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JPS5580997

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DESCRIPTION JPS5580997
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a broadband speaker in
which nodes of divided vibration of a flat diaphragm are driven. Conventional cone-shaped
loudspeakers are often used for obtaining a wide piston area because the cone shape is
structurally strong. However, the dip on the sound pressure-frequency characteristic was caused
by the cone-shaped dent effect. On the other hand, the following is put to practical use as a flat
diaphragm. One is to drive the central part of the flat diaphragm, and the peak and dip due to the
generated divided vibration are left as it is. The magnets are arranged in parallel, and the leakage
flux is used to drive a coil printed on a thin-foiled flat diaphragm. The former was not used for
H1-Fi because many peaks and dips were generated on the sound pressure-frequency
characteristics. The latter was able to obtain a flat sound pressure frequency characteristic, but
could not obtain a structurally large amplitude, and was used as a high-tone speaker. As
described above, the conventional loudspeaker is a cone-shaped loudspeaker having a dip due to
the dent effect due to the cone shape on the sound pressure-frequency characteristic, and a flatplate loudspeaker is not for Hl-Fi or limited. It has the disadvantage of the barrel which can be
used only in the used zone of use. FIG. 1 shows a cross section of a conventional cone-shaped
speaker, in which (1) is a cone-shaped diaphragm, (2) is a voice coil for driving the same, and (3)
is a diaphragm (11). (4) is connected to the voice coil (2), and has a function to improve the
linearity of the diaphragm (1) and the voice coil (2) EndPage: 1 (2). (5) is a magnetic circuit unit
for driving the voice coil (2). In the cone-shaped speaker configured in this way, a large piston
imaging area can be obtained because the rustiness of the cone shape itself is large. It has a
shape as shown in FIG. 2 (Ra ′ ′ jOci, Rb = 4 cm. RaR1 = dish, α = 55 °) Diameter 25 儒 (here,
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diaphragm radius a−10 crr L). Axisymmetric primary division vibration frequency f1 of the
cone-shaped speaker) becomes, and as a constant of a typical natural fiber, Young's modulus E =
1 × 10 10 dy r 1 e / c WL 2 density p = as g / cra 3 t! -Constants in the m2 diagram (! ) If you
substitute in the expression f? −’800. H2となる。 (We ignore the influence of the edge
here).
Moreover, since the drop on the sound pressure-frequency characteristic due to the concavity
effect of the cone occurs when ka = 2πa / λ is 2 to 3, the drop occurs from around 100 OHz
which is the use band. (Where: phase constant λ: wavelength). The central portion is driven by a
flat diaphragm having 7. In FIG. 3, (1) is a flat diaphragm, (2) is a voice coil% for driving this (3)
is an edge for supporting the diaphragm (1), (4) is a voice coil (2) (5) is a magnetic circuit unit for
driving the voice coil (2), which is connected to and serves to improve the linearity of the
diaphragm (1) and the voice coil (2). このよう? The axisymmetric primary division vibration
frequency of the flat-plate speaker configured as described above can be approximately obtained
from a circular plate that is free at the periphery. Same constant thickness as a cone speaker.
Substituting t-11 HII into equation (2) results in s, f + = 80 Hz. Accordingly, the axisymmetric
primary resonance frequency of the flat diaphragm using the conventional paper made of natural
fiber is considerably lower than that of the conical diaphragm i. In recent years, one having a
high Young's modulus / density as in a honeycomb structure has been made, and in order to
obtain the same weight as the above-mentioned corn paper, it is possible to obtain a thickness of
about 3 .mu.m. Here, using 0.1 g of GFRP (glass fiber reinforced plastic) as a skin and using 3
battles of aluminum as a core, E / ρ = 1.8 × 10, t = 0. 32 at that time (2) Substituting in the
equation, fl = 700 Hz. Even a flat plate speaker using this honeycomb structure diaphragm has a
resonance frequency as low as half that of a conventional cone-shaped speaker using a paper
cone. As described above, the conventional cone-shaped speaker can obtain a wide frequency
band due to the cone shape, but a large dip occurs on the sound pressure-frequency
characteristic due to the dent effect, and even a flat plate speaker is flat. Driving the central
portion of the diaphragm has the disadvantage that a wide reproduction band can not be
obtained. An object of the present invention is to provide a speaker having a flat sound pressurefrequency characteristic which can not be obtained by a conventional speaker and a wide
reproduction band.
スピーカ
The present invention will be described in detail below. That is, in FIG. 4 (5), (1) is a flat
diaphragm and the diaphragm of FIG. 3 (the core is formed of a honeycomb structure like li, and
the skin is formed of GFRP. (2) is a voice coil, (3) is an edge supporting the diaphragm (1), (4) is
connected to the voice coil (2) t, and the linearity of the diaphragm (1) and the voice coil (2) The
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spider has a role to improve, (5) is a magnetic circuit unit that drives the voice coil (2), (6) is
joined to the node of the primary division vibration of the flat diaphragm (1), and the voice coil
(2) Is a cone-shaped diaphragm that transmits the driving force of In the speaker configured as
described above, since the nodes of the axisymmetric primary divided vibration of the flat
diaphragm are driven by the cone-shaped diaphragm, the primary divided vibration does not
occur. The first split vibration is second-order conformal, and if the GFRP constant is substituted
into the equation of second-order split vibration, it becomes as follows. Therefore, according to
the embodiment of the present invention (in FIG. 4, the degree of .lamda..quadrature. @ (6)
EndPage: 2 is about 2 times as large as that of a cone-shaped speaker using a conventional paper
cone to obtain a piston vibration area Can. Moreover, in the loudspeaker of FIG. 4, the dip on the
sound pressure-frequency characteristic due to the cone-shaped dent effect which has occurred
in the cone-shaped loudspeaker can be easily eliminated. FIG. 5 shows sound pressure-frequency
characteristics of a conventional cone-shaped speaker (using natural fibers), a flat plate-shaped
speaker (using a honeycomb diaphragm made of GFRP), and a speaker according to an
embodiment of the present invention (FIG. 4). (A) A comparison of (b) and (c) shows that the flat
loudspeaker according to the present invention has flat and wide sound pressure-frequency
characteristics. FIG. 6 shows another embodiment using a cone-shaped diaphragm joined to the
node of the primary divided vibration of the flat plate-like moving plate based on the
embodiment of the present invention. Fig. 6 (a) shows a no nikham structure diaphragm (1). It is
formed by joining cone paper (6) using natural fibers, and has a cone shape, and also has a
sufficient strength even with a paper cone due to the outer diameter of about 60% of the flat
diaphragm. In No. 61), a honeycomb structured cone-shaped diaphragm (6) is used as the
honeycomb structured flat diaphragm (1), and a high-performance speaker that is strong against
non-axially symmetrical vibration can be obtained. FIG. 6 (C) is a honeycomb structure plate
diaphragm including a honeycomb structure cone-shaped diaphragm + 61 in which holes (6a) for
air removal are formed in the honeycomb structure plate diaphragm, and the back pressure of
the plate diaphragm m is It is for the purpose of removing the adverse effect of back pressure on
the sound quality of the speaker due to the escape.
FIG. 6) is the one in which the node-shaped honeycomb diaphragm (6) of the first divisional
vibration of the ring-shaped honeycomb structured flat diaphragm fil is attached, and the shiff 51
is also a ring-shaped honeycomb structured flat diaphragm It is a coaxial speaker with a highpitched speaker mounted on the inner diameter side. As a matter of course, the materials and
shapes of the diaphragms described in FIG. 6 (a) to (6) can be appropriately combined according
to the purpose. As mentioned above, the speaker of the present invention. There is no dip on the
sound pressure-frequency characteristics due to the dent effect that has occurred in the cone
shape, and there is an effect that it is possible to obtain a reproduction band equal to or more
than a speaker using the cone shape.
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4. Brief description of the drawings FIG. 1 is a cross-sectional view of a conventional cone-shaped
speaker, FIG. 2 is a cross-sectional view of a cone-shaped diaphragm, FIG. 3 is a cross-sectional
view of a conventional flat-plate speaker, and FIG. FIG. 5 is a cross-sectional view of a speaker
showing one embodiment of the invention, FIG. 5 is a sound pressure-frequency characteristic
diagram of the speaker, and FIG. 6 is a key surface view showing another embodiment of the
present invention. In the figure, (J) is a diaphragm and (2) is a voice coil. 3) is an edge, (4) is a
spider, (5) is a magnetic circuit unit, and (6) is a diaphragm. In the drawings, the same reference
numerals denote the same or corresponding parts. Agent Atsushi Shino-Fig. 1 3 EndPage: 3 Fig. 2
Fig. 3 Fig. 4/4) 8♀ 3 Involvement S 3 □ ヤ [0 コ イ Koi-Heart EndPage: 4
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