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JPS5797793

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DESCRIPTION JPS5797793
Description 11 Title of Invention
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker,
and more particularly to an improvement of the one provided with a flat diaphragm.
Conventionally, FIG. 1 shows a condenser type speaker as a speaker unit having a flat diaphragm.
A horn speaker configured as shown in FIG. 2 is known. That is, the one in FIG. 1 is a push-pull
type with no throttling, and is supported between a pair of fixed poles 12.12 located at the throat
of the horn 11 and arranged in a direction orthogonal to the horn axis direction. A push-pull
capacitor type speaker unit 14 having a planar diaphragm 13 is provided. However, such a horn
speaker has a drawback that the area of the throat becomes too large, resulting in deterioration
of directivity. FIG. 2 shows a single type with squeezing, a fixed pole 22 disposed in the same
direction as described above in a cavity fgl having an area larger than that of the horn 21
(connected to the throat of the horn 21); A single-type capacitor type speaker unit 24 having a
planar diaphragm 23 is provided. However, such a horn speaker has a disadvantage that the
volume of the air gap 1g + becomes too large, resulting in a reduction in high range. By the way,
all of the drawbacks of the horn and Bee force originate from the capacitor type speaker itself
which is used as a speaker unit having a flat diaphragm, and in general, this type of speaker unit
has directivity in high frequency range. The degradation is large and the efficiency is poor, and in
the case of the inefficiency, it is almost the case that the EndPage: 1 area is compensated.
Therefore, the present invention has been made in view of the above points, and it is an object of
the present invention to provide an extremely good horn speaker which is improved so as to
obtain as high performance as possible even with a planar vibration amount. And An
embodiment of the present invention will be described in detail with reference to the drawings.
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That is, as shown in FIG. 3, the speaker unit 3-2 connected to the throat of the horn 31 is a pair
of planar vibrations connected to the bottom end of the horn 31 in parallel with the horn axis
respectively. A pair of condenser-type speaker units 321, 321 each consisting of a plate 331,
332 and a pair of fixed poles 34'l, 342 arranged at a predetermined distance on the opposite side
to the opposite sides of the respective diaphragms 331, 332. The horn speaker, which is
arranged as above & 4 & b at 4,4 ░, has 322, and has a flat diaphragm like a condenser type
speaker etc. And the gap between the pair of planar diaphragms relative to each other is in direct
communication with the space within the horn portion. That is, the configuration is such that a
sound wave (speed) is given to the horn by the gap (slit) between the pair of opposed
diaphragms.
By this, it is possible to make the throat diameter + dl of the horn unit 21 extremely small, and if
the depth +11 of the speaker unit 3-2 is kept small along with this, the reproduction in the high
sound range becomes so advantageous . Moreover, since the ratio of the throat diameter 1 dl of
the horn portion 21 to the opening diameter 0 can be inevitably increased by this, it is possible
to increase the throttling rate so as to contribute to high efficiency and to improve the% horn as
a whole. It enables the miniaturization of the shape and can contribute to the improvement of
directivity as well, which in turn enables the miniaturization of the speaker unit section 3-2
(especially because it can be a low-capacity unit in the case of a capacitor type). It is possible to
reduce the load on the output amplifier. Furthermore, by using the pair of speaker units 321%
322 in a complementary manner, even if it is apparently a single type, substantially the same
operation as a push-pull type operation is performed to reduce the distortion by that amount.
Can also contribute. That is, even if a flat diaphragm is provided as a whole, it is possible to
realize a horn speaker of high performance as much as possible without reducing the size of the
high-frequency band and reducing the directivity. For example, when a 1 cm О 4 cm flat (square)
plate-shaped electret condenser speaker is used as the speaker unit 321.322, compared to the
case of the conventional (FIG. 1 or FIG. 2 etc.) one having 5 capacitors. It has been confirmed that
both efficiency and directivity can be significantly improved. The present invention is not limited
to only the embodiments described above and shown in the drawings, and it is needless to say
that various modifications and applications are possible without departing from the scope of the
present invention. Therefore, as described above in detail, according to the present invention, it is
possible to provide an extremely good horn speaker which is improved so as to obtain as high
performance as possible even in the case provided with a flat diaphragm.
4. Brief description of the drawings FIGS. 1 and 2 are structural explanatory views showing a
conventional push-pull and single type horn speaker, and FIG. 3 is a structural explanatory view
showing an embodiment of the horn speaker according to the present invention. FIG. 31 и и и horn
unit 2 и и и speaker unit. 331.332 иии Planar diaphragm, 341.342 и и и Fixed pole, 321, 322 иии
Capacitor type speaker unit. Applicants Attorney Attorney Takehiko Suzue EndPage: 2lrl Figure 2
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Figure 3, 13 Figure EndPage: ?
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