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JPS5815399

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DESCRIPTION JPS5815399
[0001]
The present invention relates to an electrodynamic speaker that enables reproduction of the
entire band from Uno to tweeter using a flat diaphragm, and the object of the invention is to
improve the high-frequency characteristic and obtain a flat sound pressure frequency. An object
of the present invention is to provide an electrodynamic speaker capable of obtaining
characteristics. In general, an electrodynamic speaker that enables reproduction of the entire
band using a flat diaphragm is configured as shown in FIGS. 1 and 2. In FIG. 1 and FIG. 2, 1 is a
circular plane diaphragm, 2 is a circular plane diaphragm having a hole at the center, and these
plane diaphragms 1 and 2 have a single plate shape of a no-Nicham structure. Surface materials
are attached to the upper and lower surfaces of the core material. The flat diaphragm 1 is
disposed in a hole at a central portion of the flat diaphragm 2, and the outer periphery thereof is
supported by the flat diaphragm 2 by an edge 3. The outer periphery of the flat diaphragm 2 is
supported by the frame 4 by the edge 4. 12 is a lower plate integrally formed with a center ball
13 at the center, 11 is an annular magnet fixed on the lower plate 12, and 10 is an annular grate
fixed on the magnet 11, which are the above The inner peripheral surface of the play 10 and the
magnetic circuit are fixed to the bottom of the frame 14. Reference numeral 7 denotes an
annular bobbin around which the voice coil 8 is wound. The voice coil 8 is disposed in the
magnetic gap of the magnetic circuit by being supported by the frame 14 by the damper 9. The
planar diaphragms 1 and 2 have circular nodes A and B, respectively, in the first resonance mode
as shown in FIG. The flat diaphragm 1 is provided with a conical drive cone 6 at its circular node
A, and the bobbin 7 is connected to the root of the drive cone 6. The flat diaphragm 2 is provided
with a conical drive cone 6 at its circular node B, and the bobbin 7 is connected to the root of the
drive cone 6. Therefore, the flat diaphragm 1.2 is joint-circle driven with the voice coil 8 wound
around the wedge pin 7 in common. The planar diaphragms 1 and 2 can expand the
reproduction band up to the second resonance frequency and integral frequency by driving the
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nodes of the first resonant mode, and the planar diaphragm 1 ░ The resonance frequency of 2 is
determined by the size of the diaphragm itself. Therefore, the primary resonance frequency of
the flat diaphragm 1 is f1% and the secondary resonance frequency is f2, and similarly, the
primary resonance frequency of the flat diaphragm 2 is f 2 and the secondary resonance
frequency is f2 '. given that.
There is a relationship of f, '<f2I <fl <f2. Further, by suitably selecting the material and material
thickness of the driving cone 6, driving from the voice coil 8 to the flat diaphragm 2 is performed
at a second resonance frequency f2 'or more of the flat diaphragm 2. Please configure it to shut
off the force mechanically. The edge 3 connecting the flat diaphragms 1 and 2 has its compliance
set large. Therefore, in the above-described electrodynamic speaker, the flat diaphragms 1 and 2
integrally vibrate up to the second resonance frequency f2 'of the flat diaphragm 2 and the flat
sound pressure is flat as shown in FIG. In the band above the second resonance frequency f2 'of
the flat diaphragm 2, only the flat diaphragm 1 vibrates, and the flat sound pressure shown in
FIG. 3 can be obtained. However, in the above-described electrodynamic loudspeaker, only the
flat diaphragm 1 vibrates in a band higher than the second resonance frequency f2 'of the flat
diaphragm 2, and the radiation area of the flat diaphragm 1 is small as shown in FIG. As a result,
there is a problem that the sound pressure 75 drops to a resistance and becomes a stepped
characteristic. In order to prevent this stepped characteristic, it is sufficient to reduce the mass of
the flat diaphragm 1, but in this case, the rigidity of the flat diaphragm 1 is reduced and the first
and second resonance frequencies f1jf2 are reduced. As a whole, there is a problem that the
reproduction band becomes very narrow. The present invention solves the above-mentioned
problems, and one of the present invention will be described with reference to the drawings of
the embodiments. FIGS. 4 and 6 show an embodiment of the electrodynamic speaker according
to the present invention, and the same reference numerals in FIGS. 1 and 2 denote the same
elements. In FIGS. 4 and 6, reference numeral 19 denotes a sand-inch structure having a core 2
░ in which 71 cocom shaped cells expand radially from the center toward the outer periphery
and surface 21 ░ 22 provided on the upper and lower surfaces of the core 2o. The central
portion of the upper and lower surface members 21. 22 is removed in a circular shape, and the
core member 20 is left at the central portion. The flat diaphragm 19 has a first resonance
frequency f, 'and a second resonant frequency f2', and operates in the same manner as the flat
diaphragm 2 of FIGS. 1 and 2 described above. is there. The flat diaphragm 19 is provided with a
conical drive cone fl3 at the circular node B in the first resonance mode, and the drive cone ? 38
is attached to the voice coil bobbin 7 having the voice coil 8 at its root. It is connected. On the
other hand, the flat diaphragm 19 has a ring-shaped spacer 16 bonded to the central opening
from which the upper and lower surface members 21. 22 have been removed, and a conical cone
diaphragm through an edge 16 under the spacer 16. A corner 17 of the cone diaphragm 17 is
connected to a voice coil bobbin 7 having a voice coil 8 at its root.
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A dome diaphragm 18 is attached to the top of the voice coil bobbin 7. Here, the driving cone 23
is made of a material that mechanically shuts off the driving force from the voice coil 8 to the
planar vibration plate 1 e at the second resonance frequency f 2 ? or more of the planar
vibration plate 19, The material thickness is appropriately selected, and the edge 16 is set to a
large degree of compliance. In the electrodynamic speaker of such a configuration, by passing a
current to the voice coil 8, the voice coil 8 performs a piston motion in the magnetic gap of the
magnetic circuit, and the flat diaphragm 19 and the cone diaphragm 17. The dome diaphragm 18
is simultaneously driven. As a result, it has the sound pressure frequency characteristic shown in
FIG. That is, in order to drive the circular node of the first resonance mode of the flat diaphragm
19, the cone diaphragm 17 and the dome diaphragm 18 integrally vibrate up to the second
resonant frequency f2 'of the flat diaphragm 19. Sound pressure characteristics. Further, only the
cone diaphragm 17 and the dome diaphragm 18 vibrate in the second resonance frequency f2
'or more of the plane diaphragm 19 and the sound radiated from these diaphragms 17.18 is the
plane vibration. It is regenerated through the central opening of the plate 19. The cone
diaphragm 17 and the dome diaphragm 18 can be made much lighter than the flat diaphragm 1
described in FIGS. 1 and 2 and can maintain rigidity by the shape effect. Since the surface can be
expanded, flat characteristics can be obtained up to the high frequency without reducing the
sound pressure. FIGS. 7 and 8 show other embodiments of the electrodynamic speaker according
to the present invention, and those with the same reference numerals as in FIGS. 1 and 2 are the
same as in FIGS. 1 and 2, respectively. Shows the components of. In FIG. 7 and FIG. 8, reference
numeral 24 denotes a short-shaped flat diaphragm having a sand-inch structure comprising a
non-Nickam core 26 and surface members 26. 27 provided on the upper and lower surfaces
thereof. The central portion of the material 26.27 is removed in an elliptical shape so that the
core material 26 is left at the central portion. The flat diaphragm 24 has first and second
resonant frequencies f and l and a second resonant frequency f2 ', and functions in the same
manner as the flat diaphragm 1 of FIGS. 1 and 2 described above. The planar diaphragm 24 is
provided with a substantially V-shaped drive cone 28 at two straight nodes C and C in the first
resonance mode, and the voice coil bobbin 7 having the root ravo voice coil 8 is attached thereto.
It is connected.
On the other hand, the flat diaphragm 24 is provided with an elliptical spacer 29 at the central
opening from which the upper and lower surface members 26.27 are removed, and the elliptical
cone diaphragm 31 is formed below the spacer 29 through an edge 30. The cone diaphragm 31
is connected to a voice coil bobbin 7 having a voice coil 8 at its root. Further, a dome diaphragm
18 is provided above the voice coil bobbin 7. Here, the drive cone 28 is configured to
mechanically cut off the driving force from the voice coil 8 to the flat diaphragm 24 in the band
higher than the second resonance frequency f2 'of the flat diaphragm 24, and the edge 30 The
set is a good match for the cover 0's. Even in the case of the electrodynamic speaker configured
in this manner, the cone diaphragm 31 and the dome diaphragm 18 vibrate in a single line at the
second resonance frequency f 211 of the plane diaphragm 24 as in the above embodiment, and a
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flat sound is produced. It becomes a pressure characteristic. Furthermore, in the band above the
second resonance frequency f2 ', the radiation is emitted from the cone diaphragm 31 and the
dome diaphragm 18 through the gap of the core 24 from the central opening of the flat
diaphragm 24 excluding the surface 26 ░ 27. The sound is played back. The cone diaphragm 31
and the dome diaphragm 18 can be made much lighter than the flat diaphragm 1 described in
FIGS. 1 and 2, and the shape effect can be maintained, so that the sound document can be
enlarged. Because you can. Flat characteristics can be obtained up to the high frequency without
reducing the sound pressure. In the above embodiment, the upper and lower surface materials
are removed leaving the core of the central portion as the planar diaphragm, and the central
portion of the diaphragm is provided with a hole through which the sound radiated from the
cone diaphragm passes. The plate may be an annular plate from which the upper and lower
surface materials have been removed, including the central core material. In this case, instead of
the cone diaphragm, a dome diaphragm may be provided so as to protrude in the central portion
of the flat diaphragm, and the voice dome diaphragm 7 can be made in the voice coil position.
Even when using a flat diaphragm in which the upper and lower surface materials having holes
in the center part are wound around the core material and holes are provided in the center part,
the dome diaphragm 18 is omitted and the high pressure is not reduced. Flat characteristics can
be obtained. Needless to say, the cone diaphragms 1T and 31 may be used instead of the dome
diaphragms, respectively. As described above, according to the present invention, a hole is
provided at the central portion of the planar diaphragm, and a drive cone is provided at the node
of the first resonance mode of the planar diaphragm, and a central opening of the planar
vibration plate is provided. A cone diaphragm or dome diaphragm is provided in a portion close
to the provided hole, and both diaphragms are configured to be simultaneously driven by a voice
coil, so that the sound pressure frequency is flat up to the high region without a drop in the
sound pressure. It has the advantage that characteristics can be obtained.
[0002]
Brief description of the drawings
[0003]
1 is a top view of a conventional electrodynamic speaker, FIG. 2 is a cross-sectional view of the
same speaker, FIG. 3 is a sound pressure frequency characteristic diagram of the same speaker,
and FIG. 4 is an embodiment of the present invention. 6 is a cross-sectional view of the same
speaker, FIG. 6 is a sound pressure frequency characteristic diagram of the same speaker, and
FIG. 7 is a top view of an electrodynamic speaker showing another embodiment of the present
invention 8 is a cross-sectional view of the same speaker.
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plate. Name of agent Attorney Nakao Toshio and others 1 person Figure 1 Figure 3 Shoulder bag
Chichi 4 Figure 5 Figure 6 I think R Chiri
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