JP2006173989

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DESCRIPTION JP2006173989
To provide a speaker device which can prevent wall reflection and can be easily installed. A front
end of a baffle plate (12, 14) joined at a rear portion at an angle of approximately 90 ° in an
upright state is provided with a camber (22, 24) which is curved outward from the front portion.
The speaker 16 is mounted on the baffle plates 12 and 14 so as to emit sound forward from the
speaker holes provided in the joint portions 12 and 14. Back plates 18 and 20 spaced
substantially parallel rearward from baffle plates 12 and 14 are connected at the rear at an angle
of approximately 90 ° in an upright state, and are connected to the front of back plates 18 and
20. Connects the baffle plates 12 and 14 via the warps 22 and 24, respectively. A cover plate is
provided for closing the openings of the upper and lower portions of the cylindrical body formed
of the baffle plates 12 and 14, the baffle plate joint portion, the back plates 18 and 20, and the
warp portions 22 and 24, respectively. It will be arranged in the enclosed space. [Selected figure]
Figure 1
Speaker device
[0001]
The present invention relates to a speaker device suitable for use by being disposed at a corner
of a room.
[0002]
Conventionally, as a speaker device, as shown in FIG. 14, a speaker device in which a speaker 2 is
housed in a closed cabinet 3 is widely used.
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Further, as a speaker device in which the influence of sound reflection from the ceiling or floor of
a room is reduced, a line array type speaker device in which a plurality of speakers are arranged
in the vertical direction to arrange line sound sources is known (for example, non-patent
documents 1). Stage Sound Journal 2001, 8, pp. 4-10
[0003]
When the speaker device 1 is disposed in the vicinity of the walls 4 and 5 in the room as shown
in FIG. 14, the frequency characteristic at the listening point (or observation point) P is disturbed
by the sound reflection from the wall 4. The frequency at which the dip appears in the frequency
characteristic is expressed by the following equation (1).
[0004]
[0005]
Here, c is the velocity of sound (340 [m / sec]) and n is 0, 1, 2, 3.
a is the distance between the center of the speaker 2 and the reflection point of the wall 4, b is
the distance between the reflection point of the wall 4 and the listening point P, d is the distance
between the center of the speaker and the listening point P is there. (A + b−d) is a path length
difference [m], and dips appear at frequencies at which this distance is a half wavelength and
frequencies that are odd multiples thereof. The frequency characteristic at this time is the same
as that of a so-called comb filter, and is generally expressed as shown in FIG. In FIG. 15, f1
represents a frequency at which the path length difference is a half wavelength, and f3, f5, f7,...
Represent frequencies of odd multiples of f1.
[0006]
Sound reflection from the wall 5 also disturbs the frequency characteristics in the same manner
as described above for the wall 4. The frequency at which the dip appears in the frequency
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characteristic is expressed by the following equation 2.
[0007]
[0008]
ここで、mは0,1,2,3…である。
a 'is the distance between the center of the loudspeaker 2 and the reflection point of the wall 5;
b' is the distance between the reflection point of the wall 5 and the listening point P; The
frequency characteristic at this time is approximately expressed as shown in FIG. In FIG. 16, f1
'represents a frequency at which the path length difference (a' + b'-d) is a half wavelength, and f3
', f5', f7 '... Represent frequencies of odd multiples of f1'.
[0009]
The frequency characteristics based on the sound reflection of the walls 4 and 5 on the two
surfaces are the result of combining the frequency characteristics in FIGS. If the frequency
characteristic at the listening point P is disturbed as shown in FIG. 17, even if the frequency
characteristic of the speaker 2 is flattened, it becomes meaningless. In other words, if a speaker
that is not affected by the sound reflection of the wall can be realized, the frequency
characteristic at the listening point P becomes a frequency characteristic with good flatness
inherent to the speaker, and a faithful reproduced sound may be obtained.
[0010]
The effect of the sound reflection from the wall as described above is as shown in FIG. 18 when
the speaker devices 1A and 1B similar to the speaker device 1 are arranged at the mirror image
position when the walls 4 and 5 are regarded as mirrors respectively In the above, it can also be
understood as a situation where the sound from the speaker device 1 interferes with the sound
from the speaker devices 1A and 1B. One mirror image speaker produces another mirror image
by another mirror, but is omitted here for the sake of simplicity.
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[0011]
FIG. 19 shows an example in which the speaker device 1 is embedded at a ridge line position
(corner) where the walls 4 and 5 intersect. In this way, when the speaker device is embedded in
the corner of the room, no sound incident on the wall exists, or a mirror image overlaps the
speaker itself, so that no sound is reflected from the wall, and the above-mentioned listening
point There is no disturbance of the frequency characteristic of
[0012]
However, in the speaker arrangement example shown in FIG. 19, it is necessary to carry out
extensive work for installing the speakers in an existing room, and there is a problem that
installation is not easy either in terms of work or cost. It is an object of the present invention to
provide a novel speaker device that can prevent wall reflection and can be easily installed.
[0013]
A first speaker device according to the present invention is a first and a second baffle plate in
which the rear portions are connected so as to form an angle of approximately 90 ° in an
upright state, and the first and second baffle plates Are provided with first and second warps that
respectively bow from the front to the outside, and a speaker hole is provided in a joint that
couples the first and second baffle plates. A speaker mounted on the first and second baffle
plates so as to emit sound from the speaker hole to the 90 ° angle side of the first and second
baffle plates, the first and second First and second back plates spaced approximately parallel
rearwardly from the two baffle plates, respectively, the rears being coupled behind the speaker
so as to form an angle of approximately 90 ° in an upright state And at the front of the first and
second back plates One in which the first and second baffle plates are connected via the first and
second cambers, and the first and second baffle plates, the connecting portion, and the first and
second ones. First and second lid plates respectively closing the upper and lower openings of the
cylindrical body constituted by the second back plate and the first and second warped portions;
The speaker is disposed in a sealed space formed by the first and second cover plates.
[0014]
According to the first speaker device, the closed cabinet for housing the speaker is constituted by
the cylindrical body and the first and second cover plates.
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The first and second back plates are joined at an angle of 90 ° so that the back of the tube is at
right angles in cross-section.
Therefore, the first speaker device can be easily installed in the room by arranging the corner of
the rear of the cylindrical body (the rear of the cabinet) at the corner at a right angle of the room.
In such an installation state, the sound emitted from the speaker is guided along the left and right
walls of the room on the 90 ° angle side of the first and second baffle plates. Therefore, sound
reflection from the wall does not occur, and at the listening point, the original frequency
characteristics of the speaker can be obtained.
[0015]
A second speaker device according to the present invention is a first and a second baffle plate in
which the rear portions are connected so as to form an angle of approximately 90 ° in an
upright state, and the first and second baffle plates Are provided with first and second warps that
respectively bow from the front to the outside, and a speaker hole is provided in a joint that
couples the first and second baffle plates. A speaker mounted on the first and second baffle
plates so as to emit sound from the speaker hole to the 90 ° angle side of the first and second
baffle plates, the first and second First and second back plates spaced approximately parallel
rearwardly from the two baffle plates, respectively, the rears being coupled behind the speaker
so as to form an angle of approximately 90 ° in an upright state And at the front of the first and
second back plates One in which the first and second baffle plates are connected via the first and
second cambers, and the first and second baffle plates, the connecting portion, and the first and
second ones. The upper portion of the cylindrical body and the opening of one of the upper and
lower portions of the cylindrical body constituted by the back plate of the second and the first
and second warped portions closed with the ceiling or floor of the room A lid plate for closing the
other opening of the lower portion is provided, and the speaker is disposed in a sealed space
formed by the cylindrical body, the ceiling or floor of the room, and the lid plate.
[0016]
According to the second speaker device, since one of the upper and lower openings of the
cylindrical body is closed by the ceiling or floor of the room, a cover plate for closing the one
opening becomes unnecessary, and the ceiling Or effective use of the floor becomes possible.
For this reason, when using a small-sized room (for example, a soundproof room for music
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practice) as the room, the second speaker device can be easily installed in the corner of the
ceiling or the floor. In such an installation state, wall surface reflection can be prevented as
described above for the first speaker device.
[0017]
A third speaker device according to the present invention is a first and a second baffle plate in
which the rear portions are joined to form an angle of approximately 90 ° in an upright state,
and the first and second baffle plates Are provided with first and second warps that respectively
bow from the front to the outside, and a speaker hole is provided in a joint that couples the first
and second baffle plates. A speaker mounted on the first and second baffle plates so as to emit
sound from the speaker hole to the 90 ° angle side of the first and second baffle plates, the first
and second First and second back plates spaced substantially parallel rearwardly from the two
baffle plates, respectively, and the first and second back plates are respectively provided in front
of the first and second back plates. In which the first and second baffle plates are connected via a
warp of the When the first and second back plates are respectively arranged on first and second
walls constituting a corner of a room, and the speaker is disposed immediately before the corner,
the first and second baffle plates and The opening of one of the upper and lower portions of a
cylindrical body formed of the coupling portion, the first and second back plates, the first and
second warped portions, and the first and second walls And a cover plate for closing the other
opening of the upper and lower portions of the cylindrical body in a state of being closed by the
ceiling or floor of the room, the cylindrical body, the ceiling or floor of the room, and the cover
plate The speaker is disposed in a sealed space to be formed.
[0018]
According to the third speaker device, by arranging the first and second back plates respectively
on the first and second walls constituting the corner of the room and arranging the speakers
immediately before the corner Since the second baffle plate and its coupling portion, the first and
second back plates, the first and second warped portions, and the first and second walls
constitute a cylindrical body, the corner and In the vicinity thereof, the first and second walls
constitute a tubular body instead of the first and second back plates, and the size of the first and
second back plates can be reduced.
In addition, since one of the upper and lower openings of the cylindrical body is closed with the
ceiling or floor of the room, a cover plate for closing the one opening becomes unnecessary, and
effective use of the ceiling or floor is possible. become. Therefore, when using a small room as a
room as described above for the second speaker device, the third speaker device can be easily
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installed in the corner of the ceiling or the floor. In such an installation state, wall surface
reflection can be prevented as described above for the first speaker device.
[0019]
In any one of the first to third speaker devices, the first and second warped portions may be
respectively formed on the first and second sides of the first and second baffle plates at an angle
of 90 °. It is preferable that the surface of the second baffle plate has a continuously smooth
curved surface. In this way, it is possible to prevent the occurrence of slight irregularities in the
frequency characteristics at the listening point based on the diffraction of sound.
[0020]
A fourth speaker device according to the present invention is the first to third baffle plates each
having two sides orthogonal to each other, wherein the first and second baffle plates form an
angle of about 90 °. One of two orthogonal sides of the first baffle plate and one of two
orthogonal sides of the second baffle plate are combined, and the second and third baffle plates
have an angle of about 90 °. And one side of two orthogonal sides of the second baffle plate and
one side of two orthogonal sides of the third baffle plate are combined to form the first and third
baffles. The other side of the two orthogonal sides of the first baffle plate and the other side of
the two orthogonal sides of the third baffle plate are combined such that the plate forms an angle
of approximately 90 °. A front portion of each of the first to third baffle plates being curved
outward from the front portion; A third to third warped portion is provided, and a speaker hole is
provided in a corner portion formed by coupling of the first to third baffle plates, The first to
third baffles from the speaker hole The speakers mounted on the first to third baffle plates so as
to emit sound on the side of the plate at an angle of 90.degree. First and third back plates
arranged and having two sides orthogonal to each other, wherein the first and second back plates
are orthogonal to each other such that the first and second back plates form an angle of about 90
° One of the two sides and one of the two orthogonal sides of the second back plate are joined
behind the joint of the first and second baffle plates, and the second and third back surfaces are
combined. The other side of the two orthogonal sides of the second back plate and the first side
so that the plate makes an angle of about 90.degree. Such that one of the two orthogonal sides of
the back plate is joined behind the junction of the second and third baffle plates so that the first
and third back plates form an angle of approximately 90 ° And the other side of the two
orthogonal sides of the first backing plate and the other side of the two orthogonal sides of the
third backing plate are the coupling portions of the first and third baffle plates. And the first to
third baffle plates are connected to the front portions of the first to third back plates via the first
to third cambers, respectively. The speaker may be disposed in a sealed space formed by the first
to third baffle plates, the first to third back plates, and the first to third warped portions.
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[0021]
According to the fourth speaker device, the closed cabinet for housing the speaker is constituted
by the first to third baffle plates, the first to third back plates, and the first to third curved
portions.
Since the first to third back plates are coupled so as to form two 90 ° angles, the fourth speaker
device is provided at the back of the combined first to third back plates (at the back of the
cabinet) It can be easily installed in the room by arranging the corners at the corner where the
three ridges of the room intersect at right angles. In such an installation state, the sound radiated
from the speaker is guided along the two walls and the ceiling or floor of the room on the side
where the first to third baffle plates form an angle of 90 °. It will be. Thus, no sound reflections
from the walls and ceiling or floor occur, and at the listening point the natural frequency
characteristics of the loudspeaker are obtained.
[0022]
A fifth speaker device according to the present invention is the first to third baffle plates each
having two sides orthogonal to each other, and the first and second baffle plates have an angle of
approximately 90 °. One of two orthogonal sides of the first baffle plate and one of two
orthogonal sides of the second baffle plate are combined, and the second and third baffle plates
have an angle of about 90 °. And one side of two orthogonal sides of the second baffle plate and
one side of two orthogonal sides of the third baffle plate are combined to form the first and third
baffles. The other side of the two orthogonal sides of the first baffle plate and the other side of
the two orthogonal sides of the third baffle plate are combined such that the plate forms an angle
of approximately 90 °. A front portion of each of the first to third baffle plates being curved
outward from the front portion; A third to third warped portion is provided, and a speaker hole is
provided in a corner portion formed by coupling of the first to third baffle plates, and the first to
third baffles from the speaker hole Loudspeakers mounted on the first to third baffle plates so as
to emit sound on the side of the plate at an angle of 90 °, and separated substantially parallel to
the rear from the first to third baffle plates, respectively The first to third back plates are
disposed, and the first to third baffles are disposed on the front portions of the first to third back
plates via the first to third warped portions, respectively. First and second walls and a ceiling or
floor disposed on the speaker and immediately before the corner of the room where the three
ridges of the room meet at a right angle, The first and second back plates and the third back
plate respectively Is formed by the first and second baffle plates, the first to third back plates, the
first to third curved portions, the first and second walls, and the ceiling or floor in a state The
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speaker is disposed in an enclosed space.
[0023]
According to the fifth speaker device, the speaker is disposed immediately before the corner
where the three ridges of the room meet at a right angle with each other, and the first and
second walls constituting the corner and the ceiling or floor are provided. Since the first and
second back plates and the third back plate are arranged respectively, the first and second walls
and the ceiling or floor are first to third back plates in the corner and in the vicinity thereof.
Instead, the cabinet is configured to enable the size reduction of the first to third back plates and
to effectively use the ceiling or the floor.
For this reason, when using a small-sized room as a room similarly to the above-mentioned about
a 2nd speaker apparatus, a 5th speaker apparatus can be easily installed in the corner of a
ceiling or a floor. In such an installation state, sound reflection from a wall, a ceiling or a floor
can be prevented in the same manner as described above for the fourth speaker device.
[0024]
In the above-described fourth or fifth speaker device, the first to third curved portions
respectively form the 90 ° angle of the first to third baffle plates. Preferably, the surface of the
baffle plate has a curved surface which forms a smooth and continuous curved surface. In this
way, the disturbance of the frequency characteristic can be prevented at the listening point based
on the diffraction of sound.
[0025]
According to the present invention, it is possible to realize a speaker device which is not affected
by sound reflection from a wall, a ceiling or a floor when used by being arranged at a corner of a
room, and the speaker is flat at the listening point. There is an effect that frequency
characteristics can be obtained. In addition, the installation of the speaker device does not
require extensive construction, and has the effect of being easily installed.
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[0026]
FIG. 1 shows a cross section of a speaker device according to the present invention, and the
principle of the speaker device according to the present invention will be described with
reference to FIG.
[0027]
The speaker device 10 includes baffle plates 12 and 14, a speaker 16 and back plates 18 and 20.
The baffle plates 12 and 14 are connected at their rears so as to form an angle of approximately
90 °, and at the front of the baffle plates 12 and 14, there are warped portions 22 and 24 that
are curved outward from the front. It is provided. Loudspeaker holes are provided in the
connecting portion for connecting the baffle plates 12 and 14 so that the speaker 16 emits the
baffle plates 12 and 14 so as to emit sound from the speaker holes to the 90 ° angle side of the
baffle plates 12 and 14. It is attached to.
[0028]
The back plates 18 and 20 are spaced substantially parallel rearward from the baffle plates 12
and 14, respectively, and the rear portions are connected behind the speaker 16 so as to form an
angle of approximately 90 °. Baffle plates 12 and 14 are coupled to front portions of the back
plates 18 and 20 via the curved portions 22 and 24, respectively.
[0029]
A cylindrical body is constituted by the baffle plates 12 and 14 and the joint portion thereof, the
back plates 18 and 20, and the warped portions 22 and 24. The upper and lower openings of the
cylindrical body are denoted by reference numeral 32 in FIG. It is closed by upper and lower lid
plates as indicated by 34. As a result, the speaker 16 is disposed in a sealed space formed by the
cylindrical body and the upper and lower lid plates. That is, the speaker 16 is housed in a closed
cabinet constituted by a cylindrical body and upper and lower lid plates. Because the back plates
18, 20 are joined at an angle of 90 °, the back of the tube (the back of the cabinet) has a right
angle cross-section.
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[0030]
The speaker device 10 can be easily installed in a room by arranging the rear right corner of the
cylindrical body at the corner (the ridge line position) formed by the walls 26 and 28 of the room
at right angles. Can. In such an installation state, the sound emitted from the speaker 16 is
guided along the left and right walls 26, 28 of the room on the side of the baffle plates 12, 14 at
an angle of 90 °. Assuming that the width of the left and right wall surfaces formed by the baffle
plates 12 and 14 is W, at frequencies above W, the operation is the same as in the case where
the speakers are embedded in the corners as shown in FIG. There is no sound reflection from the
walls 26, 28. On the other hand, at frequencies lower than the frequency with W as the
wavelength, even if the driver unit of the speaker 16 is several centimeters away from the corner
formed by the walls 26, 28, or the baffles 12, 14 are several from the walls 26, 28 respectively.
Even if they are separated by cm, the shift is sufficiently short compared to the wavelength, so
the operation is the same as when the speakers are embedded in the corners as shown in FIG. 19,
and sound reflection from the left and right walls 26, 28 occurs. Absent. Therefore, at the
listening point, the original frequency characteristic of the speaker 16 is obtained. The width W
shown in FIG. 1 can be about 10 to 50 [cm], and the wider the width W, the more ideal the
frequency characteristics.
[0031]
FIG. 2 shows a speaker apparatus according to a first embodiment of the present invention,
wherein a front view of the speaker apparatus is shown in FIG. 3 and a sectional view taken along
the line AA 'of FIG. 3 is shown in FIG. An enlarged cross-sectional view of the speaker 4 and the
speaker mounting portion is shown in FIG. In FIGS. 2-5, the same code ¦ symbol is attached ¦
subjected to the part similar to FIG.
[0032]
The speaker device 10 includes baffle plates 12 and 14, speakers 16 (1) to 16 (N), back plates 18
and 20, and lid plates 32 and 34. The baffle plates 12 and 14 are connected at their rears by the
speaker mounting plate 30 so as to form an angle of approximately 90 ° in the upright state,
and the front sides of the baffle plates 12 and 14 are respectively from the front to the outside
Warpages 22 and 24 are provided. The cambers 22 and 24 have cambered surfaces that form
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smooth curved surfaces continuously with the surfaces of the baffle plates 12 and 14 on the side
of the baffle plates 12 and 14 that forms an angle of 90 °.
[0033]
A plurality of N speaker holes S <b> 1 to SN are formed in a line in the vertical direction in the
speaker mounting plate 30 that couples the baffle plates 12 and 14. The number N of the
speaker holes S1 to SN can be 16, for example. The speakers 16 (1) to 16 (N) are attached to the
speaker attachment plate 30 so as to emit sound from the speaker holes S1 to SN to the sides of
the baffle plates 12 and 14 that form an angle of 90 degrees. The speakers 16 (1) to 16 (N) are
connected between the positive and negative output terminals of an output amplifier (not shown)
so as to be in the same phase.
[0034]
The back plates 18 and 20 are disposed to be spaced substantially parallel rearward from the
baffle plates 12 and 14, respectively, and the speakers 16 (1) to 16 have their backs arranged at
an angle of approximately 90 ° in the upright state. Behind the column of (N) are joined. Baffle
plates 12 and 14 are coupled to front portions of the back plates 18 and 20 via the curved
portions 22 and 24, respectively.
[0035]
As shown in FIG. 4, the back plate 18 has a structure in which the back plate 18a and the back
plate 18b are joined at a joint portion J1, and the back plate 20 also includes the back plate 20a
and the front back plate 20b. And are joined at the joint portion J2. With such a configuration,
the assembly operation can be easily performed. That is, after preparing the baffle plates 12 and
14 coupled to the front back plates 18b and 20b via the warped portions 22 and 24,
respectively, the speaker mounting plate 30 to which the speakers 16 (1) to 16 (N) are attached
On the back of baffle plates 12 and 14. Thereafter, the rear back plates 18a and 20a, which are
connected to each other at the rear, are joined to the front back plates 18b and 20b by bonding
or the like at the joint portions J1 and J2, respectively. Each of the back plates 18 and 20 can
also be a plate without a joint.
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[0036]
The speakers 16 (1) to 16 (N) have the same configuration as one another, and are mounted on
the baffle plates 12 and 14 in the same manner. The speaker mounting structure of the speaker
16 (3) will be described with reference to FIG. 5 as a representative.
[0037]
The speaker 16 (3) is, for example, a movable coil type, and includes a frame 40, a plate 42, a
permanent magnet 43, a back plate 44, a center pole 45, a cone (diaphragm) 46, a movable coil
47 and the like. A movable coil 47 is disposed in an air gap between a plate 42 coupled to the
south pole of the permanent magnet 43 and a center pole 45 coupled to the north pole of the
permanent magnet via the back plate 44. The movable coil 47 is attached to the root of the cone
46, and the sound signal is converted into sound by vibrating the cone 46 according to the sound
signal supplied to the movable coil 47. At the center of the cone 46, a dust mask 48 is provided
to prevent dust from entering the air gap. The speaker 16 (3) is attached to the speaker
mounting plate 30 at the flange-like peripheral portion 41 of the frame 40. When mounting the
speaker 16 (3), mount the driver unit so that the sound source position of the driver unit is
located at the intersection of the extension lines (shown by broken lines in FIG. 5) from the left
and right wall surfaces configured by the baffle plates 12 and 14 Do.
[0038]
A cylindrical body is formed by the baffle plates 12 and 14, the back plates 18 and 20, the
warped portions 22 and 24, and the speaker mounting plate 30, and the upper and lower
openings of the cylindrical body respectively have upper and lower lids The plates 32, 34 are
closed so as not to leak sound. As a result, the speaker 16 is disposed in a sealed space formed
by the cylindrical body and the lid plates 32 and 34. The tubular body can be made by wood
processing or plastic molding or the like.
[0039]
According to the above-described embodiment, as shown in FIG. 2, in the speaker device 10, the
right-angled corner of the rear of the cylindrical body is located at the position (corner) of the
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ridge 27 where the room walls 26 and 28 intersect at right angles. Thus, it can be easily
installed, for example, on the floor 36 in a room. In such an installation state, sound reflection on
the walls 26, 28 does not occur according to the principle described above with reference to FIG.
1, and the original frequency characteristic of the speaker 16 can be obtained at the listening
point. Moreover, since the driver unit of the speaker is disposed on the corner of the corner, the
solid angle seen from the speaker is π, and the efficiency is four times as high as radiation in
free space, especially in the non-directional bass region. That is, it improves by 6 dB). For this
reason, there is an advantage that a small diameter speaker can be used as the speakers 16 (1) to
16 (N).
[0040]
In the above-described embodiment, when the warped portions 22 and 24 have a sharp warped
surface, slight unevenness in the frequency characteristics at the listening point occurs due to
the diffraction of sound. In the embodiment described above, since the warpages 22 and 24 have
a smooth curved surface, it is possible to prevent such disturbance of the frequency
characteristic.
[0041]
In the above embodiment, a large number of speakers 16 (1) to 16 (N) are arranged in the
vertical direction to form a line array, so that the emitted sound is not diffused vertically, and the
directivity to the front is enhanced. . Therefore, the sound incident on the ceiling or floor is very
low, and the interference from the reflected sound from the ceiling or floor is also low.
[0042]
However, since the suppression of directivity by the line array structure involves the generation
of side lobes, some reflected sound from the ceiling or floor is generated. In order to reduce the
side lobes, the level of the sound signal input to the speakers at both ends of the line array and in
the vicinity thereof may be lowered as it approaches both ends. As an example, when the
speakers 16 (1) to 16 (N) are arranged with N = 24 speakers at an interval of 7 cm for each
adjacent speaker, the speakers 16 (1) and 16 (N) at both ends are For the inner speakers 16 (2)
and 16 (N-1), respectively, the signal level is lowered by 3 dB, and for the speakers 16 (1) and 16
(N) at both ends, the signal level is lowered by 6 dB. By doing this, it is possible to reduce the side
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lobes and to further improve the frequency characteristics at the listening point.
[0043]
In the above embodiment, since the line array configuration is used, the number of individual
speakers may be the number divided by the square root of the number N. For example, in a space
where a woofer of usually 30 cm is required, the aperture of 30/2 = 15 cm can be obtained by
adopting the ridge line driving method as shown in FIGS. In the case of this line array, the
aperture of 15/4 = 3.75 cm is sufficient. This small diameter of individual speakers is not only
advantageous in terms of cost, but also makes the speaker device of the present invention ideal
by bringing the position of the driver unit of each speaker closer to the corner of a corner. It also
approaches the ridgeline drive.
[0044]
FIG. 6 shows a first modification of the above-described embodiment. The same parts as those in
FIGS. 2 to 5 are denoted by the same reference numerals and detailed description thereof will be
omitted. A cross section taken along the line B-B 'of FIG. 6 is shown in FIG.
[0045]
The feature of the first modification is that in the speaker device 10 of FIG. 2, the lower opening
of the cylindrical body is closed by the floor 36 of the room instead of the cover plate 34. In this
case, the rear back plates 18a and 20a indicated by broken lines in FIG. 7 are present as shown
in FIG. According to such a configuration, the cover plate 34 becomes unnecessary, and
furthermore, the same function and effect as the speaker device of FIG. 2 can be obtained.
[0046]
In the first modification, the rear back plates 18a and 20a shown by broken lines in FIG. 7 may
be omitted. In this case, the front back plates 18b and 20b are placed along the walls 26 and 28,
respectively, and the speakers 16 (1) to 16 (N) are disposed immediately before the corners
formed by the walls 26 and 28, respectively. The back plates 18b and 20b and the lower end of
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the cylindrical body are respectively coupled to the walls 26 and 28 and the floor 36 by means
such as adhesion so as to prevent sound leakage. According to such a configuration, the back
plates 18a and 20a and the cover plate 34 become unnecessary, and furthermore, the same
function and effect as the speaker device of FIG. 2 can be obtained.
[0047]
FIG. 8 shows a second modification of the embodiment shown in FIG. 2. The same parts as in
FIGS. The cross section taken along the line b-b 'of FIG. 8 is the same as the cross section shown
in FIG.
[0048]
The feature of the second modification is that, in the speaker device 10 of FIG. 2, the upper
opening of the cylindrical body is closed by the ceiling 38 of the room instead of the cover plate
32. In this case, the rear back plates 18a and 20a indicated by broken lines in FIG. 7 are present
as shown in FIG. According to such a configuration, the cover plate 32 is not necessary, and
furthermore, the same function and effect as the speaker device of FIG. 2 can be obtained.
[0049]
In the second modification, the rear back plates 18a and 20a shown by broken lines in FIG. 7
may be omitted. In this case, the front back plates 18b and 20b are placed along the walls 26 and
28, respectively, and the speakers 16 (1) to 16 (N) are disposed immediately before the corners
formed by the walls 26 and 28, respectively. The back plates 18b and 20b and the upper end of
the cylindrical body are respectively coupled to the walls 26 and 28 and the ceiling 38 by means
such as bonding so as to prevent sound leakage. According to such a configuration, the back
plates 18a and 20a and the cover plate 32 become unnecessary, and furthermore, the same
function and effect as the speaker device of FIG. 2 can be obtained.
[0050]
The speaker device described above with reference to FIGS. 6 to 8 is suitable for installation in a
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small room such as a soundproof room for music practice having an indoor floor area of, for
example, about 1 to 4 tatami. As the soundproof room for music practice, it is possible to provide
the user with a speaker apparatus as shown in FIGS.
[0051]
FIG. 9 shows a speaker device according to a second embodiment of the present invention, and
the cross sections taken along the lines CC ′, DD ′ and EE ′ of the speaker device are shown
in FIG. , 11 and 12. The speaker apparatus according to the second embodiment develops the
two-dimensional wall surface reflection prevention concept adopted in the speaker apparatus of
FIG. 2 into a three-dimensional wall surface reflection prevention concept, and embodies the
concept related to this development It is.
[0052]
The speaker device 50 includes baffle plates 52, 54, 56, a speaker 16, and back plates 58, 60,
62. The baffle plates 52 to 56 are all fan-shaped having two sides orthogonal to each other. One
side of the two sides of the baffle plate 52 and one side of the two sides of the baffle plate 54 are
coupled so that the baffle plates 52 and 54 form an angle of approximately 90 °. The other side
of the two sides of the baffle plate 54 is connected to one of the two sides of the baffle plate 56
so that the baffle plates 54 and 56 form an angle of approximately 90 °. The other side of the
two sides of the baffle plate 52 is connected to the other side of the two sides of the baffle plate
56 so that the baffle plates 52 and 56 form an angle of approximately 90 °.
[0053]
At the front of the baffle plate 52, 54, 56, there are provided warps 64, 66, 68 that warp outward
from the front. The warped portions 64, 66, 68 have a smooth curved surface continuously on
the surface of the baffle plates 52, 54, 56 on the side where the baffle plates 52, 54, 56 make an
angle of 90 °. This is to prevent the disturbance of the frequency characteristic due to the
diffraction of sound as described above with reference to the embodiment of FIG.
[0054]
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A speaker hole S is provided in a corner portion generated by the combination of the baffle plates
52 to 56, and a speaker mounting plate 70 having a speaker hole corresponding to the speaker
hole S is attached to the corner portion. A speaker 16 is attached to the speaker attachment plate
70 so as to emit sound from the speaker hole S to the side of the baffle plates 52 to 56 which
forms an angle of 90 °. The speaker mounting plate 70 may be omitted, and the speaker 16
may be directly attached to the baffle plates 52 to 56.
[0055]
Each of the back plates 58, 60, and 62 is a fan-shaped one having two sides orthogonal to each
other, and is disposed to be spaced substantially parallel rearward from the baffle plates 52, 54,
and 56, respectively. One of the two sides of the back plate 58 and one of the two sides of the
back plate 60 are joined behind the junction of the baffle plates 52, 54 so that the back plates
58, 60 form an angle of approximately 90 °. It is done. The other side of the two sides of the
back plate 60 and one of the two sides of the back plate 62 are behind the joint of the baffle
plates 54, 56 so that the back plates 60, 62 form an angle of approximately 90 °. Combined
with The other side of the two sides of the back plate 58 and the other side of the two sides of
the back plate 62 form a junction of the baffle plates 52 and 56 so that the back plates 58 and
62 form an angle of approximately 90 °. Behind the. Baffle plates 52, 54, and 56 are connected
to front portions of the back plates 58, 60, and 62 via the curved portions 64, 66, and 68,
respectively.
[0056]
The back plates 58 to 62 are configured such that rear back plates 58a to 62a and front back
plates 58b to 62b are joined at a joint portion J as shown in FIGS. This is to simplify the assembly
operation as described above with reference to FIG. Each of the back plates 58 to 62 can also be
a plate without the joint portion J.
[0057]
The baffle plates 52 to 56, the back plates 58 to 62, and the curved portions 64 to 68 constitute
a closed cabinet, and the speaker 16 is disposed in the closed space in the cabinet. Since the back
plates 58 to 62 are coupled so as to form two 90 ° angles, the speaker device 50 has three
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corners of the back (rear portion of the cabinet) of the combined back plates 58 to 62 in the
room. It can be easily installed on the floor 36 in the room as it is disposed at the corner where
the ridge lines 25 27 29 intersect. In such an installation, the sound emitted from the speaker 16
is guided along the two walls 26, 28 and the floor 36 of the room on the side of the baffle plates
52 to 56 at an angle of 90 °. It will be. Therefore, the reflection of the sound from the walls 26
and 28 and the floor 36 does not occur, and at the listening point, the frequency characteristic
inherent to the speaker is obtained. The speaker device 50 can be disposed at the corner of the
ceiling instead of the speaker device 10 as shown in FIG. 8, and the same effect and advantage as
when disposed at the corner of the floor 36 can be obtained.
[0058]
In the embodiment shown in FIG. 9, the back plates 58, 60, 62 are all fan-shaped, but may be
triangular or the like as indicated by alternate long and short dash lines 58 ', 60', 62 '. In this
case, the shapes of the baffle plates 52 to 56 are the same as those of the back plates 58 to 62,
respectively. The cabinet can be made for wood processing or plastic molding or the like.
[0059]
FIG. 13 shows a modification of the embodiment shown in FIG. 9. The same parts as in FIGS. 9
and 10 are assigned the same reference numerals and detailed explanations thereof will be
omitted.
[0060]
The feature of the modification of FIG. 13 is that the rear back plates 58a, 60a, 62a constituting
the back plates 58, 60, 62 are omitted.
In this case, the speaker 16 is disposed immediately before the corner where the three ridges 25,
27 and 29 of the room intersect, and the back plates 58b, 60b and 62b are arranged along the
walls 26, 28 and the floor 36 constituting the corner A closed cabinet is configured, and the
speaker 16 is disposed in the enclosed space in the cabinet. According to such a configuration,
the back plates 58a, 60a and 62a become unnecessary, and furthermore, the same function and
effect as the speaker device of FIG. 9 can be obtained.
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[0061]
The speaker device shown in FIG. 13 can be arranged at the corner of the ceiling 38 instead of
the speaker device 10 shown in FIG. 8, and the same function and effect as when arranged at the
corner of the floor 36 can be obtained. The speaker device shown in FIG. 13 is suitable for being
installed in a small room such as a soundproof room for music practice in the same manner as
the speaker device described above with reference to FIGS.
[0062]
In the speaker apparatus described above with reference to FIGS. 1 to 13, the combination of the
baffles, the combination of the back plates, or the combination of the curved portions of the
baffles and the back plate may be either integral bonding or bonding. Good. In addition, for the
installation of the speaker device, it is possible to use a mounting method using a metal fitting or
bonding.
[0063]
It is a cross-sectional view for demonstrating the principle of the speaker apparatus based on this
invention. FIG. 1 is a perspective view showing a speaker device according to a first embodiment
of the present invention. It is a front view of the speaker apparatus of FIG. It is a cross-sectional
view which follows the A-A 'line ¦ wire of FIG. It is sectional drawing which expands and shows
the speaker and speaker mounting part of FIG. It is a perspective view showing the speaker
apparatus concerning the 1st modification of a 1st embodiment. FIG. 7 is a cross-sectional view
taken along the line B-B ′ of FIG. 6; It is a perspective view showing the speaker apparatus
concerning the 2nd modification of a 1st embodiment. It is a perspective view which shows the
speaker apparatus based on 2nd Embodiment of this invention. FIG. 10 is a cross-sectional view
taken along the line C-C ′ of FIG. 9; It is sectional drawing in alignment with the D-D 'line ¦ wire
of FIG. It is sectional drawing in alignment with the E-E 'line ¦ wire of FIG. It is sectional drawing
which shows the speaker apparatus which concerns on the modification of 2nd Embodiment. It is
a cross-sectional view which shows the example which has arrange ¦ positioned the conventional
speaker apparatus in the vicinity of the wall in the room. It is a characteristic view which shows
the frequency characteristic in the listening point which considered the sound reflection from the
wall in the example of arrangement ¦ positioning of FIG. It is a characteristic view which shows
the frequency characteristic in the listening point which considered the sound reflection from the
other wall in the example of arrangement ¦ positioning of FIG. FIG. 17 is a characteristic diagram
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showing frequency characteristics obtained by combining the frequency characteristics of FIG.
15 and FIG. 16; It is a layout which shows the state which each arrange ¦ positioned the speaker
apparatus in two mirror image positions regarding the speaker apparatus of FIG. It is a layout
which shows the state which embed ¦ buried the speaker apparatus in the corner of the room.
Explanation of sign
[0064]
10, 50: speaker device, 12, 14, 52, 54, 56: baffle plate, 16, 16 (1) to 16 (N): speaker, 18, 20, 58,
60, 62: back plate, 22, 24 , 64, 66, 68: Warpage, 26, 28: Room wall, 30, 70: Speaker mounting
plate, 32, 34: Lid plate, 36: Room floor, 38: Room ceiling.
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