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JP2010045492

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DESCRIPTION JP2010045492
PROBLEM TO BE SOLVED: To introduce a sound in a specific direction other than the sound
emission direction of a flat speaker. SOLUTION: A rectangular flat speaker 6 has a pair of sound
emitting surfaces 8 and 10 facing away from the two sound emitting surfaces 8 and 10 in a
direction substantially orthogonal to the sound emitting surfaces 8 and 10. It emits noise. The
derivative 12 is formed over the entire area of the lower end portion of the flat speaker 6. The
derivative 12 protrudes obliquely downward. A part of the sound emitted from the flat speaker 6
is guided obliquely downward along the derivative 12. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device, and in particular, to a flat speaker.
[0002]
The flat speakers include those disclosed in Patent Documents 1 and 2, for example, and a flat
wave that only spreads forward and backward is emitted from a pair of sound emission faces
facing away.
In other words, since the sound does not diffuse in other directions, it has an advantage that the
attenuation factor is smaller than the sound of the spherical wave by the point sound source, and
the sound can be delivered far without making a loud sound. .
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[0003]
Patent No. 3192372 Patent No. 3159714
[0004]
As described above, the flat speaker has an advantage that the sound can be well received in the
front-rear direction of the pair of sound emission planes. For example, as in the station yard, in
the long space in the traveling direction of the train, the traveling direction It is conceivable to
use a flat speaker in an announcement application to
However, since the station yard is also a space where people are crowded, it is desirable that the
location for installing the speakers be as small as possible and not in the way. As a place which
satisfies such conditions, it is said that it is on a bulletin board or attached to a ceiling, and
becomes a height of 3 m or more. If the sound emitting surface of the flat speaker is installed
horizontally at such a high level, the sound can be well received in the horizontal back and forth
direction, but the sound reaches the ear of the person under the flat speaker There is a problem
that it is difficult.
[0005]
Therefore, the present invention is a speaker device that can deliver sound in a specific direction
other than the sound emission direction of the flat speaker while making use of the inherent
merit of the flat speaker, that is, the merit that the sound reaches well in the front and back
direction of the sound emitting surface. Intended to provide.
[0006]
The speaker device of one embodiment of the present invention includes a flat speaker.
The flat speaker has a sound emitting surface and emits a plane wave in the direction orthogonal
to the sound emitting surface. A derivative is provided at the end of this sound emitting surface.
The derivative protrudes in the specific direction from the end of the sound emitting surface. As a
derivative, a curved one may be used, or a linear one may be used.
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[0007]
In the speaker device configured in this way, a part of the plane wave emitted in the direction
orthogonal to the sound emission surface is guided along one side of the plane speaker by being
wound around (that is, diffracted) along with the projecting derivative. Be done. The derivative
does not diffuse the energy in the traveling direction of the plane wave unnecessarily, but only
guides a part of the emitted plane wave in a specific direction, so the sound is generated in the
direction orthogonal to the emitting surface of the planar speaker. Can deliver sound in specific
directions as well.
[0008]
A frame can be provided around the sound emitting surface of the flat speaker.
[0009]
By providing the frame in this manner, sound can be prevented from diffusing in directions other
than the orthogonal direction of the sound emitting surface and the specific direction.
[0010]
The flat speaker may also have a pair of sound emitting faces facing away.
In this case, the derivatives can be provided symmetrically with respect to each of the sound
emitting surfaces.
By this configuration, the sound can be well delivered in the front and back direction, and the
same effect, that is, the sound can be delivered in the specific direction regardless of which side
is the front or the back. For example, it is suitable for the use which announces in an elongated
area, such as a platform of a station.
[0011]
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The derivative can be provided obliquely downward on the lower end side of the flat speaker. For
example, the derivative may be provided at the upper end or both ends other than the lower end,
but if provided at the lower end obliquely downward, for example, a plane near the ceiling of the
building or above the platform of the station Even when the speaker is arranged, a person near
the lower side can hear the voice.
[0012]
In addition to this, the top end of the flat loudspeaker can also project another conductor
pointing in the particular direction. With such a configuration, the sound can be guided obliquely
downward not only from the lower end but also from the upper end, and even in the case where
a flat speaker is disposed near the ceiling of the building or above the platform of the station,
People in the vicinity can hear the voice more clearly.
[0013]
As described above, according to the present invention, it is possible to diffuse and deliver sound
in a specific direction other than the sound emission direction of the flat speaker without
unnecessarily diffusing the plane wave.
[0014]
The speaker device 2 according to the first embodiment of the present invention is, as shown in
FIG. 2, at a height of, for example, about 3 m, as on the ceiling 4 of a station yard or an electric
bulletin board (not shown). It is attached and used, and has a flat speaker 6 as shown in FIG.
The flat speaker 6 is formed, for example, in a flat rectangular shape, and has a pair of sound
emitting surfaces 8 and 10 facing in the back. As shown by the arrow a in FIG. 1, in the flat
speaker 6, the sound is amplified from the sound emitting surfaces 8 and 10 in the direction
orthogonal to these. The flat speaker 6 is disposed so as to be perpendicular to the direction in
which the sound emitting surfaces 8 and 10 intend to emit sound, and is attached to a ceiling or
the like. The structure of the flat speaker 6 is not described in detail because it is disclosed in the
above-mentioned Patent Document 1, but it is a flat speaker of the structure disclosed in Patent
Document 2 or a flat speaker of another structure. May be
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[0015]
At one end of the flat speaker 6, for example, the lower ends of the sound emitting surfaces 8
and 10, derivatives 12 and 12 are provided. The derivatives 12 and 12 are provided on the entire
lower end portion of the sound emission surfaces 8 and 10, and are separated from the sound
emission surfaces 8 and 10 obliquely downward with respect to the lower end portions of the
sound emission surfaces 8 and 10 Are configured to expand outward of the sound emitting
surfaces 8 and 10 according to That is, the derivative 12 spreads to the outside of the sound
emitting surfaces 8 and 10 as it deviates outward from the sound emitting surfaces 8 and 10 in a
direction orthogonal to the sound emitting surfaces 8 and 10. In this embodiment, the derivatives
12 are formed symmetrically on the side of the sound emitting surfaces 8 and 10, and are curved
in a convex shape on the flat speaker 6 side, that is, upward.
[0016]
In the speaker device 2, the voice is emitted as a plane wave in the direction orthogonal to the
sound emitting surfaces 8 and 10, and a part thereof is obliquely inclined by being diffracted
along the projecting derivative 12 as indicated by the arrow b. Induced to Therefore, as shown in
FIG. 2, persons 14 and 14 obliquely below the speaker device 2 can also hear the sound from the
flat speaker 6.
[0017]
A speaker device 2a according to a second embodiment of the present invention is shown in FIG.
In the speaker device 2a of this embodiment, in the speaker device 2 of the first embodiment, the
area excluding the lower end portion of the flat speaker 6, that is, the upper end portion and both
side end portions are integrally surrounded by the frame 16. is there. The same reference
numerals are given to parts equivalent to the speaker device of the first embodiment, and the
description will be omitted. The speaker device 2 a is also mounted at the high place in the
station yard, similarly to the speaker device 2.
[0018]
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The flat loudspeaker shown in FIG. 5 without the conductor 12 and the frame 16 and measured
at every 10 ° up to 90 ° upward with 0 ° just below the flat loudspeaker 6 as shown in FIG.
Frequency to sound pressure characteristics of the three speaker devices 2a are shown in FIG. 6
to FIG. 6 (a) is a frequency characteristic diagram of 0 degrees, FIG. 6 (b) is a frequency
characteristic diagram of 10 degrees, FIG. 7 (a) is a frequency characteristic diagram of 20
degrees, and FIG. 8 (a) is a frequency characteristic diagram of 40 degrees, FIG. 8 (b) is a
frequency characteristic diagram of 50 degrees, and FIG. 9 (a) is a frequency characteristic
diagram of 60 degrees. (B) is a frequency characteristic diagram of 70 degrees, FIG. 10 (a) is a
frequency characteristic diagram of 80 degrees, and FIG. 10 (b) is a frequency characteristic
diagram of 90 degrees. 6 to 10 show the frequency characteristics of the speaker device of FIG. 5
and FIG. 6 shows the frequency characteristics of the speaker device of FIG. 3.
[0019]
For example, focusing on 1 KHz, at 0 degrees, both the flat speaker without the derivative 12 and
the frame 16 shown in FIG. 5 and the speaker apparatus of FIG. The sound pressure rises to 68
dB and to about 69 dB in FIG. 3, and at 20 degrees, the sound pressure further increases to about
72 dB in FIG. 5 and about 74 dB in FIG. At 30 degrees, the sound pressure further increases to
approximately 76 dB in FIG. 5 and approximately 78 dB in FIG. 3. At 40 degrees, the sound
pressure continues to increase at approximately 78 dB in FIG. 5 and approximately 80 dB in FIG.
At 50 degrees, it rises to 79 dB in FIG. 5 and 81 dB in FIG. 3, but the increase is gradual. At 60
degrees, the sound pressure rises to 80 dB in FIG. 5 and to 82 dB in FIG. 3, but the growth is
gradual. At 70 degrees, the growth is also slow, about 82 dB in FIG. 5 and 83 dB in FIG. At 80
degrees, it is about 82 dB in FIG. 5, and about 83 dB in FIG. 3, and at 90 degrees, it is about 83
dB in both FIG. 5 and FIG. The same tendency can be read at other frequencies, and by providing
the derivative 12 and the frame 16 in the range of 10 degrees to 40 degrees, the sound pressure
is increased more than in the case where it is not provided.
[0020]
The speaker apparatus 2b of 3rd Embodiment is shown in FIG. This speaker device 2b is
provided with another derivative 12a, 12a in the entire area of the sound emitting surfaces 8, 10
on the upper end portion of the frame 16 of the planar speaker 2a. In this speaker device 2b, the
derivatives 12a, 12a are inclined in a straight line toward the lower side so as to form an angle of
about 30 degrees with the direction perpendicular to the sound emitting surfaces 8, 10,
respectively. It is symmetrical. This speaker device 2b is also mounted at a high place such as a
station yard in the same manner as the speaker devices 2 and 2a, and voices are emitted as plane
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waves in the direction orthogonal to the sound emitting surfaces 8 and 10 as in the speaker
devices 2 and 2a. While being sounded, a part of the sound is guided obliquely downward from
the lower surface and the upper surface of the sound emitting surfaces 8 and 10 by the
derivatives 12, 12, 12a and 12a, respectively.
[0021]
As shown in FIG. 12, curved derivatives 12b and 12b can be provided instead of the derivative
12a. In this case, the derivatives 12 b and 12 b are respectively formed to be convex downward
as opposed to the derivative 12 and are formed symmetrically to each other. Alternatively,
without providing the frame 16a, the derivative 12 may be provided at the lower end of the
sound emitting surfaces 8, 10 of the flat speaker 6, and the derivative 12a, 12a or 12b, 12b may
be provided at the upper end.
[0022]
In each of the above embodiments, the derivatives 12 and 12a are provided on the side of the
sound emission faces 8 and 10, respectively. However, the derivatives 12 and 12a may be
provided on only one side. Moreover, although the flat speaker 6 used what has the sound
emission surfaces 8 and 10 which turned to the back, the flat speaker which has only any one
sound emission surface can also be used. In this case, the derivative may be provided only on the
sound emitting surface side.
[0023]
It is a perspective view of the speaker apparatus of the 1st Embodiment of this invention. It is a
figure which shows the attachment state of the speaker apparatus of FIG. It is a perspective view
of the speaker apparatus of the 2nd Embodiment of this invention. It is a figure which shows the
measurement position of the sound pressure characteristic of the speaker apparatus of FIG.3 and
FIG.5. It is a perspective view of the flat speaker which remove | excluded the derivative from the
speaker apparatus of FIG. It is a sound pressure versus frequency characteristic figure in 0
degree and 10 degrees of a speaker apparatus of FIG.3 and FIG.5. FIG. 6 is a graph showing
sound pressure versus frequency characteristics at 20 degrees and 30 degrees of the speaker
device of FIG. 3 and FIG. 5. FIG. 6 is a sound pressure versus frequency characteristic diagram at
40 degrees and 50 degrees of the speaker device of FIGS. 3 and 5; FIG. 6 is a sound pressure
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versus frequency characteristic diagram at 60 degrees and 70 degrees of the speaker device of
FIGS. 3 and 5; FIG. 6 is a graph showing sound pressure versus frequency characteristics at 80
degrees and 90 degrees of the speaker device of FIG. 3 and FIG. 5. It is a perspective view of the
speaker apparatus of the 3rd Embodiment of this invention. It is a side view of the modification
of the speaker apparatus of FIG.
Explanation of sign
[0024]
6 flat speaker 8 10 sound emitting surface 12 derivative 16 frame
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