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Description 1, title of the invention
Acoustic diaphragm and method of manufacturing the same
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic
diaphragm suitable for use in an acoustic device such as a speaker or microphone, and to a
method for producing the same. By providing the structure having a small air chamber, it is
possible to provide a blue tatami diaphragm that is extremely easy to be manufactured and
intended to significantly improve the sound characteristics, and at the same time it is easy to
manufacture and has excellent characteristics. It provides a method that can be manufactured.
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. FIG. 1 is a perspective view of a 7% two cam structure acoustic diaphragm showing
an example of the present invention. In the figure, 1 indicates a core portion J2 indicates a skin
portion. The core part 1 mixes a graphite powder and a vinyl chloride (hereinafter referred to as
PvC) and manufactures a round material by a processing method such as an injector. For
example, 20 parts of graphite powder and 310 parts of P powder are kneaded, and desired
molding is carried out by \ / unicam-like molding by means of molding as disclosed in JP-A-5574294 (2) combinatorial silane. In this case, according to the compression molding method, the
graphite powder in the material is well oriented to obtain the core portion 1 with high rigidity.
After the core portion 1 is formed into a no nick shape, it is heated to 250 ░ C. in an oxidizing
atmosphere to perform pre-baking. Then, it is carbonized by heating to 1200 ░ C. in a nonoxidizing atmosphere. The core part 1 subjected to the above processing has Young's modulus s,
ooo to 8000 KP / 1 m ", density is about 1.717 Ql", and the ratio of Young's modulus to density
(specific elastic modulus) is compared with that of aluminum. Approximately 1.5 times. The skin
2 is the same as the core 1 KJ! (11) A material obtained by mixing lead powder and resin is rolled
with a roll to form a flat plate. There are also methods such as extrusion molding method other
than the positive electrode method for manufacturing flat plate, but even if material obtained by
kneading hot lead powder and resin is manufactured by extrusion molding method, the Young's
modulus of the flat plate is tb Not high. In this method, the graphite powder mixed in the resin is
not oriented. On the other hand, rolling by a roll causes the graphite powder in the flat plate to
be oriented and the Young's modulus increases, so it is better to roll the flat plate used for the
skin portion 2 by a roll. 20 parts and 27010 parts of graphite powder are thoroughly kneaded
with resin apvc and rolled with a roll, Young's modulus 6000 Kp / m ', density 1.8 g / an ",
specific modulus 3.3 XIQ'm, internal loss (taflJ ) A flat plate is obtained which exhibits a 0.05O
value. Young's modulus of aluminum is yoo.
Since the respective values are shown, the specific elastic modulus of the above material is about
1.3 times as high as that of aluminum, as compared with the specific elastic modulus of
aluminum. As a result, it is understood that the speed of sound propagating through the flat plate
becomes faster and the piston movement is possible up to a high frequency band. The internal
loss is as large as one digit or more because the numerical value of aluminum is (?? =) 0.0O 3,
and flat frequency characteristics can be obtained. Furthermore, in order to significantly improve
the Young's modulus of the skin portion 2, the skin portion 2 is carbonized in an inert gas at 500
to 1000 ░ C. after being subjected to infusibilization treatment by pre-baking. The carbonized
skin portion 2 has a Young's modulus of 16000 for 2 and a density of 1.7 I / S1 and a specific
elastic modulus of 9.4 X [Q 'Rong, internal loss (m ? =) 0.0 s. Although the internal loss is
slightly reduced, the specific elastic modulus will be greatly improved. The skins 82 are bonded
to the both surfaces of the core portion 10 manufactured as described above with an adhesive
and assembled to form a honeycomb EndPage: 2 acoustic diaphragm. In the above description,
although an example using PvC as a resin is described, as other resins, vinylidene chloride, a
copolymer of vinylidene chloride and acrylonitrile, and a copolymer of pvc and acrylonitrile are
similar. Experiments have shown that an effect can be obtained. Moreover, the book which
combined 2 or more types of these resin can be used. FIG. 2 shows, as another example of the
present invention, a core portion in which a lip is formed in a pattern of a combination of
concentric circles and radiation. In the figure, 3 indicates a small air chamber and 4 indicates a
lip. In this pattern, concentric nine grooves are produced by a lathe, and then radial grooves are
produced by forming a radial groove by using a milling machine or the like. JP-A-55-74294 (3) is
effective. The notches of the core portion in the present invention are not limited to those
described above, and may be in the form of triangles, squares or other patterns. Next, an
embodiment of the second aspect of the present invention will be described with reference to
FIG. FIGS. 3 (a) to 3 (d) are diagrams showing the steps of manufacturing a diaphragm with an I и
two cam structure. In FIG. 3a, 5 is a flat plate made by rolling the material obtained by kneading
the graphite powder and the resin, and 6 is a lead-free powder. The graphite powder 6 is
oriented along the surface of the flat plate by rolling as shown in the figure. As described above,
since the graphite powder is not oriented by merely kneading 1 M fat and therefore the specific
elastic modulus is not improved, the orientation is improved by rolling with a roll as in the
example of FIG.
Each flat plate 5 is set in advance to a thickness such that it can form a skin portion of a
predetermined thickness and a hexagonal recess of a predetermined depth when it is formed in
the next step. Next, as shown in FIG. 3, the flat plate 5 is pressed with an upper mold formed in a
hexagonal honeycomb shape and a flat lower plate, and compression molding is performed to
manufacture one side of a honeycomb structure. FIG. 3C is a longitudinal sectional view along cam in FIG. In the figure, 1 indicates a hexagonal recess, and 8 indicates a lip surrounding the
recess. A part of the upper surface of the flat plate 5 is moved to form the lip 8 by forming the
constriction 11, but since the graphite powder of the remaining part is kept in the oriented state,
the surface of the honeycomb and The Young's modulus of the portion where it is formed is not
reduced, and excellent characteristics will be obtained. Next, as shown in FIG. 3d, one side of the
honeycomb-shaped diaphragm as shown in FIG. 3o is butted up and down, and the flat portion of
the lip 8 is bonded by bonding a large number of ribs. It is possible to form an acoustic
diaphragm of no-two cam structure having a small air chamber. In this case, the Young's modulus
is obtained by heating one side of the diaphragm as shown in FIG. 3 o to 250 ░ C. in air for
preliminary baking and then heating to 1200 ░ C. in a non-oxidizing atmosphere. It can be
greatly improved as in the above example. Therefore, according to the structure in which the skin
portion and the core portion are separately manufactured and bonded, two bonding operations
are required to bond the skin portion from both sides of the core portion, which is not efficient.
In the example of FIG. 3 of the method, the number of adhesions is one and the number of
moldings is only one, so that the manufacturing time can be shortened and the number of
operation steps can be significantly reduced. Also, the acoustic diaphragm may need to be
lightened in order to raise the sound's V% characteristics EndPage: 3 '. Therefore, the weight of
the adhesive itself is always a problem, but when the adhesive layer is made into two layers, the
amount of adhesive increases, and the unevenness of application of the adhesive leads to the
dispersion of the amount of adhesion. However, in this example, variations due to adhesion and
adhesion occur almost at all. Although the above description has mainly described an example
applied to a flat diaphragm, by making a forming die used for forming a complex four into an
appropriately shaped one 3, other cone-shaped or dome-shaped ones are also manufactured. Of
course what can be done. Also, the pattern of the lip is not limited to the honeycomb shape, and
when the pattern faces are made to be 1110 ? ? symmetrical with the pattern shown in FIG.
Japanese Patent Application Laid-Open No. 555-74294 (Any pattern is acceptable as long as the
person meets.
As described above, according to the specific invention of the present application, the material
obtained by kneading the graphite powder and the resin is formed to have a structure having a
large number of small air chambers partitioned by the lip inside the case, so the formability of
the material is extremely good. Therefore, it has the effect of being easy to manufacture and
reducing the number of operation steps, as well as having high rigidity due to the large number
of internal ribs, and high density due to the small air chamber. Due to the increase of ? and the
decrease of ? due to the presence of the graphite powder, the VP has high characteristics due to
K. That is, conventionally, as the material constituting the diaphragm, a material in which
aluminum or carbon fiber is solidified with a resin is used in the skin portion, and a large amount
of aluminum is used in the core portion. If the book is made of a diaphragm made of carbon fiber
and resin, it has a low ratio of Young's modulus to specific gravity (specific elastic modulus), so a
diaphragm with good sound I # characteristics is obtained. It is difficult. Forming the core with ti
aluminum is extremely difficult in practice, requires special processing techniques, and can not
finally provide a low-abrasive diaphragm. However, according to the specific invention of the
present application, as described above, it is possible to provide the low friction with the
diaphragm which can solve all these drawbacks. Furthermore, according to the second aspect of
the present invention, since the bonding operation can be performed once, the working efficiency
can be greatly improved, and the uneven distribution of the adhesive can be reduced as much as
possible. It is possible to obtain a front diaphragm whose band is expanded and acoustic
characteristics such as distortion and transient characteristics are greatly improved.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a diaphragm
having a honeycomb structure showing an example of the invention of the present invention, FIG.
2 is a plan view showing a core butter in another example of the invention of the present
invention, FIG. 3 is a process chart showing an example of the second invention of the present
application. 1 иииии Core part 2 иии и и и Skin part 3 иии и и и Small air chamber 4 и и и и Lip 5 и и и и и и и и и и и и и
и и и и Turning part 8 ииииииии Rib EndPage: ?
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