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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an essential
part of a conventional horn speaker, FIG. 2 is an enlarged partial view of the equalizer and pole
of FIG. 1, a is its top view and b is a Fig. 3 is a sectional view taken along the line AA, Fig. 3 is an
embodiment of the present invention, and Fig. 4 is another embodiment according to the present
invention. B is a cross-sectional view taken along the line A-A of FIG. 2・・・・・・ダイヤフラ
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to horn speakers,
and it is an object of the present invention to improve the performance and manufacturing of (1-,
7 '1 -equalizers). In general, an equalizer for a rear type horn speaker having a slit uniformly
transforms the acoustic power generated from a diaphragm provided in proximity to the
equalizer, and performs phase equalization 1 to enable iFi reproduction. Although the prior art
has a plurality of slits formed in a concentric conical cylinder shape, an acoustic open circuit is
generated at a constant frequency between the slits, and a large dip is generated at the frequency
to produce high-frequency reproduction here. There is a drawback that causes limitations, and
furthermore, since a plurality of +311 or more> conical equalizer pieces that form slits are made
of different sizes and shapes, three or more pieces are required to manufacture these equalizer
pieces. There is an economic disadvantage of requiring a mold. That is, the conventional horn
speaker is configured as shown in FIG. 1 and FIG. In these drawings, 1 is a diaphragm cover, 2 is
a dialanola, '· · · · its sound-producing part is dome-shaped, 3 is a 2-table] frequency equalizer and
the end face opposite to the diaphragm is substantially constant with the diaphragm 2 It is
formed in a convex shape with an interval. And this equalizer has a slit 3 'constituted by a
concentric conical surface whose center line is its center line. 4はスrJ−ト、5 7
2−1.6 “r↑−bf□IX’)yh。 □ Has a conical hole that forms a two-dimensional
shape. 7 is a yoke, 8 is a magnet, 9 is a magnetic air gap, 10 is a voice, and 11 is a horn. FIG. 2 is
an enlarged view of a portion of the equalizer 3 and the pole 6 in FIG. 1, in which (α) is an F-
plane and (b) is an AA cross-sectional view of the (α). Since the conventional riser “riser”
configured in this way has concentric conical cylindrical slits, it produces an acoustic open
narquinot at a constant frequency between each slit, 11 being 1 or 12 being 4 (Where λ is the
wavelength). And this becomes a substantial high frequency reproduction limit. Therefore, in
order to increase the dip by C, l and j2 are determined so that the dip-wave number by l and 12
is the same 3-. Therefore, depending on the magnitude of the horn load on the dome surface of
the diaphragm 2, a constant vibration mode of the diaphragm 2 is generated, and the highfrequency distortion tends to increase.
In addition, although this example has a double conical cylindrical slit, in order to increase the
dip frequency, it is necessary to further multiplex the slit by three or five, resulting in a
complicated structure and a high cost. There was a disadvantage such as being unavoidable.
SUMMARY OF THE INVENTION The present invention is to improve the above-mentioned
conventional equalizer to eliminate the drawbacks thereof, and to provide a low cost horn
speaker having a high high frequency reproduction limit and a low high frequency distortion.
The present invention will be described in detail by way of embodiments of the drawings. FIG. 3
is an embodiment of the present invention, and FIG. 6) is a top view and (bl is an (A)) A-AWfT
plan view of FIG. As is clear from the figure, the equalizer provided in the first embodiment of the
present invention, like the one in FIG. 1, is concentrically multiplexed (threefold in this
embodiment) by centering on the center line. A slit 50 is provided, and the slito 4-; 1,..., The nib 1
1 1 ′ ′ 50 forms a polygon (a regular pentagon in this embodiment) on the dome-shaped
convex surface of the equalizer, and the other end surface ) Is formed to be circular. Further, the
adjacent polygons are arranged such that opposite sides thereof are not parallel. Each slit is
formed so that its cross-sectional area gradually changes as it is separated from the dome-shaped
convex portion. The equalizer pieces divided by the multiple slits 50 are provided with a plurality
of convex portions (three in this embodiment) on one of the opposing equalizer pieces. A
plurality of concave portions are provided on the riser piece, and these convex portions or
convex portions or concave portions are adhered or caulked to constitute one equalizer. In the
present embodiment configured as described above, as in the conventional example small in FIG.
2, since the inner and outer slits are not equally spaced, in other words, concentric circles are not
formed, a large dip occurs at a given constant frequency. There is no sound, and the sound
gradually attenuates as the frequency rises. 5-2 f Therefore, by appropriately selecting the
number of multiple slits, the high band reproduction limit higher than that of the conventional
one can be obtained, and not only the effect of reducing the high band distortion can be
obtained, but the equalizer of the present invention Since there is no sharp sound attenuation
compared to the conventional one, the number of slits can be reduced to obtain the same high
frequency reproduction limit as the conventional one, thus lowering the cost. It has the
advantage of being able to In the above embodiments, the outline of the slit in the dome-like
convex surface of the equalizer has been described as a regular pentagonal contour, but the
contour does not have to be regular pentagonal and may be a polygon having a triangle or more.
However, as the number of corners increases, it becomes closer to a circle and its effect
diminishes. Moreover, it does not need to be a regular polygon, and it may be a simple polygon.
FIG. 4 is another embodiment of the present invention in which the outline of the slit in the dome
expansion surface of the equalizer is a square, (α) is a top view thereof, and (61 is an illustration
thereof. A-A11 of FIG. As described above, according to the present invention, there is an
advantage that a horn speaker provided with an elyzer having a high reproduction limit and a
small amount of high-frequency distortion can be obtained at a cost of 61.
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