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JPH08149587

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DESCRIPTION JPH08149587
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus which is mainly used as a vehicle among various audio equipments and
constructed by attaching a grill for protecting the speaker to the front of the speaker unit.
[0002]
2. Description of the Related Art A conventional speaker apparatus of this type will be described
with reference to the drawings.
[0003]
7 (a) and 7 (b) are a front view and a side sectional view showing a conventional speaker device,
in which 9 is a resin integrally formed grille coupled to the front of the speaker 10. Has an
average thickness of 2.5 mm, and the through holes 9a of 5.5 mm square are continuously
opened in a lattice shape through ribs of 2.5 mm.
[0004]
Moreover, as for the attachment state of this speaker apparatus, as shown in FIG. 8, the grill 12 is
attached to the front of the speaker 10 (not shown) attached so as to be embedded in the door
11 of the vehicle. The position was attached and used at an angle of about 60 ° with respect to
the listening point 13.
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1
[0005]
However, the above-described conventional configuration has the following problems, and it has
been difficult to satisfactorily transmit the acoustic characteristics emitted from the speaker 10.
[0006]
That is, when the grille 9 mounted on the front surface of the speaker 10 is made of resin, it has
a certain thickness (t 2.5 to t 3.5 mm in consideration of moldability), and there is a through hole
such as a square hole or a round hole The attachment position of the grille 9 is an attachment
position at an angle with respect to the listener's listening point 13 of the listener, and the
attachment position of the grille 9 is in the front-rear direction with respect to the attachment
surface of the speaker 10. If the axis is 0 °, it will be heard at a position having an angle of
about 60 ° from the axis.
[0007]
Therefore, even if the grille 9 is not attached to the grille 9 and the grille 9 is attached to the
above, the thickness ratio of the grille 9 is As a shielding part, it obstructs the opening of the
grille 9 and becomes almost non-aperture, and the pattern of the sound pressure level and
frequency characteristic of the high region characteristic radiated from the speaker 10 and the
frequency characteristic pattern of the middle region are extremely It was to deteriorate.
[0008]
FIG. 9 shows the sound pressure frequency characteristics at 0 ° and 60 ° measured with the
conventional grill 9 mounted on the front, and FIG. 10 shows the so-called speaker device
measured without the grill 9, so-called Sound pressure frequency characteristics at 0 ° and 60
° of the speaker 10 alone, and it can be confirmed that the deterioration of the acoustic
characteristics by the grille 9 is remarkable as apparent from the summary of the sound pressure
frequency characteristics of the both (Table 1) It is.
[0009]
SUMMARY OF THE INVENTION In order to solve this problem, the speaker device according to
the present invention has a plurality of the speaker devices according to the present invention,
which are arranged with a predetermined angle such that the axis in the long side direction faces
the listening point. The grille is provided with a rectangular through hole on the front, and the
speaker is mounted on the front.
[0010]
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2
[Function] With this configuration, the axis of the long side direction of the plurality of
rectangular through holes faces the listening point in the attached state, so the opening area as
viewed from the listening point is increased and the shielding is reduced. It is possible to transmit
to the listening point without deteriorating the acoustic characteristic emitted from the to
improve the sound pressure level in the high region and the dip in the middle region, and
eliminate the disturbance of the frequency characteristic.
[0011]
Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with
reference to the drawings.
[0012]
1 (a) and 1 (b) are a front view and a side sectional view showing the speaker device according to
the same embodiment, in which 1 is a grill integrally formed of resin, and 1a is a plurality of
grills 1 The rectangular through-hole 1b is a transverse rib provided in each of the through-holes
1a, and 2 is a speaker in which the grill 1 is coupled to the front, and a plurality of rectangular
through-holes provided in the grill 1 1a is provided with an angle of about 60.degree. With
respect to the listening point 13 indicated by reference numeral 13 in FIG. 8 for explaining the
above-mentioned actual vehicle attachment state, and this angle is set to the long side direction
of the rectangular through hole 1a in FIG. With the configuration angle, the grille aperture ratio
viewed from the listening point 13 can be improved from 0% to 40% of the conventional speaker
apparatus shown in FIG.
[0013]
In the present embodiment, the dimensions of the rectangular through holes 1a are 37 mm in the
long side direction and 7 mm in the short side direction, the rib thickness between the through
holes 1a is 3 mm, and the horizontal rib 1b including the acoustic reflection plate is It is
configured to have an angle of 45 ° with the direction of the listener.
[0014]
With such a configuration, it is possible to minimize degradation of the sound emitted from the
speaker 2 by the grille 1 and to reproduce an honest and natural sound, and the speaker
according to the present embodiment The sound pressure frequency characteristics at 0 ° and
60 ° of the device are shown in FIG. 2, and the results of comparison with the conventional
products are shown in (Table 2). Is recognized.
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[0015]
FIGS. 3 (a) and 3 (b) show a structure in which the horizontal ribs 1b shown in FIGS. 1 (a) and 1
(b) are perpendicular to each other. If the height 3b is 5 mm or less, the effect similar to that of
the horizontal rib 1b in FIG. 1 can be obtained, and the molding die can be easily processed when
molding the grill 3 with resin. is there.
[0016]
(Embodiment 2) The second embodiment of the present invention will be described below with
reference to the drawings.
[0017]
4 (a) and 4 (b) are a front view and a side cross-sectional view showing the speaker device
according to the embodiment, in which 4 is a grille, and 4a is a plurality of penetrating
rectangular shapes provided in the grille 4. A hole 4b is a reflector formed by providing a
predetermined angle so that the inner wall in the direction of the long side of the through hole
4a faces a listening point, and a speaker 2 has the grill 4 connected to the front. A plurality of
rectangular through holes 4a are provided at an angle of about 60 ° with respect to the
listening point 13 shown by reference numeral 13 in FIG. The reflection angle is set to be a
predetermined angle of about 30 ° such that the inner wall in the long side direction of the
through hole 4 a is directed to the listening point 13. It is considered as a reinforcing rib having a
plate 4b.
[0018]
The sound emitted from the speaker 2 strikes the reflection plate 4b by the reflection plate 4b,
the reflection angle also becomes 30 ° with respect to the incident angle of 30 °, and the
reflected sound is emitted in the direction of 60 ° with respect to the grill attachment surface As
a result, the disturbance of the frequency characteristics in the high and middle ranges is
reduced, which is directed to the direction of the listening point 13, and a speaker device that
reproduces excellent sound quality can be realized.
[0019]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to the drawings.
[0020]
5 (a) and 5 (b) are a front view and a side sectional view showing the speaker device according to
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the embodiment, in which 5 is a grille, and 5a and 5b are a plurality of rectangular shapes
provided on the grille 5 The through hole 5c is a transverse rib, 5d is a reflector, and 2 is a
speaker in which the grill 5 is coupled to the front.
[0021]
In the speaker apparatus of the present embodiment thus configured, the configuration of the
grille 1 of the first embodiment is the upper half of the grill 5 and the configuration of the grille
4 of the second embodiment is below the grill 5 It is configured to be combined in half.
[0022]
The speaker device according to the present embodiment is also rectangular in shape with an
angle of about 60 ° with respect to the listening point 13 indicated by reference numeral 13 in
FIG. The opening ratio of the upper half of the grill 5 seen from the listening point 13 is provided
by providing the through holes 5a and 5b and setting this angle as the configuration angle in the
long side direction of the rectangular through hole 5a in FIG. Can be improved from 0% to 40%
of the conventional speaker apparatus shown in FIG.
Further, the lower half of the grille 5 is a component angle in the direction of the short side of
the rectangular through hole 5b, and the inner wall 5 of the through hole 5b is at a
predetermined angle of about 30 ° so as to face the listening point 13. It is considered as a
reinforcing rib having the acoustic reflection plate 5d.
The sound radiated from the speaker 2 by the reflector 5d strikes the reflector 5d, the reflection
angle also becomes 30 ° with respect to the incident angle of 30 °, and the reflected sound is
emitted in the direction of 60 ° with respect to the grill attachment surface This configuration
makes it possible to minimize the deterioration of the sound emitted from the speaker 2 by the
grill 5 by this configuration, and to reproduce a straightforward and natural sound, and further
to increase the high frequency and The disturbance of the frequency characteristic in the middle
range is reduced, and a speaker device that reproduces excellent sound quality can be realized.
[0023]
FIG. 6 shows the sound pressure frequency characteristics at 0 ° and 60 ° of the speaker
device according to this example, and the result of comparing this with the conventional product
is shown in (Table 3). It is recognized that
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[0024]
Although this embodiment has been described as a speaker device for a car door, it is for rear
trays and instrument panels by controlling the angle, shape and size of the grill opening and the
angle of the reflector. It is well known that it is possible to cope with any mounting conditions
such as for roofs, and that the larger the through hole size of the rectangular shape, the longer
the size of the reflector plate, the better. It is needless to say that it is desirable to determine the
optimum dimensions in consideration of the grille strength in consideration of protecting the
speaker which is the function of.
[0025]
As described above, the speaker device according to the present invention can provide a speaker
device with excellent acoustic performance by controlling the shape of the grille opening
mounted on the front of the speaker. An effect as described can be obtained.
[0026]
1. Make the shape of the grill opening rectangular, and by directing the long side direction to the
listening point, prevent the sound pressure level reduction in the high region, prevent the
disturbance of the frequency characteristic pattern in the middle region, and more natural sound
performance It can be secured.
[0027]
2. Make the shape of the grille opening rectangular and direct the short side direction to the
listening point, and make the inner wall of the opening hole have a predetermined angle to
reflect the sound to the listening point It is possible to prevent the disturbance of the middle
frequency characteristic pattern and to improve the sound pressure level of the high region.
[0028]
3. By the configuration of the grille combining the above 1 and 2, together with the improvement
of the sound pressure level of the high region, the disturbance of the frequency characteristic
pattern of the mid region is prevented, and the speaker device more natural and less in the
acoustic performance deterioration Can be provided.
[0029]
Brief description of the drawings
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[0030]
FIG. 1A is a front view showing a speaker apparatus according to a first embodiment of the
present invention
[0031]
Fig. 2 Frequency characteristics of the loudspeaker system according to the same embodiment
[0032]
FIG. 3A is a front view showing an application example of the speaker apparatus according to the
first embodiment of the present invention
[0033]
FIG. 4A is a front view showing a speaker apparatus according to a second embodiment of the
present invention
[0034]
FIG. 5 (a) is a front view showing a speaker device according to a third embodiment of the
present invention
[0035]
FIG. 6 frequency characteristic diagram of the speaker device according to the third embodiment
[0036]
Fig.7 (a) Front view which shows the conventional speaker apparatus
[0037]
Fig. 8 A perspective view showing the attached state of the speaker device
[0038]
Fig. 9 Frequency characteristics of the conventional loudspeaker system
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[0039]
Fig. 10 Frequency characteristics of a conventional single speaker
[0040]
Explanation of sign
[0041]
1, 3, 4, 5 grills 1a, 3a, 4a, 5a, 5b through holes 1b, 3b, 5c lateral ribs 2 speakers 4b, 5d reflectors
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