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JP2004166064

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DESCRIPTION JP2004166064
An inner panel (1) and a speaker device (SP) are provided which minimize the cost burden by
devising the shape and arrangement of parts already provided in a door panel. An inner panel (1)
includes an opening (2) to which a speaker unit is attached, a volume (3) for storing a speaker
unit from the opening and forming a closed space, and a volume And a through groove (4).
[Selected figure] Figure 1
Inner panel and speaker device
TECHNICAL FIELD [0001] The present invention belongs to the technical field of an inner panel
and a speaker device. [0002] In order to suppress the occurrence of vibration of the inner panel
of the vehicle, the conventional vehicle-mounted speaker device installs a Hermholtz resonator
and attenuates the generated vibration so as not to generate an unnecessary sound. (See, for
example, Patent Document 1). However, in the above-mentioned technology, in order to absorb
sound waves of different frequencies, a plurality of Helmholtz resonators are installed. Since it is
necessary, the number of parts increases, and there is a problem that manufacturing cost
becomes high. The problem to be solved by the present invention is to construct a Hermholtz
resonator by devising the shape and arrangement of parts already provided in a door panel, and
to minimize the cost burden on the inner panel and the vehicle The provision of a speaker device
is mentioned as an example. The present invention is described below. In addition, in order to
make an understanding of this invention easy, the referential mark of an accompanying drawing
is added in parentheses, but thereby, this invention is not limited to the form of illustration. In
order to solve the above problems, an inner panel (1) according to claim 1 stores an opening (2)
to which a speaker unit (6) is attached, a speaker unit (6), and a closed space. A volume (3) to be
formed and a groove (4) penetrating between the volume (3) are provided. In order to solve the
above problems, the speaker device (SP) according to claim 3 is an inner panel (1) in a speaker
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device (SP) in which a speaker unit (6) is attached to an inner panel (1). A speaker unit is
mounted between an opening (2) and a volume (3) that houses the speaker unit (6) from the
opening (2) and forms a closed space, and the volume (3) is The speaker unit (6) is
accommodated in the volume (3), and the back space of the speaker unit (6) in the volume (3) is
used as an acoustic volume. It features. BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an inner panel and a speaker device according to the present
invention will be described using an inner panel for a vehicle and a speaker device for a vehicle
as an example using the drawings. FIG. 1 is a perspective view showing a vehicle-mounted
speaker device SP in which a speaker unit 6 is attached to an inner panel 1 for a vehicle
according to an embodiment of the present invention, and FIG. 2 shows an embodiment of the
present invention. It is a perspective view showing a part of inner panel 1 for vehicles before
speaker unit 6 is attached.
Generally, a vehicle door has a double structure for storing window glass, and an inner panel for
mounting a window glass elevating mechanism is provided inside the vehicle door so that the
window glass can be moved up and down. Here, the inner panel for a vehicle has a hole called a
service hole while securing strength for maintenance and weight reduction of the door. An inner
panel 1 for a vehicle according to an embodiment of the present invention includes an opening 2
to which a speaker unit 6 is attached, a storage 3 for storing the speaker unit 6, and a groove 4
connected to the storage 3. It is configured to have Moreover, it has service holes 5a and 5b. The
opening 2 has a size sufficient to store the speaker unit 6, and screw holes 7 a, 7 b and 7 c for
fixing the speaker unit 6 are provided around the opening 2. Further, in order to prevent the flow
of air before and after the speaker unit 6, the surface around the opening 2 in contact with the
packing (not shown) of the speaker unit 6 is a surface without unevenness. The storage unit 3
stores the speaker unit 6, and an acoustic volume unit is formed in the space on the back surface
of the speaker unit 6. The acoustic volume acts as an acoustic compliance to impede the
movement of the loudspeaker. That is, when the acoustic volume is large, the reproduction limit
is dominated by the lowest resonance frequency of the speaker, and when small, it is dominated
by the acoustic compliance. Therefore, the volume (depth) of the storage unit 3 is determined in
a range in which the reproduction limit of the speaker does not make the listener feel
uncomfortable. Furthermore, in order to prevent raindrops from the upper window glass (not
shown) and sound from the back of the speaker unit 6 from being emitted into the door panel,
there is no hole at the back. The groove 4 has a size (width and depth) sufficient to act as a sound
pipe also through the wire harness 8. Moreover, the lid | cover 10 is provided in the state by
which the terminal part 9 was opened, and the pipe part is comprised. The end portion 9 is
disposed at a position where it is not closed in a state where the vehicle inner panel 1 is attached
to the door panel. The lid 10 is provided with a fixture 11 for fixing the wire harness 8 of the
speaker unit 6. The inner panel 1 for a vehicle is manufactured by integral molding of, for
example, a resin or a composite resin such as FRP (fiberglass reinforced plastics).
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Here, for example, the in-vehicle speaker apparatus SP according to the present embodiment is
the speaker apparatus according to the present invention, the vehicle inner panel 1 is the vehicle
inner panel according to the present invention, and the opening 2 is the present invention. The
storage section 3 constitutes a volume section according to the present invention, the groove
section 4 constitutes a groove section according to the present invention, and the fixing tool 11
constitutes fixing means according to the present invention. The phenomenon when the onvehicle speaker device SP having the above configuration emits a sound will be described below.
When the speaker unit 6 emits a sound in response to an audio signal, the sound emitted from
the diaphragm in the speaker propagates to the front of the speaker and the sound of the
opposite phase propagates to the rear of the speaker. By the way, since the speaker unit 6
according to the present embodiment is stored in the storage portion 3 of the inner panel 1 for a
vehicle, the sound propagated backward does not spread to the internal space of the door panel,
and the inside of the acoustic volume portion You will be smiling. As a result, the vibration of the
door panel is also reduced. Here, the resonance of Helmholtz will be described. The natural
frequency [[Hz] of the resonant sound of a container having a shape in which a thinner and
shorter tube (neck) is attached to a body having a somewhat larger volume like a medicine bottle
is given by the following equation It is generally known to be obtained. Here, the volume of the
body is V [m <3>], and the cross-sectional area of the neck is S [m <2>]. The length of the neck is
l [m], the speed of sound is c [m / s], and Δl is the correction of the open end of the neck,
assuming that the effective radius of the neck is a, Δl = The amount is about 1.5a to 1.7a. As
understood from (Equation 1), even if there is no neck portion (l = 0), it can be understood that
the shape having a hole in the body acts as a resonator. That is, the storage portion 3 according
to the present embodiment acts as a resonator without a neck portion having the groove portion
4 connected as an open end, and the natural frequency 11 [Hz] of the resonance sound is a
modification of (Expression 1) It is given by (Formula 2) below. Here, S1 [m <2>] is the crosssectional area of the cylinder. [Img class = "EMIRef" id = "19809702-00004"]
As understood from (Expression 2), the natural frequency 11 when the storage section 3 acts as
a resonator can be adjusted by manipulating the cross-sectional area S1 and the volume V of the
cylinder. Next, the groove 4 constitutes an acoustic tube. That is, a Hermholtz resonator is
configured by a combination of the storage portion 3 and the groove portion 4, and the natural
frequency 22 [Hz] of the resonance sound is given by (Expression 3) similar to (Expression 1). As
can also be understood from (Expression 3), the characteristic of the Helmholtz resonator
composed of the storage portion 3 and the groove portion 4 can be understood from (Expression
3) <img class = "EMIRef" id = "19809702-000005" /> The frequency ν2 can be adjusted by
manipulating the volume V of the trunk, the cross-sectional area S of the neck, and the length l of
the neck. Further, since the storage portion 3 is a closed space and there is little air flow, the
groove portion 4 connected to the storage portion 3 also causes resonance. The resonance
frequency of the groove 4 may be open at both ends or open at one end when the storage unit 3
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is closed. The resonance frequency in the low frequency band includes the resonance frequency
33 [Hz] in the case of both ends open, the resonance frequency 44 [Hz] of the first harmonic in
the case of one end open, and the resonance frequency 55 [Hz] of the third harmonic , (Equation
4) below. As can also be understood from (Expression 4), the resonance frequencies 3 3, 4 4 and
ν 5 of the resonance sound at the groove portion 4 are necks, as can be seen from (Expression
4) <img class = "EMIRef" id = "19809702-000006" The adjustment can be made by manipulating
the length l. Therefore, it becomes possible to adjust the resonance frequencies 1 1 and 2 2 of
the Hermholtz resonator and the resonance frequencies 3 3, 4 4 and 5 5 of the acoustic tube by
manipulating the shape of the storage part 3 and the groove 4, continuously It is possible to
suppress the generation of vibration noise in a wide band. Note that the material, thickness,
shape, etc. of the door panel, or the mounting position of the speaker differs depending on the
type of vehicle, and the vibration intensity also differs. Therefore, the shape (length) and
arrangement of the groove 4 are determined by experiment for each type of vehicle. The above
embodiment has the following effects. Of the vibrations that the driver feels uncomfortable,
sounds in the low frequency range of 50 Hz to 200 Hz can be suppressed by the vehicle inner
panel 1 and the in-vehicle speaker device SP according to the present embodiment, and the
driver feels discomfort Can be reduced.
The resonance frequency ヘ ル ム 1 of the Helmholtz resonance in the storage 3, the resonance
frequency 22 of the Helmholtz resonance by the combination of the storage 3 and the groove 4,
and the natural frequencies 33, 、 4 and 55 of the resonance sound in the groove 4 It is possible
to suppress the generation of vibration noise in a continuous band. Adjustment of the resonance
frequency 11 of Helmholtz resonance in the storage unit 3 is adjustment of the cross-sectional
area S1 and volume V of the storage unit 3 to adjust the resonance frequency 22 of Helmholtz
resonance by the combination of the storage unit 3 and the groove 4 The adjustment of the
natural frequencies 3 3, 4 4 and 5 5 of the resonance sound in the groove 4 is made by adjusting
the length l of the groove 4 by adjusting the volume V of the storage 3 and the cross section S of
the groove and the length 1 Can be done by Since the back surface of the speaker unit 6 is stored
in the storage unit 3, the sound propagated to the rear of the speaker unit 6 does not spread to
the internal space of the door panel. As a result, it is possible to reduce the vibration of the door
panel. The embodiment is not limited to the above, and may be modified as follows, for example.
The frame portion of the speaker unit 6 may be configured to be closed in a state where the end
portion 9 of the groove 4 is opened. By omitting the independent part of the lid 10, it is possible
to reduce the cost of the part attachment operation, part management, and the like. ○ A sound
absorbing material may be provided in the storage unit 3. The reverberation due to standing
waves can be reduced, and more faithful reproduction can be approached. The fixing of the
speaker unit 6 is not limited to screwing, and adhesion, leaf spring, and hook fixing may be used.
Further, the securing of the confidentiality of the speaker unit 6 is not limited to the packing, but
may be a sealing agent application. The fixation of the lid 10 is not limited to screwing, and may
be adhesion or hook fixation. In the embodiment of the inner panel and the speaker device
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according to the present invention, the present invention has been described by taking the inner
panel 1 for a vehicle and the in-vehicle speaker device SP as an example, but the present
invention is not limited to this. It is applicable if it is a structure which attaches a speaker unit to
an inner panel, for example, it is applicable to a door panel of a mobile, such as a panel of a
motorcycle, and a door panel of a ship. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a
perspective view showing an on-vehicle speaker device SP in which a speaker unit 6 is attached
to an inner panel 1 for a vehicle according to an embodiment of the present invention. FIG. 2 is a
perspective view showing a vehicle inner panel 1 before the speaker unit 6 is attached in the
embodiment of the present invention.
[Description of the code] SP: automotive speaker device 1: inner panel for vehicle 2: opening 3:
storage 4: groove 6: 6: speaker unit 9: end 10: lid 11: fixture
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