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Description 1, title of the invention
Acoustic diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to an iki-like prayer
diaphragm and its method of manufacture, which is suitable for use in a loudspeaker:
microphone ? sound device. Conventionally, when manufacturing an acoustic diaphragm having
a honeycomb honeycomb structure, generally, as shown in FIG. 1, both the core 2 'having
hexagonal holes and the surface material 1' are made of aluminum or the core 2 'is made of
aluminum In many cases, the surface material 1 'is formed by using a material obtained by
solidifying carbon fiber with plastic. Moreover, it is technically difficult to manufacture the core 2
'and has a drawback that the manufacturing cost is high, and moreover, when the surface
material 1' is attached from both sides, the method of applying the adhesive tends to cause spots.
It is difficult to maintain the mass of the diaphragm within a constant range. Father, the surface
material 1 'is applied to both sides of the core 2', which takes a long time to assemble, and there
is also a defect that adhesion failure etc. is likely to occur. 0 When aluminum is used as the
material as described above, Since the internal loss is also small, divisional vibration is generated
from a relatively low frequency, and sharp peak tips are formed in the frequency characteristics,
and the transient characteristics and distortion characteristics are deteriorated to often
deteriorate the sound quality. On the other hand, even when carbon fiber is used for the surface
material 1 ', the carbon # fiber itself has a large specific elastic modulus, and its properties are
deteriorated due to being compounded with plastic, and the above-mentioned aluminum is used.
The characteristics were improved to some extent as compared with the case. In addition, when
forming a honeycomb monument on the peristaltic plate, since the cross section of the
honeycomb appears at the end of the diaphragm, not only the appearance is not constant & the
deformation that causes the occurrence of chatter etc. When pasting an edge to the diaphragm, it
is preferable to paste it on the center line in the thickness direction of the diaphragm, from the
point of balance of IFjV, but it is preferable that the conventional diaphragm is used. In this case,
it was necessary to put an edge on the upper or lower surface of the core 2 'having hexagonal
holes. The object of the present invention is to solve the above-mentioned drawbacks, and it is
particularly suitable for flat type diaphragms such as speakers and microphones, and is made of
a material obtained by kneading graphite powder and material G having caking property. The
specific elastic modulus and internal loss are increased by joining the ridges of the two face
plates provided with ridges on the inner surface, making them easy to lend and easy to
manufacture in commercial use. The present invention provides an acoustic diaphragm whose
cost is low and a method of manufacturing the same. Hereinafter, the first invention of the
present application will be described according to an embodiment shown in FIGS. 2 and 3. FIG.
EndPage: 21 is a vibration plate I, 2 is a surface facing plate divided into half to constitute the
diaphragm 1, and this surface plate 2 is a projection having a concaved outer surface and a
projected inner surface. Provide the part 2a, around the end face?
This is formed into a box-like overall shape by providing the side wall 2b. The flat 1 ni shape of
the projecting portion 2 a is not limited to the circle e, and may be a hexagon, a hexagon, or the
like, and the number and the arrangement If of the part may be harmful. It devises and is
provided to eliminate the mode of. Reference numeral 2c denotes an edge portion connected to
the side wall 2b of the front facing plate 2. The u-portion 2b is for ensuring a sufficient bonding
amount when assembling the diaphragm 1 to ensure bonding. Further, by sticking the edge 3 to
the edge 2c of the face plate 2, it is possible to support a well-balanced portion of the mass of the
vibration assisting plate 1 to perform accurate vibration. The diaphragm 1 is formed by joining
the respective protruding portions 2.11 of the two front face plates 2 and joining the moats of
the two front face plates 2.2 with the portions 2c and 2c, Moreover, the small air chamber 4 is
formed between the surface plates 2.2 by joining the respective projecting portions 2a% 2a of
the two surface plates 2.2 as described above. By making the overall shape of the surface plate 2
into a box shape as described above, the rigidity can be increased when the diaphragm 1 is
assembled, and the appearance is also improved. So 4 '? The deformation of the p + part and the
adhesive failure disappear. The bonding means of the face plate 2.2 is carried out by bonding
using an adhesive or by appropriate means such as thermocompression bonding. The surface
plate 2 is manufactured by a mixed method of graphite powder and a substance having a caking
property and is manufactured by a processing method such as co-forming or pressure forming,
but hereinafter the second invention of the present application will be described as an example.
20 parts of graphite powder having an average particle diameter of 5 ?m and 10 parts of
polyvinyl chloride (both in weight ratio) are kneaded uniformly with a kneader or a roller using a
material-rich vinyl having caking properties. The Young's modulus of the graphite powder and
the vinyl chloride in this case is about 9/1000 to 1000. Next, in the second step, the mixed
material of the graphite powder and the vinyl chloride produced in the elevating step is rolled by
a roller or press rW into a sheet. In this case, the reason for applying the rolling treatment is to
orient the graphite powder, so that the Young's modulus Y is 6000? A surface plate is obtained
which has a value of / mJ ', a density ? of about 1.8 f / ctn, a specific elastic modulus of
3.3О10@3 and an internal loss (tan ?) of 0.05. Young's modulus of aluminum is 7000 kg / yl, m
',' Cf W 2.7? Since ?Z 2.6 U?j? is shown for each of the specific elastic modulus 2.6 О 10 ?
cylinder of / cd and specific modulus, the specific modulus of the above material is about 1.3
times better than that of aluminum. The piston can be interlocked up to a high frequency band.
Father, the internal loss is a numerical value of aluminum (theoretical ? =) 0.003, so it is
possible to obtain a flat frequency characteristic with more than one digit of dog. Further, as the
third step, the mixed wire material of the graphite powder and the vinyl chloride sheeted in the
previous step is co-learned or pressure-formed, and several ridges 2a are provided on the inner
surface. The surface plate 2 of the whole shape box shape which provided the side wall 2b is
shape | molded. In the case of Kono, the facing plate 2 can be formed by the press molding
method using two male and female molds, but this method makes the cost of making the mold
very high and is not economical. Therefore, it is advantageous to manufacture the face plate 2 by
the three-in-one method, because the cost of manufacturing the mold is lower and it is
advantageous in FIG. 4. In FIG. And B, a sealing member mounted on the upper surface of the
mold A and having a gas inlet for introducing high pressure gas C thereinto. Fourth, the surface
plate 2 may be carbonized or graphitized in order to significantly improve the Young's modulus
of the surface plate 2, but in this case, the lead powder or the caking material is rolled into a
sheet as described above. Then, it is formed into the shape of the surface plate 2 and is
graphitized or carbonized and assembled into the diaphragm 1 or formed into the surface plate 2
using the sheet and then assembled into the diaphragm 1 by thermocompression bonding It may
be carbonized or graphitized. In order to perform carbonization, the temperature of the surface
plate 2 or the diaphragm 1 assembled by thermocompression bonding is first raised in an
oxidizing atmosphere at a temperature of 300 ░ C. (10 ░ C. and 1 ░ C./hour to 10 ░ C./hour)
Pre-baking and infusibilization treatment by heating at a speed. Next, carbonization is performed
by heating to 1200 ░ C. at a temperature rising rate of 5 ░ C./hour to 50 ░ C./hour in a nonoxidative atmosphere. The Young's modulus of the sheet-like material obtained by mixing 20
parts of vinyl chloride with 20 parts of the graphite powder that has been carbonized in this way
and rolling it reaches 23000 Kq / lun '. In addition, the graphitization treatment is performed by
heating to 2500 ░ C. or more. In this case, the heating rate may be the maximum rate
determined by the repulsive force of the furnace. The Young's modulus of the graphitized surface
plate 2 or the diaphragm 1 after assembly is as high as 30,000 kg / lug '. Moreover, the density
of the carbonized or graphitized face plate 2 or diaphragm 1 as described above is about 1.7 f /
am, and the specific elastic modulus is larger than that of beryllium. In the above description, an
example of using polyvinyl chloride as the caking material is described, but as other caking
materials, vinylidene chloride, a combination of vinylidene chloride and acrylinide is used. It has
been experimentally confirmed that the same effect can be obtained with a polymer, a copolymer
of vinyl chloride and vinyl acetate.
Especially when using 85 weight percent of vinyl chloride and 15 weight percent of vinyl acetate
in addition to the vinyl chloride in the above example, the Young's modulus is improved by about
20 inches as shown in FIG. Among these, the one shown in FIG. 5 is provided with a groove 2d on
the outer surface of the surface plate 2 in order to ensure adhesion of the voice coil bobbin, and
this groove is shown in FIG. Voice Filpobin 5 is mated and bonded within 2d. In the case of the
father, one shown in FIG. 6 is provided with an outer surface opening protrusion 2c for bonding
the voice coil bobbin 5, and the voice coil bobbin 5 is engaged and bonded to the protrusion 2c.
However, in order to fix and support the voice-fill bobbin 5 to the surface plate 2, not only the
grooves 2d or the protrusions 2C as shown in FIG. 5 and FIG. It may be formed on the outer
surface. 6 is a lip interposed between the face plate 2.2, and this lip 6 is provided to faithfully
transmit the vibration of the voice film 5 to the face plate 2.2, and it is assumed that the high
frequency reproduction is good. Become. Although the above description has described an
example in which the main diaphragm and the flat diaphragm e are applied, it is also possible to
manufacture other cone-shaped or dome-shaped ones by EndPage: 4 forming the molding die
into an appropriate shape. Needless to say. As described above, according to the first invention of
the present application, the entire surface is formed of a material obtained by kneading a
graphite powder and a substance having a caking property, and one of the surface plates is
provided with a single fracture portion and joined to each other. As a result, since the structure is
formed to have a large number of small air chambers between the face plates, the specific
modulus and internal loss are large, and a highly rigid front diaphragm with a weight reduction is
favored. Therefore, the acoustic characteristics are improved and sufficient reproduction can be
performed. Father, according to the present invention $ 2 invention, since the bonding work can
be reduced, the working efficiency can be greatly improved and the application spots of the
adhesive can be reduced as much as possible. And when it uses especially for a speaker, the
reproduction | regeneration zone | band can be expanded and the acoustic diaphragm in which
sound quality characteristics, such as 1 ? and a transient characteristic, were greatly improved
can be obtained.
4. Brief description of the drawings. FIG. 1 is an exploded sectional view showing an example of a
conventional acoustic diaphragm having a honeycomb structure, FIG. 2 is a plan view showing an
embodiment of the first invention of the present application, and FIG. Figure IT! 4 is a crosssectional view showing an example of an apparatus to be used, and FIG. 5 is a cross-sectional
view showing an example of the apparatus used, and FIG. It is sectional drawing which shows
each real 4 j example. 1
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