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JPH06197397

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DESCRIPTION JPH06197397
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker which is used continuously in an atmosphere as high as, for example, 150.degree.
[0002]
2. Description of the Related Art FIG. 3 is a cross-sectional view showing a part of a conventional
speaker disclosed in, for example, Japanese Utility Model Publication No. 58-4398. In the figure,
1 is a magnetic circuit, 2 is a center pole, 3 is a 3 A lower plate integral with the center pole 2, a
ring-shaped magnet 4, and an upper plate 5, the members from the center pole 2 to the upper
plate 5 constitute the magnetic circuit 1.
[0003]
Further, 6 is a frame attached to the upper plate 5, 7 is a gasket for fixing the edge to the
peripheral edge of the frame 6, 8 is a diaphragm in the shape of a cone, 9 is the above-mentioned
brake agent of silicone rubber adhesive applied The edge is connected to the outer periphery of
the diaphragm 8.
10 is a cylindrical voice coil connected to the inner periphery of the diaphragm 8, 11 is a damper
connected between the voice coil 10 and the frame 6, 12 is a magnetic gap into which the voice
coil 12 is inserted, 13 is dust It is a cap.
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[0004]
Next, the operation will be described. First, as the silicone rubber-based pressure-sensitive
adhesive, as an example, 85 to 90% of chain-form horganopolysiloxane as a base compound and
3 to 7% of ketooximexil silane as a cross-linking agent, with 5% as a standard; The silica filler is
used at a ratio of 5 to 10%, and the elongation percentage is 300 to 400%, and maintains
physical properties within a temperature range of 180 ° C to 55 ° C for ten years.
[0005]
Thus, the edge 9 which has been treated with a silicone rubber adhesive is excellent in weather
resistance, cold resistance, heat resistance and water resistance, and most of its quality and
characteristics are exposed to sunlight, ozone, wind snow, seawater and heat for a long time The
elasticity is semipermanent, even with no change, even against repeated distortions due to the
amplitude of the edge 9.
[0006]
Further, in such a speaker, the voice coil in the magnetic circuit is vibrated (reciprocated) in
accordance with the audio current, whereby a sound corresponding to the vibration is generated
on the diaphragm 8.
[0007]
Since the conventional speaker is configured as described above, the silicone rubber adhesive
applied to the edge 9 maintains the desired physical characteristics even in the atmosphere at
150 ° C. Since the base material of the edge 9 is a fabric molded product and is generally
formed by impregnating cotton with phenol, the desired physical characteristics are maintained
for a long time in an atmosphere at 150 ° C. It is difficult to do so, and the heat resistance of the
edge 9 as a whole is poor.
[0008]
The invention according to claim 1 is made to solve the above-mentioned problems, and it is
possible to obtain a speaker capable of performing stable operation over a long period of time
even in a 150 ° C. high temperature atmosphere and maintaining desired physical
characteristics. The purpose is
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[0009]
Another object of the present invention is to obtain a speaker capable of forming an edge having
high strength against tearing force and the like.
[0010]
A speaker according to the invention of claim 1 forms a ring-shaped edge as a molding of
millable silicon rubber, and an anodized film aluminum or titanium is formed on the inner
periphery of this edge. The formed diaphragm is integrally bonded at the time of forming the
edge.
[0011]
In the speaker according to the second aspect of the present invention, a heat-resistant fiber is
embedded in a ring-shaped edge formed as a molded article of millable silicon rubber.
[0012]
In the speaker according to the first aspect of the present invention, since the edge itself is a
molded article of millable type silicone rubber, it can be made to be excellent in heat resistance,
so that desired physical characteristics can be maintained over a long period of time Since the
molding of the edge and the bonding with the diaphragm are simultaneously performed at the
time of molding the edge, the adhesive necessary for bonding becomes unnecessary, the weight
of the diaphragm and the edge becomes lighter, and the input and output of the audio signal
Improve the characteristics and frequency characteristics.
[0013]
In the speaker according to the second aspect of the present invention, the heat-resistant fiber is
embedded in the edge as a base material, so that the machine of the edge is resistant to an
external force such as tearing force as compared with the case of only a milled silicone rubber
molding. Increase the target strength.
[0014]
EXAMPLES Example 1
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Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
In FIG. 1, 14 is an anodized aluminum or titanium diaphragm, 15 is a millable silicone rubber
edge, 16 is a primer applied to the bonding surface of the diaphragm 14 to the millable silicone
rubber edge 15, 6 is a frame 7 is a gasket.
Although the other peripheral structure is not shown, it is basically the same as that shown in
FIG.
[0015]
Next, the operation will be described.
First, the millable silicon rubber edge 15 is bonded to the anodized aluminum or titanium
diaphragm 14 simultaneously with the edge molding.
A primer 16 is applied to the bonding portion of the diaphragm 14 in order to strengthen
bonding of the millable silicon rubber edge 15.
In this bonding, since the viscosity itself of the millable silicone rubber is used as a bonding force,
no adhesive is required.
[0016]
Also, the anodized aluminum or titanium diaphragm 14 and the millable silicone rubber have
excellent heat resistance, and even in an atmosphere at 150 ° C., expected physical
characteristics over a long period of time, for example, harmonic distortion according to the
speaker aperture. , Frequency modulation distortion, directivity characteristics, output voltage
frequency characteristics, output voltage level, etc. can be maintained.
[0017]
Furthermore, although an adhesive such as RTV rubber is required for adhesion of ordinary
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silicone rubber, the adhesive according to the present invention does not require an adhesive, so
that the weight of the vibration system can be reduced, and, of course, The anodized aluminum
or titanium diaphragm 14 can maintain stable physical properties even at a high temperature of
150.degree.
[0018]
Example 2
In the above embodiment, the edge 15 is made of a single material of millable silicone rubber,
but as shown in FIG. 2, a heat-resistant fiber such as glass cloth 17 is used as a substrate in the
millable silicone rubber. The edge 15A may be embedded and molded into a three-layer
structure, and in this case, mechanical force against external force such as tearing force can be
obtained while obtaining desired physical characteristics, compared to the case of millable silicon
rubber alone. A strong edge 15 can be obtained.
[0019]
As described above, according to the first aspect of the present invention, a ring-shaped edge is
formed as a molded article of millable silicon rubber, and the inner periphery of this edge is
formed of anodized aluminum or titanium. Since the formed diaphragm is configured to be
integrally bonded at the time of forming the edge, the diaphragm and the edge can maintain
stable physical characteristics even in an atmosphere as high as 150 ° C., and the efficiency is
long over a long period of time There is an effect that what can be practically used as a high
speaker can be obtained.
[0020]
According to the invention of claim 2, since the heat-resistant fiber is embedded in the ringshaped edge formed as the molding of the millable silicone rubber, compared to the case of the
millable silicone rubber alone. There is an effect that the mechanical strength against tearing
force and the like can be sufficiently increased while obtaining desired physical characteristics.
[0021]
Brief description of the drawings
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[0022]
1 is a cross-sectional view showing a partially cut away speaker according to an embodiment of
the invention of claim 1;
[0023]
2 is a cross-sectional view showing the edge of the speaker of the invention of FIG.
[0024]
3 is a cross-sectional view showing a part of the conventional speaker.
[0025]
Explanation of sign
[0026]
Reference Signs List 1 magnetic circuit 6 frame 10 voice coil 14 diaphragm 15 edge 17 heat
resistant fiber
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