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JPS55135587

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DESCRIPTION JPS55135587
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining the type and shape of a
horn, FIG. 2 is a plan view of a conventional radial horn speaker, and FIG. 4 is a horizontal
directional angle frequency characteristic diagram of the same speaker, FIG. 5 is a vertical
directional directional angle frequency characteristic diagram of the same, FIG. 6 is a plan half
sectional view of a horn speaker according to an embodiment of the present invention, 7 is a
cross-sectional view taken along the line B1-B2 of FIG. 6, FIG. 8 is a diagram comparing radiation
resistance frequency characteristics due to differences in horn shape, FIG. 9 is a radiation
resistance when the length of the horn is changed FIG. 10 is a diagram showing a change of the
frequency of radiation resistance of the horn speaker of the present embodiment. 11 иииииии Speaker
unit, 12 иии и и и Bonn, 13 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 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 , 17 и и и и и и и и Horn part, B иии-Ipaboric shape part, C и и и и и и и и и ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Horn
part, B иии-izaboloid shape portion, C иии иии conical shape portion.
The present invention relates to a loudspeaker, particularly to a horn loudspeaker, and the
purpose thereof is to use a horn having a flat sound pressure frequency characteristic and a
small change in directional angle frequency. The horn speaker of Yprompty rice is roughly
classified into three according to the shape of the horn and the way of spreading the horn n710.
This is explained using FIG. 1 showing the way of spreading the horn Then, A indicates an
exponennal-horn, which is represented by the spread of the area of the horn by a finger number
function. B indicates a hyper-pocket horn, which is smaller than the above-mentioned exponential
horn near the spread of the horn or the throat part (population) 1 and is shaped to increase
rapidly near the opening (outlet) 2 It is a thing. C is a conical horn and has a conical horn shape.
Fig.2 and Fig.3 show a concrete rll of the conventional horn speaker. This horn has a hyperpolyk-like spread in the longitudinal cross-section of Fig. 3 but from the second problem As is
apparent, it has a fan-shaped overall shape and is called a radial horn because the sound from
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the speaker is radiated radially. In FIG. 2 and FIG. 3, 3 is a speaker unit, 4 is a horn, 6 is a throat
thereof, and 6I: an i-mouth. The single directional angle frequency characteristics exhibited by
this horn speaker are shown in FIGS. 4 and 6. FIG. 4 shows an 11-degree angle-of-turns number
characteristic determined at a fixed distance from the horn's---ro tree on the center Mq in FIG.
This footing is the angle at which the difference between the sound pressure on the central axis
of the horn and the sound pressure when rotating between the arcs of the horn around the throat
portion 5 of the horn as the rotation center is -6 (dB) Is measured according to the frequency.
This characteristic represents the change in the rate of movement in the direction of the arrow
shown in FIG. 2. This is taken as a horizontal directional characteristic, and one in a plane
perpendicular to this is taken as a vertical directional characteristic. If the vertical plane
directivity angle frequency characteristics are expressed in the same manner as in the
measurement of horizontal plane directivity characteristics, a general tendency as shown in FIG.
6 is shown. As described above, the horizontal directional angle has a small change in directional
angle with respect to the frequency, but the vertical surface directional angle has a wide angle
change with respect to the frequency. The cause seems to be as follows. That is, the operation of
the horn is determined by the high frequency in the shape close to the horn throat, and when the
frequency becomes low, the opening from the throat is 1 ? ? ? 1 ░ ? i = + 1a to 12 -"'" 1 to 5
o 9 j,-one vertical plane, i west facing, the horn opening angle becomes smaller as it approaches
the 5' throat part 5 of the horn as seen in Fig. 3; The directivity angle becomes smaller at the
ugly frequency shown.
On the other hand, the horizontal directional angle is the opening angle of the horn throat late
until the clear with warm water and so on-even if the frequency is thirsty, as shown in Fig. 4, its
internal angle There is almost no change. The present invention solves such conventional
problems, and aims to provide a speaker having a flat sound pressure characteristics and having
a horn with a small change in directional angular frequency. An embodiment of "Koman & 4 tea"
will be described with reference to Fig. 6 and subsequent figures. Fig. 6 is the semi-control 70
figure of the speaker of this embodiment 91 и (C +-02 line in Fig. 7 section 1), and Fig. 7 is B +-11
$ 2 ward section in Fig. 6: 11 is a speaker unit, 12 is a horn, 13 is a throat 9.1a is an opening,
and 16 is a partition plate. In this horn, two rassy slit horn products 16.17 are formed on the
upper and lower sides of the seal sheet 1 plate 15 of the horn, and these horns are combined and
arranged in parallel. The next step is to make the production at Noe 6e4 M1 fl-1. Two horns 16
to 17-their throws) m 131! ll or high-hafric horn shape B, and the opening t $ 149111 is a
conical shape 6 horn shape C. Comparing the characteristics of these two horns, и и и Ipbur IJ
Tsukuho / shape is not fm-oriented but radiation resistance is large up to low range, conical horn
shape is good directivity but radiation resistance is low range Significantly diminishing features
are wandering. Therefore we make throat part 13 ? ? into high public horn shape. If the
opening 14 is formed into a conical horn shape and the two horn-shaped coupling claws are
appropriately fitted, the radiation resistance can be reduced in the area and the directivity can be
elongated. FIG. 8 shows the change of the low range radiation resistance due to the difference in
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the horn shape. FIG. 8 is a change curve of the radiation resistance of the curve (() + 'x-. The song
title (R) is the same throat part as the above song it's part, a part of the melodies, a part of the
melodies of the horn, a mesial twist of the conical horn, and 1 global radiation resistance
compared to the high public horn / It has fallen into fire. The same throat diameter as curve (c)
(1 above curve (b)), diameter of ho / arrows ftp. The horn length tP? + characteristic curve of
the horn of the loudspeaker of the present embodiment in which the vicinity of the throat node is
in the high public shape and the vicinity of the opening portion waits for the conical shape in the
present embodiment. As shown in (c) in Fig. 8, the horns in the lower part of the radiation
resistance are large. It is not practical.
Then, the change of the radiation resistance when changing the length of the horn having the
characteristic as shown in FIG. 8 (c) or the length at the opening 1 from the throat is as shown in
FIG. In the curve of FIG. 9) to 2), the horn length is the longest in 2), and the horn length
becomes shorter in the order of (E) and (H). As such, when the horn having the characteristic of
FIG. 8 (C) is slightly changed in length from the throat to the opening, the frequency of the peak
of the radiation resistance is reduced. Among these horns, the horn of the characteristic of
(country, (to)) of FIG. 9 is shown as the horn @ 1st 17 of FIG. They are juxtaposed in the bowl 1
and the throats 131ii (more when driven, both horns 1), the characteristics of the 16 (in FIG. 9),
(e)) the valleys of the horns or the other are appropriately canceled each other, the throat The
radiation resistance seen from the part 13 is improved to be as flat as m10. The special order in
FIG. 9 is an example in which the frequency at which the valleys of radiation resistance are
generated by shaking the horn length is shifted, and this embodiment uses this, but the horn
opening (horn open foot), that is, the horn The same effect can be obtained by gradually
changing the cutoff frequency. In other words, if you want to shift the peak of the radiation
resistance characteristics ? ? How to change the horn length, ? ? Opening () 4 ? fc rare
constant) m (7, ? fc fc; cut off station change number C, speed of sound) How to change it.
{Circle over (2)} There is a method of simultaneously performing the above {circle around (2)}
methods, and it is possible to reconstruct a horn speaker as in the JM example by any method
using this method. As described above, according to the speaker according to the present
invention, the following effects can be obtained. \, (1) Pointing angle, reciprocity number, andlow range of pointing angle widens--2). ????????????????
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