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JPS5446031

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DESCRIPTION JPS5446031
1. Name of the invention Speaker system (11 speaker having a horn portion through which a
plane wave is propagated and a sectional horn portion through which a cylindrical wave
continuously formed on the horn portion is propagated The speaker system characterized by
having improved. (2) A speaker comprising a horn portion through which a plane wave is
propagated and a sectoral horn portion continuously formed on the horn portion and through
which a cylindrical wave is propagated, the acoustic center of the speaker being the acoustic
center of the woofer A speaker system characterized in that they are arranged substantially in
the same plane.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system, and more particularly to a combination of a cylindrical horn and a sectoral horn (a horn
loudspeaker system according to the second aspect). The horn speaker can be roughly divided
into a cylindrical horn speaker and a sectional horn horn, and while the former is easy to
manufacture, it has poor directivity characteristics and is near the opening at low frequencies
near the cutoff frequency. In the high frequency band, there is a disadvantage that the acoustic
center moves near the horn throat. In the latter, the directivity is constant over the entire
reproduction frequency band, and a wave front is forcibly formed inside the horn, and a
cylindrical wave is emitted. Therefore, the acoustic center is constant at the central part of the
opening angle and the localization is achieved. (Although they have the advantage of having two
advantages, etc., when the horn speaker is attached to the baffle plate, the acoustic center is
located far back from the baffle plate, so attaching a bass speaker to this baffle plate Since the
sound center is in a plane b near the baffle plate, the sound centers of both sound centers will be
deviated and the localization will be lost. Therefore, the present invention takes out only the
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features of both speakers and is excellent In addition to obtaining directivity characteristics,
move the acoustic center to the opening side and near the baffle plate (by providing a sense of
two-tone interest, providing a stable, well-positioned spi EndPage: 1-force Generally, the sound
center of the cone-shaped woofer is a few centimeters deep from the buckle plate, while the
round horn has a frequency band where the sound center moves most to the front face g01 (cutoff frequency f . Also, even in the double frequency band), the acoustic center is located several
centimeters deeper than the baffle plate like the cone-shaped woofer. Therefore, if the acoustic
center of the sectoral horn is positioned at the foremost acoustic center position of the round
horn, a constant sound image can be obtained from low to high. Therefore, according to the
present invention, the sound center of the horn speaker is moved from the throat to the horn
opening by guiding the sound wave as a plane wave halfway, and the part from the middle to the
opening is the circular # wave (Surface wave) The known sectoral horn is converted to a fan
shape directly from the throat, and as shown in FIG. 1, the acoustic center Q is the throat / (two
holes, from this the horn towards the opening) In the state where the fan 2 is fan-shaped and this
is attached to the baffle plate 3, since there is a positional difference between the horn type fan
and the acoustic center Q2 of the fan type, the present invention can It is intended to be moved
to the baffle plate side. The details of the present invention will be described below with
reference to the attached drawings. The wavelength is longer at the cutoff frequency of the horn
compared to the opening of the horn near ?. So horn Without being Jo influences the less,
acoustic center is present near the horn opening, as the frequency increases, the wavelength
acoustic centers affected horn shape Nari shorter will move toward the throat portion.
In other words, in the frequency band ? where the acoustic center moves to the back of the
horn, wavefront control can be easily performed by selecting the horn shape. Therefore, the
sectoral horn section 12 is formed so as to define the winding shape of the horn so as to have the
acoustic center Q at a point within several centimeters of a second on the surface of the baffle //,
A horn section 13 as a plane wave propagation area F is provided continuously to the sectoral
horn section 2 and there is a throat section / hiro at the back of the horn section 13, but a low
frequency sound wave is an aperture / Ja of the horn section 13. In other words, since the
acoustic center originally exists in the continuous lighting of the horn unit 3 and the sectoral
horn unit 12, it substantially coincides with the acoustic center Q of the sectoral horn unit 12. In
this case, assuming that the width dimension in one direction in the conversion region S of the
sectoral horn part / 2 and the horn part / 3 is 2a, the conversion from a plane wave to a
cylindrical wave is smoothly performed at a frequency of about 17000 / a (Hz) or more. Since
the acoustic center moves closer to the throat part / 4 'of the horn part / 3, the width dimension
?a can be increased to increase the use frequency limited to the conversion area S of the horn
part 13 and the sectoral horn part. Is required to be as small as possible, but the cross-sectional
area change 1 of the horn portion 11 is under a constant exponential, and the open side is not
large compared to the throat side, and it is not "C". Therefore, as shown in FIGS. 3 and 4, in the
conversion area S, the width dimension is reduced to the width dimension B, the height
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dimension is set to the height dimension H, and the area is increased to 9 or more. As apparent
from the explanation of (2), according to the speaker system using the horn speaker of the
present invention, the directivity of the sectoral horn is maintained as it is, and the uniformity
within a certain range is also excellent. The center can always be held at a fixed point near the
buckle plate, so it has excellent localization and a so-called forward sound can be obtained. In
addition, it is particularly effective when used together with a woofer on a coplanar buckle plate,
and has an effect that the two acoustic centers are located on a close plane.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan sectional view showing a conventional
speaker system, FIG. 2 is a plan sectional view showing a speaker system according to the
present invention, FIG. 3 is a plan sectional view thereof, and FIG. 3 is a cross-sectional view
taken along W-tV @. / L и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и patent applicants EndPage: 2 land 5 ? y procedure correction book form) day
summoner p, r, November 2, 2nd, 2nd, 2nd, 2nd, Japan Patent Office Commissioner, President,
Yuji Kumagai: 1 display of the case Showa az patent application No. 112864 2 Name of invention
2, Name of invention Speaker system 3, Related patent applicant '' 4 with agent case, agent 5,
Date of correction instruction date November 29, 1952 (shipment) 6, by correction?? ? ? ?
? ? ?? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 2 2 ? ? Japan
Patent Office Secretary Yoshiya Kumagaya 1, the case Display 1987 Patent Application No.
113F164 2, Title 2 of the Invention, Name of the Invention Speaker System 3, Related Person
with Correction Patent Applicants Address (Location) Meguro-ku, Tokyo Meguro 1st Street No.
401 Name (Name ) (501) Pioneer Corporation и 4, agent address ? 160 Tokyo Number of
inventions to be increased by the date Showa Date 6 correction of the date of the correction
instruction. ?
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