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An object of the present invention is to provide an inexpensive speaker diaphragm having light
weight and high bending rigidity. Conventionally, as a flat diaphragm for a speaker, one having
an organic polymer foam as a core material and having a surface with a high elastic modulus
facing on the surface of the core material, or a core, such as a nickel core or a feather core A
diaphragm in which a surface material of high elastic modulus is provided on the surface of the
core material is used. In the above-mentioned conventional flat diaphragm made of foam, it is
possible to use a foam obtained in a cone shape to obtain rigidity or a method of obtaining
rigidity by relatively reducing the expansion ratio, but it is important to use it l There is a
drawback that it becomes smaller and less efficient when used as a speaker. -In the case of using
a foam with a high blade expansion rate, the cell strength of the foam is weak, and even if the
surface wrinkles are firmly bonded, cell breakage occurs and the surface material is peeled off 1,
reducing one surface force There is a problem with long-term reliability / no problem, and this
book solves the above-mentioned conventional defects and provides a light-weight, high-stiffness
speaker diaphragm and a core with high expansion ratio. Material is used to form a plurality of
holes in the thickness direction, and the adhesive also enters the pores. ": The adhesive is applied
to the core material, and the surface material is applied to the surface of the core material. It
adheres. B. J-Polymer As a material having a relatively high specific elastic modulus and a high
bending rigidity in the envelope, thermoplastic materials are available (d polystyrene,
polyacrylate size: these copolymers are available) For thermosetting materials, phenol, urea,
epoxy, polyurethane, etc. can be used 1]. However, in order to reduce the weight, it is necessary
to increase the expansion ratio as much as possible. When the expansion ratio is increased, the
cell strength rapidly decreases in inverse proportion to the expansion ratio. Even if the surface
phase is firmly bonded to such a core material, the surface is often peeled off by cell breakage of
the matrix core material. The present invention eliminates the above-mentioned conventional
defects, increases the adhesion strength of the surface material to the core material, improves the
strength as the diaphragm, and greatly improves the input resistance as the speaker. An
embodiment of the present invention will be described in comparison with a conventional train.
[Conventional Example] FIG. 1 shows a conventional speaker diaphragm. In FIG. 2, 1 is a core
material, and this core material 1 is made of a polystyrene foam having closed cells with an
expansion ratio of 50 times, and has a disk shape having a thickness of O mm and a diameter of
2 ocrn. 2, 2 'is a surface material adhered to the surface of the above-mentioned core material 1
with an adhesive 3, 3' which is an acrylic cocopolymer or C], and this surface material 2, 2 'is an
aluminum foil of 50 μm thickness .
The adhesive layer thickness of the adhesive 3.3 ′ is about 60 μ. In the first embodiment, the
coil bobbins 41 d and 19111111 are wound, and the coil bobbins 4 are bonded to the center of
the lower surface of the diaphragm with an Evoquin resin adhesive. 5はボイスコイルである。
[Example 1] The same material as the above-mentioned conventional example, core material 1
having the same shape, that is, a disc having a thickness of 7.0 m and a diameter of 20 cm and
made of polystyrene foam having an expansion ratio of 60 times, is shown in FIG. In the second
place, two regular holes penetrating pores 6 are formed in the thickness direction on the entire
surface of the core 1 at three familiar intervals. An adhesive 3. 3 ′ made of an acrylic copolymer
resin solution is applied to the surface of the core 1 on which a large number of pores 6 are
formed. In this case, the adhesive 3,3 'also enters the pore 6, and the adhesive 3,3' is also
attached to the wall of the pore 6 +1. The adhesive 3, 3 'is applied and heated immediately or
after an elapse of a predetermined time, the surface material 2, 2' made of an aluminum foil
having a thickness of 50 microns is adhered to form a diaphragm. Example 2 As shown in FIGS.
3A, 3B, 3C, and 3D, pores 7 which do not penetrate are formed at an interval of 3 mm on the
entire surface on one side of the core material 1. , 2 and 3 'are bonded to the surface of the core
material 1 by 3 and 3' to form a diaphragm. The following table shows the above conventional
example, Example 1. Example 20 The peeling strength of the surface materials 2 and 2 '(use of
the sample of width 15-) and the result of performing the tensile strength test by fixing the coil
bobbin 4 to each diaphragm and chucking the coil bobbin 4 are shown. There is. As apparent
from the above-mentioned table, in the present invention, the adhesive also enters the + 1 + 111
hole, and the adhesion area of the adhesive 3, 3 'increases, so the surface material 2, 2' from the
core material 1 Even if the strength of the dispute a is large and the coil bobbin 4 is pulled by
1/1 in the conventional example, 2800 y in Table 1m14'A '2, 2' scrap 1 jf I fc (DK, according to
Examples 1 and 2) For example, peeling of the surface 4'A2r '' does not occur and the diaphragm
is broken at 70001. FIGS. 4 and 5Q show another embodiment of the present invention; γ is
formed on the entire surface of the core 1 and locally formed on the portion to which the coil
bobbin 4 is bonded, to increase the strength of this portion. The present invention is configured
as described above, and according to the present invention, the adhesive strength of the surface
material to the core material made of foam is increased, the strength as the diaphragm is
improved, and when it is silked in the speaker It has the advantage that the input is greatly
improved and the reliability in long-term use is improved. The present invention is not limited to
the side of the solid line, but can be applied to a diaphragm of any shape such as a rectangle or a
Brief description of the drawings
Fig.1 phase A: top view of core of conventional diaphragm for speaker, Fig.1 B is the same cross
sectional view, Fig.1C is the cross sectional view of the same diaphragm, and the first plan is the
same diaphragm for the coil bobbin 2A is a top view of the core of the speaker diaphragm in one
embodiment of the present invention, FIG. 2B is the same sectional view, and FIG. 2C is the
sectional view of the same diaphragm. The second view is a cross-sectional view of a state in
which a coil bobbin is adhered to the same diaphragm / this state, FIG. 3A is a top view of a
material according to another embodiment of the present invention, FIG. 3B is a cross-sectional
view of FIG. C is a cross-sectional view of the same diaphragm, the third view is a cross-sectional
view of a state in which a coil bobbin is bonded to the same diaphragm, and FIGS.
1 · · · Core material, 2, 2 '... i ... Surface material, 3, 3' ... Adhesive, 4 ... ... Coil bobbin, 6 ... ... Voice
coil, 6.7 ・ ・ ・ ・ ・ pores. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1
Figure 2 Figure 3