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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
horn speaker, FIG. 2 is a cross-sectional view showing one embodiment of the horn speaker of
the present invention, and FIG. FIG. 4 is a cross-sectional view of an essential part of another
embodiment. 12 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · voice coil, 19 · · · · · · · · 20 internal horn, 21 ...... folded horn, 22 ...... fixed
external horn, 23 ...... rollers, bearings, 24 ...... movable external horn, 25 ... .... Synthetic resin
layer. Fig. 48 l-one circle [* comparison Hz
[Detailed description of the invention], A? The present invention relates to a horn speaker
configured to be able to change sound pressure-frequency characteristics depending on the use
environment. In general, horn speakers are often used as loudspeakers for loudspeakers, but in
order to obtain high clarity, the sound pressure-frequency characteristics required differ
depending on the use environment, that is, the size of the ambient noise and the frequency of the
noise. ing. The conventional horn speaker is configured as shown in FIG. That is, the domeshaped diaphragm 6 is disposed on the field portion 5 formed of the plate 2 provided with the
center pole 1, the ring-shaped magnet 3 and the ring-shaped upper plate 4. A coil 7 is coupled,
and the voice coil 7 is embedded in the magnetic gap 8 of the field section 6. Further, on the
dome-shaped diaphragm 6, an internal horn 9 with a horn throat is disposed. An open horn 1o is
provided on the open end side of the internal cavity 8 · −79 2), and the external horn 11 is
mounted on the field section 5 so that the internal horn 9 and the fold-back horn 1o are built-in
43. It is configured to be combined. In such a configuration, the sound pressure-frequency
characteristics can not be changed according to the use environment, and horn speakers that
individually meet the individual requirements are separately made. As a result, as the usage
environment becomes more complex, the types of models become more diverse, which causes
various problems in terms of cost and product management. The present invention eliminates the
above-mentioned conventional drawbacks. Hereinafter, the present invention will be described
with reference to FIGS. 2 to 4 of an embodiment. First, in FIG. 2, reference numeral 12 denotes a
field portion, and the field portion 12 is constituted by a plate 14 provided with a center pole 13,
a ring-shaped magnet 15, and a ring-shaped upper plate 16 as well. A dome-shaped diaphragm
17 is disposed on the field portion 12, and a voice coil 18 is coupled to the dome-shaped
diaphragm 17. The voice coil 184 is connected to the magnetic gap 19 of the field portion 12
described above. I'm stuck in it. An internal horn 20 having a horn throat is disposed on the
upper surface of the dome-shaped diaphragm 17, and an M-shaped folded horn 21 is disposed at
a position corresponding to the open end of the internal horn 20. . These internal horns 20. A
fixed external horn 22 coupled so as to cover the field section 12 at the lower end is disposed on
the outer peripheral portion of the folded back horn 21, and the rotary roller 23 is attached to
the outer surface of the open end of the fixed external horn 22. ing.
A movable external horn 24 configured to have the same diameter from the middle portion to the
lower end portion via the rotation roller 23 is incorporated in the fixed external horn 22. Thus,
by dividing the fixed external horn 22 and the movable external horn 24 into two as the external
horn and moving the movable external horn 24 to adjust the length of the external horn, the
sound pressure-frequency characteristics as shown in FIG. The adjustment of can be done freely.
This FIG. 3 y, hK ′ ′ ′ t, “r * i ′ ′ Cyx <t% 8 ′ ′ CM! *−y&! 4! When <↓ ', the
characteristic shown by the alternate long and short dash line is the characteristic when the
external horn is made as short as 5 at most, and the characteristic shown by the broken line is
the characteristic when the length of the external horn is approximately halfway between them.
Thus, the bass characteristic can be arbitrarily changed. In order to facilitate the sliding of the
fixed outer horn 22 and the movable outer horn 24, respectively, the rotating roller 23 may be
used as described above, and a bearing may still be used. Furthermore, as shown in FIG. 4, a
slippery synthetic resin layer 25 such as Teflon can be formed on the sliding portion of the both.
As described above, since the horn speaker according to the present invention is configured, the
length of the external horn can be freely varied, and the external horn is shortened to be used in
noise with many low frequency components, thereby reproducing the bass region. Can be
suppressed and the clarity can be improved. In addition, it becomes possible to adjust the length
of the horn and set the clarity optimum point while the horn speaker is set. It is possible to adapt
to various ring) o 'boundaries with one kind of horn speaker, 1 Mass production of the model is
possible, and it is advantageous in terms of cost reduction as well. It has great advantages and
practical value.
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