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JPS54168833

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DESCRIPTION JPS54168833
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 the horn speaker in one embodiment of the present
invention, and FIG. 3 is an acoustic power characteristic diagram of the horn speaker of the
present invention. 4a shows the shape of the horn of the horn speaker of the present invention,
FIG. 4c shows the shape of the horn for comparison, and FIG. 5 shows the horn of the present
invention and the comparative example. It is an acoustic power □ characteristic view of a
speaker. Reference Signs List 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · plate ........・ Hoice coil. Fig. 2 Fig. 3 tc, stop tone □ U 臥
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker
having an exponential horn, and to provide a horn speaker having a short horn length and
capable of obtaining flat acoustic power characteristics. FIG. 1 shows a conventional horn
speaker. In FIG. 1, reference numeral 1 denotes a yoke in which a center pole 2 is integrally
formed E, and a hole 3 is formed in the center pole 2. Reference numeral 4 denotes an annular
magnet fixed to the above-mentioned yoke 1 and 6 an annular plate fixed to the magnet 1 4. This
ring 1.3 '; t- / IJI) -32- An annular magnetic gap is formed between the inner peripheral surface
of the plate 6 and the outer peripheral surface of the center pole 2. A hemispherical equalizer 6
is fixed to the end face of the center pole 2 and a hole 7 is formed in the equalizer 6. A domeshaped diaphragm 8 is supported on the plate 6 by a clamp part 9 and the dome-shaped
diaphragm 8 is disposed in the vicinity of the end face of the equalizer 6. 10 is a horn main body
fixed to the end face of the yaw 1 and this horn main body 10. The hole 7 of the center pole 2
and the hole 7 of the equalizer 6 form an export 7 dial horn. A voice coil 11 is fixed to the domeshaped diaphragm 8, and the voice coil 11 is disposed in the magnetic gap. When an electric
signal is applied to the voice coil 11, the dome-shaped diaphragm 8 vibrates to generate a sound,
and the sound is emitted to the outside through the X-Bonnen dial. In addition, when the crosssection is a Th circle, the exho-no-nochal horn has a force change owing to a diametrical force or
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there is J -'- 7'3f +. Dx=De! n8, Dx: A diameter at a distance X from the reference point in
the ho / opening direction. m: opening (-4yrlc / Csfc: cut-off frequency, C: speed of sound) e:
bottom of natural logarithm. Since the opening m of the conventional horn speaker shown in FIG.
1 is constant, the horn length becomes long and the acoustic power characteristics are not flat.
The present invention eliminates the above-mentioned conventional drawbacks, and one
embodiment of the present invention will be described below with reference to FIG. The feature
of this embodiment is that the opening m1 of the hole 7 of the equalizer 6 constituting the throat
portion of the exponential horn is larger than the opening 3 of the center ball 2 and the opening
m2 of the horn body 1o. There are also 4t knees: '.
FIG. 3 shows the sound power characteristic of the above embodiment, which is flat. FIG. 4a
shows an exponential horn according to an embodiment of the present invention, in which the
opening m1 of the horn throat III is larger than the opening m2 on the side of the horn opening.
In the A band in FIG. 3 of the horn speaker according to the present invention, the opening m2,
that is, the cutoff frequency f. 22C =-Work with 4。 and エ ク ス つ エ ク ス 不 ン ン ン ン. That
is, as shown by the dotted line in FIG. 4 a in the A band, it acts as an exponential horn with m2 of
opening of the equalizer part, and the throat diameter is apparently enlarged from D1 to D2 from
above. Become. In the C band in FIG. 3 still, 1 C opening ml, that is, the cutoff frequency f. It
works as an 1- □ 4π exponential horn, and the throat diameter is determined by the diameter
D1 of the equalizer inlet. As a result, in the C band, the diaphragm area vs. throat area ... to 1 →
Tsuno! , 74-5. The acoustic transformation ratio represented by the ratio of (1) increases and the
acoustic power increases. Fig. 4 and c are comparative examples for clarifying the operation and
effect of the above embodiment, and the example of Fig. 4 is the same as the opening diameter
Do of the embodiment of the present invention shown in Fig. 4 a. An exposed non-dial horn with
a throat diameter of Dl and a constant opening degree of m2, the horn of this comparative
example has a long horn length, and the acoustic power characteristics are as shown in b of FIG.
The sound power level is high, but the difference between the low band and the high band ruhel
is large. FIG. 4C shows the aperture diameter of the embodiment shown in FIG. 4 a. The same as
in the above, and the horn length lO is the same, and the opening is m2 constant exponential
horn, and in this comparative example, the horn length is a short sword), and the acoustic puff
level is lowered as shown in FIG. In addition, there is a drawback that the level difference
between the low band and the high band is large. On the other hand, according to the present
invention, the horn length is short, and the acoustic power characteristic has an advantage of
being flat as shown in FIG. 5 a. 6. In each of the above embodiments, the opening m of the
exponen / dial horn is made into two stages, and the horn throat side is enlarged. However, the
opening side of the ex vo- nen 7 jar horn is opened. The plug may be changed stepwise in
multiple stages so that the throat side becomes larger. The present invention is configured as
described above. According to the present invention, it is possible to shorten the horn length and
to obtain flat acoustic power characteristics.
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