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JP2010193228

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2010193228
The present invention is directed to a speaker system in which a plurality of identical speakers
are arranged to face each other in order to increase sound pressure. . A speaker system X in
which at least N (N ≧ 3) identical speaker units 20 are fixed to a housing 10, the front side of
each of the speaker units 20 is directed inward to the housing 10 A rotationally symmetric
cylindrical inner wall portion 11 fixed so as to be exposed and an enclosure portion covering the
back side of each of the speaker units 20 are provided, and each of the speaker units 20 is on a
virtual circumference. , And fixed so as to be directed to a predetermined point on a central axis
orthogonal to the center of the circumference. [Selected figure] Figure 2
スピーカーシステム
[0001]
The present invention relates to a speaker system in which a plurality of identical speaker units
are fixed to a housing.
[0002]
A speaker system in which a plurality of identical speaker units are arranged, such as a tone snail
type speaker system, has an advantage that the sound pressure can be increased while
maintaining the quality of the high-pitched part using relatively small speakers.
However, when the speaker units are arranged in the same plane, the sound sources are
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arranged in a plane or in a line, resulting in a problem that the sound image is enlarged and
localization is likely to be disturbed. On the other hand, as a method for coping with such a
problem using a plurality of identical speaker units, a plurality of identical speaker units are
disposed to face each other in FIG. The invention is shown to transmit vibrations in a direction
generally perpendicular to the plane. According to this method, the sounds of the opposing
speakers are synthesized and increased, and the speakers are not lined up and down.
[0003]
Patent Document 1: JP-A-H07-143588 Figure 6 Paragraphs [0030] to [0033]
[0004]
By the way, since the invention described in the above-mentioned Patent Document 1 is such that
the left and right speakers are opposed to each other, the output sound has different directivity
in the vertical and horizontal directions and the directivity of the sound in the left and right The
problem of narrowing arises.
In view of such problems, the present invention is a speaker system in which a plurality of
identical speakers are arranged to face each other in order to increase the sound pressure, and
the directivity of sounds close to the point sound source and in the upper, lower, left, and right
The task is to make the
[0005]
In order to solve the above-mentioned subject, the present invention has the following
composition. The invention according to claim 1 is a speaker system in which at least N (N ≧ 3)
identical speaker units are fixed to a housing, and in the housing, the front sides of the respective
speaker units face inward. A rotationally symmetric cylindrical inner wall portion fixed so as to
be exposed and an enclosure portion covering the back side of each speaker unit. The speaker
units are arranged at equal intervals on a virtual circumference, and fixed so as to be directed to
a predetermined point on a central axis orthogonal to the center of the circumference. The
central axis orthogonal to the center of the virtual circumference coincides with the axis of the
rotation center of the inner wall. The invention according to claim 2 is that, in the speaker
system, a space formed by the cylindrical inner wall portion is a right cylindrical shape or a right
prism, and the speaker unit is directed to the center point of the circumference. It is. The
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invention according to claim 3 is characterized in that, in the speaker system, the cross section of
the inner wall section cut by an arbitrary plane orthogonal to the central axis is a regular Nsquare, and each of the speakers constitutes an inner wall section It is fixed to the part. The
invention according to claim 4 is that in the above speaker system, the N is an even number. The
invention according to claim 5 is the speaker system, wherein the housing is provided with a
back plate that closes one opening of a cylindrical inner wall. According to a sixth aspect of the
present invention, in the speaker system according to the fifth aspect, a speaker unit for higher
frequency range than the speaker unit is fixed to the back plate. The invention according to claim
7 is that in the speaker system, a horn is fixed to an open opening of the cylindrical inner wall
portion.
[0006]
According to the first aspect of the present invention, three or more identical speaker units are
arranged symmetrically on the central axis of the cylinder and directed to one point on the
central axis on the cylindrical inner wall, so that the sounds overlap each other. Since the sound
pressure is increased and the speaker units are three-dimensionally arranged, the directivity of
the sound emitted from the opening of the cylindrical inner wall in the vertical and horizontal
directions can be made uniform. In the invention according to claim 2, since the plane waves
emitted from the diaphragms of the respective speaker units are parallel to each other, these
plane waves can be efficiently overlapped. In the invention according to claim 3, since the inner
wall surface has a regular polygonal cross section having the number of sides corresponding to
the number of speaker units, each speaker unit has the same height, and the center of the plane
constituting the inner wall surface It is possible to simply arrange the speaker units at equal
intervals along a virtual circumference and to face one point of a central axis orthogonal to the
center of the circumference simply by fixing the position. According to the fourth aspect of the
invention, when the number of speaker units is an even number, two speaker units are arranged
to always face each other, so plane waves generated from the diaphragms of the opposing
speaker units are parallel and straight. It can overlap and can suppress the interference of sound.
Invention of Claim 5 suppresses reflection from the wall behind a speaker system, etc. by closing
a part of opening which becomes the back side of an inner wall part by a backplate, and
eliminates interference of an extra sound. Can. According to the sixth aspect of the present
invention, the provision of the speaker unit for the high range compensates for the high-pitched
portion which tends to lower the efficiency by overlapping the sounds, and the contour of the
sound can be made clear, and the relative bass is relatively low It can also be better. In the
invention according to claim 7, by fixing the horn to the opening of the front surface of the inner
wall portion, the connection between the sound ranges generated from the opening can be made
smooth.
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[0007]
It is a perspective view of a speaker system concerning an embodiment. It is a cross-sectional
view of the speaker system concerning an embodiment. It is a longitudinal section of a speaker
system concerning an embodiment. (A)-(b) is a cross-sectional view which shows the modification
of a speaker system. It is a longitudinal cross-sectional view which shows the other modification
of a speaker system.
[0008]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 shows a perspective view of a speaker system X according to the present
embodiment, FIG. 2 shows a transverse sectional view of the speaker system X, and FIG. 3 shows
a longitudinal sectional view of the speaker system X. In the speaker system X, six speaker units
20 and a speaker unit 30 serving as a tweeter are fixed to a housing 10. A horn 40 is fixed to the
front of the housing 10. The casing 10 can be formed between a cylindrical inner wall 11 having
a regular hexagonal columnar space inside, a larger regular hexagonal cylindrical outer wall 12
provided on the outer periphery of the inner wall, the inner wall 11 and the outer wall 12 A
partition plate 13 for partitioning the space, a first back plate 14 for closing the back side of the
space formed between the inner wall portion 11 and the outer wall portion 12, a second back
plate 15 for closing the back side of the cylindrical space of the inner wall portion 11; It is
comprised from the front plate 16 which closes the front side of the space made between the
inner wall part 11 and the outer wall part 12, and the base part 17 which made the flat
hexagonal ring shape which fixes a horn. A bar-like member 15a that smoothly connects the
corner portions is provided at the corner portions formed by the second back plate 15 and the
inner wall portion 11, so that corners are not generated at the bottom of the inner wall portion
11. .
[0009]
Openings for fixing the speaker units 20 are formed at the same height on the center line in the
width direction of each surface constituting the inner wall portion 11, and the speaker units 20
are fixed so as to face inward. Thus, the speaker units 20 are equally spaced from one another on
the circumference, and the speaker units 20 are fixed to be directed to the center point of the
circumference. In addition, as for the width | variety of each plane part which comprises the
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inner wall part 11, it is desirable to set it as the minimum width which can attach the speaker
unit 20. FIG. Further, the tweeter 30 is fixed at the center of the second back plate 15 closing the
back side of the inner wall portion 11 so as to face the front. The mounting position of the
second back plate 15 is approximately the distance between the middle point of the opposing
speaker units 20 and the vibration plane of the speaker unit 20 and the distance between the
middle point and the vibration plane of the speaker unit 30 which is a tweeter. It is determined to
match.
[0010]
The outer wall 12 and the inner wall 11 are offset from each other by 30 degrees in the
rotational direction with respect to the central axis, and the partition plate 13 has six apexes
outside the inner wall 11 and the outer wall 12 as shown in FIG. Six pieces are provided so as to
connect the middle point portions of the six sides opposite to these apex portions on the inner
side. Thus, a tubular space having six cross-sectional pentagonal shapes is formed between the
outer side of the inner wall portion 11 and the inner side of the outer wall portion 12, and this is
closed by the first back plate 14 and the front plate 16, Six enclosure parts covering the back
side of each of the six speaker units 20 are formed. The speaker unit 20 uses a speaker unit for
full range or for a woofer. The respective speaker units 20 are connected in series and parallel so
as to generate in-phase sound. The speaker unit 30 uses a horn tweeter. The horn 40 is a short
horn of a tractor horn, and is fixed to the pedestal 17 so as to be connected smoothly to the front
opening of the inner wall 11.
[0011]
In the speaker system X having the above configuration, the sound is three-dimensionally
overlapped toward the center of the inner wall portion 11 in phase by the six speaker units 20.
Therefore, the sound pressure is increased and directivity in the vertical and horizontal directions
is obtained. It can be approached more evenly. In addition, since it is close to a point sound
source, it has an advantage of improving sound image localization. Furthermore, by using a
plurality of speaker units 20, the amplitude of the cone is relatively reduced, and distortion of the
reproduced sound at a large volume is reduced. Further, the vibration from each speaker unit 20
to the inner wall portion 11 can be offset and attenuated by the vibration of the opposing unit.
Furthermore, since the synthetic sound by the plurality of speaker units 20 tends to lower the
efficiency of the high-pitched part, the high-pitched part can be compensated by providing the
speaker unit 30 which becomes a tweeter, and six speaker units 20 Since the distance from the
speaker unit 20 to the center point of each of the speaker units 20 and the distance from the
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speaker unit 30 to the center point are equal, it is possible to suppress the sound shift between
the high range and the mid-low range. And by providing the speaker unit 30 which becomes a
tweeter on the central axis of the inner wall part 11, the advantage that a sound image
localization becomes good also arises. And by the structure which synthesizes the sound from the
six speaker units 20, the sway phenomenon of the diaphragm is reduced compared to the flat
baffle, and the efficiency of the bass is improved, so the horn 40 is sufficient even with a short
horn. Can be smoothened. In addition, by providing an enclosure on each of the backs of the six
speaker units 20, it is possible to suppress the decrease in sound pressure to the front side,
suppress the sound to the back side of each speaker unit, and provide an enclosure for each
speaker Thus, it is possible to clear the sound by preventing the interference of the sounds of the
respective speaker units on the back side.
[0012]
In addition, although the number of the speaker units 20 fixed to the inner wall part 11 is six in
the said embodiment, if this number is three or more, arbitrary numbers can be selected. The
cross-sectional view which shows the speaker systems Y and Z which changed the number of the
speaker units 20 attached to an inner-wall part to FIG. 4 (a), (b) is shown. As shown to Fig.4 (a),
the speaker unit 20 may be odd. Further, as shown in FIG. 4B, the enclosure may cover the back
side of each speaker unit 20, and the shape may be any shape. Furthermore, the shape of the
inner wall portion 11 does not have to be a polygonal cylinder as shown in the above
embodiment and in FIGS. 4 (a) and 4 (b), and as in the speaker system V shown in FIG. The shape
may be cylindrical.
[0013]
Further, in the above embodiment, the inner wall portion 11 has a right hexagonal cylindrical
shape, and the speaker units 20 arranged at equal intervals on the circumference are fixed to be
directed to the center point of the circumference. As in the speaker system W shown in FIG. 5,
the inner wall 11D may be inclined to point to a point deviated from the center of the
circumference where the speaker units 20 are arranged. In this case, it is desirable that the point
at which the central axes of the speaker units intersect, which is the point at which the speaker
units 20 face, be contained in the cylinder constituting the inner wall portion 11.
[0014]
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Furthermore, in the above embodiment, although the enclosure of the speaker unit 20 is a closed
type, for example, it is conceivable to make a bass reflex type by making holes in a part of each
plane of the inner wall 11 so as to be symmetrical to each other. . Further, when the back side of
the place to be used has little reflection of sound, the back plate 15 and the speaker unit 30
serving as a tweeter may be eliminated. In this case, it is desirable to use the speaker unit 20 for
full range. Then, since the speaker units provided on the inner wall 11 may be arranged at equal
intervals on the circumference, it is possible to provide two or more speaker unit groups. For
example, in the above embodiment, when the speaker unit for woofer and the speaker unit for
squawker are arrayed with one six speaker unit being skipped, three speaker units for woofer are
equally spaced on the circumference. At the same time, three speakers for the squawker will be
arranged at equal intervals on the circumference at a position shifted by 60 degrees. Such a
configuration also makes it possible to configure a speaker system of three or more ways.
[0015]
X, Y, Z, V, W Speaker system 10, 10A, 10B, 10C, 10D chassis 11, 11A, 11B, 11C, 11D inner wall
15 second back plate 20 speaker unit 30 speaker unit (tweeter) 40 horn
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