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JPS62290297

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DESCRIPTION JPS62290297
[0001]
3. Field of the Invention The present invention relates to a flat diaphragm for a speaker, and
more particularly, it is excellent in dimensional stability and suitable physical properties as a
diaphragm of a speaker in characteristics such as internal friction. In the case of using the
provided lumber sheet as a flat diaphragm, in particular, it is intended to improve the impact
resistance of the lumber sheet. Conventionally, cone paper in which pulp is formed in a conical
shape has been widely used as a flat diaphragm of a speaker. The pulp has characteristics
suitable for the diaphragm in terms of internal friction and specific gravity, but is formed into a
cone shape due to lack of rigidity, so that not only the storage space becomes large but also the
hollow in the cone recess There is a problem that resonance occurs to disturb the frequency
characteristic. In order to solve the above-mentioned problem of the frequency characteristic, in
recent years, a plane diaphragm of honeycomb structure having a light metal such as aluminum,
a carbon fiber reinforced plastic, a glass fiber reinforced plastic, or the like as a core material is
also widely used. . In the case of the planar diaphragm of the honeycomb structure, although it
has flat frequency characteristics as compared with the above-mentioned cone paper, there is a
problem that adverse effects such as cell resonance are easily generated. In order to prevent the
occurrence of resonance, there is a problem that the structure is complicated and the
manufacturing cost is increased, and there is also a problem of high frequency distortion or
many. In order to solve the problems caused by conventionally used pulp cones and aluminum
honeycombs etc. added by the present applicant, the present applicant has first planed a flat
wood sheet having a grain surface or a grain surface appearing on the surface. Provided as a
diaphragm. (Japanese Patent Application No. 60-246908) This flat lumber thin plate has physical
properties suitable for a flat diaphragm of a speaker in characteristics such as dimensional
stability, internal friction, rigidity, etc., and further, it has an advantage of low manufacturing
cost. The However, since the thin wood plate is a thin plate having a thickness of about I to 3
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mm, it is weak against impact and has a problem of being easily broken. The purpose of the
present invention is to solve the above-mentioned problems and to improve the impact resistance
in the case where a thin wood plate is used as a flat diaphragm. The flat diaphragm for speakers
according to the present invention has a large strength and light weight honeycomb material
adhered to the back surface of a thin sheet of wood whose front surface is a mesh surface or a
grid surface, It is an object of the present invention to provide a flat diaphragm for a speaker
characterized in that the impact resistance is improved by sticking. Furthermore, in order to
improve the strength of the honeycomb material itself and to improve the impact resistance of
the flat diaphragm, a skin layer made of the same material as HANICA 14 was provided on the
other surface of the honeycomb material facing the wood thin plate bonding surface. It is an
object of the present invention to provide a flat diaphragm for a speaker, which is characterized
in that.
Furthermore, in order to prevent the occurrence of warping of the wood sheet itself and improve
the adhesion performance with the honeycomb material, the wood sheet is chemically modified
with hydroxyl groups such as acetylation, or the wood sheet is injected with synthetic resin. The
speaker flat diaphragm is provided. In addition, when using a thin plate of wood diaphragm for a
wall speaker or the like, it is characterized in that the honeycomb material is attached except for
the peripheral portion so that an edge can be attached to the peripheral portion of the thin wood
plate so that the diaphragm does not protrude. The speaker flat diaphragm is provided. In the
following, the invention will be explained in more detail by means of an embodiment shown in
the drawing. In the lumber speaker unit shown in FIG. 1, the ribbed diaphragm l has a structure
in which the honeycomb material 3 is attached to the back surface of the thin wood plate 2. The
skin 4 is attached to the back surface of the honeycomb material 3 and the edge material 5 is
adhered and fixed to the peripheral edge of the back surface of the thin wood plate 2, and the
edge material 5 is formed on the periphery of the square opening of the frame 6 It is attached to
the end face of 6a. The thin wood plate 2 is formed by making a grit material formed in a
rounded square with a thickness of 1 to 2 mm (I mm in the embodiment) and a length of 105
mm on each side revealing a grit surface on the surface. The wood sheet may be a single sheet or
a plywood, and the plywood is more rigid and less likely to be broken. In addition, it may replace
with a grain material and use a grain material and make the grain surface appear on the surface.
As the thin wood sheet 2, those having a specific gravity of 0.25 to 0.8, such as softwoods such
as Sitka spruce excellent in acoustic characteristics or hardwoods such as zelkova, are preferably
used. In addition, in order to prevent warpage from occurring in the thin wood sheet 2, when a
hydroxyl group such as acetylation is chemically treated to chemically modify the thin wood
board, no expansion or contraction due to humidity is caused, and no warpage is generated. . In
addition, if synthetic resin is injected into the thin wood sheet 2 and WPC treatment is performed
instead of the above-mentioned chemical modification, dimensional stability is improved, the
change in humidity is small, warpage does not occur, and the appearance is improved. There is
an advantage. In this WPC treatment, a wood sheet is placed in a pressure reducing /
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pressurizing apparatus, air in the sheet is removed by pressure reduction, and then plastics such
as polyester and polystyrene are injected under pressure, and the weight ratio of wood is 30 to
40%. It is preferable to impregnate the inside and cure. The honeycomb material 3 is adhered to
the back surface of the thin sheet of wood 2 with an adhesive at a distance of 1 to 2 mm from the
peripheral edge, that is, with the peripheral edge removed. As the honeycomb material 3, a
lightweight aluminum honeycomb having high strength is used, and its thickness is set to 3 to 5
mm.
It is to be noted that if the thickness of the honeycomb material is too thick (it is not preferable
because cell resonance occurs), and if it is too small, the above thickness is preferable because
the strength is not obtained. As the honeycomb material 2, a vapor honeycomb or an FRP
honeycomb may be used instead of the two-leg aluminum honeycomb. The skin 4 of the same
material is adhered to the back surface of the honeycomb material 3 with a cement, and when an
aluminum honeycomb is used, an aluminum skin is used. The skin 4 has the function of raising
the strength to some extent and maintaining the shape of the honeycomb material 3, but it does
not have to be provided. When the skin 4 is provided with an opening ul <<, generation of cell
resonance can be more effectively prevented. In the present embodiment, the back surface
peripheral edge of the thin wood plate 2 to which the honeycomb material 3 is not stuck so that
the flat diaphragm l does not protrude from the baffle plate 21 (referred to as a front baffle plate
or soundboard) 21 to the n surface. In this case, one end of the down type edge material 5 is
fixed with an adhesive. The down type edge material 5 has a shape in which a concave portion 5a
curved to the back surface side is formed as shown, and by sticking one end surface 5b
projecting to the front surface side to the back surface of the thin wood sheet 2, the concave
portion 5a is formed. It covers and hides the side of the honeycomb material 3. The other end
surface 5c protruding to the surface side of the edge material 5 is adhered and fixed to the end
surface of the flange 6a of the frame 6, and the tip end 21a of the pubful plate 21 abuts the
Franz 6a with the end surface 5c of the edge material 5 interposed therebetween. It arrange |
positions and arrange | positions the control surface (upper surface in FIG. 1) of the plane
diaphragm 1 backwardly from the front surface of the baffle board 21. As shown in FIG. When
the honeycomb material 3 is attached to the entire back surface of the thin wood plate 2, the
edge material 5 is attached to the back surface side of the honeycomb material 3, and in that
case, the side surface of the honeycomb material 3 is exposed. It is necessary to cover the side
surface of the honeycomb material 3 by using an up mold projecting to the side. However, when
the up-type edge material is used, the front surface of the baffle plate 21 recedes and the flat
diaphragm 1 protrudes from the pubful plate. Therefore, when used for a wall-mounted speaker
or the like, as in the present embodiment, the honeycomb material 3 is adhered to the back
surface except for the peripheral portion of the thin wood plate 2 and the town type edge
material 5 is attached to the peripheral portion preferable. The other configuration of the
speaker unit is the same as that of the prior art, and the ferrite magnet 10 is attached to the back
surface of the frame 6 by adhesion with the metal plate 11 and the bottom 12 and the plate 11
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and the ferrite magnet IO are attached. A gap is provided between the inner peripheral surfaces
of the holes + 1a and IOa bored at the center of the and the outer peripheral surface of the
hollow cylindrical portion + 2a projecting at the center of the bottom I2.
On the other hand, a square frame-shaped reinforcing ring I3 is adhered and fixed to the back
surface of the thin sheet of wood 2, and the mounting surface of the reinforcing ring 13 which
protrudes on the back surface side of the skin 4 and is refracted along the skin 4 The front end
face of the support 14 is adhered, and the coil winding frame I5 is adhered and fixed to the rear
end of the support I4. A voice coil I6 is attached to the rear end of the coil winding frame 15, and
the voice coil attached portion is inserted into the gap between the plate 11 and the magnet IO
and the bottom cylinder Qf <I 2 a. Further, two molding wires 18 for supplying an audio signal
are attached to the coil winding frame 15, and the tip of the molding wire I8 is connected to the
terminal 20. Also, a damper 17 made of cloth is interposed between the outer peripheral surface
of the coil winding frame and the inner peripheral surface of the frame 6. With the above
configuration, when an audio current signal flows from the molding wire 18 to the voice coil 16,
the voice coil 16 and the coil winding frame I5 are vibrated according to the signal, and the
support I4 and the reinforcing ring 13 are accompanied by the vibration. The flat diaphragm 1
vibrates through the through-hole, and a sound is generated from the n-plane of the diaphragm l.
As apparent from the explanation above, in the case of the flat diaphragm according to the
present invention, since the honeycomb material is attached to the back surface of the thin wood
sheet, the strength is improved and the impact resistance is increased and the crack is It is hard
to occur. And since it is a plane diaphragm, there is no air conditioning resonance like a pulp
cone, and even if it is the same plane diaphragm as an aluminum honeycomb, since-surface is a
porous material of wood, it is like an aluminum honeycomb Cell resonance does not occur, high
frequency distortion is small, and the acoustic characteristics are excellent. Furthermore, since
the flat diaphragm of the present invention utilizes the appearance of wood as a surface design, a
grain surface or a grain surface appears on the surface, and the speaker becomes a high-class
speaker utilizing wood wood grain. Also, since the honeycomb material is adhered except for the
peripheral edge of the thin sheet of wood, the use of the down type edge material has various
advantages such as that the flat diaphragm does not protrude from the pubful sheet It is.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a speaker unit provided with a flat diaphragm according to an
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embodiment of the present invention, and FIG. 2 is a plan view of FIG.
l иии Flat diaphragm 2 иии Wood sheet 3 и и Honeycomb material 4 и и Skin 5 и и и Edge material 6 и и и
Patent patent applicant Chubu Corn Manufacturing Co., Ltd. and others
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