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JPS58174000

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DESCRIPTION JPS58174000
[0001]
The present invention relates to a lightweight and rigid speaker diaphragm. The diaphragm for
the speaker is required to be light and have a high ratio of Young's modulus to density
(hereinafter referred to as E / ρ) and a large thickness. ここで。 The weight is mainly related to
the efficiency of the speaker, and E / ρ is related to the expansion of the reproduction band of
the speaker. In addition, the thickness has an effect of suppressing high-order divided vibration
and non-axisymmetric vibration of the diaphragm while improving the bending rigidity of the
diaphragm. As a diaphragm that is thick and light and has a large E / ρ, expansion to a
multilayer structure is considered. Conventionally, an aluminum honeycomb having a hexagonal
cell shape is used as a core material, and a surface material is attached to the front and back
surfaces of this core material. The honeycomb diaphragm of sandwich structure was used. FIG. 1
is a plan view of a partially cut-out honeycomb diaphragm, and FIG. 2 is a sectional view of the
honeycomb diaphragm. In the figure, (1) is a surface material, (2) is a back surface material, (3) is
a honeycomb core which is a core material, and (4) is an adhesive material. In this honeycomb
diaphragm, since the honeycomb core (3) as the core material is uniformly formed in a hexagonal
shape as shown in FIG. 3, the nine surface material (1) is uniformly divided in a hexagonal shape.
Therefore, as shown in FIG. 4, a phenomenon occurs in which the surface material (1)
concentrates and vibrates at a specific frequency in the cell portion of each honeycomb core (3).
Since the vibration of the cell portion is superimposed on the vibration of the entire diaphragm,
there is a disturbance in the high range of the sound pressure characteristic emitted from the
diaphragm and a omission that similarly causes a level reduction in the high range. SUMMARY
OF THE INVENTION The present invention provides a speaker diaphragm that eliminates the
deficiencies of the conventional one as described above and improves the deterioration of sound
pressure characteristics. That is, the present invention has a large number of integrally formed
hollow projections, and the bottom area of the projections and the area of the non-projections are
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made different, and the projection-side end surface of the thin plate in which the bottoms of the
projections are punching holes. The surface material which consists of thin plates is stuck on.
The present invention basically comprises two sheets, and since most of the space between the
bottom of the thin plate having the projections and the surface material is air, the weight can be
reduced. Since the protuberances are integrated with the thin plate, they are structurally strong
and become a multilayer structure in which the surface material is attached to the end faces of
the protuberances. The value of / ρ can also be equivalent to that of the conventional
honeycomb diaphragm. Furthermore, since the surface material is divided unevenly and unevenly
as in the conventional ニ ニ カ ム 振動 cam due to the projection, if attention is paid to the
vibration form of the surface material.
There is no occurrence of cell vibration due to concentration at a specific frequency, and there is
little deterioration in sound pressure characteristics. The details of the present invention will be
further described according to the nine illustrated embodiments below. FIG. 5 is a longitudinal
sectional view of a speaker diaphragm showing one embodiment of the present invention. In FIG.
0, (5) is, for example, a metal such as aluminum or titanium, a plastic sheet, or a hollow
cylindrical shape A thin plate having a projection (6) (a sheet-like surface material made of a
sheet of a mixture of metals such as aluminum and titanium, plastic, or plastic similarly, the tip
surface of the cylindrical projection (6) of the thin plate (5) Into the polyamide system. Or EOA
based adhesive (4) is attached. FIG. 6 is a plan view of a thin plate (5) having the hollow
cylindrical projection 16), and FIG. 7 is a partially enlarged perspective view thereof. The method
of manufacturing the speaker diaphragm having the above-described configuration is as follows.
After forming a thin plate (5) having air-like projections by vacuum forming, extrusion forming,
press forming or the like of a metal or plastic sheet Cut off the end of the spinous process. It can
manufacture by sticking the sheet-like surface material fil of metal, a plastics, or a paper with the
polyamide-type or EvA-type adhesive material (4) after setting it as a cylindrical protrusion (6).
Therefore, the conventional honeycomb diaphragm is very difficult to apply to a speaker in the
popular price range because the manufacturing method of the honeycomb core (3) which is the
core plate is double fiber and expensive, so the manufacturing cost is high, but The above
embodiment can be easily manufactured as compared with the honeycomb diaphragm, and is low
in cost and excellent in mass productivity, so that it can be easily applied not only to high-class
speakers but also to speakers in a popular price range. Further, in the above embodiment, the
ridged protuberances (6) are formed by vacuum forming, extrusion forming, press forming or the
like of the sheet-like thin plate (5), and the surface material (11 is adhered to the protrusions (6)
Since the thickness of the diaphragm can be adjusted without changing the weight of the
diaphragm by changing the height of the projection (6) at the time of molding, the thickness can
be matched to the speaker used. FIG. 8 shows the sound pressure characteristics of the speaker
using the diaphragm shown in FIG. 5 (al and the sound pressure characteristics (b) of the speaker
using the conventional honeycomb diaphragm. As apparent from this figure, the sound pressure
characteristic in the high range is greatly improved. FIG. 9 shows another embodiment of the
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present invention, in which the tip of the projection (6) is closed. By doing so, it is not necessary
to omit the step of cutting the closed portion of the tip if the formation of the thin plate is formed
in the same manner as in the above embodiment. The adhesion between 6) and the surface
material (1) is improved.
Furthermore, focusing on the surface material fil, since the thickness is partially different, the
vibration at the cell portion is further suppressed. In each of the above embodiments, the planar
shape of the projection (6) is a circle, but it is not limited to a circle, but may be a hexagon as
shown in FIG. 10, a quadrangle as shown in FIG. The same effect can be obtained as a polygonal
structure such as. Further, the shape of the diaphragm can correspond to any of a cone shape, a
dome shape, a flat plate and the like. As described above, according to the present invention, a
thin plate having a large number of integrally formed hollow projections and having different
bottom areas of the projections and areas of non-projections. Since the surface material of the
thin plate is adhered to the tip end surface of the thin plate on the projection side, the surface
material is divided unevenly by the protrusion, so that the cell portion as in the conventional
honeycomb diaphragm The sound pressure characteristic is improved without the occurrence of
vibration concentrated on the frequency of.
[0002]
Brief description of the drawings
[0003]
1 is a plan view of a conventional honeycomb diaphragm cut away, FIG. 2 is an n-n enlarged
sectional view of FIG. 1, FIG. 3 is an enlarged plan view of a hexagonal honeycomb core, FIG. Fig.
4 is a view showing the surface member vibrating in the cell portion, Fig. 5 is a longitudinal
sectional view of the diaphragm showing one embodiment of the present invention, Fig. 6 is a
plan view of the thin plate (5), Fig. 7 Is a partially enlarged perspective view of the thin plate (5).
FIG. 8 is a sound pressure characteristic view, FIG. 9 is a longitudinal sectional view of a
diaphragm showing another embodiment of the present invention, and FIGS. 10 and 11 are thin
plates showing still another embodiment of the present invention. It is a top view. The code (1) is
a surface material, (2) is a back surface material, (3) is a honeycomb core to be a core material,
(4) is an adhesive material, (5) is a thin plate having a protrusion, and (6) is a protrusion. In the
drawings, the same reference numerals denote the same or corresponding parts. . Agent Shino
Nono-Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 6 γ Fig. 8 n wave field 2] Fig. 9! Fig. 10 Fig. 11-
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620 =
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