JPS61196699

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DESCRIPTION JPS61196699
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat diaphragm that can be suitably used for an acoustic transducer such as a speaker or a
microphone, and the like, such as speaker characteristics, by using a core material having a
unique configuration. It is intended to aim at [Prior Art] For example, as a conventional
diaphragm in a speaker, it is a flat surface comprising a cone-shaped diaphragm made of paper
and formed into a cone shape, and a hollow thick plate having a honeycomb core sandwiched
between two surface plates (skins). It can be roughly divided into diaphragms. Among the abovementioned conventional diaphragms, honeycomb core type planar diaphragms have recently
been remarkably utilized in recent years because of their relatively low acoustic characteristics
and ease of manufacture as compared with cone type diaphragms. It is rising. [Problems to be
Solved by the Invention] Because the honeycomb core type planar diaphragm is poor in rigidity
in the lateral direction due to its structure, the front and back of the core is sandwiched by the
surface plate to maintain the rigidity in the lateral direction. There is. However, the hollow
portion of the honeycomb core having such a conventional structure inevitably has a structure
isolated from the outside. In such a structure, when a voice current is supplied to the voice coil
mounted on the back surface of the honeycomb core type planar diaphragm, the heat generation
of the voice coil is transmitted to the surface plate to expand the air in the hollow portion of each
closed core. There is a drawback that the surface plate is broken or deformed. Further, the
mechanism of sound generation of the flat plate of honeycomb core type is that the air mass of
the hollow portion formed by the honeycomb core is added to the vibrating mass, so the driving
force given to the diaphragm, ie, , Vibration power must be large. [Means for Solving the
Problems] The inventors of the present invention eliminate as much as possible the separation of
the core hollow portion of the flat plate of the honeycomb core type from the outside and make
the vibration power smaller. The present inventors have intensively studied to obtain a flat
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diaphragm different from conventional flat diaphragms, in particular, a flat diaphragm having
excellent vibration frequency characteristics in a high frequency range, and completed the
present invention, wherein the bottom is a hollow cut surface. A large number of cones are
characterized in that they consist of a plate-like substrate having a shape in which the respective
apexes are positioned on the same plane and adjacent to each other. The present invention, as
described above, comprises a plate-like substrate constituted by a collection of a large number of
hollow cones whose bottoms are cut off, and corresponds to the core of the honeycomb core type
planar diaphragm described above. As the hollow cone used as a material, various pyramids such
as a triangular pyramid, a square pyramid, a pentagon pyramid, etc. can be used, and a cone can
also be used. it can.
The arrangement in the case of the cone may be an arrangement in which the centers of the
circles on the bottom line are aligned on the same line, but may be a so-called staggered
arrangement arranged on different lines alternately. [Operation] The flat diaphragm of the
present invention is composed of a large number of small hollow cones, and the peripheral walls
of the respective small pyramids are arranged obliquely with respect to the plate surface
direction of the diaphragm. Therefore, each small pyramid itself functions as a trumpet to
generate a high natural frequency in the plane of the small pyramid and to exhibit the function of
a high-tone vibrating body, which has different characteristics from the conventional flat
diaphragm. An acoustic effect can be exhibited. There are various forms of use of the flat
diaphragm in the present invention as will be apparent from the examples described later, but
any of them may be formed on the hollow portion of the hollow pyramid or on the outer
circumference of the hollow pyramid upon vibration generation in practical use. Of the space
section of the surface plate (sheet material) resulting from the heat generation of the voice coil,
as seen in the honeycomb core type plane diaphragm, which brings about a different effect from
the conventional honeycomb core type plane diaphragm. There are no obstacles such as
deformation and breakage, and the air mass in the hollow portion is not added to the vibrating
mass, so that the vibration power can be reduced. That is, in the case of the flat diaphragms
shown in FIGS. 1 and 2, the hollow portions of the hollow pyramids in the plate-like substrates A
and B and the space portions formed in the outer circumferences of the pyramids are completely
external. Connected to the outside world. This means that there is no room for air expansion in
the core as in the case of a conventional honeycomb core type planar diaphragm in which the
inside of the core is completely closed independently. Therefore, there is no deformation damage
of the flat diaphragm caused by this. In addition, vibration power due to the addition of air mass
and vibration mass in the core is not required, and sufficient vibration generation can be handled
with small vibration power. Further, in the case of the flat diaphragm shown in FIG. 3, all the
parts-6 = minutes (I) corresponding to the hollow portions of the hollow pyramids in the platelike substrate 10 are connected to the outside in the open state, The space (.box-solid.) Formed
by the outer wall of the hollow cone forms a common wide enclosed space inside due to the
presence of the sheet material 12. Therefore, there is no fear of air expansion as in the
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conventional honeycomb core type flat diaphragm closed in the core completely independently,
nor does it require a large vibration power, and the response is sufficiently small. It is possible. In
the flat diaphragm having the configuration shown in FIG. 4, the portions (I [[) corresponding to
the hollow portions of the hollow cones of the plate-like substrate 13 form independent closed
spaces by the sheet material 16, but The outer peripheral space (TV) of the hollow cone forms a
common wide area closed space as in (II) of FIG. 3 and there is no trouble due to air expansion as
compared with the case of the honeycomb core type planar diaphragm. There is almost no
problem, and a small vibration power can be sufficiently coped with.
In the case of FIG. 5, the portions (V) and (-) corresponding to the hollow portion of the hollow
cone in the plate-like substrate 17.18 are both connected to the outside in the open state. On the
other hand, in the outer peripheral space (■) of each hollow cone, a common wide area space by
both of the plate-like substrates 17.18 is maintained inside, there is no trouble due to air
expansion for the same reason as above, and small vibration power Sufficient effects can be
achieved. Further, in the case of the configuration shown in FIG. 6, the portions (.box-solid.) And
(IX) corresponding to the hollow portions in the hollow cones of the plate-like substrate
21.degree. Since the spaces (X) and (XI) formed on the outer periphery of the cone also
separately and commonly form a wide closed space by the intermediate sheet material 25, there
is similarly no trouble due to air expansion and a large vibration It does not require power either.
The present invention will be more specifically described below with reference to the drawings.
FIG. 1 is a perspective view showing the structure of a plate-like substrate corresponding to the
core of the flat diaphragm of the present invention, wherein the flat diaphragm is a plate
obtained by combining a plurality of hollow quadrangular pyramids 1.1.1. It is composed of a
base body A. These hollow quadrangular pyramids have a shape obtained by cutting off the
respective bottom surfaces 2 ° 2.2..., And the respective tops 3.3.3. Each of the four sides
constituting the above is joined to each side of an adjacent hollow quadrangular pyramid, and
these are molded from a single sheet material. FIG. 2 is a perspective view showing another
structure of the plate-like substrate corresponding to the core of the flat diaphragm according to
the present invention as well, wherein the flat diaphragm comprises a plurality of hollow cones 4,
4.4. It is comprised by the plate-like base ¦ substrate B by coupling ¦ bonding. And these hollow
cones have a shape obtained by similarly cutting out the respective bottom surfaces 5 ° 5.5...,
And the respective tops 6.6.6. The peripheral edges of each of the hollow cones are joined to the
peripheral edges of the adjacent hollow cones, which are also molded from a single sheet
material. The plate-like substrates obtained by combining a large number of hollow cones as
shown in FIGS. 1 and 2 above are manufactured separately from the moldings of hollow cones
having no bottom, and these are combined The shape may be the shape described above, but as
described, it may be a molded product obtained by vacuum molding or press molding a single
sheet, or it may be obtained by casting. Good. The height h of the cone shown in FIG. 1 and FIG. 2
is not particularly limited, but as the height h becomes higher, a flat diaphragm with higher
rigidity is obtained. Then, by molding the plate-like substrate, it is possible to obtain a flat
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diaphragm having an arbitrary rigidity.
Although such a plate-like substrate can be used directly as a flat diaphragm in a speaker or the
like, it is desirable to use it in the mode described below in order to exhibit an improvement in
strength and a sufficient acoustic effect. That is, in the flat diaphragm shown in FIG. 3, the top
portions 1) of the plate-like substrate 10 are commonly joined by one sheet material 12. Further,
in the plane diaphragm of FIG. 4, the top portions 14 of the plate-like base 13 are commonly
joined by a single sheet material 15, and the portion forming the bottom of the hollow pyramid is
another one. The sheet members 16 are commonly joined. The planar diaphragm shown in FIG. 5
has a shape in which a pair of plate-like substrates 17 and 18 is integrally joined at the tops
19.20 of the respective hollow pyramids. The plane diaphragm of FIG. 6 is obtained by joining
and integrating the respective apexes 23.24 of the hollow cones in the pair of plate-like
substrates 21 and 22 through one intermediate sheet material 25. In the planar diaphragm of the
above-described embodiment, the hollow portion of the hollow cone and the space portion at the
outer periphery of the hollow cone are significantly different from those of the conventional
honeycomb core type planar diaphragm by using the hollow cone. Thus, troubles such as
breakage due to air expansion inside the flat diaphragm are completely eliminated. In addition,
since the air mass in the hollow portion is not added, the vibration power can also be reduced. In
each of the a-like shapes, as shown in FIG. 7, the tops of the hollow pyramids of the plate-like
hollow body 26 are flattened in parallel with the bottom without being sharpened. As a result,
the bonding with the sheet material or the bonding between the respective tops becomes reliable,
and the strength as a flat diaphragm can be remarkably improved. The plate-like substrate in the
flat diaphragm of the present invention is paper. Materials such as plastic films and metal plates
can be used. Among them, papermaking is preferred as the paper-like material, polypropylene
and polyethylene as the plastic materials, and aluminum thin plates as the metal. As described
above, these can be extremely easily manufactured by a molding method such as vacuum
molding, press molding, casting and the like. [Advantage of the Invention] Since the plate-like
substrate in the planar diaphragm of the present invention is composed of a large number of
hollow cones, it has particularly excellent strength in the lateral direction of the plate surface,
and the planar diaphragm obtained therefrom Is excellent in strength substantially equal to or
superior to that of the conventional honeycomb core type planar diaphragm. In addition, the
plate-like substrate formed by the assembly of a large number of small cones has its cones
arranged obliquely with respect to the plate surface of the plane diaphragm to serve as a
trumpet, and has a high natural frequency. Can be generated.
In addition, each hollow portion formed by a large number of such small pyramids and the space
portion at the outer periphery of the pyramid exclude complete separation from the external
environment of the diaphragm, thereby preventing deformation of the diaphragm due to
expansion of internal air. A trouble can be prevented, and a flat vibration plate with high
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frequency characteristics different from that of the conventional flat vibration plate can be made
with small vibration power. Incidentally, the plate-like substrate which is the basis of the flat
diaphragm in the present invention can be easily manufactured by mere molding of a sheet-like
material, which may be used as it is, or other sheet material may be bonded thereto. Therefore,
the present invention is extremely easy to manufacture because an excellent flat diaphragm can
be obtained, and the present invention is useful in many ways.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing a plate-like substrate in the flat diaphragm of the present
invention, and FIG. 2 is a perspective view showing another embodiment of the plate-like
substrate, and FIG. 3 is one of the flat diaphragms of the present invention. 4 is also a
longitudinal sectional view showing another aspect, FIG. 5 is also a longitudinal sectional view
showing other aspect, and FIG. 6 is a longitudinal sectional view showing other aspect, FIG. 7 is a
longitudinal sectional view showing another embodiment of the plate-like substrate in the plane
diaphragm.
Reference numeral 1 in the drawing: hollow square pyramid, 2.5: bottom surface 3.6.1). 14.19,
20, 23. 24 ... top, 4 ... hollow cone, 12, 15. 16 ... sheet material, 25 ... intermediate sheet material,
27 ... flat surface patent application People NMB Audio Research Ltd.
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