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JP2000228793

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DESCRIPTION JP2000228793
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
bass reflex / speaker device, and more particularly to a bass reflex / speaker device that can be
mounted on a vehicle such as a motorcycle or the like used outdoors.
[0002]
2. Description of the Related Art In an audio speaker system, it is known to invert the phase of
the sound coming from the back and put it on the front. This is to give an acoustic effect to
resonate the sound with the bass by a hole formed in the front of the sealed speaker box, and is
called a bass reflex speaker. The resonant frequency is determined by the size of the hole or port
and the length of the tube or resonant duct attached to the port.
[0003]
There is known one in which the duct is provided toward the inside of an enclosure forming an
acoustic space, and one in which the duct protrudes outward from the enclosure (for example,
Japanese Utility Model Laid-Open Publication No. 61-154092). The duct facing inward takes out
the resonance sound reflected at the back of the enclosure from the duct to improve the bass
reproduction, and the duct facing outwards further makes the duct a wall with high bass. It is for
preventing interference or changing the frequency characteristic depending on the installation
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place.
[0004]
FIG. 8 is a sectional view of the duct directed to the inside of the enclosure, and FIG. 9 is a
sectional view of the duct projecting outward from the enclosure. In both figures, a speaker 32 is
attached to the panel portion 31 of the enclosure 30, and a duct 33 is disposed below the
speaker 32. When a speaker system having such a configuration is mounted on a two-wheeled
vehicle etc., water may enter the interior of the enclosure 30 from the duct 33 due to a car wash
or rain, and the water W once entered the enclosure 30 is an enclosure Actually, it was difficult
to adopt such a speaker system for a two-wheeled vehicle because there is a possibility that it
would be accumulated at the bottom of the 30.
[0005]
In addition, when mounting an audio speaker on a two-wheeled vehicle having a cowl, the
following should be noted. During the traveling of the vehicle, the inside of the cowl is under
negative pressure, and a difference in air pressure occurs on the front and back of the speaker
cone paper, that is, the diaphragm. For this reason, there is a problem that corn paper is biased to
the rider side and the sound quality is deteriorated. In order to solve this problem, it is
conceivable to apply a bias current corresponding to the air pressure difference to the voice coil
(for example, JP-A-63-211899). However, as the method of supplying bias current complicates
the system, a simpler method is desired.
[0006]
The present invention solves the above-mentioned problems, makes it possible to prevent
flooding and facilitate the discharge of water when flooded, and is also suitable for preventing
deterioration of sound quality, such as a bass reflex that can be mounted on equipment used
outdoors such as a motorcycle -It aims at providing a speaker apparatus.
[0007]
SUMMARY OF THE INVENTION The present invention for achieving the above object comprises
an enclosure for accommodating a speaker to form an acoustic space, and an enclosure located
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on the front side of the speaker at the lowermost end of the enclosure. A first feature of the
present invention is that it comprises a resonant duct, and the resonant duct has an opening
whose directivity direction is set in a range from the front horizontal direction to the vertical
lower side of the speaker.
In addition to the first feature, the present invention further comprises a speaker box covering
the enclosure, the speaker box having a front surface and a receding surface formed to be
inclined from the front surface, and the resonance The duct has a second feature in that the duct
projects outward from the receding surface. Furthermore, the present invention has a third
feature in that the speaker box is formed by a part of a panel of a motorcycle formed to cover the
enclosure.
[0008]
According to the first to third features, the water that has entered the enclosure is discharged to
the outside from the resonance duct provided to enhance the acoustic effect. In particular,
according to the second feature, water falling from above, such as rain, does not easily enter the
enclosure. Further, according to the third feature, in the speaker box integrally formed on the
panel of the two-wheeled motor vehicle, it is possible to prevent the entry of water into the inside
of the enclosure, and it is also possible to drain water.
[0009]
Further, according to the present invention, in a bass reflex / speaker device mounted on a
motorcycle having a front cowl, the enclosure installed in a space covered by the front cowl and
accommodating the speaker to form an acoustic space; And a resonant duct provided on the front
side of the speaker at a lowermost end of the enclosure, the resonant duct having an opening
whose directivity direction is set in a range from the front horizontal direction to the vertical
lower side of the speaker There is a fourth feature in the point being done.
[0010]
Further, according to the present invention, there is provided an air scoop having an outside air
intake provided in front of a vehicle and an air outlet for discharging the taken outside air to the
rider side, and a louver disposed opposite to the air outlet of the air scoop. And a fifth feature in
that the resonant duct is directed downward and opened.
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[0011]
According to the fourth and fifth features, when the inside of the cowl becomes negative pressure
due to traveling wind, the inside of the enclosure also becomes negative pressure through the
resonance duct, so that the diaphragm of the speaker device installed inside the cowl is back and
forth There is no difference in air pressure.
[0012]
Further, according to the fifth feature, since the resonance duct is directed downward and hidden
behind the louver, it does not require a space for arranging the resonance duct on the panel of
the motorcycle, and the appearance is complicated. It can be avoided, and it is also possible to
work through a louver at the time of maintenance.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described
below with reference to the drawings.
FIG. 3 is a perspective view showing the appearance of a motorcycle incorporating the bass
reflex / speaker device according to the embodiment of the present invention.
In the figure, a radio antenna 2 and a CB receiving antenna 3 are installed at the rear of the
motorcycle 1.
Also, an audio unit 5 is installed in front of the seat 4.
A panel at the center of the front of the motorcycle 1 is provided with a speedometer, a
tachometer, and a liquid crystal display device 6 for performing other displays, and on the left
and right thereof a pair of speaker systems 7, 8 are provided respectively. . Signals received by
the antennas 2 and 3 and sound data read from a cassette tape or the like are adjusted by the
audio unit 5 and sounded from the speaker systems 7 and 8.
[0014]
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Subsequently, the speaker systems 7 and 8 will be described in detail. Since the speaker systems
7 and 8 are configured similarly to each other, in the following description, the speaker system 7
will be representatively described. FIG. 1 is an external perspective view of a speaker 7 mounted
on a motorcycle, and FIG. 2 is a longitudinal sectional view of the speaker system 7. In both
figures, the loudspeaker system 7 is covered by a loudspeaker box 9 in which an acoustic space
enclosed by an enclosure 10 is formed. The speaker box 9 is formed of a part of a panel covering
the motorcycle. A speaker 11 is attached to the upper front inner surface of the enclosure 10,
and a hole is formed in the enclosure 10 and the speaker box 9 so as to conform to the front
shape of the speaker 11, and a net 12 is formed in the hole of the speaker box 9. Is covered.
[0015]
The enclosure 10 is formed with a resonance duct or bass reflex duct 15 extending outward from
the intersection of its bottom surface 13 and front surface 14. The side from which the sound is
mainly emitted from the speaker system is the front, and the back direction of the speaker
system is the back, and the speaker box 9 is the back of its front surface, that is, the lower part of
the surface where the net 12 is stretched. The bass reflex duct 15 having a surface (recessed
surface) 9A inclined toward the front and extending forward from the bottom surface 13 of the
enclosure 10 protrudes outward from the surface 9A.
[0016]
As can be understood from FIGS. 1 and 2, the bass reflex duct 15 formed in the enclosure 10 is
formed to be inclined downward to the receding surface 9A, so that it is difficult for water falling
from above to enter. Moreover, since the bass reflex duct 15 is provided at the bottom surface 13
of the enclosure 10, that is, the lowermost portion, even if water intrudes, the water is
immediately discharged from the bass reflex duct 15. Therefore, water does not accumulate at
the bottom of the enclosure 10.
[0017]
In the present embodiment, the bass reflex duct 15 is projected to the retreating surface 9A.
However, the bass reflex duct 15 does not necessarily protrude from such a retreating surface
9A, and may be projected to the vertical surface of the enclosure 10, that is, the front surface.
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Good. Further, from the viewpoint of preventing the entry of water, the duct 15 is preferably
inclined downward, but the lower inner surface of the bass reflex duct 15 may be located at the
same horizontal level as at least the bottom surface 13.
[0018]
FIG. 4 is a front view of an essential part of a motorcycle equipped with a speaker system
according to a second embodiment of the present invention, showing the left half of the
motorcycle. In FIG. 4, the front of the vehicle is covered by a front cowl 16 and a windshield
shield 17 mounted on top of it. The front cowl 16 accommodates headlights 19 and 20 whose
front surface is covered with the lens surface 18. At a position adjacent to the headlight 20, an
introduction duct (air scoop) 21 for taking in the outside air to the rider side is provided, and this
air scoop 21 opens in front of the front cowl 16 near the end of the lens surface 18 doing. A
meter box 22 is provided above the headlights 19, and a speaker system enclosure 23 is
provided above the headlights 20.
[0019]
FIG. 5 is a front view of an essential part of the motorcycle with the front cowl removed. In the
figure, a stay 25 and a stay 26 which are substantially horizontally extended are fixed to a
support post 24 attached to a steering head (not shown). The air scoop 21 is suspended at the
end of the stay 25. A meter box 22 is supported by the stay 26, and the meter box 22 is coupled
to the stay 25 at its lower part. An enclosure 23 of the speaker system is disposed between the
stay 25 and the stay 26, and the enclosure 23 can be fixed to the stay 25 and the stay 26 by an
appropriate means.
[0020]
6 is a rear view of FIG. 5, that is, a front view of an essential part of the speaker system, and FIG.
7 is a side sectional view of the same. In both figures, a panel 28 is disposed on the front of the
speaker 27 to protect the speaker 27 and to form an aesthetic appearance. The panel 28 is made
of a resin or metal plate having a large number of holes, and can be integrally formed with a
panel (instrument panel) disposed on the front of the meter box 22.
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[0021]
A second panel 29 connected to the lower part of the panel 28 is provided, and the second panel
29 is provided with a louver 30 adapted to the air outlet 21A of the air scoop 21. A bass reflex
duct 23A is formed at the bottom of the enclosure 23. The bass reflex duct 23A protrudes
downward from the enclosure 23 and is open between the air outlet 21A of the air scoop 21 and
the louver 30.
[0022]
By forming the bass reflex duct 23 downward from the bottom surface of the enclosure 23, it is
possible not only to prevent water from being accumulated in the enclosure 23, but also
sufficient on the instrument panel, similar to the bass reflex duct 15 described with reference to
FIG. Even when space can not be secured, good sound effects can be obtained by the bass reflex
duct. Even when the bass reflex duct 23 is directed downward as described above, the sound
emitted from the bass reflex duct 23 does not adversely affect the transmission of the sound to
the rider side because it is a low-pitched sound region with low directivity. Further, since the bass
reflex duct 23 is installed in the vicinity of the exhaust port 21A, the bass is easily transmitted to
the rider side.
[0023]
Furthermore, since the bass reflex duct 23 is opened inside the cowl, it is possible to eliminate
the air pressure difference between the front and back of the diaphragm of the speaker 27 by the
traveling wind, and to prevent the deterioration of the sound quality. .
[0024]
Although the above-described embodiment shows an example in which the bass reflex duct is
opened forward and downward or vertically downward, the present invention is not limited to
this embodiment, and the opening direction of the bass reflex duct may be variously modified.
The point is that the sound is easy to be transmitted to the rider side and water is difficult to
enter, and it is located at the lowermost end of the enclosure and is opened near the front of the
speaker so that the water once entered is easily discharged. The pointing direction may be set in
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the range from the lower to the vertical.
[0025]
As is apparent from the above description, according to the inventions of claims 1 to 5, water
falling on the speaker box does not easily enter the enclosure, and water once infiltrated easily
from the duct. Exhausted. Therefore, the bass reflex / speaker device can be mounted on a device
that may be used in a state of being exposed to rain, such as a motorcycle, and the bass reflex
effect of the bass reflex and sharpening in the middle and high tone range You can enjoy some
music.
[0026]
Also, when mounted inside the cowl of a motorcycle, good sound quality can be maintained
without being affected by negative pressure caused by traveling wind.
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