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JPS59296

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DESCRIPTION JPS59296
[0001]
In the industrial application field, the speaker diaphragm, especially a rectangular plate-like body
is bent in a zigzag shape, and developed in an annular shape so that the-side portion is the inner
peripheral surface and the other side is the outer peripheral surface. The present invention
relates to a speaker diaphragm of a sand-inch structure in which a surface material is adhered to
both sides of an annular frame member. The configuration of the prior art and its problems In
general, the speaker diaphragm is a cone type, but the sound source position at the center and
outer periphery of the cone causes a phase difference and the air in the thick cone resonates. The
flat sound pressure frequency characteristic was obtained and there was a drawback that it was
nil. In contrast to this rLvC, a flat plate speaker with a flat diaphragm and sound source position
alignment is advantageous for obtaining a flat sound pressure frequency characteristic without
front chamber effect, but to obtain a flat characteristic over a wide band, divided vibration is A
high stiffness is required to avoid low frequency. Therefore, a flat diaphragm having a sandwich
structure having light weight and high rigidity was considered. Although the Hono-Nikam
structure etc. is adopted as the Santoy-Tuchi structure, the honeycomb structure is complicated
and expensive. Therefore, as shown in FIG. 1, a rectangular plate is bent in a zigzag manner so
that the − side (A side) is the inner peripheral surface and the other side (B 110) is the outer
peripheral surface. A low cost and high rigidity diaphragm has been devised by a sandwich
structure in which the annular surface member 2 is adhered to both sides of the annular frame
member 10 which is annularly expanded. In the diaphragm having this sandwich structure, a socalled node drive system in which the node of the primary resonance of the diaphragm is driven
by a voice coil is used to widen the reproduction band, and flat sound is produced until the
second resonance of the diaphragm. Pressure frequency characteristics are obtained. However, in
the above-described annular frame member 1ff: The diaphragm used often has the drawback of
narrowing the reproduction zone due to distortion due to surface noise of the surface member 2
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or the frame member 1, and the surface member 2 and the frame member There is a problem in
input resistance because the bonding area with 1 is narrow. SUMMARY OF THE INVENTION The
present invention is to solve such conventional defects, and it is a sand having a surface member
joined to both sides of an annular skeleton member which can achieve high rigidity and low
distortion and high input resistance. An object of the present invention is to provide a speaker
diaphragm having an inch structure. The speaker diaphragm according to the present invention
has an annular shape in which a rectangular plate-like body is bent in a zigzag shape, and theside is an inner peripheral surface and the other side is an outer peripheral surface. A surface
material is adhered to both surfaces of the frame member, and a foamable resin is filled between
the surface material and the frame member.
Description of Embodiments Embodiments of the present invention will be described below with
reference to the drawings. FIGS. 2 and 3 show an embodiment of the present invention, and in
FIGS. 2 and 3, an outer diameter 190φ made of aluminum with a thickness of 40 μm is shown.
Ring-shaped surface material with an inner diameter of 76φ, 12 is a skeletal member made of
kraft paper of 60μ 摩 2 friction, 13 is a 60 times foamed polyurethane resin filled with an outer
peripheral portion after bonding the surface material 11 and the skeletal member 12, 14 is An
auxiliary diaphragm obtained by heat-forming a sheet (1oo g / yd) obtained by mixing carbon
fibers using polyethylene synthetic pulp as a base material into a dome shape with an outer
diameter of 76φ and a depth of 6 and joining in the center It is n. Here, the frame member 12 is
a rectangular kraft paper material bent in a zigzag shape, and developed in an annular shape
such that the − side portion is an inner peripheral surface and the other side portion is an outer
peripheral surface. FIG. 4 shows the frequency characteristics when the loudspeaker diaphragm
configured in this way is used as a bass loudspeaker of aperture 26C1N. In FIG. 4, A is a sound
pressure frequency characteristic of a speaker using the speaker diaphragm of this embodiment,
and B is a second-order distortion frequency characteristic of 30 dB of the speaker. Note that for
comparison, the frequency characteristics of a speaker using a diaphragm made of kraft paper of
80 μm thickness as a skeleton member so as to have approximately the same weight as this
embodiment and using a diaphragm having a surface material joined without filling with a
foamable resin It is shown in Fig.4. FIG. 4 shows sound pressure frequency characteristics of a
speaker using the diaphragm of the cH comparative example, and second-order distortion
frequency characteristics indicated by DU3odB. As apparent from FIG. 4, in the speaker using the
diaphragm of this embodiment, the second-order distortion in the high region is smaller by about
30 dB as compared with the comparison product, and the network is There is an advantage that
it can be omitted. In addition, since the buckling stress of the diaphragm is increased by the
filling of the foamable resin, and the distortion is hardly increased even at high input, the effect
of increasing the input resistance is also obtained. As described above, according to the present
invention, a rectangular plate is bent in a zig-zag shape, with the-side portion as the inner
peripheral surface and the other side as the outer peripheral surface. Since the surface material is
adhered to both sides of the annular frame member expanded annularly and the expandable
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resin is filled between the surface material and the frame member, the buckling stress of the
diaphragm itself is increased and the rigidity is increased. Thus, input resistance can be improved
without an increase in distortion at high input. In addition, since second order distortion in the
high frequency region is reduced, the reproduction bandwidth of the speaker system can be
expanded, which has the advantage of simplifying the network.
[0002]
Brief description of the drawings
[0003]
1 is a partially cutaway plan view of the conventional speaker diaphragm, FIG. 2 is a partially
cutaway plan view of the speaker diaphragm of the present invention, FIG. 3 is a sectional view of
the same diaphragm, and FIG. It is a comparison figure of the frequency characteristic of the
speaker diaphragm of this invention, and the conventional diaphragm for speakers.
11 · · · · · Surface material, 12 · · · · · · · · · · · · · · · · · · · · · · · · · foamable resin. Name of Agent
Attorney Nakao Toshio Other 1 person Figure 2 Figure 3 Note 4
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