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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional horn
speaker, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is the
sound pressure between the conventional horn speaker and the horn speaker of the present
invention. Graph to compare characteristics. 1・6169. Yoke, 2 · · · · · · · · · · · · · · · · · · · · · · · · · ·
Center pole, 4 ° ° · · · · · · dome diaphragm, 5 · · · · · voice coil, 6 · · · Upper plate 7, curved frame
8, horn 9, braking material 10, braking correction piece.
DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the sound
pressure customization in the low range of a horn speaker with a dome diaphragm. In general, in
the case of a loudspeaker, the baffle plate affects the sound pressure custom-made in the low
frequency region to a large extent. FIG. 1 is a view showing a conventional horn speaker, ■
indicates yaw, 2 indicates a magnet, 8 indicates a center pole, 4 indicates a dome diaphragm, 5
indicates a voice coil, 6 indicates an upper plate, 7 indicates a frame, 8 indicates a horn , 1-formed between the center pole 3 and the dome diaphragm 4. jj-//! Ku 2/1 · J · · · · · · · · '' damping
material 9 is inserted in the space '1 to seek to flatten the sound pressure characteristics in the
low region ,. The speaker D sound pressure characteristics are different depending on the use
condition of the speaker, or the characteristics as shown in FIG. 8 when the speaker unit is
installed on the top surface of the speaker canopy. In the same figure, a represents the
characteristics of the sound pressure in Ji theory when the speaker unit is attached to the infinite
baffle, and b represents the sound pressure holding time of the speaker in FIG. As shown in the
figure, when b is in the low range of 15 to 5.0 KH 2, the sound pressure characteristics rise or
fall and the flatness is lost, and the braking by the braking material 9 does not give a sufficient
effect. The present invention is intended to flatten the sound pressure characteristics in the low
range of the 15 to 5.0 KH 2, and the present invention is constant along the downward direction
of the dome diaphragm. The object of the present invention is achieved by providing an
umbrella-shaped braking correction piece having a spherical arc-shaped head for holding a
clearance and filling the braking material below the braking correction piece. An embodiment of
the present invention will be described with reference to FIG. In the same figure, the symbols 1 to
9 are the same as those in FIG. A braking correction piece 10 according to the present invention
is formed into an umbrella shape having a spherical arc-shaped head and a shaft, the shaft is
fixed to the center pole 8, and the head is fixed to the center pole 8. There is a fixed gap d
between the head of one braking auxiliary piece 10 filled with the damping material 9 and the
dome diaphragm 4 between them, and the viscosity of air in this gap d is the same as that of the
dome diaphragm 4. Brake the vibration evenly. In FIG. 8, C is the sound pressure characteristic of
the speaker of the present invention of FIG. 2, and the sound pressure holding frequency in the
low range of 15 to 5.0 KH2 is flat compared to the sound pressure characteristic of the
conventional speaker of FIG. It can be seen that it is closer to the theoretical characteristic a.
Since the braking characteristic by this braking correction piece 10 is determined by the gap d
between the straight arc e of the spherical correction head of the braking correction piece 10
and the dome diaphragm ↓, the speaker can be set by appropriately setting e and d. It is possible
to cope with the change in low-pass sound pressure characteristics as the unit installation
conditions change.
As described above, the speaker according to the present invention has a low frequency range by
making the gap between the dome diaphragm 4 and the damping material 9 8-,. Have an
excellent effect of flattening sound pressure characteristics.