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JPS5677197

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5677197
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show a part of a conventional
diaphragm, FIG. 1 is a plan view, and FIG. 3 to 6 show an embodiment of the present invention,
and FIG. 3 is a longitudinal sectional view of a speaker using the diaphragm according to the
present invention, FIG. 4 is a plan view, and FIG. FIG. 6 is a cross-sectional view of another
embodiment. In the figure, 5 is a diaphragm, 6 is a core member, 7 is a projection, 8 is an edge
portion, 9 is a voice coil, and 10 ° 11 is a skin material. The same reference numerals in the
drawings denote the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of the
diaphragm of a loudspeaker. As a characteristic required as a diaphragm of a speaker, it can be
mentioned that the specific elastic modulus B / j '(E: elastic modulus, P: density) is large and the
internal loss of appropriate variation is included. In order to satisfy these requirements, a
diaphragm of honeycomb structure has recently been used. このものに。 As shown in FIGS. 1
and 2, a thin plate of aluminum is used as a honeycomb core material (6), and a skin material
110111 formed into a thin plate shape from both sides [CFRP (carbon fiber reinforced plastic)
etc. It is pasted and the cross section is made in 3 layer structure, compared with the diaphragm
which made the wood cellulose fiber and made n, specific elastic modulus E // 5 to 10 times in
the internal loss, y estimate for internal loss It is possible to obtain a moving plate that has been
However, due to the structure of the honeycomb structure and the core material of the
diaphragm) 6), a large number of strip-like thin plates having a width in the thickness direction
of the imaging moving plate in (2) are bonded in a staggered manner. The sheet is stretched to
form a ridge-like shape as shown in FIG. 1, and this sheet is cut out by punching and finished into
a diaphragm shape of a speaker. Therefore, as shown in the drawing, the inner peripheral edge
for increasing the voice coil (9) comes in contact with the @ 1 surface of the thin plate of the core
material (6) and the end face of the skin material 11GIIII and the plane of the voice coil (9) There
is a problem that the N1 fl product is small and causes adhesion failure. Even if a material with
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good thermal conductivity such as aluminum is used for the core material (6) worn, the contact
area with the voice coil is small, the heat of the voice coil can not be dissipated, and the adhesive
is degraded due to the temperature rise of the voice coil. There was a defect that it was damaged.
This invention is intended to solve such a drawback and to provide a speaker diaphragm capable
of obtaining a speaker with a small increase in temperature even with a large input. An
embodiment of the present invention will be described below with reference to the drawings. In
FIG. 3 to FIG. 5, 111 is a speaker baud (3) ruby, 121 ti magne mounted on and fixed to the rim of
this hole piece, l 31 t! It is a plate mounted and fixed on a magnet (2) so that an inner peripheral
end is formed at a predetermined distance with the above-mentioned pole heath. The magnetic
circuit of the speaker is reduced by the pole piece (11, magnet 121.7 rate (3)). +4) Frame
attached to the above plate, (51 is the diaphragm of the speaker, 161tj This is the core material
of this diaphragm, it is a thin sheet of rtl foil with aluminum or aluminum alloy material. As
shown, there are a number of projections (7) having a flat surface and a flat surface at the tip,
and a voice coil bobbin and a surface on the inner periphery to which the voice coil (9) is
attached. An edge (8) is provided which is formed isomorphically to be in contact.
α [1, [111 is a skin material bonded with an adhesive on the tip flat portion and the bottom
surface of the protrusion (7) of the core material (6), which is a CFRPl carbon fiber reinforced
plastic) or HGFRPI glass fiber reinforced 7 'plastic) or the like is formed into a sheet. As described
above, the imaging plate (4) (5) of the speaker, the nicho material (6), and the skin material side
(II are released at 111). (9) The voice coil of the Hassby force, the core portion of the abovementioned speaker diaphragm (edge portion + 81 K formed on the surface 61 is fixed by an
adhesive. (A full pan α 3 is an edge and a spyter for holding the diaphragm plate of the above
speaker at the fixed position of the above magnetic circuit. Next, the operation of assembling the
diaphragm and the diaphragm of the speaker will be described. First, when the diaphragm is
completely manufactured, the core material (6) and the thin plate are formed by molding the
projection (7) and the edge (8) by a method such as pressing. In this way, the container 1 can be
easily manufactured from a flat plate by ordinary work. Next, the skin material αCJ [111 is
adhered with an adhesive, but the contact between the skin material and the core material is in a
flat surface, and the contact area is several dozen times to several times compared to the
conventional flat surface and end face contact of the core It can be as many as one hundred
times and sticking is done reliably. Attach the voice coil 19 to the moving plate (5), which has
been turned in this way, but at this time the voice coil (9) and the edge portion (8) of the core
material (6) of the diaphragm and the surface. Contact and (5) become several tens times to
several hundreds times as large as the contact between the end face of the conventional core
material and the voice coil plane, and a large contact area is obtained, and the voice coil
attachment in the adhesive is assured Can be assembled to almost completely prevent adhesion
failure. Next, when the diaphragm and the voice coil that are separated in this way are installed
in the speaker and can be operated, there is an input in the voice coil (9) and the diaphragm (5)
vibrates. When a large input is input, heat is generated in the voice coil (9), and the bond
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between the voice coil and the diaphragm is deteriorated due to the rise in temperature, resulting
in breakage. In this invention, the voice coil (9) and the diaphragm (5 The core material (6) is in
contact with the edge (8) of the core material (6), and the core material (6) is made of aluminum
or aluminum alloy, which has high thermal conductivity. Is transmitted to the core material (6)
having a wide table ifl product to dissipate heat, thereby suppressing the temperature rise of the
voice coil portion and making it possible to obtain a speaker without deterioration of the
adhesive even at the time of large input . In the above example, the core material (6) with its edge
+ 81 K (6)-voice coil (9) was completely fixed, but as shown at 6 @, the edge (8) was fully
stretched. .
Even if the voice coil (9) is wound at this edge-the effect of the quantity line? Of course it is
worth getting. As described above, the diaphragm of the speaker having a three-layer structure
according to the present invention comprises the voice coil, the diaphragm, the edge portion of
the core material formed of a material having high thermal conductivity, and the surface contact
to the surface contact. Therefore, it is possible that there is no adhesion failure and the like. Since
the heat dissipation of the voice coil is effectively performed, the speaker diaphragm can be
made free from damage due to temperature rise even at large input.
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