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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the appearance of
a conventional shoulder type transistor-megaphone, and FIG. 2 is a view showing an example of
its directional polar pattern characteristic, where a is a level or a vertical Indicates a pattern. FIG.
3 is a perspective view showing the external appearance of a loudspeaker according to one
embodiment of the present invention, FIG. 4 is a sectional view thereof, and FIG. 5 is a directional
polar pattern of the loudspeaker shown in FIGS. It is an example of the characteristics, a is J (%, b
shows a vertical polar pattern, and FIG. 6 is a sectional view of a loudspeaker according to
another embodiment of the present invention, and FIG. 1 is an example of its directional polar
pattern characteristics a Indicates water, b indicates vertical polar pattern. FIG. 8 is a view
showing a state of use of a conventional shoulder type transistor megaphone. 2・…−・ドライ
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
such as a 7-Jolter transistor, a megaphone, or a speaker for public address, and it is intended to
improve directivity characteristics.] FIG. 1 is a conventional shoulder transistor -It is a
perspective view which shows the external appearance of a gahon, and the late 5. of a speaker. --The shooting direction of the beam 02 is one direction toward the front. An example of the
directional polar pattern characteristic of such a conventional shoulder type transistor megapong
is as shown in FIG. 2, -2-111 ′ \, where V is d is horizontal and b is γ The purpose of using \ "'"
shoulder type transistor megabon is to display clearly in the short range (5 to 10 (→ approx) V),
and clear loudness to a wide range of surroundings. It is desirable that the horizontal directivity
should be broad.) Therefore, the horizontal directivity is made as broad as possible by changing
the ratio of the longitudinal structure and making the shape of the opening longitudinally longer.
In order to prevent the decrease in frontal output sound pressure in the high frequency band due
to the above, the vertical directional characteristics are sharpened-however, it is possible to see
from the second directional directional polar pattern 7 characteristic example That There is also
a limit, and the frequency rise and the VC side and backward directivity characteristics become
sharper, and in that direction it becomes an enhanced loudness of the bass,-a drop in the average
output sound pressure and the frequency Fl '¥ ft / LD degradation, etc.) 52 'Ll; 3, no loss of
intelligibility. Furthermore, when the gain is increased to prevent the loss of clarity on the side
and the rear, the output sound pressure level in the frontal direction may increase and the output
sound pressure level may increase or decrease. It is an object of the present invention to provide
a loudspeaker system capable of eliminating the need for a wide range of loudspeakers with high
clarity. An embodiment of the present invention will be described with reference to the drawings.
FIG. 3 is an external view of the loudspeaker apparatus according to the present inventionembodiment (FIG. 4: FIG. 4: cross-sectional views 1 and 14 in the figure; 1 is a main body; 2 is a
driver unit of a speaker; The flex horn 3i: i is the first horn 3b is the second horn 3ci-, the third Ith horn 4 and 5 is the row direction of radiation t-. Thus, according to the present invention (or
near the opening of the speaker (third horn 3c) in the back and forth or near Q state, it is
machined in two directions, that is, 4 and 5). In order to make the horizontal directional
characteristics as broad as possible and the vertical directional characteristics as sharp as
4 shows an example of the directional polar pattern characteristic of the present invention,
where d indicates horizontal -1b indicates a polar pattern in the vertical direction. As can be seen
from this characteristic example, the horizontal polar pattern has a side and a side compared to
the prior art. At the rear, it is almost omnidirectional up to high frequencies, and a wide range,
81 ', makes clear mining possible. . . ニー279. -Di N me 6. ・ It can be understood that the '2'
parameter is in a high direction and is in a certain direction (/ causes an offset,-. This is
experimentally determined, because the vicinity of the connection between the second horn 3b
and the third horn 3c is folded, so as to reflect, the direction of its deviation: approximately, the
division of the third horn 3C It was found that the average sound H6 direction 6 of the horn from
the point to the vicinity of the opening (third horn 3c) was matched. Therefore, it is better if the
mean sound path direction 6 is made to substantially coincide with the desired radial direction,
and if this mo-verb line direction 6 is set to about 10 "or so), almost no deviation is observed. It
was found that the 5 ° high-range sound pressure in the direction of the sound path only
increased by -F. FIG. 6 is an example of a cross-sectional view of one embodiment of the present
invention having an average sound path direction of about 100 i ′ as described above, and FIG.
7 is an example of its directional polar pattern characteristic. 2 shows a vertical polar pattern. As
shown in this figure, according to the present invention, the horizontal directivity characteristic
can be broad V, and the vertical directivity characteristic can be sharp, so that the high 1ρ wide
service area of the intelligibility, which is the purpose of the shoulder type transistor /
megaphone It is oTi stop to obtain. In addition, since the radiation in the vertical direction is
extremely small, it is possible to avoid loudness of the high-range output noise pressure in the
frontal direction << for normal use condition V howling <<, and high definition loud sound is
possible etc. , Have many advantages. The actual condition of use of the Ynolder type transistor
glasses / is as shown in FIG. Is higher than the megaphone M. For example, if you receive 1.6 ', rr
and the height of the megaphone, and s (m) then it is% 54 m)): i: The direction of love is about 8
°, otherwise (C mean direction of sound path 6 There is no need to set 6 to 00, and it may be
more desirable to configure it at about 10 °.) In the present embodiment, only the case of the nJolder type transistor and the megaphone has been described, but in general speakers for public
address etc. It is needless to say that the same effect can be obtained, and in the present
embodiment, although the example using the reflex horn has been described, the same applies to
the case using the straight horn)
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