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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a front view of a conventional horn
speaker, FIG. 1 (c) is a sectional view taken along the lines A-A and B-B of FIG. 1 (a), and FIG. FIG.
3A is a front view of the horn according to an embodiment of the present invention, FIG. 3 is a
cross-sectional view taken along the line A-A of FIG. 3A, and FIG. FIG. 5 is a view showing an
equiphase surface in the horn of the horn speaker of the invention, and FIG. 5 is a cross-sectional
view of a spherical diaphragm of the horn speaker of the invention. 4
························································································································ · · · · · · · · · · · · · · · · · · conical cone, 5 · ·
· spherical diaphragm, 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ... centrality of spherical
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the Ho 7 Sbeeker,
and it is an object of the present invention to provide a Ho / speaker which transmits acoustic
power uniformly in the Ho 7 and does not produce peaks and valleys in Cesarean frequency
characteristics. First, FIG. 1 a shows a conventional horn speaker. b, c and FIG. 2 will be described
together. In FIGS. 1 and 2, 1 is a horn, and a plane orthogonal to the central axis is rectangular. 2
is a spherical diaphragm disposed at the throat portion of the horn 1, 3 is a drive diaphragm of
the spherical diaphragm 2, 'a diaphragm driving unit 1 is a table, and FIG. The figure shows the
result of measuring the equal phase surface S in the horn 1p ˜ / / 12 and the sound wave
radiated from the spherical diaphragm 2 propagates in the rectangular horn 1 and the opening
of the ho 71 Reaching the surface ・ Interphase surface S with a curvature different from the
curvature of the spherical surface of the spherical diaphragm 2 is given, so that the radiation
innopyance when the Ho 7 opening is viewed from the spherical diaphragm is disturbed, and the
sound There is a drawback that the peak frequency characteristics produce a valley. The present
invention eliminates the above-mentioned conventional drawbacks, and one embodiment of the
present invention will be described below with reference to FIGS. 3a and 3b. In FIG. 3 and FIG. 4,
4 is conical ho / (conical ho)], 5 is the above conical ho 74 no y ,. A spherical diaphragm
arranged at the girth, a center point Q of the spherical diaphragm 5, that is, a point where
perpendiculars from the respective points of the spherical diaphragm 5 intersect as shown in FIG.
, And the apexes P of the conical hos 74 coincide with each other. Reference numeral 6 denotes a
drive unit for driving the conical ho 74. As described above, the center point Q of the spherical
diaphragm and the circle), @i ′ ′ ′ ′ − 7oDi, a ′ ′ ′ ′, −fk, −J! cMF! In fiiiI, -h * @
3, a part of the sound wave emitted from the point source placed at point P is guided as if it were
propagating in ho 7, and it becomes a natural propagation state, As shown in FIG. 4, it has an
equal phase surface S 'with the same curvature as that of the spherical diaphragm, so that the
acoustic power propagates uniformly in the horn, and there is an advantage that caesar
frequencies, in particular, no peaks and valleys are generated.
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