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JPS57208791

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DESCRIPTION JPS57208791
Description 1, title of the invention
ホーン
3. Detailed Description of the Invention The present invention relates to a horn having improved
directivity. Conventionally, a horn speaker is generally used as a high sound speaker. In this case,
an exponential type horn is generally used. Among them, a circular horn can obtain vertical
characteristics because of its simple shape, but on the other hand, it degrades as the directivity
becomes higher for radiating plane waves. There was a drawback. In order to improve this point,
a radial horn or the like, whose directivity is improved by combining a circular horn and an
acoustic lens, or by changing the shape of the horn, is mainly used. However, in any case, it is
difficult to keep the directivity characteristics in the longitudinal direction and the lateral
direction uniform, so it is only for improving the directivity in the lateral direction that is
important for stereo sound field reproduction and can satisfy the directivity in the longitudinal
direction. There was a slight difference in sound quality when sitting and listening when standing
and listening. Further, when the sound path is forcibly deformed as in a radial horn, the wave
front of the sound is disturbed or a partial resonance is caused to often deteriorate the
characteristics. In addition, in the horn speaker, the radius r of the diaphragm EndPage: 117000!
It is known that good directivity characteristics are exhibited up to a frequency of-(Hz).
Therefore, when the radius of the throat of the horn is rt (an), uniform sound pressure is
distributed in the horn up to the frequency of r + == 17000 <Hz). In this case, as shown in FIG. 1,
the conical cone has a linear spread angle +10 at the throat portion S, so that the sound pressure
is uniformly distributed at a frequency lower than the frequency to which ft. become. This
indicates that the conical horn is more advantageous in directivity characteristics in the high
range as shown in FIG. 2 than the spread angle iae at the throat portion 8 and the narrow
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exponential horn B. However, in the conical horn, the frequency characteristic as a horn is not
good as shown in FIG. 3 regardless of the load in the low-pitch range as in the exponential horn
B. Therefore, Exponential horn B is more advantageous for conical horns than for conical section
change. The present invention has been made in view of the above-described points, and the
object of the present invention is to make a plurality of cores having a substantially spindle
shape inside as horns peculiar to conical horns having a certain spread angle from the throat
portion. By forming in a predetermined shape such as a change in cross-sectional area or a
change in cross-sectional area according to the radial direction of the beam, uniform directional
characteristics can be obtained in a very wide frequency range below Provides a wide band
characteristic as a horn such as exponential or high poll, etc. Furthermore, since it is necessary to
forcibly deform the sound path, there is provided a horn which can obtain a straight
characteristic without causing parasitic resonance and the like. It is to do.
The present invention will be described below with reference to FIGS. 4 to 7. Basically, the horn
body 1 has a conical shape, and a plurality of substantially spindle-shaped cores 1 are distributed
and arranged in the radial direction of the horn body 1 on the inner periphery of the horn body 1
in cross section The change is formed in a predetermined shape, such as an exponential or a high
poll. An embodiment of the present invention is configured as described above, and since the
horn main body 1 is basically formed in a conical shape, any frequency within a range below 9
which is rt specific to the conical horn may be used. Instead, uniform directivity characteristics
are obtained as shown in FIG. Further, by dispersing and arranging a plurality of substantially
spindle-shaped cores on the inner periphery of the horn main body 1 in accordance with the
radiation direction of the horn main body 1, the cross-sectional shape thereof is like an
exponential or high poly horn Since the load is applied in the low frequency range because it is
formed into a predetermined shape, the frequency characteristic is good as shown in FIG. Also,
there is no need to forcibly deform the sound path, especially the throat portion, by forming a
plurality of cores as in the exponential or hippolic horn, without forcibly deforming the sound
path, especially the throat portion. Therefore, parasitic resonance is not generated and a straight
characteristic with elongation is obtained, and the structure is relatively simple and easy to make.
In addition, a plurality of cores and an equalizer (not shown) are formed of a synthetic resin and
glass frame transparent EndPage: 2 birds, and a pilot lamp, an indicator, etc. are provided in
contact with the outside of one core etc. Then, the dark place inside the horn can be illuminated
to exhibit the illumination effect, and the illumination gives a visual three-dimensional effect. The
present invention is based on a conical horn having a certain spread angle from the throat as in
the present invention, and a plurality of cores having a substantially spindle shape inside are
dispersed and arranged in a radial direction of the horn to have a cross-sectional area Since the
change is formed into a predetermined shape such as an exponential or a high poll, uniform
directivity characteristics can be obtained regardless of vertical and horizontal in a very wide
frequency range below the frequency of ft. Further, a wide band characteristic as a horn such as
an exponential or a high poll can be obtained, and furthermore, since it is not necessary to
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forcibly deform the sound path, a parasitic characteristic or the like does not occur and a straight
characteristic can be obtained.
4. Brief description of the drawings Fig. 1 compares the angular spread of the conventional
conical horn and the exponential horn at the throat, and Fig. 2 similarly shows the directional
characteristics in the high range of both. Similarly, FIG. 3 is a characteristic view showing both
frequency characteristics, FIG. 4 is a front view showing an embodiment of the horn of the
present invention, and FIG. 5 is a cross-sectional view taken along the line X-X in FIG. FIG. 6 and
FIG. 6 are distribution diagrams similarly showing directivity characteristics in the high tone
range, and FIG. 7 is a characteristic diagram showing frequency characteristics similarly. 1 · · ·
Horn body, one person ... core. Patent applicant Pioneer Corporation, Inc. EndPage: 3 procedure
correction document width adjustment) Patent office secretary's secretary on December 11,
1957 1) Harukandon 1, display of the case Showa 561 patent application No. 93718 No. 2, name
of invention 2 Name of invention Horn 3 Related person with correction Patent application
address Tokyo Metropolitan Tokyo Meguro-ku M1-4th No. 1 name (501) Pioneer Corporation
Mr. A-4 Agent name (6069) Hideo Shikano 5, Date 1 of correction instruction Date 6, number of
inventions to be increased by correction 121 Fig. 8 Content of correction as per attached sheet
(Japanese Patent Application No. 56-93718) 1, Specification, 1st On page 15 line, "Vertical" is
corrected to "Straight". 2. Correct the description of “to emit” on page 2, line 1 to “because to
emit”. 70003, specification, page 3, lines 1 and 4 of the description of rf-7- (Hz) J are corrected
to ft = 17000 (H ,,). t4, in the specification, page 3, line 6, correct "conical corn" to "conical corn".
5. Correct the description, “While,” on page 3, line 15 to page 4, line “5” in the specification
to “do not take place”. 6 In the specification, page 5, line 7, "Inside" is corrected to "Inside". T,
in the specification, p.5, line 8, correct the statement "to fit" to "to fit using support member 2". 8.
Correct the description of "arranged" on page 8, line 5 to "arranged and supported" in the
specification. 9, the specification, 5 貞 11 lines. “J1” is corrected as follows. Although the
support member 2 needs to support the core 1 firmly, it is desirable that the support member 2
be shaped and structured so as not to interfere with the generation of sound waves. 10,
Specification, page 6, lines 3 to 4 corrects to “4c” “Dispersed and arranged by using the
support member 2” described as “dispersed and arranged”. . 11. Correct the description of
“dispersion, arrangement” on page 1, line 9 in the specification, as “dispersion, arrangement
and support with support wing 2”.
12, correction as shown in Fig. 4 and Fig. 5 separately. Patent Assignee Pioneer Corporation
EndPage: 5 Warning: Page Discontinuity
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