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JPH05276590

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DESCRIPTION JPH05276590
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
directional speaker device used as a broadcasting facility such as a public address.
[0002]
2. Description of the Related Art In recent years, personalization of electronic devices has
progressed at a great pace, and the desire to transmit only to a specific range or to a specific
person is also realized specifically even in public addresses. It is a situation.
[0003]
The conventional directional speaker device will be described below.
FIG. 2 is a plan view of the conventional directional speaker device, and FIG. 3 is a cross-sectional
view showing the F-G-H-I-J cross section thereof.
[0004]
In FIG. 2 and FIG. 3, 1 is a spherical shell reflector horn for reflecting sound. A small box 2
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containing a speaker generates a sound. 3 is a wiring cord to the speaker, 4 is a small box
mounting bracket, 5 is a hanging bracket for the entire directional speaker device.
[0005]
The operation of the directional speaker device configured as described above will be described
below.
[0006]
First, an electrical signal of sound passes through the wiring cord 3 and is applied to the speaker
in the small box 2 containing the speaker to generate a sound.
Since the opening of the speaker is provided to face the reflector horn 1, the generated sound is
reflected from the small box 2 by the reflector horn 1 as shown by the broken line in FIG. 3. The
curvature curve of the reflector horn 1 is composed of an elliptical body, and the speaker of the
small box 2 as a sound source is disposed at one of the two focal points of the elliptical circle as
the sound source, and around the other focal position X2. If the configuration is such that the
listener's ear comes, the sound from the speaker can be collected at the listening point X2, and
even if it is heard under the reflector horn 1, the sound is considerably attenuated away from the
X2 position Therefore, it is possible to tell only those who are in a certain area.
[0007]
However, since the reflector horn 1 of the directional speaker device configured as described
above has been made of a material such as glass reinforced plastic, transparent acrylic, etc., it
should be packaged in a small size. It was difficult, and a large loss occurred in transportation
and movement. Further, in order to ensure the strength of the reflector horn 1 itself, the weight
of the reflector horn 1 is so heavy that a reinforcement work is required for a ceiling or the like
when the directional speaker device is installed, and the construction efficiency is very low.
[0008]
The present invention solves the above-mentioned conventional problems, and provides a
directional speaker device capable of transmitting sound only to a person in a specific area as a
lightweight, inexpensive, and excellent in workability. With the goal.
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[0009]
[Means for Solving the Problems] In order to solve this problem, in the directional speaker device
of the present invention, a reflector horn is made of a sheet of a polymer material such as vinyl
chloride or polyurethane, and a gas such as air is sealed. It is configured to be in the shape of a
spherical shell in which the cross section is an ellipse.
[0010]
According to this configuration, the weight of the reflector horn is greatly reduced, and it is
possible to eliminate the reinforcement work such as the ceiling at the time of installation.
In addition, if the gas inside the reflector horn is removed at the time of transportation etc., it is
possible to fold it into a small size, and it becomes a directional speaker device excellent in
portability and packaging.
[0011]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of a directional speaker device according to an embodiment of the
present invention.
[0012]
In FIG. 1, 11 is a reflector horn formed of a sheet of polymer material such as vinyl chloride or
polyurethane, 12 is a small box containing a speaker, 13 is a wiring cord to the speaker, 14 is a
reflector horn 11 and a small box 12 A fixture 15 for combining the two is a fixture for the entire
directional speaker device, 17 is a suction valve for introducing and removing a gas such as air
into the interior of the reflector horn 11, and 18 is a gas such as air.
[0013]
The operation of the directional speaker device configured as described above will be described
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below.
[0014]
First, a pump etc. is used for the suction valve 17 attached to the reflector horn 11, and air is
enclosed.
As a result, the cross section of the reflector horn 11 becomes an ellipse.
The electric sound signal is applied to the speaker of the small box 12 arranged at the focal point
X1 of this ellipse and the sound wave 16 emitted from the speaker is reflected by the reflector
horn 11 and collected at another focal point X2 Ru. By these operations, if the focal point X2 is
previously set to the position of the listener's ear, it is possible to obtain good attenuation
characteristics at a desired height.
[0015]
As described above, according to the present invention, since a sheet of a polymer material such
as vinyl chloride or polyurethane is sealed with a gas such as air to form a reflector horn whose
cross section becomes an oval, it is lightweight and inexpensive. In addition, it is possible to
realize a directional speaker device extremely excellent in transportability and construction.
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