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JPS5399141

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DESCRIPTION JPS5399141
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a general horn-type
speaker, FIG. 2 is a cross-sectional view of the main part of a horn-type Spinika according to one
embodiment of the present invention, and FIG. . 2 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Teba part.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn type
speaker, and it is an object of the present invention to improve high frequency range
characteristics. FIG. 1 shows a schematic structure of a horn type speaker, 11 ? ? i horn base, 3
is an equalizer, 4 is a diaphragm, 6 is a magnetic circuit section for making an inner magnetic
yoke M, e is a throat of a horn, When 7 is a slit of the equalizer, the equalizer 3 aligns the loss
when the sound radiated from the diaphragm 4 reaches the skirt portion of the horn / '2 &) 9It
// 2 phase , 1 m just in front of the diaphragm 4 and restricts the sound wave outlet on the
circumference of a small width, that is, the slit 7. However, in general, the sound wave emitted
from the slit 7 of the equalizer 3 passes through the cross section formed by the horn pace 2 and
the equalizer 3 and causes phase interference to some extent before reaching the throat 6 and
jumps to the same wave number characteristic of the high range. Unevenness and the output
sound pressure is reduced. The present invention eliminates such drawbacks. Hereinafter, the
non-invention will be described with reference to the horn pace and the equalizer same side of
FIG. 2 as an example. In the figure, reference numerals 2, 3, 6, 7 respectively correspond to parts
of the same reference numerals in FIG. The difference is that the distance from the curvature
center 8 of the equalizer 3 to the tabe 21 of the horn pace 2 is x1 the curvature-radius of the
equalizer 3 r and the radius of the throat 6 of the horn pace 2 is "a" 2 =, 2 + a23 This means that
the cross-sectional area formed by the tapered portion 21 of the ho / base 2 and the equalizer 3
is made to coincide with the area of the throat portion. Next, the operation of the embodiment
configured as described above will be described. The sound wave from the diaphragm travels
from the slit 7 through the space formed by the equalizer 3 and the tapered portion 21 and
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travels back in the direction indicated by the C-line arrow and forms a right angle with the
traveling direction of the sound wave reaching the throat 6 The area is a cross-sectional area in
which the equalizer 3 and the tapered portion 21 are formed. When the sound wave passes
through this space, if the cross-sectional area changes, phase interference occurs at the same
wave number corresponding to the change, and the output sound pressure in the high range
decreases. Therefore, in order not to cause phase interference, the cross-sectional area should be
constant from the position of the slit 70 to the throat 6. That is, the tapered portion 21, h <-r
month "P-3 Tiff 1 i A 11? It is sufficient that "1ii" matches the area of "░ -1: 6. :When. ???
?
Example 4 The phase interference is unlikely to occur up to the high range in 1 ltL-c, 4 ?. 4
shows the sound pressure characteristics of the conventional speaker and the speaker according
to the above embodiment as B and A, respectively. The output sound pressure characteristic of
the present embodiment is particularly improved in the high range compared to the conventional
one. It is done. As apparent from the above-described embodiment, according to the invention,
the characteristics of the high-frequency band can be improved simply by matching the area
constituted by the equalizer and the taper portion of the horn base portion with the area of the
horn throat portion.
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