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JPH0541292

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DESCRIPTION JPH0541292
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
omnidirectional speaker, and more particularly to an omnidirectional speaker excellent in low
frequency reproduction, capable of withstanding large inputs and excellent in characteristics at
height position. .
[0002]
2. Description of the Related Art Conventionally, as a nondirectional speaker in which a speaker
unit is attached to a cylindrical casing, as shown in FIG. 7, a large number of speaker units 92 are
provided on the circumferential side surface of a cylindrical casing 91. And a speaker unit 102
for low-frequency sound attached to the top plate portion of the cylindrical casing 101 upside
down and a radial horn speaker 104 mounted on the upper portion thereof, as shown in FIG.
[0003]
However, in the former case, since a large number of speaker units 92 are disposed, the sound
source is multi-sound source, and there is a drawback that localization is not determined when
listening at a short distance.
Also, in the latter case, since the magnetic circuit unit 103 of the low-pitched speaker unit 102
functions as an equalizer in the radial horn speaker 104, the directivity is good only in the
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horizontal direction but considerably deteriorated in the vertical direction. There is a drawback
that can not be balanced. Furthermore, since the magnetic circuit unit 103 of the bass speaker
unit 102 occupies a considerably large position as a sound wave radiation resistor, there are
disadvantages such as a reduction in sound pressure level and disturbance of high frequency
characteristics.
[0004]
We arrange the speaker units to face each other and connect the respective drive units in series
or in parallel to drive the same phase to generate compression waves of air, thereby making the
sound waves in the circumferential direction of the diaphragm In order to solve the drawbacks of
the non-directional speakers shown in FIGS. 7 and 8 described above, the non-directional speaker
system has been proposed in the prior art (Japanese Patent Laid-Open No. Another
omnidirectional speaker as shown in FIG. 6 has been proposed (Japanese Patent Application No.
3-238957). In the nondirectional speaker shown in FIG. 6, a high sound speaker unit 41 having a
dome diaphragm mounted coaxially with the low sound speaker unit 2 mounted upward on the
upper opening 81 of the cylindrical housing 8 is disposed, The high sound speaker unit 41 is
provided with a holding case 41 a having a curved surface whose surface extends outward from
the dome diaphragm, and the same curved surface as the curved surface of the holding case 41 a
is opposed to the dome vibration plate 41. The diffuser 31 is disposed, and the curved surface of
the holding case 41 a and the curved surface of the diffuser 31 form a horn shape. In the figure,
7 is a duct, D is a dividing network, D1 is a terminal, and K is a sound absorbing material.
[0005]
In the loudspeaker of this structure, the high sound radiation portion constituted by the high
sound speaker unit 41 and the diffuser 31 has a horn shape formed by the holding housing 41 a
and the diffuser 31 so that the reflected sound is synthesized. The apex of the dome diaphragm
of the speaker unit 41 can be regarded as a point sound source with doubled power, and a short
horn opening propagates a spherical wave to a horizontal plane of 360 ° and a vertical plane to
the horn opening angle direction It has the merit of making
[0006]
On the other hand, in the loudspeaker system shown in FIG. 6, the bass loudspeaker unit I2 to be
used can only use one having a size of up to about 16 cm in theory, such as the reproduction
limit frequency in the high region and the directivity characteristic. Therefore, it is not possible to
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create one that can withstand large input signals.
Moreover, in order to lower the lower limit frequency, it is necessary to increase the internal
volume of the cabinet 8, but if the cabinet 8 is made thicker, the diameter of the mounting
surface of the bass speaker unit becomes larger and the diffraction effect is increased. If the
height of the cabinet 8 is increased, the position of the speaker unit 1 increases with respect to
the position of the listener's ear and good characteristics can not be obtained. From that, there is
an application limitation.
[0007]
The object of the present invention is to solve the above-mentioned drawbacks of the
conventional nondirectional speaker and to be excellent in the reproduction of the low frequency
region, to withstand a large input, and to have a characteristic excellent and elegant appearance.
It is in providing a directional speaker.
[0008]
SUMMARY OF THE INVENTION In the omnidirectional speaker according to the present
invention, two diffusers are mounted on the front of the diaphragm so that the diffusers are
coaxially attached to each other. They are disposed to face each other.
Then, a high sound speaker unit having a casing with a substantially elliptical vertical cross
section is disposed opposite to each other at the tip of each of the opposing diffusers, or the high
sound speaker unit is disposed at the tip of one of the diffusers. The reflector of the same shape
as that of the high sound speaker unit is attached to the tip of the other diffuser, and the high
sound speaker unit housing and the high sound speaker unit housing and reflector And the
housing surface or the housing surface and the reflector surface form a horn or a diffuser. The
opposing low-pitched speaker units do not have to have the same aperture, but may be different.
The cabinet for oppositely mounting the bass speaker unit is configured in a substantially "C"
shape in vertical cross section so that both openings of the cylindrical casing are opposed, and
the bass speaker unit is provided at both openings. Attach each one. As a result, the internal
volume of the cabinet can be increased, and the height position of the speaker unit can be set to
an appropriate position. A duct or partition plate may be provided inside the cabinet body, and
the diameters of the cylindrical casings constituting the cabinet may be different between the
upper side and the lower side.
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[0009]
A diffuser is coaxially mounted on the front of the diaphragm in the bass speaker unit, and the
two bass speaker units are disposed to face each other so that the diffuser faces each other. The
bass is mainly radiated 360 ° horizontally. Further, since the low-pitched speaker units are
opposed to each other, it is possible to endure a large input. The housings of the two high sound
speaker units at the tip of the diffuser or the high sound speaker unit and the housing of the high
sound speaker units face each other, so that a horn or diffuser is formed on the both housing
surfaces or the housing surface and the reflector surface The formed and reproduced treble
mainly radiates sound waves in the horizontal direction of 360 °. Since the low frequency
speaker unit is oppositely attached to the opening of the cabinet having a vertical cross section
having a substantially "C" shape, the internal volume is large without raising the mounting
position of the speaker unit relative to the position of the listener's ear Because the mounting
area is small, the influence of diffraction is extremely small, and the spherical wave propagates
without being blocked by the cabinet. In addition, since the sound source axes of the bass
speaker unit and the treble speaker unit are the same and the sound source center is near, the
speaker system has a good balance of horizontal directivity. Since the cabinet is configured in a
substantially "C" shape in a longitudinal cross section, it has an elegant appearance that is
completely different from the shape of a conventional speaker.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A nondirectional speaker according
to the present invention will be described with reference to FIGS. 1 is a perspective view of the
nondirectional speaker according to the present invention, FIG. 2 is a longitudinal sectional view
of the nondirectional speaker in FIG. 1, FIG. 3 is a perspective view showing an example in which
a duct is provided inside the cabinet body, FIG. FIG. 5 is a front view showing an example in
which the diameter of the cabinet is made different between the upper portion and the lower
portion. In the figure, S is a nondirectional speaker, and the two bass speaker units 1 coaxially
attached with the diffuser 3 so as to be located in front of the diaphragm 2 are opposed to each
other so that the two diffusers face each other. In addition, the cabinet 5 is formed in a
substantially "C" shape in longitudinal cross section so that the two openings 51, 51 of the
cylindrical casing are opposed to each other. The bass speaker units 1 and 1 are attached
respectively.
[0011]
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In FIGS. 1 and 2, a high sound speaker unit 4 having a dome diaphragm 4a and a casing 4b
having a substantially elliptical cross section is attached to the front side of each diffuser 3 so as
to face each other. A horn is formed by the bodies 4b and 4b. The cabinet 5 is configured to have
a substantially C-shaped cross section by combining cylindrical members having a substantially
U-shaped longitudinal cross section, but combining the cylindrical members having a
substantially U-shaped longitudinal cross section from above and below It may be C-shaped or, if
possible, integrally formed in a longitudinal section "C". Moreover, the cross-sectional shape of
the cabinet 5 does not have to be circular. A sound absorbing material K is disposed inside the
cabinet 5 as necessary, and the wiring from the bass speaker unit 1 is connected to the terminal
D1 via the dividing network D. Reference numeral 54 denotes a leg of the cabinet 5.
[0012]
In FIG. 3, the high sound speaker unit 4 is disposed on the front side of one of the diffusers 3 and
the reflector 13 having the same shape as the housing 4b is disposed on the front side of the
other diffuser 3 to achieve high In the single drive system, a duct 6 for buffless is provided inside
the cabinet 5.
[0013]
FIG. 4 shows an embodiment in the case of using bass speakers 11 and 12 of different diameters,
and a partition plate 7 is provided inside the cabinet 5 to make the volume according to each
speaker unit and to obtain both basses. Interference of sound inside the cabinet of the speakers
11 and 12 is prevented, and generation of distortion is prevented.
Further, in the configuration example of FIG. 4, it is possible to reproduce only a medium sound
on the small diameter speaker 11 for a small diameter and reproduce a wide frequency band as a
3-way speaker system.
[0014]
4 shows the upper "U" -shaped tube member 54 and the lower "U" shaped part of the cabinet 5 to
correspond to the use of the bass speakers 11 and 12 having different diameters. The inner
diameters of the tubular members 55 are made different. As described above, the combination
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relationship between the bass speaker unit and the cabinet 5 can be freely set, and can be
selected in accordance with the design purpose.
[0015]
With the above construction, the bass reproduced by the bass speaker unit 1 is mainly radiated
in the horizontal direction by 360 ° by the horn formed by the opposing diffuser 3 and both of
the diffuser tip end portions When the housings of the high sound speaker unit or the housing of
the high sound speaker unit and the reflector face each other, a horn is formed on both the
housing surface or the housing surface and the reflector surface, and the reproduced high sound
is Sound waves are emitted mainly in the 360 ° horizontal direction. In addition, since two bass
speaker units 1 are used, it is possible to withstand a large input.
[0016]
According to the omnidirectional speaker of the present invention, since the two bass speaker
units are disposed opposite to each other so that the diffusers face each other, the reproduced
bass is mainly 360. It can radiate in the horizontal direction, and since it is a form which makes
two speakers for bass oppose, low-pass efficiency improvement and input resistance can be
improved. In addition, a horn is formed on both the housing surface or the housing surface and
the reflector surface by opposing housings of the housings of the high-pitched speaker units of
the diffuser tip portion or the housing of the high-sounded speaker unit and the reflector. The
high-pitched sound that has been played can radiate sound waves mainly in the 360 °
horizontal direction. In this way, excellent nondirectionality can be obtained for the low band and
the high band, and the bass speaker unit is oppositely attached to the opening of the cabinet
having a vertical cross section having a "C" shape. A large internal volume can be obtained
without raising the mounting position of the speaker unit relative to the position of the listener's
ear, and the sound source axes of the bass speaker unit and the treble speaker unit are the same,
and the sound source center Because it is near, it can be made a speaker system with a good
balance of horizontal directivity. The cabinet is configured in a substantially "C" shape in a
longitudinal cross section, and can be a speaker system having an elegant appearance that is
completely different from the shape of a conventional speaker. In addition, it is possible to
change the aperture of both low frequency speaker units and change the frequency
characteristics etc., so it is possible to create a speaker system that reproduces a wider frequency
band.
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