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JPS54181920

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DESCRIPTION JPS54181920
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b show a conventional horn speaker, FIG.
2 shows a directional frequency characteristic of the horn speaker shown in FIG. 1, and FIGS. 3a
and 3b show the same. FIG. 4 shows an embodiment of a horn speaker according to the
invention, FIG. 4 shows a directional frequency characteristic of the horn speaker shown in FIG.
3, and FIGS. 5a and b to 7a and 7b show other embodiments according to the invention. FIGS. 8A
to 8C show examples of the present invention and are diagrams showing various shapes of the
sound absorbing material as viewed from the front. 1 · · · · · · · · · · · · · · · · · · · · · · · In the drawings,
the same reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker
having improved directivity in the high band portion. In general, the aperture diameter of the
horn speaker having a circular cross section, the aperture diameter of 1-4-/ and // the surface of
the mouse (mouse) is larger than the aperture diameter of a direct emission type loudspeaker
having the same upper limit of the reproduction frequency band. For this reason, the
deterioration of directivity in the high region is large, and O (Fig. 1 and?), Which is one of the
disadvantages of horn speakers, is a diagram showing a conventional horn speaker, and (a) is a
front view (B) It is the AA 'line sectional view in Fi (a) figure. In FIG. 1 (a) and Φ), 1 indicates a
horn and 2 indicates a driver unit. FIG. 2 is a directional frequency characteristic diagram of the
conventional horn speaker shown in FIG. 1 (荀 and)), on the axis 0) at θ °. The sound pressure
in the directions of 30 ° and 60 ° is grouted. ・ As can be seen from this Fig. 2, the
conventional horn speaker has remarkable deterioration of directivity as it becomes higher, and
the sound quality is changed to bad. The upper limit of the playback frequency band of the
speaker is to be limited. Therefore, conventionally, it has been considered to improve by using an
acoustic lens, a diffuser or one or two multicellular etc. However, with such a method, the
configuration becomes relatively complicated and expensive. The present invention has been
made in view of the above circumstances, and it is an object of the present invention to provide a
03-05-2019
1
horn speaker in which the directivity in the high region is improved with a relatively simple and
inexpensive configuration. An embodiment of the present invention will be described below with
reference to FIGS. 3 to 8. FIG. 3 (荀 and 有) is a view showing an embodiment of the horn speaker
according to the present invention, and (荀 is a front view, a construction) is a cross-sectional
view taken along the line B-B in FIG. In FIGS. 3 (a) and 3 (b), 1 is a horn, 2 is a driver unit, and 3
is a sound absorbing material mounted on the inner peripheral surface of the horn 1 in the
vicinity of the mouse. In this case, the sound absorbing material 3 has a sound absorbing
characteristic in the high region of the speaker reproduction frequency band. As described above,
if the sound absorbing material 3 is attached to the inner peripheral surface in the vicinity of the
mouse of the horn 1 The apparent diameter of the opening can be made smaller and smaller.
That is, compared to the conventional horn speaker shown in FIG. 1 without such a sound
absorbing material 3, the curvature of the wave front of the mouse can be made smaller and the
deterioration of directivity can be reduced. FIG. 4 is a directional frequency characteristic
diagram of the horn speaker according to the present invention shown in FIG. 3, compared to the
directional frequency characteristic of the conventional horn speaker shown in FIG. It can be
seen that the degree of the degree decreases but there is no relative level decrease in the
directions of 30 ° and 60 °, and the directivity in the high region is improved.
FIGS. 5 to 7 show other embodiments of the present invention, respectively, which show the
cross-sectional shape of the sound absorbing material 3 attached to the horn l. In each of the
drawings, (a) is a front view, and (6) is a sectional view taken along the line C-C 'in the overhead
view. 8 (a) or C) is a view showing various shapes of the sound absorbing material 3 as viewed
from the front, and FIG. 8 (a) is an annular one shown in FIG. 3 and FIG. (C) shows a ring-shaped
one having an inner peripheral surface appropriately protruded. As described above, according
to this invention, the conventional acoustic lens and diffuser in which the sound absorbing
material 3 having the sound absorbing characteristic is projected to the inner peripheral surface
near the horn mouse in the high frequency portion of the horn speaker reproduction frequency
band. It is possible to improve the directivity in the high region with a simple and inexpensive
configuration as compared with the case of using the etc., and its practical effect is great.
03-05-2019
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