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JPS55150569

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS55150569
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
speaker, FIG. 2 is a plan view of another conventional speaker, and FIG. 3 is a cross-sectional
view showing a first embodiment of the speaker according to the present invention. Fig. 4 is a
sectional view showing a second embodiment of the loudspeaker according to the present
invention, Fig. 5 is a perspective view of a magnetic circuit portion of the second embodiment,
and Fig. 6 is a loudspeaker according to the present invention 7 is a cross-sectional view of a
fourth embodiment of the loudspeaker according to the present invention, and FIG. 8 is a sound
pressure frequency characteristic of the conventional loudspeaker and the loudspeaker according
to the present invention, harmonic distortion It is a characteristic curve figure which shows a
characteristic. 2: diaphragm, 3: bobbin, 11: center pole, 18: sound absorbing material, 9: good
conductor.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker which
simultaneously suppresses cavity resonance inside a bobbin and reduces distortion of a magnetic
circuit. FIG. 1 shows a conventional speaker. Cap 1 diaphragm in FIG. The hollow portion 14 is
formed by the bobbin & center pole 11. As the diaphragm 2 moves up and down, cavity
resonance occurs at a specific frequency according to the volume of the cavity portion 14)) ↓: /
θ frequency / wave number. As shown in the curve of FIG. 8, this causes rashes in the sound
pressure frequency% a and is harmful for obtaining high-quality reproduced sound. In the
conventional speaker, in order to prevent the deterioration of the sound quality due to the cavity
resonance, the sound absorbing material 18 made of foamed plastic or the like as shown in FIG. 1
is inserted so as not to contact the cap 1 or the bobbin cap. Due to the insertion form, the view of
the sound absorbing material 18 can not be increased, and the foamed plastic has a low density,
so that the cavity resonance generated in the cavity portion 14 can not be sufficiently controlled.
In order to solve the above-mentioned drawbacks, conventionally, as shown in FIG. 2 in the main
VC high-tone speaker, a perforated plate 16 is used to wrap a large amount of a sound absorbing
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material such as glass fiber having a high sound absorption coefficient to improve sound
absorption efficiency, Methods have been taken. In addition, the presence of the voice coil 8 in
the magnetic gap generates harmonic distortion. In order to suppress this distortion, the center
pole 11 is covered with the good conductor plate 9 as shown in FIG. The way was taken. In the
speaker shown in FIG. 2, when taking measures for the above-mentioned high frequency wave
metal formation, the step of press-fitting and fixing the good conductor plate 9 to the center ball
11 and the step of attaching one over the perforated plate 16 center pole 11 Of the two
processes, and the defect that the number of parts increases. It is an object of the present
invention to provide a speaker having a high-performance magnetic circuit which eliminates the
above-mentioned drawbacks of the prior art and takes into consideration the reduction of the
number of parts and the simplification of the working process. In order to achieve the above
purpose, the speaker according to the present invention is formed by forming a holed board with
a good conductive material, and squeezing a high density sound absorbing material inside and
winding around the center ball at the bottom of the holed board at the same time It is something
like that. Hereinafter, a speaker according to the present invention will be described according to
an embodiment. FIG. 3 is a first embodiment of a loudspeaker according to the present invention.
The diaphragm 2 is fixed to the upper part of the povin 3 in which the voice coil 8 is wound at
the lower part, the cap 1 is fixed on the diaphragm 2, the periphery of the diaphragm 2 is an
edge 15, and the bobbin 3 is Each of the frames 6 is supported by a frame tsu = t spider 5 to
constitute a vibration system.
On the other hand, the magnetic circuit sandwiches the magnet 12 from the upper and lower
sides with the front plate 13 and the back plate 10) and creates a magnetic gap with the center
pole 11 and the front plate 13 provided at the center of the pack plate 10 Crowded. The sound
absorbing material 18 is covered with a good conductor plate 9 having a large number of holes
17 in the cavity 14 made by the cap 1 bobbin 3 and the center pole 11, and the lower part of the
good conductor plate 9 is engaged and fixed around the center pole 11. ing. Since the sound
absorbing material 18 is mainly used by compressing a high sound absorbing material such as
glass fiber, the co-sinusoidal resonance generated in the cavity 14 through the hole 17 is
extremely well suppressed. The lower part of the good conductor plate 9 surrounds the center
pole 11 to form a short circuit ring, so that eddy current generated on the surface of the
magnetic pole can be shorted to suppress harmonic distortion. Fig. 8 @ is for preventing cavity
resonance. 壱 ・ No. The sound pressure frequency characteristics after processing, (2) are the
characteristics before processing, and the discontinuities of the sound pressure generated at the
frequency f by the cavity resonance become a smooth connection. Also, in Fig. 1 and 2 are each a
good conductor plate? The amount of second harmonic distortion before and after the insertion
of the conductor is improved, and an improvement of about 1 adB or more is observed by the
insertion of the good conductor plate 9. 4 and 5 show a second embodiment of the loudspeaker
according to the invention. The diameter of the portion of the good conductor plate 9 having the
holes 17 was made smaller than the diameter of the portion engaged with the lower center ball
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11 to make a stepped shape. The press-fit engagement of the good conductor plate 9 with the
center ball 11 is easy by utilizing this stepped portion, and the good conductivity of the
reinforcing ring 19 provided on the inner periphery of the bobbin 3 to prevent the deformation
of the bobbin 3 The body plate 9 does not contact. Although the volume occupied by the sound
absorbing material 18 is smaller in this embodiment than in the first embodiment of FIG. 3, it has
been confirmed that the embodiment is sufficiently effective in the processing of cavity
resonance. FIG. 6 shows a third embodiment of the loudspeaker according to the present
invention. In the present embodiment, the diaphragm 2 has a planar shape, and the upper end of
the bobbin 6 having the voice coil 8 wound on the lower part of −) ′ 5 is fixed to the back
surface of the diaphragm 2. The same attachment portion of the bobbin 5 is a node circle at the
time of resonance of the diaphragm 2, and the piston movement zone of the diaphragm 2 is
expanded by so-called mode driving to provide a high fidelity speaker. The gap between the
diaphragm 2 and the center pole 11 is narrow but the area is wide. In the present embodiment, a
large number of upper entire surface through holes 17 of the good conductor plate 9 are formed,
the periphery of the good conductor 9 is engaged with the center pole piece 11, and the sound
absorbing material 18 is formed by the good conductor plate 9 and the center pole 11.
Sandwiches.
Cavity resonance generated in a narrow gap and harmonic distortion generated in the magnetic
circuit are effectively suppressed together. FIG. 7 shows a fourth embodiment of the loudspeaker
according to the present invention, wherein the diaphragm 2 is a dome-shaped dome speaker
and a large amount of sound absorbing material 18 is covered with a good conductor plate 9
having a large number of holes 17. The lower part of the body plate 9 is wound around the
center pole upper part. The cavity resonance generated between the diaphragm 2 and the center
pole 11 is suppressed by a large amount of sound absorbing material 18 through a large number
of holes 17, and a short circuit term is constituted by a good conductor wound around the top of
center pole 11. As a result, the occurrence of magnetostriction is suppressed. Conventionally, in
order to suppress distortion of the cavity resonance and the magnetic circuit, a large amount of
sound absorbing material is covered with a perforated plate in a certain shape, and separately
from that, the distortion of the magnetic circuit is reduced by a good conductor plate. The parts
required to process the cavity resonance and reduce the distortion of the magnetic circuit were
five points of a large amount of sound absorbing material, perforated plate and good conductor.
In the present invention, since the good conductor and the perforated plate are integrally formed,
the parts become two points of the good conductor and the sound absorbing material, and the
number of parts can be reduced by one point compared to the prior art. It is possible to obtain a
high-performance speaker that provides high quality sound with low cost and suppressed
distortion of cavity resonance and magnetic circuit.
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