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JPH0570094

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DESCRIPTION JPH0570094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
reflective nondirectional speaker system in which a reflector is disposed on the front side of a
speaker.
[0002]
2. Description of the Related Art As a nondirectional speaker system generally used
conventionally, as shown in FIG. 5, a reflective type in which a reflector 11 is disposed on the
front side of a speaker (S) As shown in FIG. 6, there is a multi-surface radiation type in which a
large number of speaker units 25 are disposed on the circumferential surface of a cylindrical
casing 24. In the reflection type shown in FIG. 5, the reflector 11 has an arc-shaped recess 11a
annularly formed on the upper surface side of the plate-like main body, and a mountain-shaped
protrusion 11b formed in the central portion thereof. A large number (usually three or more) of
columns 13 are obliquely provided in the upper center direction, and the speakers (S) are
attached downward to these columns 13, and the speaker (S) has a substantially spherical
housing. A body 14 is provided, and the center of the cone diaphragm is disposed to face the
protrusion 11b of the mountain shape.
[0003]
03-05-2019
1
As in the multifaceted nondirectional speaker system shown in FIG. 6, the reflective
nondirectional speaker shown in FIG. 5 is that it does not require a large number of speaker
units. Although the system is advantageous, in the conventional speaker system shown in FIG. 5,
the speaker S is fixedly supported by a large number of columns 13 which are fixedly erected
from the reflector 11, and the reflector 11 is shaped or made of material. There is a drawback
that only a certain sound quality can be obtained, because it can not be replaced with another
one. Further, the sound radiated from the speaker S is irregularly reflected by the large number
of columns 13 so that the sound is easily influenced by the columns. Furthermore, in the
configuration shown in FIG. 5, the housing 14 of the speaker S has a substantially spherical
shape, and the reflector 11 having an annular recess is disposed upward, so a structure in which
dust tends to collect on the reflector 11 And since the reflector 11 is fixed by the support | pillar
13, there exists a fault that cleaning is difficult.
[0004]
The object of the present invention is to eliminate the drawbacks of the conventional reflective
non-directional speaker system as shown in FIG. 5, and to change the sound quality simply by
replacing the reflector and to change the radiation of the sound. An object of the present
invention is to provide a reflection type omnidirectional speaker system which can reduce
disturbance as much as possible and can be easily cleaned.
[0005]
[Means for Solving the Problems] In order to solve this problem, the reflective non-directional
speaker system of the present invention is constructed by erecting at most two columns or less
from the baffle portion of the speaker. The structure supporting the reflector directly above the
speaker unit with the support, and the reflector being detachable from the support, allows
various types of reflectors to be attached depending on the application.
The reflector is provided with a fitting hole into which the support is loosely fitted, so that the
reflector can be disposed simply by mounting on the support. The speaker unit to be disposed is
a dome speaker for tweeter, the baffle portion is formed into an arc-like surface at least on the
front side, and the reflector to be prepared is rotationally symmetric like spherical or conical. It is
assumed that In addition, a spacer is disposed in the fitting hole so that the distance between the
speaker and the reflector can be adjusted, and the distance between the apex of the dome
diaphragm in the speaker and the apex of the reflector can be kept uniform. , The depth of the
mating hole for each reflector to be selected
03-05-2019
2
[0006]
When the reflector is placed, the fitting holes are fitted to the columns erected on the baffle
portion. Reflectors of different shapes and materials are available and can be replaced. The depth
of the fitting hole formed in each reflector is constant, and the distance between the apex of the
dome diaphragm in the speaker and the apex of the reflector is kept uniform regardless of which
reflector is used. Also, a spacer may be inserted into the fitting hole to adjust the height position
of the reflector. In this manner, equalization and sound quality adjustment can be performed by
changing the shape or material of the reflector or changing the distance between the reflector
and the diaphragm. Also, by removing the reflector, it is possible to easily clean the part where
dust is easily accumulated. The baffle section is formed annularly and by attaching the dome
speaker upward, the right and left directional characteristics are close to the front axis
characteristics, and the front side of the baffle section becomes an arc-like surface over the entire
circumference. Because of this, the upper and lower directivity characteristics are also close to
the frontal axis characteristics.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reflective
nondirectional speaker system according to the present invention will be described based on
FIGS. 1 to 3. FIG. In the figure, S indicates the entire speaker, and the speaker unit 5 is a dome
speaker for tweeter use, and the baffle portion 4 is formed in an arc-shaped surface over the
entire front side 4a. Then, two pillars 3 are erected from the baffle portion 4, and the reflector 3
is supported by the pillars 3 directly above the speaker unit 5 so that the reflector 1 can be
detached from the pillars 3. Various types of reflectors are prepared so that they can be replaced
according to the application, as shown in FIG. 3A, a reflector 1a having a perfect circular sphere
shape and an oval spherical egg as shown in FIG. 3B. A reflector 1b of a shape and a reflector 1c
of a soroban ball shape whose front and rear sides are symmetrically conically shaped as shown
in FIG. 3C are prepared. Thus, the reflector 1 is designed to be rotationally symmetrical.
[0008]
These reflectors 1 are provided with fitting holes 2 in which the support 3 is loosely fitted, so
that the reflectors 1 can be arranged simply by mounting them on the support 3. Further, the
spacer 6 is disposed in the fitting hole 2 so that the distance between the speaker S and the
03-05-2019
3
reflector can be adjusted, and the distance between the apex of the dome diaphragm 5a and the
apex of the reflector 1 is made uniform. In order to keep it constant, the depth of the fitting hole
2 of each reflector 1a, 2a, 3a is made constant. Further, in the embodiment, as a material of each
reflector 1a, 2a, 3a, various materials such as synthetic resin, metal, wood etc. I prepared a
material of the same material, replaced it and attached it. In this experiment, it was found that
flat characteristics can be obtained in the horizontal direction with the oval reflector 1b of FIG. 3
(B). Further, in the case of the perfect circular reflector 1a of FIG. 3A, the diffraction phenomenon
is extremely reduced, so that flat characteristics in the horizontal direction and the vertical
direction can be obtained, and it has been found that the sense of spread is improved.
[0009]
In terms of the material of the reflector 1, for example, when a metal reflector 1 made of
aluminum or the like is used, the high sound quality of resolution is obtained because the
reflectance of the sound becomes large, and a reflector made of a synthetic resin is used.
Although the reflectance was lower than that of the above-mentioned metal, the tan δ of the fall
of the sound was increased, and a gentle sound quality was obtained. As described above, the
characteristic surface can be changed by changing the shape of the reflector 1, and the sound
quality such as reflectance and tan δ can be changed by changing the material, so that the
application and environment can be used even without using an electrical equalizer. It is possible
to make a sound that matches the sound, which is advantageous. Furthermore, since it is possible
to use a reflector that is also excellent in design, such as acrylic and glass, it is possible to adopt a
fashion that is full of fashion according to the atmosphere of the room. Further, since the
reflector 1 can be attached and detached, cleaning is easy even when dust is accumulated, and
maintenance of the speaker itself is easy. Fig. 4 shows the directivity characteristics of a 2 Way
system using a perfect spherical reflector 1a, and the directivity characteristics in the vertical and
horizontal directions are displayed with the 10 dB range lowered for easy viewing. As is
apparent, the reflector 1 and the baffle portion 4 have a circumferentially uniform shape, so that
almost the same characteristics can be obtained anywhere at equal distances from the speaker
main body, and the room environment is acoustically somewhat poor. , You can get the spread of
the sound field.
[0010]
According to the reflection-type nondirectional speaker system of the present invention, the
reflector can be easily attached and detached, and by using reflectors of various shapes and
materials in an exchange manner, electrical You can enjoy making a variety of sounds without
using a special equalizer, and you can place a reflector with a design that matches the
atmosphere of the room in the room, and if there is dust, cleaning, maintenance of speakers, etc.
03-05-2019
4
In addition, the sound is radiated in the circumferential direction, and the disturbance of the
sound can be reduced as much as possible to improve the performance of this kind of reflective
nondirectional speaker system. be able to.
03-05-2019
5
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