow portion on the other end side An
interference blocking member 413 is provided to block the interference with sound waves. In
addition, although the structure which made the interference prevention member 413 into
substantially disk shape was illustrated here, it is not restricted to this, The structure will be
questioned if it is the thickness which obstruct | occludes the approximate center of the
phosphorus hose main body 411 and blocks interference of a sound wave. Absent. In the
following, the hollow portion of the phosphorus hose main body 411 and the hollow portion of
the duct portion 412L on one end side of the interference blocking member 413 are the
resonance portion 414L, and the hollow portion of the phosphorus hose main body 411 on the
other end side and the hollow portion of the duct portion 412R This will be described by
appropriately referring to the resonance portion 414R.
[0023]
The phosphorus hose 410 is a reinforcing member disposed inside the main body 200 and
reinforcing the instrument panel portion 100. Specifically, the phosphorus hose 410 is disposed
such that the axial direction of the phosphorus hose main body 411 is substantially parallel to
the longitudinal direction of the upper surface portion 210 of the main body 200. Further, the
phosphorus hose 410 is joined from the lower surface of the upper surface portion 210 to the
rims of the phosphorus hose holes 211L and 211R at the tip end portions of the duct portions
412L and 412R. As a result, the resonance portion 414L of the phosphorus hose main body 411
is communicated with the outside of the main body 200 through the phosphorus hose hole 211L.
Similarly, the resonance portion 414R of the phosphorus hose main body 411 is in
communication with the outside of the main body 200 through the phosphorus hose hole 211R.
[0024]
The speaker attachment members 420 </ b> L and 420 </ b> R are formed of the same material
as the phosphorus hose 410 in a substantially cylindrical shape. Here, although the configuration
in which the speaker attachment members 420L and 420R are formed in a substantially
cylindrical shape is illustrated, the present invention is not limited to this, for example, a
substantially square cylindrical shape, a substantially flat cylindrical shape, or the like may be
used. In addition, the speaker mounting members 420L and 420R may have short cylindrical
shapes or the like. Further, in the following, the hollow portions of the speaker attachment
members 420L and 420R will be appropriately referred to as the resonance portions 421L and
421R. The speaker attachment members 420L and 420R have cylindrical ends substantially
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equal to the outer diameter of the phosphorus hose main body 411, and the outer diameters of
the phosphorus hose main body 411 and the speakers 430L and 430R can be fitted. It has a
cylindrically formed distal end portion 423L, 423R and connecting portions 424L, 424R for
connecting the proximal end portions 422L, 422R and the distal end portion 423L, 423R,
respectively.
[0025]
The speaker mounting members 420L and 420R are joined from the lower surface of the upper
surface portion 210 to the periphery of the respective speaker holes at the tip end portions 423L
and 423R such that the axial direction is substantially parallel to the axial direction of the duct
portions 412L and 412R. And is joined to the circumferential surface of the phosphorus hose
main body 411 at the proximal end portions 422L and 422R. Thereby, the resonance portion
421L of the speaker attachment member 420L is communicated with the outside of the main
body 200 through the resonance portion 414L of the phosphorus hose main body 411 and the
speaker hole portion of the upper surface portion 210. Similarly, the resonance portion 421R of
the speaker attachment member 420R is in communication with the outside of the main body
200 through the resonance portion 414R of the phosphorus hose main body 411 and the
speaker hole of the upper surface portion 210. The speaker attachment members 420L and
420R may be integrally formed with the phosphorus hose 410, or may be separately
manufactured and joined by welding or the like.
[0026]
The speakers 430L and 430R are, for example, 10 cm diameter speakers in a full range. The
speakers 430L and 430R respectively include vibration generating units 431L and 431R,
vibrating units 432L and 432R, and the like.
[0027]
The vibration generating units 431L and 431R convert signals input from the control unit into
vibration and transmit the vibration to the vibrating units 432L and 432R. The vibration
generating units 431L and 431R respectively include housings 433L and 433R, a voice coil (not
shown), a magnetic body, and the like. The housings 433L and 433R are formed in a
substantially cylindrical shape by a metal material or the like. The voice coil is connected to the
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control unit by a wire (not shown). When the voice coil and the magnetic body receive a signal
from the control unit to the inside of the housings 433L and 433R and to the voice coil, the voice
coil and the magnetic body vibrate corresponding to the input signal. It arrange | positions,
respectively so that it may each transmit to vibration part 432L, 432R.
[0028]
The vibrating portions 432L and 432R include frames 434L and 434R, diaphragms 435L and
435R, and the like. The frames 434L and 434R hold the diaphragms 435L and 435R,
respectively. The frames 434L and 434R are formed in a substantially hollow truncated cone
shape. In the following, a portion forming a circle with a small diameter in the substantially
hollow truncated cone shape is referred to as a bottom portion circumference forming portion,
and a portion forming a circle with a large diameter is referred to as a top portion forming
portion. Protruding portions 436L and 436R, which protrude outward in the radial direction, are
respectively formed at substantially opposing positions across the center of the upper
circumferential forming portion in the upper circumferential forming portions of the frames
434L and 434R. . Screw holes 437L and 437R are respectively formed in the projecting portions
436L and 436R. A plurality of openings 438L, 438R are formed in the circumferential surface of
the frames 434L, 434R. The frames 434L and 434R are respectively joined to the casings 433L
and 433R of the vibration generating units 431L and 431R at the bottom circumference forming
portion. The diaphragms 435L and 435R respectively generate sound waves corresponding to
the vibrations transmitted from the vibration generating units 431L and 431R. The diaphragms
435L and 435R are formed, for example, of substantially the same shape as the frames 434L and
434R and substantially in the shape of a hollow truncated cone, for example, by a magnesium
thin plate or cone paper whose surface has been subjected to a corrosion resistance treatment.
The diaphragms 435L and 435R are fitted to the frames 434L and 434R, respectively.
[0029]
The speakers 430L and 430R are respectively fitted to the speaker attachment members 420L
and 420R from the upper surface of the upper surface 210 through the speaker holes so that the
vibrating portions 432L and 432R are on the upper side. As described above, by arranging the
speakers 430L and 430R, the inner peripheral surfaces of the diaphragms 435L and 435R of the
vibrating parts 432L and 432R are exposed to the outside of the main body 200. The speakers
430L and 430R are respectively fixed to the main body 200 by set screws (not shown)
respectively inserted into the screw holes 437L and 437R. When the speakers 430L and 430R
are fixed to the main body 200, space portions 450L and 450R are respectively formed between
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the speakers 430L and 430R and the tip portions 423L and 423R of the speaker attachment
members 420L and 420R. ing. Further, in this state, a part of the outer peripheral surface of the
diaphragm 435L, 435R is exposed to the space portions 450L, 450R from the openings 438L,
438R formed in the frames 434L, 434R, respectively.
[0030]
The tweeters 440L and 440R are, for example, small-sized speakers of 1.6 cm in diameter that
reproduce high tones. As shown in FIG. 1, the tweeter 440 L is disposed at the left end of the
upper surface portion 210, and the tweeter 440 R is disposed at the right end of the upper
surface portion 210. The tweeters 440L and 440R are respectively connected to the control unit
by conductors (not shown). Then, the tweeters 440L and 440R emit a sound corresponding to
the signal input from the control unit.
[0031]
In the embodiment as described above, as the speakers of the acoustic device 400, the speakers
430L and 430R corresponding to the full-range 10 cm diameter generally having a small
diameter are employed. For example, when a signal is input from the control unit to the voice coil
of vibration generation unit 431L of speaker 430L, this acoustic device 400 converts the input
signal into vibration with the voice coil and the magnetic body of vibration generation unit 431L.
Do. Then, the vibration generating unit 431L transmits the converted vibration to the vibrating
unit 432L. When vibration is transmitted from the vibration generation unit 431L, the vibration
unit 432L generates a sound wave in the speaker hole on the inner peripheral surface of the
diaphragm 435L. Thus, a sound is emitted from the speaker 430L to the outside of the
instrument panel 100. In addition, when vibration is transmitted from the vibration generation
unit 431L, the vibration unit 432L has an opposite phase to the sound wave generated in the
speaker hole on the outer peripheral surface of the diaphragm 435L exposed from the opening
438L of the frame 434L. Is generated in the space portion 450L of the speaker mounting
member 420L. Then, the sound waves generated in the space portion 450L are inverted in phase
and transmitted to the phosphorus hose hole portion 211L through the resonance portions 421L
and 414L. That is, on the outer peripheral surface of the diaphragm 435L, the vibrating portion
432L generates a sound wave in the same phase as the sound wave generated in the speaker
hole through the resonance portions 421L and 414L in the phosphorus hose hole 211L. As a
result, sound is also emitted from the duct portion 412L.
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[0032]
Thus, for example, the vibration unit 432L generates a sound wave in the speaker hole in the
diaphragm 435L. In addition, the vibrating portion 432L is a diaphragm 435L, through the
hollow portion of the speaker attachment member 420L and the phosphorus hose 410, that is,
the resonance portions 421L and 414L of the phosphorus hose 410, the acoustic wave of the
same phase as the acoustic wave generated in the speaker hole It is generated in the hole portion
211L. As a result, tube resonance occurs in the resonance portions 421L and 414L, and the
sound emitted from the duct portion 412L can be made more bass than the sound emitted from
the speaker 430L to the outside of the instrument panel portion 100 by the tube resonance. For
this reason, even if the small-diameter speakers 430L and 430R, which are difficult to reproduce
bass, can be used to reproduce bass, the cost and weight of the speakers 430L and 430R can be
reduced. Also, as a member that enables low-pitched sound reproduction, a reinforcing member
of a conventional structure is mainly used. Therefore, the number of parts and the weight of the
structure do not increase. Furthermore, since the speakers 430L, 430R are disposed in the
instrument panel portion 100, it is not necessary to provide the automobile 1 with a waterproof
cover of the speakers 430L, 430R. Therefore, it is possible to provide an acoustic device 400
capable of achieving low cost and light weight and capable of reproducing bass.
[0033]
Further, the speaker attachment members 420L and 420R are joined to the phosphorus hose
main body 411 of the phosphorus hose 410, and the speakers 430L and 430R are respectively
fitted to the speaker attachment members 420L and 420R. Further, an interference blocking
member 413 for blocking the interference between the sound wave passing through the
resonance portion 414L and the sound wave passing through the resonance portion 414R is
provided at substantially the center in the axial direction of the hollow portion of the phosphorus
hose body 411. As a result, the sound wave generated in the resonance portion 414L by the
speaker 430L does not interfere with the sound wave generated in the resonance portion 414R
by the speaker 430R. Therefore, by inputting different signals to the speakers 430L and 430R in
the control unit, it is possible to emit different sounds from the duct units 412L and 412R.
Therefore, the audio device 400 capable of stereo reproduction can be provided.
[0034]
The phosphorus hose 410 is joined from the lower surface of the upper surface 210 to the rims
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of the phosphorus hose holes 211L and 211R at the tip of the ducts 412L and 412R. Thereby,
for example, the resonance portion 414L of the phosphorus hose main body 411 is
communicated with the outside of the main body 200 through the phosphorus hose hole 211L.
Therefore, the acoustic device 400 can emit low-pitched sound to the outside of the instrument
panel portion 100, that is, the interior of the automobile 1 through the phosphorus hose hole
portion 211L in the duct portion 412L. For this reason, it is possible to make the driver and
passengers more experienced with the bass.
[0035]
For example, the speaker mounting member 420L is provided with a cylindrical tip portion 423L
larger than the outer diameter of the phosphorus hose main body 411 and into which the
speaker 430L can be fitted. Thus, when the speaker 430L is fixed to the main body 200, a space
450L is formed between the speaker 430L and the tip end 423L. Thus, by forming the space
portion 450L between the speaker 430L and the tip end portion 423L, the amount of low
frequency sound emitted from the duct portion 412L by tube resonance can be increased as
compared with the configuration in which the space portion 450L is not formed. . Therefore, it is
possible to provide the acoustic device 400 capable of more powerful bass reproduction.
[0036]
In the present embodiment, the structure is the instrument panel 100 of the automobile 1.
Thereby, the conventional phosphorus hose 410 having a function as a reinforcing member of
the main body 200 of the instrument panel portion 100 can be used as a component of the
acoustic device 400, and the above-described effects can be exhibited. Therefore, it is possible to
provide the automobile 1 provided with the acoustic device 400 capable of reproducing the bass
without increasing the cost and the weight.
[0037]
[Modification of the Embodiment] The present invention is not limited to the above-described
embodiment, and includes the following modifications as long as the object of the present
invention can be achieved.
[0038]
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The speaker mounting members 420L and 420R are joined to the phosphorus hose main body
411, the speakers 430L and 430R are respectively fitted to the speaker mounting members
420L and 420R, and the interference blocking member 413 is provided substantially in the axial
center of the hollow portion of the phosphorus hose main body 411. Although the configuration
is illustrated, the present invention is not limited to this. For example, the following configuration
may be employed.
That is, for example, only the speaker attachment member 420L may be joined at, for example,
the substantially central portion in the axial direction of the phosphorus hose body 411, and the
speaker attachment member 420L may be fitted to the speaker 430L. In this way, it is possible to
provide the acoustic device 400 capable of monaural bass reproduction without cost increase
and weight increase. Further, since the work of providing the interference blocking member 413
in the hollow portion of the phosphorus hose main body 411 can be omitted, the work of
assembling the acoustic device 400 can be facilitated, and the manufacturing cost can be
reduced.
[0039]
Although the configuration in which the phosphorus hose 410 is joined to the peripheral edge of
the phosphorus hose holes 211L and 211R from the lower surface of the upper surface 210 at
the tip end of the ducts 412L and 412R is illustrated, the present invention is not limited thereto.
It may be a configuration or the like. That is, the tip portions of the duct portions 412L and 412R
may be positioned inside the main body 200 without providing the phosphorus hose holes 211L
and 211R. In this way, the work of forming the phosphorus hose holes 211L and 211R in the
main body 200 and the work of joining the duct parts 412L and 412R and the phosphorus hose
holes 211L and 211R can be omitted. In addition, since it is not necessary to bend the
phosphorus hose 410, this operation can be omitted. Therefore, the manufacturing cost can be
further reduced.
[0040]
For example, a speaker mounting member 420L is provided with a tubular tip portion 423L
larger than the outer diameter of the phosphorus hose main body 411 and into which the
speaker 430L can be fitted, and a space portion 450L is provided between the speaker 430L and
the tip portion 423L. Although the configuration to be formed is illustrated, the present invention
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is not limited to this, and may have the following configuration, for example. That is, the shape of
the end portion 423L may be a truncated cone having substantially the same shape as the frame
434L of the speaker 430L, and the space portion 450L may not be formed between the speaker
430L and the end portion 423L. With such a configuration, the amount of material used to form
the tip portion 423L can be reduced, and cost reduction and weight reduction of the acoustic
device 400 can be realized.
[0041]
The structure is exemplified as the instrument panel portion 100 of the automobile 1. However,
the present invention is not limited to this. For example, the structure may be an instrument
panel such as an airplane or a ship, or a structure such as a rear dashboard of the automobile.
Further, the present invention is applicable to any structure in which a reinforcing member
having a hollow portion is disposed inside.
[0042]
The positions and shapes of the speaker hole and the ring hose holes 211L and 211R formed in
the main body 200 are not limited to the configuration of the above-described embodiment and
can be appropriately changed. For example, at least one of the speaker hole and the ring hose
holes 211L and 211R may be provided in the front and lower surfaces (not shown) of the main
body 200. Further, the positions of the speaker hole and the ring hose holes 211L and 211R may
be interchanged.
[0043]
EXPERIMENTAL EXAMPLE Next, an experimental example carried out to confirm the effect of
the embodiment will be described based on the drawings. FIG. 4 is a block diagram showing a
schematic configuration of a measurement system of this experiment. FIG. 5 is a perspective view
showing a schematic configuration of the acoustic device. FIG. 6 is a cross-sectional view showing
a schematic configuration of the acoustic device. FIG. 7 is a graph showing the evaluation results
of this experiment. In addition, about the member which has a function similar to the said
embodiment below, the same name is attached | subjected and the description is abbreviate |
omitted or simplified.
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[0044]
(Configuration of Measurement System) First, the configuration of the measurement system will
be described. In FIG. 4, 500 is a measurement system, and the measurement system 500 includes
a low frequency oscillator 510, an amplifier 520, a voltmeter 530, an acoustic device 540, a
microphone 550, an amplifier 560, and a recording device 570. Do not have a power supply, etc.
[0045]
The low frequency oscillator 510 is connected to a power supply and amplifier 520, not shown,
as shown in FIG. The low frequency oscillator 510 includes a frequency setting unit, a frequency
generation unit, and the like (not shown). The low frequency oscillator 510 is driven by a voltage
supplied from a power supply (not shown) and outputs a signal of the frequency set by the
frequency setting unit to the amplifier 520.
[0046]
The amplifier 520 is connected to the speaker 430 of the acoustic device 540, for example, by a
wire (not shown). The amplifier 520 amplifies the signal input from the low frequency oscillator
510 and outputs the amplified signal to the acoustic device 540.
[0047]
The voltmeter 530 is connected in parallel to, for example, a lead that connects the amplifier 520
and the acoustic device 540, for example, via a lead (not shown). The voltmeter 530 measures
the voltage input to the acoustic device 540.
[0048]
The acoustic device 540 converts the signal input from the amplifier into a sound wave and
outputs it. The acoustic device 540 is provided with a baffle 541 corresponding to the ring hose
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410, a speaker attachment member 542, a speaker 430, and the like.
[0049]
The baffle 541 is formed in a substantially cylindrical shape, for example, of a resin material or
the like as shown in FIG. In the following, the hollow portion of the baffle 541 will be
appropriately referred to as the resonance portion 541A. The baffle 541 is formed in a
substantially L shape in which one end side is bent substantially at a right angle. The baffle 541
includes a substantially cylindrical baffle main body 541B and a substantially cylindrical duct
portion 541C. The other end of the baffle body 541B is closed as shown in FIG.
[0050]
The speaker attachment member 542 is formed, for example, of a resin material or the like in a
substantially cylindrical shape. In the following, the hollow portion of the speaker attachment
member 542 will be referred to as the resonance portion 542A as appropriate. The speaker
attachment member 542 includes a proximal end 542B, a distal end 542C, and a connecting
portion 542D. The speaker mounting member 542 is joined to the circumferential surface of the
baffle main body 541B at the base end portion 542B such that the axial direction thereof is
substantially parallel to the axial direction of the duct portion 541C. Thereby, the resonance part
542A of the speaker attachment member 542 is communicated with the outside of the baffle
main body 541B via the resonance part 541A of the baffle main body 541B.
[0051]
The speaker 430 is fitted to the speaker attachment member 542 such that the vibrating portion
432 is at the top. In this state, a space 543 is formed between the speaker 430 and the end 542
C of the speaker attachment member 542. The voice coil provided in the vibration generating
unit 431 of the speaker 430 is connected to the amplifier 520 by a lead (not shown).
[0052]
The microphone 550 is disposed at a position 1 m away from the front of the speaker 430 of the
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acoustic device 540, as shown in FIG. In addition, the microphone 550 is connected to the
amplifier 560, for example, by a cable (not shown). The microphone 550 receives sound waves
emitted from the duct portion 541 C of the acoustic device 540 and the speaker 430. Then, a
signal corresponding to the received sound wave is output to the amplifier 560.
[0053]
The amplifier 560 is connected to the recording device 570 by, for example, a wire (not shown).
The amplifier 560 amplifies the signal input from the microphone 550 and outputs the amplified
signal to the recording device 570.
[0054]
The recording device 570 records the signal input from the amplifier 560.
[0055]
(Operation of Measurement System) Next, the operation of the measurement system 500 will be
described.
First, the low frequency oscillator 510 outputs a signal of a voltage corresponding to an arbitrary
frequency set by the frequency setting unit and corresponding to 1 W to the acoustic device 540
via the amplifier 520. Then, the acoustic device 540 emits a sound wave corresponding to the
signal from the duct portion 541C or the speaker 430. Then, the microphone 550 receives the
sound wave emitted from the sound device 540, converts the received sound wave into a signal,
and outputs the signal to the recording device 570 through the amplifier 560. The recording
device 570 records the signal input from the amplifier 560. Thereby, the sound pressure of the
sound wave of the arbitrary frequency emitted from the sound device 540 is recorded in the
recording device 570.
[0056]
(Method of Evaluating Sound Device) Next, a method of evaluating the sound device 540 will be
described. First, the measurement system 500 is disposed in the anechoic chamber. Then, with
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the opening of the duct portion 541 C of the acoustic device 540 closed, the low frequency
oscillator 510 outputs a signal having an arbitrary frequency and corresponding to 1 W to the
acoustic device 540. Then, the sound wave emitted from the acoustic device 540 is received by
the microphone 550, and the sound pressure is recorded by the recording device 570.
Thereafter, the frequency of the signal output from the low frequency oscillator 510 is
appropriately changed by the frequency setting unit of the low frequency oscillator 510, and the
sound pressure of the sound wave emitted from the acoustic device 540 is recorded by the
recording device 570. Next, in a state in which the opening of the duct portion 541C of the
acoustic device 540 is opened, the sound pressure of the sound wave emitted from the acoustic
device is recorded by the recording device 570 by the method described above. In the following,
the configuration in which the opening of the duct portion 541C is closed is referred to as the
configuration of the comparative example, and the configuration in which the opening of the
duct portion 541C is opened is referred to as the configuration of the present embodiment. Then,
the configuration of the comparative example recorded in the recording device 570 and the
characteristic curves in the configuration of the present embodiment are compared.
[0057]
(Evaluation Result of Sound Device) Finally, the evaluation result of the sound device 540 will be
described based on the drawings. A characteristic curve as shown in FIG. 7 was obtained by the
evaluation method described above. In FIG. 7, a solid line is a characteristic curve in the
configuration of the comparative example, and a dotted line is a characteristic curve in the
configuration of the present embodiment. As shown in FIG. 7, in the configuration of the present
embodiment, an improvement of 4 to 5 dB is obtained at 150 Hz to 400 Hz, which is highly
effective in terms of hearing in the low frequency region with frequency characteristics.
[0058]
[Operation and Effect of the Embodiment] In the embodiment as described above, the base end is
communicated with the phosphorus hose 410 to the acoustic device 400 provided in the
instrument panel portion 100 in which the phosphorus hose 410 having the hollow portion is
disposed. There are provided speaker mounting members 420L and 420R having hollow
portions, and speakers 430L and 430R disposed at openings on the tip side of the speaker
mounting members 420L and 420R and emitting sound to the outside of the instrument panel
portion 100. Further, the hollow portion of the phosphorus hose 410 is used as the resonance
portions 414L and 414R for resonating the sounds emitted by the speakers 430L and 430R.
Furthermore, the hollow portions of the speaker attachment members 420L and 420R are used
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as the resonance portions 421L and 421R that resonate the sounds emitted by the speakers
430L and 430R.
[0059]
With such a configuration, a sound is emitted from the speakers 430L and 430R to the outside of
the instrument panel unit 100. In addition, sounds emitted from the speakers 430L and 430R
and passing through the resonance portions 421L, 414L, 421R and 414R undergo tube
resonance in the resonance portions 421L, 414L, 421R and 414R. As a result, the sounds
emitted from the ducts 412L and 412R can be made more bass than the sounds emitted from the
speakers 430L and 430R to the outside of the instrument panel 100. For this reason, even if the
small-diameter speakers 430L and 430R, which are difficult to reproduce bass, can be used to
reproduce bass, the cost and weight of the speakers 430L and 430R can be reduced. Further, as
a member that enables low-pitched sound reproduction, a phosphorus hose 410, which is a
reinforcing member of the conventional instrument panel portion 100, is mainly used. Therefore,
the number of parts and the weight of the instrument panel 100 do not increase. Furthermore,
since the speakers 430L, 430R are disposed in the instrument panel portion 100, it is not
necessary to provide the automobile 1 with a waterproof cover of the speakers 430L, 430R.
Therefore, it is possible to provide an acoustic device 400 capable of achieving low cost and light
weight and capable of reproducing bass.
[0060]
It is a top view of the car in which the sound equipment in this embodiment was arranged. It is a
perspective view which shows the arrangement | positioning state of the acoustic apparatus in
the said embodiment. It is a partial cross section perspective view showing a schematic structure
of an acoustic device in the embodiment. It is a block diagram which shows schematic structure
of the measurement system used for the experiment for confirming the effect of the said
embodiment. It is a perspective view which shows schematic structure of the acoustic apparatus
in the said experiment. It is sectional drawing which shows schematic structure of the acoustic
apparatus in the said experiment. It is a graph which shows the evaluation result of the said
experiment.
Explanation of sign
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[0061]
DESCRIPTION OF SYMBOLS 1 Instrument panel part as automobile 100 structure as a moving
body 400 Sound device 410 Phosphorus hose 413 as a reinforcement member 414 interference
blocking member 414L, 414R, 421L, 421R Resonant part 420L, 420R Speaker attachment
member 430L, 430R Speaker 450L, 450R Space
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