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JPS5912690

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DESCRIPTION JPS5912690
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat diaphragm for a loudspeaker of a flat loudspeaker used for acoustic equipment such as a
television receiver and a tape recorder with a radio receiver. Configuration of the prior art and its
problems In general, the speaker diaphragm is formed by forming paper pulp into a paper, and
the diaphragm has a cone shape. In the case of a speaker using these diaphragms, the position of
the sound source does not exist between the inner and outer peripheral portions of the
diaphragm, so that a spill force having a flat sound pressure frequency characteristic is obtained,
which has a disadvantage such as being difficult to obtain There is. In contrast to the abovementioned speakers, a flat plate speaker in which the position of the sound source is aligned with
the diaphragm as a flat surface is advantageous in terms of flattening of the sound pressure
frequency characteristic, and further, a television receiver, a radio receiver, a cassette tape
recorder, etc. Loudspeaker mounting has started to be developed for the purpose of expanding
the vibration area by effectively using the limited space as a speaker to a device with a limited
area. In the case of these flat diaphragms for speakers, simply making the diaphragm shape into
a flat plate has low rigidity to bending and is likely to cause split vibration, making it difficult to
obtain flat frequency characteristics over a wide band. Then, as a means to solve these problems,
as shown in FIG. 1, a rectangular flat diaphragm in which expanded polystyrene and plastic foam
are used for core material 1 and surface material 2 such as aluminum foil is adhered on both
sides of core material 1 is used. It is done. However, in the case of a diaphragm using foam
throughout the core, it has advantages such as relatively low cost and good productivity, but
particularly in the case of a small flat diaphragm, it is necessary to reduce the thickness of the
core. However, since the foam must be cut with a hot wire or the like, the cut surface of the foam
is shrunk due to heat at the time of cutting, resulting in the same reduction in the expansion ratio
as the weight increases. Therefore, it had the fault that efficiency fell. On the other hand, a flat
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plate diaphragm having a core member 3 having a conventional aluminum honeycomb structure
capable of obtaining high bending rigidity as shown in FIG. 2 has a drawback that the
manufacturing process is high because the processing steps are complicated. In the case of
bonding the surface material to the surface material, the foil thickness of the surface material is
lowered to reduce the weight, but bonding is performed by a heat press etc., but there is
unevenness sealed in the core shape. The shape of the core has the disadvantage that it shrinks
onto the surface material due to air shrinkage after bonding to the surface material. SUMMARY
OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks,
and a thermoplastic resin film is used as a core material having a convex-concave rib formed by
press molding and the like, and 7 rungs are provided on the outer periphery to cut off It is an
entire object of the present invention to provide a speaker diaphragm which can solve the
difficulty in bonding the surface material to the core material, which is caused due to stiffness.
The flat diaphragm for a speaker according to the present invention has a thermoplastic resin
film which has concavo-convex ribs radially by press molding or the like and has a flange on the
outer periphery thereof, and the surface material is adhered, and the adhesive thereof There are
provided small holes for drying. According to such a configuration, the shape of the core of the
flat plate diaphragm is formed by using a thermoplastic resin film (such as a polymer film) to
form a rib having irregularities radially by press molding or the like, and further, a flange is
formed on the outer periphery of the core. It is possible to improve the strength in the
longitudinal direction and the lateral direction of the diaphragm and to obtain a flat sound
pressure frequency characteristic up to the high frequency by forming into a shape provided
with. Also, by providing a flange on the outer periphery of the core, when cutting the core to a
required size, cutting is easy using a conventional cutting press or the like because the cut
surface is flat, and productivity Heart shape suitable for Furthermore, when the core material and
the surface material are adhered (when a solvent type adhesive is used), if there is an unevenness
sealed in the core material shape, there is a problem that the solvent is difficult to dry, but the
radial The air hole 'km is provided on one side surface (convex part) of the flat-plate core
material provided with the uneven rib on the outer surface, and the surface material is first
adhered with the surface provided with 7 runes on the outer periphery. By sticking the surface
material on one side (convex portion) provided with the holes, the problem that the solvent is
difficult to dry can be solved. Furthermore, as a means for solving the problem that the solvent is
difficult to dry, a small hole is provided on the side surface (convex portion) side of the radial
uneven rib after the diaphragm is formed, and a rectangle without a sealed portion in the
diaphragm. This can also be solved by using a flat diaphragm. DESCRIPTION OF THE PREFERRED
EMBODIMENTS The flat diaphragm for a speaker of the present invention will be described
below with reference to the drawings. FIG. 3 shows an embodiment of the flat diaphragm for a
speaker according to the present invention. In FIG. 3, 4 is a flat core material, and this core
material 4 is press-formed and vacuum-formed. The thermoplastic resin film is formed by means
of pressure forming or the like, and has ribs 4 'and 4 "having a concavo-convex shape in the
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radial direction, and is provided with a flange 4' '' on the outer periphery. After the flat core
material 4 is formed by molding, as shown in FIG. 4, the light metal foil or the light metal foil
having relatively high extensibility on both sides of the core material 4 having the uneven ribs 4
/ and 4 / 'radially. The diaphragm 6 for a rectangular flat-plate speaker can be created by
attaching the surface material 55 'made of polymer film or the like. Since the diaphragm for the
rectangular flat speaker as prepared in this way can be manufactured by the process of adhering
the surface material 5.5 "iz to the both sides of the core material 40 on which the film is formed,
it has the advantage of high productivity and low cost. In addition, when the core material is cut
to the required size by providing the flange 4IN-f on the outer periphery of the core material, the
cut surface is flat, so cutting using a conventional cutting press etc. It has the advantages of
being easy to do and suitable for productivity.
Here, in the case of using a solvent type adhesive when bonding the core 4 and the surface
material 5.6 ', if there is unevenness sealed in the shape of the core, there is a problem that the
solvent is hard to dry. . 3 Therefore, as shown in FIG. 5, air holes 7 are provided on one side
(convex portion) 4 ′ ′ of the flat plate-shaped core 4 provided with the uneven ribs 4 ′ and 4
′ ′ radially, first of all, 7 rungs on the outer periphery After bonding the surface provided with
the 4 ′ ′ ridge (direction b) to the surface material 6 and drying the solvent from the air hole
7, the surface material 6 ′ is attached to the one side provided with the air hole (direction C).
ing. This solves the problem. Furthermore, as a means for solving the problem that the solvent is
difficult to dry, after the diaphragm is formed, the small holes 8 are provided on one side (convex
portion) 4 "side of the radial uneven rib as shown in FIG. It is possible to form a hole through the
material 5 'and the core 4, which eliminates the part sealed in the diaphragm and allows the
solvent to be easily dried. The hole passing through the surface material 6 'and the core material
4 is good only on the side of the voice coil 9 attachment, and does not affect the diaphragm
surface at all when the speaker is incorporated. Besides this, it is conceivable to provide an air
hole 10 on the side of the core as shown in FIG. The flat diaphragm for a speaker according to
this embodiment can reduce the weight of the diaphragm, and as shown in FIGS. 8 and 9, it can
be seen that the bending strength in the longitudinal direction and the bending strength in the
lateral direction are obtained. E can be made to be the same degree, and strength can be made to
be the same degree as the conventional honeycomb shape. As a result, as shown in FIG. 10, it is
possible to obtain a speaker characteristic with high efficiency and improved high frequency
reproduction frequency characteristic. In FIG. 10, F is the speaker characteristic of the present
embodiment, and G is the characteristic when the conventional foam is used as the core material.
The characteristics shown in FIG. 10 are obtained by evaluating and producing a loudspeaker as
shown in FIGS. 11 and 12 using the flat plate diaphragm. FIG. FIG. 12 shows a top view and a
cross-sectional view of the prototype small rectangular flat plate speaker as viewed from the side.
In FIG. 11, reference numeral 6 in FIG. 11 denotes the flat diaphragm of the present embodiment
described above, and the outer periphery thereof is supported by the frame 12 via the edge
member 11. And, as shown in FIG. ヨーク14. A magnetic circuit composed of the center ball
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15 is attached, and the voice coil 9 supported by the damper 16 is directly bonded to the
position of a node produced on the flat diaphragm 6.
Further, as the reason why the center of the radial concave and convex rib is shifted to one side
from the center of the diaphragm in FIG. The diaphragm strength is to be further improved by
making the center of. Effects of the Invention As described in detail above, according to the
present invention, the surface material is adhered to both sides of a flat core material having a
thermoplastic resin-like radial unevenness and having seven rungs on the outer periphery, and
Since the small holes for drying the adhesive for adhesion are provided, I) for the adhesion of the
surface material to the flat core material through the small holes I) can be fully dried, which is an
advantage that mass productivity can be further improved It is possessed.
[0002]
Brief description of the drawings
[0003]
1 and 2 are partially cutaway perspective views of a conventional flat diaphragm for a speaker,
FIG. 3 is a plan view showing an embodiment of the flat diaphragm for a speaker of the present
invention, and FIG. 4 is the same diaphragm FIG. 5 is an enlarged perspective view of an essential
part of the same diaphragm, FIG. 6 is a structural view showing another embodiment of a flat
diaphragm for a speaker according to the present invention, and FIG. And FIG. 9 is an
explanatory view of the bending rigidity of the same diaphragm, FIG. 10 is a sound pressure
frequency characteristic diagram of the same diaphragm and a conventional diaphragm, and FIG.
11 is a plan view of a speaker incorporating the same diaphragm. FIG. 12 is a cross-sectional
view of the main part.
4 ······ Heart, 4 ′, 4 ′ ′ ·········· Irregular rib, 5.5 ′ ········ Surface material, 7 ·········· Small hole, 8, 1
o ... Small hole. Name of agent Attorney Nakao Toshio Other 1 person Figure 1 2? Figure 2? Fig.3
Fig.4 Fig.5 Fig.6 Fig.7 Fig.8 Fig.8 To Fig.7-To Fig.7-Fig.10 Fig.10 う @
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