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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a radial horn of a
conventional horn speaker, and FIG. 2 is 00 of the same horn speaker. Sound pressure frequency
characteristics at 30 ° and 45 °, Fig. 3 is a model of the radial horn, Fig. 4 is a directional
characteristic at the time of changing the sound pressure distribution at the radial horn opening,
Fig. 5 is Fig. 4 A, b. FIG. 6 shows the sound pressure distribution of the radial horn C, FIG. 6 is a
partially cutaway perspective view of the horn of the horn speaker in one embodiment of the
present invention, and FIG. 7 is the radiation resistance of each small horn of the horn FIG. 8 is a
sound pressure frequency characteristic diagram at 00, 30 ° and 45 ° of the horn speaker of
the present invention. 1.2, 3 · · · · · · · · · · · · · · · · · · · · · · · Small horn, A, B · · · · · · · · · · · Partition
plate. Fig. 7 Fig. 8
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker
having a radial horn in which the opening shape of the horn is arc-shaped, and to provide a horn
speaker in which no valley occurs in the on-axis sound pressure frequency characteristic. Figure
1 shows a conventional radial horn! The opening shape of the horn is arc-shaped. FIG. 2 shows
sound pressure directivity characteristics of a horn-speaker equipped with the radial horn shown
in FIG. In the conventional horns, as shown in FIG. 2, with the conventional horns, 1-199-2 bee,
there is a frequency .about. Where the on-axis sound pressure of 00 becomes a valley compared
to And This nine point is due to the shape of the opening of the horn, and
as shown in FIG. It is known that the directional characteristics calculated assuming that there is
P2... Pi and the actual measurement results of FIG. 2 almost coincide with each other. Therefore,
in order to improve this directivity, it is considered as one means to change the sound pressure
distribution or phase at the horn opening. The present invention attempts to eliminate the
occurrence of valleys near f1 by changing the sound pressure distribution at the horn opening.
When the intensity of the sound pressure of each point sound source is changed in the model
shown in FIG. 3 and the directivity characteristics in are calculated and shown in polar
coordinates, it becomes as shown in FIG. The sound pressure distributions of the characteristics
a, b and c in FIG. 4 are a in FIG. b、Cのようになっている。 a is a sound pressure distribution of
the conventional horn, and the sound pressure of the on-axis O 0 is a valley compared to 30 °
and 45 °. This tendency is more pronounced as shown in FIG. 4 when the sound pressure in the
vicinity is higher than the center of the horn as shown in FIG. Therefore, as shown in FIG. 5C, the
sound pressure distribution is such that the sound use at the periphery of the horn becomes
weak. N is such that the on-axis valley disappears as shown in FIG. 4C. As shown in FIG. 6,
according to the present invention, partitions A and B are provided vertically in the radial horn
when the longitudinal direction is horizontal as viewed from the opening of the radial horn, and
the partitions A and B Is divided into small horns 1 ° 2.3. In this small horn 1.2.3, both of the
cut-off frequencies of the surrounding 1.3 small horns f. , And the cutoff cylindrical wave number
of the center 2 horn is' c2. At this time, the radiation resistances of the small horn of 1.3 and the
small horn of 2 are as shown in FIG. 7, and in the band near frequency 11 of FIG. There is a
valley in the radiation resistance, and the small horn of -2 becomes flat like B. As a result, the
sound pressure distribution at the horn opening near the frequency f is near the center (D2 (7) /
J '*-7), and there is no problem because it is flat. Since the resistance to the valley is a valley, the
sound pressure at the periphery decreases.
Therefore, the directivity characteristics can be improved as the result of C in FIG. FIG. 8 shows
the sound pressure directivity characteristic of the horn speaker of the present invention, and the
valley of the on-axis sound pressure in ~ which has been a problem in the conventional horn
speaker is eliminated, and a flat sound pressure characteristic can be realized. . Further, the
valleys of the radiation resistances of the small horns 1 and 3 become valleys only in the vicinity
of the frequency f1 where the directivity characteristic is a problem, but since they are almost
flat in the other bands, the directivity characteristics are not deteriorated in other bands. The
above embodiment is an example in which two partition plates are used, but the number of
partition plates is further increased, and the radiation resistance of the small horn is further
changed to a smaller value to make the sound pressure distribution of the horn opening more It
is also possible to realize more flat sound pressure characteristics as an ideal one.
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