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JPS56140799

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DESCRIPTION JPS56140799
Description 1, title of the invention
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3. Detailed Description of the Invention In the present invention, output sound pressure is
nonlinearized due to temperature rise of voice coil, burnout of voice coil is prevented and voice
coil cooling medium is between equalizer and diaphragm. The present invention provides a horn
speaker that does not enter the slit of the equalizer within the minute gap of An eleventh line 1
shows a cross section of a conventional horn speaker. In FIG. 1, 1 is a yoke integrally formed
with a center bow v2 at the center of one surface, 3 is a through hole formed in the center pole 2,
4 is an annular magnet fixed to the yoke 1, 5 is a Mack It is an annular yoke fixed to the net 4,
and an annular magnetic air gap is formed in the inner peripheral portion of the yoke 5 and the
outer peripheral surface of the center bow / V 2. A support link 6 is fixed to the yoke 5 by a bolt
7, and a working EndPage: 1 / soji portion 9 of the dome-shaped diaphragm 8 is fixed to the
support ring 6. A cylindrical coil bobbin 1 o is fixed to the concave side of the dome-shaped
diaphragm 8, and a voice coil 11 is wound around the coil bobbin 10. The voice coil / L '11 is
disposed in the magnetic gap. An equalizer 12 is fixed to the end of the center pole 2 and the
outer surface of the equalizer 12 is a curved surface similar to the concave surface of the domeshaped diaphragm 8. 0 t 13 is formed. The diameter of the slit 13 decreases toward the center
pole 2 from the dome-shaped diaphragm 8 side, and the cross-sectional area increases. Reference
numeral 14 denotes a container, and the yoke 1 is fixed to the inner surface of the container 14
by a bolt 15. Reference numeral 16 denotes a hole formed in the container 14. The hole 16 and
the through hole 3 of the center port / L / 2 coincide with each other. Reference numeral 17
denotes a horn fixed to the outer surface of the container 14 by a bolt 18, and 19 a lid for closing
the open end of the container 14. A sound absorbing material 2o is provided on the inner surface
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of the lid 19. In FIG. 1, when a signal is applied to the voice coil 11, the dome-shaped diaphragm
8 vibrates and a sound is generated. The sound radiated to the concave side of the dome-shaped
diaphragm 8 is the slit 13 of the equalizer 12 and the center pole. The radiation is emitted to the
outside through the through hole 3 and the horn 17 of the above. The equalizer 12 functions to
align the phase of the sound pressure generated at each portion of the dome-shaped diaphragm
8. However, in the above-mentioned conventional horn speaker, when a thermal insulation layer
of air is interposed between the voice coil 11 and the center pole 2 and the yoke 5 and a large
input is applied to the voice coil 11, the temperature of the voice coil 11 There is a drawback
that the DC resistance increases, the output sound pressure becomes non-linear, and the
maximum output sound pressure decreases.
In some cases, the voice coil 11 may be burnt out. Further, in the above-mentioned horn speaker,
the minute gap (02 to 1 mm) between the dome-shaped diaphragm 8 and the equalizer 12 has
flatness and sound pressure frequency characteristics. Although the efficiency is affected, in the
above-described conventional example, since the dome-shaped diaphragm 8 and the equalizer 12
can not be integrated, it is difficult to control the minute gap, and there is a disadvantage that the
manufacturing process varies. The present invention eliminates the above-mentioned
conventional drawbacks, and one embodiment of the present invention will be described below
with reference to FIG. In FIG. 2, 21 is a yoke integrally formed with a center port / v 22, 23 is a
through hole formed in a center pole 22, 24 is fixed to the yoke 21, an optical annular magnet,
25 is fixed to a magnet 24 An annular magnetic gap is formed between the inner peripheral
surface of the yoke 25 and the outer peripheral portion of the center pole 22. Reference numeral
26 denotes an equalizer, and a cylindrical support portion 27 is integrally formed on the outer
peripheral portion of the equalizer 26, and an annular attachment portion 28 is provided at one
end of the support portion 27. The mounting portion 28 of the equalizer 26 is fixed to the yoke
25 by a bolt 29. A stepped portion 30 is formed on the inner peripheral portion of the cylindrical
support portion 27 of the equalizer 26. An edge portion of the dome-shaped diaphragm 31 is
fixed to the stepped portion 3o by a fixing ring 32. A cylindrical coil bobbin 33 is fixed to the
convex side of the dome-shaped diaphragm 31. A voice coil 34 is wound around the coil bobbin
33. The voice coil 34 is disposed in the magnetic gap. 36 is an electrically insulating magnetic
fluid filled in the magnetic air gap of the magnetic circuit, and this magnetic fluid 35 is coated
with a surface active agent of the surface of magnetic ultrafine particles such as Fe 2 O 2 of 30 Q
┼ or less. The particles are dispersed in a solvent of the above, and the aggregation of the
particles does not occur even in the magnetic field of the magnetic gap, and the particles are
attracted and self-held in the magnetic gap. The thermal conductivity of this magnetic fluid is 3
to 6 times that of air, and the heat of the voice coil 34 is transmitted to the yoke 25 and the
center port v 22 through the magnetic fluid 35 to prevent the temperature rise of the voice coil
34 Be done. This structure prevents non-linearity of output sound pressure due to temperature
rise of voice coil, reduction of maximum output sound pressure and burnout of voice coil
EndPage: 2 and a structure that fixes dome-shaped diaphragm 31 to equalizer 26 Because of this,
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it is possible to make the minute gap between the dome-shaped diaphragm 31 and the equalizer
26 uniform and to obtain stable characteristics.
Further, according to this embodiment, the following effects can be obtained. That is, when the
coil bobbin 33 has a large amplitude, the magnetic fluid 35 filled in the magnetic gap may
slightly jump out when an impact is applied from the outside, for example. Further, even if the
magnetic fluid 35 does not fly out, the solvent of the magnetic fluid 35 may evaporate if the
temperature of the voice coil / v 34 rises. When the magnetic fluid or the evaporated solvent
thus ejected from the magnetic gap condenses to enter the minute gap between the dome-shaped
diaphragm 31 and the equalizer 26 or into the slit of the equalizer 26, the dome-shaped
diaphragm The vibration of 31 may be suppressed or the low frequency sound pressure may be
reduced, which may cause a large disturbance in the sound pressure frequency characteristic. ?
????? When the izer 26 is formed of an acrylic resin, a mu-BS resin, or the like, there is a
risk of being corroded by the magnetic fluid 35 solvent. In the present embodiment, since the
magnetic circuit is disposed on the convex side of the dome-shaped diaphragm 31 and the
equalizer 26 is disposed on the concave side, the ejected magnetic fluid 35 or the evaporated
solvent is in the slit of the equalizer 26. The diaphragm 26 does not enter the minute gap
between the equalizer 26 and the dome-shaped diaphragm 31, and the vibration of the domeshaped diaphragm is suppressed, the low-range sound pressure is reduced, and the sound
pressure frequency characteristic is largely disturbed. Does not occur, and the equalizer is not
eroded. In FIG. 2, reference numeral 36 denotes a container, and the yoke 21 of the magnetic
circuit is fixed to the step portion in the container 36 by means of a bonnet 37. Reference
numeral 38 denotes a sound absorbing material accommodated in the container 36, and 39
denotes a cover plate for closing the open end of the container 36. The cover plate 39 is
integrally formed with a horn 4o. Reference numeral 41 denotes a bolt for fixing the lid plate 39
to the container 36. FIG. 3 shows a second embodiment of the present invention. This
embodiment further enhances the cooling effect of the voice coil 34 according to the above
embodiment. In FIG. 3, reference numeral 42.43 denotes an annular groove formed on the inner
peripheral surface of the yoke 25 and the outer peripheral surface of the center port v22, and
the magnetic gap is divided into two by the annular groove 42.43. The magnetic fluid 35 is filled.
The reference numeral 44 denotes a cooling fluid accommodated inside the magnetic circuit, and
the cooling fluid 44 is sealed by the magnetic fluid 35. The coolant 44 is a liquid having a boiling
point higher than that of water and a freezing point lower than that of water, such as a mixture of
higher alcohol and glycerin, and having a large thermal conductivity, such as ethylene glycol.
The ethylene glycol III has a boiling point of 197 ░ C., a freezing point of 12 ░ C., a thermal
conductivity of 0.26 J / m at room temperature, Sec, ? ?, and the thermal conductivity is about
10 times that of air. When this ethylene glycol is used as a coolant, the temperature rise of the
voice coil is aside compared to the conventional example shown in FIG. 1, and the human
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resistance and the maximum output sound pressure are improved. In FIG. 3, -45 is fitted in the
hole formed in the yoke 21 1. The vibrator 45 functions to absorb the heat and tension of the
coolant and to prevent the coolant 44 from spilling due to the surface tension of the capillary.
Reference numeral 46 denotes a non-volatile high-viscosity liquid contained in the pipe 45,
which prevents evaporation of the coolant 44. FIG. 4 shows a third embodiment of the present
invention. In the present embodiment, the coil bobbin 33 is fixed to the convex surface of the
dome-shaped diaphragm 31. When the dome-shaped diaphragm 31 is vibrated, a first resonance
mode is generated, a circle is generated in the dome-shaped diaphragm, and a large peak is
generated in the sound pressure frequency characteristic. Fixing the coil bobbin 33 inside this
portion and performing surface driving eliminates a large peak in the sound pressure frequency
characteristic, and has an advantage that the high frequency reproduction limit frequency
becomes high. The horn speaker according to the present invention is configured as described
above, and according to the present invention, the following effects can be obtained. (1) The
temperature rise of the voice coil can be suppressed, non-linearity is not generated in the output
sound pressure, and the maximum output sound pressure is improved. EndPage: 311 (2) Voice
coil burnout is prevented. Since the dome-shaped diaphragm is supported by the equalizer, the
minute gap between the equalizer and the dome-shaped diaphragm can be set with high
precision and without variation. (4) Since the equalizer is disposed on one side of the domeshaped diaphragm and the magnetic circuit is disposed on the other side, the magnetic flux / x
(magnetic fluid filled in the magnetic gap of the circuit, the coolant jumps out Even if the
magnetic fluid or the coolant is evaporated, the magnetic fluid or the coolant does not enter the
slit of the equalizer, or the minute gap between the equalizer and the one-minute diaphragm, and
the sound pressure is reduced. FIG. 28 иииииииииииииииииииииии section, 3 o и и и и и и и и и и и и и 1 diaphragm, 32 и и и
и и и и и fixed ring, 33-и и и и и
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
иииииииииииииииииииииииииииииииииииииииииииииииииииии иии Plate, 40 и и и и и и и и и Ho /, 42.43 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 fluid , Name of agent Attorney Nakao et
al. 1 person Fig. 2 EndPage: 4 Fig. 3 A, fz 4 Je + Fig. 4 End Page:
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