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JPS631198

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DESCRIPTION JPS631198
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker horn incorporated into an
electroacoustic transducer. (Prior Art) There is a Defrakunyon type horn which utilizes all of the
diffraction effect for the purpose of widening the directivity characteristic in the reproduction
band, and further, there is a Sitapai radial twin vessel horn or the like with a constant sound
pressure characteristic pattern in the directivity site. (Problems to be Solved by the Invention)
The shape of the openings of these horns is that the shape of the pair of opposing open ends is a
circular arc, and when attached to a flat baffle, the central part protrudes from the baffle surface
The disturbance of peaks and valleys occurs in the sound pressure frequency characteristics
depending on the size, and the central part protrudes more as the directivity angle is made wider,
and the disturbance of the characteristics becomes remarkable. Therefore, it is an object to
obtain a wide pointing angle and further to flatten sound pressure frequency characteristics.
(Means for solving the problem) The sound pressure pattern in the pointing station is constant at
the vertical pointing angle (QV) from the target vertical pointing angle (QV) and horizontal
pointing angle (QM) (however, QQ). Determine the tangent angle Qv as the sidewall function ax =
ao (1 + αx) 'and the expansion coefficient α with 2Q7 as the tangent angle of the open end,
provided that the sidewall curve assumes 頒 ° if 2QY exceeds 頒 °) Do. The horizontal pointing
angle (QHI) can be determined by making it a gap in the side wall that controls it. Here, flI is the
upper limit frequency to obtain the target pointing angle, C is the speed of sound, and K is a
constant that determines pointing. Sound pressure point of 1 6 db). For this reason, if the
distance d between the side walls is set to a high frequency reproduction limit frequency fH high,
a very narrow pitch occurs, and a sharp change in acoustic impedance occurs at the opening end.
In particular, when the parallel open ends that determine the horizontal pointing angle (QH) are
formed by a plane connecting two side wall open ends determined by the vertical pointing angle
(Q-), the effect is remarkable and steep in the reproduction band Sound pressure valleys occur.
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This is for the same reason as the air column resonance of the tube. As a means to prevent these,
the curve β connecting the open ends on both sides determined by the vertical transmit angle
(QV) of the open end which determines the horizontal directional angle (QH) is changed from the
name of the distance from the diaphragm to the open end. This problem can be solved by setting
the opening surface corresponding to the throat to be less than 0.15 J. Furthermore, in order to
make the sound pressure pattern in the horizontal directional angle (Q yo) station constant, the
same method as when setting the vertical directional angle achieves both systems determined by
the vertical directional angle (QV) from the curve β. However, in order to make the sound
pressure pattern in the horizontal pointing station constant, it is necessary to set the pointing
angle determined by the distance dK between the side walls to a larger value in advance.
By setting the curve β in the claim range, changing the frequency characteristic of the high band
starting to decrease the horn load and changing the directivity characteristic is proportional, and
the sound pressure characteristic is attenuated linearly by 6 dB10 c1 t on the logarithmic scale
to the high band This slope can realize flat frequency characteristics with simple correction by
the network filter. The sound pressure frequency characteristics are flattened even if the horn
determined in this manner is attached to the buckle surface, and good directional sound pressure
characteristics can be obtained with a side wall shape that obtains a wide directional angle.
(Embodiment) FIG. 1 is a perspective view of a horn according to the present invention, FIG. 2 is
a front view of the horn 1 and FIG. 3 is a sectional view of a pair of side walls 2a and 2b for
determining a vertical pointing angle (QV). The trajectory curve β of the point C of the slit (d)
due to the side walls 2c, 2d of the substantially parallel plane which determines the horizontal
pointing angle (QH) which is a feature of the present invention is shown. FIG. 4 shows the shape
of the side wall of the pair of side walls 3a and 3b which determines the horizontal horizontal
projection angle (QH) cut by the plane including the center of the horn of the horn. 1111 wall 2a
which determines the vertical pointing angle (QV) at this time. Side curve of 2b is a! Let any
tangent angle as a function of == a 6 (1 + α x) 4 be a spread coefficient α with 2 Qv being the
tangent angle of the Qv opening end. The distance d between the substantially parallel side walls
2c and 2d for determining the horizontal pointing angle (QH) is d = 2.5− and the pointing angle
is ω °. The curve β is a Gaussian curve represented by x = a-T 1-x (a 2) with reference to the
aperture surface, a knee μ. The polar coordinate characteristic pattern in the horizontal
direction obtained by this is shown in FIG. 5 and the directional characteristics of oo, () and ω °
in the horizontal direction are shown in FIG. 6; directional characteristics of 0 °, 30 ′ ′, 60 ′
in the vertical direction Is shown in FIG. FIG. 8 shows a perspective view of the appearance of a
general day fraction type horn, the vertical side wall curve thereof is shown in FIG. 9, and the
horizontal side wall curve is shown in FIG. At this time, the horizontal directional characteristics
when attached to a baffle on a flat plane are vertical to FIG. 11 with the side wall curved line
horizontal direction distance d between the side walls being the same condition as shown in FIG.
1 to FIG. The directional characteristics of the direction are shown in FIG. Comparing these two
measurement data-General defraction type horn has a large peak and valley in the sound
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pressure characteristic, and the influence of diffraction and reflection by the part coming out of
the mounting surface is seen, and the directivity pattern also has its characteristic pattern as the
on-axis characteristic. It will change greatly. Figure 13 shows the directional pattern in the
horizontal direction when the open end of the horn is a plane, and the other conditions are the
same as in Figures 1 to 3 and 8, and Figure 16 is the directional pattern in the vertical direction.
It is shown in Fig.17.
In this case, although the disturbance due to the peaks and valleys of the sound pressure
characteristics as shown in FIG. 11 and the directional characteristics also have little change due
to the angle of the pattern, a large valley is generated in the reproduction band. From the above,
the speaker horn according to the conditions of the present invention can supply a wide
directivity angle with a smooth frequency characteristic similar to the on-axis sound pressure
characteristic pattern. Also, it is conceivable that the trajectory of the curve β is a curve change
as a function of ax = a, (1 + αX) H from any center line of hyperbola, arc, combination of arcs or
horn. These options can change the characteristics from the frequency at which the reduction of
the horn load starts. As a representative example, FIG. 18 shows the appearance of the case
where the curve β is a circular arc, FIG. 19 shows its characteristics, and the appearance of the
curve β is ax = ao (1 + α) 1. FIG. 21 shows the characteristic, and FIG. N shows the
characteristic of the appearance when the curve β is == ao (t + α) 4 in FIG. In the characteristics
shown in FIGS. 19, 21 and n, a smooth attenuation characteristic without large valleys in the
directivity characteristic can be obtained. (Effects of the Invention) The speaker horn according
to the present invention can obtain a wide directional angle, and can supply a smooth sound
pressure frequency characteristic.
[0002]
Brief description of the drawings
[0003]
1 is a perspective view showing the present invention, FIG. 2 is a front view thereof, FIG. 3 is a
sectional view showing a side wall curve in the vertical direction, FIG. 4 is a sectional view
passing through a horizontal center point, FIG. Shows its polar coordinate directional
characteristics, FIG. 6 shows its horizontal directional characteristics, and FIG. 7 shows its
vertical directional characteristics.
Fig. 8 is an external view showing a general day fraction type horn, Fig. 9 is a sectional view
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showing a side wall in the vertical direction, Fig. 10 is a sectional view showing a side wall curve
in the horizontal direction, and Fig. 11 is a horizontal direction. The directional characteristics,
FIG. 12 shows the directional characteristics in the vertical direction, FIG. 13 is an external view
of the horn for detailed explanation of the present invention, FIG. 14 is a sectional view showing
side wall curves in the vertical direction, and FIG. FIG. 16 shows the directional characteristic in
the horizontal direction, and FIG. 17 shows the directional characteristic in the vertical direction.
18, FIG. 18 and FIG. N are external views showing application examples, and FIG. 19, FIG. 21 and
FIG. N show respective directivity characteristics. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · horn 口 方式 (方式 式) 17 April 17, 1987 昭和 Patent Application No. 143834 2
Title of Invention Title for Speaker-3 '? Relationship with applicants who make In case Patent
applicant address Zip code 107 Akasaka 4-14-14 Akasaka Minato-ku name +4161 Nippon
Columbia Co., Ltd. Representative director 57 May Irro 4 agent address Zip code 210 For
Kanagawa Prefecture 5-6, Minato-cho, Yoshizaki-ku, Saki-shi August 26, 1986 (shipping port) 6
Target of correction
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