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JPH0888891

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0888891
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
directional speaker which allows one or several people to hear a limited range of sound without
leaking the surrounding sound.
[0002]
2. Description of the Related Art Today, a speaker is proposed that allows the sound from a
specific speaker to be heard only in a part of a large space, and this speaker has a parabolic
curve or a spheroidal surface. There are some which are made to give directivity to the sound
emitted from the speaker using a reflection directional plate which is a curved surface forming a
curve such as a curve (for example, JP-A-2-87797, JP-A-3-128597, JP-A 5-207584).
[0003]
[0003] Since this directional speaker is such that the sound from the speaker can be heard just
under the speaker without dividing the room, for example, in an exhibition hall etc, standing in
the area immediately before each exhibit Allows you to listen to descriptions of the exhibits
without using devices such as earphones, and even when broadcasting different content in one
room, you can only stand for the desired sound by standing in a certain position It can be heard
clearly.
[0004]
SUMMARY OF THE INVENTION As described above, in the directional loudspeaker using the
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reflection directional plate forming the paraboloidal curve or the spheroid curve, the sound
becomes clear only at a predetermined position. Since it is possible to make it audible, it is
possible to arrange a plurality of directional speakers in a room to broadcast different sounds
and to clearly transmit a plurality of pieces of information having different contents. However,
the wavelength of the range frequency is taken into consideration, and the diameter of the
opening is usually as large as 1 m to several m, so that the installation becomes difficult.
[0005]
In addition, the number of speakers that can be heard by one speaker is limited to one or a few,
and a plurality of speakers are usually installed in one room so that different sounds flow from
each speaker. In many cases, a plurality of units are provided in a limited space, and it is
particularly desirable to facilitate the installation of individual speakers, and in general, it can be
suspended to hear sounds directly under the speakers It is also desirable that they be lightweight
and lightweight.
[0006]
SUMMARY OF THE INVENTION According to the present invention, in a speaker in which a
speaker unit is provided inside a reflection directing plate having a substantially hemispherical
shape, a plate shape along the curved surface of the reflection pointing plate inside and outside
the reflection directing plate The outer and inner support plates are fixed so as to sandwich the
reflective directional plate, and the support portion of the directional speaker is attached to the
external support plate fixed to the outer side of the reflective directional plate. A support rod is
attached to the fixed inner support plate, and the speaker unit is supported inside the reflection
directional plate.
[0007]
The reflection directional plate may form an annular reinforcing portion at its lower end.
In addition, when the speaker unit is supported by the support bar, the speaker unit may be
stored upward in the inside of the sound generator housing, and the sound generator housing
may be supported by the support bar.
And, the lighting device may be stored inside the lower part of the sound generator storage part.
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[0008]
Furthermore, in the case where the lighting device is stored in the sound generator housing
portion, a slide plate or a liquid crystal projector may be disposed below the lighting device, or a
slide plate may be disposed on the side of the lighting device.
Further, the reflection directional plate of this directional speaker is formed by a bowl-shaped
upper reflection portion forming a part of a spherical surface, and an annular lower reflection
portion having a spherical shape of curvature continuous to the curvature of the upper reflection
portion. In some cases, the upper reflection portion and the lower reflection portion can be made
detachable so that the reflection directional plate can be divided into two.
[0009]
[Operation] Since the present invention is a speaker for supporting the speaker unit inside the
substantially hemispherical reflection direction plate, the sound from the speaker unit is reflected
by the reflection direction plate toward a specific range. The external support plate and the
internal support plate support the reflective directional plate by attaching the support portion to
the external support plate. It is possible to support the reflection directing plate and to support
the reflection directing plate without applying an excessive force to the local part of the
reflection directing plate.
Furthermore, since the speaker unit is supported by the inner support plate, the speaker unit can
be suspended so that the force applied to the inner support plate can be supported by the outer
support plate without adding the weight of the sound generator housing to the reflection
direction plate. It is also possible to eliminate the need to provide the reflective directional plate
with an unnecessary intensity.
[0010]
When the annular reinforcing portion is formed at the lower end of the hemispherical radiation
plate, the reflection directional plate can be made light and thin while preventing the strength
reduction of the reflection directional plate.
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Also, if the speaker unit is housed in the sound generator housing and supported by the support
rod inside the reflection direction plate, not only the speaker unit alone but also other devices
can be combined with the speaker unit and incorporated in the directional speaker. In the case
where the lighting apparatus is housed inside the lower part of the sound generator housing, it is
possible to clearly indicate the range in which the sound from the directional speaker can be well
separated by spot lighting.
[0011]
When a slide plate or a liquid crystal projector is disposed below the lighting device, a pattern,
characters, etc. can be projected on the floor when illuminating the audible range by the slide
plate or the like. It is also possible to add movement to a pattern or the like, and when the slide
plate is arranged on the side of the illumination device, the slide plate can reflect the pattern or
characters on the reflection directional plate.
[0012]
Further, the reflective directional plate, in which the reflective directional plate is separated into
the upper reflective portion and the lower reflective portion and can be detached, is separated by
a small size for convenient transportation, and the lower reflective portion or the It becomes
possible to easily perform exchange with a lower reflection portion of different materials, and
further, conversion to a lower reflection portion of different size and curvature as a reflection
directional plate.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present
invention, as shown in FIG. 1, a directional speaker in which a sound generator housing portion
41 housing a speaker unit 42 is disposed inside a reflection directing plate 11 having a
substantially hemispherical shape. 10, for example, three wires 24 are extended from the wire
fixture 23 provided with the wire support hooks 22 and the reflection pointing plate 11 is
suspended by the wire 24 as a support and the suspension support 21 by the wire fixture 23 It is
a thing.
[0014]
In fixing the wires 24 of the suspension support portion 21 to the reflection direction plate 11,
as shown in FIG. 2, a support plate 30 having a plate-like main portion 31 and an attachment
portion 33 is used. As shown, the screw 26 is penetrated through the through hole 32 of the
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support plate main body 31 so as to sandwich the predetermined position of the reflection
direction plate 11 by the two support plates 30, and the nut 27 makes the inside and outside of
the reflection direction plate 11 The support plate 30 is fixed, and the support plate 30 fixed to
the outside of the reflection direction plate 11 is an external support plate 35, and the support
plate 30 provided inside the reflection direction plate 11 is an inner support plate 36.
[0015]
Although the main body portion 31 of the support plate 30 is formed into a plate shape slightly
curved according to the curvature of the reflective directional plate 11, the diameter of the
reflective directional plate 11 is larger than that of the support plate main body 31. When it
becomes, even if it is a flat form of a simple plane, it can be used as a shape according to the
curved surface of reflective direction board 11. As shown in FIG.
The end of the wire 24 of the suspension support portion 21 is fixed to the attachment hole 34
of the external support plate 35, and the attachment position of each support plate 30 to the
reflection direction plate 11 is the center of the reflection direction plate 11. The equidistant
distance from the outer support plate 35 and the distance between the outer support plates 35
are all equal, so that the reflecting directional plate 11 can be easily stabilized and suspended by
the wires 24 of the same length.
[0016]
Further, the end portion of the support rod 55 is screwed into the mounting hole 34 of the inner
support plate 36, and as shown in FIG. As shown in FIG. 4, the speaker unit 42 mounted upward
is housed inside the speaker housing portion 41 and the speaker unit 42 having the speaker unit
42 directed to the center of the reflection direction plate 11 as shown in FIG. 4. To support.
[0017]
As described above, according to this embodiment, since the plate-like inner support plate 36
and the outer support plate 35 are screwed and the outer support plate 35 is supported by the
wire 24, the reflection is directed by the wire 24. When supporting the plate 11, two plateshaped support plates 30 are used to sandwich the inside and outside of the reflection direction
plate 11, so that the force is not concentrated on the local area of the reflection direction plate
11, and the reflection direction plate 11 is thin and lightweight The sound generator housing 41
is connected to the inner support plate 36 by the support rod 55, and the inner support plate 36
and the outer support plate 35 are screwed, and the outer support plate 35 is supported by the
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wire 24. Therefore, the load due to the weight of the sound generator housing 41 is borne by the
inner support plate 36 from the inner support plate 35 to the wire 24 and the weight of the
sound generator housing 41 is added to the reflection directional plate 11. It is possible to
reduce the thickness and reduce the thickness of the reflection pointing plate 11.
[0018]
The reflective directional plate 11 can be easily formed by using a synthetic resin such as acrylic
resin, and the transparent or semitransparent reflective directional plate 11 has a diameter of 1
m to 2 or 3 m. Even in the case of the directional speaker 10 in which the reflective directional
plate 11 of a certain degree is disposed overhead, it is possible to prevent the person who listens
to the sound from feeling oppressed.
In addition, as shown in FIG. 5, the use of a stained glass shape makes it visually enjoyable and
can eliminate the sense of intimacy, and the combination with the ceiling lighting can further
increase visual enjoyment.
[0019]
Furthermore, when giving a sense of lightness with a sticker or paint, or in accordance with the
contents of the broadcast sent from the speaker unit 42, it may be used such as painting a
pattern for advertising or promotion. .
Then, as shown in FIG. 6, a U-shaped angle made of aluminum is formed into an annular shape
according to the diameter of the reflective directional plate 11 at the end of the reflective
directional plate 11, and this angle is reflected as the annular reinforcing portion 19. It may be
attached to the end of the directional plate 11, or the end of the reflective directional plate 11
may be made thicker to form an annular reinforcing portion 19 to increase the strength of the
reflective directional plate 11.
[0020]
The reflection-oriented plate 11 is not limited to those made of synthetic resin, but may be made
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of a thin plate of a light alloy such as aluminum or stainless steel, and the reflection-oriented
plate 11 is made lightweight by using a synthetic resin foam material. There is also a plate 11.
Furthermore, as shown in FIG. 7, the sounding body storage portion 41 has a smooth curved
surface shape having an opening at the upper end of the sounding body storage portion 41 to
make the upper part substantially cylindrical and the lower part substantially conical. It has a
bullet shape and outputs the sound output from the speaker unit 42 from the opening to the
reflective directional plate 11 so that the sound reflected by the reflective directional plate 11 is
not disturbed around the sound generator housing 41 And a cylindrical shape having a smooth
curved surface.
[0021]
Further, as shown in FIG. 8, the illuminating device 46 is housed inside the lower part of the
sound generator housing 41, and the vicinity of the tip of the sound generator housing 41 is a
detachable tip cover 45. In some cases, a through hole is provided so that the lower floor surface
of the directional speaker 10 can be illuminated by the illumination device 46.
Thus, when illuminating the lower part of the directional speaker 10, there is an advantage that
the area where the sound can be heard by the directional speaker 10 can be easily specified.
[0022]
Furthermore, as shown in FIG. 9, when using a high brightness lighting device 46 such as a
projector lamp as the lighting device 46, the slide plate 49 is provided below the lighting device
46 to illuminate the floor with appropriate characters and figures. Sometimes they are projected
onto the floor.
As described above, when the lighting device 46 or the slide plate 49 is provided in the sound
generator housing portion 41, an appropriate character or figure is displayed on the floor to
explain the sound flowing through the directional speaker 10 or the sound flowing. It is possible
to express the implication pattern on the floor, and to make people who are near the speakers
and can not hear the sound interested in the sound flowing through the directional speaker 10.
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[0023]
A transparent window 47 is also provided on the side surface of the front end cover 45, and as
shown in FIG. 10, it has a slide plate 49 below and a cylindrical second slide plate on the side. 51
is provided, and the light of the illumination device 46 is also irradiated to the side through the
second slide plate 51 and the window 47, and the characters and figures of the second slide plate
51 may be projected on the reflection directional plate 11 .
[0024]
When reflecting characters or figures and patterns on the reflection-oriented plate 11, the
reflection-oriented plate 11 is made of a glass-glass translucent body, and as shown in FIG. 11,
the cylindrical slide plate 51 is directly attached. There is also a case where it is provided at the
lower end of the sounding body storage unit 41 to project the pattern of the slide plate 51 and
the like on the reflection directional plate 11 and illuminate the area directly below the
directional speaker 10, and as shown in FIG. A shield plate 48 is provided at the lower side while
providing the slide plate 51, and figures, patterns and characters may be projected only on the
reflection directional plate 11 without illuminating the floor with the illumination device 46.
[0025]
Further, a plate-like slide plate 49 is disposed below the illumination device 46 without the
cylindrical slide plate 51 being disposed to the side of the illumination device 46, and it is
changed to the shielding plate 48 to form a flat mirror Alternatively, a mirror such as a suitably
curved mirror or a conical shape may be disposed, and a figure, a pattern, or a character by a
slide plate 49 provided below the illumination device 46 may be reflected by the mirror and be
reflected only on the reflection directional plate 11.
[0026]
Further, in place of the flat slide plate 49, a liquid crystal plate is disposed below the lighting
device 46, and light passing through the liquid crystal plate is used to display figures and
patterns, and the figures and patterns by the liquid crystal plate are changed. A so-called liquid
crystal projector provided with a liquid crystal control device can also be disposed below the
lighting device 46.
In this embodiment, since the lightweight reflection directional plate 11 can be easily attached to
the ceiling or the like by the suspension support 21 as described above and the reflection
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directional plate 11 having the sound generator housing portion 41 is attached to the ceiling or
the like. The directional speaker 10 is capable of making only the immediate lower area of the
reflective directional plate 11 audible only in the audible range, and since the transparent or
translucent reflective directional plate 11 is used, a sense of oppression to a person under the
directional loudspeaker 10 Sound can be heard without giving the reflection pointing plate 11 in
a stained glass shape, or the lighting device storage portion 41 is provided with the lighting
device 46, and the slide plate 51 is disposed on the side of the lighting device 46 for reflection It
can be entertained visually by projecting figures and patterns on the directional plate 11. By
illuminating the floor directly below the directional speaker 10, it is possible to hear the sound,
indicating an area, and appropriately illuminating the floor. Sly patterns etc Those that can also
be projected by the plate 49 or the liquid crystal projector.
[0027]
When projecting a pattern or an image by the slide plate 49 or the liquid crystal projector, it is
possible to project an image for advertising or the like without being limited to the pattern or the
image related to the sound being broadcasted. .
In addition, the suspension support portion 21 is not limited to extending the three wires 24
from the wire fixture 23 having the support hooks 22, and the wires 24 or rod-like members
from the respective external support plates 35 provided on the reflection directional plate 11
May be used as a suspension support 21 for fixing each external support plate 35 to a ceiling or
the like, and in the case where the diameter of the opening is 1 m to several m, the number of
external support plates 35 is matched to the size and strength. Also, the number is not limited to
three, and may be four or five as appropriate.
[0028]
In the above embodiment, the diameter of the opening of the reflective directional plate 11 is 1
m to several m, and the aperture of the reflective directional plate 11 is suitable for listening to
broadcast contents to a plurality of people. In some cases, the section diameter is about several
tens of centimeters, so that one person can listen to the broadcast content.
In such a small directional speaker 10, the speaker unit 42 is directly supported by the support
rods 55 attached to the inner support plate 36, and the number of the support rods 55 is not
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limited to three or more. As shown, one external support plate 35 is provided outside the center
of the reflection directional plate 11 and one internal support plate 36 is provided inside the
center of the reflection directional plate 11, and the one support rod 55 is directed upward. The
speaker unit 42 may be supported.
[0029]
Incidentally, in the case of supporting the reflection direction plate 11 with the one inner support
plate 36 and the outer support plate 35 as described above, as shown in FIG. 14, a screw is
penetrated around the circular main body 31. It is preferable to form an inner support plate 36
or an outer support plate 35 with a support plate 30 having a through hole 32 to be formed and
a mounting portion 33 provided with a mounting hole 34 near the center of the main body 31. In
some cases, the directional speaker 35 may be suspended by a plurality of wires 24 by forming a
plurality of mounting portions 33.
[0030]
The small directional speaker 10 having an opening diameter of about several tens of
centimeters is suitable for viewing a small display while looking in, etc. A large number of small
directional speakers 10 are arranged, and the small directional speaker 10 is small. The sound is
broadcasted from the speaker unit 42 at a volume level so that the broadcast contents can not be
heard around by the reflection pointing plate 11. When the speaker unit 42 is directed upward
and the sound reflected by the reflection pointing plate 11 is heard Not only that, the speaker
unit 42 may be supported downward on the inside of the reflection directional plate 11, and the
sound from the speaker unit 42 may be reflected and used by the reflection directional plate 11
so as not to leak around.
[0031]
Furthermore, when supporting the reflective directional plate 11, as shown in FIG. 15, an annular
outer support plate 37 may be used.
Such an annular external support plate 37 is in the form of an annular plate conforming to the
curvature of the reflective directional plate 11, and the reflective directional plate 11 is closely
attached to the inside of the external support plate 37, as shown in FIG. An inner support plate
36 having a plate-like main body portion 31 is disposed at an appropriate interval inside the
reflective directional plate 11, and the inner support plate 36 is attached to the outer support
plate 37 with a screw. And sandwich the reflection direction plate 11.
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When the external support plate 37 is formed as a single annular support plate, the directional
speaker 10 can be supported by attaching the support column 29 firmly integrated with the
external support plate 37 as a support portion. It can also be suspended by a wire or the like as
in the previous embodiments.
[0032]
When a single external support plate is used, as shown in FIGS. 17 and 18, a curved external
support plate 38 may be used from the vicinity of the top of the reflection directing plate 11 to
the vicinity of the lower end thereof. When supporting the reflection direction plate 11 by the
outer support plate 38, the reflection direction plate 11 is fixed by the inner support plate 36
and the outer support plate 38 by screwing with the inner support plate 36 having the plate-like
main body 31. I support it.
[0033]
When the speaker unit 42 and the sound generator housing portion 41 are attached, a relatively
large support rod 55 is used, and a relatively large plate-like inner support plate 39 is formed at
the base of the support rod 55, The inner support plate 39 may be fixed to the outer support
plate 38 by screws or the like, or the support rod 55 may be connected to the support column 29
to support the sound generator storage portion 41 and the like. In addition, as another
embodiment of the reflective directional plate 11, as shown in FIG. 19, a bowl-shaped upper
reflecting portion 12 forming a part of a spherical surface and an annular lower reflecting
portion 15 forming a part of a spherical surface It may be set as the reflective directional plate
11 divided into two.
[0034]
As shown in FIG. 20, the upper reflecting portion 12 is formed with a continuous or
discontinuous annular outwardly projecting outward projecting portion 13 along the outer
periphery of the lower end of the upper reflecting portion 12, A continuous or discontinuous
annular inward projecting portion 16 is also provided along the upper end inner periphery at the
upper end inner periphery of the reflecting portion 15, and the spherical shape formed by the
lower reflecting portion 15 is the spherical shape formed by the upper reflecting portion 12 The
outer projecting portion 13 and the inward projecting portion 16 are engaged with each other by
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making the spherical shape continuous with the above, and the upper reflecting portion 12 and
the lower reflecting portion 15 are made detachable.
[0035]
Therefore, the outer support plate 35 and the inner support plate 36 are provided in the upper
reflection portion 12 and the upper reflection portion 12 is suspended and fixed to a ceiling or
the like by the suspension support 21 or the upper reflection portion 12 is annular outer support
plate 37 and the inner support plate 36 having the plate-like main body 31, and by engaging the
outward projection 13 and the inward projection 16 with the upper reflection portion 12, the
lower reflection portion 15 is obtained. The reflection directional plate 11 of the directional
speaker 10 can be attached to the upper reflection portion 12 to narrow the audible area, and as
shown in FIG. 21, the lower reflection portion 15 having a different lower end diameter of the
lower reflection portion 15 or As shown at 22, lower reflectors 15 having different heights h are
prepared, and by replacing the lower reflectors 15, directional speakers 10 having different
audible areas can be provided.
[0036]
Further, as shown in FIG. 23, the reflection directing plate 11 separated into the upper reflecting
portion 12 and the lower reflecting portion 15 is a place where the upper reflecting portion 12 is
housed and attached inside the lower reflecting portion 15. There is also the advantage that it
can be transported to the
In addition, the material of the lower reflection portion 15 is different from the material of the
upper reflection portion 12 to give a change in the reflectance due to the frequency, and among
the sounds emitted from the speaker unit 42, the reflectance of the highly diffuse bass region is
It is also possible to select the material of the lower lower reflection portion 15 or to perform the
sound absorption process on the inner surface of the lower reflection portion 15 to lower the
reflectance, and to make the timbre in the audible area closer to natural sound.
[0037]
As described above, the directional speaker 10 according to the present embodiment makes it
possible to clearly hear the sound in a predetermined area, and the description of the product,
the display or the display, etc., may be a product, an exhibit, etc. In the large one that can be
easily made to be able to be heard just before the event, but that can be heard by several people,
the advertising advertisement related to the exhibit etc. is displayed on the reflection-oriented
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plate 11 It also has the advantage of being able to appeal explanations and images to listeners
and users by hearing by means of sound and by means of visual perception.
[0038]
According to the present invention, according to the present invention, the inside and the outside
of the reflection directional plate are sandwiched by the plate-like support plates, the external
support plate is fixed to the support portion to support the reflection direction plate, and the
support is attached to the inner support plate. Because the rod supports the sound generator
housing, the force is not applied to the reflection direction plate, nor is the plate-like support
plate dispersed in supporting the reflection direction plate, so the reflection direction plate is thin
and lightweight As a result, it is possible to easily install a directional speaker.
[0039]
Further, in a directional speaker having an annular reinforcing portion at the lower end of the
reflective directional plate, the strength of the reflective directional plate can be enhanced by the
annular reinforcing portion, and it becomes easy to make the reflective directional plate thinner
and lighter. By making the board lightweight, installation of the directional speaker can be made
easier.
Moreover, since the invention described in Claim 3 uses a sound generator storage part when
supporting a speaker unit, it becomes easy to combine a speaker unit and another apparatus, and
to arrange | position inside a reflective direction board, In the invention described in item 4,
since the lighting device is housed in the sound generator housing portion, the lighting device
can illuminate directly below the directional speaker, and the audible area of the directional
speaker can be indicated by lighting. According to the fifth aspect of the present invention, since
the slide plate or the liquid crystal projector is disposed under the lighting device, it illuminates
the audible area and projects characters, figures, patterns, etc. that are associated with sound in
the audible area. Can be used to associate the sound being broadcasted with figures, patterns,
etc. that are being broadcasted, and draw interest in the sound from a position where the sound
can not be heard, In the invention described in 6, since the slide plate is disposed on the side of
the lighting device, the characters, figures, or patterns of the slide plate are projected on the
reflection directional plate to give visual enjoyment to people according to the sound. It is
possible to
[0040]
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In the seventh aspect of the present invention, since the reflection directing plate having a
substantially hemispherical shape can be divided into the bowl-shaped upper reflection directing
plate and the annular lower reflection directing plate, the diameter is 1 m to several m.
Directionality of the reflective directional plate, and the directivity can be easily changed by
changing the lower reflection portion to change the appearance of the reflective directional plate
or to change the reflection direction of the reflected sound. It is a reflection direction board of a
speaker.
[0041]
Brief description of the drawings
[0042]
1 is a side view of a directional speaker according to the present invention.
[0043]
2 is a plan view of a support plate used for the directional speaker according to the present
invention.
[0044]
3 is a diagram showing the mounting state of the support plate of the directional speaker
according to the present invention.
[0045]
4 is a vertical cross-sectional view showing the sound generator housing of the directional
speaker according to the present invention.
[0046]
5 is a view showing another embodiment of the reflection direction plate of the directional
speaker according to the present invention.
[0047]
6 is a cross-sectional view showing the end of the reflection direction plate in the directional
speaker according to the present invention.
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[0048]
7 is an external view showing an example of the sound generator housing of the directional
speaker according to the present invention.
[0049]
8 is a vertical sectional view showing another example of the sound generator housing of the
directional speaker according to the present invention.
[0050]
9 is a view showing another example of the sound generator housing portion of the directional
speaker according to the present invention.
[0051]
<Figure 10> The figure which shows the other example of the sounding object storage section
end cover of the directional speaker which relates to this invention.
[0052]
11 is a view showing another example of the sound generator housing portion of the directional
speaker according to the present invention.
[0053]
12 is a view showing another example of the sound generator housing portion of the directional
speaker according to the present invention.
[0054]
13 is a diagram showing another embodiment of a directional speaker according to the present
invention.
[0055]
14 is a plan view showing another embodiment of the support plate used for the directional
speaker according to the present invention.
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15
[0056]
15 is a rear view showing another embodiment of the external support plate used for the
directional speaker according to the present invention.
[0057]
16 is a side sectional view showing another embodiment of the external support plate used for
the directional speaker according to the present invention.
[0058]
17 is a side sectional view showing another embodiment of the external support plate used for
the directional speaker according to the present invention.
[0059]
18 is a rear view showing another embodiment of the external support plate used for the
directional speaker according to the present invention.
[0060]
19 is a side view showing a second embodiment of the reflection direction plate of the directional
speaker according to the present invention.
[0061]
FIG. 20 is an enlarged sectional view of an essential part in the second embodiment of the
reflection direction plate.
[0062]
21 is a view showing a modification of the second embodiment of the reflection direction plate.
[0063]
FIG. 22 is a view showing another modification of the second embodiment of the reflective
directional plate.
[0064]
FIG. 23 is a view showing a state in which the second embodiment of the reflection direction
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plate is stored and transferred.
[0065]
Explanation of sign
[0066]
DESCRIPTION OF SYMBOLS 10 Directional speaker 11 Reflection direction board 12 Upper
reflection part 13 Outward projection part 15 Lower reflection part 16 Inward projection part 19
Annular reinforcement part 21 Suspension support part 22 Support hook 23 Wire fixing tool 24
Wire 26 screw 27 Nut 29 post Reference Signs List 30 support plate 31 support plate main body
32 through hole 33 attachment portion 34 attachment hole 35, 37, 38 external support plate 36,
39 inner support plate 41 sounding body storage portion 42 speaker unit 45 tip cover 46
illumination device 47 window portion 48 shield plate 49, 51 Slide plate 52 Screw 55 Support
bar
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