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JPH05199583

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DESCRIPTION JPH05199583
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
directional speaker device used as a facility for broadcasting 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 even at public addresses, a desire to transmit only to a specific
range or to a specific person is being realized specifically It is a situation. In addition, in order to
further enhance the directivity effect, a method is also used in which a spotlight is used in
combination and illumination is applied only to a portion directly below the directional speaker
device.
[0003]
Hereinafter, a conventional directional speaker device will be described. FIG. 2 is a plan view of a
conventional directional speaker device, and FIG. 3 is a cross-sectional view showing its F-G-H-I-J
cross-section in which the spotlight is used in combination.
[0004]
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In FIG. 2 and FIG. 3, 1 is a spherical shell reflector horn for reflecting sound. A small box 2 stores
a speaker and generates a sound. 3 is a wiring cord to the speaker, 4 is a fitting for attaching the
small box 2, and 5 is a hanging fitting for the whole directional speaker device. A spotlight 7 is
mounted on a wall or a ceiling for illuminating directly below the directional speaker device.
[0005]
The operation of the directional speaker device in which the spotlight illumination configured as
described above is performed from another place will be described below.
[0006]
First, the electric signal of sound is applied to the speaker in the small box 2 containing the
speaker through the wiring cord to generate sound.
Since the opening of the speaker is provided to face the reflector horn 1, the generated sound is
emitted from the small box 2 and reflected by the reflector horn 1 as shown by the broken line 6
in FIG. 3.
[0007]
The curved surface curve of the reflector horn 1 is formed by an ellipsoid, and the speaker of the
small box 2 as a sound source is disposed at one of the two focal points of the ellipse, and the
listener near X2 at the other focal position. If the configuration is such that the ears of the sound
come from, the sound emitted from the speaker can be collected at the listening point X2, and
although it can be heard under the reflector horn 1, the sound will be attenuated as it goes away
from the X2 position It is possible to tell only to people in the area. In addition, spotlight
illumination is added to the above area from another lighting device in order to enhance the
directivity effect.
[0008]
However, in the above configuration, additional lighting equipment needs to be attached to a
nearby wall or ceiling to add spotlight illumination, but there is no suitable place for it. It had the
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problem that installation work took time and effort.
[0009]
An object of the present invention is to solve the above-mentioned conventional problems, and an
object thereof is to provide a directional speaker device in which spotlight illumination for a
specific area is incorporated in advance and no additional work is required.
[0010]
In order to solve this problem, in the directional speaker device of the present invention, a
separate room is provided at the bottom of the small box containing the speaker, and the
illumination lamp is opposed to the reflector horn in the separate room. It is supposed to be
stored in the
[0011]
According to this configuration, the light beam emitted from the illumination lamp provided in
another room at the bottom of the small box containing the speaker is reflected by the reflector
horn, and it is possible to illuminate the portion directly below the reflector horn.
[0012]
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.
[0013]
In FIG. 1, 11 is a spherical shell-like reflector horn, 12 is a small box containing a speaker and an
illumination lamp 17 at the bottom, 13 is a wiring cord, 14 is a mounting bracket for connecting
the reflector horn 11 and the small box 12, 15 is It is a mounting bracket for mounting the
reflector horn 11.
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17 is a lamp for illumination, 18 is a separate chamber provided at the bottom of the small box
12, 19 is an opening provided on the side of the separate chamber 18, and 20 is a light beam.
[0014]
The operation of the directional speaker device configured as described above will be described
below.
The spherical shell-like reflector horn 11 is formed of an ellipsoid, and the small box 12
containing the speaker is attached such that the speaker is at the focal point X1 of the ellipsoid.
The bottom of the small box 12 is provided with a portion 18 having a separate chamber
structure from the portion accommodating the speaker, and the lighting lamp 17 is incorporated
therein, and an opening for light transmission is provided on the side portion Part 19 is opened
in four places.
[0015]
The light beam 20 emitted from the illumination lamp 17 passes through the four light
transmission openings 19 at the bottom of the small box 12 and strikes the reflector horn 11 and
is reflected to illuminate the portion directly below the reflector horn 11. Since the position of
the lighting lamp 17 is such that the speaker housed in the small box 12 is shifted from the focal
point X1 of the ellipsoid, the light beam emitted from the lighting lamp 17 is focused on the
other focal point X2 of the ellipsoid It is possible to illuminate the portion directly below the
reflector horn 11 without doing so.
[0016]
As described above, according to the present invention, by causing the reflector horn to act as a
reflector for both sound and light, a directional speaker device with spot lighting which does not
require the installation work of lighting equipment as compared with the conventional one. Can
be realized.
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