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JPS5545211

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DESCRIPTION JPS5545211
1. Filled in the concave part of the diaphragm of the diaphragm and the diaphragm, it is filled
with a foam resin consisting of open cells, and it is adhered to the diaphragm so that a part or all
of the acoustic radiation surface is formed of the foam resin. Loud diaphragm for speakers.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a diaphragm of a
speaker. As a conventional solid diaphragm, the concave portion of the speaker diaphragm is
filled with a foamed resin (non-air-permeable foam) consisting of independent cells, and is fixed
to the diaphragm, and a part or all of the acoustic radiation surface is the concave portion of the
diaphragm. Or a foam resin (open air foam) made of open cells instead of a foam resin made of
closed cells, and a foam resin made of open cells close to the acoustic emission surface There are
those in which a skin layer is formed on the surface of the surface of the substrate, metal foil,
paper or the like is adhered to form an acoustic radiation surface, or both of them are used in
combination. Hereinafter, the non-air-permeable foam will be referred to as a foam resin
consisting of closed cells, and the air-permeable foam as a foam resin consisting of open cells.
However, when this conventional method uses a foamed resin consisting of closed cells, the
foamed resin consisting of closed cells forms closed cells, for example, when the density is as low
as dense Kp = 0.03 # / 7. The film thickness of the resin becomes thin, and the film expands and
contracts with the temperature change of the gas being irradiated in the closed cells, and the
closed cells themselves can not resist the contraction force and expand and contract along with
the expansion and contraction of the gas. The expansion of the closed cell, the contraction, ie the
expansion and contraction of the foamed resin consisting of the closed cell filled in the concave
portion of the vibrating plate, causes the deformation of the vibrating plate, the peeling between
the vibrating plate and the foamed resin, and the breakage of the foamed resin. There is. Next, for
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example, it consists of relatively high density closed cells such as dense Kl = 0.101 / cr / l? When
YI2 resin is used, the film thickness of the resin forming the closed cell is thicker than in the case
of low density, and expansion and contraction with temperature change of the gas sealed in the
closed cell EndPage: 1 Overcoming the force, the rate of expansion and contraction of the closed
cells themselves becomes very small with expansion and contraction of the gas, and the
expansion and contraction of the resin itself due to the change in temperature become most.
Although this eliminates the disadvantage of the destruction of the foamed resin due to
temperature change, as in the case of using a foamed resin having low density of isolated cells,
the rigidity of the foamed resin is further lowered by the fact that the density is still less There is
a drawback that the diaphragm can not resist the expansion and contraction of the foamed resin
due to the temperature change, and deformation of the diaphragm and peeling between the
diaphragm and the foamed resin occur. A further serious drawback is that the diaphragm is
heavy due to its high density, and it is not suitable for practical use. When a foam resin
consisting of open cells is used instead of a foam resin consisting of closed cells, a surfaceskinned skin layer of the foam resin consisting of open cells close to the acoustic radiation
surface is formed, or a metal foil or paper is adhered. An acoustic emission surface is formed, but
since the acoustic emission surface is formed of a thin film, the acoustic emission surface
resonates and there is a drawback that the output sound pressure frequency characteristic of the
speaker ((peak, noise is generated.
In the case where the foamed resin composed of closed cells and the foamed resin composed of
open cells are used in combination, both of the above-mentioned drawbacks are mixed. It is an
object of the present invention to obviate the disadvantages of the prior art described above and
to provide a lightweight, rigid and rigid diaphragm. The feature of the present invention is that a
foamed resin consisting of open cells is used as a material for filling the vJ plate concave portion,
and the acoustic emission surface formed of the foamed resin is made to be open cells.
Hereinafter, the present invention will be specifically described according to an embodiment
shown in the drawings. What is shown in the figure is an embodiment according to the present
invention applied to a 30c IIL speaker. In the figure, 1 is a frame, 2 is a yoke, 3 is a magnet, 4 is a
pole piece, 5 is a voice coil, 6 is a spider, 7 is a diaphragm, 8 is an edge, and 9 is adhesive to the
diaphragm 7. A foamed resin consisting of open cells is used, for example, a hard urethane foam,
having a mass of about 10 g, an @ degree of 0.015% d, and 10 и 3 иии is an acoustic emission
surface. The acoustic radiation surface 10 shows the surface of the foamed resin consisting of
open cells when the recess of the diaphragm 7 is filled with the foamed resin 9 consisting of
open cells having adhesiveness between the diaphragm 7 and the diaphragm 7, and there is no
skin layer etc. It is an open cell surface. The acoustic radiation surface 10 is formed by foaming
the foamed resin 9 in the concave portion of the diaphragm 7 and bonding the foamed resin 9 to
the diaphragm 7 and cutting off unnecessary portions. As shown in this embodiment, the foamed
resin 9 consisting of open cells having adhesiveness with the diaphragm 7 is filled in the entire
recess of the diaphragm and the acoustic radiation surface 10 is flat in terms of acoustic
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characteristics Although it is preferable, good characteristics can be obtained by filling a part of
the recess of the diaphragm. At that time, the acoustic radiation surface 10 may not necessarily
be flat. In the present invention, since the foamed resin consisting of open cells is used as the
material for filling the concave portions of the diaphragm, the closed cells are used as in the case
of using the foamed resin consisting of closed cells as in the conventional solid diaphragm. There
is no expansion or contraction of the foamed resin due to expansion or contraction due to
temperature change of the refuse inside, and since it is open cells, the rigidity of the foamed resin
is low compared to closed cells, flexibility is high, and expansion due to temperature change of
the resin itself Even when the diaphragm is shrunk, the diaphragm is not spread, and
deformation of the diaphragm, peeling between the diaphragm and the foamed resin, breakage of
the foamed resin, and the like can be prevented. A foamed resin composed of open cells can be
made lower in density than a foamed resin made of closed cells, and is currently marketed to a
density of p = 0.0061 / di. This reduction in density is essential in providing a light, full-sized
vibration plate.
Looking only at the point of rigidity of the foamed resin itself, in general, in the foamed resin of
the same density, the foamed resin composed of closed cells has higher rigidity than the foamed
resin composed of open cells. However, from the point of view of the rigidity of the diaphragm,
the rigidity of the diaphragm is sufficient if axial non-symmetrical vibration in the low region and
split resonance in the high region can be prevented. It is experimentally confirmed that the
rigidity of EndPage: 2 is necessary and sufficient even if a foam resin with open cells whose
rigidity is lower than that of foam resin consisting of closed cells is used as a filler to be filled in
the recess. ing. Furthermore, according to the present invention, a foam resin made of open cells
is used as a filler for the diaphragm recess, which is a conventional example, and a skin layer is
formed on the surface of the foam resin made of open cells close to the acoustic radiation
surface. The skin layer, metal foil, paper, etc. are removed from the one where the metal foil,
paper, etc. are adhered to form the sound emission surface, and the sound emission surface is
made into continuous cells, but the skin used in the conventional example The main purpose of
the sound emission surface such as layers, metal foils, and paper is to block the flow of air in the
recess of the diaphragm bounded by the sound emission surface and the air in the free sound
field space, with the aim of improving the rigidity of the diaphragm. And does not contribute
much to the improvement of the rigidity of the diaphragm. Therefore, the rigidity of the
diaphragm is not impaired even if the acoustic radiation surface is formed of a foamed resin
consisting of open cells as in the present invention. In the conventional solid diaphragm, the
acoustic radiation surface or the vicinity thereof is formed of the foamed resin or the skin layer,
metal foil, paper, etc. consisting of independent cells. The main purpose of this is the boundary of
the acoustic radiation surface as described above. The disturbance of the frequency characteristic
could be prevented by the flow interruption between the air in the concave portion of the
diaphragm and the air in the white space of the white space. In the present invention, since the
filler in the recess of the diaphragm and the acoustic radiation surface are formed of a foamed
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resin consisting of continuous cells, in terms of physical properties, air in the recess of the
diaphragm bounded by the acoustic radiation surface and free space Distribution of air. However,
since this continuous bubble is formed by very thin broken bubbles intertwiningly intricately
with each other, the acoustic impedance is very excellent, and the flow of the air can be almost
neglected acoustically, and the acoustic emission surface is more than a closed bubble It is
almost equivalent to that formed of a foamed resin or a skin layer, metal foil, paper or the like,
and a flat one with substantially the same frequency characteristics can be obtained. Further,
compared with the one in which the thin film is formed on the acoustic emission surface using
the foamed resin consisting of open cells instead of the foamed resin consisting of closed cells,
the thin film of the skin layer, metal foil and paper cylinder is not formed on the acoustic
emission surface Since the thin film forming the acoustic emission surface resonates by setting it
as an acoustic emission surface as a bubble, the output sound pressure frequency characteristics
do not have peaks and tips, and the extremely flat output sound pressure frequency
characteristics are obtained. You can get it.
4 is a cross-sectional view showing an embodiment of a speaker using a solid diaphragm
according to the present invention, a simple explanatory view of the drawings. DESCRIPTION OF
SYMBOLS 1 ... flame | frame 7 ... vibration iJ ++ board, 8 ... edge, 9 ... foam resin, 10 ... acoustic
radiation surface. Attorney Attorney Attorney 1) Toshiyuki EndPage: ?
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