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JPS58106995

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DESCRIPTION JPS58106995
[0001]
The present invention relates to a diaphragm for a rectangular flat panel speaker, and the object
of the present invention is to increase the strength in the longitudinal direction and the lateral
direction of the diaphragm, reduce the weight, and improve the productivity thereof. It is. In the
conventional speaker diaphragm, a cone-shaped diaphragm made of paper pulp is generally used
widely, but the cone-shaped diaphragm is flat because the positions of the inner and outer
peripheral portions with respect to the sound source are offset. There is a drawback that the
sound pressure frequency% can not be obtained. Then, the flat plate speaker which made the
diaphragm flat and aligned the position of the sound source is developed as a flat speaker of a
sound pressure frequency characteristic, and installation, such as a television and a radio, is
effectively used for the apparatus with a limited area. Since this flat diaphragm has only a small
rigidity with respect to bending only with the diaphragm, split vibration is likely to occur, making
it difficult to flatten flat characteristics over a wide band. Therefore, in order to solve this
problem, as shown in FIG. 1, a flat diaphragm generally having a surface plate 2 made of
aluminum foil or the like attached to both sides of a 6 plate 1 made of plastic foam such as
expanded polystyrene. Although used, the flat diaphragm of FIG. 1 has the advantage that it is
easy to manufacture and can be provided at low cost, but has the disadvantage of heavy weight,<, and low efficiency. As another means for enhancing the rigidity of the flat diaphragm, there is
a conventional example in which the surface plate 2 is attached to both surfaces of the core 3
made of a strip loop of aluminum foil as shown in FIG. The core material 3 made of the aluminum
foil strip loop is light in weight and efficient, but it is expensive to manufacture, and the bending
strength in the width direction is extremely small compared to the bending strength in the
longitudinal direction. . In addition, although it is conceivable to make the shape of the core
material 3 into another shape other than a loop, the formed aluminum foil generally has a
drawback that its production and assembly are complicated and its productivity is lowered. The
11-05-2019
1
present invention is intended to provide a diaphragm for a rectangular flat loudspeaker without
the above-mentioned drawbacks. The diaphragm of the present invention is characterized by
using a stone plate formed of a thermoplastic synthetic resin film in a honeycomb or lattice
shape. As a means for forming in a honeycomb shape or a lattice shape, a means such as vacuum
forming, pressure forming or press forming is employed. In FIG. 3 and FIG. 4, a stone plate
molded into a 4Fi honeycomb shape is shown as To 夛, and FIG. 5 shows a stone plate 5 molded
into a lattice shape. In FIG. 3, reference numeral 2 denotes a surface plate made of a light metal
foil or a woven plastic film having a relatively high elasticity. A stone plate made of this
honeycomb or lattice plastic film 4.5.
Is lighter than a stone plate 1 made of plastic foam in FIG. In addition, the core material 3 of the
aluminum foil molding shown in FIG. 2 has the advantage that it is much easier to manufacture
and can be provided at low cost. FIG. 6 is a graph comparing the sound pressure frequency
characteristics of a nine rectangular flat plate speaker using the diaphragm of the present
invention with the speaker using the conventional diaphragm of FIG. 1 and FIG. add: speaker
using the diaphragm of the present invention, h: speaker using the diaphragm of FIG. 1, C:
speaker ρ sound pressure frequency characteristics using the diaphragm of FIG. 2 As is clear
from the graph, it can be seen that the speaker a using the diaphragm of the present invention
has higher sound pressure and better efficiency than the case of b and C using the conventional
diaphragm. As described above, according to the present invention, by using a honeycombshaped or lattice-shaped stone plate made of a thermoplastic synthetic resin, it is possible to
impart a suitable bending strength to a rectangular flat plate diaphragm, and this type of
conventional type It is possible to obtain a rectangular flat-plate speaker that is lightweight,
inexpensive, and excellent in sound pressure frequency characteristics as compared to a
diaphragm. Therefore, the present invention has the effect of achieving the intended purpose of
the present invention described at the beginning.
[0002]
Brief description of the drawings
[0003]
1: a conventional diaphragm, (a) plan view, ←) is a side view, FIG. 2: another diaphragm of the
prior art, 0) is a plan, 側面) is a side view Fig. 3m: 1 showing an embodiment of the diaphragm
according to the invention, 0) is a plan view, ←) (iii) is a diagram showing an embodiment of a
honeycomb-shaped stone plate of the present invention Is a plan view, ←) is a side view of the
51st embodiment of the lattice-like stone plate according to the present invention, (eO is a plan
view, ←) # -i side side view, sixth wood and two are diaphragms A graph comparing the sound
pressure frequency characteristics of the speaker using the speaker and the speaker using the
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2
conventional diaphragm in FIG. 1 and FIG. 2 [symbol] 1 ... stone board made of plastic foam, 2 ... *
3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · honeycomb honeycomb of the present
invention, 5 · · · · · 1 City 5 Fig.
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