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JPS5644298

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DESCRIPTION JPS5644298
Specification l Title of the Invention 2, 41! i # 'F Claim (A ring having a diameter of half or more
of the edge provided in the radial direction from the outer periphery of the edge is provided on
the front surface of the edge provided on the outer periphery of the 11 diaphragm S brush 11
comb 5izy-friend Sveka device.
Speaker device
3. Detailed Description of the Invention The present invention relates to an electrodynamic
loudspeaker and a loudspeaker apparatus having a thick diaphragm on a candle. A so-called
electrodynamic speaker that converts an electrical signal to an acoustic signal includes a nine
diaphragm made of paper, metal or the like, a voice coil attached to the center of this diaphragm,
and a voice coil disposed in a DC magnetic field Then, an alternating current signal is supplied to
the voice coil, and the diaphragm is vibrated to obtain an acoustic signal. The diaphragm used in
this electrodynamic speaker has a conical shape Lc, which has a diaphragm open toward the
radiation side of the acoustic output, and the radiation side is surrounded by the diaphragm.
Space, which is surrounded by the space, i.e., the diaphragm, has a drawback that peaks and
valleys occur in the frequency characteristics due to resonance of the front chamber. Filled with
foam synthetic resin such as expanded polystyrene, expanded polyurethane, expanded
polystyrene, etc. in the space of the cone-shaped diaphragm that alleviates this peak and valley,
making it a conical body and driving the diaphragm with a flat conical front surface And speakers
that emit sound replacement signals are considered. However, even when driving the diaphragm
of a conical body having such a front surface in a flat shape, the edge characteristic is generated
by the edge resonance, the peaks and valleys of the characteristic caused by the reflection from
the edge, the diffraction of the sound wave by the edge portion, etc. Are not satisfied with
sufficient characteristics. The present invention has been made in view of such a point, and an
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object of the present invention is to provide a speaker device with an improved point of the
above-described characteristics that is EndPage: 1. That is, according to the present invention, a
ring is provided on the front surface of the edge in a radial direction from the outer periphery of
the edge portion located on the outer peripheral portion of the diaphragm to apply acoustic load
to the edge. , Edge resonance, characteristic peaks and valleys caused by reflection from the end
of the edge, and improvement in the characteristic sag due to the diffraction 11 of the sound
wave by the end portion. Hereinafter, the present invention will be described in detail with
reference to the drawings. FIG. 1 shows a cross-sectional view of a speaker apparatus according
to an embodiment of the present invention, wherein 1 magnet, 2 constitute a magnetic circuit
with a pole plate, 3 # 'i damper, 4 is a speaker, beaker It is made of paper or metal by a frame
and a five-cone diaphragm. 6 is a filled foam which can be made of foamed synthetic resin such
as expanded polystyrene, expanded polyurethane, expanded polystyrene and the like. また7はエ
ツジ、8Fiボイスコイルである。 On the other hand, a front ring 10 has a projection 11 which
is convex in the direction of the edge 7. This front ring 10 is characterized in that it is shaped to
cover half or more of the edge 7 unlike the conventional paper for fixing the edge.
That is, when such a front ring 10 is provided, when the conical diaphragm 5 with the filling
foam 6 is moved, an acoustic load is applied to the work and shear, and the feature is caused by
the edge resonance and the reflection from the edge. It is possible to improve the characteristic
sag caused by the diffraction of the sound wave by the ridges and edges of the ridges. The
projections 11 provided on the front ring 10 make the air interposed between the front ring 10
and the edges 7 more effective. Although the acoustic load has a role to be effective, it may not
be necessary in some cases. FIG. 2 compares differences in frequency characteristics with and
without the front ring 10 according to an embodiment of the present invention. These frequency
characteristics were measured under the following conditions. That is, the diameter of the unit
used is about 2051, the depth of the conical diaphragm 5 is about 20 II 11, and the internal
volume of the cabinet containing this unit is about 10! And, the method is by the drone cone
method. Characteristic a in FIG. 2 is a frequency characteristic in the case where front / glO is
not attached. In the case of this characteristic, valleys occur around 1.5 KHz, and peaks and
valleys of the characteristic are intense between 2 KH 2 and 101 G (z. The characteristic is the
frequency nature when the front ring IO is attached. In the case of this characteristic, 1.510 (the
valley in the vicinity of z is reduced, and the characteristic between 2 KHz and 10 KH2 is
relatively gently reduced. As can be seen by comparing these characteristics a and
contemplation, the characteristics of b lead to relatively smooth connection when constructing a
multi-way system in combination with a high range unit ing. Also, in the case of implementing
the present invention, it is necessary to guarantee the actual allowable amplitude, which can be
calculated as follows. For example, considering specifically the aperture 20611 of the unit as
described above, when a sound source having P watt acoustic power emits a sound wave into a
half space, the sound at a point 1 m from the sound source The strength is given by That is, r and
al L sound pressure is given by the following equation. p, = VIP6C (INewton / m2)-(21P6a
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density of air, C: speed of sound) The sound pressure level at the point of 1 lm from the sound
source is given by the following equation. However, OdBaPJ, Fir, m, a, and sound pressure are
defined as 2 × 10 ′ microbar = 2 × 10 ′ Nevrton / m 2. Also, the relationship between the
acoustic output P and the displacement X of the diaphragm is expressed by the following
equation% x (, = P6C: natural sound pressure impedance of air EndPage: 2 equation (1) (21 (3)
(4) The relationship between the sound pressure level and the amplitude of the diaphragm at a
distance of 1 m from the sound source at a = 105 ++ and f = 100 Hz is B □ dllaP, when L is 0.12
m in X, 5 odBaP, L It becomes x * t2 when of @ x = 0.37 m, 100 dB 8 and P, L.
In fact, considering that it will be heard in a room of a general household, in the case of the
aperture 205+, it is sufficient to take 2 degrees as an allowable amplitude. Therefore, when the
front ring Io is attached, after ensuring the above-mentioned allowable amplitude, it is possible to
make the acoustic load more sufficient by making it as close to the edge 7 as possible and
covering the wide range of the edge 7 as possible. It is necessary to cover at least half or more of
the length of the edge 7 at least. Furthermore, the effect of the 24I improvement of providing
projections 11 along the edge of the corrugation of edge 7 is made more effective. Further, by
mounting the speaker device according to the embodiment of the present invention as shown in
FIG. 1 such that the front surface of the filling foam 6 and the baffle surface are flush with each
other, j! Since it is possible to construct an imaginary circular plane sound source, the
characteristics can be made close to the designed calculated values. Therefore, there is also an
advantage that unit design is relatively easy. In the above embodiment, the speaker device having
the in-thick diaphragm has been claimed to be effective, but it is needless to say that the front
ring 10 is effective when applied to a conventional cone-shaped speaker. . As described above,
according to the present invention, when an alternate load is applied at edge 7 Kf, peak
resonance of characteristics caused by reflection from K edge, edge resonance, edge of edge,
sound wave 9 diffraction by edge portion, etc. Can reduce the characteristic traits that occur-
4. Brief description of the drawings # I1 Figure 1 shows a speaker device according to an
embodiment of the present invention, and Figure 2 compares the frequency characteristics of a
conventional speaker device using a diaphragm in thickness and an embodiment of the present
invention. It is nine things. 1 magnet, 2 pole plates, 3 dampers, 4 speaker frames, 5 conical
diaphragms, 6 · filled 1'11 bodies, 7. Edge, 8-poise coil, 10-, @ [ring, 11 · · · · · ·. Fig. I EndPage: 3
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