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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a plan view, and FIG. 2 is an enlarged cross-sectional view of FIG. In the figure, 1 is a
diaphragm of a speaker, 2 is a core material, 3 is a protrusion, and 4 and 5 are skin materials. In
the drawings, the same reference numerals denote the same parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a speaker diaphragm. As a diaphragm for speakers l! The properties required are that the
specific elastic modulus E / ρ (E2 elastic modulus, -2 @ degree) is large and that it has an
internal loss of 31-(1) now 11M4. In order to satisfy these requirements, a honeycomb board
having a honeycomb structure has recently been used. This product is made of aluminum thin
plate as a core material of honeycomb, skin material made of 0FRPC (carbon fiber reinforced
plastic), etc. bonded on both sides, and cross section is made in three-layer groove: a, wood It is
possible to obtain an excellent diaphragm in which the specific modulus is 5 to 10 times the
internal loss and the internal loss is almost equal to that of a diaphragm made by forming a
cellulose fiber. But this honeycomb structure diaphragm. When the skin material is adhered to
both sides of the honeycomb core material with a bonding agent, the skin material contacts and
is in contact with the end face of the thin core material and a large contact area is not obtained
and adhesion failure occurs. The contact failure easily causes the speaker diaphragm to vibrate
and resonates at the contact failure portion, causing the skin and the core to collide with each
other to generate an abnormal sound, resulting in a fatal defect as a speaker. The present
invention is intended to provide a speaker diaphragm in which such a drawback is improved. An
embodiment of the present invention will be described below. In Fig. 1 and Fig. 2, (全体 shows
the entire speaker diaphragm, and when incorporated into the speaker, the outer peripheral end
is an edge (not shown) and the inner peripheral end is a voice coil (not shown) K adhesion is
added one. (2) A thin plate material such as aluminum is drawn to a plurality of projections
whose circular shape is circular by drawing or press forming such as vacuum forming (3) All
formed to have a uniform rl thickness t The core material of the speaker diaphragm, (4) and (5)
skin materials pasted with adhesive on the surface and the back of this core material, 0FRP
(carbon fiber reinforced plastic) or GFRP (glass fiber reinforced plastic) And the like in the form
of a sheet. The tip of the projection (3) is formed to be flat as shown in the drawing. As described
above, when the skin material (4) and the skin material (4) are laminated on the core material (2),
the skin material is joined in contact with the flat surface of the core material and the bonding
area is in proportion to the conventional core end face contact 'i4.i (31 f God: significantly more
than that, the adhesion strength between the core material (2) and the skin material (41 (5)) is
remarkably improved.
Further, the projections can maintain the specific elastic modulus E // equivalent to that of the
conventional honeycomb core. In addition, a space is created in a portion other than the
protruding portion of the core material, and the internal loss can be obtained similarly to the
honeycomb core. In addition, this speaker diaphragm can be used not only for the illustrated flat
plate sliding plate vc @ but also for a cone shape, and the protrusion shape is not limited to a
round shape, and may be formed into a triangle or a square. As described above, the speaker
diaphragm according to the present invention has a plurality of projections having a flat portion
at its tip end as a core material, and a skin material is fixed on both sides of the core material to
form a diaphragm. Therefore, both the specific elastic modulus E / ρ and the internal loss can
obtain good characteristics similar to those of the honeycomb structure diaphragm, and the
contact failure which is a defect of the conventional honeycomb structure diaphragm is one side
and one side As a result of the vibration, the 襞 IF direction area can be increased, and there is no
(4) failure of the heat contact layer due to practical strength, resulting in a good speaker
diaphragm without generation of abnormal sound and the like.
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