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JPH03150000

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DESCRIPTION JPH03150000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a diaphragm used in an electroacoustic transducer or the like.
(Conventional art) Conventionally, a diaphragm made mainly of natural fibers has been formed
and processed from wood pulp. It occupies the main flow of the diaphragm because it is
lightweight and inexpensive. However, natural fibers are difficult to obtain sufficient
waterproofness because of their properties, and even if they are made waterproof using chemical
fibers etc., they are breathable and completely waterproof because they are made from paper. I
could not. In addition, there is a drawback that the weight reduction can not be made to a certain
extent or more. In order to solve these drawbacks, various laminated cones in which a
thermoplastic resin film 5 is bonded to the surface of a diaphragm have been proposed. The
laminated cone adheres a thermoplastic synthetic resin film softened by heating to a diaphragm
substrate made of natural fibers by suction, and heats the film to a temperature above its melting
point to fuse it to the diaphragm substrate. It was As a result, although depending on the
properties of the film, a smooth and smooth surface is generally obtained, and adhesion is
achieved by using an adhesive in bonding to other parts such as voice coil and dust cap. There
was something to lose. In addition, there is also an opinion that when the user listens to music
etc. because they have a gloss on the surface of the diaphragm they are not comfortable. In order
to solve these problems in recent years, a diaphragm base is provided with a surface layer by
printing etc. in advance. There have been proposed a method of attaching to a material, a method
of providing a surface layer by coating or the like after lamination, and the like. (Section M to be
Solved by the Invention) However, in any of the above-mentioned methods, the adhesion between
the film layer and the post-processed surface layer has many problems, and in particular, the film
printed by the former method It is necessary to heat-mold the sheet, which significantly impairs
the quality. In the latter method, variation due to painting is added and uniform appearance can
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not be obtained in production, and weight control problems that are considered important as
diaphragms also occur. There was a drawback. The present invention has been made in view of
the above-described circumstances, and the object of the present invention is to provide a
method of manufacturing a diaphragm having adhesiveness with other parts, quality stability of
the diaphragm, and settled appearance. It is (Means for Solving the Problems) The method for
producing a diaphragm according to the present invention for achieving the above object
comprises thermoplasticity on the surface of a diaphragm substrate mainly made of natural
fibers, chemical fibers, inorganic fibers, etc. A resin film layer is provided, a sheet having an
arbitrary surface roughness is placed on the surface of the thermoplastic resin film layer, and the
surface roughness of the sheet is transferred by heat and pressure onto the surface of the
thermoplastic resin film layer. It is characterized in that.
(Function) In the method of manufacturing the diaphragm of the present invention, the
thermoplastic resin film is heat-pressed with the sheet having an arbitrary surface roughness on
the surface of the thermoplastic resin film layer provided on the surface of the diaphragm. The
surface of the layer is softened and pressed against the sheet to transfer the surface roughness,
thereby improving the adhesion, quality stability, and settled appearance of other parts.
(Embodiment) An embodiment of the present invention will be described in detail below with
reference to FIGS. In FIG. 1, l is a diaphragm substrate. The vibration base material l is made of
100% wood pulp and is a speaker cone which is press-formed into a predetermined shape in
advance. The film layer 2 is fused on the surface of the diaphragm substrate l. For example, this
film layer 2 is made black by mixing a carbon pigment by about 2% by weight ratio with TX8030
(111 point 95 ░ C., softening point 68 ░ C.) manufactured by Sumika GE-DF Co., Ltd. Are
extruded and formed into a film of about 50 # thickness. The film layer 2 is heated to about
80.degree. C. and mounted on the diaphragm substrate l, suctioned and pressure-bonded by a
vacuum pump or the like, and heating is continued to raise the film temperature to about
140.degree. After fusing the film layer 2 to the diaphragm substrate 1 and cooling it, the socalled laminated diaphragm 3 is formed. Next, the laminate diaphragm 3 is set in a mold
consisting of an upper mold 4 and a lower mold 5 divided up and down as shown in FIG. Heaters
6 and 7 for heating the mold are respectively provided on the outside of the mold, and heat from
a heat source provided separately is applied to heat the mold to a predetermined temperature. In
these molds, the upper mold 4 is a male mold, and an elastic material 8 is provided in a portion
in contact with the surface side of the diaphragm, and when the upper mold 4 is pressed against
the lower mold 5 the surface of the diaphragm It works to hold down the side. The lower mold 5
is a female mold and is adapted to support the lower surface side of the diaphragm without a
gap. The laminate diaphragm 3 is set in the mold, and the transfer sheet 9 is placed on the
surface side of the thermoplastic resin film layer 2. The transfer sheet 9 is, for example, a
polyurethane elastomer sheet Nismar URS (a melting point of 150.degree. C., a softening point of
120.degree. C.) manufactured by the trade name Nippon Matai, which is formed in advance in
substantially the same shape as the diaphragm substrate l. . In addition, various synthetic resin
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films, foam materials such as foamed polyurethane, woven fabrics, non-woven fabrics, etc. may
be formed. Since the transfer sheet 9 is provided with a constant surface roughness at the time of
sheet production, This surface roughness can be used as it is.
The laminated diaphragm 3 on which such a transfer sheet 9 is placed is placed between the
molds 4 and 5. At this time, the upper and lower molds 4.5 are already heated to 100 ░ C. by
the heaters 6 and 7 provided in this mold, and this temperature softens the film layer 2 of the
laminate diaphragm 3, The temperature is sufficient to transfer the surface roughness of the
transfer sheet 90. In this state, when the upper mold 4 is lowered and pressed for 20 seconds
under a pressure of 300 kg, the surface of the film layer 2 follows the surface roughness of the
transfer sheet 9 combined with the action of the elastic material 8 of the upper mold 4 It is
closely transcribed as shown in FIG. After the transfer process is completed, separate the upper
mold 4 and the lower mold 5 from each other, take out the laminate diaphragm 3 and the
transfer sheet 9 as they are integrated, and leave them in the air for about 5 seconds to cool
them. As shown in FIG. 4, the transfer sheet 9 and the film layer 2 are easily separated by pulling
up one end of the transfer sheet 9 so that the surface roughness of the transfer sheet 9 is on the
film layer 2. The transfer is completed to complete the diaphragm. It should be noted that the
transfer sheet 9 can be used repeatedly, and about 100 sheets of samples were obtained, but no
change in appearance and performance due to sheet deterioration occurred. The surface of the
diaphragm thus obtained has an appropriate surface roughness, is excellent in adhesion to other
parts, has a well-defined appearance, and is an original laminate. It is possible to keep the
waterproofness and the ventilation of the cone. In the above embodiment, after the diaphragm
base 1 and the film layer 2 are fused, the transfer sheet 9 is placed again for heat transfer, but
the diaphragm base 1, the film layer 2 and the transfer are used. It is also possible to superpose
the sheet 9 and to perform heat processing simultaneously. As shown in FIG. 5, the edge portion
10 is separately attached to the diaphragm thus obtained, and the diaphragm is used as a freeedge diaphragm. Further, as shown in FIG. 6, the present invention can be applied to a
diaphragm of a fix edge. Furthermore, as shown in FIG. 7, although it is applicable also to a
center cap, although there is no merit in adhesion | attachment with other parts in this case, the
speaker which has a sense of appearance can be comprised. (Effects of the Invention) As
described above in detail, in the method of producing a diaphragm according to the present
invention, a thermoplastic resin film layer is formed on the surface of a diaphragm substrate
mainly made of natural fibers, chemical fibers, inorganic fibers or the like. Because the sheet
having an arbitrary surface roughness is placed on the surface of the thermoplastic resin film
layer, and the surface roughness of the sheet is transferred by heat and pressure onto the surface
of the thermoplastic resin film layer. The simple structure of only two layers with the diaphragm
base film layer has an advantage that the surface roughness is arbitrarily given to improve the
adhesion to other parts and improve the settled appearance and the quality stability. , There is an
advantage that will be of high industrial value.
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[0002]
Brief description of the drawings
[0003]
1 is a half cut sectional view of a laminated diaphragm, FIG. 2 is a half cut sectional view of a
diaphragm showing a transfer process, FIG. 3 is a sectional view of an essential part of a
diaphragm showing a transfer state, and FIG. 5 is a half-cut sectional view of the free-edge
diaphragm, FIG. 6 is a half-cut sectional view of the fixed-edge diaphragm, and FIG. 7 is a crosssectional view of the center cap.
1 иии Diaphragm base material 2 иии Film layer 4 и и и Upper mold 5 и и и Lower mold 9 и и и Transfer
sheet patent applicant Foster Electric Co., Ltd. Fig. 1 Fig. 2 Fig. 1. Figure 3 Figure 5 Figure 7
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