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■ Manufacturing method of diaphragm for loudspeakers App. Akira Akira 49-6163 特 願
Japanese Patent Application No. 45-34171 [Phase] Application Akira 45 (1970) April 20 @
inventor Inagaki Michihiro Odate Shin Ogata Kadoshin 1006 Matsu F Electric Industrial Doutake
Masahiko Co., Ltd. @ Applicant Matsu F Electronics Industrial Co., Ltd. Kadoma City Bold
Kadoshin 1006 [Available] Attorney Nakao Toshio Nakao 1 person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a
conventional method for manufacturing a speaker diaphragm, FIGS. 2A and 2B are explanatory
views showing another conventional method, and FIG. FIG. 4 is a perspective view of one step
showing another method, and FIG. 4 is an outline of one step showing one embodiment of a
method for manufacturing a speaker diaphragm of the present invention. Explanatory drawing,
FIG. 5 is a perspective view of an essential part of a round mesh papermaking apparatus used in
the manufacturing method, FIG. 6 is a sectional view of a diaphragm sheet obtained by the
apparatus, and FIG. 7 is a perspective view showing a processing method of the sheet. FIG. 8 is a
perspective view of a speaker diaphragm formed by the same method.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
manufacturing a loudspeaker diaphragm having excellent acoustic characteristics.
Conventionally, various methods have been developed and used as a method for manufacturing a
speaker diaphragm. As one of them, as shown in FIG. 1, the stock of the pulp liquid is made to
flow into the net 1 set in the paper making machine 2 by using the net 1 in the shape of a cone
or in the column cone. There is a method of passing only water and depositing it on the paper net
1, and in the peripheral part, the deposition amount of the peripheral part is slightly reduced by
reducing the drainage speed from the central part, and the compliance at the time of completion
of one coin paper I'll give it [111111]. However, with this method, imbalances in the amount of
deposition inevitably occur and it is impossible to obtain a sufficient amount of sound custommade. Further, in the method shown in FIG. 2, the flat diaphragm sheet 3 is cut into a fan shape
as shown in A, and this is pasted into a cone shape as shown in B, and its peripheral portion is
made as necessary. It is a thin sandpaper-like material and then shaped by containing water.
According to such a method, it takes time and effort to produce the same, the productivity is
poor, and the cost is extremely disadvantageous. Also, the method shown in FIG. 3 is the flat plate
shown in FIG. Instead of the diaphragm sheet in the shape of a circle, the flow velocity is changed
at a portion corresponding to the peripheral portion of the diaphragm 1 to use the diaphragm
sheet 4 which is made thin, but also in this method, The amount of the deposited material is
inevitably unbalanced, and the acoustic characteristics deteriorate at any time. The present
invention eliminates the above-mentioned conventional drawbacks. The method of
manufacturing the speaker diaphragm of the present invention will be described with reference
to the drawings of one embodiment. That is, also in the present invention, a diaphragm sheet
thinly formed at its peripheral portion as shown in FIG. 3 is manufactured, which is cut into a fan
shape and pasted into a diaphragm for a speaker. As a method of forming a thin portion
corresponding to the peripheral portion, a round net drawing machine as shown in FIGS. 4 and 5
is used. That is, a cylinder 7 ° 8 provided with two tanks 5 and 6 and whose circumferential
surface rotating at various 5 ° 6 is made of paper net is attached, and this cylinder 7.8 is rotated
at a low speed, and this cylinder 7.8 Water is discharged to the outside from the central axis 9 of
the And, in the above-mentioned tank 5, a large fiber length and [111111] EndPage: 1 fiber itself
that is rich in tensile strength, bending strength and flexibility, for example, fiber such as cord,
three ridges, etc. is mixed with water The pulp liquid 10 is poured, and a pulp liquid 11 using
fibers with a high degree of beating is used for the tank 6.
The cylinder 7 is made of a mesh of constant mesh, and the cylinder 8 is a double mesh, and the
mesh of the part that hits the center of the diaphragm is made into a single circular net so as to
be rough. The blanket 13 is driven to press-contact the two cylinders 7.8 via the roller 12. Then,
a diaphragm sheet 14 having a two-layer thick main portion 15 as shown in FIG. 6 is formed on
the blanket 13, which is peeled off and cut into a sector as shown by a broken line in FIG. As
shown in FIG. 8, this is conically wound and attached, and a corrugation is formed on the edge to
form a diaphragm 16. As described above, according to the method for manufacturing a speaker
diaphragm of the present invention, a round mesh papermaking apparatus provided with two
cylinders uses a low-toughness and strong fiber as one material and the other material as it has a
freeness. Vibrator with high fiber. It is characterized in that a two-layered sheet obtained by
thickly dividing a portion corresponding to the central part of the sheet is cut into a fan shape,
formed into a conical shape, and then this is formed [111111] There is no way. The edge portion
is strong and flexible, and not only can increase compliance but also have high input resistance.
On the other hand, in the central portion of the diaphragm, the vibration propagation speed is
different. Since it is composed of two types of materials, it can be a dog of industrial value, such
as being able to significantly improve the deterioration of acoustic characteristics due to split
resonance and the like.
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