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JPS5728577

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5728577
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional horn
speaker, FIG. 2 is a cross-sectional view of a horn speaker according to the present invention, and
FIG. 3 is an output sound of the conventional horn speaker of the present invention It is a
characteristic view which compares and shows pressure characteristics. DESCRIPTION OF
SYMBOLS 1 ... Diaphragm, 2 ... Air chamber, 3, 7 ... Horn throat, 4 ... Horn, 5 ... Equalizer. Note
that the middle part of the figure indicates the same part.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to horn-type
loudspeakers, and more particularly to horn-type loudspeakers having a modified horn throat
shape. FIG. 1 shows a conventional horn type speaker, in which 1 is a driving diaphragm% 4 a
horn and 5 an equalizer, between which an air chamber 2 is formed. The air chamber 2 is
connected to the air space 6 and the horn throat 3 by means of the ho 74 and the equalize f5 via
a microphone 1, tz, 7, 7. In the horn-type speaker having such a structure, the cross-sectional
area of the slate 3 is smaller than the area of the diaphragm l, so that its position in the air
chamber 2 is substantially determined. And if the position of the throat 3 is not appropriate, the
influence of the air chamber 2 is directly influenced by the characteristics of the speaker. That is,
for example, high efficiency can be obtained on the output sound pressure characteristic, but
peaks and valleys are prominently generated in this characteristic, and the high frequency
reproduction limit frequency of only the air chamber 2 is almost determined. For this reason, it is
conceivable to determine the position of the throat 3 with sufficient accuracy in design, but such
positioning is not practical. This invention was made in view of the point mentioned above. An
object of the present invention is to provide a horn type speaker in which the influence of the air
chamber on the speaker characteristics is mitigated. Hereinafter, an embodiment of the present
invention will be described with reference to the drawings. A horn-type speaker according to the
present invention is shown in FIG. In this figure, the same parts as those in FIG. In the horn type
speaker according to the present invention, the horn throat 7 is formed to be rounded so that its
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cross-sectional area gradually increases toward the air chamber 2. Therefore, since the position
of the throat 7 is K if it has an appropriate width with respect to the air chamber 2, the influence
from the air chamber 2 can be mitigated even if the position of the throat 7 is determined
relatively to some extent. As a result, although the upper output sound pressure level is lowered
to some extent in characteristics, the change of the peaks and valleys is small, and the high
frequency reproduction limit frequency is increased. FIG. 3 is a characteristic diagram showing
the comparison between the calculation result of the output sound pressure characteristic of the
conventional high-tone horn speaker of this type and the calculation result of the output sound
pressure characteristic of the high-tone horn speaker according to the present invention. So, the
broken line shows the characteristics of the conventional and the solid line of the horn-type
speaker of the present invention. As apparent from this figure, the horn type speaker of the
present invention has a reproduction sound pressure lower than that of the conventional one at
around 8 KHz, but it is about 11 KH. As in the prior art, it rises at about 14 KHzj without
lowering, the reproduction band is expanded, and the% property is flattened.
The calculation of the output sound pressure characteristic was performed by applying the finite
element method inside the horn. In the above embodiment, the throat 7 is formed in a rounded
shape, but if the cross-sectional area of the throat 7 is gradually increased toward the air
chamber 2, the same result as described above can be obtained. Of course. As described above,
according to the present invention, the horn throat is formed so that the cross-sectional area
thereof gradually increases toward the air chamber, so that the influence of the air chamber on
the speaker characteristics is mitigated and the flat output sound pressure is achieved. Thus, it is
possible to obtain a horn type speaker which has characteristics and can realize wide band
reproduction.
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