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JPS57115795

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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 JPS57115795
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of a
conventional loudspeaker, FIG. 3 is a sound pressure frequency characteristic diagram of the
same loudspeaker, and FIG. 4 is a cross-section of the loudspeaker according to one embodiment
of the present invention. Fig. 5 is a cross-sectional view of the main part of another embodiment
of the present invention, Fig. 6 is a diagram showing the relationship between the voice coil
aperture and the total thermal resistance, and Fig. 7 is another embodiment of the invention. It is
sectional drawing of the principal part of. 1 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
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ииииииииииииииииииииииииииииииииииииииииииииииииииииии .... Connection body, 18 .....
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subwoofer with
a small diameter diaphragm, 1 ░, 7 '7 y-12 force, while driving the nodes of the primary
resonance of the diaphragm while having high input resistance And a speaker capable of
reproducing high output sound pressure. 1 and 2 each show a conventional speaker using a flat
diaphragm. In FIG. 1 and FIG. 2, 1 is a yoke Z13 integrally formed with a center pole 2 is an
annular magnet fixed on the yoke 1, 4 is an annular plate fixed on the magnet 3, An annular
magnetic gap is formed between the inner peripheral surface of the plate 4 and the outer
peripheral surface of the center pole 2. Reference numeral 5 denotes a frame fixed on the plate 4
and 6 denotes a circular flat diaphragm having a honeycomb sand-inch structure. The diaphragm
6 is supported by the frame 6 through an edge member 7. An annular reinforcing member 8 is
adhered to the lower surface of the diaphragm 6, and the reinforcing member 8 is adhered to a
position of a nodal circle formed on the diaphragm 6 by the primary resonance of the diaphragm
6. The symbol "M" indicates the primary resonance mower) of the diaphragm 6. In FIG. 1,
reference numeral 9 denotes a coil bobbin having a diameter 162 substantially the same as the
diameter of the nodal circle of the first resonance generated in the diaphragm 6, and the upper
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end of the coil bobbin 9 is fixed to the reinforcing member 8. . 9 'in FIG. . ??????????
? Ia, -71. The large diameter end of the drive cone 10 is fixed to the reinforcing member 8, and
the coil bobbin 9 'is fixed to the small diameter end. In FIGS. 1 and 2, 11 is a voice coil wound
around a coil bobbin 9.9 ', and this voice coil 11 is disposed in the magnetic gap portion. ???
???????? As shown in FIGS. 1 and 2, when the driving force induced in the voice coil 11
is driven through the coil bobbin 9 or through the coil bobbin 9 'and the drive cone 10, the
inside of the cylinder of the diaphragm 6 is driven second The reproduction band is expanded to
one next resonance frequency. In FIG. 3, a represents the one-pressure characteristic of the
conventional loudspeaker-[-]. B in FIG. 3 is smaller than the nodal circle in the conventional
example 5 shown in FIG. 28-1 and FIG. As shown in FIGS. 1 and 2, while the sound pressure
frequency characteristic when using the 111163 sana coil bobbin 9 or the drive cone 10 is
shown, a peak occurs at the first resonance frequency f1 and the reproduction band is narrow.
When the node circle of the diaphragm 6 is driven, the peak at the first resonance frequency f1
does not occur, and the reproduction band is expanded to the second resonance frequency f2.
In the present invention, as in the above-mentioned prior art, the node of the diaphragm is not
the same as or larger than the coil bobbin / 9. The present invention is intended to provide a
speaker having a smaller nodal circle of a diaphragm smaller than a coil bobbin to enable nodal
driving and provide a speaker with high input resistance and high output sound pressure.
Description will be made with reference to FIG. In FIG. 4, 13 is a circular flat diaphragm having a
small diameter, 14 is a coil bobbin having a diameter larger than the diameter of a nodal circle
generated in the first resonance of the diaphragm 13, and this coil bobbin 1.4 The voice coil 15
is wound around it. 16 is a truncated cone-like connecting cylinder, and the diameter -164 ░ of
the small end of the connecting cylinder 16 is substantially the same as the diameter of the nodal
circle in the first resonance of the diaphragm 13, and this connection is The small diameter end
portion of the cylinder 16 is fixed inside the cylinder of the diaphragm 1'3. In addition, ream 5 yo
160 'ship, i. ???????? ????? FIG. 5 shows another embodiment of the present
invention. In this embodiment, the connector 17 having a shape in which the connecting cylinder
16 and the coil bobbin 14 in the above embodiment are integrally formed is used. FIG. 7 shows
still another embodiment of the present invention, in which a recess 18 in which the coil bobbin
14 is fitted is formed at the large diameter end of the connecting cylinder 16. Recent advances in
transistors make it possible to easily obtain high-power amplifiers, and create new music fields
using synthesizers, etc., especially for speakers with high frequencies, high input resistance and
high output Is required. However, the heat of the voice coil is what determines the limit of the
high input resistance of the speaker ', and when the thick input is turned on, the voice coil)
power burning is cut off. It is necessary to keep the temperature rise of 11 ? 156 low. As the
relationship between the voice coil diameter Dp and the total thermal resistance R is shown in
FIG. 6, when the voice coil diameter decreases, the total thermal resistance R, becomes large.
That is, if the voice coil diameter is small, the heat will not escape even with a small input, so the
temperature rise will be large. In FIG. 6, hv is the winding width of the voice coil, and it is the
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characteristic when the thickness of the plate is equal to the winding width of the voice coil.
Therefore, to design a speaker with high input resistance, it is necessary to increase the voice coil
aperture. The conventional flat loudspeaker has a voice coil aperture smaller than the diameter
of the nodal circle. In addition, the diameter of the diaphragm of the high-pitched speaker (Zu-t)
was small due to the restriction of the directional characteristics of the diaphragm, and so the
voice coil aperture was also small.
In the present invention, as described above, since the diameter of the voice coil is large, high
input resistance can be obtained and high output sound pressure can be obtained), and the inside
of the primary resonance portion of the diaphragm is driven to 1QG to complete reproduction. It
has the advantage of expanding the bandwidth. In the above embodiment, a circular flat
diaphragm is used. However, in the present invention, a node is generated due to resonance, such
as a diaphragm having a non-uniform thickness, or a diaphragm having a non-uniform thickness.
It can apply to the speaker which drives and expands a zone.
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