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JPS58103295

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DESCRIPTION JPS58103295
[0001]
The present invention relates to a method of manufacturing a speaker diaphragm, and an object
of the present invention is to provide a speaker diaphragm that can be easily manufactured and
has high rigidity. In general, most of the speaker diaphragms are formed by forming paper pulp,
and the shape is a cone type. Therefore, the position of the sound source is shifted between the
inner and outer peripheral portions of the speaker diaphragm to cause a phase difference, and a
speaker having a frequency characteristic of 7 [7] is difficult to obtain. On the other hand, a
temporary speaker with an F plate as the diaphragm and the same position of the sound source
does not have the front room effect seen in a cone type, and is advantageous for realizing
flattening of frequency characteristics. Therefore, a flat plate diaphragm having a sandwich
structure centering on an aluminum иииииииииииии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и flat
plate diaphragm of sandwich structure with an aluminum и и и и и и kami core that can be obtained
high rigidity and bending rigidity. However, the manufacturing process of the aluminum и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и manufacturing process is complicated, so
the cost of the aluminum и и и и и и и и и и и и ?? ?? stereo equipment, radio receiver 1 television
receiver 1 It is. In addition, in order to obtain a flat plate of a soot / doinochi structure at low
cost, a polymer resin film is prepared. All molding. There is a method of making a large number
of concavities and convexities by vacuum compression molding or the like, and forming a core
material as a diaphragm. It is heated pressure bonding using conventional adhesive bonding of ...
honeycomb-shaped core and the table counter material in the production. At this time, the cells
are independent from the outside ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 11 There is a drawback that the rigidity
is lowered, the high frequency limit frequency fh is increased, and the endogenous band is
narrowed. In order to prevent this phenomenon, in the case of the above-mentioned aluminum и и
и и nick, a hole or a groove is made in advance in the core laminated in advance, and it is
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expanded to form the core material of the diaphragm. And the cost was high. The present
invention solves the above-mentioned conventional drawbacks, and the film is formed by a
molding die having a concavo-convex pattern provided with a groove so that external air can
freely enter and leave each cell. It is a thing. At the same time as forming a core material with this
mold, small grooves can be formed, and a core material provided with an air vent can be formed
in one step. The diaphragm made of the core material thus formed by heating and pressure
bonding the surface material has -V slip on the surface, and has a high performance without
narrowing of the paleontaceous zone. Hereinafter, the embodiment will be described in more
detail. -'I For example / after vacuuming a polyarylate resin film (U Polymer ? Unitika,
manufactured by K, made by about 15071 m thick) to about 350'C to soften it, it is vacuum
molded by an uneven mold with narrow grooves. did.
At this time, the film 4 is transferred between the press die 2 containing the heater 1 and the
press upper die 3 as shown in FIG. 1, and the film 4 is heated by the heater 1. Softened. Further,
the concave portion 6 of the press upper die 3 is expanded in the radial direction to be arranged
in a cross direction and has uneven portions 6A, eB alternately arranged in the circumferential
direction, and the concave portion Projections 7A for the thin groove at the bottom of 6A and
depressions 7B of the groove of the thin groove at the F portion of the projection 6B in the radial
direction, and small holes 8 for suctioning air at the bottom of the recess 6A Place the uneven
molding die 9 and l: soften the film 4 by heating and then soften the film 4 from the air holes 2a
provided in the above-mentioned presto die 3 It air-released and it attracted | sucked to the said
shaping | molding die 9, and shape | molded. In this way, as shown in FIG. 2 and FIG. 3, they are
vacuum-formed and arranged alternately in the radial direction, and have irregularities 10A, 10B
arranged on the father U in the circumferential direction. It was eleven. In this case, as shown in
FIG. 4, each cell of the h-core 11 is formed with a groove 12 [[J 1 mm, depth 0.5 mm, and air is
removed at the time of bonding to the surface material. It plays a role. After that, an Al1 foil with
a thickness of 20 Itm was bonded as a surface material to the core material 11 with heat and
pressure using a polyamide-based film adhesive, to bond the core material 11 to a 80 mm
diameter, 3 mm thickness metal plate diaphragm. The frequency characteristic of the speaker at
this time is shown by the line a in FIG. Further, the frequency characteristics of the diaphragm 9
speaker having the same shape as that of the conventional one without the air vent groove are
shown in the curve of FIG. As can be seen from FIG. 5, it is understood that the upper limit
frequency fh is higher in the embodiment. Although in the above embodiment the core material
pattern of substantially square shape is used, the core material pattern is not limited to the shape
shown in the embodiment, and the grooves are similarly provided with triangles, hexagons, etc.
as shown in FIGS. Therefore, a sufficient effect can be obtained. The dimensions and dimensions
of the diaphragm may be similarly applied to smaller ones or smaller ones in addition to the
embodiment. As described above, according to the present invention, each cell provided in the
core material is connected to the outside air by the groove provided for each cell, and when the
core material and the surface material are heated and pressurized to bond, It is possible to
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eliminate the unevenness of the surface facing material caused by the low pitch, and it is possible
to obtain a high-performance diaphragm having higher rigidity than that of the unevenness.
Furthermore, since the forming die is provided with projections and depressions for the air vent
groove in advance, the core material can be vacuum molded and can be molded to the air vent
groove at the same time.
Therefore, the manufacturing cost is low and the present invention can be sufficiently applied to
widespread speakers.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a vacuum forming machine used in the method of manufacturing a
speaker diaphragm according to the present invention, and FIG. 2 is a top view of a core of the
speaker diaphragm obtained by the same molding machine, and FIG. 2 is a sectional view taken
along the line a-a 'of FIG. 2, and FIG. 4 is a perspective view with the main part cut away showing
another embodiment of the speaker diaphragm of the present invention.
41 heater, 2.3 pressing die, 2a hole, 4 film, 5 и recess, 6A recess, 6B и и и protrusion, 7A и и
protrusion, 7 B-recess, 8 и и small hole, 9 -Mold, 1 QA, 4 parts, 10 B convex part, 11-Core material,
12 grooves. Name of Agent Attorney Nakao Toshio and 1 other tl! ????? ??
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