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JP2001016673

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2001016673
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device and a sound reproducing method, and more particularly, to a speaker excellent in
the reproduction capability of a bass audio signal and a sound reproducing method.
[0002]
2. Description of the Related Art As a speaker for improving the reproduction rate of a low-range
audio signal, a speaker of a bass reflex (bass reflex) system, a Kelton system or the like is known.
[0003]
As shown in FIG. 4A, the bass reflex type speaker comprises a loudspeaker unit 70 disposed in
the cabinet 60, and a bass reflex port 80 for communicating the interior of the cabinet 60 with
the external space.
The bass reflex port 80 resonates with the bass-range reproduction sound generated in the
cabinet 60, and emits the bass-range reproduction sound from the opening.
[0004]
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The bass reflex type loudspeaker as shown in FIG. 4A can improve the reproduction ratio of the
bass region as compared with a closed loudspeaker without a bass reflex port. However, its bass
reproduction ability was inadequate.
[0005]
On the other hand, as shown in FIG. 4 (b), the Kelton type speaker comprises a plurality of
cavities (sealed chambers) in the cabinet 61 by the sub-baffle 62, and speaker units 71 and 72
are provided for each of the cavities. It has the following structure.
[0006]
The Kelton speaker has an improved ability to reproduce the bass region compared to the bass
reflex speaker, but the ability to reproduce the bass sound is insufficient.
[0007]
Therefore, a speaker system for bass in which bass reflex ports are arranged in respective
cavities formed in a cabinet of a speaker of Kelton system is disclosed in Utility Model
Registration No. 2553877 as a speaker for enhancing bass reproduction. It is done.
[0008]
In the speaker system according to the present invention, as shown in FIG. 4C, the first bass
reflex port 81 provided in the rear cavity of the first speaker unit 73 and the rear cavity of the
second speaker unit 74. The second bass reflex port 82 provided on the front side of the cabinet
63 is connected to the external space.
[0009]
SUMMARY OF THE INVENTION In the bass loudspeaker system disclosed in Utility Model
Registration No. 2553877, the openings of the bass reflex ports 81 and 82 are disposed on the
front of the cabinet.
For this reason, when the volume of the cabinet 63 is small etc., the length of the bass reflex
ports 81 and 82 can not be secured sufficiently, and the reproduction capability of the bass
range may be insufficient.
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[0010]
Further, since the openings of all the bass reflex ports 81 and 82 are disposed on the front of the
cabinet 63, the spread of the low-range reproduction sound is interrupted when there is an
obstacle or the like in front of the cabinet.
As a result, sufficient low-frequency reproduction capability can not be obtained.
For example, when this speaker is installed in a trunk of a vehicle interior of a car, depending on
the installation location, the front baffle may be blocked, and all the sound outlets may receive a
large load, making it difficult to produce sound.
[0011]
The present invention has been made in view of the above-described circumstances, and it is an
object of the present invention to provide a speaker device excellent in bass band reproduction
capability and a sound reproduction method.
[0012]
SUMMARY OF THE INVENTION In order to achieve the above object, a speaker device according
to a first aspect of the present invention includes a cabinet having an opening on the front, and
an opening, the inside of the cabinet And a speaker unit disposed in series at the opening of the
cabinet and the opening of the partition, and the cabinet is disposed in each of the cavities. And
at least two bass reflex ports which communicate the cavity and the external space, are opened in
different directions from each other, and radiate the reproduced sound of the low frequency
range to the outside.
[0013]
According to this configuration, the opening direction of the bass reflex port can be set arbitrarily
without being limited to the front side.
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This makes it possible to design a bass reflex port as long as possible for the size of the cavity,
and achieve high bass reproduction capability even with a relatively small cabinet speaker.
[0014]
Further, since the bass reflex ports are opened in different directions, the spread of the low
frequency reproduction sound is not blocked even if there is an obstacle.
Note that it is not necessary for all the bass reflex ports to open in different directions.
It is sufficient that at least two bass reflex ports are opened in directions different from each
other.
[0015]
[0015] In order to achieve the above object, according to a second aspect of the present
invention, there is provided an acoustic reproducing method comprising: providing a plurality of
cavities; and a bass reflex port disposed in communication with the cavities and the external
space. The reproduction method is characterized in that the bass reproduction sound is enhanced
in each of the cavities, and the reinforced bass reproduction sound is emitted through the bass
reflex port in different directions in the external space.
[0016]
According to such a configuration, since the low range reproduction sound can be emitted in an
arbitrary direction, good low range reproduction can be realized regardless of the installation
position (direction) of the speaker.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described with reference to the drawings.
[0018]
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FIG. 1 (a) is a sectional view of a loudspeaker according to an embodiment of the present
invention, and FIG. 1 (b) is a perspective view thereof.
As shown in FIGS. 1A and 1B, the speaker (speaker device) 1 includes a cabinet 10, a front baffle
11, a sub baffle 12, a first speaker unit 31, and a second speaker unit 32. And a first bass reflex
port 51 and a second bass reflex port 52.
[0019]
The interior of the cabinet 10 is divided by a sub-baffle 12 and divided into two chambers, a
front chamber forming a first cavity 21 and a rear chamber forming a second cavity 22.
[0020]
In the front baffle 11 of the cabinet 10, the first speaker unit 31 is disposed so that the
diaphragm surface is directed to the outside, and in the sub baffle 12, the diaphragm surface is
directed to the first cavity. Two speaker units 32 are disposed.
That is, the first speaker unit 31 and the second speaker unit 32 are arranged in series (tandem)
in the front-rear direction.
[0021]
The second bass reflex port 52 is disposed in the second cavity 22 and connects the second
cavity 22 to the external space through the second opening 42 formed on the side surface of the
cabinet 10.
The length of the second bass reflex port 52 is set to a sufficient length because the length of the
second bass reflex port 52 and the resonance due to the second cavity 22 determine the basic
reproduction band of the speaker device. .
[0022]
The first bass reflex port 51 is disposed in the first cavity 21 and connects the first cavity 21 to
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5
the external space through the first opening 41 formed in the top surface of the cabinet 10.
[0023]
The internal sound pressure of the first cavity 21 is lower than the internal sound pressure of the
second cavity 22 due to the series arrangement of the speaker units.
For this reason, the level of the sound pressure from the first bass reflex port 51 is slightly
smaller than the level of the sound pressure from the second bass reflex port 52.
Therefore, the resonance frequency of the first bass reflex port 51 is slightly higher than the
resonance frequency of the second bass reflex port 52 in order to widen the bass reproduction
band width as the speaker device without any middle bending. Thus, the length of the first bass
reflex port 51 is set.
[0024]
According to this configuration, the first bass reflex port 51 and the second bass reflex port 52
are opened in different directions (upward and lateral directions) from each other, and from the
bass reflex ports 51 and 52 Low-range playback sounds are emitted in different directions.
Therefore, even if there is an obstacle on a part of the front or side of the speaker 1, the spread
of the low frequency reproduction sound is not blocked, and the low frequency reproduction
sound is obtained regardless of the installation position (direction) of the speaker 1. Appropriate
acoustic characteristics can be obtained.
[0025]
Further, even when the depth of the speaker 1 is small and the lengths of the cavities 21 and 22
are short, the lengths of the bass reflex ports 51 and 52 are secured at optimum values by
securing the height and width of the speaker. can do.
[0026]
The operation of the loudspeaker 1 according to the present embodiment will be described by
taking the case of being installed in a car as an example.
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[0027]
FIG. 2 is a view showing a case where the loudspeaker according to the present embodiment is
installed in a car, in which 100 indicates a car and 200 indicates a seat in the car.
[0028]
Here, it is assumed that the speaker 1 is installed at the rear of the seat 200 in the automobile
100 so that the front baffle 11 faces the seat 200.
[0029]
In this case, since the first speaker unit 31 is disposed facing the seat 200, the reproduction
sound emitted from the first speaker unit 31 is the backrest of the seat 200 as shown by the
arrow 1A in the figure. , And reflected by the backrest as shown by the arrow 1B, and spread
throughout the vehicle to reach the listening position.
[0030]
Further, since the second opening 42 is formed on the side surface (the front side in the figure)
of the cabinet 10, the sound radiated from the second bass reflex port 52 is in the car as shown
by the arrow 1C. It reflects on the side wall and spreads throughout the car to reach the listening
position.
[0031]
Further, the bass range reproduced sound from the first bass reflex port 51 formed on the top
surface of the cabinet 10 is radiated above the speaker 1.
The radiated reproduction sound diffracts the backrest of the seat 200 as indicated by the arrow
1D to reach the listening position as a substantially direct sound, and is reflected by the ceiling in
the vehicle as indicated by the arrow 1E to a substantially direct sound to the listening position
To reach.
[0032]
Further, by arranging the speaker 1 so that the opening (first opening 41) of the first bass reflex
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port 51 is directed to the listening position, the bass reproduction sound reaches the listening
position as almost direct sound. Therefore, the conduction efficiency of the reproduced sound is
improved, and efficient bass region reproduction can be realized.
[0033]
That is, since the respective bass reflex ports face in different directions, the installation position
(direction) of the speaker 1 is given freedom, and the installation is made such that the optimum
reproduction efficiency can be obtained according to the situation of the installation place. can
do.
As a result, optimal bass range reproduction can be realized regardless of the installation
location.
[0034]
In the above embodiment, the speakers in which the openings of the bass reflex port are
disposed on the top and side surfaces of the cabinet are shown, but the surface on which the
openings are disposed is arbitrary.
For example, one of the bass reflex ports may be opened at the front.
In this case, as shown in FIG. 3A, the opening 41 may be disposed at the center of the speaker
unit 301 disposed on the front, and the bass reflex port 51 may communicate with the external
space through the opening 41. .
As a result, even if the opening of the bass reflex port is disposed on the front, the area of the
front can be minimized, and downsizing of the cabinet and sufficient bass range reproduction can
be realized simultaneously.
[0035]
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In the above embodiment, a speaker having two cavities is shown, but a third cavity 23, a third
speaker unit 33, and a third opening as shown in FIG. 3 (b) It may be configured as three or more
rooms having a 43 and a third bass reflex port 53.
That is, the present invention can be applied to a cabinet having a cavity of n stages (n is a
natural number of 2 or more).
In this case, the number of cavities in which the speaker units are arranged is arbitrary, and the
number of speaker units arranged in each cavity is also arbitrary.
[0036]
Further, although the number of bass reflex ports configured in each cavity is one in the above
embodiment, a plurality of bass reflex ports may be disposed in one cavity. In this case, as shown
in FIG. 3C, a plurality of bass reflex ports 41A and 41B (42A and 42B) disposed in one cavity
may be disposed so that the radiation directions of reproduced sound are different from each
other, or As shown in FIG. 3 (d), a plurality of bass reflex ports 41A, 41B (42A, 42B)
corresponding to one cavity may be arranged to face in the same direction.
[0037]
In the loudspeaker according to the present invention, the bass reflex ports corresponding to the
respective cavities only have to be configured to emit the reproduced sound in different
directions. For example, the opening direction of each bass reflex port is arbitrarily set. The
configuration of the cabinet may be variable.
[0038]
As described above, according to the speaker of the present invention, it is possible to design a
bass reflex port so as to secure an optimum length according to the structure and size of each
cavity.
Further, since the bass band reproduction sound is emitted in the direction different from each
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other for each bass reflex port, the bass band reproduction is not disturbed by the installation
position (direction) of the speaker. Therefore, optimal bass range reproduction can be realized
regardless of the situation of the installation place and the installation position (direction) of the
speaker.
[0039]
Brief description of the drawings
[0040]
1 is a diagram showing the configuration of the speaker device according to the first
embodiment of the present invention, (a) is a cross-sectional view, (b) is a perspective view.
[0041]
2 is a diagram for explaining the acoustic characteristics when the speaker device according to
the first embodiment of the present invention is used in a car.
[0042]
3 is a view showing a modification of the embodiment of the present invention, (a) is a crosssectional view showing the configuration of the speaker apparatus having an opening portion
disposed at the center of the speaker unit, (b) is a three-chamber speaker (C) is a perspective
view showing the appearance of a speaker apparatus in which a plurality of bass reflex ports in
different directions are arranged in one cavity, and (d) is a bass reflex in a plurality of same
directions in one cavity. It is a perspective view which shows the external appearance of the
speaker apparatus by which the port is arrange | positioned.
[0043]
4 is a cross-sectional view showing the configuration of the conventional example of the speaker
device, (a) shows a speaker of the bass reflex system, (b), (c) shows a speaker of the Kelton
system.
[0044]
Explanation of sign
[0045]
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REFERENCE SIGNS LIST 1 speaker device 10 cabinet 11 front baffle 12 sub baffles 21, 22, 23
cavities 31, 32, 33, 301 speaker units 41, 41 A, 41 B first opening 42, 42 A, 42 B second
opening 43 third Opening 51 First bass reflex port 52 Second bass reflex port 53 Third bass
reflex port 100 Automobile 200 seats
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